JPH02502201A - Method for manufacturing elastic bulky yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Method for manufacturing elastic bulky yarn The present invention is a method for producing elastic bulky yarn from elastomer multifilament yarn. The present invention also relates to a bulky yarn produced by this method.

Highly elastic fibers made from rubber and thermoplastics, so-called elas Tomer fibers are known. Elastane, which belongs to elastomer fibers, an, trade name) when the fiber consists of multifilaments glued together , has disadvantageous textile properties.

Special measures are required to process such elastomeric fibers. Before normal processing This type of elastomer is simply produced by subjecting the fiber to a twisting or heating process. It cannot be used on its own, and it produces blubber-like (spec-cki) g) This is because it exhibits a good appearance. Elastomeric systems are always nylon or polyester It is processed into composite yarns together with other chemical fibers such as DE-A-2412592), this process requires a large number of steps and is therefore costly. It costs a lot of money and is not economical.

Traditionally, attempts to texture with a driven spindle It was a failure because it stretched to its limit and the thread could not be pulled out through the heating bottle. . In addition, the friction unit (Friktionaggregate) Attempts have been made to apply texture processing to yarn, but conventionally textured yarn It was impossible to obtain.

It is an object of the present invention to provide non-bonded elastomeric multifilament yarn with textile properties. The object of the present invention is to provide a simple method for imparting high elasticity and elastic properties.

In the present invention, the elastomer multifilament yarn is textured. This achieves the above objectives.

In the present invention, the elastomeric multifilament yarn is textured. was successful for the first time. Textured elastomeric yarns have relatively high elongation The strength of the elastomer is almost unchanged, and its elongation curve is smooth. The slope is gentler and more regular than the elongation curve of yarn. Highly elastic bulky yarn produced The textile properties of this material have the advantage that they can be directly processed into planar textiles.

It is appropriate to heat the multifilament yarn at a speed of 200 m/min or more. , the twist is accumulated on the upstream side of the texturing unit and the twist is 0. 5-3. OcN/Tex, especially 1.0-2. 14 under OcN/Tex tension The twisted yarn heat-set at 0 to 190°C1, especially at 160 to 190'C, is put into a friction disc unit. It is also appropriate to texture the material by

Frictional texture processing is done by Positorqs (product name) Liquor) (Aggregat) is preferred, and the thread is The yarn is actively fed by the unit and therefore the yarn is relatively small downstream of this unit. It passes under a high tension.

The resulting multifilament bulky yarn has high elasticity and unbonded uniform fibers. Excellent in terms of flexibility.

Polyethers, especially block copolymers, are particularly useful as starting materials for texturing. ester, polyester ester.

Polyether ester amides and polyether amides have been found to be suitable. It was. As a soft segment, polyalkylene oxide or dicarboxylic acid or aliphatic polyester produced from its alkyl ester and diol , dimer acid esters, etc., as well as polycaprolactone are suitable, and hard segment The ment can be further modified with comonomers such as isophthalic acid. Polymers such as polyethylene terephthalate and polybutylene terephthalate Alkylene terephthalate or polyamide is suitable for the bulky yarn of the present invention. The melting point is 200°C or higher. These polymers are melt-spun using the spin-draw method. By this process, smooth threads are generated. This smooth yarn is significantly larger than known elastane yarns. Initial modulus point of 80 to 150 cN/tex and length of unstretched yarn It has an excellent residual elongation of preferably 10 to 15% and a maximum of 25%.

The bulky yarn obtained by the method of the present invention has a crimp degree of more than 40% and a degree of crimp of more than 50%. Excellent crimp stability.

The invention will now be explained by way of example with reference to the drawings.

FIG. 1 is a flow sheet of an example of the method of the present invention, and FIG. 2 is a flow sheet of a method of the present invention. Graph showing the relationship between stress and elongation in ether ester elastomer yarn, Figure 3 shows stress in polyetherester elastomer yarn produced from polymer B. It is a graph showing the relationship between and elongation.

