JPS60209052A - Production of glass fiber fabric reduced in nap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing glass fiber fabric with less fluff using an air jet loom.

In an air jet loom, the length of one weft thread is measured by a length measuring drum, stored in a storage tube, and first driven into a warp shed by jet air from an air jet nozzle. The driven weft threads are drawn to the front by a reed to form a woven fabric. At this time, the weft threads are held by a clamp behind the nozzle, and the clamp is usually fixed to the frame of the loom, so the weft threads are drawn against the reed. When being pulled towards Orimae by.

The length of the weft thread between the clamp and the shed is long.

This increase in length is absorbed by elongation of the weft itself and pulling back of the weft in the shed, but a large tension is applied to the weft itself. Fibers with extremely low elongation, such as glass fibers, can be subject to extremely high tensions and may break, so the weft threads slip slightly within the clamp when tension is generated, creating a ramp structure.

However, recently, it has been found that when a glass fiber fabric manufactured by an air jet loom having such a structure is used as a base material for a printed wiring board, for example, minute protruding scratches occur, which poses a problem. Particularly in recent years, with the miniaturization and ultrathinness of printed wiring boards, the above-mentioned minute defects have increasingly become a problem.

As a result of intensive investigation into the causes of the above-mentioned minute flaws, the present inventor found that many fluffs were generated near the end of the fabric on the opposite side from the weft driving side, and these fluffs eventually formed on the printed board. The cause of this fuzz is that when the weft is gripped by a clamp in an air jet loom, or when the weft slips inside the clamp, this weft (hereinafter referred to as "weft") is

It has been found that this is because flaws occur on the surface of the glass fiber at the gripping portion, and these flaws usually appear as fuzz on the woven fabric.

To prevent flaws caused by clamps, it is possible to place the clamp and air jet nozzle on a sink so that they reciprocate together with the reed, but this method increases the weight of the entire sink and makes it difficult to weave. The speed cannot be increased, which is not desirable. Also, increase the amount of weft thread per stroke.

It is also possible to make the part held by the clamp pass through the warp shed and be outside the woven fabric, but with this method, the selvedge (the part of the weft that is inserted into the shed and which is outside of the warp) can be considered. The length of the weft yarn forming the free end becomes too long,
There are problems in terms of weft yield and the accuracy of weft insertion, and it cannot be said to be a preferable method.

The present invention aims to solve such problems, and is intended to provide an air jet loom of a type in which an air jet nozzle and a clamp are fixedly installed on the frame of the loom.
It is an object of the present invention to solve the above problems and provide a method for producing a glass fiber fabric with less fluff.

That is, 5 the present invention provides an air jet loom in which a nozzle for inserting a weft thread and a clamp for gripping the weft thread from the insertion of the weft thread until the insertion of the next weft thread are fixed to a frame, and the clamp is reciprocated with the nozzle. the nozzle and the clamp are arranged close to the warp threads, and the gripping portion of the weft threads by the clamps is arranged near the warp threads at the outermost end intersecting the weft threads. The present invention provides a method for manufacturing glass fiber fabric using an air jet loom, which is characterized by the following.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below as shown in the drawings. In Figures 1 and 2, 1 is a weft yarn feeding bobbin, 2
is a measuring drum, 3 is a storage tube, 4 is an air jet nozzle, 5 is a clamp, 6 is a reed, 7 is a sink, 8 is a weft guide,
9 is a warp, 10 is a fabric part, and 11 is a weft. The air jet nozzle 4 and the clamp 5 are fixedly provided on a loom frame (not shown) separately from the sink 7.

In the present invention, the clamp 5 is disposed between the nozzle 4 and the warp threads 9, unlike the conventional method, and the nozzle 4 and the clamp 5 are disposed close to the warp threads 9. The distance l between the clamp 5 and the warp threads 9 will be described later.

The clamp 5 supports the support base 13. Elastic sheets (e.g.

Urethane sheet)14. Presser washer 15. Drive pin 1
6, the drive pin 16 being actuated by a cam 17 which is rotated by the drive shaft of the loom. The contact surface of the clamp 5 with respect to the weft is used to move the weft 11 inserted into the warp 9 into the weft 1 by the reed 6.
When the weft yarn 11 is moved to the position indicated by the broken line 11A so as to be pressed against the clamp 5, it is long enough to prevent it from coming off the clamp 5.Instead of making the contact surface of the clamp 5 longer, As shown in the figure, a guide plate 1-18 may be provided on the side of the support base 13 to prevent the weft from coming off.In this case, the guide plate 18 does not interfere with the jet air from the nozzle 4. Needless to say, the width of the clamp 5 should be as small as possible to apply the necessary ramp force to the weft yarn.

Cutters 20.21 are arranged on both sides of the textile section 10. The cutter 20 cuts the weft yarn 11A just before it is pressed against the woven fabric 10A, and the cutter 21 cuts the selvage 11B of the woven fabric part 10 formed by the driven weft into a predetermined length of selvage.

Next, the weaving operation will be explained.

The weft from the +11 yarn feeding bobbin l is measured by the length measuring drum 2 and stored in the storage tube 3.

(2) The holding of the weft by the clamp 5 is released.

(31) Simultaneously with the operation of 21, the weft is driven into the shed of the warp 9 by jet air from the nozzle 4.

(4) The clamp 5 holds the weft so that the measured length of the weft is driven.

(5) The inserted weft yarn 11 is drawn to the fabric front 10A by the reed 6 as shown by the broken line 11A. At this time, the length of the weft thread portion hanging between the clamp 5 and the left end of the warp thread 9 increases from 1 to L. Therefore, a part of the inserted weft thread is pulled back from within the warp thread, and the clamped weft thread is pulled out by sliding on the clamp 5, thereby preventing generation of excessive tension.

