JPH02277850A - Weaving by water jet loom - 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 [Industrial Application Field] The present invention relates to a water jet loom weaving method. More specifically, the present invention relates to a water jet loom weaving method that can stably obtain a good fabric when a synthetic monofilament yarn is used as the weft.

[Conventional technology]

Conventionally, as a means of weaving textiles using monofilament synthetic fibers (hereinafter referred to as monofilament textiles), production in a high-productivity water jet loom has been carried out using two weft inserts.
Due to the difficulty for humans, monofilament has only been subjected to processes such as false twisting and combination twisting. Usually, shuttle looms, rapier looms, and gripper looms are used, but these machines are produced at low rotation speeds of 200 rpm or less, and high weaving costs resulting from this low productivity pose a problem. Furthermore, Shirttle looms have the problem of poor quality fabrics due to defects in the weaving steps when replacing Shirttles, while Gribpar looms can weave relatively high density and are superior in terms of fabric quality, but the looms are expensive, and the equipment is currently unavailable. There are also problems such as the limited number of machines.

Therefore, in order to reduce the weaving cost of monofilament fabrics and solve the individual problems with conventional looms, there is an urgent need to develop water jet looms, which have faster loom rotation speed and higher productivity. is the current situation.

[Problem to be solved by the invention]

The difficulty in weaving monofilament using a water jet loom lies in the fact that monofilament is less able to ride water jets than multifilament. That is, weft insertion of monofilament is mainly carried out by covering the tip of the weft with jetted water and inserting it flying, but the tip of the weft is stably included and difficult to fly.

As a result, satisfactory weft insertion could not be obtained, the number of loom stops increased, and fabric defects such as weft knots and stop stages occurred frequently, making it impossible to obtain a good woven fabric.

The present invention aims to provide a method for weaving monofilament fabrics using a water jet loom, which could conventionally only be produced using shirttle looms, rapier looms, and gripper looms, thereby reducing the cost of weaving monofilament fabrics. The purpose of this invention is to stably obtain a good quality fabric.

Two types of conventional water jet loom weft measuring and storage devices are generally used: a pipe type in which the weft is stored in a pipe by air suction or air injection, and a drum type in which the weft is wound and stored in a drum.

The present inventors investigated both methods for the flying properties of synthetic fiber monofilament, and found that in the former vibrator method,
The monofilament had poor length measurement uniformity and poor storage properties, and it was impossible to fly and insert a weft yarn of a certain required length, making it completely unusable.

On the other hand, the drum method, which is the most commonly used method, allows a monofilament of a certain length to fly, but the loom stops due to large so-called "rabbles at the ends of the weft" during the flight. , and stable weavability could not be obtained.

The inventors further investigated the unstable flying performance of this drum method, and found that monofilament has poor riding performance against jet water, and high tension is added during flight. It was found that this is a major factor causing instability in flight performance.

This point will be explained in detail with reference to FIG. Second
The figure shows an example of the change in tension of a weft yarn during flight using a drum-type length measuring and storage device.

The weft starts flying at a crank angle θ, and ends flying at a crank angle θ2. In the case of the drum length measurement/storage method, even after the weft thread has finished flying, the length of the next insertion is measured, rolled up, and stored at - foot rotational speed. The weft length is not wound and stored on the drum, but only a part of the weft length required for one insertion is wound and stored on the drum in advance, and the remaining length is measured by length measurement. It is sent by the pulley and at the same time it is sent flying. In Fig. 2, between crank angles θ and θ3,
This is newly stored before the start of the flight and partly during the flight. Therefore, this part has low unwinding tension, i.e.
This is a state in which the weft threads fly depending on the speed of the jet stream,
This is the so-called free flying area.

On the other hand, the part between the crank angles θ and θ2 corresponds to the length of the above-mentioned shortfall, and is sent by the length-measuring pulley and simultaneously flies. This part is called the so-called restrained flight region, and at the start of restrained flight θ3, a flight tension that is 8 to 20 times higher than the flight tension in the free flight region is suddenly applied. In other words, the weft flight is in a state where a sudden brake is applied, and this is a major factor in giving unstable flight performance to the monofilament, which already has poor water riding performance.

It is necessary to eliminate this restricted flying area and find the appropriate weft insertion timing (as a result of intensive study by the present inventors,
This has led to the present invention.

[Means to solve the problem]

The gist of the present invention is as follows.

