JPH081015B2 - Composite crimped yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a composite crimped yarn composed of a plurality of crimped yarns having different physical properties, more specifically, excellent in tensile strength and crimp fastness, In particular, the present invention relates to a novel composite crimped yarn which has excellent properties when used in non-clothing fields such as hoses and sheets which require strength, stretchability and bulkiness.

[Prior Art] In order to improve the crimp characteristics of crimped yarn, for example, the number of twists may be increased in false twisting, the heater temperature may be increased, or the crimp length may be shortened in indenting. It was necessary to take conditions such as raising the temperature, raising the rubbing tension in rubbing, and raising the set temperature, but under all of these conditions the strength decreased.

On the other hand, in order to obtain a crimped yarn with a high strength, the number of twists in the false twisting process is lowered, the heater temperature is lowered,
It is necessary to take conditions such as increasing the crimp length in indenting, lowering the set temperature, lowering winding tension in rubbing, lowering the set temperature, etc.
All of these conditions were in the opposite direction to the conditions for increasing the crimp property, and the crimped yarn obtained had low crimp property.

In addition, various attempts have been made to obtain crimped yarns having high crimping characteristics and crimped yarns having high strength by changing the physical properties of the raw material yarn. For example, in order to obtain a false twisted yarn having a high crimping property, a highly oriented undrawn yarn having a good heat-setting property and a raw yarn having a small thermal history and a large breaking elongation are preferable, but these are all obtained. The strength of the crimped yarn obtained was low. On the other hand, in order to obtain a crimped yarn having a high strength, the crystallinity of the feed yarn should be high and the draw ratio should be large. However, when such a feed yarn is crimped, the set of crimps is set. It is difficult to obtain a crimped yarn, and only crimped yarn having a low crimping property is obtained.

As described above, generally, the strength of the crimped yarn and the crimp characteristic have an inverse correlation, and an example of the relationship is shown in FIG.

Fig. 1 shows that among the crimping methods, the false twisting method, which has excellent strength and crimp fastness
This is a 100 denier 36 filament raw yarn obtained by variously changing the false twisting conditions.

Here, (A) is a polymer generally used for clothing, which is spun from a polymer having an intrinsic viscosity of 0.70, and (B) is a polymer having a high degree of polymerization to obtain a yarn with high strength. It was spun from a polymer with an intrinsic viscosity of 0.85.

The shaded portion shown in (C) is the range of the yarn physical properties of the 100-denier composite crimped yarn of the present invention.

As described above, with the crimped yarns known so far, the composite crimped yarn of the present invention could not be obtained even if the physical properties of the raw yarn supplied and the processing conditions were changed.

(Problems to be Solved by the Invention) The present invention provides a novel composite crimped yarn excellent in tensile strength and crimp fastness which cannot be obtained by the conventionally known crimped yarn. The purpose is to

(Means for Solving Problems) The present invention has the following configuration in order to achieve such an object. That is, the present invention is a composite crimped yarn composed of a plurality of crimped yarns having different physical properties, having a tensile strength of 5.
The crimped yarn having a denier ratio of 5 g / denier or more is at least 1/4 or more, and the crimped yarn having a crimp fastness of 1.1 times or more the crimp fastness of the composite crimped yarn is at least a denier ratio. 1/4 or more, respectively, contained in the composite crimped yarn, the tensile strength of the composite crimped yarn is 5 g / denier or more, the crimp fastness of the composite crimped yarn is as follows (1 ) Or (2)
It is a composite crimped yarn characterized by satisfying an expression.

Next, the present invention will be described in more detail. The composite crimped yarn of the present invention is composed of at least two crimped yarns having different physical properties. This is to increase the tensile strength and crimp fastness of the composite crimped yarn as described later. When a composite crimped yarn is produced from a plurality of crimped yarns, the tensile strength and the crimp fastness are about 0.7 to 1.0 times the values calculated by the denier ratio of the constituent crimped yarns.

Therefore, in order to set the tensile strength and crimp fastness of the composite crimped yarn to the above-mentioned targets, the tensile strength of the crimped yarn is 5.
5 g / denier or more, preferably 6 g / denier or more, the crimp fastness of the crimped yarn is at least 1.1 times or more, preferably 1.15 times or more that of the composite crimped yarn depending on the denier, and below this. This is because the strength and crimp fastness of the obtained composite crimped yarn cannot be secured.

The relationship between the denier and crimp fastness of the composite crimped yarn is shown in FIG. 2 (D), and the case of a normal polyester false twisted yarn is shown in (E). Here, the tensile strength of the composite crimped yarn is
Although it is a value at 5 g / denier, it is not possible to secure a tensile strength of 5 g / denier with ordinary polyester false twisted yarn, so the value at 4 g / denier is shown.

