JPS6113013B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a yarn made of multifilament yarn of thermoplastic synthetic fibers, which can produce knitted or fabric products with a spun-like texture, and a method for manufacturing the same, and more specifically, it relates to a yarn of three or more types with different expansion/contraction elongation rates. The present invention relates to a composite crimped yarn comprising a mixture of crimped yarns of thermoplastic synthetic fibers, and a method for producing the same. Many methods have been proposed to produce filament-processed yarns with a spun-like texture and appearance as part of the development of synthetic fiber materials in the field of knitting and textiles. A spunlike yarn made of a synthetic fiber multifilament yarn that can accurately embody the texture, appearance, stiffness, elasticity, and other characteristics of synthetic fibers has not been found. Conventionally, there have been methods for producing filament-processed yarns with a spun-like texture, such as interlacing filaments with each other or mixing them with other yarns using fluids, electricity, or other physical means, methods using solvents or thermal methods, etc. There is a method of melting or melting all or part of the filament by means. The yarns obtained by these conventional techniques have poor bulkiness and low air content, resulting in a rough and stiff product texture.
It was difficult to provide a soft feel and dimensional stability. Furthermore, there is a method of cutting the filament to generate fuzz, but the yarn obtained by such a method has an amount of cut single yarn per unit length that is an order of magnitude larger than that of a normal spun yarn. Because of the small amount of yarn, it is inferior in air permeability and flexibility, and in addition, it is necessary to add real twist or take other means to give cohesiveness in order to increase the inclusiveness between cut single yarns, which naturally leads to defects that increase costs. ing. Next, composite yarns made by adhering two types of synthetic polymer components with different shrinkage properties in parallel or eccentrically in the fiber axis direction, or single yarns with different finenesses, elongations, and heat shrinkage rates, etc. mixed yarn,
Alternatively, yarn obtained by crimping a single filament made of the same polymer as the polymer constituting the composite yarn, or undrawn yarn or semi-undrawn yarn, There are crimped yarns obtained by false twisting under certain conditions, but these crimped yarns have different crimp forms for the single filaments that make up them, but the overall It is not possible to change the crimp force of each single filament, which governs the crimp force (stretching/elongation rate, etc.), as necessary. Furthermore, since each polymer component or each single filament of the composite yarn receives the same heat treatment effect in the twisted state during false twisting,
When the shrinkage characteristics of the polymer component or each single filament become approximately the same and are used as fabrics, etc.
It has the disadvantage that it cannot sufficiently exhibit the bulkiness and spun-like texture required for the product in the dyeing and finishing process. The present invention provides an extremely novel composite crimped yarn and the composite crimped yarn that can overcome these conventional drawbacks and produce knitted fabric products with bulkiness, spun-like texture, and high elasticity. The object of the present invention is to provide an industrially easy and inexpensive manufacturing method. In general, the higher the number of false twists, the higher the expansion/contraction rate, and the single yarn crimp becomes finer and bulkier. It is natural that they should not leave the area of . Therefore, the present inventors discovered that natural fibers such as cotton and wool have different crimp shapes, and that the differences in crimp shapes give the final product a good texture. In order to obtain a final product with a bulkier and softer spun-like body, we have developed the following structure. That is, first of all, the composite crimped yarn according to the present invention will be explained. The composite crimped yarn of the present invention is a mixture of three or more types of thermoplastic multifilament crimped yarns of the same type or different types with different expansion/contraction elongation ratios. 1
The stretching/elongation rate of the seed crimped yarn Y ₁ is 80% to 250%, and the stretching/expanding rate of the other two or more types of crimped yarns Y ₂ , Y ₃ , Y ₄ ...Y _o is Y ₁ > Y ₂ > It is a composite crimped yarn that satisfies Y ₃ >Y ₄ ...>Y _o and has a stretching/elongation rate of crimped yarn _Yo of 5% to 20%. In addition, the expansion/contraction/elongation rate referred to here is a value measured by the following method. Stretching and elongation ratio = l ₂ - l ₁ / l ₁ × 100 (%) l ₁ : Yarn length at initial load (0.002 g/d) l ₂ : At measuring load (0.1 g/d) of yarn length of l ₁ In other words, the composite crimped yarn of the present invention is composed of three or more types of crimped yarns each having a different stretch/elongation rate. Therefore, when the entire yarn is tensioned, there are crimped yarns whose crimp form is fully elongated, crimped yarns whose crimp form has been elongated to some extent, and crimped yarns whose crimp form has hardly elongated. Because of this mixture, it has characteristics such as bulkiness with high air content, moderate elasticity, and a spun-like texture due to the influence of the crimped yarn that remains in the crimped form. In order to effectively exhibit these characteristics, it is necessary for three or more types of crimped yarns, each of which has a different stretch/elongation rate, to have the maximum difference in stretch/elongation rate, and crimped yarn Y ₁ is usually It is necessary to have the highest expansion/contraction elongation rate of 80% or more obtained by the false twisting method. In this case, if the expansion/contraction rate is less than 80%, the crimp form will be rough, the bulkiness will not be sufficiently exhibited, and the feeling of volume will be poor. Also, 250%
