JPH02127544A - Production of dobby tissue woven fabric - Google Patents

Abstract

PURPOSE:To produce a dobby tissue woven fabric having a good warp quality in good productivity by setting a ratio between the respective tension strains of warps at a vertically opening time and at a stopping opening time at a lower or upper position within a specific range. CONSTITUTION:When a dobby tissue woven fabric is produced, a warp tension strain (a) at a vertically opening time and a warp tension strain (b) at a stopping opening time at a lower or upper position are set within a range satisfying 0.8<=b/a<=1.2 to equalize the respective tension strains and simultaneously reduce the differences of the tension strains among the respective warps.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of weaving a dobby texture fabric. More specifically, the present invention relates to a weaving method that reduces the difference in warp tension distortion when weaving a fabric other than a plain weave, enables stable high-speed weaving, and provides a high-quality fabric.

[Conventional technology]

Generally, when the fabric structure is complex and eight or more healds are required during weaving, it is difficult to interlock the warp shedding with the tappet method, and a one-way dove type shedding device is used. Most of the dobby type shedding devices are practically used with up to 16 healds.

However, the 16-heddle force distortion becomes large, leading to the generation of warp fuzz, which eventually leads to warp breakage and deteriorating weaving properties. Therefore, in order to minimize the deterioration in weaving properties due to the effect of tension distortion on the warp due to the shedding movement, methods such as increasing the amount of glue attached to the warp, twisting the warp, or applying glue to the twisted warp are used. It is being On the other hand, the weaving speed of recent innovative looms has been increasing rapidly, and some products are now being woven at speeds of 1,000 rpm or more. Furthermore, the development of materials for clothing is rapid, and so-called differentiated materials are appearing on a daily basis, and the current situation is that weaving technology is required to be more and more sophisticated. Against this background, when weaving dobby textured fabrics using warp yarns with a low elastic recovery rate at high speeds, the amount of glue attached to the conventional warp yarns increases as described above, and the warp yarns are twisted or warp twisted yarns are pasted. 4. Even if the methods to do so alone or in combination,
There are problems in that warp fuzz occurs and warp yarns are cut, reducing weaving properties and producing defective fabrics.

[Problem to be solved by the invention]

The present inventors have conducted extensive research to solve these problems and provide an excellent dobby fabric, and have arrived at the present invention. The present inventors conducted a detailed comparative investigation of warp tension strain behavior during weaving between plain weave and dobby Mi weave (see Figure 3). In FIG. 3, the three curves shown by solid lines are the warp tension strain curves when weaving a representative Mi woven % fill of the dobby weave, and the C curve shown by the broken line is the warp tension strain curve when weaving a plain weave. In the figure, the vertical axis is the amount of strain, the tension strain value increases as the distance from the warp tension strain value at the time of closing shown at 5 increases, and the horizontal axis represents time.

As shown in Fig. 3, in the case of a flat weave, the warp yarns move by repeating upper shedding and lower shedding alternately, so the warp tension strain value at the upper shedding (indicated by 60 in Fig. 3) and the lower shedding The warp tension strain value ((indicated by 70 in Figure 3) at The warp threads of the tissue repeat the shedding motion in the order of upper opening, upper opening, lower opening, lower stop, opening, lower opening, lower opening, upper opening. It has been found that there is a large difference in warp tension strain between the lower opening (as shown in FIG. It is an object of the present invention to provide a weaving method which enables high-speed weaving even with warp yarns having a small elastic recovery rate by reducing the difference, and which makes it possible to obtain a high-quality dobby structure fabric.

[Means to solve the problem]

Therefore, the present inventors solved the drawback of the large difference in warp tension strain between when the warp is opened at the top and bottom and when it is opened at the bottom or the bottom stop, and the inventors of the present invention have solved the problem of the large difference in warp tension strain between when the warp is opened at the top and bottom and when it is opened at the bottom or the bottom. We have discovered a method that enables speed weaving, and have arrived at the present invention. That is, when weaving a dobby structure fabric,
When the top and bottom are open and 0.8≦b/a≦1.2, where a
: Indicates warp tension strain when opening the top and bottom, b: Indicates tension strain when opening the bottom or top stop.

Hereinafter, the structure and operation of the present invention will be explained in detail.

Dobby knit fabrics refer to fabrics other than plain weave structures, such as fill, satin, and other different structures.

