JPH0355572B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of producing twisted yarns having different twisting directions and twisting torque using a fluid jet jet loom. The purpose is to use a two-nozzle type jet loom with a drum-type weft storage method, and two yarns with different twist directions.
To provide a method for weaving yarns using yarns of a certain size or more as weft yarns, without causing problems in both fabric quality and loom operability even with yarns having high twist torque. Water jet room (hereinafter referred to as WJL)
Until now, fluid jet looms such as the Air Jet Loom (hereinafter referred to as AJL) were sufficient to rationalize the cost of standard textiles, but in recent years, they have been made into commercial machines and have been required to have high added value in order to increase their value. It has also become necessary to respond to value textiles. As a result, in addition to the conventional one-nozzle system,
There has been a demand for the development of a two-nozzle system that is capable of mixing and weft insertion of different materials. In particular, since there have been no rationalized looms that can be applied to two-ply weft-twisted fabrics and two-ply warp-twisted fabrics such as deshin, palis, and jersey, the two-nozzle method has been adopted.
The application of JL is increasingly being considered. However, in general, jet mechanisms have a mechanical disadvantage in that they cannot control the weft yarns during weaving as much as they do with conventional shuttle looms because they jet the weft yarns out of the main nozzle. As a result, when yarns with torque such as twisted yarns are used as weft yarns, unlike flat yarns or textured yarns, the weft yarns often do not reach the opposite side of the fabric nozzle or do not reach the opposite side of the fabric nozzle with the fluid jet pressure alone. However, this caused the problem that the fabric was often folded and woven into the fabric as a knot defect. Conventionally, in order to solve these problems, methods have been used to increase the jetting pressure of fluid such as water or air to increase the weft conveying force, or to strengthen the twist setting conditions of the yarn used for the weft. Attempts have been made to reduce the tension in the yarn inside, but in the former case this leads to an increase in the cost of injection energy, and at the same time, if the injection pressure is increased too much, excessive tension is applied to the weft yarn, which can actually cause the yarn to become tangled. It became easier to follow,
This leads to weaving troubles, and in the latter case, the weaving troubles are certainly reduced as the torque is reduced, but the graininess unique to twisted yarn fabrics is reduced, which impairs the commercial value of the product fabric. Problems arose, and in both cases, it was not possible to truly solve the problem. As a result, even when jet looms are applied to rationalize weft-twisted or warp-twisted fabrics, sufficient effects cannot be obtained in terms of weaving efficiency and fabric quality, and the reason why the jet loom has not yet been able to demonstrate its performance is that This has become a reality. The present invention aims to provide a weaving method that solves these problems. In other words, the present invention was achieved as a result of elucidating various flying problems of torqued yarns twisted in a two-nozzle jet loom and investigating the mechanism of their occurrence. The present invention was completed based on the discovery that the above-mentioned problems can be solved by winding the yarn so that it is unwound in the direction in which the yarn is twisted. Hereinafter, the progress leading to the present invention will be explained in detail. First of all, the mechanism of occurrence of the flying trouble of twisted yarn, which has been investigated by the present inventors, will be described. In general, flying problems with twisted yarns in JL tend to be caused by the generation of snarls in the flying weft yarns due to twisting torque. That is, if the degree of snarl is significant, the weft threads may not be completely elongated and may be woven into the fabric, resulting in defects in the fabric, or may not reach the fabric width direction and may be attached to the loom stop. According to conventional knowledge, this snarl was thought to occur during the flight of the weft yarn. That is, it was thought that when the weft yarn is jetted from the main nozzle, the twisting torque of the yarn cannot be suppressed by the stretching force alone due to the viscous resistance of the jetted fluid, which is why the twisting torque is generated. However, the inventors investigated the process in detail and found that the snarl was not formed while the weft was flying, but was already formed before it was ejected from the main nozzle, and that the twisting direction used for the weft was different. 2 different
It has become clear that the problem does not occur to the same extent in the threads of a book, but that it always occurs more in one thread. Based on this knowledge, we conducted further studies and found that the occurrence of snarls has a strong correlation with the winding direction of the yarn in the weft storage drum of the jet loom. In other words, it has been found that when a twisted yarn with torque is unwound from a drum, if the yarn is untwisted in the direction of untwisting, it is very likely to become loose and cause snarls. In a conventional two-nozzle jet loom with a drum-type weft storage system, the yarns are wound in the same direction on the two drums, so when yarns with different twist directions, S twist and Z twist, are used, It was discovered that many snarls occurred in one of the yarns, which caused poor weft flight. The present invention was made as a result of investigating the mechanism that causes the problems in conventional weaving as described above. In the method of manufacturing textiles using a jet loom that stores the length and inserts the weft by jetting fluid, the twisted yarn with torque is gripped at both ends at two points 10 cm apart, and a 0.01 g/denier weight is rotated in the center. When hanging freely and hanging down to a height of 35cm, the length l of the ripple at the bottom end is 0.5cm or more, and when looking at the winding direction of the twisted yarn around each drum from the main nozzle side, the twisted yarn is the same as the S-twisted yarn. If so, turn right,