If it exceeds this value, yarn breakage may occur in the normal false twisting process, resulting in poor workability, which is undesirable. On the other hand, in order to make the crimp form of the crimped yarn Y _o the most different from that of the crimped yarn Y ₁ , the expansion/contraction rate is set in the range of 5 to 20%, and the crimped yarns Y ₂ , Y ₃ , etc. are the crimped yarn Y _{1 .} It is sufficient if the expansion/contraction rate is between . If the stretch/elongation rate of the crimped yarn Y _o is less than 5%, it will be in a state similar to that of the original yarn and no crimp will occur, making it difficult to obtain a soft touch, which is not preferable. In addition, in order to increase the difference in the expansion and contraction rates of the crimped yarn Y ₁ and the crimped yarn _Yo , and to bring about different crimpability, the expansion and contraction rate of the crimped yarn _Yo can be set to 20% or less. is necessary. Thus, during weaving and weaving of the composite crimped yarn of the present invention, the crimps of some of the crimped yarns constituting the composite crimped yarn do not disappear due to the inevitable tension applied to the yarn. Since crimped yarns that maintain their original crimped form are mixed in the final product, a knitted fabric product having bulkiness, elasticity, and a spun-like feel as described above can be obtained. Next, to explain the method for manufacturing the composite crimped yarn according to the present invention, the composite crimped yarn is produced in the false twist heating region when three or more thermoplastic multifilament yarns are false twisted and crimped. The multifilament yarns are produced by false twisting the multifilament yarns with different heat receiving effects, and then aligning these yarns. That is, in the method of the present invention, although all yarns are processed with a common false twist number in the false twist crimp process, individual yarns Y ₁ ,
The heat receiving effects of Y ₂ , Y ₃ , Y _{4 ,} . . . _Yo are all different, and as a result, the stretching/elongation rates of the yarns Y ₁ , Y ₂ , Y ₃ , Y ₄ , . . . _Yo are different. Here, the heat-receiving effect refers to the amount of heat that the yarn heated during false twisting receives when passing through a heating region, and the heat-receiving effect is usually controlled by the temperature of the heating element. However, it has been found that even if the temperature of the heating element is constant, the heat receiving effect on the yarn changes depending on the performance of the heating element, and the present invention has been developed by focusing on this point. In other words, the heating element in a false twisting machine usually heats the yarn by running it in contact with a hot plate having a certain curvature, but in addition to changing the temperature, the heat receiving effect can be obtained by attaching a yarn inlet/outlet of the hot plate. This can be easily changed by changing the position of the thread threading guide. Furthermore, there are two types of hot plates, one type is a plate type heater in which the heating part is a flat body, and the other type is a slit type heater in which grooves are provided in the heating part. It is desirable to use a slit type heater in this case, and the degree of contact between the yarn and the heating plate can be adjusted by changing the position of the yarn threading guide, thereby changing the heat receiving effect. That is, when the contact with the hot plate is large, the heat receiving effect of the yarn is large, and the obtained yarn becomes a crimped yarn with a high expansion/contraction elongation rate. The degree of contact here means the sum of the contact length and contact pressure of the thread with respect to the heating body having curvature. In the method of the present invention, three or more types of yarn may be false-twisted using the same spindle on the same machine stand. Three or more types of yarn are threaded separately,
After imparting different heat-receiving effects to the yarns, all the yarns can be led together to the same spindle and the same delivery roller and wound up. Traditionally, Tokukosho
49-11348, Special Publication 50-34668, Real Publication 51-30442
Proposals have been made to split all yarns at the inlet or outlet of the heater, as shown in Figure 3. However, in all of these methods, individual yarns are given only the same heat receiving effect in the heating region; Further, in Japanese Patent Publication No. 50-10974, false twisting spindles and delivery rollers corresponding to the number of divided yarns are required, and the yarns obtained are simply crimped yarns having a fine crimp configuration. Next, to explain a process showing an example of the manufacturing method of the present invention, three or more thermoplastic synthetic fiber multifilament threads are fed by a feed roller, and three or more thread threads provided at the inlet of the heating element are fed. The threads are individually threaded through the guides, and then guided to the heating area, and then threaded separately through three or more threading guides at the exit of the heating element in the same manner as the entrance threading guide, and then threaded through three or more threading guides. The twisted yarns are inserted into the same false twisting spindle, a common number of false twists is applied to all the yarns, and the yarns are taken off by a delivery roller, and all the yarns are aligned and wound. Here, different crimped yarns Y ₁ , Y ₂ are produced by individually changing the positions of the three or more yarn threading guides provided at the entrance and exit of the heating element to vary the degree of contact of each yarn with the heating element. , Y ₃ , Y ₄ ...
