Patent Application
20240426030
This application claims the benefit of priority of Taiwan Patent Application No. 112122182, filed on Jun. 14, 2023, the disclosure of which is herein incorporated by reference in its entirety.
The invention is related to a method for preparing a polyester elastic conjugated yarn wherein a polyester fiber is used as a raw material to form a polyester yarn by a false twisting process, whereas a thermoplastic polyester elastomer (TPEE) is fed to form a thermoplastic polyester elastomer yarn by an unwinding process. The polyester yarn and the thermoplastic polyester elastomer yarn are simultaneously undergone a fiber blending process so as to constitute the polyester elastic conjugated yarn in combination. The invention further provides a polyester clastic conjugated yarn, and a yarn and a fabric comprising the polyester elastic conjugated yarn.
Polyester fibers, such as PET, are made by polymerizing the monomers of terephthalic acid and the monomers of ethylene glycol. Due to its excellent heat resistance and chemical stability, as well as its high mechanical strength, PET fibers are widely used as textile materials in apparel, home furnishings, and industrial applications. However, the disadvantages of PET are high modulus, high hardness, and its elastic recovery rate is far inferior to that of Nylon 66. In order to improve the poor elastic recovery rate, it has been proposed to polymerize 1,4-butanediol (1,4-BDO) monomer, 1,3-propanediol (1,3-BDO) monomer, and benzene dicarboxylic acid monomer during the polymerization process to produce PBT and PTT, respectively. The elasticity of the fiber produced by PBT and PTT is better than that produced by PET. However, the elasticity recovery rate of said the fiber is still insufficient.
In order to solve the problem of lacking elasticity, the industry generally adopts the conventional method which is to make a false-twister processed yarn from a polyester fiber, and followed by combining said yarn with Spandex (one kind of filament spun from polyurethane) by means of “yarn-wrapping”. Although the elastic recovery rate of such composite filament is excellent, it cannot be easily recycled because the two materials are different. Therefore, it has a great impact on the environment.
In order to solve the above-mentioned problem in the field, an objective of the present invention is to provide a method for preparing a polyester elastic conjugated yarn having stretch elasticity and elastic recovery. Said polyester elastic conjugated yarn can be used for producing a yarn and a fabric having stretch elasticity and elastic recovery and can be recycled easily to reduce the impact on the environment.
The present invention provides a method for preparing a polyester elastic conjugated yarn comprises: forming a polyester yarn by using a polyester fiber as a raw material through a false twisting process; forming a thermoplastic polyester elastomer yarn by using a thermoplastic polyester elastomer (TPEE) as a raw material through an unwinding process; and combining the polyester yarn and the thermoplastic polyester elastomer yarn in a fiber blending process to obtain the polyester elastic conjugated yarn.
In one embodiment, the polyester fiber is a polyethylene terephthalate (PET) fiber, a polybutylene terephthalate (PBT) fiber, a polytrimethylene terephthalate (PTT) fiber, a cationic-dyeable polyester (CD polyester) fiber or a recycled polyester fiber.
In one embodiment, the polyester fiber is a sheath-core (S/C) fiber, a segment pie fiber or a sea & islands (S/I) fiber.
In one embodiment, the thermoplastic polyester elastomer is a PBT type polyester elastomer.
In one embodiment, the thermoplastic polyester elastomer is prepared by a non-recycling process or a recycling process.
In one embodiment, the thermoplastic polyester elastomer is prepared by a mechanical recycling process or a chemical recycling process.
In one embodiment, the thermoplastic polyester elastomer yarn is monofilament or multifilament.
In one embodiment, the denier per filament (dpf) of the thermoplastic polyester elastomer yarn is below or equal to 100 Denier (De).
In one embodiment, the drawing ratio of the polyester yarn is different from that of the thermoplastic polyester elastomer yarn.
The present invention also provides a polyester elastic conjugated yarn comprising a polyester yarn and a thermoplastic polyester elastomer yarn, wherein the polyester yarn and the thermoplastic polyester elastomer yarn are separated but twist to each other.
