JPH0255546B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a fabric made of a false-twisted layered yarn. In recent years, by aligning or interweaving low-oriented yarns and highly-oriented yarns, or by interweaving them and performing a false twisting process, the low-oriented yarns are wound around the highly oriented yarns, resulting in false-twisted two-layer fabrics. Methods for obtaining structural threads are known. Products obtained using this yarn are expected to have a spun-like feel due to their uniform appearance and excellent bulk. However, the texture of fabrics made from the above-mentioned false-twisted two-layer yarns lacks firmness, making it difficult to obtain a refreshing texture especially for spring and summer. They are either fused or glued together, or processed with thermosetting resin, but the texture is unrefined, lacks repulsion, and emphasizes the hardness of the earth, so the texture is not always desirable. It is difficult to say that this is the case, and its true practical value as a textile has not been realized. The purpose of the present invention is to improve such problems, to have a texture that is rich in refreshing feeling, elegant silky feel, and has a feeling of firmness for all seasons, and in addition to excellent repulsion properties, The purpose of this paper is to propose a method for manufacturing a fabric with a false-twisted layer structure that has added flexibility and smoothness. That is, in the present invention, the sheath yarn is S-twisted and Z-twisted around the core yarn.
In the production of a fabric consisting of a core-sheath-like false twisted layer structured yarn which is wound in an alternating manner in the twisting direction, a polyester multifilament yarn is used as the core yarn of at least the false twisted layer structured yarn, and A method for producing a fabric made of a false-twisted layer-structured yarn, characterized in that the false-twisted layer-structured yarn is subjected to additional twist satisfying the following formula, then woven, and the fabric is treated with an alkali, further comprising the steps of: After the treatment, a processing treatment using a silicone resin makes it possible to further improve the texture. Here, the additional twisting conditions are: 21000/√Dc≧T≧3500/√Dc However, T...number of twists per 1m (T/m) Dc...thread denier (de) of the core yarn is satisfied. It is something. The present invention will be explained in detail below. The false twisted layer structure yarn used in the method of the present invention is a core-sheath layer structure yarn in which sheath yarns are wound around a core yarn in an alternately reversed manner in the S twist direction and the Z twist direction. thread,
Preferably used is one in which two to three layers of sheath threads are arranged concentrically. A yarn with such a structure can be obtained by a known method, for example, by using a highly oriented yarn for the core yarn and a low oriented yarn such as an undrawn yarn or semi-drawn yarn for the sheath yarn, It is obtained by aligning or intertwining the fibers and then subjecting them to false twisting. Further, the fiber used for the core yarn needs to be a polyester multifriment yarn with excellent texture and good repulsion properties. Further, for the core, a yarn with a higher orientation than the sheath yarn is used, but it is not limited to drawn yarn, and a combination of semi-drawn yarn and semi-drawn yarn, or a combination of semi-drawn yarn and undrawn yarn can be used. Next, the mixing ratio of the core yarn and sheath yarn is such that the core:sheath ratio is 7:3 to 4:6, which is effective in maintaining a firm feeling and preventing a fluffy texture. Also, the difference in yarn length between the core yarn and sheath yarn is 5 to 70%, but for the same reason as the mixing ratio, the yarn length of the sheath yarn is about 10 to 25% longer than that of the core yarn. It is more preferable to use If the yarn length difference is less than 5%, it is difficult to obtain a core-sheath layer structure yarn that is alternately reversed and wound in the S-Z twist direction, and if it exceeds 70%, the sheath yarn will have a triple-wound structure. This is undesirable because the core yarn and the sheath yarn have a real twist in the triple-wound structure and form a single structure, so it is considered that the method of the present invention does not have the effect. In order to obtain a layered yarn with such a difference in yarn length, the first
As shown in the figure, a core yarn 1 and a sheath yarn 2 are each supplied to a first feed roller 3, and an interlacing device 4
The core yarn and sheath yarn are mixed and entangled. Then the second
It can be obtained by applying false twist while stretching between a feed roller 5 and a delivery roller 6, and heat setting with a heater 7. Reference numeral 8 denotes a false twisting device, and the yarn passed through the delivery roller 6 and wound into a winder 9 is obtained as a composite textured yarn with a two-layer structure in which a sheath yarn is wound around a core yarn. FIG. 1 is a process diagram of the false twist crimp process for producing the false twist layer structure yarn used in the present invention. The yarn thus obtained has a sheath yarn of S as described above.
It has a core-sheath-like structure that is alternately reversed and wound in the twist and Z twist directions, but since there is no twist in the core yarn, if it is made into a woven fabric as it is, it will lack a firm feel and will not have a refreshing feel. It has a firm texture and does not have a stiff texture. Therefore, it is necessary to apply a twist within the range of the formula described above, but in this case, due to the structure of the false-twisted layer structure yarn, the twist state is different between the core yarn and the sheath yarn, and the tendency is for the core yarn to twist more. is concentrated. If the number of twists does not satisfy the range of the above formula, the object of the present invention cannot be achieved. In other words, if the number of twists is less than the range of the above formula, the conventional drawbacks will not be improved and the twisting will not be effective, and conversely, if the twist is applied beyond the range of the above formula, the texture will be hard. Moreover, the characteristics of the false-twisted layer structure yarn cannot be utilized. Note that the number of yarns constituting the false twisted layer structure yarn is not limited to two, but may be three or more types, and the layer structure is not limited to double, but may also be three or more. Next, the false twisted layer structure yarn is woven and treated with an alkali, but there are no particular limitations on the structure during weaving. Generally 5% to 20% for alkali treatment
A moderate weight loss rate is appropriate. If it is less than 5%, the texture will be hard, and if it is more than 20%, the repellency will decrease, and the strength, particularly tear strength and slip strength, may decrease depending on the purpose and structure of the treated fabric. Based on the above, it should be set at about 20% at most. This alkali treatment can be carried out by methods used for ordinary textiles, such as heat treatment of the raw fabric, dissolving chemical treatment, water washing (including scouring, but scouring may be applied to the raw fabric), dyeing (or dyeing). (1), drying, finishing setting, etc. For example, when using caustic soda as the alkali, use a 0.5 to 30% aqueous solution of caustic soda at a temperature of 50 -
Treatment at 100℃ for about 20 minutes to 3 hours is sufficient. As described above, according to the present invention, the characteristics of the false-twisted multilayer structured yarn with the optimized core/sheath ratio, core/sheath yarn length difference, etc. This solves the problems of insufficient repulsion and insufficient ground compaction. That is, the false twisted multilayer structured yarn used in the present invention is twisted to improve soil compaction, but at this time, the twisting range is limited because the twist tends to concentrate in the core due to the structure of the yarn. In addition, the repellency becomes increasingly poor due to the twist concentrated in the core, so we treated it with alkali to reduce the amount of polyester in the core yarn, reduce the contact pressure between the fibers, and give appropriate repulsion. It is. Furthermore, by applying a silicone resin after the alkali treatment, excellent flexibility, smoothness, and improved repellency can be added to the fabric. In applying the silicone resin, generally a dry method using a known silicone emulsion or a wet method using an organic solvent solution is applied. The silicone resin may be an emulsion containing general silicone oil for textiles, but
In order to improve durability against washing, it is desirable to use fiber crosslinking agents, such as combinations of dimethylpolysiloxane emulsions and modified polyethylene emulsions, dimethylpolysiloxane nonionic compounds, and highly polymerized organopolysiloxane nonions. Emulsions, organopolysiloxane weak anion emulsions with a high degree of polymerization, and the like are preferably used. Such silicone resin has a dry weight of 0.2 to 3.0, preferably 0.3 to 2.0 weight (wt) relative to the fabric.
% range. 0.2
If it is less than 3.0% by weight, flexibility and smoothness will be poor, and if it is more than 3.0% by weight, the texture will deteriorate, so it is not suitable. In addition, all of the silicone resins mentioned above are hydrophilic and impart appropriate hygroscopicity to the resulting fabric. Incidentally, as the fiber used for the sheath thread, polyamide, acrylic, and other fibers can be used as long as there is a multifilament thread, but polyester may also be used. When low-oriented polyester is used for the sheath yarn, the low-oriented polyester produces wedge-shaped cracks in the direction intersecting the fiber axis due to alkali treatment, and the wedge-shaped cracks act as an anchor effect during the resin processing. This is useful for improving its durability. Hereinafter, the present invention will be explained by giving examples. (Example) 225 denier, 72 spun at a spinning speed of 1800 m/min
Filament polyethylene terephthalate undrawn yarn and 225 denier spun at a spinning speed of 3000 m/min.
A 30-filament undrawn polyethylene terephthalate yarn was interlaced (2 kg/cm ² ) using the process shown in Figure 1, and then stretched at a drawing ratio of 1.58, D/
Stretching and false twisting were performed at Y2.06, temperature of 190°C, and processing speed of 390 m/min. The obtained yarns were twisted at 1300T/M and 700T/M to weave the fabrics shown in Table 1, respectively, and the yarns were woven under the conditions shown in Table 1.

