Patent Application
20240074547
The present invention relates to fastener tapes for attaching separable insertion mechanism. In particular, the present invention relates to a fastener tape provided with a reinforcing portion on at least one main surface.
In a slide fastener with a separable insertion mechanism composed of an insert pin and a box pin, conventionally, the tape surface of a portion of a fastener tape to which the separable insertion mechanism is attached is reinforced to prevent the tape surface from being damaged. As a general technique for this reinforcement, conventionally, a reinforcing tape made of a synthetic resin film, a woven fabric, or the like is adhered and integrated to the ends of the fastener tape. This reinforcing tape is adhered to the fastener tape with an adhesive, and generally, an intermediate layer (anchor coating agent) is provided between the film on the fastener surface and the adhesive to improve adhesion.
For example, in Patent Literature 1 (Japanese Patent No. 3650733), there is disclosed a reinforcing tape for a slide fastener consisting of a polyamide elastomer film having a flexural modulus of 6,000 to 9,000 kg/cm 2 and an adhesive layer. As a preferred embodiment, it is disclosed that an intermediate layer is interposed between the polyamide elastomer film and the adhesive layer wherein the intermediate layer is thinner than the thickness of each of these layers. In this case, it is also disclosed that a polyester anchor coating agent is preferable for the intermediate layer.
However, the technique disclosed in Patent Literature 1 has the following problems:
The present invention has been made in view of the above problems, and in one embodiment, one object of the present invention is to provide a fastener tape that satisfies a predetermined standard of peeling resistance between a reinforcing portion and a fastener tape body without using an anchor coating agent and in a simple manner.
As a result of intensive studies by the present inventors, it has been found that, instead of a reinforcing tape consisting of multiple structures such as a film layer, an intermediate layer, and an adhesive layer, by impregnating and solidifying a single-layer reinforcing portion in a fastener tape, it is possible to obtain a fastener tape satisfying a predetermined standard of peeling resistance between the reinforcing portion and the fastener tape body in a simple manner. The present invention has been completed based on the above findings, and is exemplified as below.
According to the present invention, it is possible to provide a fastener tape that satisfies a predetermined standard of peeling resistance between a reinforcing portion and a fastener tape body without using an anchor coating agent and in a simple manner.
Hereinafter, embodiments of the present invention will now be described in detail with reference to the drawings. It should be understood that the present invention is not intended to be limited to the following embodiments, and any change, improvement or the like of the design may be appropriately added based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. Note that dimensions, scales, angles, and the like in the drawings describing each embodiment of the present invention are shown for convenience in order to facilitate understanding, and do not necessarily represent actual dimensions, scales, angles, and the like.
The pair of fastener tapes 10a and 10b comprise: a pair of long fastener tape bodies 11a and 11b each having a longitudinal direction and a width direction; and a pair of reinforcing portions 12a, 12b welded to one longitudinal end of the fastener tape bodies 11a, 11b. The separable insertion mechanism is mounted on the reinforcing portions 12a, 12b, at one edge in the width direction of the fastener tapes 10a and 10b where the coupling tooth rows 32a and 32b are provided. Specifically, an insert pin 37 is provided in the reinforcing portion 12a, and a box pin 35 and a box body 36 are provided in the reinforcing portion 12b. However, the present invention is not limited thereto. The insert pin 37 is releasably engageable in a slot in the box body 36. The box body 36 and the box pin 35 are integrally formed as one piece. The slider 33 is slidably attached to the coupling tooth rows 32a, 32b for engaging and disengaging the coupling tooth rows 32a, 32b.
The fastener tape bodies 11a and 11b are, for example, made by weaving or knitting fibers composed of polyethylene terephthalate.
The reinforcing portion 12a is, for example, a single layer comprising a polypropylene resin, and is impregnated and solidified in the fastener tape body 11a. In other words, there is no intermediate layer such as an adhesive layer or an anchor coating agent between the reinforcing portion 12a and the fastener tape body 11a, and a reinforcing portion 12a consisting of a single layer is provided on at least one main surface of the fastener tape body 11a.
