JPS6119736B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a polyamide-based synthetic multifilament false-twisted yarn that has a texture and appearance similar to natural fibers, and a method for producing the same. The present invention relates to a false twisted yarn suitable for providing a synthetic multifilament woven or knitted fabric and a method for producing the same. Conventionally, polyamide-based synthetic multifilaments have excellent color development and are useful materials for clothing, but their texture gives a so-called slimy feel, making them inferior to polyester filaments in many aspects. The situation continues to change. However, in today's world where it is necessary to make clothing more fashionable, polyamide, which has excellent color development, can be made into a material as useful as polyester by changing its texture.From this point of view, the present inventors et al. earlier filed Japanese Patent Application No. 77276 (1972)
2624) and Japanese Patent Application No. 70736 (1983)
No. 6943), and showed that the purpose could be achieved by generating a large number of fuzz in the false twisted yarn and creating a core yarn structure, respectively. The present invention has further improved the false twisted textured yarn of polyamide-based synthetic multifilament in this regard.
They discovered that the objective could be achieved by blending different types of yarns, leading to the present invention. That is, the first invention of the present invention provides yarns F ₁ and 3 in which the single filament fineness of the constituent filaments is 1.5 denier or less.
It is a polyamide-based synthetic multifilament false-twisted yarn in which filaments F ₂ of denier or higher are mixed in the following weight ratio, most of the filaments of F ₁ are in a bundled state, and F ₂ twists F ₁ into a helical shape. It has a surrounding structure and is resistant to acid dyes along the entire yarn length.
The gist is a polyamide-based synthetic multifilament processed yarn characterized in that the dyeing ability of F ₂ is greater than that of F ₁ and the degree of entanglement is 10 strands/m or less, 40≦F ₁ weight / (weight of F ₁ + weight of F ₂ ) × 100≦60 (%) The second invention provides yarn U 1 with a single filament fineness of 1.5 denier or less and yarn U ₂ with a single filament fineness of 3 denier or _more after drawing. Undrawn yarns of two types of polyamide-based synthetic multifilaments whose difference in elongation at break satisfies the formula below are drawn together so that the weight ratio satisfies the formula below, and the yarns are drawn and simultaneously false-twisted. A polyamide-based synthetic mulch characterized by adjusting the stretching ratio to 0.90 to 0.95 times the specific stretching ratio of U ₁ and performing air entanglement treatment at an air pressure of 2 kg/cm ² or less just before winding. The gist of this paper is a method for producing filament-processed yarn. 30≦Cutting elongation of U ₂ - Cutting elongation of U ₁ ≦100 (%) ... 40≦Weight of U ₁ / (Weight of U ₁ + Weight of U ₂ ) × 100≦60 (%) ... Invention will be explained in detail below. First, in order to improve the feel of knitted fabrics made of polyamide, it is necessary to give the threads a non-periodic mottled structure.
In addition, by mixing single yarns with a fineness of 1.5 denier or less and a single yarn with a fineness of 3 deniers or more, it is possible to have a firm yet soft touch. What is important in this case is that it is not very effective to completely integrate the two, and most of the multifilament yarns with a single filament fineness of 1.5 denier or less form a core structure in a bundled state, and The purpose is to surround the core in a helical pattern with a multifilament having a single yarn fineness of . When the yarns are tensed, the two appear on the surface as if they were alternating and asynchronous yarn lengths. Note that "most of the filaments of F ₁ are in a focused state" here refers to a state where 90% or more of the filaments of F ₁ are focused, and when the focusing rate of F ₁ is less than 90%, the helical state is surrounding F ₂
This is not preferable because the multifilament of _F1 is covered and hidden by the filament of F1, making it impossible to express the dull color tone described below. Furthermore, in the present invention, both F ₁ and F ₂ are used in knitted fabrics by increasing the dyeing ability of acid dyes, that is, the dyeing ability of thick denier single yarn. When they are lined up side by side, after dyeing, they appear on the surface as scratch-like spots, which are very beautiful.
A knitted fabric with high fashionability can be provided. Regarding the composition of the single yarn denier, one yarn needs to be 1.5 denier or less to give a soft texture, and the number of filaments must also be at least
It is desirable to have 20 or more. In addition, the other thread to be mixed in order to provide tension needs to be at least 3 denier or more single thread, but one that is too thick is not suitable for clothing, and up to 10 denier
The denier is the limit, and the number of filaments is also required to be at least 5 or more. The mixing ratio of both is preferably 1:1 by weight, but
Depending on the composition of the single yarn denier, changes within ±10% can be given. That is, it is necessary to satisfy the following: 40≦Weight of F ₁ / (Weight of F ₁ + Weight of F ₂ )×100≦60 (%). In this case, if the mixed ratio of F ₁ is less than 40%, F ₂ with thick fineness becomes dominant and the texture becomes rough and stiff.
On the other hand, when F ₁ exceeds 60%, F ₁ becomes dominant and the characteristics of F ₂ cannot be utilized, resulting in a loose texture and a dull tone due to the difference in dyeing ability between the two. will also decrease. Next, when producing knitted fabrics using the yarn of the present invention, guides, tension compensators, etc. are used, so it is desirable that the yarn as a whole has cohesion. As a means for imparting properties, air entanglement treatment as shown in US Pat. No. 3,115,691 is desirable. However, if this is done excessively, although it is useful for the purpose of improving the convergence of the threads, it has the effect of eliminating the non-periodic mottled structure referred to in the present invention, and on the other hand, it eliminates a large number of intertwined parts. By giving it to the yarn,