In one embodiment, the polyester yarn is formed by a false twisting process using a polyester fiber as a raw material, the thermoplastic polyester elastomer yarn is formed by an unwinding process using a thermoplastic polyester elastomer (TPEE) as a raw material, and the polyester elastic conjugated yarn is obtained by combining the polyester yarn and the thermoplastic polyester elastomer yarn in a fiber blending process.
In one embodiment, the polyester fiber is a polyethylene terephthalate fiber, a polybutylene terephthalate fiber, a polytrimethylene terephthalate fiber, a cationic-dyeable polyester fiber or a recycled polyester fiber.
In one embodiment, the polyester fiber is a sheath-core fiber, a segment pie fiber or a sea & islands fiber.
In one embodiment, the thermoplastic polyester elastomer is a PBT-type polyester elastomer.
In one embodiment, the thermoplastic polyester elastomer is prepared by a non-recycling process or a recycling process.
In one embodiment, the thermoplastic polyester elastomer is prepared by a mechanical recycling process or a chemical recycling process.
In one embodiment, the thermoplastic polyester elastomer yarn is monofilament or multifilament.
In one embodiment, the denier per filament of the thermoplastic polyester elastomer yarn is below or equal to 100 Denier.
In one embodiment, the drawing ratio of the polyester yarn is different from that of the thermoplastic polyester elastomer yarn.
The present invention also provides a yarn comprising the above-mentioned polyester elastic conjugated yarn and other fibers.
The present invention further provides a fabric comprising the above-mentioned polyester elastic conjugated yarn or the above-mentioned yarn.
The polyester elastic conjugated yarn produced by the method of the present invention has an excellent stretch elasticity and an elastic recovery rate. The fabric produced by the polyester clastic conjugated yarn of the present invention by weaving, dyeing and finishing would also has an excellent stretch elasticity and an elastic recovery rate. In addition, both the polyester fiber and the thermoplastic polyester elastomer used in the preparation method of the present invention belong to a polymer of the polyester. Therefore, it can be recycled simultaneously and thus can reduce the cost of recycling and the impact on the environment.
The present invention provides a method for preparing a polyester elastic conjugated yarn to bestow the elasticity to the fabric. The method uses a polyester fiber as a raw material to form a polyester yarn by a false twisting process; uses a thermoplastic polyester elastomer (TPEE) as a raw material to form a thermoplastic polyester elastomer yarn by an unwinding process; and combine the polyester yarn and the thermoplastic polyester elastomer yarn in a fiber blending process to obtain the polyester elastic conjugated yarn.
The technical features of the present invention, including specific features, are disclosed in the claims. The examples and drawings of the present invention will now be described in more detail as following. In addition, the disclosure of the present specification can be understood and implemented by the person with ordinary skills in the art. All of the modifications or changes (not deviate from the concepts of the present invention) will be fully covered by the scope of the claims of the present invention.
Unless otherwise illustrated, all technologies and scientific terms used herein have the same meaning as general understanding of the person having ordinary skill in the art. As used in the description of the invention and the appended claims, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The use of the terms “or” and “and” in the specification is used to mean “and/or” unless explicitly indicated. In addition, the terms of “comprising”, “including”, “containing” are used as open-ended terms. The above-mentioned meanings are used for illustrating the definitions of the terms and should not be construed as limited to the subject matters of the present invention. Unless otherwise illustrated, the materials used in the disclosure are commercially available.
When any specific concentration or the concentration range is mentioned herein, it should be modified by the term of “about” in all the situations. The term “about” is used to indicate a value within the acceptable variation of a specific value. For instance, said acceptable variation partially depends on how the value is determined or measured by the person with ordinary skills in the art, i.e. the detection limit of a measuring device. Unless otherwise illustrated in the examples, other parts of the specification in a specific determination, results or embodiments, the term “about” is meant to encompass a standard deviation in the field or at most within 5% range, whichever is greater.
As used herein, the term “unwinding” refers to unfasten a round, a ball, a bundle or a roll of fibers.
