JPS6065169A - Resin apply method to yarn - 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 The present invention relates to a method of applying resin to a yarn. It is widely known that weather resistance, heat resistance, abrasion resistance, chemical resistance, etc. can be improved by coating the periphery of a filament with vinyl chloride resin, acrylic resin, urethane resin, etc.

Conventionally, when processing yarns with resin, a method has often been used in which coating resin is applied by dispersing or dissolving it in an organic solvent or water. One method is to soak the yarn in a resin solution, squeeze out the excess resin solution with a mangle or felt, and then dry it. When the viscosity increases, it becomes difficult to apply the resin liquid, and it has the drawback that it can only be used when the amount of resin liquid applied to the yarn is relatively small, up to several tens of percent.

Coating threads with resin liquid provides weather resistance, heat resistance, abrasion resistance,
In order to improve chemical resistance, etc., it is desirable to apply a large amount of coating resin to the yarn, but the highly viscous resin liquid has poor liquid layer separation from the mangle, leading to adhesion spots. This will damage the commercial value of the resulting resin-coated yarn.

Another method of applying a highly viscous resin liquid to a filament is to immerse the filament in the resin liquid and then pass it through a filament passing hole of an appropriate size to obtain the desired amount. There is also a method of applying a resin liquid of The size needs to be changed, and it takes time to pass the thread through the thread passing hole, and troubles such as clogging of the thread passing hole due to foreign matter or drying of resin liquid are likely to occur. When the yarn is a multifilament that easily contains air, the multifilament is coated with resin while containing air between the filaments, and as a result, the air contained in the yarn expands thermally during the heat treatment process such as drying, causing the coating to deteriorate. The problem is that it destroys the resin coating on the surface. As a result, the resin-coated surface becomes uneven, impairing its commercial value, and furthermore, the physical properties of the resin coating deteriorate due to air bubbles, and the adhesion between the filament and the coating resin decreases. A method of applying resin liquid to the yarn material using a slit nozzle with two doctor knives in place of the yarn passage hole has also been considered, and according to this slit nozzle method, the gap can be adjusted arbitrarily. Not only can it be used to thread yarns, it is easy to work with, and even when the yarn to be processed is multifilament, the air contained between the filaments is expelled at the slit nozzle, making it inexpensive and less trouble caused by air bubbles. Although this method is very advantageous in this respect, it has the disadvantage that the exit portion of the slit nozzle is easily contaminated by the resin liquid, and beads of adhesion of the coating resin occur.

The present invention was made in view of the current situation, and an object of the present invention is to provide a method that can easily apply a thick, uniform resin coating to a filament.

The present invention that achieves this object has the following configuration.

That is, in the present invention, the yarn material is immersed in a resin liquid.

Alternatively, after applying an excess resin liquid to the filament by bringing it into contact with a kiss roll partially immersed in the resin liquid.

The thread is passed through a gap between a pair of rolls with a cleaning knife rotating in the opposite direction to the direction in which the thread travels, or through a gap between a roll with a cleaning knife and a doctor knife that rotate in a direction opposite to the direction in which the thread travels. This is a method of applying resin to a threaded article, which is characterized by removing excess resin liquid.

In the present invention, after applying excess resin liquid to the filament, the yarn is passed through a gap between two rotating rolls having a cleaning knife or a gap between a doctor knife and a rotating roll having a cleaning knife. The resin coated yarn is obtained by removing the excessively applied resin liquid.

The resin application method of the present invention will be explained below with reference to nine drawings.

Both FIGS. 1 and 2 are cross-sectional views during processing of an example of the method of applying resin to a yarn material according to the method of the present invention.

In Fig. 1, the resin liquid lifted by the kiss roll (3) partially immersed in the resin liquid (2) is
11 and then a doctor knife (4).

Counter-rotating roll (5) with cleaning knife (6)
The desired resin-coated yarn can be obtained by removing excess resin liquid by passing through a predetermined gap (9) formed between the two.

In Fig. 2, after passing the dip roll (28) immersed in the resin liquid (22) and applying the resin liquid excessively to the filament (21), the cleaning knife (26) 5- (26') is applied. Two counter-rotating rolls (25
) (25') to remove excess resin liquid (20) and obtain the desired resin-coated thread.