-For boat fishing, it represents an organization that uses a dobby attached to a loom. The upper and lower openings refer to the upper and lower openings of the warp threads. Lower or lower stop opening means that in dobby tissue, the tissue always stops in the open state while repeating open, low, close, and low opening.
It represents a state in which it is stopped in its open state. Warp tension strain refers to the strain caused by changes in warp length and displacement caused by weft insertion, etc. when warp yarns perform shedding motion, and is generally expressed as a value measured using a strain sensor.

The effect of the present invention will be explained below using a 2-fill structure, which is a typical Dobby structure.

2 fills! The shedding motion of kI1m, the accompanying shedding, and the movement of the back roller to alleviate the difference in warp tension strain at the time of shedding are as follows: When shedding is as shown in Figure 1 (^), the back roller moves forward and the first Figure (closed as shown in 81 (however, warp 1/3
(opens downward or upward), the bank roller retreats. Then, at the time of the next opening shown in FIG. 1 (C1), the bank roller moves forward again.The back roller constantly repeats the above movement.

In this case, the warp tension strain a indicates the warp tension strain when the warp threads are at their maximum opening at the top or bottom. The warp tension strain b at the time of stopping and opening at the bottom or top is as follows: 273 of the warps are closed, the remaining 1/3 stops with the top or bottom open, and the bank roller works to retreat with 2/3 of the warps. Indicates the tensile strain value due to

In the case of the A fill structure, the warp tension strains a and b repeat the tension strain waveform shown by the solid line B in FIG. 3 every three revolutions of the loom.

Therefore, the inventors of the present invention have developed a method for reducing the warp tension distortion difference between the upper and lower openings and the lower or lower stop openings shown in FIG. 3 by changing the height of the back roller from the normal setting position. We have discovered that this is possible, and have led to the present invention.

The height of the bank roller is generally set on an extension of the height of the woven fabric and the center of the mail of the heald when closed.

Unlike such empirical methods of installing bank rollers, the present invention enables stable high-speed weaving of the desired high-quality fabric by setting the height based on the value of warp tension strain a/b. Therefore, we can provide a possible weaving method. That is,
This is possible by setting the back roller height so that it falls within the range of 0.8≦b/a≦1.2.

Specifically, based on the tension distortion waveform shown in Fig. 3, by setting the back roller setting position at the rear of the loom above or below the general setting position, the warp tension distortion a and It is possible to reduce the difference in warp tension strain b between the lower and lower stop openings.

Due to the principle of weft insertion in a loom, there should not be any slack in the warp threads at the time of shedding, and each warp thread must be able to fully follow the tension strain fluctuations at opening and closing, especially with the recent high This requirement is becoming stronger in speed innovation looms. Naturally, the height of the back roller in the range of 0.8≦b/a≦1.2 varies depending on the warp type, the four types of looms, the length between the weaving front and the back roller, the opening amount, etc. In any case, according to the present invention, as shown in FIG. Both are equalized. That is, the warp tension strain value at the upper opening indicated by 68 in FIG. 2 and the warp tension distortion value at the lower stop opening indicated by 8a are substantially equal. At the same time, the warp tension strain difference with other yarns also decreases. Although the effect of the present invention has been explained using a % fill structure as a representative example, the present inventor is not limited to a 2 fill structure, but can apply to other dobby structures in general.

If the value of b/a is less than 0.8, the warp yarns will loosen during the downward shedding movement due to tension strain on the bank roller during the downward or downward stop shedding, and the shedding will not be orderly and the weft flight will become unstable. . Particularly in water jet looms, air jet looms, etc., which use a fluid-type weft insertion method, the ends of the wefts may break or become stuck, resulting in unstable weaving. On the other hand, b
When the value of /a exceeds 1.2, fuzz is likely to occur in the warp threads, which eventually leads to warp thread breakage, leading to a decrease in loom operability.

Therefore, when weaving Dobby U-woven fabric, 0.8≦b/
If the back roller height is set in the range of a ≦1.2, each warp thread will be placed in the upper and lower closing rows, as can be seen from Figures 1 (^) to 1 (C) and Figure 2. The warp distortion when repeating the lower stop, open row, lower intermediate row, closed row, and upper opening is equalized both on the upper and lower sides. At the same time, the difference in warp tension and strain with other yarns is reduced, and regardless of the warp type, four types of looms, or others, the warp can easily follow the opening-closing movement even during high-speed weaving, stably at high speeds. Weaving is possible and high quality fabrics can be provided.

