Production method of synthetic and yarn traverse device

Abstract

In the process of drawing / heat treating synthetic fiber thread melted and spun via a plurality of godet rollers and subsequently winding the same, accumulation of extraneous matter on the surface of the godet rollers may be prevented by performing multistage drawing / heat treatment while reciprocating the thread in the direction of the axis of rotation of the godet roller using the godet rollers at least two of which have surfaces having the roughness of 0.5<=Ra<=5 and one of which has a surface at a temperature of at least (melting point of synthetic fiber-70° C.), whereby occurrence of thread breakage or generation of fuzz may be prevented and synthetic fiber whereof the rate of operation can be increased and efficiency of manufacture is improved may be obtained.

Description

[0001] 1. Field of the Invention[0002] In the manufacture of synthetic fiber, especially, of industrial fiber formed by drawing / heat treatment of undrawn thread by the use of a plurality of godet roller groups, the present invention relates to a method of manufacturing high-strength synthetic fiber for maintaining drawing / heat treatment of synthetic fiber stable for a long term by resolving problems such as thread breakage or generation of fuzz to avoid accumulation of extraneous matters on the surface of high-temperature godet rollers, for increasing the rate of operation by reducing the number of times the machine have to be stopped for removing extraneous matters from the godet rollers, and for improving productive efficiency by reducing abrasion of the surface of the godet roller, and a thread traversing device to be used directly in the same method.[0003] 2. Description of the Related Art[0004] In the manufacture of synthetic fiber as typified by polyamide or polyester, among o...

AI Technical Summary

Benefits of technology

[0051] The temperature below this value (the melting point of synthetic fiber thread-70.degree. C.) is not preferable for the manufacture of industrial fiber, which is the object of the invention, from such reasons that stable drawing cannot be performed, and heat dimension stability of the drawn yarn is lowered due to insufficient heat treatment. When performing heat treatment under such a high temperature condition, a heat-transformed matter caused by spinning oil attached on the thread is accumulated on the surface of the godet roller, which leads to increase in a single filament breakage or thread breakage, but according to the invention, accumulation of such transformed spinning oil may be prevented by reciprocating the thread in the direction of the axis of rotation of the godet roller. In other words, according to the invention, transformation and accumulation of residue of spinning oil may be prevented by organic unity of the constructions described above, and thus the manufacture of high-strength industrial fiber may be performed stably. When the surface roughness Ra of the roller for performing the heat treatment is smaller than 0.5 .mu.m, the contact area between the traveling thread and the roller increases. Therefore, even when the thread is moved in the direction of the axis of rotation of the godet roller, the transformed matter sticks to the surface of the roller, and thus the transformed matter may be accumulated on both ends of the amplitude of the movement, which hinders the effect of the invention. On the other hands, when the surface roughness Ra of the roller is in the range between 0.5 .mu.m and 0.5 .mu.m, and the thread is moved in the direction of the axis of rotation of the godet roller, accumulation of transformed spinning oil can be prevented, thereby achieving the object of the invention. In the range between 1 .mu.m and 3 .mu.m, the effect of the invention will be more distinctive.

[0052] When the thread is reciprocated by moving the thread converging guide, occurrence of a single filament breakage due to abrasion as a result that filaments are separated during movement of the thread guide may be prevented.

[0053] The thread converging guide here serves to fix up the traveling thread during spinning and drawing of synthetic fiber, and is, more preferably, a guide for fixing up the spinning thread.

[0054] As the method of reciprocating the thread converging guide, a method using means f or converting rotary motion into reciprocating motion, such as a method of converting rotary motion of the motor to reciprocating motion via a cam, a method of conversing rotary motion of the motor to reciprocating motion via a ball screw, a method of repeating linear motion of the cylinder to obtain reciprocating motion, and a method of converting to reciprocating motion via a gear provided on the stepping motor may be employed.

[0055] In the case where the total fineness is not less than 200 dtex, the amount of spinning oil attached on the roller increases, and the effect of the invention will be distinctive.

[0056] According to the invention, by setting the drawing tensile stress during the last drawing step to at least 1.4 cN / dtex, further distinctive effect may be obtained. In other words, when the drawing tensile strength is not less than this value, high-strength fiber not less than 6.0 cN / dtex can be obtained and thus the effect of the transformed spinning oil is distinctive.

Problems solved by technology

This drawing / heat treatment process of undrawn thread been suffering from such phenomenon that attachment and accumulation of extraneous matters dropped from the traveling thread on the surface of the godet rollers with time causes abnormal states of drawing, which has a serious impact on the quality / appearance and productive efficiency of fiber obtained.

The abnormal states of drawing here include winding of traveling thread on the godet roller, generation of fuzz due to breakage of a filament of the thread, and breakage of the thread itself due to increase in surface frictional force caused by the external matters attached and accumulated on the surface of the godet roller.

There is recognized an unfavorable phenomena that the extraneous matters attached and accumulated on the godet roller set at a high temperature near the melting point of polymer block heat transmission between the godet roller and the thread, which results in insufficient heat treatment of the thread, and thus variations in quality / appearance of the obtained drawn thread with time.

Since stain on the surface of the godet roller that is set to a high temperature may occur in relatively a short time, and may cause the abnormal states of drawing as described above, the process of cutting the thread compulsory regularly or every time the abnormal states are detected, and stopping the operation of the drawing machine to remove the extraneous matters on the godet roller is made frequently.

Therefore, the problem of lowering of the productive efficiency and of appearance of the product has been in the news.

However, in the manufacture of industrial fiber, a high-temperature heated roller is used as a godet roller in many cases, and thus the aforementioned scraper blade or the rotating brush cannot remove accumulated deposits easily.

In addition, since the thick thread is drawn by a high tensile stress, there is also a problem in that the devices such as the scraper blade or the rotating brush mounted in the vicinity of the godet roller are frequently broken due to the thread wound on the roller after breakage of the thread.

Therefore, generation of transformed spinning oil cannot be sufficiently prevented simply by reciprocating the thread on the godet roller by the use of the thread guide, and thus transformed spinning oil is accumulated on both ends of the reciprocating motion of the thread guide, which may result in increase in thread breakage or generation of fuzz with time.

In order to a void such phenomena, the machine has to be stopped many times in order to remove the extraneous matters on the godet roller, which impairs increase of the rate of operation.

In addition, in the manufacture of industrial fiber, drawing operation aiding units such as an air guide for preventing a single filament breakage on the roller, a heat treatment cylinder for fixation of a drawing point, and a heat plate and a heat treatment cylinder for aiding drawing operation are provided among a plurality of drawing rollers in many cases, and thus misalignment between these drawing operation aiding units and the traveling thread when the traveling thread is reciprocated, which may result in breakage of the traveling thread due to abrasion with these drawing operation aiding units.

5 .mu.m or larger than 5 .mu.m, since the frictional force generated between the thread and the roller increases, drawing of the thread on the roller becomes increasingly difficult, and thus it becomes difficult to prevent generation of a single filament breakage to obtain a high-strength fiber.

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