Other aspects of the embodiments of the present invention will be described in more detail below. The embodiments of the present invention are provided for fuller and more complete disclosure of the present invention, and enable the person having ordinary skill in the art to understand and carry out the present invention and should not be construed as limited to the embodiments described in the present invention. However, it will be apparent to those of ordinary knowledge in the art that the invention may be practiced in other embodiments that depart from the particular details disclosed herein with the benefit of this disclosure. In addition, the description of familiar devices, methods, and materials may be omitted to avoid obscuring the description of the various principles of the present invention.
In the embodiment, the difference of the rotational speeds between the first roller 1 and the second roller 5 causes the fiber A (the polyester fiber) to form a polyester yarn having a first drawing ratio. For example, the rotational speed of the second roller 5 may be 400 to 700 m/min. Preferably, the rotational speed of the second roller 5 may be, for example but not limited to, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700 (or any value or range in between). The rotational speed of the first roller 1 may be 100 to 700 m/min. Preferably, the rotational speed of the first roller 1 may be, for example but not limited to, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700 (or any value or range in between). In particular, the rotational speed of the first roller 1 is usually lower than that of the second roller 5, such that the first drawing ratio is between 1 to 5. Preferably, the first drawing ratio may be, for example but not limited to, 1.0, 1.1, 1.2, 1.3, 1.4, 1.50, 1.55, 1.60, 1.65, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0 (or any value or range in between).
In the embodiment, the different rotational speeds between the zero roller 9 and the second roller 5 causes the fiber B (the thermoplastic polyester elastomer) to form a thermoplastic polyester elastomer yarn having a second drawing ratio. The rotational speed of the second roller 5 is described as above and omitted here. The rotational speed of the zero roller 9 may be 50 to 700 m/min, preferably 50 to 600 m/min, and more preferably 100 to 400 m/min. For instance, the rotational speed of the zero roller 9 may be, for example but not limited to, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700 (or any value or range in between). In particular, the rotational speed of the zero roller 9 is usually lower than that of the second roller 5 such that the second drawing ratio is between 1 to 6, preferably between 2 to 4. For instance, the second drawing ratio may be, for example but not limited to, 1.0, 1.1, 1.2, 1.3, 1.4, 1.50, 1.55, 1.60, 1.65, 1.7, 1.8, 1.9, 1.95, 2.0, 2.05, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 2.95, 3.0, 3.05, 3.1, 3.2, 3.3, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.8, 3.9, 3.95, 4.0, 4.05, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 4.95, 5.0, 5.05, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0 (or any value or range in between).
It should be illustrated that the rotational speed of the first roller 1 is different from that of the zero roller 9. Thus the first drawing ratio is different from the second drawing ratio to increase the elasticity of the polyester elastic conjugated yarn.
Subsequently, the polyester yarn and the thermoplastic polyester elastomer yarn enter into an air nozzle 6 at the same time. Both of them are blended and interlaced by the action of the air nozzle 6. They then passes through the third roller 7, and are wound into a polyester clastic conjugated yarn by the winder 8. For instance, the air pressure of the air nozzle 6 is between 2.0 to 4.0 Kg/Cm2, such as but not limited to, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0 (or any value or range in between).
In the foregoing processes, the temperature of the heater may be between 100° C. to 300° C., preferably between 100° C. to 220° C., and more preferably between 180° C. to 200° C. For instance, the temperature of the heater may be, for example but not limited to 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300 (or any value or range in between).