〔Example〕

Below, several examples of the method for weaving a dobby texture fabric according to the present invention will be shown, as well as several comparative examples.

The warp yarn is made of polyester 75d/36f and the weft yarn is polyester 100d/48f, and the warp density is 126/inch and the weft density is 82/inch.
1 weave in a water jet loom at 600 rpm, 500rd for each condition! woven. At that time, the weaving was performed with a warp strain difference b/a of 1.1 as Experiment N[Ll, and the weaving with b/a as 0.9 was designated as Experiment No. 2. As a result, the experiment as shown in Table 1? For both 1kLL and 2, the number of loom stoppages was small (and the weaving operation rate was high, and in addition, the A turn rate of the woven product was excellent.

Experimental magnet 3 was obtained by comparing the weaving using the same loom with a warp strain difference b/a of 1.5, and experimental magnet 4 was obtained by using the same loom with b/a of 0.6. As a result, as shown in Table 1, the number of times the loom was stopped increased in both experimental runs 3 and 4, the weaving operation rate was low, and in addition, the A reversal rate of the product fabric was also low.

Next item: 5 pieces of 3 skipped satin fabric with a warp density of 126 threads/inch and a weft density of 82 threads/inch, using processed yarns of polyester 75 d/36 f for the warp and polyester 100 d/48 f for the weft, water jet loom 50 Woven by ゜rpsan. Experiment 11kL5 is the one weaved with the warp distortion difference b/a of 1.0, and Experiment 11k is the one in which the position of the back roller is set so that b/a is 1.4.
Weaving experiments were carried out for 500 m each with L6. As a result, as shown in Table 1, in Experiment No. 5, the number of loom stoppages was small, the weaving operation rate was high, and the A reversal rate of the woven product was also excellent. In contrast, in experiment NCL6, the number of loom stops increased, the weaving operation rate was low, and in addition, the A of the product fabric
The reaction rate was also low.

Table ■ [Effects of the Invention] By using the method of weaving the dobby set ¥a fabric according to the present invention, the tension distortion of each warp thread is made uniform, and at the same time, the difference in tension distortion between each warp thread is reduced, and the difference in tension distortion between the warp threads is reduced. There is no warp fuzz or warp breakage, so productivity is high.
It is possible to provide a dobby structure fabric with good quality of the obtained fabric product. In addition, there is no need to use a loom with special specifications, and it can be used regardless of the warp type, loom type, or other type.
Even during high-speed weaving, the warp yarns can easily follow the opening-closing movement, stable high-speed weaving is possible, and high-quality fabrics can be provided.

[Brief explanation of drawings]

Fig. 1(^) to Fig. 1(C) are diagrams showing the movement of the bank roller over time as the warp is shed when weaving a two-fill structure fabric according to the present invention, in which 1 is the warp and 2 1 indicates the bank roller, 3 indicates the warp opening, and 4 indicates the weaving area.
^) shows the position of the warp and back roller when fully opened, Figure 1 (8) shows the positional relationship of the warp and back roller when closed, and Figure 1 tc) shows the position of the warp and back roller when fully opened again. The warp and bank roller positions are shown in the figure. FIG. 2 shows warp tension strain curves of a two-fill structure in the weaving method according to the present invention. 5a indicates the warp tension strain value when the opening is closed, 6a indicates the warp tension distortion value when the top opening is open, 7a indicates the warp tension distortion value when the bottom opening is closed, and 8a indicates the warp tension distortion value when the bottom stop is closed. FIG. 3 shows warp tension strain curves when weaving a conventional plain weave fabric and a typical two-fill fabric. 5
b indicates the warp tension strain value when the opening is closed, 6b and 6c indicate the warp tension distortion value when the top opening is made, 7b and 7c indicate the warp tension distortion value when the bottom opening is made, and 8b indicates the warp tension distortion value when the bottom opening is stopped. Show value.

Claims (1)

[Scope of Claims] A weaving method when weaving a dobby textured fabric, characterized in that the relationship between the warp tension strain at the time of top and bottom opening and at the time of bottom or top stop opening is set within the following range. 0.8≦b/a≦1.2 a: Warp tension distortion when opening top and bottom, b: Warp tension distortion when opening bottom or top stop