JPH038681Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a forming tube for winding a filamentous body such as a glass fiber yarn.

<Prior Art> This forming tube is attached to the outer periphery of a core body such as a drum in the spinning process of glass fiber yarn, and a filamentous body is wound around the outer periphery of the attached forming tube. and,
After winding, wrap the filament together with the forming tube.
It is removed from the core and dried, and after drying, a twisting process or roving is performed in which the yarn is wound onto another bobbin with a certain twist.

The forming tube that has been used once is then reused. In order to reduce the transfer volume, transportation to the reuse site is performed by bending a large number of forming tubes into a heart shape and inserting them into a single forming tube that maintains a cylindrical shape.

Then, at the reuse site, we take out the forming tube that has been bent into a heart shape.
It is used by twisting it into a cylindrical shape and attaching it to the drum again.

Conventionally, paper forming tubes have been widely used, but the applicant has previously developed a cylindrical forming tube made of nonwoven fabrics made of various fibers such as polyester, rayon, and vinylon. We proposed a new forming tube.

This forming tube made of nonwoven fabric has better air permeability than a tube made of paper, and has the advantage that the wound material such as glass fiber yarn can be dried uniformly and the drying time can be shortened. In addition, since it has good restorability and water/moisture resistance, it has the advantage of being more resistant to bending than paper tubes and can be reused more times.

However, forming tubes in general have the following problems. That is, as shown in FIG. 9, a forming tube a formed by winding a glass fiber thread e is hung on a hanger f and dried. However, this drying takes a long time (about 6 to 13 hours)
2 due to the weight of the glass fiber thread e.
As shown by the dotted chain line, a change occurs over time in which the entire body sag in an egg shape.

As a result, when the glass fiber yarn is in an unstable state, uneven tensile force acts on the wound glass fiber yarn during aging, causing the thickness of the fiber yarn to partially change. has. Further, due to the egg-shaped deformation, there is a problem in that the wound glass fiber yarn is unrolled. This unrolling occurs when removing each forming tube a from the hanger f after drying, or when transporting it on a trolley etc., the fiber yarn slips and moves, causing the yarn in the inner layer to unwind, or when the yarn is transferred. This can lead to entanglements.

Therefore, the applicant increases the stiffness of the forming tube by winding the nonwoven fabric multiple times, forms uneven stripes on the surface of the nonwoven fabric, and applies adhesive only to the convex portions. Utility Model Application No. 176,745/1982 proposed a forming tube made of nonwoven fabric that does not impair the good air permeability of the nonwoven fabric by partially bonding the nonwoven fabric around each circumference.

<Problems to be solved by the invention> However, in the case of the forming tube that was applied for earlier, adhesive is applied only to the convex portions of the nonwoven fabric for partial adhesion, so it is only necessary to apply an appropriate amount of adhesive. However, if there is too much adhesive, there is a problem in that the adhesive overflows and the partial adhesion becomes close to full adhesion.

Further, as described above, the forming tube is bent into a heart shape, inserted into a forming tube that maintains a single cylindrical shape, and transported. However, in the conventional forming tube, there is no guideline for bending, so it is difficult to bend, and the tube may be distorted in the axial direction. Furthermore, there is a risk that the partial adhesive may come off each time it is reused or transported.

<Means for Solving the Problems> Therefore, the present invention provides a deformable forming tube mainly made of non-woven fabric for winding filamentous bodies such as glass fiber yarn, which is characterized by the following configuration. The above-mentioned problems are solved by providing the following.

In the present invention, the forming tube is constructed by winding a non-woven fabric in multiple circumferences in flat winding, each circumference of the non-woven fabric is joined by a linear adhesive part, and at least one of the non-woven fabrics extends in the axial direction. The nonwoven fabric on each circumference, including the starting end of the inner circumference and the terminal end of the outer circumference, is joined by the adhesive portion of one linear heat seal.

Here, the term "forming tube that is deformable" refers to a forming tube that can be removed by changing the shape of the forming tube after winding the object to be wound.

<Effect> The above measures produce the following effects.