As used herein, polyester is a general term for the polymer produced by polycondensation of the polyalcohol and the polyacid. The term polyester generally refers to polyethylene terephthalate (PET) and other liner thermoplastic polymers, such as polybutylene terephthalate (PBT) or polytrimethylene terephthalate (PTT). Polyester is a class of engineering plastics with excellent properties and a wide range of applications and can be made into polyester fibers. In one embodiment, polyester fibers are continuous long-fiber filaments spun by conventional spinning method or composite spinning method in the synthetic fiber filed. Alternatively, the polyester fiber is a recycled polyester fiber obtained from a mechanical recycling process or a chemical recycling process common used in the synthetic fiber filed. For example, the long-fiber filament spun by conventional spinning method includes but not limited to a polyethylene terephthalate (PET) fiber, a polybutylene terephthalate (PBT) fiber, a polytrimethylene terephthalate (PTT) fiber, or a cationic-dyeable polyester (CD) fiber. The continuous long-fiber filament spun by composite spinning method may contain at least two components. Depending on the distribution of the components in the conjugated fiber, it can be classified as side by side fiber, sheath-core (S/C) fiber, segment pie fiber, or Sea & Islands (S/I) fiber. In a preferred embodiment, the continuous long-fiber filament spun by composite spinning method includes but not limited to sheath-core fiber, segment pie fiber or Sea & Islands fiber. In another preferred embodiment, the cross-section of the fiber may be a circular cross-section or a non-circular cross-section. The non-circular cross-section may be, for example but not limited to a cruciform cross-section, a triangular cross-section, a polygonal cross-section, a dumbbell cross-section, a Y-shape cross-section, a wavy straight line cross-section, a three-petal flower shape cross-section, a four-petal flower shape cross-section or other non-circular cross-sections commonly known by the person with ordinary skills in the art.
In the present disclosure, the thermoplastic polyester elastomer (TPEE) is generally produced from polymerization of terephthalic acid and 1,4-butanediol. Thermoplastic polyester elastomer is a kind of thermoplastic elastomer. The thermoplastic polyester elastomer (TPEE), also called co-polyether ester, is one kind of elastomer material. These materials have thermoplastic processing properties. They have elasticity and resilience, and are not prone to elastic fatigue. The above-mentioned properties come from the co-polymer consisting of crystallized polyether segment (also known as hard segment which can be polyarylate, such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT)) and amorphous polyester segment (also known as soft segment which can be polyether ester, such as polytetramethylene ether glycol (PTMEG)). The polyether and polyester segments copolymerize with each other and form a macromolecular block skeleton. After melt-cooling, the hard segments (e.g. PBT) automatically cluster to form hard crystalline regine connecting the elastic soft segments. The hard and soft segments form mechanical interlocking together and strong intermolecular force, but do not form a network of chemical interlinks. Hence, the polyester elastomer can be heated to the temperature above the melting point of the crystalline region (above about 200° C.) and then undergo other processes.
In a preferred embodiment, the hard segment of the thermoplastic polyester elastomer is polybutylene terephthalate (PBT). In a more preferred embodiment, the hard segment of the thermoplastic polyester elastomer is polybutylene terephthalate and the soft segment of the thermoplastic polyester elastomer is polyether ester, more preferably, the polyether ester is polytetramethylene ether glycol (PTMEG).
In one embodiment, the thermoplastic polyester elastomer (TPEE) is produced according to the below processes:
The meanings of the abbreviations are as below:
In another embodiment, the thermoplastic polyester elastomer (TPEE) is prepared by a non-recycling process or a recycling process. In a preferred embodiment, the thermoplastic polyester elastomer (TPEE) is prepared by a recycling process, such as but not limited to the thermoplastic polyester elastomer (TPEE) prepared by a mechanical recycling process or a chemical recycling process.
In the above embodiments, the fiber number of the thermoplastic polyester elastomer yarn prepared from the thermoplastic polyester elastomer may be monofilament or multifilament. In addition, the fiber number of the polyester yarn prepared from the polyester fiber may be monofilament or multifilament, preferably multifilament.
In the above embodiments, the thermoplastic polyester elastomer yarn may be used to produce long-fiber products or short-fiber products. The denier per filament (dpf) of the thermoplastic polyester elastomer yarn may be any value of denier.
The term of “denier (De)” used herein refers to the mass in grams per 9,000 meters of the fiber. Denier is related to the linear density of fiber, filament or yarn, or the mass of length per unit. Denier is measured by option B of ASTM D1577. In a preferred embodiment, the denier per filament of the thermoplastic polyester elastomer yarn is below or equal to 100 Denier (De), such as but not limited to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 Denier (De) (or any value or range in between). In a preferred embodiment, the denier per filament of the polyester yarn is below or equal to 200 Denier (De), such as but not limited to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200 Denier (De) (or any value or range in between).