For example, when it is implanted as a weft of a plain woven fabric, the intertwined portions come together between the parallel yarns, resulting in moiré-like irregularities appearing as a whole, which is not preferable. Therefore, it is necessary to provide only a slight degree of convergence that does not cause any problems in the process of making knitted fabrics, and the degree of entanglement must be
It is desirable to keep it within 10 strands/m, preferably within 5 strands/m. The degree of entanglement is measured by immersing the yarn in a hot bath at 60°C without tension, reading the number of intertwined parts, and measuring the number per original length under a tension of 1 g/d. Next, a method for producing the yarn of the present invention will be explained. First, a polyamide-based synthetic multifilament undrawn yarn U ₁ with a single filament denier of 1.5 denier or less after drawing and an undrawn yarn U ₂ with a single filament denier of 3 denier or more after drawing, the difference in elongation at break between the latter and the former is 30 ~ 100%
Prepare two pieces of paper, pull them together, and simultaneously stretch and false-twist them. In this case, the method of providing a difference in elongation between the two may be, for example, by changing the spinning conditions such as the spinning speed, or by changing the stretching conditions such as partial stretching. The elongation of thick denier yarn is more than 30% higher than that of fine denier yarn, up to 100%.
It is important that the elongation difference between the two does not exceed %.
If it is 30% or less, when false twisting is applied at the same time as stretching,
The two are mixed together and do not meet the purpose of the present invention. Moreover, if it exceeds 100%, the difference in yarn length between the two becomes significant, making it difficult to knit or weave the resulting yarn due to loops and slack, which is not preferable. This undrawn yarn has a mixing ratio of U ₁ in terms of weight ratio.
In this case, the stretching ratio is set to the specific stretching ratio of fine denier single yarn U ₁ (normal cold stretching method). and set the stretching ratio to 0.90 to 0.95 times (to achieve a cutting elongation of 38%). The reason for this is that undrawn yarns, especially those with low orientation (spinning speed 2000
m/min or less), if the stretching ratio is increased to the specific stretching ratio, the deformation of the yarn during false twisting at the same time as stretching may be large, resulting in a large number of single yarn breakages.This should be prevented. is the purpose. but,
If it is too low, especially if it is less than 0.90 times the specific draw ratio, depending on the number of twists, the tension balance during false twisting cannot be maintained and yarn breakage will occur, which is undesirable, but stable processing is possible up to a maximum of 0.95 times. Become. Other conditions such as the number of false twists and heater temperature may be the same as those employed in ordinary stretching and simultaneous false twisting, and any twisting means such as pins or friction may be used. In this drawing/false twisting process, the fine denier single yarn U ₁ is almost completely drawn due to the elongation difference between the two yarns, and as a result of applying sufficient tension, it is constantly present in a concentrated state at the center of the yarn. Thick denier single yarn U ₂
Since the yarn is insufficiently drawn, no tension is applied to it, and false twisting is performed while entwining the outer periphery of the fine denier single yarn in a helical shape. Moreover, since the fine denier single yarn is subjected to high tension, it does not fully develop crimping, and the resulting yarn appears as a core yarn structure due to the crimping forces of both. Furthermore, a difference in dyeing appears due to the difference in the actual stretching ratio between the two, and naturally the thick denier single yarn is dyed in a dark color. Next, the yarn that leaves the delivery roller after false twisting and untwisting is subjected to air entanglement treatment between it and the winding section, but in this case, as mentioned earlier, it is undesirable to increase the degree of entanglement. , as a result of various experiments, the air pressure is 2Kg/cm ² or less, preferably 1.5
We have found that it is better to keep the weight below Kg/cm ² . Of course, if the air pressure is too low, the effect will be lost, so it is necessary to have at least 0.5 kg/cm ² or more, although it also depends on the number of filaments and single yarn denier. Although various devices can be considered in this case, it is preferable to use a device using colliding flow as shown in US Pat. No. 3,115,691. By processing using the method described above, the first
As shown in the figure, most of the multifilaments 1 with a single fiber fineness of 1.5 denier or less form a core structure in a bundled state, and the multifilaments 2 with a single fiber fineness of 3 denier or more surround the core in a spiral shape. In addition, a processed yarn having entangled portions formed by air entangling treatment can be obtained. In addition, the polyamide-based synthetic multifilament in the present invention refers to a multifilament made of nylon 6, nylon 66, and a copolymer thereof, and the cross-sectional shape is not only circular but also polygonal such as triangular and pentagonal. This effect is also exhibited even with a hollow cross section. Example 1 Poly-ε-caproamide was melted at 265°C and spun from spindles with holes of 12, 16, 24, 34, 48, and 68, respectively, and the discharge rate was adjusted so that the resultant was approximately 68 denier after normal stretching. The yarn was then wound at 1300 m/min to obtain an undrawn yarn having the properties shown in Table 1.

