JPS61171332A - Manufacture of air-permeable waterproof cloth - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION B) Industrial Application Field The present invention relates to a method for manufacturing a multilayer fabric having breathability and waterproofness. More specifically, the present invention relates to a method for producing a multilayer fabric for clothing that is flexible, breathable, and waterproof.

(B) Prior Art Conventional waterproof fabrics have been mainly manufactured by forming a resin film on the surface of a woven or knitted material by coating or laminating. However, in order to ensure sufficient waterproofness, such fabrics sacrifice breathability. As a solution, JP-A-56-260
In the 763 report, it is proposed that a synthetic polymer mainly composed of polyurethane polymer forms a film containing internal micropores, and that breathability is achieved by communicating the micropores with the film. . However, with this method, there is a limit to the number of micropores per unit area, and in order to obtain sufficient waterproofness, the air permeability must be set to 0.5 ce/m2・s.
It has to be less than ec, and the air permeability has not yet been fully satisfied. Further, in order to uniformly scatter the micropores, the manufacturing condition has a narrow tolerance range and requires a long manufacturing process.

(c) Problems to be Solved by the Invention The present invention solves these technical problems and provides a method for manufacturing a multilayer fabric having well-balanced breathability and waterproofness.

Normally, the water that radiates from the human body includes constantly evaporating water and sweat that accompanies body temperature regulation during exercise. The former is approximately 23 ec/ under comfortable temperature and resting conditions.
m2・hr, the latter is 100 c during intense exercise
c/m2・hr or more. As mentioned above, conventional clothing made of waterproof fabric prevents moisture from the body from being discharged to the outside of the fabric, resulting in high humidity inside the fabric, a feeling of heat, and discomfort. Easy to wake up.

Recently, there are moisture-permeable waterproof fabrics in which a moisture-permeable film is adhered to a woven or knitted fabric, but the breathability is only 0.5 cc/cm2・lee.
Since this is insufficient, the amount of water released to the outside of the fabric is insufficient, and still gives a feeling of heat and discomfort.

An object of the present invention is to provide a method for manufacturing a fabric that has both breathability, breathability, and waterproofness, which are contradictory properties and have been difficult to satisfy at the same time.

(→ Means for solving the problem, that is, the present invention provides a single yarn denier of o, oos to 2.
This method of producing a breathable waterproof fabric is characterized in that a web having a denier of 0 denier and a fiber filling rate of 5 to 30% is treated to be water repellent, and then a knitted fabric is laminated and integrated on at least one side of the web.

The "web" in the present invention may be in the form of a nonwoven fabric such as a nonwoven fabric made from short fibers, a long fiber nonwoven fabric made by laminating melt-spun fibers, or a nonwoven fabric made by needling or punching a carded web. It is not limited. In the present invention, it is particularly preferable to use a fiber obtained by dissolving and removing one component by the melt process, flash spinning, composite spinning, or mixed spinning, which easily yields fibers with a small single filament denier. Although the basis weight of the web is not particularly limited, it is preferably 30 to 120 fi/ln2.

Examples of the fibers constituting such a web include polyester fibers, 4-lyamide fibers, 4-lyamide fibers, polyolefin fibers, rhodan-containing polymer fibers, and polyvinyl alcohol fibers. These fibers can be used alone or in combination. These fibers have a single fiber diameter of 0.005 to 2.0 deniers, preferably 0.01 to 1.0. o
, oos denier less than 1, the strength of the single fiber is low and the handleability during processing is poor. Furthermore, the close contact between the single fibers is large, making it impossible to obtain sufficient air permeability. On the other hand, 2.
If it exceeds 0 denier, breathability will be improved, but sufficient waterproofness will not be obtained.

The fiber filling rate α (/ is the apparent density of the fiber structure, ρ is the true density of the fibers) expressed as (ρ7ρ)xtoo of the web layer is 30≦α≧5, preferably 25≦α≧ 10. In other words, if the fiber filling rate is less than 5%, the fiber gaps will not be large and breathability will be good, but sufficient waterproofness will not be obtained.Furthermore, if the fiber filling rate is less than 30% On the other hand, although it has good waterproof properties, it does not provide sufficient breathability.

The "water repellent finish" in the present invention is applied to the web layer. The water repellent can be applied by the usual methods such as zadding, spraying, dipping, etc. However, if the water repellent has a permeated bed or adhesion spots, pre-treatment with a penetrant may be applied. Adopting a method of applying a water repellent after straining is advantageous in the case of continuous industrial processing because the processing speed can be increased.

If the fiber filling rate of the web exceeds 30%, the fiber filling rate may be reduced to 30 inches or less by rubbing in warm water before the water repellent treatment, and the texture of the web may be improved. If it is hard, the cloth may be softened by mechanical rubbing or liquid rubbing before being treated to make it water repellent. The water repellent may be either a solvent type or an emulsion type, and includes fluororesins, silicone resins, paraffin resins, fatty acid amide resins, and the like. These water repellents can be used alone or in combination.

Furthermore, if necessary, a penetrant and antistatic agent such as Improvil alcohol may be added and used. A sufficient waterproofing effect can be obtained when the amount of water repellent applied is about 1 ts to 10 ts based on the weight of the fiber. Furthermore, after applying a water repellent,
High temperature heat treatment is applied to promote the adhesion of the water repellent to the fibers. The temperature and time of the heat treatment can be appropriately selected depending on the water repellent and the application. A method of applying melt resin and heat bonding, a method of applying an adhesive to either the web layer or the knitted fabric and bonding it under pressure, a method of overlapping the web layer and the knitted fabric and integrating them using a high-frequency welder or ultrasonic waves, etc. Any method may be used, such as a method in which the material is laminated into a sewing thread, or a method in which multiple layers are integrated into a sewing thread.