In the case of Z-twisted yarn, there is a method for producing a woven fabric using a jet loom, which is characterized in that the yarn is rotated counterclockwise. That is, the twisted yarn with torque used in the present invention is a yarn with a high twist torque and a chamfer length l of 0.5 cm or more, and is measured using a measuring device as shown in FIG.
The gripping distance between both ends A and B of the weft is 10 cm, and a weight of 0.01 g/
When a denier weight M is suspended so that it can rotate freely, it refers to a thread that has a chamfer length l of 0.5 cm or more. Normally, in the case of yarns that are not heat set after twisting, this applies to yarns with a twist of 500T/M or more, and even if the yarns are set after twisting,
If the above values are met, this also applies. Furthermore, the same thing can be said even in the case of plied and twisted yarns. Here, combinations of twisted yarns with different twisting directions include S1500T/M, Z1500T/M, S60T/M, and Z1800T/M. In the present invention, the jet room for weft insertion using fluid jet refers to, for example, a water jet room for water jet or an air jet room for air jet. The method according to the present invention is particularly effective when applied to an air jet room where the weft carrying force of the jetted fluid is weak. As a result, even when the two-nozzle jet loom is applied to weft-twisted yarns and two-ply woven fabrics, the weft flying problem unlike in the past does not occur, and extremely good fabric quality and weaving efficiency can be obtained. It became possible to fully demonstrate the inherent performance of the jet room. Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the accompanying drawings. Figure 1 shows a model of a typical two-nozzle AJL mechanism. On the side of the main body, 1a and 1b are weft threads, a and b are cheeses, 2a, 2b, 3a and 3b are thread guides, and 4
a, 4b are feed rolls, 5a, 5b are length measuring rolls, 6a, 6b are weft storage drums, 7a, 7b
is a drum balloon guide, 8a, 8b are grippers, 9a, 9b are gripper opening/closing cams, 10a,
10b is a main nozzle, and 11a and 11b are pressure pipes, each of which is attached. Cheese a will be explained. The weft yarn 1a is unwound from the cheese a by a feed roll 4a rotating at a constant speed and wound around the storage drum 6a.
At that time, the required length is measured using the length measuring roll 5a. The gripper 8a is opened and closed by a cam 9a that is linked to the rotation of the loom, and grips and releases the weft yarn.
The measured weft yarn 1a is wound around the storage drum 6a only while the gripper 8a is closed.
The main nozzle 10a has a thread guide hole inside, and pressurized air is supplied through a pressurized air pipe 11a. Then, pressurized air is injected only while the gripper 8a is open, and the measured weft yarn 1a is caused to fly into the warp opening of the loom main body 12 and inserted into the weft. Regarding the cheese b, the weft yarn 1b whose length has been measured in the same manner is inserted into the warp opening from the main nozzle 10b. Since the model loom is a two-nozzle system,
When changing the weft by one weft, the two main nozzles alternately spray the weft for each rotation of the loom. In addition, when changing two weft threads, the two main nozzles alternately eject and insert the weft every two rotations of the loom. In either case, while one main nozzle is injecting, the other main nozzle is at rest, and during that time the weft yarn is stored in the storage drum. Here, as twisted yarns with different twist directions, S twist
Let us take as an example the case of weaving a 1-koshi deshin fabric using 1500T/M and Z-twisted 1500T/M yarns. In the figure,
S twist 1500T/M for cheese a, Z twist for cheese b
1500T/M shall be installed, main nozzle 10a
After 1500 T/M of S twist is injected from the main nozzle 10b and beaten, 1500 T/M of Z twist is injected from the main nozzle 10b and beaten. This is repeated alternately. Here, the S-twisted yarn and the Z-twisted yarn are stored in the weft storage drums 6a and 6b.
Wrapping in the direction of twisting is done as follows. For S-twisted yarn, the drum 6a is on the balloon guide 7a side, that is, the main nozzle 1
Wrap it so that it rotates clockwise as shown in Figure 2b when viewed from the 0a side. Regarding the Z-twisted yarn, when the drum 6b is viewed from the balloon guide 7b side, it is
Wrap it so that it rotates counterclockwise as shown. If the winding is performed as described above, each yarn will be unwound in the twisting direction when it is unwound from the drum, and snarls due to yarn twisting will not occur.
Stable weft flight can be obtained during weaving. Example When weaving a cubladessine fabric with the following textile design using a two-nozzle type air jet loom that stores two types of weft yarns by winding them around each drum, weft yarns of 50 denier, 30 filaments, and reeds of 90 wefts are used. /Whale size drawing...2 pieces/feather Weft 75 denier 45 filament (Pushing 130 pieces/whale size) S...3000T/M Z...3000T/Weft threads are driven through each M2 as shown in Figure 1 as an example. When looking at the drum from the side of the main nozzle that unwinds the yarn, change the winding direction to the right for S twist, and for Z twist.
In the case of twisting, a weaving method characterized by left-handed winding is applied, and as a comparative example, a weaving method characterized by left-handed winding for both S-twisted yarn and Z-twisted yarn is applied. Shown in the table below.