In the above embodiments, the cross-section of the fiber may be a circular cross-section or a non-circular cross-section. The non-circular cross-section may be, for example but not limited to a cruciform cross-section, a triangular cross-section, a polygonal cross-section, a dumbbell cross-section, a Y-shape cross-section, a wavy straight line cross-section, a three-petal flower shape cross-section, a four-petal flower shape cross-section or other non-circular cross-sections commonly known by the person with ordinary skills in the art.
In the method for preparing a polyester elastic conjugated yarn of the present invention, other functional additives may be suitably added according to the need. Said functional additive includes but not limited to at least one of other thermoplastic polyester, a thermal stabilizer, a light stabilizer, a matting agent, a pigment, an antioxidant, an ultraviolet absorbent, a lubricant or a flame retardant.
The polyester clastic conjugated yarn prepared by the preparation method of the present invention can be used to produce mixed yarns with other fibers. Alternatively, said polyester clastic conjugated yarn can be combined with a core-spun yarn to form a yarn containing the polyester elastic conjugated yarn and other fibers. For instance, other fibers may include a natural fiber, a synthetic fiber or other fibers commonly known by the person with ordinary skills in the art. The natural fiber may be but is not limited to an animal fiber, a vegetable fiber, a mineral fiber, or other natural fibers commonly known by the person with ordinary skills in the art. The animal fiber may be but is not limited to wool, horse hair, rabbit hair, cattle hair, camel hair, mulberry silk or the hair or silk produced by other animals. The vegetable fiber may be but is not limited to cotton, hemp, kapok, coconut, bamboo, banana, mulberry, or the fibers derived from other plants. The mineral fiber may be but is not limited to asbestos (mountain). The synthetic fiber may be but is not limited to a polyester fiber, a nylon fiber, a polypropylene fiber or other synthetic fibers commonly known by the person with ordinary skills in the art.
In particular, the dyeing conditions of the polyester elastic conjugated yarns produced by the present invention may depend on the polyester fibers used to form them. In other words, the polyester clastic conjugated yarns can be dyed according to the dyeing condition of the polyester fibers.
In addition, the polyester clastic conjugated yarn prepared by the preparation method of the present invention includes a polyester yarn and a thermoplastic polyester elastomer yarn, and the polyester yarn and the thermoplastic polyester elastomer yarn are separated but twisted to each other. Please refer to
The properties of the polyester elastic conjugated yarn prepared by the preparation method of the present invention can be determined or defined by various parameters by analyzing the polyester elastic conjugated yarn or the yarn or fabric produced by using thereof. The parameters are described as below.
The yarn (or woven fabric) having 20 cm (L0) length was used as a sample. One end of the sample was fixed on the upper mould clamp. After the sample was stretched 60%, the sample was marked at 32 cm intervals and the length of the sample was recorded as L1. After 1 hour, the mould clamp was released. After another 1 hour, the length between the marks was measured and the length of the sample at that time was recorded as L2. The measurement stated above was repeated 3 times. The elastic recovery rate of the yarn was calculated according to the following equation. The results were presented by the mean of 3 tests after releasing for 1 hour.
The elastic recovery rate of the yarn (%)=[(L1−L2)/(L1−L0)]×100%
The method of the present invention can be implemented by the person with ordinary skills in the art according to the conventional technology in addition to the disclosures of the examples.
The Examples 1 to 4 for the preparation methods are illustrated as below. In Examples 1 to 4, the raw materials to be used in the preparation of the polyester clastic conjugated yarn of the present invention are PET fiber produced by conventional spinning method and TPEE thermoplastic polyester elastomer. The temperature of the heater, the rotational speed of the second roller, the scale of the fiber and the drawing ratio in Examples 1 to 4 are slightly different.