_Yo is obtained. In addition, when winding up the crimped yarns Y ₁ , Y ₂ , Y ₃ , Y _{4 .} . . _Yo , the crimped yarns Y1, Y2, Y3, Y4...
By twisting with a gentle twist of 200T/M, parts of the crimped yarn where the crimp form is fully elongated, parts where the crimp form has been elongated to some extent, and parts where the crimp form is hardly elongated are mixed in the cross-sectional direction, resulting in crimps appearing on the surface. The fine crimps with a high expansion/contraction rate and the coarse crimps with a low expansion/contraction rate are random, making it possible to achieve bulkiness and a soft spun-like texture even more effectively. Furthermore, when three or more thermoplastic multifilament yarns are false-twisted and crimped, the composite crimped yarn of the present invention can be false-twisted by differentiating the heat receiving effect on each of the multifilament yarns in the false-twisting heating region. After processing, these threads are aligned,
It is then produced by a relaxation heat treatment. In this way, by performing heat treatment in a relaxed state, the yarns that have the least heat-receiving effect and the lowest expansion/contraction rate shrink more than other yarns, resulting in a yarn length difference and a greater heat-receiving effect. , and the bulkiness of the yarn with a high expansion/contraction elongation rate can be further increased. Although the above description has been made for the case where processing is performed using the same spindle, in the method of the present invention, three or more yarns are made to have different heat receiving effects, and the two or more yarns are false-twisted using two spindles.
It is also possible to align three or more threads between the spindles. Next, the method of the present invention will be explained based on illustrated examples. FIG. 1 is a process schematic diagram showing an example of the method of the present invention, and FIG. 2 is an enlarged view of a main part showing a state in which the yarn in FIG. 1 is in contact with a heater. In FIGS. 1 and 2, the yarn F ₁ pulled out from the package cage is supplied independently from the feed roller 2, and is false-twisted and crimped by the heater 4 and false-twist spindle 6 between the feed roller 2 and the delivery roller 7. and is taken up by the delivery roller 7. On the other hand, the yarns F ₂ , F ₃ , and F ₄ are each pulled out from the package, supplied to a different weight from the yarn F ₁ , and are supplied to the feed roller 2 after being given tension by the collection guide 1 . Ru. Three threading guides 3a, 3b, and 3c are provided at the inlet and outlet of the heater 4, respectively, with different distances from the heater 4. It's getting bigger. Yarn F 2 that has exited the feed roller ₂ is sent to the thread threading guide 3a closest to the heater 4, thread F ₃ is sent to the thread threading guide 3b that is the second closest, and thread F ₄ is sent to the thread threading guide 3b that is the furthest from the heater 4. The three yarns are threaded through the guide 3c, and then the three yarns are combined by the guide 5 and given a common number of false twists to each yarn by the false twisting spindle 6. Different heat-receiving effects are provided by the fibers 4, and the fibers are taken off by the delivery roller 7 as false twisted crimped yarns. Thereafter, the threads F ₂ , F ₃ , and F ₄ are pulled together by the thread F ₁ and the guide 8, and packaged by the winding roller 9 as a composite crimped thread consisting of crimped threads with different expansion/contraction ratios. It is wound up to 10. Further, the thermoplastic synthetic fiber multifilament used in the present invention does not need to be particular about fineness, cross-sectional shape, raster, number of single threads, etc., and can be appropriately selected depending on the product application. Next, the present invention will be specifically explained with reference to Examples. Example 1 Commercially available false twisting machine (HN-82 manufactured by Nippon Spindle Co., Ltd.
