JPS5842291B2 - Ryuutaifunshiyakakounoitokakehouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for threading in fluid jet processing, and its purpose is to provide a method for easily, safe and reliable threading during heated fluid jet processing subsequent to heated drawing. It is about providing.

In recent years, in order to improve the efficiency and speed of fluid jet processing, undrawn thermoplastic synthetic fibers have been drawn using heated drawing rollers.
A fluid injection process has been proposed in which the fluid is immediately introduced into a heated fluid injection nozzle (for example, Japanese Patent Publication No. 48-20905, No. 4)
The method of threading in this case is to introduce the thread into a nozzle using a suction tool such as a suction gun, and while suctioning it, wind the thread around the supply roller, the heated drawing roller, etc. one after another. Conceivable.

However, in this method, since the undrawn yarn is not oriented or crystallized and the yarn diameter is large, fusion of the yarn occurs in the nozzle hole or the yarn is stuck between the roller nozzles. The tension decreases due to the contact resistance of the yarn in the nozzle hole, and on the other hand, stretching of the undrawn yarn starts between the supply roller and the heated stretching roller, and the yarn tension is suddenly added, and the interaction between the two causes the stretching roller to The yarn sticks and wraps around the top, making threading virtually impossible.

At this time, particularly in the case of a heated drawing roller having a mirror surface, drawing starts abruptly after just one turn of the undrawn yarn around the roller, and the thread tends to stick to or wrap around the roller.

For this reason, the conventional method for threading is to suction the undrawn yarn using a suction tool, then wind it around a rotating supply roller, heated drawing roller group, etc. in order to start drawing, and then stop the roller group. However, there is a method for threading in which one end of the drawn thread is introduced into a heated fluid jetting nozzle and sucked by a suction tool while the roller group is driven again.

However, such a conventional method requires a driving device such as a motor capable of controlling a group of heated stretching rollers and a stopping force for each device, and is therefore impractical in terms of equipment.

In order to eliminate the drawbacks of these threading methods, for example, the thread is wound in advance up to a heated drawing roller using a suction tool such as a suction gun, and the continuously running thread is then passed through the nozzle thread guide hole using a hook or the like. A method has been proposed for threading the thread (Japanese Unexamined Patent Publication No. 4
No. 8-6047).

However, in this method, the yarn must be transferred using a suction gun or the like, which is complicated and often fails, and the threading process requires a long time, resulting in a large amount of yarn loss, which poses production problems.

The inventors of the present invention did not use the above-mentioned complicated threading method, and after intensively studying methods for threading that is easy, safe, and reliable, the inventors found that threading should be carried out under conditions where the thread tension does not increase rapidly. This discovery led to the present invention.

That is, in the present invention, an undrawn thermoplastic synthetic fiber yarn is stretched by a heated stretching roller in which a part of the circumferential surface of the yarn passage is mirror-finished and at least the exit side circumferential surface of the yarn passage has a satin-finished surface, and then immediately subjected to heating fluid. When introducing the yarn into a jet nozzle and performing fluid jet processing, the undrawn yarn is introduced into the nozzle while the supply of heated fluid to the nozzle is substantially stopped, and the yarn is sucked by a yarn suction device. (5, 5--) (where T is the surface temperature of the heated drawing roller, °C) on the matte surface of the heated drawing roller while rotating, and after gradually starting drawing, heat is applied to the nozzle. A threading method for fluid jet processing is characterized in that the supply of fluid is started and the thread is wound at least twice or more on the mirror surface of the roller.

In the present invention, thermoplastic synthetic fibers refer to polyester, polyamide, polypropylene fibers, etc. Polyamide fibers such as nylon 6 and nylon 66 tend to stick on heated stretching rollers, so the effect of the present invention is particularly large. .

In addition, the matte surface of the heated stretching roller has a roughness of 0.5 to 30.
S, preferably about 1 to 2O8.

Further, the heated fluid injection processing applied to the present invention may be a processing method using a turbulent flow type nozzle as described in Japanese Patent Publication No. 44-13226 and Japanese Patent Publication No. 45-24699, or as described in Japanese Patent Publication No. 33-250. , No. 37-8620, No. 46-
A processing method such as that described in Japanese Patent No. 23766, in which a thread is injected from a nozzle to shape a transparent collision wall, may also be used.

It is also applicable to a processing method in which the yarn is forced into a box using a jet nozzle as described in Japanese Patent Application Laid-open Nos. 47-25450 and 48-1346.

In the present invention, when threading, the yarn is introduced into the yarn guide hole of the nozzle while the supply of heated fluid to the heated fluid injection nozzle is substantially stopped.

When an undrawn yarn is introduced into the nozzle while a heating fluid is being supplied, the yarn is fused at the nozzle yarn guide hole, making it impossible to carry out the threading operation.

Next, while suctioning the yarn introduced into the yarn guide hole of the nozzle with a yarn suction tool such as a suction gun, the yarn is collected and wound (5,5--) on the pear lichen surface of the circumferential surface of the heated stretching roller and gradually stretched. Start 0 Start.

