JP2987463B2 - Method of manufacturing elastic fiber wound yarn - Google Patents

Description

The present invention relates to a method for producing an elastic fiber wound yarn. More specifically, the winding hardness of the elastomeric elastic fiber wound body wound on the core tube is reduced, or the lance fur tail is attached, the core tube is replaced, or the winding yarn is wound on the core tube. The present invention relates to a method for manufacturing an elastic fiber wound yarn capable of moving a layer.

B. Conventional technology There are various methods for winding synthetic and natural fibers including elastomeric elastic fibers on a core tube, and it is possible to freely adjust the hardness of a winding layer. In order to reduce the hardness of the wound yarn layer wound into a soft yarn layer, a rewinding process had to be performed.

Also, take-out of the yarn end wound first on the core tube, that is, transfer tail unwinding, is not necessary if the winder is equipped with the necessary equipment, but is not equipped with a tail take-up device It was not possible to remove the tail from a machine-wound and therefore untailed winding.

Furthermore, if the yarn layer of the wound yarn wound on the core tube is not located at the center of the core tube and is unbalanced, the yarn layer may be damaged during packing / transportation. As a result, the yarn layer could not be moved to the center of the core tube.

In addition, it was not possible to replace the core tube with another type according to the requirements of the next processing step.

C. Problems to be Solved by the Invention The object of the present invention is to solve the above-mentioned conventional problems, to reduce the hardness of the winding layer, to enable so-called softening, It is an object of the present invention to provide a method for producing an elastic fiber wound yarn whose main object is to obtain.

D. Means for Solving the Problems The present invention has the following configuration to achieve the above object.

That is, the wound body in which the elastic fiber is wound around the core tube is cooled to a temperature at which the elastic modulus of the elastic fiber suddenly changes, the core tube is removed in a cooled state, and then the core tube is inserted again. Alternatively, there is provided a method for producing an elastic fiber wound yarn, wherein the elastic fiber layer is returned to room temperature without insertion.

Below, mainly spandex fiber as an example,
Although described, the present invention is not limited to spandex fibers, but is also widely applicable to fibers exhibiting rubber-like elasticity, such as polyester ether-based elastic fibers.

The spandex fiber with a core tube to which the cooling method of the present invention can be applied is suitable as an elastic yarn, and is not particularly limited as long as it is a polyurethane fiber obtained by a known method.

The polyurethane referred to herein is generally obtained by reacting a diisocyanate with a polymer having two or more terminal hydroxyl groups, if necessary, together with a polyfunctional active hydrogen compound.

A polymer such as a polyurethane or a polyester ether-based melt-spun elastomer synthesized as described above is spun by a known melting, dry, or wet spinning method. After adhering 0-15% of a mineral, silicone or mixed oil containing additives such as an anti-stick agent between yarns and a smoothness promoter so that the yarn can be fed continuously. An elastic fiber obtained by winding a yarn with a winding machine in a state where a thread is stretched 0.98 to 1.30 times on a core tube made of paper, thermoplastic plastic, or the like, which is generally referred to as a core tube. It is preferable that the weight of the wound yarn is 50 to 7000 g or the thickness of the wound yarn layer is in the range of 10 to 200 mm.

Surprisingly, the present invention can be applied even to a spandex fiber to which no oil agent has been applied and therefore has extremely poor smoothness, and has exerted an excellent effect.

The most common shape of the core tube is a cylindrical shape, but a conical core tube is also applicable.

Similarly, the shape of the winding thread can be any of a cylindrical shape, a conical shape, a biconical shape, and the like.

On the other hand, the cooling treatment method may be any method as long as the core tube-wound yarn can be cooled by a container capable of maintaining the temperature within a range of -5 ° C to -40 ° C or a facility capable of continuously supplying the core tube-wound yarn.

The freezer of an electric refrigerator for home appliances is kept at -18 ° C, and can be suitably applied to the present invention.