In FIG. 1, the supply bobbin is indicated by the reference numeral 1, and the multifilament yarn 2 has a length of 200 m. is guided through a yarn guide 3 and a yarn brake 4 at a running speed of /min. It is heated by the friction heating unit 8 between the delivery mechanism 5 and the second delivery mechanism 9. Ru. A contact heater 6 is provided downstream of the first delivery mechanism 5 . Both delivery mechanisms 5.6 operate at the same speed. Twisting that is accumulated on the upstream side of the unit The yarn 7 is fixed in a contact heater 6 heated to 180°C and then in a friction heating unit It passes through an array of 8 friction discs. The active delivery from the friction unit 8 is the friction This enables machining with relatively high tension on the upstream side of the heating unit 8, and reduces the friction unit. This enables processing with relatively low tension on the downstream side of the knit 8. This text The charred twisted yarn 7 is transferred to the cylinder of the winding wheel 10 on the downstream side of the second delivery mechanism 9. It is rolled up on top.

Figure 2 shows a smooth elastic yarn 2 made from polymer A and a textured elastic yarn. Figure 3 shows the stress-elongation curve of yarn 7, and Figure 3 shows the stress-elongation curve of yarn 7 manufactured from polymer B. Show a curve.

All texturing experiments produce high modulus polyamide textured yarn Conducted on a 5CRAGG C512 test machine equipped with a friction unit to did. This friction unit had a 115/1 sheet configuration. It has the effect of guiding the thread. The outer disks are chrome plated and the five middle disks are made from polyurethane.

The table below shows the results of experiments using two different elastomers: block and polybutylene. Polymer B is a polyethylene terephthalate block. It consists of block and polyethylene glycol block.

Experimental conditions: 5CRAGG C312-600 Machining speed: 200m/min True twist rate: 0% D/Y ratio: 1', 45: 1 Temperature: 180’C Friction disc: 115/1 polyurethane Experimental result: The initial modulus was calculated based on the stress-elongation diagram (see Figures 2 and 3).

Initial modulus (cN/tex) = Calculate the elongation at break (= elongation %) from the curved elongation diagram and calculate the strength per count. Ta.

Crimp degree and I4! Shrinkage stability according to DIN 53840 texture matte (Texturmat, trade name).

The residual elongation was determined from the elongation hysteresis. 5 times without interrupting the sample. It was stretched to 80% of its elongation at break: then unloaded. Then, the stress is removed. After waiting for 2 minutes in this state, new growth occurred. Residual elongation is the elongation when stress acceptance begins. It was called degree.

The resulting textured yarn has excellent elastic properties: especially for stockings and sports Suitable for elastic fabrics for clothing and outerwear. However, the method produced by the method of the present invention The yarn can be used to produce all kinds of stockinette products and knitted fabrics.

The yarn produced by the method of the present invention can be used for vinyl elastic mesh for sportswear. Used as plated yarn to make products. another bulletin Polyamide, polyester, cotton or viscose can be used as the ground thread. The elastic bulky yarn produced by the method of the present invention has a relatively low melting point. Since it is low, it can be used advantageously during brating.

Prefectural Uni-go 1... Supply bobbin 2...Elastic multifilament 3... Yarn guide 4...Yarn brake 5...first delivery mechanism 6...Contact heater 7...Textured elastomer yarn, twisted yarn 8...Frictional heating unit to 9...Second delivery device 10... Take-up reel (elastic bulky yarn) ft:hiN) &　h　(N) international search report international search report

Claims (8)

[Claims] 1. In manufacturing elastic bulky yarn from elastomer multifilament yarn, Texturing the elastomer multifilament yarn (2) A method for producing elastic bulky yarn. 2. Twisting the elastomer multifilament yarn at a speed of 200 m/min or more , this twist is accumulated and under a tension of 0.5-3.0 cN/tex 140~ The twisted yarn (7) heat-set at 190°C is textured by the friction disc unit (8). 2. The method according to claim 1, wherein the method comprises: 3. A bulky yarn produced by the method according to claim 1 or 2, The bulky yarn is characterized in that it is composed of uniform fibrils that are not bonded. Bulky thread. 4. The residual elongation of the elastomer multifilament yarn is 25% of the length of the unstretched yarn. % or less. 5. The bulky yarn according to claim 3, wherein the melting point of the elastomer is 200°C or higher. 6. Claim 3, wherein the degree of crimp is greater than 40% and the crimp stability is greater than 50%. Bulky yarn. 7. The elastomeric multifilament yarn is a melt-spun polyester ester. polyester, polyether ester, polyether ester amide or polyether Claim consisting of an amide and having an initial modulus of 80 to 150 cN/tex. The method described in 1. 8. Can be used alone or mixed with yarns of other synthetic or natural materials to produce sheet textile products. Use of the thread according to any one of claims 1 to 7 for use in manufacturing.