Here, T is the surface temperature of the heated stretching roller in °C, and the optimum temperature range is 140-180QC for nylon 6, 140-230QC for nylon 66, 160-230°C for polyethylene terephthalate, 100-230QC for polypropylene. It is 160°C.

In general, slipping is likely to occur when yarn is wound around the matte surface of a roller, but in the case of heated drawing rollers, the difficulty of slipping depends on the surface temperature of the roller;
, 5--) It has been found that stretching of the undrawn yarn starts at least gradually from the time of winding.

That is, from the time when the undrawn yarn is wound (5,5-1)0 times around the satin-textured surface of the rotating drawing roller, stretching is gradually started to improve the orientation of the yarn.
At the same time as crystallization begins, the yarn diameter decreases, and even if heated fluid is supplied to the nozzle thereafter, the yarn sticks to the roller, wraps around the roller, or fuses within the nozzle yarn guide hole. do not.

If the number of yarn windings on the matte surface is less than (5,5--)0, almost no stretching will occur, and the undrawn yarn will be directly supplied to the nozzle, causing the yarn to fall on the roller. This may cause sticking, wrapping, and fusion within the nozzle hole.

Similarly, from the viewpoint of process stability and reduction of yarn loss, it is desirable that the time for stopping the supply of heated fluid to the nozzle is as short as possible, and when the above number of windings reaches (5, 5 -:] times) It is preferable to start supplying fluid to the nozzle at zero heating.

Furthermore, in the present invention, the yarn is wound on the mirror surface of the heated drawing roller at least twice or more before the supply of the heating fluid is started or after the start of the supply and before the start of winding the yarn into the package. .

By winding the yarn at least twice or more on the mirror surface of the heated drawing roller, the drawing roller is unlikely to slip.
Uniform stretching can be achieved, and the mirror heat transfer effect can provide a sufficient preheating effect to the yarn prior to its introduction into the heated fluid nozzle.

On the other hand, at least the circumferential surface of the heated drawing roller on the yarn exit side is a satin-textured surface, which reduces the tension when the yarn leaves the roller, and furthermore allows the yarn to be delivered to the next heated fluid nozzle in a stable state. It is possible to overfeed.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which threading in a drawing-heated fluid injection processing (DTY processing) apparatus is shown in state diagrams 2a to 2a.
2b is a diagram showing how the yarn is wound around the heated drawing roller of FIG. 1, and FIGS. 3a and 3b are diagrams showing how the yarn is wound in another embodiment of the heated drawing roller of FIG. 1.

In Figures 1 to 3b, Y is a yarn, 1 is an undrawn yarn package, 2 is a heated fluid injection nozzle, 3 is a nozzle yarn guide hole, 4 is a suction gun, 5 is a feed roller, 5' is a trick roller, 6 is a pre-stretch roller, 7 is a heated stretching roller,
8, 8' are thread guides, 9 is an overfeed roller, 1
0 and 11 are presser rollers, 12 is a draft roller, 13 is a winder, 14 is a package, 6', ? ', 9',
12' are separate rollers, 15 are guides, A, C
, C' are matte surfaces, and B and B' are mirror surfaces.

Referring to FIG. 1, the yarn Y is taken out from the undrawn yarn package 1, the yarn is introduced into the yarn guide hole 3 of the nozzle 2 with the supply of heating fluid substantially stopped, and the yarn is introduced into the suction gun 4.
(dotted line).

Next, while suctioning the yarn Y with the suction gun 4, it is passed between the feed roller 5 and the thread roller 5' rotating at a constant peripheral speed using a yarn hanger (not shown), and then
It is wound around a group of pre-stretch rollers 6, 6' which rotate at a constant circumferential speed slightly faster than those of rollers 6, 5'.
The heated drawing rollers 7 and 7' rotate at a constant circumferential speed several times faster than 6', and a part of the circumferential surface of the yarn passage is mirror-finished, and at least the circumferential surface on the exit side of the yarn passage is a satin-finished surface. After winding (5,5--:) or more times on the matte surface and gradually starting stretching, supply of heating fluid to the nozzle 2 is started.

Similarly, the winding of the yarn on the mirror surface of the heated drawing roller is carried out at any point after the (5,5--) recovery winding on the satin surface and before the start of winding the yarn into the package. Perform at least twice.

Subsequently, the yarn Y is wound through yarn guides 8, 8' onto overfeed roller groups 9, 9' which rotate at a constant circumferential speed slower than the draw roller group 7゜7', and then the aforementioned roller group 9゜9
'Draft roller 2 that rotates at a fast constant circumferential speed
．． After winding the fiber into a package 12' and opening it, the winder 13 starts winding it into a package 14.

