JPS61207634A - Rubbery yarn covered with coil and having limited elasticityand method and apparatus for producing the same - 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] The present invention provides a method for achieving controlled and limited elasticity by inserting one or more inelastic, semi-rigid or crimped yarns parallel to the elastic yarn. The present invention relates to an elastomer-like elastic yarn coated with one or more coils, and also to a method and apparatus for producing this elastic yarn with controlled and limited elasticity. In this specification, rubbery threads refer to natural,
Refers to all elastic threads of artificial or synthetic origin. On the other hand, inelastic, semi-rigid or crimped yarn means a yarn that has a degree of elongation that is extremely limited compared to the elastic yarn.

Margin below [Prior Art] It is known to cover rubbery threads with one or more layers of coils of inelastic threads in order to strengthen them and protect them from external forces.
One coil is wound to the right on the rubbery yarn to balance the yarn, the other coil to the left, while the coils are wound tightly to provide some extensibility.

However, when the coated elastic yarn is stretched close to its breaking elongation, the wrapped yarn forms multiple coil loops around the rubbery yarn. As a result, as the thread is stretched and put under tension, the loops are squeezed on the rubbery thread, the tightening acting as a force for breaking. Therefore, the extensibility of the coil-covered elastic yarn cannot be controlled by this method.

When such elastic threads are used as elastic ties for tying sausages or general packaging articles, accurate and uniform tying cannot be obtained. For this reason, this elastic lace has not yet been widely used in applications requiring these properties.

[Means for solving problems]

The present invention involves the insertion of one or more inelastic, semi-rigid or crimped threads parallel to the elongated rubbery thread during the process of covering the elastic thread with a coil of non-elastic thread; These drawbacks are eliminated by allowing the yarn to stretch, in use, after the yarn is relaxed, by an amount determined by the length of the inelastic or crimped yarn, and to avoid widespread confusion. This solves the problems that had been encountered.

A device for carrying out the controlled merging of an elastic system with a non-elastic or crimped thread may be used, during the coil winding process, one or more non-elastic, semi-rigid or crimped threads parallel to the elastic thread. p/! It consists of an improved coiling device with the addition of means for inserting the curled yarn and means for imparting a predetermined elongation to the elastic yarn during the coil winding operation.

According to the present invention, in order to solve the above problems,
A length of elongated inelastic, semi-rigid or crimped thread is combined in parallel with one or more tensioned rubbery threads.

Crimp gives the inelastic yarn special properties, namely a certain elongation and recovery, also referred to as extensibility or elasticity.

This inelastic, semi-rigid or crimped yarn can be used at several points: (a) before coiling, i.e. before all coils have been covered; (b) at the first coiling. (C) after the operation, more particularly the last winding before the operation, or (C) each winding is placed parallel to the elongated rubbery thread.

If the inelastic, semi-rigid or crimped thread is inserted at the point in point (b) above, i.e. before the last winding, the inelastic, semi-rigid or crimped thread may be wrapped only by the thread. Since it is captured, there is room for it to curve or curl, and the above (
The noticeable effect is that many loops occur that are longer than those obtained by working at point a). This greater freedom for bending and curling results in less friction and less braking force during the return of the elastic thread compared to the insertion at point (a). Loose loops can provide thread tension with less time and energy.

Inelastic or crimped yarns may be composed of several filaments of different materials and colors. This facilitates the differentiation of product lots or even provides decoration for the final product.

According to the present invention, the tension of the elastic thread can be regulated,
This allows uniformity of the final product to be obtained. That is, when using a loom, the loom operates under the tension of inelastic yarns, so even though we are using elastic yarns that have a wide range of recovery and extensibility, it seems as if there are no elastic yarns. can be handled.

Therefore, the present invention provides the Raschel m4f! , a shuttle loom, a circular knitting machine, and other fabric-making machines without difficulty.

Furthermore, the threads produced according to the invention can be made so that the aforementioned clamping is not only ineffective, but also prevents the yielding of the rubbery threads, which would result in permanent deformation.

This yarn with different properties, made of different materials, one elastic and the other inelastic, has the advantage of combining the properties of each yarn, is versatile and suitable for garments. used. Due to the controlled elasticity of this yarn, this flexible elastic yarn is suitable for a wide range of applications.

The features of the present invention will be explained in more detail with reference to the drawing of the apparatus shown in FIG.

A coiling device as shown in FIG. 9 is used to coat elastic yarns with inelastic yarns such as natural fibers or synthetic fibers. This apparatus has the necessary modifications to carry out the process for producing elastic yarns with controlled and limited elasticity.

Coiling devices usually consist of a number of units, each unit consisting of two stacked coil forming means. One means forms a coil in one direction of rotation around the elastic thread, and the other means forms a coil in the opposite direction of rotation.