(6) The cutter 20 cuts the weft yarn 11A.

+71 (Return to operation 11. During this time, as the fabric portion 10 moves forward, the selvedge 11B is cut to a desired length.

In repeating the above-described weaving operation, the length of the weft threads driven in by the second weaving and the distance between the clamp 5 and the warp threads are extremely important. In the present invention, settings are made as follows. That is, in FIG. 5, the selvedge 11 formed by the weft threads that are driven into the shed of the warp threads and drawn to the fabric front by the reed 6
Length C of B (the selvedge 1 extends beyond the warp 9A at the outermost end)
The length of the weft thread portion forming 1B is selected to be about 120 millimeter or less, preferably about 709 (In).With this length, good weft thread driving is possible without impairing the weft thread driving accuracy. , and the weft yield does not deteriorate too much.

At the same time, the portion of the weft that is gripped by the clamp 5 and the portion that is likely to slip within the clamp and cause scratches, that is, the gripping portion 11D, is in contact with or close to the outermost warp 9A (these positions (collectively referred to as nearby positions).

The nearby position is the warp 9A at the outermost end where it intersects with the weft.
, preferably between a distance of 10 dragons in the direction of the weft in the direction of the fabric and a distance of 50 dragons in the direction of the outside of the fabric. Here, the gripping portion 110 of the weft is arranged outside the position of the lO crane in the direction from the warp 9A into the fabric.

This is because the fabric in this area is usually cut and removed before it becomes the final product, so even if there is a flaw in this position, it will not be a problem. On the other hand, the reason why the selvedge 11B is set inward from the 50-tsuru position in the direction outside the fabric is that the length of the selvedge 11B becomes too long outside this point, causing trouble in weft thread insertion. In this way, the weft grip portion 11D can be placed near the warp 9A at the outermost end without increasing the length of the selvedge 11B because the clamp 5 is placed close to the warp 9. be.

As described above, the present invention provides an air jet loom of a type in which an air jet nozzle and a clamp are fixed to a loom frame, in which the clamp is disposed between the air jet nozzle and the deposited metal and close to the warp, and the weft is clamped. Since this is a weaving method in which the gripping part is placed near the warp at the outermost end, it is possible to unnecessarily lengthen the length of weft threads in one run, impairing the weft precision and worsening the weft yield. It has an excellent effect in that it is possible to obtain a glass fiber fabric (without defects due to defects caused by weft clamping) in the effective fabric without any damage, and the obtained glass fiber fabric has a Since it has an extremely low sl content, it is very effective as a base material for ultra-compact or ultra-thin printed wiring boards.

Embodiment 1 In FIG. 2, the width G of the clamp 5 is made to be 15 cm. The distance between the right side and the left side of the clamp is 2
s1). In this loom, the moving distance of the weft yarn in the weaving direction during reed beating is approximately 79 m, the slip length of the weft yarn with respect to the clamp 5 is 12-zen, and the gripping portion LID of the weft yarn by the clamp (length is 15 mm clamp width + slip Weaving was carried out so that the length 12+u=27 mm) was arranged between 27 cranes in the right direction from the warp 9A at the outermost end.

At this time, the length number of the selvedge waste 11B (see FIG. 5) before cutting was 00, and the weft insertion accuracy and weft yield were good. When the fuzz of the woven glass fabric was measured, it was found that the fuzz was extremely small and uniform over the entire width. For comparison, when we measured the fluff of a fabric woven using the conventional method, we divided the fabric into four equal parts in the width direction and found that the third zone from the nozzle side had a lot of fluff, about three times as much as the other zones. there were. Thus, it was confirmed that the present invention is effective in preventing the occurrence of fluff caused by clamps.

Example 2 The width of the clamp 5 was set to 15++ m, the distance between the clamp and the warp was set to 25 mm, and the length of the weft thread lever knob relative to the clamp during reed beating was approximately 14 mm. The length of the selvedge 11B at this time was 83 weight. Also, under the same conditions, the left end of the weft gripping portion LID (Fig. 5) was located within the fabric from the right end of the fabric. When placed so that it is at the position of lQm,
The length of the ear scrap 11B was 731 mm. (b) Even in the case of misalignment, it was possible to obtain a glass fiber fabric with less fuzz.

[Brief explanation of drawings]

Fig. 1 is a perspective view schematically showing the main parts of a loom used for carrying out the method of the present invention, Fig. 2 is an open plan view, and Figs. 3 and 4 are an exploded perspective view and a plan view of a modified example of the clamp, respectively. Figure, 5th
The figure is an enlarged plan view of a part of the fabric section. l- Yarn feeding bobbin 2... Length measuring drum 3- Storage tube 4... Air jet nozzle 5- Clamp 6-- Reed 7- Reed stand 9-- Warp 9A- Outermost warp lO ...-Textile section 10 A-Weaving 11...Weft 11A--Weft 1iB-Selvedge 11D--Gripping part 20.21--Cutter agent Patent attorney Kyo Matsu Sanga 3 Figure 5

Claims (1)

[Claims] In an air jet loom in which a nozzle for inserting a +11 weft and a clamp for gripping the weft from the insertion of the weft until the insertion of the next weft are fixed to a frame, the clamp is reciprocated with the nozzle. Place it between the moving parts. and the nozzle and the clamp are arranged close to the warp threads, and the gripping portion of the weft threads by the clamps is arranged near the outermost end of the warp threads intersecting the weft threads. Method for manufacturing fiber fabrics. (2) The clamped portion of the weft is moved from the outermost warp intersecting the weft at a distance of 10 f in the direction of the weft into the fabric and 50 f in the direction outside the fabric.
The method for manufacturing a glass fiber fabric according to claim 1, characterized in that the glass fiber fabric is arranged at a distance of i.