In the present invention, the forming tube is formed into a heart shape because the nonwoven fabric on each circumference including the starting end of the inner circumference and the end of the outer circumference are joined by the adhesive part of at least one linear heat seal extending in the axial direction. When folding, this adhesive part serves as a guide for the crease, and by pressing down on this adhesive part,
Can be bent easily and accurately.

Moreover, as a result of the inner peripheral start end 21, outer peripheral end 22, and nonwoven fabric 2 of each circumference being joined by at least one linear heat-sealed adhesive part, the nonwoven fabrics of each circumference adjacent to this joint point are joined. It is in a state where it has not been done. Therefore, as shown in FIG. 6, both sides of the heat-sealed portion 23 are bent to form a crease c. and,
Since the nonwoven fabrics on each circumference adjacent to this joining point are not bonded, there is a slight gap 25, 26 due to the difference in circumferential ratio. This escape can prevent excessive force from being applied to the bonded portion 23 due to heat sealing, and can prevent the bonded portion from peeling off or causing ridges.

Furthermore, since the nonwoven fabrics on each circumference are joined by linear adhesive portions, there are non-adhesive portions in this forming tube. Therefore, air can circulate well in the non-bonded portion, and the good air permeability, which is an advantage of the forming tube made of nonwoven fabric, is not impaired.

<Example> Embodiments of the present invention will be described below based on the figures.

FIG. 1 is a perspective view of a forming tube 1 according to an embodiment of the present invention, in which a sheet of nonwoven fabric 2 is formed into a cylindrical shape. This nonwoven fabric 2 is made mainly of various fibers such as polyester, vinylon, rayon, etc., and is preferably less flexible and stiffer than general nonwoven fabrics. As shown in FIG. 2, a large number of uneven stripes 4 and 5 are formed on the front surface 3 in parallel with the longitudinal direction, and on the other hand, as shown in FIG. The strips 7 and 8 are formed at an angle of about 40 degrees with respect to the longitudinal direction.

These uneven stripes 4, 5, 7, and 8 are formed on the surface of the nonwoven fabric by embossing, and as shown in the cross-sectional view in the tube axis direction in FIG. is deep, and the uneven stripes 7 and 8 on the back surface 6 are formed shallowly. Moreover, the interval between the formation of the uneven stripes 4 and 5 on the front surface 3 is the same as that of the uneven strips 7 and 5 on the back surface 6.
The formation interval of 8 is made small. In addition, since these uneven|corrugated stripes are formed by embossing, the concave parts 4 and 7 with a small thickness are denser than the convex parts 5 and 8.

The tube 1 is formed by flatly winding the nonwoven fabric 2 two times (or three or more times). The inner peripheral starting end 21 and the outer peripheral end 22 of the nonwoven fabric 2 are arranged on substantially the same radial line and are joined by one heat sealing portion 23 extending in the axial direction of the tube.
An enlarged view of this heat-sealed portion 23 is shown in FIG. This heat seal joins the inner peripheral start end 21, the outer peripheral end 22, and the intermediate nonwoven fabric 2 by high-frequency heating, and is slightly thinner and harder than the non-heat-sealed part, but the edges 21, 2
2. In particular, there is an advantage that the outer peripheral end 22 is substantially flush with the surface of the other nonwoven fabric, and no large step portion is formed. In particular, when winding a glass fiber yarn in an unstable state, if the outer peripheral end 22 protrudes, the shape of the protruding end will be attached to the yarn, which may lead to the generation of defective products. In this respect, heat-sealing the outer peripheral end 22 as in this embodiment is effective in solving the above problem. Note that it is desirable that the tips of the heat-sealing molds 31, 31 have a gently curved surface so as not to form a sharp step. In particular, it is desirable to keep the surface side of the tube smooth compared to other non-heat-sealed parts to prevent dents as much as possible.

At least one heat seal portion 23 may be provided, but as shown in FIG. 1, a plurality of heat seal portions 23' may be provided at appropriate intervals.