More specifically, each means is supported by a fixed frame l, on which a hollow shaft 2 is fixed, preferably screwed, on which a rotary holder 3 is installed by means of a ball bearing, and a suitable motor is mounted on the hollow shaft 2. (not shown). A bobbin 5 is fitted onto the rotary holder 3 and carries inelastic yarn for forming the coated coil.

The assembly of hollow shaft 2, rotary holder 3 and bobbin 5 forms a spindle, two stacked spindles being provided for each elastic thread to be coated.

One spindle rotates in the S-twist direction and the other spindle rotates in the Z-twist direction. The order of these two rotation directions may be either.

The rubber-elastic thread E to be coated is fed in the form of a ribbon through a feeder consisting of a plurality of rollers 6 and a comb 7, where it is divided into individual threads, each thread being fed to a coiling unit. . This individual thread E is the first boot U 8
A first coil of inelastic thread is wound several times around the hollow shaft 2 and then inserted into the axle of the hollow shaft 2, further passed through the first spindle 5 and unwound from the bobbin 5 of the first spindle 5 at its exit. The threads are combined with the covering R1.

Thereafter, the rubbery thread E provided with the first coating R1 passes through a second spindle Z, which is placed at a suitable distance above the first spindle 5 and rotates in the opposite direction. On exiting the second spindle Z, the rubbery thread E is combined with a second covering R2 consisting of a coil of inelastic thread that is unwound from the bobbin 5 of the second spindle Z, and then past the first pulley 8. It is wound several times around the 21st-reel 9, which is rotating at a slightly faster speed. This rotational speed difference provides a constant elongation and tension of the elastic thread E during the coating operation.

What has been described so far generally relates to the operation of conventional coiling equipment. However, according to the invention, one or more non-elastic, semi-rigid or crimped threads A1. drawn from a suitable supply cone 10, 10'. A2 is combined in parallel with the stretched rubber-like elastic thread E, and the coated coil R1
, R2, and the resulting thread is finally taken up and wound onto rollers 11, where the composite thread thus produced is no longer under tension and is now under tension.
．． During the interval 9, the rubber-like thread E is loosened by the amount stretched,
This combines non-elastic, semi-rigid or crimped yarn A
Innumerable small wrinkles and curls Ap and An are generated on l and A2.

When only yarn AI is combined, yarn of type (a) described above is obtained, and when only yarn A2 is combined, yarn of type (b) is obtained. When yarns AI and A2 are combined, type (c) yarn is obtained.

In this way, it is possible to obtain yarns with outstanding novel properties consisting of inelastic, semi-rigid or crimped yarns combined with elongated rubbery yarns.

The yarn is entirely coated and balanced with coils of inelastic yarn, exhibiting a controlled and limited elongation or elasticity in use, and a constant elongation with winding conditions.

Thus, it is possible to obtain a soft winding on the rubbery thread and a constant elongation of the inelastic, semi-rigid or crimped thread combined parallel to the covered elastic thread as described above. Because of these properties, maximum tension can be imparted to the finished thread without having to overtighten the rubbery thread or coil by prefixing the desired elongation. The number of threads forming this composite thread can vary. Thus, the rubber-elastic yarn E can be composed of one, two or more parallel yarns, while the inelastic, semi-rigid or crimped yarn A can be composed of one, two or more parallel yarns. It can be constructed from inelastic threads. The number of threads forming each coil R1, R2 can also vary, ie each coil R1, R2 may be composed of the same or different numbers of inelastic threads. Second, the winding may be done in only one direction, in which case the coiling device only needs to have a single spindle.

Two examples of yarns produced by the aforementioned method (a), i.e., by combining inelastic, semi-rigid or crimped yarns Al in parallel before the coiling operation is carried out, are shown in FIGS. 1 to 4. It is shown. When the thread is in a relaxed state, the elastic thread 4 causes wrinkles or curls AP to occur in the inelastic, semi-rigid or crimped thread At arranged in parallel; on the other hand, when the thread is in a tension state during use. The maximum elongation is limited by the maximum elongation length of the combined inelastic, semi-rigid or crimped yarn Al.

Figures 5 to 8 show two yarns produced by the method (b) described above, i.e. by combining inelastic, semi-rigid or crimped yarns A2 in parallel before the final coiling operation is carried out. Two examples are shown.

When the thread is in the relaxed state, a loop A2 is created by the elastic thread E in the inelastic semi-rigid or crimped thread A2 arranged in parallel, while in the tensioned state in use , whose maximum elongation is determined by the maximum elongation length of the combined inelastic, semi-rigid or crimped yarn.

Those skilled in the art will readily recognize several applications and advantages of this controlled elasticity yarn. It will also be understood that many modifications, additions and/or substitutions of elements may be made without departing from the spirit and scope of protection of the invention.

