JPS59106560A - Modification of sheet like article - 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 The present invention provides a method for modifying a sheet-like material in which a sheet-like material having a heat-shrinkable thermoplastic synthetic fiber knitted structure or a raised surface is partially modified in a predetermined pattern. It is related to.

Generally, two knits/woven fabrics are made side by side by soaking the knitted fabric using one-strong yarn in water or water to which a small amount of synthetic detergent or alkali has been added and giving it a kneading effect, that is, a relaxing scouring process (4) 1 This is done by using the untwisting action of natural yarn to create shrinkage on the fabric surface. The size of the wrinkles.

The density depends on the number of twists of the highly twisted yarn, the thread density, the fabric, the type of fiber, etc., but it also varies depending on the temperature of the wrinkle solution and the kneading action. Generally, when the temperature of the solution is high and wrinkles form rapidly, the wrinkles are large. When the liquid temperature is low and a kneading action is applied, wrinkles tend to be smaller and more numerous. Therefore, in order to control the formation of wrinkles, a method has been adopted in which, prior to creasing, the material is pressed between two rolls with a line pattern or an irregular pattern of an arbitrary shape to form a pattern.

In addition, when stamping predetermined letters or figures on the raised parts of bankskin-style synthetic leather or triacetate yarn, heated rollers or decks are used to form the desired shapes on the sheet surface.

However, molding using a roller or the like has its own limitations, and there are many aspects of molding that are impractical in terms of diversification of patterns and efficiency, and improvements are desired.

In view of the current situation, the present inventor has conducted intensive research and found that if the direction of the laser beam and the density of thermal energy are appropriately controlled, synthetic fibers have good selective absorption properties, so that only the laser irradiation area can be used. The present inventors have discovered that it is possible to selectively cause a required thermal change, and have completed the present invention.

That is, the first object of the present invention is to irradiate a predetermined dot-like or linear pattern with a laser beam while optically controlling it, and to cause a thermal change in the irradiated area. Thermal shrinkage or untwisting occurs inside the tissue, which is intended to be used for regulating the way it is lined up.

2. The second object of the present invention is to diffuse laser light and irradiate it through a light-shielding plate with a predetermined pattern cut out to modify its surface properties. It is an attempt to express images such as.

The above thermal modification effect of laser irradiation is effective on heat-shrinkable fibers such as polyester, regardless of the texture, such as plain weave, twill weave, or satin weave, and regardless of whether it is highly twisted or non-twisted. Since this is a common phenomenon, it can be applied to both of these knitted fabrics. 9 Heat-shrinkable/thermoplastic fibers to which the present invention is applicable include polyester fibers as well.

Most conventionally known synthetic fibers such as diacetate and triacetate may be used.

2. Synthetic fibers may be either natural or non-twisted; however, in the case of 2. highly twisted fibers, disintegration is suppressed in the laser irradiation area by heat fixation, and in the case of non-twisted fibers, Since shrinkage is suppressed, a difference in shrinkage occurs between the laser irradiated area and the non-irradiated area by subsequent relux scouring.

Various types of lasers may be selected, but
Gas lasers, especially co2 lasers, are preferred.

The irradiation pattern may be controlled into a predetermined dot-like or linear pattern using conventional sputtering and optical path changing techniques.

When applying relaxation refinement, it may be performed in a normal manner. Usually, after relaxing scouring, dyeing is applied.

The above is an example of structure modification, but when performing two-surface modification, it is preferable to diffuse the laser light and irradiate it through a light-shielding plate having cutouts in a predetermined pattern.

Conventional optical means using convex or concave lenses may be used to diffuse the laser light, and the light shielding plate is preferably manufactured using stainless steel or the like.

The present invention will be described in detail below based on nine embodiments thereof.

Example 1 (Usage for li!i stand) ■ Identification of textiles Highly twisted and non-twisted products of Toshi Co., Ltd. (trade name: Palace Crepe (polyester thread fabric)) were used as samples.

■ Laser used: Nippon Laser Co., Ltd. LAAKMANN RF160 CO
Assemble as shown in Figure 1 using two lasers. In the drawings, reference numeral 1 denotes a pedestal that supports a C02 laser 2 so as to be movable up and down relative to a turntable 3. The Raychi light is emitted from the lens 4. In this example, the distance to the sample is 12
An, the laser power used was 18W.

(2) Laser Irradiation As shown in FIG. 2, a plurality of laser irradiation areas B were formed at parallel intervals along the edge A of the woven fabric W. Note that the laser irradiation time is such that the irradiation line per 10 cm in length is scanned in 5 to 10 seconds.

■ Relax scouring braiding conditions: 98°C temperature for 90 minutes Processing liquid Sunmol BL-500' Ig/A caustic soda
0.5g/β sodium tripolyphosphate
0.5g/β ■ Dyeing Dyeing conditions: Temperature 135°C Time 30 minutes Conventional dyeing Dia
nix Black (manufactured by Mitsubishi Kasei Corporation: Disperse dye) ■Results A: For 8-strongly twisted materials, untwisting in the irradiated area is suppressed, causing a shrinkage difference between that area and other areas, resulting in wrinkles. was formed.

In the case of the untwisted material, the laser irradiation area was partially heat set, and wrinkles were formed there by the subsequent relaxing scouring.

C. Laser irradiation did not have any negative effects on the dyeing process, and on the contrary opened up the possibility of obtaining products with interesting designs.

Example 2 ■ Specification of Sheet-like Material A synthetic leather mainly made of triacetate and having a fluffy surface was used as a sample.

■ Laser use device: Use the same device as that used in Example 1. However, it was assembled as shown in Figure 3.

(2) Laser Irradiation As shown in FIG. 4, a laser beam diffused through the light shielding plate 5 was irradiated for 8 seconds to melt the portion 7 corresponding to the punched letters 6 on the raised surface of the light shielding plate 5.

■Results A clear pattern was formed between the irradiated area and the light-shielded area, and there was no browning on the irradiated area, giving it a strikingly beautiful appearance.

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic diagrams of an apparatus for implementing the method of the present invention, and FIGS. 3 and 4 are explanatory diagrams showing laser irradiation patterns according to the method of the present invention. 1 - mount, 2 - CO2 laser, 3 - turntable, 4 - lens, 5 - light shielding plate. Patent applicant Emori Shoji Co., Ltd. Agent Patent attorney Koji Toyo Figure 1-F-

Claims (1)

[Claims] ■ When partially modifying a sheet-like material made of heat-shrinkable thermoplastic synthetic fiber yarn with a predetermined pattern, a laser beam is focused on the sheet-like material to form dots. Alternatively, a method for modifying a sheet-like material, which comprises irradiating with a linear irradiation pattern and modifying the irradiated area by selectively changing heat. ■ A claim in which the tissue in the laser irradiation area is modified so as to be heat-fixed and parallel control is applied, followed by relaxing scouring ■
modification method. ■ The modification method according to claim ■ or ■, wherein the synthetic fiber is polyester. ■ When partially modifying the surface of a sheet-like material having a heat-shrinkable raised surface with a predetermined pattern, a laser beam is diffused onto the sheet-like material and passed through a light-shielding plate having predetermined cut-out characters or figures. 1. A method for modifying a sheet-like material, the method comprising: irradiating a sheet-like material with heat and selectively changing the irradiated area with heat to modify the material. (2) The modification method according to claim (2), wherein the modification is carried out so as to melt and erase only the naps in the laser irradiation area to achieve a desired shape. (2) The reforming method according to claim (2), wherein the sheet-like material is a raised product 1 synthetic leather using triacetate yarn, and which has fluff formed on its surface.