JPS61146829A - Production of hemp like composite processed 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] <Industrial Application Field> The present invention provides a method for producing composite processed yarn that can produce a woven or knitted fabric that has a refreshing linen-like texture and excellent one-dimensional stability. It is related to.

<Prior art> Conventionally, in the false twisting process, a false twisting body such as a false twisting spindle or a temporary false twisting nozzle is operated intermittently to perform an unsteady false twisting heating operation, thereby creating an unsteady shape in the longitudinal direction of the yarn. Forming the untwisted converging portion and the over-twisted converging portion alternately is disclosed in, for example, Japanese Patent Publication No. 39-12891, Japanese Patent Publication No. 40-14615, Japanese Patent Application Laid-Open No. 51-49949, and Japanese Patent Application Laid-open No. 53-61745. It is well known as seen in .

<Problems to be Solved by the Invention> However, when using a drawn yarn of thermoplastic synthetic fiber multifilament as the supply system in these methods,
Because the fiber structure of the drawn yarn is stable and the Young's modulus is large, the stability of actual twisting is poor, and the untwisted part and the overly untwisted part have opposite twist directions due to twist propagation. As a result of the fact that the actual twists tend to cancel each other out, there is a disadvantage that the remaining twist density in the ununraveled bundled part and the over-untwisted part of the resulting processed yarn is low.

On the other hand, when a highly oriented undrawn yarn of thermoplastic synthetic fiber multifilament is used as a supply system, the twist is fixed by the heat treatment of unsteady false twisting because the highly oriented undrawn yarn has low crystallinity and orientation. On the other hand, it is easy to obtain a processed yarn having an ununraveled bundled part and an overtwisted part where a high degree of twist density remains.
Because the fiber structure of highly oriented undrawn yarn is unstable, not only is yarn breakage likely to occur during unsteady false twisting, but also the residual elongation of the resulting processed yarn is large, so it is difficult to As a result of tension and ironing, the twists in the untwisted part and the overtwisted part are offset or stretched, resulting in the disadvantage that the high twist density of the processed yarn itself cannot be realized in the fabric. The problem remained.

The present invention solves the above-mentioned drawbacks of the conventional technology, and alternately has an ununraveled converging section and an over-untwisted condensed section, which have a high twist density and have high stability of the remaining actual twist. The technical problem is to produce a composite processed yarn that can be used to obtain a woven or knitted fabric product that has a natural hemp-like texture and excellent 9-dimensional stability.

<Means for solving the problems> That is, 1 the present invention combines a polyester drawn yarn with a polyester highly oriented undrawn yarn having a residual elongation less (both 10% higher) than the drawn yarn, and The method is characterized in that a false twist heating operation is performed intermittently at a temperature at which the oriented undrawn yarn melts.

The present invention will be further explained in detail below.

First, in the method of the present invention, a drawn polyester yarn and a highly oriented undrawn polyester yarn having a residual elongation higher by at least 10% than the drawn yarn are combined.

Here, the drawn polyester yarn is manufactured by a known method such as a method of spinning and hot drawing a polyester filament yarn with a high degree of orientation and high crystallinity. Further, the highly oriented undrawn polyester yarn is an undrawn yarn spun at high speed and has a residual elongation that is 10% or more higher than the residual elongation of the drawn yarn. In this case, the larger the difference in residual elongation between the nine yarns, the more effective it is to create a winding form with a core-sheath structure. However, if the difference in residual elongation is too large, the difference in yarn length between the core and sheath becomes large. If the sheath part becomes too loose, the highly oriented undrawn yarn in the sheath part will wrap around the core part in an extremely loose state, which may deteriorate the shape stability and adversely affect the weaving and weaving process and product properties, which is undesirable.

Therefore, the residual elongation of the highly oriented undrawn polyester yarn is approximately 10 to 150% higher than that of the drawn polyester yarn.
It is preferable to make it large. The above-mentioned two types of polyester filament yarns are combined together, and in this case, nine-folding includes cases in which the two types of polyester filament yarns are aligned or twisted together.

Next, the above-mentioned two types of polyester filament yarns are intermittently subjected to a false twist heating operation at a temperature at which the highly oriented undrawn yarns are melted. Here, performing the false-twisting heating operation intermittently refers to heating intermittently in the S direction or Z direction with a false-twisting body, or heating intermittently in the S direction and the Z direction alternately. say. In addition, when heating alternately in the S direction and the Z direction, the case where heating is performed alternately and continuously is also included.

