JPS6014137B2 - Glass cloth manufacturing method that does not incorporate weft seams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention eliminates the weft seam by eliminating the striped yarn seam caused by the tail end while the loom is stopped when manufacturing glass cloth in an air jet loom. Regarding the manufacturing method of glass cloth.

In compound weaving, two to four bobbins are usually set on a bobbin stand using tail end yarns to save labor in supplying weft yarns.

This can be tied with compound weave, and usually 2
This is because it is thin, less than 0.00 denier (approximately 20 tex), and the knots are 4 mm, so the knots are not a quality problem at all. However, glass cloth, especially when used for printed circuit boards, has very strict quality requirements for reliability because it is used for computers.
The glass cloth was warped one by one, and out of 100, the defective one was 2.
Must be less than or equal to The two most common defects are dirt and bulk, and bulk defects are highly disliked because they damage the steel foil and cause the circuit to break when press-molding printed circuit boards. Since dirt usually comes from lubricating oil, it contains iron that has been mixed in due to machine wear during lubrication, and was disliked due to the fear of short circuits. In the case of glass cloth, when it is manufactured using a high-strength type weft loom, the tube is wound with a unifil (automatic tube winding machine) attached to the loom and the striped yarn is automatically supplied to the loom, but the weft bobbin is The feeding was done by hand and not with a tail end thread.

This is because in the case of glass yarn, the knot strength is extremely low, so it is impossible to tie glass yarn together, and glass yarns are usually joined using adhesive. However, the seam of the glass yarn is bulky because two threads overlap, resulting in a bulky defect and damaging the copper foil during press molding. Moreover, glass yarn is usually less than 4 kg/bobbin and is woven for about 30 meters in a width of 1, so when tail end yarn is used, 3 seams of glass yarn are woven per 100 yarns. This results in a glass cloth with three bulky defects per 100 winds, and the seam alone disqualifies it as a glass cloth for printed circuit boards.
For this reason, even though the air jet loom is used as a high-speed innovative loom, the striped yarn is supplied manually by replacing the bobbin, setting it again from the beginning, and starting again. The current situation is that air jets are operated in a manner that hinders the high productivity of air jets, as they run over and even stop. In this regard, since compound weave is used in the field of clothing, emphasis is placed on the appearance of the woven fabric of the product, and small yarn seams (knots) are almost invisible and are not a problem at all. By continuously supplying weft yarn, high productivity is achieved through high-speed operation, and efficient weft replenishment is achieved, resulting in sufficient labor savings. On the other hand, the length of glass yarn is short, and the amount of silk thread used is 7 to 1 bobbins, which is more than compound weaving, and the air jet loom has a high production capacity that is more than twice as high as that of automatic looms. Due to the nature of the weaving process, it requires a lot of manpower, and because the joints of twill threads cannot be woven, the replenishment of weft threads is interrupted and the machine stops, resulting in a low operating rate, which is a particular problem in the production of glass cloth for printed boards. Therefore, an object of the present invention is to eliminate weft joints in order to automate weft switching, and is characterized by eliminating twill joints while the loom is stopped. The present invention will be explained in detail below.

The yarn bobbins 1 and 2 as striped yarns are set on the bobbin stands 3 and 4 shown in FIG. are connected.

After passing through the yarn guides 5 and 6, the yarn coming out of the currently used raw yarn bobbin is sandwiched between a side length roller 7 and a pressure roller 9 shown in FIG. 2 and lengthened. wolf.
The lengthened thread is temporarily stored in a storage drum 8. This may be done using a pool pipe method. At this time, clamper 11
is closed, then the clamper is opened, and at the same time air is injected from the nozzle 12 to blow the yarn and weave the fabric. When the yarn from the raw yarn bobbin 1 runs out, the yarn from the raw yarn bobbin 2 is used at the weft seam 13, but before the seam 13 is woven into the fabric, a certain amount of the remaining yarn from the raw yarn bobbin 1 is used. or detect it at
Movement or passage of the seam 13 is detected and the loom is stopped before the seam 13 is woven. When the loom is stopped or after that, the warp yarns 20 and 20' are opened by the heddles 19 and 19' as shown in FIG. 3 by inching, and the air guide 18 is positioned between the closed warp yarns. The sub nozzle 21 faces the air guide 18. Similarly, in the case of an air jet loom with only a main nozzle and no sub-nozzles, the air guide 22 is positioned in the middle of the closed warp threads as shown in FIG. After that, the clamper 11 shown in FIG. 1 is opened, the pressure loft 9 and the side rollers 7 shown in FIG. After removing the seam 13, the operation of the loom is restarted. By stopping the loom in this way, we create time to spare, and by eliminating twill seams using the main nozzle, sub-nozzle, and air guide of the silk thread driving device, we are able to continuously supply twill thread without any defects in terms of quality. By making it possible to manufacture glass cloth in an air jet loom, this method solves the problems of low productivity in terms of operation rate and the labor-intensive method of relying on manual labor for weft supply. The present invention has made it possible to operate the loom and supply striped yarn efficiently and labor-savingly. Furthermore, when switching the weft from the raw yarn bobbin 1 to the raw yarn bobbin 2, the switching of the box yarn must be detected in advance in order to first issue a signal to stop the loom in order to eliminate the seam 13.

