Patent Application
20160194789
The present application relates to the technical field of superclean wiping cloth, especially a production method of superclean wiping cloth.
Wiping cloth have soft surfaces which are suitable for wiping the sensitive surface of object, they do not lose fibres during rub, and have good water-absorbing property and clean efficiency. In view of above advantages, the wiping cloth are widely applied, e.g., in the fields of production lines of semiconductor chip, microprocessor, etc., disk driver, composite material, display product such as LCD, production line of circuit board, precise instrument, optical production, aviation industry, PCB product, medical instruments, laboratory, dust-free plant, etc. All the time nonvolatile residues and dust particles residues are significant factors effecting the application of wiping cloth. The residual amount of the nonvolatile residues (NVR value) and the residual amount of the dust particles residues (LPC value) affect the application scope of dust-free cloth. For example, in the optical industry, if the NVR value of wiping cloth is too high, the light transmittance will be affected and the emission efficiency will be decreased, whereby many problems will be caused, such as high energy consumption of device, poor stability and display quality, etc. In high-end industries, the NVR value of wiping cloth is normally required not more than 0.05 mg/g, and the LPC value is normally required not more than 50 counts/cm2. The key process to affect the cleanliness of wiping cloth is the rinsing process of woven gray fabric. In the current rinsing process, ordinary well water, river water or tap water, which contains large amount of ions and impurities, is generally used, this cannot enhance the cleanliness of cloth greatly. The improved rising process is normally as follows: injecting the pure water into an overflow rinsing vat, and adding some chemical detergents therein to rinse the gray fabric in an intermittent circulating rinse way. However because of the disadvantages of overflow machine itself, and low cleanliness of the water used, the cleanliness will varies largely in the produced wiping cloths, so it is difficult to guarantee the production quality, that is, it is difficult to ensure the NVR value is not more than 0.05 mg/g, and LPC value is not more than 50 counts/cm2. The wiping cloth with low cleanliness has poor stain removal property, which will harm the devices, sensitive materials, etc., even shorten the service life of the devices and materials, if it is applied thereto in a long term.
Therefore, a superclean wiping cloth with high cleanliness and stable quality, along with simple and efficient production process must be provided.
The object of the present invention is to provide a production method of superclean wiping cloth, producing a superclean wiping cloth with high cleanliness and stable quality, in a simple and efficient production process.
The present invention provides a production method of superclean wiping cloth, comprising the steps of
Preferably, the gray fabric in step B has yarn densities as follows: warp density is between 150 to 230 yarns/inch, preferably 180 yarns/inch; weft density is between 80 to 120 yarns/inch, most preferably 100 yarns/inch.
Preferably, the rinsing process in step C is performed in an environment above ISO 8 grade, the pure water, the resistance of which is more than 18M ohm, is selected from purified water or RO water or ultrapure water. In step C, the gray fabric is circulated 5 to 12 times in the high temperature pure water.
Preferably, if the yarns are superfine fibers, the rinsing effect will be optimum when the water temperature in step C is 110° C. ±3° C. if the yarns are dacrons, the rinsing effect will be optimum when the water temperature in step C is 100° C. ±3° C.
Preferably, the surfactant is 0.3% by weight, the enzyme catalyst is just a small amount, the sodium carbonate is 0.5% by weight, the sodium percarbonate is 0.5% by weight, the sodium hydroxide is 10 g/L.
Preferably, the dehydrating rotating speed of the rotating centrifugal purification dehydrator in step D is 400 rpm.
Preferably, the temperature of the setting in step E is 200° C., and the setting speed is 45 m/min.
Preferably, a nonvolatile residue test is applied on the wiping cloth manufactured through step A to step I, the NVR value of the wiping cloth is not more than 0.05 mg/g. A liquid dust particles test is applied on the wiping cloth manufactured through step A to step I, the LPC value of the wiping cloth is not more than 50 counts/cm2.
The present invention provides a production method of superclean wiping cloth, the rinsing process of the woven gray fabric is the key process in the whole production process. In the rising process, the airflow rinsing machine is used to rinse the gray fabric, avoiding the reverse contamination during washing and unwanted damage due to overmuch process circulation, and ensuring a high cleanliness of gray fabric after rinsing. Excellent effect of removing oligomers and dust particles will be achieved through adding degreasers of specific formula into the airflow rinsing machine, in a clean environment, at a specific temperature, whereby a wiping cloth product with stable quality, i.e., a real superclean wiping cloth, will be obtained. The rising process is simple and highly efficient, it ensures the stability of product quality and high cleanliness, producing a superclean wiping cloth with high cleanliness and stable quality, using a simple and efficient production process.
The present invention will be further described in detail hereinafter with reference to the accompanying drawing.
It should be understood that the preferred embodiment discussed herein are only for illustrating the present invention, but not to limit the invention.
As shown in
A. choosing filaments;
B. weaving;
C. removing oligomers and dust particles through rinsing process;
D. dehydrating;
E. setting;
F. cutting;
G. washing;
H. drying; and
I. packaging.
The step A to step I are described in detail as follows.
Step A. Choosing filaments: choose continuous filament yarn above AA grade, wherein the oil content of yarn is lower than 1.5%.
Step B. Weaving: weave the filament from step A to form a gray fabric, in the environment of ISO 1 to ISO 9 grade, wherein ISO 9 grade is the most clean grade, and the environment should be as clean as possible. The fabric is woven by weave of 28-42 stitches, double knit weave, weave of 1/1, ½ or ⅓, or the combination of the mentioned two or three weaves. Wherein the specific number of stitches can be selected based on the actual requirement. The gray fabric has yarn densities as follows: warp density is between 150 to 230 yarns/inch, preferably 180 yarns/inch; weft density is between 80 to 120 yarns/inch, preferably 100 yarns/inch.