The forming tube consisting of the above configuration is
As shown in FIG. 8, when folding into a heart shape, the heat-sealed portion 23 can be folded as a central crease c, thereby making it easy to fold. In particular, since the heat seal portion 23 extends in the axial direction of the tube, it can be accurately bent without shifting in the axial direction.
This bending will be explained in detail based on FIG. 6. Both sides of the heat-sealed portion 23 are bent to form a crease c. Since these two sides are not heat-sealed, there is a slight gap 25 between the two wound nonwoven fabrics 2 and 2 due to the difference in circumference ratio. This relief can prevent the heat-sealed joint from coming apart due to excessive force being applied to the heat-sealed portion.

Although it is not an essential requirement of the present invention, as described above, uneven stripes 4, 5, 7, and 8 are formed on this nonwoven fabric 2 by embossing, and the concave portions 4, 7 with small thickness are formed in the convex portions 5, 8. It is more dense than 8. Therefore, the stiffness of the tube as a whole can be increased, and even when the glass fiber yarn is dried, it is possible to prevent the change over time of the glass fiber yarn from sagging in an egg shape. Furthermore, the uneven stripes 4 and 5 appearing on the surface are effective in preventing the glass fiber yarn e being wound from shifting in the tube axis direction (in the direction of the arrow in FIG. 4). Furthermore, as shown in FIGS. 1 and 4, by threading the thread 11 on the circumferential surface of the tube using a sewing machine, slippage of the glass fiber thread e can be more effectively prevented.

Furthermore, as shown in FIG. 7, at least one heat-sealed adhesive portion 24 may be provided along the circumference of the tube. This can increase the rigidity of the tube as a whole, and can prevent the glass fiber yarn from sagging or wrinkles when it dries.

In the above example, all the adhesive parts are heat-sealed, but the adhesive parts other than the starting end of the inner periphery and the end of the outer periphery can be changed to other adhesive means, such as using a hot melt adhesive. can.

<Effects of the invention> As described above, in the present invention, since the nonwoven fabrics on each circumference are joined by at least one linear adhesive portion extending in the axial direction of the forming tube,
When the forming tube is bent into a heart shape during transportation, the linear adhesive portion serves as a guide for bending, and by pressing this portion, the tube can be bent easily and accurately. Moreover, as shown in Figure 6, since the nonwoven fabric is folded along both sides of the linear adhesive part, the linear adhesive part itself does not bend, and the bond always remains stable and can be repeated repeatedly. This bond will not come off even when used.

Further, the nonwoven fabrics on each circumference are joined by the linear adhesive portions, and many other parts are not joined. Therefore, the air permeability of many non-bonded parts is not impaired at all, and the good air permeability, which is an advantage of nonwoven fabrics, is not impaired.

In addition, there is no need for fine manufacturing adjustments such as adjusting the amount of adhesive applied, which is required in the conventional case of applying adhesive only to the convex parts and joining, streamlining the forming tube manufacturing process. It is possible to achieve this goal.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a forming tube of one embodiment, FIG. 2 is a front view of the nonwoven fabric, FIG. 3 is a back view of the same, FIG. 4 is an enlarged view of the nonwoven fabric in an axial cross section of the forming tube, and FIG. Fig. 5 is an enlarged view of the heat-sealed portion seen from the end face of the forming tube, Fig. 6 is an enlarged view of the bent state of the heat-sealed portion, and Fig. 7 is a perspective view of the forming tube of another embodiment. FIG. 8 is an explanatory diagram of a state in which the forming tube is being transferred, and FIG. 9 is an explanatory diagram of a state in which the glass fibers wound around the forming tube are being dried. 1... Forming tube, 2... Nonwoven fabric,
21...Inner circumference start end, 22...Outer circumference end, 23,2
3', 24...Heat seal part.

Claims (1)

[Claims for Utility Model Registration] In a deformable forming tube mainly made of a nonwoven fabric for winding a filamentous material such as glass fiber yarn, the forming tube is formed by winding the nonwoven fabric in multiple flat wraps. The nonwoven fabric on each circumference is joined by a linear adhesive part, and at least one linear heat seal adhesive part extending in the axial direction connects the starting end of the inner periphery. A forming tube characterized in that nonwoven fabrics on each circumference including the outer circumferential end are joined.