In the method of the present invention, the false-twisting heating operation is performed intermittently in this manner. For example, compressed gas is intermittently supplied to the twisting nozzle, and the twisting and stopping operations are repeated.

To explain the case where alternating s and Z twists are applied to the plied yarn using the transient phenomenon of false twisting, when compressed fluid is supplied to the twisting nozzle, the plied yarn will not be twisted. Twisting is performed in the heating direction in the heating area before the nozzle. On this occasion,
A drawn yarn with a small residual elongation has a high tension and forms a core yarn with a twist in the heating direction, while a highly oriented undrawn yarn with a large residual elongation is heated while being wound around the core yarn. Set. In this case, the heat setting temperature is the temperature at which the highly oriented undrawn yarn is melted, so the filaments of the highly oriented undrawn yarn wound around the core yarn are melted and bonded9. It has higher morphological stability.

Then, when the supply of compressed fluid to the twisting nozzle is stopped,
The actual twist in the heating direction that has been set by twisting heat in the heating area forms an ununtwisted condensed portion without being subjected to an untwisting action in the untwisting area after passing through the twisting nozzle. On the other hand, at the same time
In zone 8, the highly oriented undrawn yarn is not subjected to the twisting action and passes through the twisting nozzle in a melted state due to heating, and then the compressed fluid is supplied again to untwist the yarn in the heating direction in the untwisting zone. An untwisting action is applied to the remaining part to form an over-untwisted part having a smaller number of twists in the untwisting direction than the untwisted part. In this case as well, the highly oriented undrawn yarn has a higher residual elongation than the drawn yarn, so the drawn yarn is used as a core yarn and the highly oriented undrawn yarn is wound around it. However, the state of melting of highly oriented undrawn yarn is different when it is untwisted in the untwisting region and when it is heated in the heating region mentioned above, and when it is heat set while being subjected to heating action, The highly oriented undrawn yarns are fused and bonded in a wound state, naturally resulting in a strong untwisted bundle form. On the other hand, in the over-untwisted collecting part, the heated and melted highly oriented undrawn yarn passes through the twisting nozzle and is then twisted by an untwisting action. It also becomes a weakly twisted state.

In this way, a hemp-like composite processed yarn exhibits a core-sheath structure in which the yarn is wound alternately in the S and Z directions in the longitudinal direction, and the degree of melting and adhesion varies alternately in the longitudinal direction due to the heating action of the heating region. can get.

In this way, the two methods of the present invention can produce two types of yarn: drawn yarn and highly oriented undrawn yarn.
This is a process in which polyester filament yarns are interwoven and subjected to unsteady false twisting, and in the false twisting region, the drawn yarn with low elongation becomes highly tensile to form a core yarn.

A processed yarn is obtained in which the highly oriented undrawn yarn with low tension becomes a wound yarn with a core-sheath structure, and has alternately ununtwisted and over-twisted areas in the longitudinal direction. Since the core yarn in the bundled portion is a drawn yarn with a stable fiber structure and high strength, it has extremely stable false twisting processability. On the other hand, the tension applied to highly oriented undrawn yarn, which becomes the wound yarn, is extremely low due to its high elongation, and even if the fiber structure is unstable and its strength is low, problems such as yarn breakage and fluffing occur during processing. Stable operability can be maintained without any problems.

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention.
A) and the highly oriented undrawn polyester yarn (F8) are supplied to the supply roller (1) and are combined.

It is sent to the false twisting processing area via the supply roller (1), and is heated intermittently by the twisting nozzle (3) while being heated by the first heater (
2), the polyester highly oriented undrawn yarn is heat-set at a temperature where it melts, and is sent to the reheat treatment area via the first delivery roller (4), where it is heated between the first delivery roller (4) and the second delivery roller (4).
A relaxing heat treatment is performed between the puff and the delivery roller (6) by a second heater (5), and the puff is rolled up into a puff cage (8) by a winding roller (7) after passing through the second delivery roller (6).

The polyester in the method of the present invention is a general term for polyesters containing ester bonds in the molecular chain, typified by polyethylene terephthalate, and also includes modified polyesters containing a third component such as isophthalic acid and paraoxybenzoic acid.

Further, in the method of the present invention, the twisted body to which the false twist heating operation is performed is a twisting nozzle using compressed fluid.

Examples include a belt-driven spindle-type twisting body, a friction-type twisting body, and an air spindle-type twisting body.