Polyester filament yarn 150d was subjected to false twisting using a spindle rotation speed of 20×10 ⁴ rpm, false twisting number of 2502ZT/M, heater temperature of 220℃, feed rate of 2%, and winding rate of 5%. /72f
At the same time, three guides are installed at 5 mm intervals at different distances from the heater hot plate at the heater entrance and exit part of the adjacent weights, and the polyester irregular cross section yarn 50d/ Thread 24f and thread 50d/24f of polyester filament thread into the second closest guide.
Thread polyester filament yarns 30d and 12f through the guide located farthest from the heater hot plate, collect the above three yarns at the top of the spindle, align the three yarns, and perform false twisting on the same spindle. After weaving, the polyester filament yarn 150d/
72f and three crimped yarns were wound together to obtain a composite crimped yarn of the present invention. The stretching/elongation ratio of each filament yarn of the obtained composite crimped yarn was as shown in Table 1. The obtained composite crimped yarn was used as the weft and normal polyester false twisted yarn was used as the warp to make a fabric. Both the warp and weft were compared with a fabric woven using normal polyester false twisted yarn. A soft product with fine loops on the surface was obtained. Furthermore, when the composite crimped yarn of the present invention was twisted at 100 T/M in the Z direction to make a fabric, a product with a soft feel, warmth, and excellent elasticity and resilience was obtained. . Example 2 Commercially available false twisting machine (HN-8 ₂ manufactured by Nippon Spindle Co., Ltd.
spindle rotation speed 20×10 ⁴ rpm, false twist number 2502ZT/M, first heater temperature 220℃, first
Feed rate 0%, cooling zone feed rate 10
%, 2nd heater temperature 215℃, 2nd feed rate 15
%, the winding rate is -20% (however, the ratio to the feed roller just before the winding roller is 5%), the polyester irregular cross-section yarn
150d/30f is usually false twisted, and at the same time, two guides are installed at 5 mm intervals for adjacent weights at different distances from the heater hot plate at the heater entrance and exit.
The polyester filament thread 75d/36f is threaded through the guide closest to the heater heating plate, and the nylon filament thread is passed through the guide closest to the heater heating plate.
After threading the 50d/12f thread and false twisting the 75d/36f and 50d/12f using the same spindle, the 150d/30f threads processed using a separate spindle are pulled together to form a total of three threads. After that, the filaments are entangled with each other by turbulence using a yarn entangling device installed in the cooling zone, and a relaxation treatment (feed rate 15
%, temperature 215°C) to obtain a composite crimped yarn of the present invention. The stretching/elongation ratio of each filament yarn of the obtained composite crimped yarn was as shown in Table 1. When the resulting composite crimped yarn was applied to knitted fabrics, a unique product was obtained that had a crisp feel and also had excellent volume and heathering effects.

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing an example of the method of the present invention, and FIG. 2 is an enlarged view of the main part showing the state in which the yarn in FIG. 1 is in contact with the heater.

Claims (1)

[Claims] 1. Three or more types of thermoplastic multifilament crimped yarns of the same type or different types having different stretching/elongation rates are mixed, and one of the crimped yarns Y ₁ has a stretching rate of
80% to 250%, other two or more types of crimped yarn Y ₂ , Y ₃ , Y ₄
...The expansion and contraction rate of Y _o is Y ₁ > Y ₂ > Y ₃ > Y ₄ ... > Y
_o and the expansion/contraction rate of the crimped yarn Y _o is 5% to 20
% composite crimped yarn. 2. When false-twisting and crimping three or more thermoplastic multifilament yarns, the heat receiving effect on each of the multifilament yarns is made different in the false-twisting heating region, and the false-twisting process is performed, and then these yarns are A method for producing a composite crimped yarn characterized by aligning the threads. 3. The method for producing a composite crimped yarn according to claim 2, wherein the aligned yarns are subjected to a fluid treatment in a relaxed state to entangle the filaments with each other. 4. The method for producing a composite crimped yarn according to claim 2, wherein the aligned yarns are twisted at a twist number of 50 to 200 T/M. 5. When false-twisting and crimping three or more thermoplastic multifilament yarns, false-twisting is performed with different heat receiving effects on the respective multifilament yarns in the false-twisting heating region, and then these yarns are A method for producing a composite crimped yarn, which comprises aligning the threads and then subjecting them to relaxation heat treatment.