JPS6040532B2 - Manufacturing method of specially processed yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a specially processed yarn made of thermoplastic synthetic fiber multifilament yarn.

More specifically, there are three parts: the part fused into the processed yarn, the part peeled off after being fused, and the crimped part.
The present invention relates to a method for producing a specially processed yarn which exhibits a new texture in which a seed shape is produced, the cross section of the constituent filament yarns is flattened, and the side surfaces are irregular. Traditionally, cotton, linen, rayon, acetate, etc. have been commonly used as materials for summer clothing, but in the field of synthetic fibers, due to their lack of moisture absorption and water absorption properties, they have been treated with strong fibers or fused to create a crisp feel. It is well known that materials that provide a refreshing and refreshing feeling have been developed.

Among the methods for fusing, a method of fusing and false twisting thermoplastic synthetic fiber multifilament yarn is generally widely known.

However, this method inherently has the following drawbacks, which are said to be very difficult to overcome. In other words, by fusing some or all of the crimp yarns, the crimp multifilament yarn loses its elasticity and forms arms, which makes the fabric prone to wrinkles. As a result, bulkiness and functionality are lost, resulting in a paper-like touch, and the solidified fusion component partially covers the surface of the monofilament filament yarn, giving it a strong rough and hard feel. Shortcomings have been pointed out.

As a way to improve these shortcomings, limiting the materials and varieties,
Measures such as changing the regular structure of the fabric, interweaving/interweaving, and soft finishing have been taken, but at present none of them have yielded satisfactory results. The object of the present invention is to improve the shortcomings of these conventionally known methods and to provide a method for producing special curled yarn having a new texture.

This purpose is to partially fuse the single longitudinal filaments that make up the filament yarn by heating the thermoplastic synthetic fiber multifilament yarn at a temperature higher than the temperature at which the yarn fuses. In the method of producing a fused and crimped yarn by decoupling and decoupling, after decoupling, a secondary heater performs a modification set, and the yarn immediately after passing through the secondary heater is passed through a hard pressure roller section. This can be achieved by a method for producing a specially processed yarn, which is characterized in that the single fibers of the fused and crimped yarn are exfoliated by being guided and pressed through the yarn, and the cross section of the fiber is flattened and the side surfaces are made irregular.

To further explain the manufacturing method of the specially processed yarn of the present invention, when performing the fusion false twisting process using multifilament yarn, after unraveling, a modification set is performed using a secondary heater, and the yarn is further passed through the secondary heater. Immediately after, the yarn is led to a hard pressure roller member and forced to pass through it, and the partially fused single filament yarn is crushed by the hard roller, thereby separating the spliced portions of the single filament yarns. By partially exfoliating it in an uneven pattern, and flattening the cross section of the single-stitched full filament yarn and making the sides irregular, the fused portion is once fused to the resulting processed yarn. This creates three types of parts: a peeled part and a vertical part, and creates a new texture.

Therefore, according to the method of the present invention, a specially processed yarn with reduced fused portions due to the peeling action can be obtained.
If we were to compare and explain the method of the present invention and the prior art, the first step would be to simply reduce the degree of partial fusion of single fiber filament yarns during false twisting, and achieve the same degree of fusion as the method of the present invention. Compared to the case where we are trying to obtain the degree of adhesion, the coexistence of fused and non-fused areas can vary greatly due to subtle changes in the false twisting processing conditions, making it easier to create uneven adhesion. Since it is a regular curled yarn, it has a "slimy" feel, which makes it difficult to produce a "sharp" effect at the fused part, and there are other problems.
In comparison with the technique described in Japanese Patent No. 592, in which a crepe fabric is produced by weaving a fabric and then partially peeling off the adhesion between the filament yarns, the binding force of the fabric structure causes the fusion bonds within the fabric to be removed. Since it prevents the recovery power of splitting and crimp of the single-filament yarn whose warp has been peeled, sufficient bulkiness and functionality cannot be restored, and the strength of the binding force may cause uneven peeling. This is an unavoidable problem. Although such a problem may be preferable especially when trying to obtain a crepe fabric, it goes without saying that it is inconvenient when trying to obtain a uniform specially processed yarn. That is, in the present invention, the flattening of the cross section of the fused warp yarns and the irregularization of the side surfaces, which cannot be achieved with these conventional techniques, have a great effect on the novelty of the fabric.

In addition, in the method of the present invention, the yarn is forced to pass through the hard pressure roller member at a position immediately after the modification set by the secondary heater, so that it is compared to the case where the pressing and passing action is performed at other positions. As a result, the aforementioned flattening of the cross section and irregularization of the side surfaces of the constituent filament yarns can be achieved very effectively.

That is, for example, in the case where the press passing treatment is performed immediately after the false twisting heater, the peeling and crushing action of the fused portions is not sufficiently performed. The method for producing specially processed yarn of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a process schematic diagram showing an example of an embodiment of the method of the present invention.

An incompletely drawn yarn 1 of thermoplastic synthetic fiber is fed to the feed roller 2 of a normal two-heater type drawn false twisting machine, and while being twisted by the false twisting spindle 4, it is heat set by the primary heater 3, and the yarn is The centers of the single filament yarns are fused concentrically, then decoupled and pulled out from the delivery roller 5. Immediately after being reheated and modified by the secondary heater 6, the hard roller 7 The cheese 8 is then wound up by a winding roller or the like.

In the method of the present invention, the supplied yarn is a multifilament yarn, but monofilament yarn or paper mirror yarn can also be used by pulling the yarn in parallel with the multifilament yarn, wrapping the yarn, or the like.