Rotating roll with cleaning knife (51 (25)
(25'') is a rotating roll (5) (25) to remove excess resin liquid from the yarn +11 (21) by rotating it in the opposite direction of the traveling direction of the yarn (21).
It is attached to the surface of (25') and removed. The resin liquid adhering to the rotating rolls T51 (25) (25') is removed by cleaning knives (61 (26) (26')) and returned to the resin bath T71 (27).

Therefore, the roll (51 (25) (25')
+ (22) Since a clean surface is always maintained and a gap is formed through which the thread material passes, an excellent resin-coated thread with few adhesion spots can be obtained. When the rotating roll (51 (25) (25') with a cleaning knife is rotated in the same direction as the traveling direction of the yarn material +11 (21), the resin liquid excessively applied to the yarn material (11 (21)) is removed. As the resin liquid (21 (22) becomes more viscous, it may pass through the yarn passage gap and adhere to the yarn object (21) in a patchy manner), or as the resin liquid (21 (22)) becomes more viscous, the liquid may adhere to the yarn object (1) (21). This can cause stringy plaques to develop.

The amount of resin deposited on the resin-coated thread depends on the concentration of the resin liquid (2) (22), the width of the gap between the doctor knife (4) and the rotating roll (5), or the width of the gap between the two rotating rolls (25) (25'). Determined by the size of the gap.

According to experiments conducted by the present inventors, in order to obtain the same amount of resin coating as the resin-coated yarn passed through a round hole nozzle, the width of the yarn passing gap in the method of the present invention is approximately the diameter of the round hole nozzle. It was half. Specifically, the width of the gap corresponding to a round hole nozzle diameter of 0.6 mm is approximately 0.3 II 1 m, and the round hole nozzle is 0.
．． The width of the gap corresponding to 8 mm is approximately 0.4III11
Met.

Since the thread passing gap in the present invention is in the form of a slit, the resin liquid spreads laterally when the thread passes, resulting in a flat state, and the resin liquid adheres more to the extent that the thread spreads laterally. It seems that the gap in the hole may be narrower than the diameter of the round hole nozzle. Further, in the present invention, since the yarn exhibits a flattened state when passing through the gap, the air contained between the filaments of the yarn is expelled and the yarn is coated with resin. Therefore, there was an advantage that troubles caused by air bubbles were extremely small.

What was even more surprising was that the resin-coated yarn, which was supposed to be processed into a flat shape, was bundled together by the surface tension of the resin liquid and the thread tension during processing, and was processed into a uniform round shape.

In the case of a conventional slit nozzle in which two doctor knives are attached to each other, resin liquid accumulates on the outside of the slit nozzle in proportion to the processing speed of the yarn object, and when the resin liquid accumulates to a certain extent, the yarn object is damaged. This has the disadvantage of adhering in a beaded manner, resulting in beaded adhesion spots, and furthermore, when this beaded adhesion occurs, it takes time to dry the beaded areas during the drying process in the subsequent process, resulting in a reduction in processing efficiency. On the other hand, the resin-coated yarn produced by the method of the present invention has a smooth resin-coated surface, and even when the amount of resin adhesion is increased to several hundred percent, it is possible to obtain an excellent resin-coated yarn with good workability and little resin adhesion spots. did it.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are both sectional views showing an example of the resin applying force method of the present invention during processing. In the figure, (1) (21> is a yarn material, (21 (22
) is resin liquid. (3) is a kiss roll, (4) is a doctor knife, +5
1 (25) (25') is cleaning knife +61
(26) a rotating roll having (26'), (7)
(27) is a resin bath, and (2B) is Dibrol. Patent applicant Unitika Co., Ltd.9-

Claims (1)

[Claims] (1) After applying an excess resin liquid to the yarn by immersing the yarn in a resin liquid or by bringing it into contact with a kiss roll partially immersed in the resin liquid, the yarn is moved in the opposite direction of its traveling direction. To the gap between a pair of rolls with cleaning knives rotating in the direction. Alternatively, a method for applying resin to a filament, which comprises removing excess resin liquid by passing it through a gap between a doctor knife and a roll with a cleaning knife that rotates in the opposite direction to the traveling direction of the filament.