JP2005145649A - Elastic yarn wound body having end yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic yarn wound body having no slit on a paper pipe surface causing lowering of the strength of the paper pipe to be used, and having an end yarn protruding from a yarn wound body end surface. <P>SOLUTION: In the elastic yarn wound body, an elastic yarn having 310 to 2480 dtex fineness is wound around the paper pipe in a form of cheese. No slit is provided on the surface of the paper pipe, the slit is provided between the paper pipes, and the end yarn protrudes from the yarn wound body end surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elastic bobbin that is supplied to a diaper production or a sock knitting machine.

In recent years, the demand for disposable diapers has increased, and in order to impart stretch properties to diapers, it is common to combine elastic yarns with nonwoven fabrics. In the conventional method for supplying elastic yarn during the production of diapers as described in Document 1, every time the elastic yarn being supplied is used up, the diaper production process is temporarily stopped and replaced with the next new elastic yarn. There is a problem that the production efficiency is lowered.
In order to solve this problem, in Reference 2, a wound thread body having a slit in the circumferential direction outside the wound width of the elastic thread of the paper tube used, and a tail thread formed by introducing an elastic thread at the beginning of winding into the slit. A feeding method for tying the tip of other elastic yarns was proposed. This solves the problem of requiring a process of stopping the diaper production process and replacing it with the next new elastic thread every time the elastic thread being supplied is used up. Since the strength is weakened by repeated reuse, the slit portion is deformed, and the elastic yarn is not wound and the tail yarn cannot be formed, which may increase the cost.
Japanese Patent Publication No. 5-50429 JP 2000-289931 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elastic bobbin that forms a tail thread without reducing the strength of the paper tube surface with respect to an elastic bobbin that is continuously supplied to a diaper production or a sock knitting machine.

The inventors of the present invention have made the present invention as a result of intensive studies in order to solve the above problems.
That is, the present invention
(1) An elastic bobbin obtained by winding an elastic yarn around a paper tube in a cheese shape, wherein the paper tube has no slit on the surface of the paper tube, and the tail thread protrudes from the end surface of the wound body. body,
(2) The elastic thread wound body according to (1), wherein the fineness of the elastic yarn is 310 to 2480 dtex.
(3) The elastic bobbin according to (1) or (2), wherein a slit is provided between the paper tube to be used, and an elastic yarn at the beginning of winding is sandwiched between the slits to form a tail yarn. A method of producing a thread,
(4) The paper tube surface to be used has chamfers at the outer peripheral corners of the both end surfaces, and an elastic yarn at the beginning of winding is sandwiched between the chamfered paper tube and the paper tube to form a tail thread. The method for producing an elastic bobbin according to (3),
(5) The above-mentioned (3), characterized in that there is a step which becomes thinner on the surface side of both end faces of the paper tube to be used, and an elastic thread at the beginning of winding is wound around the stepped surface where the paper tube becomes thinner to form a tail thread. ) A method for producing an elastic bobbin described in
(6) A cylindrical object is arranged between the paper tube to be used, and an end thread is formed by winding an elastic yarn at the beginning of winding around the cylindrical material between the paper tube and the paper tube. It is a manufacturing method of the elastic bobbin thread described in the above (3).

  The elastic bobbin of the present invention does not form the slit surface on which the tail thread is formed on the paper tube surface where there is a concern that the paper tube strength may be lowered, and thus has an effect of economy and productivity.

The present invention will be specifically described below.
The elastic bobbin of the present invention is characterized in that the tail thread protrudes from the end surface of the wound body without having a slit on the surface of the paper tube. Such an elastic bobbin is suitably obtained by forming slits between the paper tube and the paper tube, not the surface of the paper tube, and sandwiching the elastic yarn at the beginning of winding to form a tail thread. It is done. By having a slit between the paper tube, the deformation factor of the slit due to repeated reuse of the paper tube can be solved.
A specific example having a slit between a paper tube and a paper tube is shown in FIGS. FIG. 1 shows an example in which a plurality of paper tubes having chamfered outer peripheral corners on both ends are brought into close contact with each other and placed in a winder to have a slit between the paper tubes. FIG. 2 is an example in which a plurality of paper tubes having thin steps formed on the surface sides of both end faces are placed in close contact with each other and placed in a winder to have a slit between the paper tubes and the paper tubes. Furthermore, FIG. 3 is an example which has a slit between a paper tube and a paper tube by arrange | positioning the cylindrical object used as a spacer between a paper tube and a paper tube.

  By these methods, the elastic bobbin of the present invention in which the bottom thread is formed without having a slit on the surface of the paper tube can be suitably obtained. In particular, it is preferable to chamfer the outer peripheral corners of both end faces of the paper tube surface shown in FIG. Here, in addition to those shown in FIGS. For example, the end face of the paper tube may have a shape other than that illustrated, or a paper tube having a chamfered portion or step formed on the end face of the paper tube may be used only on one end. A paper tube having a step and a normal paper tube may be arranged next to each other. Furthermore, a paper tube having a chamfered portion on the end surface and a paper tube having a step formed on the end surface may be arranged next to each other. good. It is preferable to use the end face-shaped paper tube shown in FIG. 1 or 2 having the same shape on both end faces, because of the ease of processing the end face of the paper pipe and the troublesome work when placing the paper pipe on the winder.