In the present specification, the term “impregnated and solidified” refers to a state in which at least a part of the material (for example, reinforcing sheet) that forms the reinforcing portion 12a permeates into the fibers of the fastener tape body 11a and solidifies. In addition, in the present embodiment, when referring to “impregnation and solidification”, it does not specify an invention of a product by the manufacturing method of the product, because it simply indicates a state to specify the structure or characteristics.
The reinforcing portion 12a is formed by laminating a material (for example, a reinforcing sheet made of a thermoplastic resin) which in turn become the reinforcing portion 12a on the fastener tape body 11a, and then heating the fastener tape body 11a at, for example, 200° C. for about 3 to 10 seconds to weld the reinforcing sheet into the fastener tape body 11a. In addition, although the material for the reinforcing portion 12a is a flexible solid here, it may be a semi-solid such as gel or a liquid. In addition, heating means such as a hot plate, ultrasonic waves, and high frequencies can be used for the heating. Hereinafter, the material before welding, which in turn becomes the reinforcing portion, will be referred to as a reinforcing sheet.
In order to sufficiently impregnate the reinforcing portion 12a into the fastener tape body 11a, the reinforcing portion 12a comprises a polypropylene resin. Preferably, the reinforcing portion 12a consists of polypropylene resin. The type of polypropylene resin is not particularly limited, and may be a propylene homopolymer, or a copolymer of propylene and another α-olefin having about 2 to 20 carbon atoms. In the case of a copolymer, it may be a random copolymer or a block copolymer. The polypropylene resin may be unmodified or modified. Preferably, the polypropylene resin is maleic acid-modified polypropylene.
For example, in one embodiment of the present invention, in 100 parts by weight of the whole, the reinforcing portion 12a may comprise 50 to 99 parts by weight of random or block polypropylene, and may comprise 1 to 20 parts by weight of acid modified (for example, maleic acid modified) polypropylene, and may comprise 10 to 40 parts by weight of elastic polypropylene (preferably block copolymer).
Further, in the reinforcing portion 12a, the thickness d of a fraction which is impregnated and solidified in the fastener tape body 11a is preferably 20 to 115 μm. By setting the thickness d to 20 μm or more, the peeling resistance between the reinforcing portion 12a and the fastener tape body 11a after a perchlorate dry test can be made equal to or greater than that of a conventional product. Further, by setting the thickness d to 70 μm or more, it is possible to prevent separation between the reinforcing portion 12a and the fastener tape body 11a after the perchlorate dry test, which is more preferable. Moreover, setting the thickness d to 100 μm or less is more preferable because it is possible to prevent the thickness D of the reinforcing sheet from becoming excessively large while suppressing a phenomenon that the fibers of the fastener tape body 11a are exposed on the surface of the product (the surface of the reinforcing portion 12a).
In order to facilitate control of the thickness d of the portion impregnated and solidified in the fastener tape body 11a, the thickness D of the reinforcing sheet can be, for example, within the range of 100 to 160 μm, such as within the range of 120 to 140 μm.
In the reinforcing portion 12a, the ratio d/D between the thickness d of the impregnated and solidified fraction and the thickness D of the reinforcing sheet is preferably 0.14 to 0.83. Here, the thickness d of the impregnated and solidified fraction is defined as a value obtained by subtracting a measured value of product thickness after the impregnation and the solidification (thickness of the reinforcing portion and the fastener tape body) from a value obtained by adding the thickness of the reinforcing sheet, which in turn becomes the reinforcing portion, before the impregnation and the solidification and the thickness of the fastener tape body before the impregnation and the solidification.
By setting d/D to 0.14 or more, the peeling resistance between the reinforcing portion 12a and the fastener tape body 11a after a perchlorate dry test can be made equal to or greater than that of a conventional product. Further, by setting d/D to 0.50 or more, it is possible to prevent separation between the reinforcing portion 12a and the fastener tape body 11a after the perchlorate dry test, which is more preferable. Moreover, setting d/D to 0.82 or less is more preferable because it is possible to prevent the thickness D of the reinforcing sheet from becoming excessively large while suppressing a phenomenon that the fibers of the fastener tape body 11a are exposed on the surface of the product (the surface of the reinforcing portion 12a). From this point of view, d/D is even more preferably 0.80 or less, and even more preferably 0.70 or less.