When weaving synthetic fiber monofilament as a weft in a water jet loom, the weft is completely free flying, and the loom crank angle θ at the start of weft flight and the loom crank angle θ2 at the end of flight are as follows. A water jet loom weaving method characterized by satisfying the formula.

70"≦08-01≦1358 The synthetic fiber monofilament referred to in the present invention includes polyester and polyamide fibers. If the fiber is 50 denier or more, the monofilament becomes coarse and hard;
It is difficult to obtain stable weft insertion, and the rotation speed is reduced (
Therefore, the contribution to productivity is small. In addition, the completely free flying method means that the weft yarn for one weft insertion is stored in the loom storage section in advance before it starts flying, or that the weft yarn for one weft insertion is stored in the loom storage section before the weft yarn starts flying. Even if all the weft yarns for a batch are not stored, a weft length measuring and storage device is installed on the loom, which has a mechanism to measure and store all the weft threads for one weft insertion before all the stored weft yarns finish flying. Figure 1 shows the transition of the weft flying tension during monofilament weft insertion using this fully free flying force method, which is achieved by using the full free flying force method. The entry will be terminated, but in the meantime,
The weft threads always fly with a constant low tension.

If the value of the above loom crank angle θ2 - θ is smaller than 70'', "weft tip fray" will be large during flying and after flying, and the weft tip will get tangled or the weft will not arrive within a predetermined time. Despite this, the loom often stops, a phenomenon called "idle running," and stable weaving cannot be achieved.

Furthermore, if the value of θ2-01 is larger than 135', the fluctuation of the weft tip during flight is large (the weft tip is frequently stopped due to being caught by the warp, and stable weaving cannot be obtained). The timing of the loom crank angle can be achieved by adjusting the amount of water injected by the jet, for example by adjusting the pump pressure of the pump that injects the jet, or by changing the stroke of the pump plunger. achieved.

It is suitable to weave at a loom rotation speed of 350 to 500 rpm. It doesn't matter if the rotation speed is around 350 rpm or less, the productivity of the fabric will be low, and if the rotation speed is less than 350 rpm,
If the speed is 0 rpm or higher, the flying properties of the weft tend to deteriorate.

〔Example〕

Hereinafter, the weaving method of the present invention will be explained using examples. However, the present invention is not limited to the examples.

Examples 1 to 4 and Comparative Examples 1 to 4 Using 20 denier polyester monofilament for the warp and 20 denier polyester monofilament for the weft, the warp density was 196/2.541, and the weft density was the same <196/2.54 CI. Loom rotation speed 4 for flat weave
Using a water jet loom of 0 rpm, the loom crank angle θ1 when the weft yarn starts to fly is fixed at 105°, and the loom crank angle θ2 when the weft yarn finishes flying is fixed at 105°.
Weaving was performed by adjusting the angle from 165° to 250° using pump pressure, etc.

In addition, two types of weft flying methods were used: a conventional free flying plus restrained flying method and a completely free flying method.

Table 1 shows the results of the number of times the loom stopped weft (times/machine/day). As is clear from Table 1, by adopting the completely free running system and setting θ2-01 within the range of 70° to 135°, the number of stops of the textile machine can be significantly reduced compared to the conventional method. I can do it.

〔Effect of the invention〕

By the weaving method of the present invention, stable weaving of a monofilament fabric can be achieved by eliminating the restricted flying area and by achieving appropriate weft insertion timing.

[Brief explanation of drawings]

FIG. 1 is a graph showing the relationship between the crank angle of a loom and weft tension in a completely free-running type loom according to the present invention. FIG. 2 is a graph showing the relationship between the loom crank angle and the weft tension in the conventional free running plus restricted running system. FIG. 3 is a sketch for explaining the method of measuring weft tension shown in FIGS. 1 and 2. FIG. θ,: Loom crank angle θ2 at the start of weft flight: Loom crank angle θ at the end of weft flight,: Loom crank angle θ4 at the start of restraint flight: Loom crank angle 1 at beating time - weft tension detector , 2-- Weft yarn from the weft storage device, 3-- Weft gripper, 4- Spray nozzle, 5- Guide 1st treatment, 1 corner ('1 Fig. 2

Claims (1)

[Claims] 1. When weaving in a water jet loom using synthetic fiber monofilament as the weft, the weft is completely free flying, and the loom crank angle θ_1 at the start of the weft flight and the loom crank angle θ_1 at the end of the weft flight are A water jet loom weaving method characterized in that the crank angle θ_2 satisfies the following formula. 70°≦θ_2−θ_1≦135°