[Brief explanation of the drawing]

Figure 1 shows the relaxed state of a piece of a single elastomeric yarn covered with a coil of inelastic yarn and combined in parallel with a single inelastic, semi-rigid or crimped yarn before the coiling operation. 2 is a side view of the elastic yarn of FIG. 1 in tension; FIG. 3 is a side view of the elastic yarn of FIG. FIG. 4 is a side view of the elastic thread of FIG. 3 in a taut state; FIG. of a single elastomeric yarn covered with a coil of elastic yarn and combined in parallel with a single inelastic, semi-rigid or crimped yarn after the first coiling operation and before the last coiling operation 6 is a side view of the elastic thread of FIG. 5 in a taut state; FIG. 7 is a side view of the elastic yarn of FIG. 5 in a tensioned state; FIG. and a side view in a relaxed state of a portion of a double elastomer-elastic yarn combined in parallel with a single inelastic, semi-rigid or crimped yarn before the final coiling operation; FIG. 8 is in a tensioned state; A side view of the elastic yarn of Figure 7 and Figure 9 shows a method of combining one or more inelastic, semi-rigid or crimped yarns with an elastic yarn to provide limited elasticity. FIG. 2 is a schematic partial cross-sectional view of a coiling device modified as described above. ■...Frame 2...Hollow shaft 3...Rotating holder 4...Drive belt 5...Bobbin, spindle 6...Roller 7...Comb E...Rubber-like elastic thread 8. 9...11th-ri R1...First coating R2...Second coating Z...Second spindle

Claims (1)

[Claims] 1. A rubber-like elastic thread covered with a coil of inelastic thread, which comprises one or more elastic threads stretched at a predetermined elongation during the coiling operation; consisting of one or more inelastic, semi-rigid or crimped threads arranged in parallel;
Entirely coiled, the elastomer-elastic yarn, once relaxed, will only stretch in use by an amount determined by the length of the inelastic yarn in combination. A rubber-like elastic thread characterized by: 2. The rubber-like elastic yarn according to claim 1, wherein the coil is composed of the same or different numbers of inelastic yarns oriented in opposite rotational directions. 3. Claim 1, characterized in that the inelastic, semi-rigid or crimped yarn is placed around the elastic yarn before a coil is formed and is covered by all the coils. Or the rubber-like elastic thread described in item 2. 4. A patent characterized in that the inelastic, semi-rigid or crimped yarn is arranged after the first coil is wound and before the last coil is wound, so that there is a large degree of freedom in generating wrinkles and curls. A rubber-like elastic thread according to claim 1 or 2. 5. Rubber-like elastic yarn according to claim 1 or 2, characterized in that the inelastic, semi-rigid or crimped yarn is arranged under each coil. 6. A method for producing a rubber-like elastic thread with limited elasticity coated with a coil, the rubber-like thread being maintained at a predetermined amount of elongation during the coiling operation, in which one or more inelastic, semi-rigid, or crimped yarns are combined in parallel, and the composite yarn is then relaxed to create a number of wrinkles, curls, and loops in the combined inelastic, semi-rigid, or crimped yarns; A method for producing a rubber-like elastic thread, characterized in that when it is stretched during use, a predetermined permissible elongation is given to the elastic threads combined in parallel to the elastic thread. 7. A method as claimed in claim 6, characterized in that the predetermined elongation of the elastic yarn during the coiling operation is caused by a difference between a low yarn feed rate and a high yarn withdrawal rate. 8. Claim 6, characterized in that an inelastic, semi-rigid or crimped yarn is placed around the elastic yarn before the coiling operation and is covered by all the coils.
or the method described in paragraph 7. 9. A patent claim characterized in that the inelastic, semi-rigid or crimped yarn is arranged after the first coiling operation and before the last coiling operation, so that there is a large degree of freedom in the generation of wrinkles and curls. The method described in item 6 or 7 of the scope. 10. A method as claimed in claim 6 or claim 7, characterized in that an inelastic, semi-rigid or crimped thread is placed below each coil. 11. Apparatus for producing coil-covered elastomer-like elastic threads of limited elasticity, comprising one or more coils of inelastic thread for winding coils of inelastic thread on one or more elastic threads. a coiling device comprising stacked spindles, said device comprising means for combining one or more inelastic, semi-rigid or crimped yarns parallel to said elastic yarn, and during the coiling operation; and means for placing the elastic thread under limited elongation. 12. Said means for combining an inelastic, semi-rigid or crimped yarn parallel to an elastic yarn, comprising one or more bobbins for said inelastic yarn and one or more spindles for winding a coil. 12. A device according to claim 11, further comprising means for guiding and driving a non-elastic, semi-rigid or crimped thread into the hole. 13. During the coiling operation, said means for placing the elastic yarn under limited tension consist of two pulleys for winding the yarn, one of which is placed in front of the yarn entry of the spindle and rotates at a low speed. , the other pulley is arranged before the take-up roller at the yarn outlet of the spindle and rotates at a higher speed than the first pulley, thereby effecting a limited elongation of the elastic yarn. Apparatus as described in paragraph 11.