Although the method of the present invention can be carried out even at a temperature higher than -5 ° C, the core tube cannot be extracted in a temperature range exceeding 0 ° C.
It is desirable to set the upper limit to ° C.

This maximum temperature depends on the type of elastomer,
Although it can be determined by measuring the viscoelastic properties, -5 ° C. is suitable for ordinary polyurethane fibers. The temperature can be determined in consideration of a variation factor of about 5 ° C. in consideration of the temperature at which the elastic modulus suddenly changes during the measurement of the viscoelasticity.

The lower limit temperature is not limited in principle, but is preferably about −40 ° C. from a practical and industrial point of view.

The conditions for separating the wound yarn from the core tube are independent of the thickness of the yarn. The preferred cooling time varies depending on the combination of the winding thicknesses.

Although specific conditions will be clarified in Examples described later, a range of 5 minutes to 120 hours is preferably adopted.

As described above, the present invention cools the wound body in which the elastic fiber is wound around the core tube to a temperature at which the elastic modulus of the elastic fiber suddenly changes,
The core tube is withdrawn in a cooled state.

In order to reduce the hardness of the winding layer, so-called softening, by removing the core tube from the winding tube with the core tube and leaving the winding alone, the winding tension can be relaxed and the softening can be achieved. By re-inserting a core tube having a smaller diameter than the core tube, a softened core tube-equipped winding thread can be obtained.

Also, after removing the core tube, a tail portion of a required length is taken out from the innermost layer of the winding yarn, and the core tube is reinserted to obtain a tailed winding yarn.

Further, it is possible to move the wound yarn layer wound off the center of the core tube and return it to a normal position.

In addition, it is necessary to separate the core tube and the wound yarn quickly, and to make sure that the temperature of the yarn layer does not become higher than -5C. Furthermore, when cooling the yarn, if the yarn is held upright or obliquely, the yarn layer may be displaced from the core tube, so it is important to hold the yarn with the core tube horizontally.

The elongation state of the wound yarn is determined by the spinning conditions of the elastic fiber, and in order to realize good winding, the elongation ratio is preferably in the range of 0.98 to 1.30. Here, the elongation rate corresponds to the amount of shrinkage of the yarn when the wound yarn is unwound, and is obtained by unwinding and relaxing the circumference L of the surface layer of the wound yarn and the yarn on the surface once. L / L '.

In order to wind the yarn, the traverse called traverse is usually given to the yarn, so in spite of the fact that the yarn is actually stretched,
According to this definition, the elongation rate may be smaller than 1.

The method according to the invention can be applied preferably to rubber-like elastic fibers exhibiting elastomeric elastic behavior, in particular spandex fibers.

The spandex fiber to which the method of the present invention can be particularly suitably applied is an elastic yarn having the above-described composition and having high elasticity.

Example 1 A polytetramethylene ether diol as a soft segment and a 4,4'-diphenylmethane diisocyanate and ethylenediamine as a heart segment spandex fiber were prepared from an N, N'-dimethylacetamide solution.
70 denier was spun out by the dry spinning method.

A 10% mineral oil is adhered to the 70-denier spandex fiber, and a core tube with a core tube wound 500 g (48 mm in thickness) on a plastic core tube using a winder at an elongation of 1.15 times. After storing for 15 hours in a container whose temperature was controlled at 20 ° C., the core tube could be easily removed from the winding thread.
By taking out the yarn end from the inner surface of the wound yarn separated from the core tube with a length of 35 cm, inserting the concentric tube again and leaving it at room temperature for 24 hours, it is possible to make a cored core wound yarn with tail Was.

In addition, if the tailing process is not required and the winding yarn is shifted from the center of the core tube, the centering correction should be made by moving to the center of the core tube after the cooling process described above and then returning to room temperature. Was completed.

