JPH0328054Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a paper yarn winding tube. More specifically, the present invention relates to a yarn winding tube that has an improved bent portion, is simple and inexpensive to manufacture, and has good dimensional stability.

BACKGROUND ART In spinning, synthetic fiber spinning processes, drawing/twisting processes, and other fiber manufacturing processes, yarn winding tubes consisting of many paper tube bodies are used for winding fibers.

The yarn winding tube is manufactured by spirally winding cardboard around a mandrel, then spirally winding a surface sheet thereon, and then cutting the cardboard into a predetermined length.

However, when a yarn winding tube that has been cut to a predetermined length is used to release the yarn, the release yarn tends to get caught on the edge of the surface sheet, causing problems such as tension unevenness, fuzzing, or cutting. It is becoming the cause of
Therefore, various methods have been adopted to form the cross section of the end of the paper tube into an arc shape.

FIG. 1 shows a yarn winding tube 1 made of a paper tube body, which has been subjected to the so-called "tip bending" process, in which the end portion is pressed with a mold to form a circular arc portion 2.

In FIG. 2, the inner surface of the end of the yarn winding tube 1 is cut to form a thin wall portion 3, and this thin wall portion 3 is subjected to the conventional "tip bending" process.

The yarn winding tube made of a paper tube body shown in FIGS. 1 and 2 has its end section formed into a large ring shape, and fine particles are formed between the inner layer and the outer layer during processing. The bending shape and curvature become uneven due to the influence of the natural environment such as temperature and humidity, the stacking of cardboard layers, and conditions such as resilience, and the yarn wound on the yarn winding tube becomes uneven. It has the disadvantage that the tension of the yarn becomes uneven during unwinding.

In addition, peeling and cracking between each layer of the tip bending part may occur,
Tangle or peeling occurs from the outer surface layer, the yarn becomes slack, and this slack yarn gets caught at the tip of the bent part, causing single filament cracking in the case of multifilament.
This causes fuzzing, thread breakage, etc.

After all, if the end of the yarn winding tube is "bent" so that its cross section has a circular shape with a certain curvature as shown in Figures 1 and 2, the inner layer This causes minute "warps" or "misalignments" in the paper tube, and these minute defects cause delamination, which ultimately makes the paper tube unusable in a short period of time.

Furthermore, the process of bending the end of the yarn winding tube as described above has the disadvantage that the process is relatively complicated and the processing cost increases.

The present invention was devised in view of the drawbacks of the prior art, and is a yarn that is easy and inexpensive to manufacture, and has high dimensional stability without "shifting" or "cracking" of the paper layer at the bent end. The purpose is to provide a winding tube.

The present invention was obtained as a result of intensive studies to eliminate the drawbacks of the conventional paper tubes subjected to processing such as tip bending, and its structure is cylindrical and has a cardboard layer. , the thickness of the end of the paper tube is made thinner by providing an inclined surface at the inner circumferential end of the paper tube consisting of a surface sheet laminated on the surface thereof, and the thin portion is pressed. In particular, the outer peripheral end of the paper tube is compressed into an arc shape, and the end surface of the paper tube is covered by the surface sheet itself.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a cross-sectional view of the main part showing the manufacturing process of a yarn winding tube made of a paper tube body. First, the paper tube body is manufactured by a normal method, and then this paper tube body is lengthened to a predetermined length. The paper tube body 6 is obtained by cutting the paper tube body 6. And the paper tube body 6
An inclined surface 8 is formed on the inner surface of the end portion 7 of. When machining this inclined surface 8, a device such as a lathe is used,
It is preferable to perform processing such as chamfering.

This paper tube body 6 is constructed by spirally winding cardboard in multiple layers to form a cardboard layer 6a, and a surface sheet 6b is laminated on the surface of the cardboard layer 6a. This surface sheet 6b is made of a material that does not adversely affect the yarn wound on the yarn winding tube, and is not susceptible to cracking or wrinkles due to the bending process described below. It is desirable to select materials that do not cause

Although the inclined surface 8 is formed at one end of the paper tube body 6 as described above, the other end may have a normal cut shape.

Next, as shown in FIG. 4, a mold 9 is pressed into contact with the end portion of the paper tube body 6 processed as shown in FIG. 3, on which the inclined surface 8 is formed. In this process, the paper tube body 6
When the heated mold 9 is pressed while being supported by a spindle and rotated as shown by the arrow, the paper layer is guided by the molding groove 10 of the mold 9 and flows toward the slope 8 side, forming the molding groove 10. A circular arc portion 11 having a cross-sectional shape that matches is formed.