In order to improve the peel strength between the reinforcing portion 12a and the fastener tape body 11a, it is preferable that the reinforcing portion 12a and the fastener tape body 11a are crosslinked. Crosslinking is typically accomplished with a crosslinking agent. Although the type of crosslinking agent is not particularly limited, it is preferable to use carbodiimide as the crosslinking agent when the fastener tape body 11a comprises polyethylene terephthalate. As carbodiimides, it is preferable to use cyclic carbodiimides or linear carbodiimides. Furthermore, it is preferable that the reinforcing portion 12a and the fastener tape body 11a are crosslinked by cyclic carbodiimide. As a result, the acid-modified parts included in the reinforcing portion 12a, and the carboxyl groups included in the fastener tape body 11a can be crosslinked. In addition, in this embodiment, when referring to “crosslinked”, it does not specify an invention of a product by the manufacturing method of the product, because it simply indicates a state to specify the structure or characteristics.
For example, in one embodiment of the present invention, 0.5 to 8 parts by weight of a crosslinking agent may be further added to 100 parts by weight of the entire reinforcing portion 12a. Further, when the reinforcing portion 12a uses maleic acid-modified polypropylene and uses cyclic carbodiimide as a crosslinking agent, the mass ratio of the maleic acid-modified polypropylene and the cyclic carbodiimide is preferably 2:1 to 4:1. When the reinforcing portion 12a uses maleic acid-modified polypropylene and use linear carbodiimide as a crosslinking agent, the mass ratio of the maleic acid-modified polypropylene and the linear carbodiimide is preferably 0.5:2 to 1.5:2.
By using such a configuration, an anchor coating agent is not used in the reinforcing portion, which is also desirable from an environmental point of view. In addition, the reinforcing portion can be easily manufactured without forming a plurality of layers. Furthermore, it is possible to provide a fastener tape in which the peeling resistance between the reinforcing portion and the fastener tape body satisfies a predetermined standard.
Hereinafter, the present invention will be described in more detail based on specific experiments, but the present invention is not limited to the following experimental examples, and can be implemented with appropriate modifications within the scope of not changing the spirit of the invention.
The structure of Comparative Example 1 is a conventional example, and the fastener tape includes a fastener tape body and a reinforcing tape adhered to at least one main surface of the fastener tape body. The reinforcing tape was prepared by applying a polyester anchor coating agent to the back surface of a 120 μm thick nylon elastomer film (manufactured by ATOCHEM, flexural modulus 7,500 kg/cm 2) to a thickness of 2 to 3 μm, and then laminating a polyester hot-melt adhesive layer with a thickness of 60 μm (manufactured by TOYOBO CO., LTD., Vylon GM900). In Comparative Example 1, when the reinforcing tape was adhered to the fastener tape body, the main surface of the fastener tape was impregnated with the adhesive layer (adhesive) of the reinforcing tape. Note that the impregnated thickness d of Comparative Example 1 was the one of the impregnation of the adhesive layer, and thus the impregnated thickness is not necessarily equivalently comparable to Examples 1 to 6, which will be described later.
The structure of Example 1 has substantially the same shape as the fastener tape 10a according to the above embodiment. The fastener tape includes a fastener tape body and a reinforcing portion provided on at least one main surface of the fastener tape body. The reinforcing portion was a single layer containing, for example, a polypropylene resin, and was impregnated and solidified in the fastener tape body by heating the reinforcing sheet at 200° C. for 3 seconds with a heater. As shown in Table 1, the thickness D of the reinforcing sheet was set to 140 μm, and the fastener tape body and the reinforcing sheet were welded by heating with a clearance distance from the heater set to medium during welding to prepare a fastener tape. Specifically, a reinforcing portion impregnated in the fastener tape body was formed, and the reinforcing portion was solidified by natural cooling.
Example 2 was the same as in Example 1 except that the reinforcing sheet thickness D was set to 120 μm, and the fastener tape body and the reinforcing sheet were welded by heating with a clearance distance from the heater set to medium during welding to prepare a fastener tape.