The false twister having the elements as shown in
In this example, the fiber A was a PET fiber and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a PET fiber formed after spinning was used as a raw material to carry out the false twisting process. After the PET fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 550 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 550 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 80/1 (De/fiber number)) having 4 of drawing ratio. After the PET fiber and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 550 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a PET fiber and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a PET fiber formed after spinning was used as a raw material to carry out a false twisting process. After the PET fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester
yarn (scale was 75/144 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/3 (De/fiber number)) having 2 of drawing ratio. After the PET fiber and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a PET fiber and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a PET fiber formed after spinning was used as a raw material to carry out a false twisting process. After the PET fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/144 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 80/4 (De/fiber number)) having 3 of drawing ratio. After the PET fiber and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
The tenacity at break, the elongation at break and the elastic recovery rate of the fabric after being stretched 60% of the polyester elastic conjugated yarn in Examples 1 to 4 were measured by the determine methods as stated above, and the results were shown in Table 1.
The polyester elastic conjugated yarns of the present invention were produced by using the PET fiber and the TPEE thermoplastic polyester elastomer as raw materials. According to the results shown in Table 1, the tenacities at break of the polyester elastic conjugated yarns of Examples 1 to 4 are between 3 to 4 (g/d), the elongations at break of those are all greater than 20% and the elastic recovery rates of the fabric of those after being stretched 60% are all greater than 90%. It shows that the polyester elastic conjugated yarns of Examples 1 to 4 have an excellent stretch elasticity and an elastic recovery rate and may not be broken easily.
The preparation methods of Examples 5 to 7 are illustrated as below. In Examples 5 to 7, the raw materials to be used in the preparation of the polyester elastic conjugated yarn of the present invention are the S/I fiber, the segment pie fiber, or the S/C fiber produced by conventional composite spinning method and the TPEE thermoplastic polyester elastomer. The raw materials, the scale of the fibers and the drawing ratios in Examples 5 to 7 are slightly different. In addition, the differences between Examples 5 to 7 and Examples 1 to 4 are that the fibers A in Examples 1 to 4 are produced by conventional spinning method and the fibers A in Examples 5 to 7 are produced by conventional composite spinning method.
In this example, the fiber A was a S/I fiber and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a S/I fiber formed after spinning was used as a raw material to carry out the false twisting process. After the S/I fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The S/I fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/36 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/1 (De/fiber number)) having 4 of drawing ratio. After the S/I fiber and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a S/C fiber and the fiber B was TPEE thermoplastic polyester elastomer. In this example, at first, a S/C fiber formed after spinning was used as a raw material to carry out the false twisting process. After the S/C fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The S/C fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/1 (De/fiber number)) having 5 of drawing ratio. After the S/C fiber and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a segment pic fiber and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a segment pie fiber formed after spinning was used as a raw material to carry out the false twisting process. After the segment pic fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The segment pie fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/3 (De/fiber number)) having 2 of drawing ratio. After the segment pie fiber and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
The tenacity at break, the elongation at break and the elastic recovery rate of the fabric after being stretched 60% of the polyester elastic conjugated yarn in Examples 5 to 7 were measured as the determine methods as stated above, and the results were shown in Table 2.
The polyester elastic conjugated yarns of the present invention were produced by using the S/I fiber, the segment pie fiber or the S/C fiber and the TPEE thermoplastic polyester elastomer as raw materials. According to the results shown in Table 2, the tenacities at break of the polyester elastic conjugated yarns of Examples 5 to 7 are between 3 to 4 (g/d), the elongations at break of those are all greater than 20% and the elastic recovery rates of the fabric of those after being stretched 60% are all greater than 90%. It shows that the polyester elastic conjugated yarns of Examples 5 to 7 have an excellent stretch elasticity and an elastic recovery rate and may not be broken easily.
The preparation methods of Examples 8 to 11 are illustrated as below. In Examples 8 to 11, the raw materials to be used in the preparation of the polyester elastic conjugated yarn of the present invention are polyester fibers with different cross-sections produced by conventional spinning method and the TPEE thermoplastic polyester elastomer. The temperature of the heater, the species of the polyester fiber, the shapes of the cross-section of the polyester fiber, the scale of the fibers and the drawing ratios in Examples 8 to 11 are slightly different.