Next, referring to FIGS. 2a and 2b, the yarn Y is introduced into the nozzle 2, and while being suctioned by the suction gun 4, it is wound around the matte surface A (5,5--) at a rate of 0 and gradually starts drawing. After that (FIG. 2a), it is then wound around the mirror surface B a predetermined number of times, and then further wound around the matte surface C to complete the winding around the heated stretching roller group 7, 7'.

(Figure 2b). Note that the heating fluid is supplied to the nozzle 2 by the second
It may be started in the state shown in FIG. 2a or in the state shown in FIG. 2b.

3a and 3b, the yarn Y is introduced into the nozzle 2 through the guide 15, and while being sucked by the suction gun 4, it is placed on the satin surface C' on the exit side of the yarn path (5, 5 --) winding for more than 0 times and gradually starting to draw (Fig. 3a), by moving the guide 15 to the entrance side of the yarn path in the axial direction of the roller, the yarn Y is wound on the satin surface C.
While or after being transferred to the mirror surface portion B', the sheet is further wound a predetermined number of times to complete the winding around the heating stretching roller group 7, 7' (FIG. 3b).

The supply of heating fluid to the nozzle 2 may be started in the state shown in FIG. 3a or 3b.

Although the present invention has been described in detail with respect to DTY processing in FIGS. 1 to 3b, it is also applicable to so-called 5DTY processing in which spinning, drawing, and heated fluid injection processing are directly connected.

As described above, according to the present invention, the threading method of heated fluid injection processing can be carried out easily, safely and reliably, and it is the dog that contributes to the stabilization and rationalization of the process.

Hereinafter, the present invention will be specifically explained with reference to Examples.

In the examples, the term "crimping rate" refers to the crimping rate of the crimped yarn wound onto the package. A sample length of 1 m was taken under a load of iJ/de and treated with boiling water for 30 minutes in a free state.
0.1 g under standard conditions after drying for a day and night under standard conditions
The value was calculated from the test length 11 after 1 minute under a load of /de using the following formula.

Example An undrawn yarn of 6.8000 de/136 fil of yarn was threaded using the DTY processing device and heated drawing roller shown in Fig. 1 and Figs. 3a to 3b according to the above-mentioned method. Fluid injection processing was performed under the following conditions.

The roller diameter of the heating stretching roller 7 in FIGS. 3a and 3b is 150 mmψ, and the satin surface C' has a roughness of 3S up to 100 an from the roller tip toward the entrance side of the yarn path in the axial direction of the roller.
, 100 to 200f [Iol is a mirror surface B', and the boundary surface between the satin surface and the mirror surface is formed into a wave shape.

At this time, the thread guide 1 is used for threading the heated drawing roller 7.
5 above the satin surface C' along the roller axis direction, and after first winding the yarn Y several times around the mat surface C', supply of heated fluid to the nozzle 2 is started, and then the guide 15 While moving the yarn above the mirror surface B' along the roller axis direction, the yarn is wound around the matte surface C', and the number of windings on the roller is 2 in total.
It was wound 0 times, 12 times on the medium mirror surface B', and 8 times on the satin surface.

For comparison, Table 1 also shows the results when the guide 15 was positioned above the mirror surface B along the roller axis direction and the welt yarn Y was wound around the mirror surface B'.

All of the threading methods of the present invention (Experiments &1 to 3) showed good threading properties, but when the thread was suddenly threaded onto the mirror surface C' as in the conventional method (Experiment A6), threading was impossible.

Furthermore, as shown in Experiment A5, when the number of windings on the matte surface C' was initially small, the threading success rate was similarly poor.

When the temperature of the stretching roller is lower than 80°C (Experiment A4)
Threadability was good, but the crimp rate was low and it could not be put to practical use.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention. Figures 2a and 2b are diagrams showing the state of yarn winding on the heated drawing roller in Figure 1. Figures 3a and 3b are diagrams showing the state of yarn hanging in the DTY processing device. FIG. 2 is a diagram showing a yarn winding state in another embodiment of the heated drawing roller of FIG. 1; Y: Yarn, 2: Heated fluid injection nozzle, 4: Suction gun, 7: Heated stretching roller, A, C, C': Satin surface, B
, B': Mirror surface.

Claims (1)

[Scope of Claims] 1. Stretching an undrawn thermoplastic synthetic fiber yarn by a heated stretching roller in which a part of the circumferential surface of the yarn passage has a mirror surface and at least the exit side circumferential surface of the yarn passage has a satin-finished surface; When immediately introducing the undrawn yarn into a heated fluid injection nozzle for fluid injection processing, the undrawn yarn is introduced into the nozzle while the supply of heated fluid to the nozzle is substantially stopped, and the yarn is removed by a yarn suction device. While suctioning the strip, (5,5--) (where T is the surface temperature of the heating stretching roller, °C) is collected and wound on the matte surface of the rotating heated stretching roller, and the stretching is gradually started. A threading method for fluid jet processing, characterized in that the supply of heated fluid to the nozzle is started and the thread is wound at least twice or more around the mirror surface of the roller.