JPS6315228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for tying yarns, and more particularly to a method for tying yarns in such a way that the knots do not come undone even when stretched before being cut, and the knots become undone when the yarns are cut to become the original yarns.

Glass roving is made by gathering a large number of glass monofilament glass strands in parallel without twisting, and can be used for resin reinforcement either in continuous form or in cut form. There is.

A typical example of the above is a method called filament widening, but the latter method is often used after cutting.

Even in the case of cutting and using the roving as described above, it is industrially necessary to cut the roving continuously in preform, spray-up, SMC manufacturing, etc. When performing this continuous cutting operation, the roving must be continuously supplied without interruption. Therefore, a large number of roving packages must be tied together beforehand. For this purpose, it is usually necessary to tie one end (end) of one roving to the other end (tip) of the next roving, but up until now, the usual method of tying this is called the so-called top knot. It had the following undesirable drawbacks.

That is, when the roving is cut with the above-mentioned top knot, in many cases, the knot is not loosened and is mixed into the resin, and is mixed into the resin during manufacturing, and then into the product. This leaves defects in the reinforced plastic molding.

A device invented to improve the above-mentioned defect is to branch one roving into two, combine one branched roving with a separate roving, and intertwine it with the other branched roving. . and,
The tip of each thread was threaded through a wafer formed at the end of a separate roving. Therefore, sufficient binding can be achieved while the tension is applied, but slack may occur when multiple connected roving package cages are piled up and packed, and the roving must be tied again during cutting. It had the disadvantage that when it was pulled, the strings came undone and the binding came undone.

As a result of various studies to solve the above-mentioned problems, the inventor of the present invention determined how to tie one end of one thread to one end of the other thread by dividing the tip end of one thread into two. This branched yarn is entwined with the other yarn, tied together to form a binding strand with the end of the other yarn and a part of the tip end of the branched yarn, and the other yarn is tied into this binding strand. The present invention has been proposed based on the discovery that the threads do not loosen by passing the end of the thread and the remainder of the end of the branched yarn in such a way that they become entwined.

To explain the structure of the present invention in detail based on the embodiment shown in the drawings, the tip side of the yarn (roving) 1 of one roving package A is branched from a branch point 2 to form branched yarns 1' and 1''. do.

The tip side of the yarn (roving) 3 of the other roving package B is aligned with one branched yarn 1' to form a bundled yarn 4. Then, this bundled yarn 4 and the other branched yarn 1'' are tied together in a single knot to form a knot 5 to make a sash 6. Then, the tip of the knot 5 of the other branched yarn 1'' Align the end of the other thread 3 (roving package B side) and make a binding sewage 7 with the two, and then
The ends of the bundled yarns 4 are passed through so as to be entangled with each other, and the ends of the yarns 3 and the ends of the branched yarns 1' are held and pulled, thereby tightening the binding wires 7 and completing the binding.

In the above embodiment, the binding strand 7 was explained as being formed by the end portions of the branched yarn 1'' and the yarn 3, but it may be formed together with the branched yarn 1'', or by forming both branched yarns. 1' and 1'' may be formed together.

Furthermore, examples of how to make wasa 6 are not limited to the above-mentioned embodiments, but are described in Japanese Patent Publication No. 49-41494,
No. 52-16743, Special Publication No. 54-24490, Special Publication No. 54-
Various means disclosed in No. 24491 and Japanese Unexamined Patent Publication No. 49-6051 can be used.

The present invention is constructed as described above, and by forming the binding wire for binding the tips together with the end portion of the yarn 3 and at least a part of the branched yarn, the binding wire 3 can be used even when no tension is applied. It is possible to maintain a bound state without loosening.

[Brief explanation of the drawing]

The figure is a perspective view showing an embodiment of the yarn binding method according to the present invention. In the figure, 1 is a thread, 1' and 1'' are branched threads, 3 is a thread, 4 is a bundled thread, and 7 is a binding thread.

Claims (1)

[Claims] 1. When tying one end of one thread to one end of the other thread, the tip side of one thread is divided into two to form a branched thread, and this branched thread and the other thread are intertwined. Form a binding strand with the end of the other yarn and a part of the tip of the branched yarn, and entangle the tip of the other yarn and the remainder of the tip of the branched yarn with this binding strand. A method of binding yarn characterized by threading it through.