Example 3 was the same as in Example 1 except that the reinforcing sheet thickness D was set to 140 μm, and the fastener tape body and the reinforcing sheet were welded by heating with a clearance distance from the heater set to large during welding to prepare a fastener tape.
Example 4 was the same as in Example 1 except that the reinforcing sheet thickness D was set to 120 μm, and the fastener tape body and the reinforcing sheet were welded by heating with a clearance distance from the heater set to large during welding to prepare a fastener tape.
Example 5 was the same as in Example 1 except that the reinforcing sheet thickness D was set to 140 μm, and the fastener tape body and the reinforcing sheet were welded by heating with a clearance distance from the heater set to small during welding to prepare a fastener tape.
Example 6 was the same as in Example 1 except that the reinforcing sheet thickness D was set to 120 μm, and the fastener tape body and the reinforcing sheet were welded by heating with a clearance distance from the heater set to small during welding to prepare a fastener tape.
In this experiment, fastener tapes were prepared under each of the seven conditions shown in Table 1, and the presence or absence of peeling was measured after the perchlorate dry test based on JIS L 1931-2. In addition, from the viewpoint of aesthetics of the fastener tape, whether or not the fastener tape body is exposed from the reinforcing portion laminated and welded to the main surface of the fastener tape body was visually inspected and compared. If the fastener tape body is exposed from the reinforcing portion, it is not preferable from the point of view of aesthetics.
The experimental results are shown in Table 1. The impregnation thickness d of the fastener tape of Comparative Example 1 was 20 μm, and d/D was 0.13. In Comparative Example 1, since the reinforcing portion was adhered, the fastener tape body was not exposed. In Example 1, the impregnation thickness d of the fastener tape was 70 μm, d/D was 0.50, and the fastener tape body was not exposed. In Example 2, the impregnation thickness d of the fastener tape was 70 μm, d/D was 0.58, and the fastener tape body was not exposed. In Example 3, the impregnation thickness d of the fastener tape was 20 μm, d/D was 0.14, and the fastener tape body was not exposed. In Example 4, the impregnation thickness d of the fastener tape was 20 μm, d/D was 0.17, and the fastener tape body was not exposed. In Example 5, the impregnation thickness d of the fastener tape was 115 μm, and d/D was 0.82, and the fastener tape body was partly exposed, but the appearance was not greatly impaired. In Example 6, the impregnated thickness d of the fastener tape was 100 μm, and d/D was 0.83, and the fastener tape body was partly exposed, but the appearance was not greatly impaired.
Also, in Comparative Example 1, Example 3, and Example 4, peeling of the same degree was observed after perchlorate dry washing, but Examples 1 to 2 and 5 to 6 did not show peeling.
According to Table 1, it was confirmed that each of the Examples prepared according to the present invention, while adopting a reinforcing portion having a single-layer structure, achieves a peeling resistance equal to or greater than that of the prior art when its peeling resistance is taken as a standard. That is, it was possible to provide a fastener tape that satisfies a predetermined standard of peeling resistance between the reinforcing portion and the fastener tape body without using an anchor coating agent and in a simple manner. This is considered to be because the fastener tape body was impregnated with the reinforcing portion and solidified, so that the reinforcing portion enters between the fibers of the fastener tape body, and the anchor effect improves the peeling resistance of the fastener tape.
Further, in the reinforcing portion, it was confirmed that by setting the ratio d/D between the impregnation thickness d and the thickness D of the reinforcing sheet to 0.83 or less, particularly 0.80 or less, it is possible to suppress the exposure of the fastener tape body from the reinforcing portion, thereby suppressing appearance defects.
In order to compare the effects of crosslinking, the peel strengths of Examples 7 to 12 with a crosslinking agent added and Example 13 with no crosslinking agent added were compared.
