JPH02169744A - Weaving of monofilament fabric by water-jet loom - Google Patents

Abstract

PURPOSE:To perform stable weaving of the subject fabric with a waterjet loom by carrying out the weft-insertion flying under a specific weft-insertion condition using a flying-type water jet loom having restrained flying stage. CONSTITUTION:The weaving of the subject fabric with a flying-type waterjet loom having restrained flying stage is carried out in a state to satisfy the formula 10 deg. <=theta-theta3<=50 deg. wherein theta3 is crank angle of the loom at the start of restrained flying and theta4 is crank angle of the loom at the end of weft insertion. A monofilament having a fineness of<=30 denier is used as the weft.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of weaving monofilament fabric using a water jet loom. More specifically, the present invention relates to a water jet loom weaving method that can stably obtain a good fabric when a monofilament yarn of 30 denier or less is used as the weft.

(Prior Art) Conventionally, woven fabrics using monofilament yarns of 30 denier or less as wefts (hereinafter referred to as monofilament woven fabrics) are
Due to the difficulty of inserting the weft threads, high-productivity jet looms are not used for production, and instead are used on shirttle looms, rapier looms,
It is produced using a gripper loom or the like at a low rotation speed of 20 Orpm or less, and there is a problem in that the weaving cost is high due to low cost productivity. In addition, the quality of the woven fabric deteriorates significantly with the shirttle loom due to defects in the weaving steps when replacing the shirttle, while the rapier loom cannot weave high-density fabrics of 250 threads/inch or more, and the gripper loom, which can weave even high-density fabrics, There are problems such as the high price of looms and the limited number of machines currently in stock.

Therefore, in order to reduce the manufacturing cost of monofilament woven fabrics and to solve the individual problems of conventional looms, there is a need to develop jet looms with higher productivity.

(Problems to be Solved by the Invention) An object of the present invention is to provide a method for weaving a monofilament fabric using a water jet loom, which could only be woven using a shuttle loom, a rapier loom, or a gripper loom. It is an object of the present invention to provide a weaving method that can reduce the weaving cost of monofilament woven fabrics and stably obtain high-quality woven fabrics.

(Means for Solving the Problems) The gist of achieving the objects of the present invention is as follows.

When weaving a monofilament of 30 denier or less as a weft using a water jet loom that takes a flying form with a restrained flight, the loom crank angle at the start of the restrained flight (θ3) and the loom crank angle at the end of the weft insertion (θ4) are ,
A method for weaving monofilament fabric using a water jet loom characterized by satisfying the following formula 10''≦θ4-θ3≦50a The present invention provides the above-mentioned optimal The weft insertion conditions were discovered, and it was completed based on this knowledge.

There are two types of weft flying force formulas for water jet looms: ■The so-called free-flying method, in which the length of the weft yarn stored for one weft insertion is inserted all at once by a jet stream, and the weft yarn is made to fly through the weft opening. ■When the weft is inserted, the weft stored for a predetermined length (a portion of the length of one weft insertion) is allowed to fly freely through the warp shedding by a jet flow, and then the weft is restrained while being measured. to cause, so-called,
A combination method of free flight and restrained flight.

Hereinafter, the above-mentioned combination method of free flight and restricted flight will be referred to as a flight format with restricted flight.

Normally, when the weft is inserted in a water jet loom that uses a flying type with restrained flying, the weft thread is wound around a storage drum for a predetermined length, and as the weft thread gripper opens,
The jet flow allows the warp threads to fly freely through the warp opening until the threads wound around the storage drum run out.Then, the weft threads that are insufficient for one weft insertion are flown in a restrained manner while being measured, and when the weft thread gripper closes, the weft threads are inserted. will be terminated.

The restricted flight start loom crank angle θ3 in the present invention is the timing at which the weft finishes free flight and starts restricted flight. The weft insertion end loom crank angle θ4 is the timing at which the weft gripper closes. The weaving machine crank angle is an angle that is expressed by dividing one rotation of the loom into 360 degrees, and defines Oo when the reed in the loom is at the frontmost (front side) position. FIG. 1 is an explanatory diagram showing the weft inserting crank angle of the loom, where θ1 is 4.0 at the start of injection. tli machine crank angle, θ2 is the weft flying start y & loom crank angle θ, is the weft flying start loom crank angle, e4 is the weft insertion end loom crank angle, and S (shaded area) is the period of the gripper-closing loom crank angle. show.

In the present invention, if the value of θ4--〇 is smaller than 10°, the weft cannot sufficiently reach the weft end on the anti-nozzle side, resulting in insufficient weft output, resulting in frequent loom stoppages and stable weaving. cannot be obtained.

In addition, if the value of θ4-83 is larger than 50°, the tip of the weft yarn in flight may be shaken, the tip of the weft yarn may be caught in the warp yarn during weft flight, or the weft tip may be bent, or the weft may be unsteady from the start of restricted flight of the weft yarn. Because the time until the end of weft insertion is too long, the weft tip is not stable after the weft has finished flying, and the loom often stops due to phenomena such as catching errors in which the weft is not caught by the yarn end processing system even though the weft is long enough. Stable weavability cannot be obtained. That is, in order to stably obtain a good woven fabric, it is necessary to insert the weft under conditions that satisfy the following relationship: 106≦84−θ3≦50″.

Note that the weaving method according to the present invention can be achieved, for example, by adjusting the pressure of the pump that injects the jet stream.

In the present invention, the monofilament includes synthetic fibers such as polyester and polyamide. Its fineness is 7
A denier (d) of up to 30 denier (d) is preferable; if the denier is 30 d or more, the monofilament becomes stiff and the weft flight properties deteriorate, making it impossible to obtain stable loom operability. Furthermore, if the monofilament is less than 7 d, the strength of the monofilament is weak, and tearing of the edges occurs during fiber production, making it difficult to weave.

(Example) Hereinafter, an example of the weaving method according to the present invention will be described. However, the present invention is not limited to this example.

Example Using a polyester monofilament of 30 denier for the warp and a polyester monofilament of 30 denier for the weft, taffeta with a warp density of 196/2.54G and a weft density of 196/2.54 cm was fabricated on a loom at 4 rotations.
Weaving was carried out using a water jet loom at 0 rpm under the following weft insertion conditions.

Weaving start loom crank angle (θt) 105' Weft flying start loom crank angle (θ,) 115° Weft insertion end loom crank angle (θ4) 240° Under the above conditions, the pump pressure was adjusted as shown in Table 1. By doing so, the loom crank angle (θ3) at which the restricted flying starts was changed, and the number of loom stops corresponding to each condition was investigated. The results obtained are shown in Table 2. As is clear from Table 2, when θ4-θ3 is within the range of 10° to 50°, the number of times the loom is stopped can be significantly reduced compared to outside the range.

Table 1 Table 2 (Effects of the Invention) Since the weaving method according to the present invention is configured as described above, weaving can be carried out in a water jet loom using a monofilament of 30 deniers or less as the weft under specific weft insertion conditions. Even in this case, stable weaving can be achieved and a reduction in the cost of weaving the monofilament fabric can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the weft insertion crank angle of a loom. Figure 1 Patent applicant Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] When weaving a monofilament of 30 denier or less as a weft using a water jet loom that takes a flying form with a restrained flight, the crank angle of a restrained flight start loom (Θ_3) and the weft insertion end loom. A method for weaving monofilament fabric using a water jet loom, characterized in that the crank angle (Θ_4) satisfies the following formula: 10°≦Θ_4−Θ_3≦50°