[Table] Next, this fabric is refined and preset (180℃ x 45℃)
After that, alkali treatment was performed. (Alkali weight loss) NaOH concentration: 35g/bath temperature: 98°C Weight loss time: 30 minutes Weight loss rate: 9.7% After the alkali treatment, the dyed fabric is silicone, a weakly cationic emulsion whose main component is organopolysiloxane with a high degree of polymerization. The fabric was soaked in a 0.5 aqueous solution of the resin, and then squeezed to a pick-up rate of 70% based on the weight of the fabric. Next, after drying at 100°C for 3 minutes, heat treatment was performed at 160°C for 30 seconds, and the results shown in Table 2 were obtained.

【table】

【table】 [Brief explanation of drawings]

FIG. 1 is a process diagram for producing the false twisted layer structure yarn used in the present invention. 1... Undrawn yarn for forming the core yarn, 2... Undrawn yarn for forming the sheath yarn, 8... False twisting device.

Claims (1)

[Claims] 1. In the production of a fabric made of a core-sheath-like false twisted layer structure yarn in which sheath yarns are wound around a core yarn in an alternating manner in the S-twist and Z-twist directions, at least A polyester multifilament yarn is used as the core yarn of the false-twisted layer structure yarn, and the false-twisted layer structure yarn is made of a sheath yarn having a yarn length 5 to 50% larger than that of the core yarn. After applying additional twist to the structural yarn that satisfies the following formula,
1. A method for producing a fabric made of a false-twisted layer structure yarn, which comprises weaving the fabric, treating the fabric with an alkali, and then processing the fabric with a silicone resin. 21000/√Dc≧T≧3500/√Dc However, T...Number of twists per meter (T/m) Dc...Thread denier (de) of the core yarn 2 Claim No. 2 in which the silicone resin is a hydrophilic resin The method described in Section 1.