Step C. Removing oligomers and dust particles through rinsing process: rinse the gray fabric from step B circularly by high temperature pure water, using an airflow rinsing machine without reverse contamination as a boiling-off rinsing equipment, at a water temperature of 80° C. to 130° C. If the yarns are superfine fibers, the rinsing effect will be optimum when the water temperature in step C is 110° C. ±3° C. If the yarns are dacrons, the rinsing effect will be optimum when the water temperature in step C is 100° C. ±3 ° C. Add degreasers, such as surfactant, enzyme catalyst, sodium carbonate, sodium percarbonate, or sodium hydroxide, in order to remove oligomers, wherein the surfactant is 0.1% to 0.8% by weight, the sodium carbonate is 0.2% to 1% by weight, the sodium percarbonate is 0.2% to 1% by weight, the sodium hydroxide is 5 g/L to 20 g/L. Preferably the surfactant is 0.3% by weight, the enzyme catalyst is just a small amount, the sodium carbonate is 0.5% by weight, the sodium percarbonate is 0.5% by weight, the sodium hydroxide is 10g/L. The bath ratio of gray fabric to the rinsing solution is 1:3 to 1:10, the rinsing process is performed in an environment above ISO 8 grade, the pure water is selected from purified water or RO water or ultrapure water, the gray fabric is circulated 5 to 12 times in the high temperature pure water, certainly the number of circulation will depends on the cleanliness of the gray fabric.
Rinsing conditions, such as temperature, lasting time, etc., and the formula of degreaser are determined by more experiments through computer process, whereby the optimum effect of rinsing process will be obtained, such that the oligomers and dust particles can be efficiently removed, and a high cleanliness of the gray fabric after rinsing will be achieved.
An ordinary overflow rinsing machine will carry various contaminants after a long-term use, and the contaminants can contaminate the gray fabric easily during rinsing process, leading to a reverse contamination. In the present invention, an airflow rinsing machine is used to rinse the gray fabric, avoiding the reverse contamination during rinsing process, ensuring a high cleanliness of gray fabric after rinsing process.
In addition, the rinsing process for the woven gray fabric is the most important process during the production of wiping cloth. In the rising process, airflow rinsing machine is used to rinse the gray fabric, avoiding the reverse contamination during rinsing process, and ensuring the high cleanliness of gray fabric after rinsing. Meanwhile excellent effect of removing oligomers and dust particles will be achieved by adding degreasers of specific formula into the airflow rinsing machine, in a clean environment, at a specific temperature, whereby a wiping cloth product with stable quality, i.e., real superclean wiping cloth, will be obtained. The rising process is simple and highly efficient, it ensures the stability and high cleanliness of the product, making a real superclean wiping cloth having high cleanliness and stable quality, using a simple and efficient process.
Step D. Dehydrating: dehydrate the oligomer-free and dust-free gray fabric by using a rotating centrifugal purification dehydrator, wherein the rotating centrifugal purification dehydrator has a dehydrating part made of 316 stainless steel, the dehydrating rotating speed is 350 to 600 rpm, preferably 400 rpm. Ions, dust particles and other dirt can be removed from the fiber surfaces of gray fabric efficiently.
Step E. Setting: set the gray fabric by using a dust-free and silicone oil-free setting machine in an environment above ISO 8 grade in the totally-enclosed mode, at a temperature from 160° C. to 210° C., preferably 200° C., with a setting speed of 30 to 60 m/min, preferably 45 m/min.
Step F. Cutting: put the gray fabric after setting into the dust-free room above ISO 7 grade, and cut the gray fabric through ultrasonic wave cutting, laser cutting or thermal cutting, to form a preliminary wiping cloth;
Step G. Washing: wash the wiping cloth after cutting in an environment above ISO 6 grade, by using a roller or spray washing, for 3 to 5 times, 5 to 10 minutes each time, wherein the bath ratio of wiping cloth to washing solution is 1:10 to 1:20.
Step H. Drying:dry the washed wiping cloth at a temperature of 70° C. to 95° C., using purified hot gas spraying process or a roller.
Step I. Packaging: package the wiping cloth in the dust-free room above ISO 5 grade, preferably above ISO 4 grade.
The environment for packing can be chosen according to actual requirement for products. After the packaging process, the production process of wiping cloth is finished.
Nonvolatile residue test (NVR test) is a test method to measure the content of nonvolatile residues on the wiping cloth. When testing, a certain amount of solvent is used to immerse a predetermined tested cloth, then collect the solution, evaporate the solvent, and weight the residue using a micro balance, whereby the NVR value can be obtained (the detailed method is performed according to IESTCC004.3) after conversion. NVR test is applied on the wiping cloth manufactured by the above processes, NVR value of the wiping cloth is 0.03 mg/g, and it is obvious that such NVR value is no more than 0.05 mg/g, so its cleanliness is better than the industry standard.
Liquid dust particles test (LPC test) is an important method to measure the cleanliness of wiping cloth. LPC test is applied on the wiping cloth manufactured by the above processes, the LPC value of wiping cloth is not more than 28 counts/cm2, and it is obvious that such LPC value is not more than 50 counts/cm2, so the cleanliness is better than the industry standard.
It is certified by the NVR and LPC test that the cleanliness of wiping cloth manufactured by the production process according to the present invention is greatly better than the relevant standard of the wiping cloth, and such wiping cloth is a real superclean wiping cloth.
The embodiments described hereinbefore are merely preferred embodiments and not for purposes of any restrictions or limitations on the invention. Therefore, equivalent reconfiguration according to the description and drawings of the present invention, or by directly or indirectly applying other relevant technical field, may be incorporated into ambit of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201210574599.0 | Dec 2012 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2013/001032 | 9/2/2013 | WO | 00 |