[Table] Thus, it can be seen that the examples are extremely effective in reducing the number of loom stoppages and improving the fabric quality.

[Brief explanation of drawings]

Figure 1 is a side model diagram of the jet loom showing the mechanism of the jet loom for wefting two types of twisted yarns with different twist directions, and Figures 2 a and b show the winding directions of Z-twisted yarn and S-twisted yarn and the storage drum, respectively. The model diagrams and FIGS. 3a and 3b are drawings showing a method for measuring the torque of twisted yarns. 1a, 1b...weft, a, b...cheese, 2a, 2
b, 3a, 3b... Thread path guide, 4a, 4b... Feed roll, 5a, 5b... Length measuring roll, 6a, 6
b...Weft storage drum, 7a, 7b...Drum balloon guide, 8a, 8b...Gripper, 9a, 9b
... Gripper opening/closing cam, 10a, 10b... Main nozzle, 11a, 11b... Pressure pipe, 12... Loom body, M... Weight, l... Length with chamfer.

Claims (1)

[Claims] 1. In a method of manufacturing textiles using a jet loom, in which twisted yarns having a plurality of torques in different twisting directions are wound around separate drums, their lengths are stored, and weft is inserted by fluid injection, the twisted yarns having torques are 10 cm long. Grip both ends at two separate points,
A 0.01g/denier weight is hung in the center and can rotate freely.
When hanging to a height of 35cm, the length l of the bottom edge is
A jet loom having a length of 0.5 cm or more, and characterized in that the winding direction of the twisted yarn around each drum is clockwise rotation when the twisted yarn is S-twisted yarn, and counterclockwise rotation when the twisted yarn is Z-twisted yarn, when viewed from the main nozzle side. A method for manufacturing textiles.