The structure of Example 7 has substantially the same shape as the fastener tape 10a according to the above embodiment. The fastener tape includes a fastener tape body and a reinforcing portion provided on at least one main surface of the fastener tape body. The reinforcing portion was a single layer containing, for example, a polypropylene resin, and was impregnated and solidified in the fastener tape body by heating the reinforcing sheet at 200° C. for 3 seconds with a heater. Furthermore, the reinforcing portion and the fastener tape body were crosslinked by a crosslinking agent. As shown in Table 2, the fastener tape body was 100 parts by weight of polyethylene terephthalate, and assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 94 parts by weight of polypropylene, 6 parts by weight of maleic acid-modified polypropylene, and adding 2 parts by weight of cyclic carbodiimide as a crosslinking agent. In addition, the parts by weight shown in Table 2 are based on 100 parts by weight of the reinforcing sheet composition, and the crosslinking agent was shown as being further added to the 100 parts by weight of the reinforcing sheet composition.
Example 8 was the same as in Example 7 except that assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 97 parts by weight of polypropylene, 3 parts by weight of maleic acid-modified polypropylene, and adding 6 parts by weight of linear carbodiimide as a crosslinking agent.
Example 9 was the same as in Example 7 except that assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 98.5 parts by weight of polypropylene, 1.5 parts by weight of maleic acid-modified polypropylene, and adding 0.5 parts by weight of cyclic carbodiimide as a crosslinking agent.
Example 10 was the same as in Example 7 except that assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 98 parts by weight of polypropylene, 2 parts by weight of maleic acid-modified polypropylene, and adding 4 parts by weight of linear carbodiimide as a crosslinking agent.
Example 11 was the same as in Example 7 except that assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 91 parts by weight of polypropylene, 9 parts by weight of maleic acid-modified polypropylene, and adding 3 parts by weight of cyclic carbodiimide as a crosslinking agent.
Example 12 was the same as in Example 7 except that assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 96 parts by weight of polypropylene, 4 parts by weight of maleic acid-modified polypropylene, and adding 8 parts by weight of linear carbodiimide as a crosslinking agent.
Example 13 was the same as in Example 7 except that assuming the composition of the reinforcing sheet, which in turn became the reinforcing portion, was 100 parts by weight, a fastener tape was prepared by setting 96 parts by weight of polypropylene, 4 parts by weight of maleic acid-modified polypropylene, and without adding a crosslinking agent.
In this experiment, fastener tapes were prepared under the seven conditions shown in Table 2, and the peel strength (N) of the fastener tapes was measured. The method for evaluating the peel strength is shown below. A T-type peel test was performed according to JIS K 6854-3 for evaluation. A non-surface-treated PET film having a thickness of 25 μm was used as the material to be adhered, and a resin for an impregnated film having a thickness of 2 mm was prepared as an adhering material. After that, the PET film and the resin for the impregnated film were thermally welded and cut into a width of 25 mm to prepare a test piece sample. After that, the peel strength was determined using a tensile tester, and the average peel force required to peel the adherend material was obtained. In addition, the presence or absence of yellowing of the reinforcing portion was visually inspected and compared.
The experimental results are shown in Table 2. The peel strength of Example 7 was 35 N, the peel strength of Example 8 was 25 N, the peel strength of Example 9 was 20 N, the peel strength of Example 10 was 20 N, the peel strength of Example 11 was 38N, the peel strength of Example 12 was 22N, and the peel strength of Example 13 was 1N. Further, in Examples 7 to 10 and 13, yellowing, that is, the resin of the reinforcing portion turning yellow, was not observed, but in Examples 11 and 12, yellowing was observed. Yellowing is undesirable from the point of view of aesthetics.
From these results, it was confirmed that, when maleic acid-modified polypropylene was added as the composition of the reinforcing portion, regardless of whether cyclic carbodiimide or linear carbodiimide was used as the crosslinking agent, there was a tendency that stronger peel strength could be achieved as the amount of crosslinking agent added increased. It was also found that cyclic carbodiimide can achieve stronger peel strength than linear carbodiimide. From this result, the crosslinking agent is preferably carbodiimide, more preferably added by 0.5 to 8 parts by weight. Furthermore, in order to obtain a fastener tape with further suppressed yellowing, addition of 4 to 6 parts by weight of linear carbodiimide or 2 to 3 parts by weight of cyclic carbodiimide is preferable from the viewpoint of the balance between improvement in peel strength and prevention of yellowing.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-058715 | Mar 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2021/041975 | 11/15/2021 | WO |