A phototube type remaining yarn detector 14 or 15 shown in FIG. 1 issues a signal to stop the loom when the amount of remaining yarn becomes constant. However, in this case, when the raw yarn bobbin 1 is used and the yarn runs out and is detected by the phototube type residual yarn detector 14, a stop signal is sent to the loom start/stop circuit 17 via the residual yarn detection circuit 16 to stop the loom. However, if the phototube type remaining yarn detector 14 continues to send signals forever, the loom cannot be restarted, so after eliminating the seam, the remaining yarn detection circuit 16 is switched to the phototube type remaining yarn detector 15. This remaining yarn detection method is used to change the original yarn bobbins in sequence even when there are two or more yarn bobbins. By employing the above-mentioned residual yarn detection system, the silk yarn joints of the present invention can be eliminated and the loom can be restarted stably and reliably. If the sub-nozzle gets caught in the middle of eliminating weft seams, it will not go well, and if you restart the process, there is a risk of a serious accident such as cutting the weft thread.

As shown in FIG. 5, the yarn injected from the main nozzle 12 passes through the air guide 18 and is accelerated by the plurality of sub nozzles 21, and then is sucked by the suction pipe 22, and the warp yarn that is slightly caught is forcibly moved to the suction blower 23. Since the thread is suctioned by the thread, there are almost no problems such as errors in removing seams of striped threads. In addition to the problem of weft seams occurring in the automatic feeding of weft yarns in the present invention, the part where the yarn is first wound around the bobbin when spinning raw yarn is untwisted for a certain length, resulting in a regular yarn. Since the winding is done manually, there is a high probability that it will cause problems statistically, such as dirt from your hands, dirt on the surface of the bobbin, or fluff from scratches on the bobbin. It was expensive.

If possible, it is preferable to manufacture glass cloth using yarn from such a portion. The present invention can be said to be even more preferable in terms of quality because it is possible to remove such problematic threads from the winding portion at the same time as the seams. In this way, the present invention makes it possible to save labor in supplying the entire thread bobbin, and also eliminates threads in areas that are likely to be defective in terms of quality, so that high-quality glass cloth such as that used for printed circuit boards can be manufactured. Weaving can now be carried out continuously and with less labor.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, and is an overall schematic diagram showing the flow of striped yarn from the bobbin stand to the main nozzle, Fig. 2 is a side view of the striped yarn storage device, and Fig. 3 is a side view of the striped yarn storage device. A side view showing an embodiment of the present invention and showing the positional relationship between the warp threads and the air guide, FIG. 4 is a side view of an embodiment using the loom shown in FIG. 3 and another type of loom, and FIG. FIG. 3 is a plan view of FIG. 3 viewed from above. 1, 2...Glass yarn, 3, 4...Bobbin stand,
5, 6... Yarn guide, 7... Kukuyamacho Lofu, 8.
... Storage drum, 9 ... Pressure loaf, 10 ... Yarn guide, 11 ... Clamper,
12... Main nozzle, 13... Seam, 14, 15...
...Phototube type remaining thread detector, 16...Remaining thread detection circuit, 17...Start/stop circuit, 18...Air guide, 19, 19'...Heddle length, 20 , 20'...Long thread, 21...Sap nozzle, 22...Suction nozzle, 23...
...suction blower. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. When continuously supplying weft yarn using the tail end glass fiber yarn, the loom is stopped before the weft seam is used, the clumber is opened, the heald is opened, and the air guide is opened. A glass cloth manufacturing method that does not incorporate weft seams, characterized in that the loom is started after the weft seams are removed by jetting air from a nozzle.