In this example, the fiber A was a PET fiber (the shape of the cross-section was cruciform) and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a PET fiber (formed after spinning and the shape of the cross-section was cruciform) was used as a raw material to carry out the false twisting process. After the PET fiber was unwound and then passed through a first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/48 (De/fiber number)) having 1.55 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/1 (De/fiber number)) having 4 of drawing ratio. After the PET fiber (cruciform cross-section) and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a PET fiber (the shape of the cross-section was triangular) and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a PET fiber (formed after spinning and the shape of the cross-section was triangular) was used as a raw material to carry out a false twisting process. After the PET fiber was unwound and then passed through a first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/48 (De/fiber number)) having 1.55 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/1 (De/fiber number)) having 3.5 of drawing ratio. After the PET fiber (triangular cross-section) and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a CD fiber (the shape of the cross-section was circular) and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a CD fiber (formed after spinning and the shape of the cross-section was circular) was used as a raw material to carry out the false twisting process. The CD fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 180° C.) and was cooled by passing through the cooling plate 3. The CD fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/3 (De/fiber number)) having 2 of drawing ratio. After the CD fiber (circular cross-section) and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this example, the fiber A was a PBT fiber (the shape of the cross-section was circular) and the fiber B was a TPEE thermoplastic polyester elastomer. In this example, at first, a PBT fiber (formed after spinning and the shape of the cross-section was circular) was used as a raw material to carry out the false twisting process. After the PBT fiber was unwound and then passed through a first roller 1, it was heated by passing through the heater 2 (temperature was 180° C.) and was cooled by passing through the cooling plate 3. The PBT fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/24 (De/fiber number)) having 1.65 of drawing ratio. The TPEE thermoplastic polyester elastomer was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/4 (De/fiber number)) having 3 of drawing ratio. After the PBT fiber (circular cross-section) and the TPEE thermoplastic polyester elastomer were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and wound into a polyester elastic conjugated yarn by the winder 8.
The tenacity at break, the elongation at break and the elastic recovery rate of the fabric after being stretched 60% of the polyester elastic conjugated yarn in Examples 8 to 11 were measured as the determine methods as stated above, and the results were shown in Table 3.
The polyester elastic conjugated yarns of the present invention were produced by using the PET fiber, the CD fiber or the PBT fiber (with different shapes of the cross-section) and the TPEE thermoplastic polyester elastomer as raw materials. According to the results shown in Table 3, the tenacities at break of the polyester elastic conjugated yarns of Examples 8 to 11 are between 3 to 4 (g/d), the elongations at break of those are all greater than 20% and the elastic recovery rates of the fabric of those after being stretched 60% are all greater than 90%. It shows that the polyester elastic conjugated yarns of Examples 8 to 11 have an excellent stretch elasticity and an elastic recovery rate and may not be broken easily.
The preparation methods of Comparative Examples 1 to 3 are illustrated as below, Comparative Examples 1 to 3 are used to present the conventional conjugated yarns in the field. In Comparative Examples 1 to 3, the raw material of the fiber A is PET fiber produced by conventional spinning method. The raw materials of the fiber B in Comparative Examples 1 to 3 are the PET fiber, the PBT fiber and the Spandex fiber respectively. Said two materials are used for producing the polyester elastic conjugated yarn by the preparation method of the present invention.