In the slit between the paper tube of the present invention, the slit width is preferably 0.1 to 5 mm. If the slit width is 0.1 mm or less, the slit width is small with respect to the fineness of the elastic yarn, and there is a problem that the yarn is not easily caught in the slit. If the slit width is 5 mm or more, the yarn is wound at a constant speed. This is not preferable because there is a problem that a difference in rotation can be made and winding is not possible. The depth of the slit is not particularly limited as long as the tail thread portion can be wound around, but is preferably 0.5 to 5 mm from the strength of the end face of the paper tube.
Elastic yarns typically include organic diisocyanates and isocyanate-terminated prepolymers prepared with substantially linear polymeric diols, chain extenders and multifunctional active polyfunctional hydrogen atoms. It is obtained by dry spinning, wet spinning or melt spinning a polyurethane polymer having a urethane group in the molecule, obtained by reacting a terminal blocking agent having a reactive active hydrogen atom in one or more stages. is there.

The above-mentioned polyurethane polymer may optionally include an organic or inorganic compounding agent having a specific chemical structure used in known polyurethane polymer compositions, such as benzophenone compounds, benzotriazole compounds, hindered amine compounds. UV absorbers such as hindered phenol compounds; inorganic fine particles such as barium sulfate, zinc oxide, hydrotalcite; magnesium stearate, calcium stearate, polytetrafluoroethylene, organopolysiloxane, etc. An anti-sticking agent or the like can be appropriately blended.

Since the elastic yarn used in the present invention is mainly used for diapers, socks, and the like, it is preferable that the fineness is 310 to 2480 dtex in view of stretchability.
The elastic yarn used in the present invention attaches a finishing agent before being wound into a cheese. At this time, the processing agent used for the elastic yarn is mainly composed of silicon oil, mineral oil, modified polysiloxane, etc., but any one known to those skilled in the art can be used.
The elastic yarn to which the finishing agent is attached forms a tail yarn by sandwiching the elastic yarn at the beginning of winding into the slit between the paper tube to be used. The wound body from which the tail thread is obtained is supplied to a diaper manufacturing process or the like.

The present invention will be described based on examples.
[Example]
Using a polyurethane solution having a polymer concentration of 30 wt% using dimethylacetamide as a solvent, dry spinning was performed, and a finishing treatment agent was adhered at the time of spinning to obtain a polyurethane elastic yarn having a fineness of 620 dtex. At this time, using a paper tube with chamfered outer peripheral corners on both ends of the paper tube shown in FIG. 1, the paper tube and the paper tube are brought into close contact with each other to provide a slit having a width of 2.0 mm and a maximum depth of 1.5 mm. The test of inserting the first elastic yarn into the slit surface at a supply speed of 380 m / min and a winding speed of 385 m / min was repeated 50 times using the same paper tube. Further, the shape of the slit surface was visually determined every 10 times, and the results are shown in Table 1.

[Comparative example]
Using a polyurethane elastic yarn having a fineness of 620 dtex as in the example, and using a paper tube having a slit in the circumferential direction outside the wound width of the elastic yarn on the surface of the paper tube, The test of sandwiching the elastic yarn between the slit surfaces was repeated 50 times using the same paper tube. Further, the shape of the slit surface was visually determined every 10 times, and the results are shown in Table 1.
From Table 1, in the example, regardless of the repeated use of the paper tube, the shape of the slit surface is good, and the state of being wound around the slit surface is also stably successful. On the other hand, in the comparative example, the shape in the vicinity of the slit surface is deformed while the paper tube is being used repeatedly, so that the failure of the winding of the slit surface frequently occurs each time the winding is repeated.

  The elastic bobbin of the present invention can be suitably used in fields such as diaper manufacturing and sock knitting manufacturing.

An example of a method for producing an elastic bobbin of the present invention, a plurality of paper tubes having chamfered outer peripheral corners on both end faces are placed in close contact with each other to be placed between the paper tube and the paper tube. It is an example which has a slit. An example of a method for producing an elastic bobbin of the present invention is a method of manufacturing a paper tube and a paper by placing a plurality of paper tubes formed with thin steps on the surface side of both end faces in close contact with each other and placing them on a winder. It is an example which has a slit between pipes. It is an example which has a slit between a paper tube and a paper tube by arrange | positioning the cylindrical object used as a spacer between a paper tube and a paper tube which is an example of the manufacturing method of the elastic bobbin body of this invention.

Explanation of symbols

1 Paper tube 2 Chamfered portion 3 Stepped portion 4 Cylindrical object

Claims (6)

  An elastic bobbin obtained by winding an elastic yarn around a paper tube in a cheese shape, wherein the paper tube surface does not have a slit, and a tail thread protrudes from the end surface of the wound body.   The elastic bobbin according to claim 1, wherein the fineness of the elastic yarn is 310 to 2480 dtex.   3. The method for producing an elastic bobbin according to claim 1 or 2, wherein a slit is provided between the paper tube to be used, and the elastic yarn at the beginning of winding is sandwiched between the slits to form a tail yarn.   4. A chamfer is formed at the outer peripheral corners of both ends of the paper tube surface to be used, and an elastic thread at the beginning of winding is sandwiched between the chamfered paper tube and the paper tube to form a tail thread. A method for producing the elastic bobbin described above.   4. The elasticity according to claim 3, further comprising a step which is thinned on the surface side of both end faces of the paper tube to be used, and winding an elastic thread at the beginning of the winding around the thinned step surface of the paper tube to form a tail thread. A method for producing a bobbin thread body.   4. A cylindrical article is disposed between the paper tube to be used, and an elastic thread at the beginning of winding is wound around the cylindrical article between the paper tube and the paper tube to form a tail thread. A method for producing the elastic bobbin described above.

Images