Example 2 With an elongation of 1.02 times and an oil diameter of 83
After cooling 3,000 denier (95 mm thick) 840 denier spandex fiber at -15 ° C for 8 hours on a 5 mm thick paper core tube, remove the core tube and remove the core tube to an outer diameter of 80 mm and a thickness of 3.5 mm. By replacing it with a paper core tube and returning it to room temperature, it was possible to make a soft package with the elongation rate of the winding thread reduced to 0.98.

Example 3 Outer diameter at 1.03 times elongation without applying oil to running yarn
79mm, 3100mm thick plastic core tube, 1100g (roll thickness 52
mm) 1120 denier spandex fiber
After cooling at 10 ° C. for 10 hours, the core tube was removed, the thread was removed 35 cm from the inner surface, and the temperature was returned to room temperature with only the wound thread, whereby a coreless soft package with a tail could be made.

E. Effects of the Invention According to the present invention, the following excellent operational effects can be obtained by the above configuration.

Until now, in order to reduce the hardness of the wound yarn layer once wound on the core tube and make it a soft yarn layer, rewinding has been used.
However, according to the present invention, the core tube is removed from the core tube-attached winding yarn and the winding yarn alone is released, thereby relaxing the winding yarn tension and making it softer. By re-inserting a core tube having a smaller diameter than the core tube, a softened core tube-attached winding thread can be obtained.

In order to take out the yarn end first wound on the core tube, that is, take out the transfer tail, it was essential that the winder be equipped with a tail taker with an expensive and sophisticated mechanism. According to the present invention, after the normal winding, the core tube is removed according to the present invention, the tail portion having the required length is taken out from the innermost layer of the winding yarn, and the core tube is reinserted to obtain the tailed winding yarn.

This allows the winding thread without tail, or
In the tail removal device, it has become possible to take out the tail from the winding thread, in which tail removal has failed.

Further, if the yarn layer of the wound yarn wound on the core tube is not located at the center of the core tube and is unbalanced, the yarn layer may be damaged at the time of packing / transportation. The wound yarn layer wound off the center of the core tube can be moved and returned to the normal position.

In addition, it is easy to replace the core tube with another type according to the requirements of the next processing step.

Claims (9)

(57) [Claims] A wound body in which elastic fibers are wound around a core tube is cooled to a temperature at which the elastic modulus of the elastic fibers suddenly changes, and the core tube is removed in a cooled state. A method for producing an elastic fiber wound yarn, wherein the elastic fiber layer is returned to room temperature without or with insertion. 2. A wound body in which an elastic fiber is wound around a core tube is cooled to a temperature at which the elastic modulus of the elastic fiber rapidly changes, and in a cooled state, the elastic fiber layer wound on the core tube is cooled. Moving the elastic fiber layer in the axial direction of the core tube, and then returning the elastic fiber layer to room temperature. 3. The method according to claim 1, wherein the innermost layer of the elastic fiber layer from which the core tube has been removed is taken out and used as a transfer tail. 4. The method for producing an elastic fiber wound yarn according to claim 3, wherein the core tube is inserted into the elastic fiber layer again to obtain a cored wound body with a transfer tail. 5. The method for producing an elastic fiber wound yarn according to claim 1, wherein a core tube having the same diameter or a smaller diameter is inserted into the elastic fiber layer again. 6. The method for producing a wound elastic fiber yarn according to claim 1, wherein the elastic fiber is polyurethane spandex. 7. The method for producing a wound elastic fiber yarn according to claim 6, wherein the elongation rate of the elastic fiber before the cooling treatment is 0.98 to 1.30. (However, the elongation rate corresponds to the amount of shrinkage of the yarn when the wound yarn is unwound, and the circumference L of the wound yarn surface layer and the yarn on the surface after being unwound one time and relaxed Ratio L / L /
L ') 8. The method for producing an elastic fiber wound yarn according to claim 1, wherein the cooling temperature is from -5 ° C. to -40 ° C. 9. The method for producing an elastic fiber wound yarn according to claim 1, wherein the winding yarn with the core tube is held horizontally during the cooling treatment.