JPS6142023B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a breathable waterproof knitted fabric using polyester multifilament. Traditionally, in order to impart waterproofness to knitted fabrics,
Methods of coating the surface of knitted fabrics with synthetic resin, adhesion, or impregnation with organic solvents are known, but waterproof products with synthetic resin coated on the surface of knitted fabrics have poor breathability and become difficult to wear when worn for long periods of time. This prevents sweat from dissipating, causing discomfort to the wearer, which is a major disadvantage when worn. On the other hand, waterproof products in which a water-repellent resin is adhered to the surface of a knitted fabric have breathability, but have the disadvantage that their water-repellent properties do not have washing durability or do not have a high degree of water-repellency. In addition, waterproof products made by impregnating the fibers with water-repellent resin using organic solvents have excellent breathability and durability against washing. have. The present invention improves these drawbacks and
The purpose of the present invention is to easily provide a highly waterproof knitted fabric that is breathable, has excellent durability, and is highly waterproof. That is, as a result of intensive studies, the present inventors have developed a polyester multifilament that satisfies 0.5<Dr/fc<2.5 (Dr is the filament denier after winding, and fc is the number of filaments after winding) as shown in the drawing. False twist number 35000/√ in different directions
False-twisted yarn is false-twisted at 45,000/√, then pulled and rolled at the same time, and has a crimp degree of 55 to 65. When treated with hot water at 100℃ or higher, the yarn shrinks by 20% or more in both the weft and weft directions. It is knitted and then dyed. In this dyeing process, processes such as relaxing at high temperatures (100 degrees Celsius or higher) or no presetting that can cause crimp of the false twisted yarn and shrinkage of the knitted fabric in the warp and warp directions by at least 20%, etc. Conditions are desirable, especially
Processing at 100℃ or higher is desirable. The inventors
By applying a water-repellent treatment to the knitted fabric obtained in this process without changing its dimension as much as possible, it is possible to obtain a knitted fabric that has a high degree of waterproofness and has the elasticity and breathability inherent to knitted fabrics. Successful. Note that the water repellent is not particularly limited, and any commercially available resin such as silicone may be used to achieve sufficient effects. In the present invention, the reason why textured yarns that have been falsely twisted in different directions are simultaneously wound and used is to reduce the mutual torque of yarns with many crimps, thereby increasing the stability of the yarn form and thus of the knitted fabric. It is for the purpose of Furthermore, the reason why separately false-twisted yarns are intentionally pulled together at the same time to form a single yarn is to obtain a higher number of crimps. In order to increase the waterproofness of a knitted fabric, the higher the density of the knitted fabric, the better, so the higher the number of false twists (crimps), the better, but if the stability of the yarn is taken into consideration, the number of false twists is 35000/√ It has been found that ~45000/√ exhibits effective waterproofing properties. In addition, the denier of the single fibers used is closely related to the knitted fabric density, and when the number of false twists is held constant, the apparent density increases as the denier of the single fibers becomes thinner.
When considering the stretch back of the knitted fabric, 0.5 dr
is the limit of thinness, and if it is 2.5 dr or more, the waterproof effect is insufficient. On the other hand, the washing durability of waterproof performance is
How the density of the knitted fabric is maintained during washing, in other words, depends on the degree of crimping. Generally, the higher the crimp strength, the greater the washing durability, but when considering false twisting workability and texture for clothing, 65 is the limit, and if it is less than 55, durability is poor. The crimping degree is 10,000 dr under a tension of 0.05 g/dr to make a small skein, which is then immersed in hot water at 90° C. for 30 minutes.
Measure the length of the skein under an initial load of 10 g and call it l ₀ .
Next, check the skein length after 30 seconds while applying a load of 1 kg.
l Measure ₁ . A value of l ₁ −l ₀ /l ₁ ×100 was defined as the degree of crimp Kenro. The above has described the relationship between waterproofness and durability in a microscopic manner with a focus on false-twisted yarns, but knitted fabrics with a high degree of waterproofness cannot be obtained even if the textured yarns are knitted without limit and dyed. I can't. That is, in order to provide a product with breathability, stretchability, and a high degree of waterproofness, the processed yarn must be knitted and dyed and finished in such a way that the crimp characteristics of the processed yarn are fully exhibited during the dyeing process. As a result of repeated experiments, the inventors found that at least
The knitted fabric is knitted so that it shrinks by 20% or more in both the weft and weft directions through hot water treatment at 100°C, and then the knitted fabric shrinks by 20% in both the weft and warp directions during a series of dyeing processes such as relaxation and dyeing.
It was confirmed that a knitted fabric having breathability and a high degree of waterproofness can be obtained by shrinking the knitted fabric as described above and subsequently applying a water repellent treatment without changing the dimensions of the obtained knitted fabric. Generally, in circular knitted fabrics, it is difficult to obtain a shrinkage rate of 20% or more in the warp direction due to the knitting structure, but by using the above processed yarn, a shrinkage rate of 20% or more can be easily obtained. It goes without saying that the knitted fabric according to the present invention is not limited in its uses, and can be used in a wide variety of applications, from inner garments to outer garments. The present invention will be explained in more detail with reference to Examples. Example The following table shows the false twisting conditions of the processed yarn used, the dyeing process, the knitted fabric shrinkage rate in the process, and the water pressure resistance according to JIS L-1079.
The results of the evaluation are shown below. Experiment number (1), (2)
is the product of the present invention, and (3), (4), and (5) are comparative examples.
In addition, the shrinkage rate in the table is the shrinkage rate for gray fabric.

【table】

[Table] As can be seen from this result, the water pressure resistance of knitted fabrics (1) and (2) according to the present invention changes before and after washing compared to comparative knitted fabrics (3) to (5). It can be seen that the material has excellent waterproof properties, with very little air permeability. This is because this result satisfies all of the above configurations of the present invention.

[Brief explanation of the drawing]

Fig. 1 shows an example of manufacturing the false twisted yarn used in the present invention, where A and A' are supply yarns, 1 and 1' are delivery rollers, 2 is a false twist heater, and 3 and 3' are is a spindle, 4 and 4' are second rollers, and 5 is a winding roller.

Claims (1)

[Scope of Claims] 1. Polyester filament processed yarn having crimp properties expressed by the following formula, which is false twisted in different directions and simultaneously pulled and rolled, is treated with hot water at 100°C or higher in both the weft and weft directions. A waterproof knitted fabric characterized by being knitted to shrink by 20% or more, then dyed under conditions to shrink by 20% or more in both the warp and weft directions, and then subjected to water-repellent treatment without changing the dimensionality of the knitted fabric. manufacturing method. 35000／√＜K＜45000／√ ………(1) 55≦K ₁ ≦65 ………(2) 0.5＜Dr/fc＜2.5 ………(3) However, Dr……filament denier of winding thread K...Number of false twists K ₁ ...Number of crimps of the winding yarn fc...Number of filaments of the winding yarn