Thus, it can be seen that the composite crimped yarn of the present invention still has a large difference in crimp fastness when the tensile strength is larger by 1 g / denier than the conventional false twist crimped yarn. Thus, the composite crimped yarn of the present invention has a tensile strength
5g / denier or more, crimp fastness is 2nd depending on denier
It is more than the line in Fig. (D), so even if it is used for sportswear, hoses that require elasticity for the first time, and the field of seats, it will not be possible to obtain elasticity and durability that were previously obtained with crimped yarn. You can get sex.

Further, since the crimping property is large, it is possible to manufacture a bulky cloth, and by utilizing its tensile strength, it can be applied to various clothing and non-clothing applications.

The crimped yarn having the highest tensile strength and crimp fastness described above is preferably contained in the composite crimped yarn at least 1/4 in denier ratio. This is at least 1/4 in the denier composition ratio, and due to the difference in physical properties, only the crimped yarn is emphasized and it rises.
This is because the resulting crimped yarn tends to have an irregular shape and the surface of the fabric tends to be damaged, which is not preferable.
As described above, the tensile strength of the composite crimped yarn is a coefficient (K = 0.7 to 1.) calculated based on the denier ratio of each of the constituent crimped yarns.
It is multiplied by 0), but in order to increase K, it is better to combine those having similar elongation behavior.

Furthermore, it is preferable that the crimped yarn having a high tensile strength has an intrinsic viscosity of 0.75 or more (measured at a mixed solution of phenol: tetrachloroethane = 6: 4 at 30 ° C.) since it is easy to secure the strength of the crimped yarn. .

Here, the tensile strength is 20 cm with a constant-speed extension type tester according to JIS L-1090 5-5, and the pulling speed is 100% /
The crimp fastness is 8 after adjusting the tension to 0.1 g / denier using a rattle with a circumference of 1 m.
After making a roll skein and dipping it in a suitable hook for 5 minutes under a load of 5 mg / g of denier and immersing it in hot water at 97 ° C for 15 minutes, remove this sample from the hot water and leave it in a wet state. The load (g) of 0.2 g / denier is applied and the length (a) after 1 minute is measured. Then remove the load, leave it on the hook with no load, and leave it in the dryer at 60 ° C ± 2 ° C for 30
Min-dry, leave in an atmosphere of 20 ° C ± 2 ° C, RH 65% ± 2% for 1 hour or more, then apply a load of 2 mg / g of denier,
The length (b) after 1 minute was measured and calculated by the following formula.

The composite crimped yarn of the present invention preferably has a denier of 80 or more. Below this, although the tensile strength is large as apparent from FIG. 2, since there is almost no difference in crimp fastness, the composite crimped yarn of the present invention has a large tensile strength and is crimped. It is difficult to take advantage of the high robustness.

Furthermore, the composite crimped yarn of the present invention is preferably twisted and / or entangled. When the denier of the composite crimped yarn is D, the number of twists is However, the number of entanglements when entangled is preferably 5 to 100 / m. Outside of this range, for example, when it is low, it is easy to separate into constituent yarns, and troubles such as catching yarns in the rewinding, fabric preparation process, and fabric production process, pulling, yarn breakage, machine stand stop, etc. are likely to occur. On the contrary, if it is high, the bulkiness is impaired by the influence of twisting or entanglement, which is not preferable.

The number of entanglements was measured by the following method. Fix the upper end of the thread with a clip, attach a needle at a right angle to the thread with 0.1 g / denier weight on the lower end, and gently move the needle upward and move it up until the weight is lifted a (c
m) was measured 50 times at different locations for one yarn, the average value (cm) was calculated, and the number of entanglements (ke / M) was calculated from 100 /. The composite crimped yarn of the present invention is preferably false twisted yarn. This is because, among the various crimping methods, the false twisted textured yarn has the most easy control of physical properties, and a certain quality is obtained, and the tensile strength and the crimp fastness are the highest. .

Further, as the material of the composite crimped yarn of the present invention, any thermoplastic fiber which can be crimped can be used, but a crimped yarn having high tensile strength and high crimp fastness can be used. Polyamide fibers such as nylon 6, nylon 66 and nylon 46, polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, or combinations thereof are preferably used for obtaining polyester fibers, with polyester fibers being particularly preferred. Of course, for the purpose of different dyeing, different color, and gloss effect, various modifiers and additives are copolymerized and kneaded,
It may be a mixture.

Further, it is also a preferable direction to make the cross-sectional shape different for the purpose of increasing the contact surface area with the resin or the adhesive and improving the gloss.

In addition, a high-speed spun undrawn yarn (POY) is also suitably used as a feed yarn used for a crimped yarn having a high crimp fastness in order to increase the crimp fastness.

