JPH0340849Y2 - - 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 thread-like body such as a glass fiber thread.

<Prior Art> This forming tube is attached to the outer periphery of a core 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.

<Problems to be solved by the invention> However, forming tubes made of nonwoven fabric in general have the following problems due to their weak stiffness. That is, as shown in FIG.
The forming tube a formed by winding is hung on a hanger f and dried. However, since this drying process takes a long time (approximately 6 to 13 hours),
Due to the weight of the glass fiber yarn e, a change occurs over time in which the entire yarn becomes sagging in an egg shape as shown by the two-dot chain line.

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 is caused by the fact that when each forming tube a is removed from the hanger f after drying, or when it is transferred on a trolley, the fiber yarn slides from the egg-shaped tube, causing the yarn in the inner layer to slip. This can cause the yarn to become unrolled or become tangled.

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

In the present invention, the forming tube is constructed by winding a nonwoven fabric a plurality of times. The starting end of the inner periphery and the ending end of the outer periphery of this nonwoven fabric are arranged at approximately the same position via the nonwoven fabric of the intermediate periphery, and
Both the starting end of the inner circumference and the end of the outer circumference of the nonwoven fabric are oblique to the axial direction of the tube, and in addition, the nonwoven fabric on each circumference is joined by a linear adhesive portion.
The linear bonded portion includes a bonded portion formed by a single linear heat seal extending obliquely to the axial direction, and the bonded portion formed by this single linear heat seal allows the inner surface to be bonded. The nonwoven fabrics on each circumference including the starting edge and the ending edge of the outer circumference are joined.

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.

<Effect> The above measures produce the following effects.

In the present invention, the linear bonded portion includes a linear heat-sealed portion extending obliquely to the axial direction, and the linear bonded portion includes a linear heat-sealed portion extending obliquely to the axial direction. Since the nonwoven fabrics on each circumference including the inner circumference start and outer circumference end are joined, the bonded part by this heat sealing is
It extends in the combined direction of the circumferential direction and the axial direction of the tube. Thereby, this joint portion becomes the skeleton of the tube and effectively acts to maintain its roundness. As a result, it is possible to prevent the forming tube from deforming into an egg shape during drying, and it also prevents the yarn from collapsing or becoming entangled when it is removed from the hanger after drying, reloaded to a trolley, etc., or transported. Can be effectively prevented.

Incidentally, when the forming tube is bent at a bending point extending in the axial direction, it is conceivable that a load is applied to the joint portion due to the difference in the curvature of each circumference. However, in the case of this forming tube, the nonwoven fabric 2 on each circumference including the inner peripheral start end 21 and the outer peripheral end 22 is adhered by linear heat sealing, and each of the nonwoven fabrics 2 adjacent to this adhesive point The surrounding nonwoven fabric is not bonded. Therefore, as shown in Figure 5, the nonwoven fabrics on each circumference adjacent to the bonding point are not bonded, and due to the difference in circumferential ratio, there is a slight gap, and this gap causes the heat seal. It is possible to prevent unnecessary force from being applied to the bonded portion 23 due to the above. As a result, it is possible to prevent peeling of the bonded portion and occurrence of raised edges.

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, the starting end 21, which should be located on the inner periphery, and the terminal end 22, which should be located on the outer periphery, are each cut diagonally at an angle of about 45. Therefore, when this is wound in the winding direction of the arrow x, both ends 21 and 22 will obliquely intersect with the axial direction y of the tube, which is perpendicular to the winding direction x.

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 lines 4 and 5 on the front surface 3 is the same as that of the uneven lines 7 and 5 on the back surface 6.
8 is made smaller by the formation interval. Incidentally, since these uneven stripes are formed by embossing, the concave portions 7 and 8 have a small thickness and are denser than the convex portions 5 and 8.

The tube 1 is formed by flatly winding the nonwoven fabric 2 two times (or three or more times). The starting end 21 of the inner circumference and the terminal end 22 of the outer circumference of the nonwoven fabric 2 are arranged at substantially the same position and are joined by one heat-sealed 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 has an inner peripheral start end 21 and an outer peripheral end 22.
and the nonwoven fabric 2 that will be located inside each are joined by high frequency heating, and the thickness is slightly smaller and stiffer than the non-heat sealed part, but the edges 21 and 22, especially the outer peripheral end 22, are bonded to each other by high frequency heating. It has the advantage that it is almost flush with the surface of the nonwoven fabric and does not form large steps. In particular, when winding glass fiber yarn in an unstable state, if the outer peripheral end 22 protrudes, the yarn will take on the shape of the protruding end.
It also causes the occurrence 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 gently curved surfaces so as not to form sharp steps. In particular, it is desirable to keep the surface side of the tube smooth compared to other non-heat-sealed parts to avoid dents as much as possible.