In this comparative example, the fiber A was a PET fiber and the fiber B was a PET fiber. In this comparative example, at first, a PET fiber formed after spinning was used as a raw material to carry out a false twisting process. After the PET fiber was unwound and then passed through the first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.55 of drawing ratio. The fiber B (PET fiber) was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 75/72 (De/fiber number)) having 1 of drawing ratio. After two PET fibers were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarns entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this comparative example, the fiber A was a PET fiber and the fiber B was a PBT fiber. In this comparative example, at first, a PET fiber formed after spinning was used as a raw material to carry out the false twisting process. After the PET fiber was unwound and then passed through a first roller 1, it was heated by passing through the heater 2 (temperature was 200° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.55 of drawing ratio. The PBT fiber was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/24 (De/fiber number)) having 1 of drawing ratio. After the PET fiber and the PBT fiber were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarns entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
In this comparative example, the fiber A was a PET fiber and the fiber B was a Spandex fiber. In this comparative example, at first, a PET fiber formed after spinning was used as a raw material to carry out the false twisting process. After the PET fiber was unwound and then passed through a first roller 1, it was heated by passing through the heater 2 (temperature was 180° C.) and was cooled by passing through the cooling plate 3. The PET fiber was undergone a twisting/detwisting process by passing through the friction spindle set 4, and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a polyester yarn (scale was 75/72 (De/fiber number)) having 1.65 of drawing ratio. The Spandex fiber was unwound under room temperature and then first passed through the zero roller 9 and was stretched by passing through the second roller 5 (rotational speed was 500 m/min) so as to form a thermoplastic polyester elastomer yarn (scale was 40/3 (De/fiber number)) having 3 of drawing ratio. After the PET fiber and the Spandex fiber were stretched at the second roller 5 (rotational speed was 500 m/min), the respectively formed polyester yarn and thermoplastic polyester elastomer yarn entered into an air nozzle 6 (air pressure was 3.0 Kg/Cm2) at the same time. Both of them were blended and interlaced by the action of the air nozzle 6. They then passed through the third roller 7, and were wound into a polyester elastic conjugated yarn by the winder 8.
The tenacity at break, the elongation at break and the elastic recovery rate of the fabric after being stretched 60% of the polyester elastic conjugated yarn in Comparative Examples 1 to 3 were measured as the determine methods as stated above, and the results were shown in Table 4.
According to the results shown in Table 4, the polyester elastic conjugated yarn of Comparative Example 1 which is produced by using the PET fiber as raw materials of the fiber A and the fiber B cannot be stretched to 60% although the drawing rates of these two PET fibers are different. Therefore, the elastic recovery rate of the polyester elastic conjugated yarn of Comparative Example 1 is poor. The elastic recovery rate of the polyester elastic conjugated yarn (produced by using the PET fiber and the PBT fiber as raw materials of the fiber A and the fiber B) of Comparative Example 2 after being stretched 60% (%) is below 15 although the Comparative Example 2 used two different polyester fibers to produce the conjugated yarn. Therefore, the elastic recovery rate of the polyester elastic conjugated yarn of Comparative Example 2 is poor. Comparative Example 3 uses Spandex fiber (commonly used for increasing the elastic recovery rate) as the fiber B to produce the polyester elastic conjugated yarn. Although the elastic recovery rate of the polyester elastic conjugated yarn of Comparative Example 3 is greater than 95%, said polyester elastic conjugated yarn includes two different components and thus cannot be recycled simultaneously.
Accordingly, compared to the conventional conjugated yarn, the polyester elastic conjugated yarn (includes at least two different components) produced by the preparation method of the present invention has an excellent stretch elasticity and an elastic recovery rate. The fabric produced by the polyester elastic conjugated yarn of the present invention by weaving, dyeing and finishing would also has an excellent stretch elasticity and an elastic recovery rate. In addition, both the polyester fiber and the thermoplastic polyester elastomer used in the preparation method of the present invention belong to a polymer of the polyester. Therefore, it can be recycled simultaneously and thus can reduce the cost of recycling and the impact on the environment.
According to the disclosures of the examples of the specification, one skilled in the art can understand that the above specific examples are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever. The person with ordinary skills in the art may implement the present invention by various modification, replacement and which is not differ from the technical features of the disclosure of the present invention. The disclosures have various types which would not affect the implement according to the examples of the specification of the present invention. The claims define the scopes of the present application provided in the specification encompass the above-mentioned method, structures and the equivalent inventions.
| Number | Date | Country | Kind |
|---|---|---|---|
| 112122182 | Jun 2023 | TW | national |