Furthermore, the use of incompletely drawn yarn is more preferable than the case of using completely drawn yarn in terms of fusion formation, peeling, flattening, and irregularization. Next, as a method for producing fused Kenstriped yarn, fusion false twisting is carried out at a set temperature that is higher than the melting point of the supplied yarn, and in draw false twisting, the draw ratio is adjusted to be higher than the softening point by combining the setting temperature. Any method can be used, such as fusion processing at a set temperature of 100%, or fusion false twisting processing at a temperature higher than the melting point of the low melting point component when two or more components with different melting points are used at the same time. However, the cross-sectional structure of the fused warp yarns is not fully fused, but instead has a fused part and a non-fused part coexisting, with a concentric circular shape where the center is fused, an eccentric shape concentrated in the outer layer, or a dispersion over the entire surface. A preferable structure is a shape such as a shape, and it is necessary to adopt a method of partially fusion bonding. The position at which the hard pressure roller is passed must be immediately after the reheat modification set by the secondary heater as described above.

There are many materials for the hard roller, such as hard rubber, Bakelite, and aluminum, but materials with high hardness such as iron and ceramic are suitable. As for the pressure, the higher the pressure, and the more Islam is allowed to pass through, the better. However, passing the same hard roller once is more effective than wrapping it twice or more. This is done by increasing the pressure per unit area applied to the curled yarn being passed through. The location of the hard pressure roller is usually determined from the equipment point of view.
Within 50 degrees downstream of the end face of the secondary heater, particularly preferably 30 degrees
It is best to place it within the shrine. To explain the processed yarn manufactured by the method for manufacturing specially processed yarn of the present invention, examples of the cross-sectional and side surface shapes of the processed yarn are shown in Fig. 2a,
The model diagram is shown in Fig. b.

When the structure of the specially processed yarn obtained by the present invention is compared with that of conventional products, it has the following features.

In other words, first, the fused single filament yarn is partially peeled off by the pressure of the hard roller (note that in some cross-sectional areas of the yarn, the entire cross-sectional area of the yarn may be peeled off). (Of course, there is), and the peeled portion tends to be uneven, as illustrated in A of FIG. 2A, and has a very special cross-sectional shape. This shape is difficult to obtain not only with conventional false twisting techniques but also with spinning techniques. As a result, the special cross-sectional shape created by the exfoliation of the filament yarn can bring about the recovery of bulkiness, wrinkles, functionality, etc., but the characteristic of this cross-sectional shape is that it exhibits a unique mild "smooth feeling". The next feature is the fused part,
Regardless of the non-fused portion, the cross section becomes flattened and the side surface becomes irregular due to the pressure applied by the roller. Regarding the flattening of the cross section, the fused single fibers are flattened, and the peeled single fiber filament yarns and the unfused single fiber crimped filament yarns are also flattened. As a result, the fused crimped yarn becomes easier to bend, improves wrinkles, drape properties, and paper-like feel, and has a softer texture. Regarding the irregularization of the side surfaces, smooth dent marks are given to the side surfaces of the intersecting single-filament yarns, regardless of whether they are fused or not, as shown in Figure 2b.
As a result, the roughness and hardness of the solidified fused component covering the yarn surface is improved by imparting fine satin-like traces, resulting in a satin-like touch. According to the studies conducted by the present inventors, the number of filaments fused and bonded on the heater with respect to the degree of fusion and the degree of peeling is
If about 1/3 to 1/2 of the filaments are peeled off, a product with a preferable texture can be obtained, and the number of filaments to be fused on the heater is 1/2 to 2/3 of the total number of filaments. Generally speaking, it seems to be better to set it at a certain level.

Examples are described below.

Example: A polyester incompletely drawn yarn of 75 denier and 36 filament yarn was supplied to a two-heater type drawing false twisting machine, with a set temperature of 240oo, a number of false twists of 2800 T/m, and a stretching ratio of 1.8.
Immediately after false twisting was carried out during stretching at a double speed, and then a reheat modification set was performed at an overfeed rate of 116% and a set temperature of 210 qo, the processed yarn was passed through once with an iron roller at a pressure of 3k9 to obtain a textured yarn according to the method of the present invention. Obtained.

Furthermore, for comparison, a conventional fused crimped yarn without using only a hard pressure roller was obtained under the same processing conditions. The evaluation results for these yarns are shown in Table 1.

As is clear from Table 1, according to the method of the present invention, a special textured yarn having improved texture and good properties can be obtained.

In addition, for further comparison, processed yarn was manufactured by placing a hard pressurized loaf immediately after the false twisting heater under the same processing conditions, but it was found that the degree of peeling, flattening of the cross section, irregularity of the side surface, etc. were sufficient. Rather, the processed yarn needed further improvement. Table 1*) The degree of cross-sectional deformation (%) i(1-multi)Xloo is expressed with the long axis of the diagonal of the filament cross section being the end and the short axis being the end 2.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing an example of an embodiment of the method for producing a specially processed yarn of the present invention, and FIG. Similarly, b in the figure is a schematic side view. 1... incompletely drawn yarn, 2... feed loaf, 3... primary heater (false twist heater), 4...
...False twisting spindle, 5...Delivery roller, 6
...Secondary heater, 7...Hard roller, 8...Cheese, A...Concave and convex portion. Diagram O1 Spear Z diagram

Claims (1)

[Claims] 1. A thermoplastic synthetic fiber multifilament yarn is heated at a temperature higher than the temperature at which the yarn fuses while being stretched to partially fuse the monofilament filaments that make up the filament yarn, and then de-stripped. In the method for producing fused and fused yarn, after unraveling, a secondary heater performs modification setting, and the yarn immediately after passing through the secondary heater is guided to a hard pressure roller member and pressed. A method for producing a specially processed yarn, which comprises at least exfoliating the single fibers of the fused and curled yarn, flattening the cross section of the fibers, and making the sides irregular.