As described above, the heat-sealed portions 23 at each end of the inner peripheral start end 21 and outer peripheral end 22 of this forming tube intersect diagonally with respect to the axial direction y of the tube. Therefore, the hardened heat-sealed portion 23 extends in the combined direction of the axial direction y of the tube and the circumferential direction (winding direction x) of the tube. As a result, the heat-sealed portion 23 becomes the skeleton of the tube and exerts an effective function to maintain its roundness. Therefore, it is possible to prevent the tube from sagging or wrinkles even when the glass fiber yarn is drying.

In the above embodiment, the slope of each end 21, 22 is approximately 45
Although this angle is a straight line, the angle can be changed freely, or it may be a curved line as shown in Figs. Parallel parts may also be included. Further, in the above embodiment, the inner circumferential starting end 21 and the outer circumferential terminating end 22 are arranged at substantially the same position, but these 21 and 22 may be arranged at different positions. At that time, it is necessary to place a linear adhesive part 23 on the outer peripheral end 22 side,
Others may be changed freely.

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 replaced by the convex portions 5, 8. The density is higher than that of the previous year. Therefore, the strength of the entire tube can be increased, and it can also be used when drying glass fiber threads.
It is possible to prevent changes over time such as drooping in an egg shape. Moreover, 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 y in FIG. 4). In addition, Jitsugan 1986-
As proposed in No. 1767745, adhesive may be applied only to the convex portions 5 and 8 to partially adhere the nonwoven fabric on each circumference. 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. 8, at least one heat-sealed adhesive portion 24 may be disposed along the circumference of the tube. Although not shown, one or more spiral adhesive portions extending in the same direction or in the opposite direction to the linear heat seal portion 23 may be provided. Although not shown, one or more spiral adhesive portions extending in the same direction or in the opposite direction to the linear adhesive portion 23 may be provided. Thereby, the rigidity of the tube as a whole can be increased, and the effect of preventing the glass fiber yarn from sagging and wrinkles when drying can be further enhanced.

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

<Effect of the invention> In the present invention, the heat seal portion 23 is
It extends in the combined direction of the axial direction y of the tube and the circumferential direction (winding direction x) of the tube. As a result, the heat-sealed portion 23 becomes the skeleton of the tube and exerts an effective function to maintain its roundness. Therefore, even when the glass fiber yarn is dried, it is possible to prevent the tube from hanging down in an egg-shaped manner and from generating wrinkles. This prevents uneven tensile force from being applied to the unstable glass fiber yarn during drying, makes it possible to obtain glass fiber yarn with a uniform thickness, and prevents the yarn from curling during transportation after drying. It is preventable.

[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, Figs. 6 and 7 are surface views of nonwoven fabrics of other embodiments, and Fig. 8 is a perspective view of the forming tube of another embodiment. FIG. 9 is an explanatory diagram of a state in which glass fibers wound around a forming tube are being dried. 1... Forming tube, 2... Nonwoven fabric,
21...Inner circumference start end, 22...Outer circumference end, 23,2
4...Heat seal part.

Claims (1)

[Claims for Utility Model Registration] A deformable forming tube mainly made of nonwoven fabric for winding a filamentous material such as glass fiber yarn, in which the forming tube is constructed by winding the nonwoven fabric multiple times. The inner circumferential starting end and the outer circumferential ending of the nonwoven fabric are arranged at approximately the same position via the intermediate circumferential nonwoven fabric, and both the inner circumferential starting end and the outer circumferential ending of the nonwoven fabric are aligned in the axial direction of the tube. In addition, the nonwoven fabrics on each circumference are joined by a linear adhesive part, and the linear adhesive part is a single linear adhesive extending obliquely to the axial direction. 1. A forming tube comprising a heat-sealed bonding portion, wherein nonwoven fabrics on each circumference including an inner circumference starting end and an outer circumference end are joined by this single linear heat seal.