[Table] The cutting elongation is a value measured using a Shimadzu DDS-500 autograph at a sample length of 10 cm and a tensile speed of 50 cm/min. These six types of undrawn yarns were combined and supplied to an FK-5CS drawing/false twisting machine manufactured by Barmarg Co., Ltd., and subjected to simultaneous drawing and false twisting, and the results shown in Table 2 were obtained. In addition,
Common conditions are heater temperature 180℃, number of false twists.
2500T/M and speed 200m/min were adopted.

[Table] Example 2 Poly-ε-caproamide was melted at 265°C, and the brands after normal stretching were 40d/48f, 50d/48f,
60d/48f, 80d/12f, 90d/12f, 100d/24f,
Adjust the discharge amount to 50d/12f, 60d/12f, 80d/72f, 90d/72f, wind at 1300m/min,
An undrawn yarn having the performance shown in Table 3 was obtained. Next, by combining this undrawn yarn, Example 1
Using the same machine as, heater temperature 180℃, number of false twists
Stretching and simultaneous false twisting were carried out under the common conditions of 2500T/M and a speed of 200m/min. The results are shown in Table 4. Note that the cutting elongation measurement and evaluation methods were similar to those in Example 1.

【table】

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the processed yarn of the present invention. 1: Multifilament with a single yarn fineness of 1.5 denier or less, 2: Multifilament with a single yarn fineness of 3 denier or more.

Claims (1)

[Scope of Claims] 1 A polyamide-based synthetic multifilament false-twisted yarn in which yarn F ₁ of the constituent filaments has a single filament fineness of 1.5 denier or less and yarn F ₂ of 3 denier or more coexist in the following weight ratio. Therefore, most of the filaments of F ₁ are in a focused state, and F ₂ has a structure surrounding F ₁ in a spiral shape, and the dyeing ability of F ₂ with respect to acid dyes is higher than that of F ₁ over the entire yarn length direction. A polyamide-based synthetic multifilament processed yarn, which is characterized by having an entanglement larger than the wear capacity and an entanglement degree of 10 strands/m or less. 40≦Weight of F ₁ / (Weight of F ₁ + Weight of F ₂ ) × 100≦60 (%) 2 Yarn with single filament fineness of 1.5 denier or less after drawing
Two types of undrawn polyamide-based synthetic multifilament yarns with yarns U ₁ and U ₂ of 3 deniers or more, whose difference in elongation at break satisfies the following formula, are calculated by the following formula in terms of weight ratio: When performing simultaneous stretching and false twisting to achieve a satisfactory level of alignment, the stretching ratio must be adjusted.
Adjust to 0.90 to 0.95 times the specific stretching ratio of U ₁ , and
A method for producing polyamide-based synthetic multifilament processed yarn, which is characterized by performing air entanglement treatment at an air pressure of 2 kg/cm ² or less immediately before winding. 30≦Cutting elongation of U ₂ - Cutting elongation of _{U 1} ≦100 (%) …… 40 ≦ Weight of U ₁ / (Weight of U ₁ + Weight of U ₂ ) × 100 ≦ 60 (%) ……