Next, an example of the method for producing the composite crimped yarn of the present invention will be described. First, the crimped yarn having a high crimp fastness which is 1/4 or more in the denier ratio of the composite crimped yarn is preferably a polyamide fiber such as nylon 6 or nylon 66, polybutylene terephthalate fiber or polyethylene terephthalate fiber. The high-speed spun undrawn yarn is set to have a crimp fastness of (D) × 1.1 or more in FIG. At this time, in order to increase the strength, it is more preferable to use, for example, a polyester having an intrinsic viscosity of 0.7 to 0.8 and a polymer having a slightly higher degree of polymerization.

Next, the crimped yarn having a large tensile strength which denier ratio is 1/4 or more in the composite crimped yarn of the present invention, for example, polyester has an intrinsic viscosity spun from a polymer having a viscosity of about 0.7 to 1.0, and has a slightly stretch ratio. By setting a higher value, a drawn yarn of 7 g / denier or more is produced, and by false twisting it, a crimped yarn of 5.5 g / denier or more, preferably 6 g / denier or more is obtained.

Then, crimped yarns satisfying at least the above physical properties are combined so as to each include at least 1/4 in a denier ratio, and preferably 80 denier or more by using an ordinary yarn twisting machine or twisting machine. (D is a denier of a composite crimped yarn) or a fluid entanglement device, for example, a device described in Japanese Patent Publication No. 36-12230, which is commonly known as an interlacer, is used to obtain an entanglement degree of 5 to 100. The speed, fluid pressure, and tension may be adjusted so that it becomes K / M.

Both twisted yarn and entangled yarns may be used, but in that case the passability of the post-process will be better than that of the yarn treated alone, so do not give excessive focusing so that bulkiness is not impaired. So be careful.

(Examples) Examples 1 to 5 and Comparative Examples 1 to 2 supply raw yarn, false twisting process condition, yarn quality of crimped yarn at that time, yarn quality of composite crimped yarn, knitted fabric evaluation and comprehensive judgment Is shown in Table 1.

The false twisting machine used here was an ST-6 false twisting machine manufactured by Mitsubishi Heavy Industries, Ltd., and the knitted fabric was a 280N, 31/2 ″ tube knitting machine, and the tube fabric was treated at 100 ° C for 15 minutes. It is then dehydrated and dried in a dryer at 60 ° C ± 2 ° C for 30 minutes, then at 20 ° C ± 2 ° C, RH65% ± 2%
The stretchability and bulkiness of the knitted fabric left in the atmosphere of 1 hour or more were judged by 5 experts, and evaluated as excellent by ⊚, good by ○, bad by Δ, and bad by X.

Furthermore, when one of the constituent yarns is squeezed in the yarn feeding hole during knitting and a nep-like defect is knitted, knitting property is evaluated as Δ, thread cutting is not evaluated, and those without problems are evaluated as ○. Then, these were put together and a comprehensive evaluation was given.

Examples 1, 2 and 3 are representative examples of the present invention, and the composite crimped yarn also had good tensile strength, crimp fastness, stretchability of knitted fabric, bulkiness and knitting property. .

Example 4 is an example in the case of fine denier, and the normal 50
Elasticity compared to false twisted yarn of denier 24 filament,
It was excellent in bulkiness. Furthermore, since the number of twists was small, the yarn was twisted, and there was a problem in knitting.

Example 5 is an example of a thick denier of 300 denier, which is far superior in stretchability and bulkiness as compared with the processed yarn of polyester 300 denier 60 filament.

In Comparative Example 1, although the crimp fastness, stretchability, and bulkiness were inferior to those of Examples 1 to 3, the tensile strength was almost the same, but the tensile strength was similar to that of a normal false twisted yarn.

Comparative Example 2 is an example of an ordinary polyester false twisted yarn (single yarn), which has low strength and crimping properties, and accordingly, the stretchability and bulkiness of the knitted fabric are poor.

(Effects of the Invention) As described above, the composite crimped yarn of the present invention is excellent in tensile strength and crimp fastness, and is therefore excellent in stretchability and bulkiness of the fabric, and in addition, a preparatory step for making the fabric, a fabric making process. Even in the process, there is no problem, and when used in sportswear and hoses that require strength, elasticity, and bulkiness, it has the outstanding effect of exhibiting excellent characteristics.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the strength of crimped polyester twisted yarn and crimp fastness, and FIG. 2 is a graph showing the relationship between denier and crimp fastness of crimped yarn.

Claims (1)

[Claims] 1. A composite crimped yarn comprising a plurality of crimped yarns having different physical properties, wherein the crimped yarn having a tensile strength of 5.5 g / denier or more has a denier ratio of at least 1/4 or more, The crimped yarn having a crimp fastness of 1.1 times or more of the crimp fastness of the composite crimped yarn has a denier ratio of at least 1/4 or more,
Each of them is contained in the composite crimped yarn, the tensile strength of the composite crimped yarn is 5 g / denier or more, and the crimp fastness of the composite crimped yarn is represented by the following formula (1) or (2). ) A compound crimped yarn characterized by satisfying the formula.