The knitted fabric to be laminated and integrated with the web is not particularly limited, but it is preferably water-repellent from the viewpoint of waterproof performance, and at least 5 cc/-・s from the viewpoint of breathability.
A knitted fabric with air permeability of ET or higher is preferable. It is desirable to match the thickness and basis weight of the knitted fabric to the intended use, and the texture to the intended use.

(e) Examples Next, the present invention will be specifically explained with reference to the following examples.

Example 1 Single yarn denier 0°02 obtained by one method of Melt Pro
A web of polyethylene terephthalate fibers having a denier and a basis weight of 40 fi/m2 was calendered to obtain a web having a fiber filling rate of 32 inches. This web had a soft feel due to its high fiber filling rate. A normal pressure liquid flow dyeing machine is used to lower the fiber filling rate and soften the texture.

The mixture was rubbed with a liquid stream at a bath ratio of 1:50 at a temperature of 60° C. for 20 minutes, and after dehydration, it was dried at 120° C. for 5 minutes in a Schotruder dryer. After drying, Asahi AG-730 (manufactured by Asahi Glass Co., Ltd.) 5-layer*S water repellent and Ereta, ) 930 (manufactured by Hitoshi Glass Co., Ltd.) antistatic agent 1% by weight and Isozoro・f-Nol 2-layer t-chi ( After soaking in a bath containing a penetrant) and squeezing it uniformly with a mangle at a squeezing rate of 100%,
After drying at 0℃ for 3 minutes, dry at 180℃ using a heat setter for 4 minutes.
Heat treatment was performed for 5 seconds. The fiber filling rate of this web is 1
It was 8% and had a very soft texture.

On the other hand, a thread of 50 denier/24 filaments of polyethylene terephthalate fiber was knitted using a circular loom with a smooth knitting structure and a knitted fabric weight of 2001/ζ2, and was then scoured and dyed in the usual manner, and then processed in the same manner as the web. Has been treated with water repellent treatment. Polyamide is applied to one side of the smooth knitted fabric obtained in this way! Dots of a hot melt adhesive (Delatamide V02P manufactured by Nippon Rilsan Co., Ltd.) were sprinkled in five colors and two dots at intervals of 20 points/1 square inch.

Next, the web and knitted fabric are layered using a heating press machine to create a 3k
Bonding processing was carried out at 140° C. for 20 seconds under a pressure of 1112 g/c. For comparison, a web that had not been subjected to water repellent treatment was also subjected to adhesive treatment in the same manner.

Table 1 shows these performances.

Note 1) Washing time: Home washing machine bath ratio 1:50. Conditions for 41 times (washing with detergent) 2 times Washing with water 5 minutes Rinse 10 minutes Dehydration 10 seconds Note 2) Air permeability: JIS-L-1079 Frazier type tester used Note 3) Water pressure resistance: JIS-L-1079 Water pressure resistance tester Use As is clear from Table 1, the products obtained by the method of the invention had high air permeability and exhibited excellent and durable water pressure resistance. On the other hand, a comparison product whose web was not treated with water repellent treatment had high air permeability but only low water pressure resistance.

The comparative web to which nine knitted fabrics were not bonded developed shimmering during washing and was torn after 11,130 washes.

Example 2 Single fiber denier produced by melt blowing method is 0.0
03.0.005.0.02.0.2, 1.5 and 3.
A 4-liester fiber web with a fabric weight of 35 ji/J, mainly composed of 0 denier fibers, was treated with water repellency under the same conditions as in Example 1, and the 9 knitted fabric was also bonded in the same manner to improve breathability and The waterproofness was evaluated.

Air permeability: 2cc/I for evaluation of inventive product and comparative product
?・Water pressure resistance after 30 washes at see or above is 400WH2
Those that were 0 or more were marked ◎, and the following were marked ×.

'', bottom margin, Table 2 Example 3 A three-dimensionally bonded nonwoven fabric made of special fibers in which 15 ultrafine nylon fibers of O, OS denier are arranged to form a fiber bundle, basis weight 45 l/m2. The fiber filling rate was 3.5.10.
Pressure processing was performed to give a strength of 30 and 40 ts, and water repellent processing was performed in the same manner as in Example 1. Next, the same hot melt resin as in Example 1 was sprayed onto a plain woven fabric with a basis weight of 6097 m2 made of 70 denier/24 filament yarns of nylon 66 fibers, and further bonded to a nonwoven fabric. The breathability and waterproofness were evaluated and the results are shown in Table 3.

Table 3 As is clear from Table 3, the fiber filling ratio within the range of the present invention had a soft feel and showed good results in terms of air permeability and water pressure resistance. On the other hand, Experimental Flat 7 was flexible and had good breathability, but had poor water pressure resistance, and Experimental Flat 11 had a very E-Ya-like texture, making it unsuitable for use in clothing.

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Claims (1)

[Claims] A breathable material characterized in that a web having a single yarn denier of 0.005 to 2.0 denier and a fiber filling rate of 5 to 30% is water-repellent treated, and then a knitted fabric is laminated and integrated on at least one side of the web. Method of manufacturing waterproof fabric.