<Example> The method of the present invention will be specifically explained below with reference to Examples.

Example Using the polyester drawn yarn and the highly oriented undrawn polyester yarn shown in Table 1 as the supply system, and following the process shown in FIG. Processed yarn was manufactured.

On the other hand, for comparison, two types of drawn yarns with an elongation difference of less than 10% as shown in Table 1 were used as a supply system, and unsteady false twisting was performed in the same manner as above to produce comparative composite textured yarns. .

Table 1 (Note) () indicates residual elongation.

Table 2 A load of 2/d was applied to these composite processed yarns.

When the number of remaining twists in the straight state was measured, the results shown in Table 3 were obtained.

Table 3 As is clear from Table 3, in the case of the present invention in which the elongation difference in the supply system is large, the number of remaining twists in the image focusing part is high, and the number of remaining twists in the untwisted collecting part and the over-twisted part is high. It has a large number ratio of 2 or more, has a large change in shape in the longitudinal direction of the yarn, and effectively realizes a hemp-like texture. On the other hand, in the case of comparison, the number of remaining twists in the image convergence part is low, and the ratio of the number of residual twists in the unresolved convergence part and the over-twisted part is small, less than 2, and the shape of the yarn in the longitudinal direction is small. The change is small, indicating that linen-like texture is difficult to achieve.

<Effects of the Invention> As described above, in the method of the present invention, a polyester drawn yarn and a highly oriented undrawn polyester yarn having a residual elongation higher than the polyester yarn by 10% or more are combined as a supply system, and the highly oriented undrawn yarn is Since the false-twisting heating operation is performed intermittently at a melting temperature, the method of the present invention provides a composite textured yarn that has extremely strong morphological stability and exhibits a hemp-like texture and appearance. I can do it. In other words, in the present invention, as mentioned above (because the wound yarn is a highly oriented undrawn yarn with strong heat fixability, the shape robustness of the bundled part is very high, and the S and Z directions alternately arranged in the longitudinal direction) The actual twists of the two are not canceled out.

In addition, since the core yarn is a drawn yarn with high elongation stability, it will not lose its twisted form or become fully elongated even when subjected to tension and ironing during the weaving and weaving process. Furthermore, in terms of twist density, the ununtwisted bundle is a bundle formed in a heating area of the heating element, so the degree of melting and adhesion of the wound yarn made of highly oriented undrawn yarn is strong, and this combined with the high twist density It becomes even tighter and can impart a two-strong twist texture to the woven or knitted fabric. On the other hand, as described above, the over-twisted part is formed in the untwisted area without a heating element, so the degree of fusion adhesion is weaker than that of the untwisted part.

In addition, since the twist density is low, this over-untwisted part gives the woven or knitted fabric a fluffy feel and a soft linen-like crisp feel.

In addition, the difference in twist density between the untwisted part and the overtwisted eastern part causes apparent thickness unevenness due to the difference in the melting state.
Gives a natural spun yarn look to woven and knitted products.

In addition, since the method of the present invention has the above configuration,
High twist density of the core-sheath structure can be achieved by simply doubling the yarns and applying an unsteady false twisting process, without performing complicated operations such as feeding two types of yarn to the false twisting area at different feeding speeds. It is possible to form an untwisted convergent part and an overtwisted convergent eastern part. Since the drawn yarn with a stable fiber structure and high strength serves as the core yarn in any of the bundled portions, extremely stable textured yarn can be changed.

In addition, the tension applied to the highly oriented undrawn yarn that becomes the wound yarn is extremely low due to its high elongation, and even if the fiber structure is undefined and the strength is low, problems such as yarn breakage and fluffing occur during processing. Stable operability can be obtained without causing problems.

[Brief explanation of drawings]

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention. (1)... Supply roller, (2)... First heater, (
3)... Twisting nozzle, (4)... First delivery roller, (5)... Second heater.

Claims (1)

[Scope of Claims] 1. A drawn polyester yarn and at least 1 more than the drawn yarn.
A linen-like composite textured yarn characterized in that it is spliced with a highly oriented undrawn polyester yarn having a residual elongation as high as 0% and subjected to intermittent false twist heating at a temperature at which the highly oriented undrawn yarn melts. manufacturing method. 2. The method for producing a linen-like composite textured yarn according to claim 1, wherein the intermittent false-twisting heating operations are performed in the same direction. 3. The method for producing a linen-like composite textured yarn according to claim 1, wherein the intermittent false-twisting heating operation is performed in different directions.