This arcuate portion 11 is densified by the mold 9, and the surface sheet 6b and the cardboard layer 6a form a layer 12 that flows toward the center of the paper tube body 6.

In this way, the yarn winding tube 13 which is the object of the present invention is manufactured. It flows unilaterally toward the center line of the arc portion 13, and the surface of the arcuate portion 11 is dense and smooth.

The shape of the layer 12 of the arcuate portion 11 is the inclined surface 8 in FIG.
There is a close relationship with this, and when the angle α of the inclined surface 7 is large, the bending angle of the layer 12 toward the center line of the paper tube becomes large. However, if this angle α is too large, the surface sheet 6b may be stretched and peeling may occur in the cardboard layer 6a near this surface sheet 6b. decided on.

5 and 6 show various embodiments for processing the paper tube of the present invention.

FIG. 5 shows the second embodiment, and A is the third embodiment.
This figure shows an inclined surface 8a having a larger inclination angle than the inclined surface 8 formed on the inner surface of the paper tube body 6, which is pressed using a mold 9 in the same manner as shown in FIG. When processed, an inclined surface 15 can be formed on the outer surface of the end of the yarn winding tube 13 as shown in Figure B.

The angle of the inclined surface 15 formed at this end is shaped to follow the thread path that the yarn passes through when it is unwound. It is possible to prevent the tension applied to the threads from increasing by preventing the threads from coming into contact with each other as much as possible. Further, the end of the yarn winding tube 13 is covered with a surface sheet 6b.

Even if the ends of the yarn winding tube 13 having the above structure are processed into an arc shape, the ends are not bent as shown in FIGS. 1 and 2, so delamination or cracking will not occur. .

FIG. 6 shows a third embodiment, in which a flat surface 8e is left and an inclined surface 8d is formed as shown in FIG. By pressing the paper tube body 6 having this end cross-sectional shape using a mold 10, the cross-sectional shape becomes a 1/4 arc as shown in Figure B. The arcuate portion 11 thus formed is entirely covered with the surface sheet 6b.

In the yarn winding tube 13 having the above-mentioned shape, the cardboard layer 6a flows inward due to the pressing process by the mold 9, but since this layer is pressed in the direction of the yarn, it is difficult to compare with a conventional paper tube. It has extremely high strength.

As described above, the inclined surfaces 8, 8 are formed on the end portion 7 of the paper tube body 6.
a, 8d, and press the inclined surfaces to form the circular arc portion 11, thereby forming the surface sheet 6b.
The cardboard layer 6a flows toward the center of the yarn winding tube 6 to form a circular arc portion 11, and the circular arc portion 11 is larger than that of a conventional paper tube body 6 which has been pressed. It is very smooth.

In particular, the paper tube 13 according to the present invention is processed so that the surface sheet 6b covers the end surface of the paper tube body 6.

As described above, the present invention has a cylindrical shape and is composed of a cardboard layer and a surface sheet laminated on the surface of the paper tube. By reducing the wall thickness at the end of the body and pressing the thin part, the outer peripheral end of the paper tube is compression-molded into an arc shape, and the end surface of the paper tube is formed by the surface sheet itself. Since it is covered, manufacturing of the yarn winding tube becomes very simple and the manufacturing cost becomes very low. In addition, there is no "slippage" or "cracking" of the paper layer at the end of the paper tube, and the product value is greatly improved, and the dimensional stability is also significantly improved.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views of essential parts showing the shape of the end of a conventional yarn winding tube made of a paper tube. Fig. 3 is a front view showing the paper tube body according to the present invention cut to a predetermined length, and Fig. 4 is a part of the paper tube body obtained by pressing the end portion with a mold. It is a front view cut away and shown. Figures 5A and B and Figures 6A and B show the inclined surfaces at the ends of the paper tube bodies according to the second and third embodiments, respectively, and the pressed surfaces formed by pressing the inclined surfaces with a mold. It is a figure which shows the cross-sectional shape of the obtained circular arc part. 6... Paper tube body, 6a... Cardboard layer, 6b... Surface sheet, 8... Inclined surface, 9... Mold, 10... Arc part, 11... Arc part, 12... Cardboard layer, 13
... Yarn winding tube.

Claims (1)

[Scope of utility model registration request] The wall thickness of the end of the paper tube is reduced by providing an inclined surface at the inner peripheral end of the paper tube, which has a cylindrical shape and is composed of a cardboard layer and a surface sheet laminated on the surface of the paper tube. The outer peripheral end of the paper tube body is compression-molded into an arc shape by pressing the thin walled portion, and the end surface of the paper tube body is covered by the surface sheet itself. .