JPH0537974Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is applicable to bending the end of a paper tube and winding the yarn.
The present invention also relates to a yarn winding paper tube that is effective for unwinding.

[Conventional technology]

Conventionally, in order to improve the unwinding property when rewinding a wound yarn, a so-called tip-bent paper tube has been used in which the head end of the paper tube is bent inward.

One of them is Jikkoi No. 2-3472, No. 4.
As shown in the figure, the inner side of the end of the paper tube main body 11 is formed into a substantially L-shaped cut surface consisting of a stepped portion 14 and a thin walled portion 15, and the thin walled portion 15 is bent inward to form the stepped portion 14.
There is something that is closely attached to

Alternatively, as shown in FIG. 5 of Japanese Utility Model Publication No. 55-54688, the inner paper layer portion at the end of the paper tube main body 11 is cut off to form the outer paper layer portion 12. , a sloped portion 13 that slopes from the inner peripheral lower end of the outer peripheral side paper layer portion 12 toward the inner peripheral surface of the paper tube main body 1;
There is one in which the outer paper layer portion 12 is bent inward to form a bent portion 14.

[Problem that the invention attempts to solve]

However, these paper tubes have the following problems when subjected to recent yarn processing, that is, high-speed false twisting processing.

In other words, it is preferable that the inner diameter of the paper tube is d±Δd ₁ between the inner diameter of the head and the inner diameter of the bottom, which is extremely effective because the same holder for holding the paper tube can be used. Since the machining consisted of only the outer cut-out residual portion, the dimensional accuracy of the inner diameter was poor, and the inner diameter had variations of d±Δd ₂ and d±Δd ₃ , so that accurate dimensional accuracy was not always achieved.

In addition, after the end of the paper tube is bent, a force may be generated that causes the bent portion of the paper tube to return to its original shape during use or transportation, resulting in deformation and variations in length.
∆l ₁ < ∆l ₂ or ∆l ₃ , and the dimensional accuracy was not good.

In addition, since the yarn may come into contact with the inner and outer end surfaces, it is necessary to round the inner and outer end surfaces beautifully. Wrinkles occur at the tip of the part,
The threads sometimes got caught in the wrinkles.

Furthermore, conventional paper tubes indicated the type of yarn by the color or pattern of the outer layer.
Recently, there has been a problem that it has not been possible to adequately respond to the need for further subdivisions due to small lots.

The present invention was developed in view of the above-mentioned problems, and is a yarn winding system that improves the accuracy of the inner diameter and length of the paper tube body, increases strength, and improves yarn stand when unwinding the yarn. It provides paper tubes.

[Means for solving problems]

In order to achieve the above object, the thread-wound paper tube of the present invention has a thick end portion of the paper tube main body cut out in a stepped concave shape to form a thin outer layer portion and a thin inner layer portion. Bend each thin part toward the resection surface,
A bent end portion is formed and the bent end portions are brought into close contact with each other.

Further, the end face processing is performed on both end faces of the paper tube main body.

[Effect]

By bending the outer layer thin wall portion 3a and the inner layer thin wall portion 4a toward the cutting surface side to form bent portions 3b and 4b, and bringing the bent portions 3b and 4b into close contact with each other, the strength of the paper tube main body 1 is increased. The accuracy of the length dimension and inner diameter dimension of the paper tube body 1 is improved, and since there is no folded part inside the paper tube body 1, threads are not caught. In addition, the close contact area between the outer layer 3 and the inner layer 4 is the boundary line 5.
Therefore, the colors and patterns of the outer layer 3 and inner layer 4 can be represented by two or more colors, and the yarn count, type, manufacturing site, etc. can be easily determined.

〔Example〕

The drawings showing an embodiment of the present invention will be described below. 1 is a paper tube body made by bonding multiple layers of paper strips in a spiral shape, and the center part of the thick part of the head is formed into a concave cross-sectional shape at a predetermined depth. The cut surface 2 is recessed by cutting, and the outer layer 3 and the inner layer 4 are formed in thin parts 3a and 4a, respectively. The bottom 2a of the resection surface 2 is deep enough to maintain sufficient internal diameter and length accuracy when the thin outer layer 3a and the thin inner layer 4a are bent toward the resection side and brought into close contact with each other.

The outer layer thin wall portion 3a and the inner layer thin wall portion 4a are each bent toward the cut surface side to form tip bent portions 3b, 4b, and the tip bent portions 3b, 4b are brought into close contact with each other, with the close portion as a boundary line 5. outer layer 3 and inner layer 4
Colors, patterns, etc. can now be expressed in the form of two or more colors and patterns. The size of the radius of the inner and outer end surfaces formed by the tip bent portions 3b and 4b may be the same on the inner and outer sides,
It may also be different. Reference numeral 6 denotes a thread path provided at the other end of the paper tube main body 1 into which the end of the thread is inserted.

In addition, in the above embodiment, a case was explained in which the end surface was processed only on the head side of the paper tube main body 1.
The process is not limited to this, and may also be performed on the bottom side.

The thread-wound paper tube constructed in this way is designed to prevent the yarn from entering inside from the head of the paper tube body 1 due to uneven tension when winding the yarn around the paper tube body 1 or unwinding the wound yarn. There is no bend on the inside, so it won't get caught.

〔effect〕

In the present invention, the thick end portion of the paper tube main body 1 is cut out to have a concave cross section, and the thin outer layer portion 3a and the thin inner layer portion 4 are cut out.
a, and the thin parts 3a and 4a are respectively bent toward the cut surface side to form bent parts 3b and 4b, and the bent parts 3b and 4b are brought into close contact with each other. 3a and the inner thin wall portion 4a increase the strength of the head of the paper tube main body 1,
In addition, since the inner and outer layer surfaces are processed, the accuracy of the inner diameter and length of the paper tube body 1 is improved compared to the conventional processing of only the thin outer layer.

Moreover, since there is no folded part inside the paper tube main body 1, the yarn will not be caught. Furthermore, the outer layer thin section 3
The bending of a and the inner layer thin wall portion 4a can be arbitrarily processed depending on the material of the paper tube or the radius dimension of the end surface, and this can eliminate problems such as binding, cutting, etc. when unwinding the yarn. .

In addition, the close contact area between the outer layer thin wall portion 3a and the inner layer thin wall portion 4a becomes the boundary line 5, and by changing the color and pattern of the outer layer 3 and the inner layer 4, it is possible to determine the yarn count, type, etc. just by looking at the end face. Manufacturing sites, etc. can be easily determined, and subdivisions based on minimum lots can be handled.

Further, by processing the end faces on both end faces of the paper tube main body 1, it is convenient to check the display from both ends.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the paper tube of the present invention, Fig. 2 is a longitudinal cross-sectional view of the thick wall section, Fig. 3 is a longitudinal cross-sectional view of the paper tube after processing, and Fig. 4 and 5 are of the conventional paper tube. FIG. 1...Paper tube main body, 3a...Outer layer thin wall portion, 4a...
...Inner layer thin wall portion, 3b, 4b...Bending portion.

Claims (1)

[Claim for Utility Model Registration] The thick end portion of the paper tube main body 1 is cut out to have a concave cross-section to form a thin outer layer portion 3a and a thin inner layer portion 4a, and the thin portions 3a and 4a are cut out respectively. A yarn-wound paper tube characterized in that it is bent toward the surface to form bent end portions 3b and 4b, and the bent end portions 3b and 4b are brought into close contact with each other. A yarn-wound paper tube in which both end surfaces of a paper tube main body 1 are subjected to the end surface processing according to claim 1.