JPH0718046B2 - Melt spinning head temperature controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a temperature control device capable of rapidly lowering the temperature of a melt-spun head of synthetic fibers as desired.

(Prior Art) When spinning a synthetic fiber filament made of a thermoplastic synthetic resin such as nylon, polyester or polypropylene, a spinning plate, a distribution plate and an introducing plate are sequentially stacked on a spinneret having many spinning holes. Form the base pack,
A molten thermoplastic synthetic resin is supplied from above and is extruded from the spinning hole of the spinneret at the lower end. In order to keep the temperature of the spinneret constant, a heating medium jacket is attached to the outer surface of the spinneret pack, and a high-temperature heating medium is circulated in the heating medium jacket.

(Problems to be Solved by the Invention) Heretofore, the main purpose has been to heat the spinning head in order to keep the temperature constant, and no means for forced cooling has been provided at all. Therefore, when it is desired to lower the temperature, there is no method other than stopping the circulation of the heat medium to allow natural heat dissipation, and it requires a long time to lower the temperature to the desired temperature, especially spinning for maintaining the temperature. By covering the head with a heat insulating material, in addition to the heat medium jacket itself, the heat insulating material on the outside of the heat medium jacket is heated to a high temperature and its heat capacity is large, which hinders the above temperature drop. For example, it took about 1 hour to lower the temperature from 292 ° C to 282 ° C by 10 ° C, and there was a problem that production stopped during that time.

(Means for solving the problem) A heat transfer medium jacket is provided on the outer surface of a spinneret pack consisting of a spinneret, a pass plate, a distribution plate and an introduction plate, and a heat transfer medium for circulating the heat transfer medium to the heat transfer medium jacket is heated. A cooling means for cooling the heat medium is provided together with the heating means. As this cooling means, a cooling jacket is provided on the outside of the heating medium jacket, and a cooling medium such as air or water is supplied to the cooling jacket, and the heating medium, for example, Dowham, is adiabatically expanded during the circulation of the heating medium. Use an expansion tank together. In a multi-division melt spinning apparatus in which a large number of spinnerets are arranged in a straight line, a circular shape, etc., a heat medium jacket can be provided along both sides of the spinneret line.

(Operation) When spinning is started, the cooling means is stopped and the heating means is operated to circulate the heat medium to heat the spinning head in the same manner as in the conventional case, and the on / off control of the heating means is performed. Maintain the desired temperature. When the temperature is set low by changing the lot, etc., the heating means for the heating medium is stopped,
By operating the cooling means while circulating the heat medium, the spinning head is cooled through the heat medium, and the temperature thereof is rapidly lowered. When the cooling medium is circulated in the cooling jacket provided outside the heating medium jacket, the heat of the heating medium jacket and the heat insulating material surrounding the spinning head moves to the cooling medium jacket side, whereby the temperature of the heating medium jacket is increased. The temperature of the spinning head can be lowered to a desired value by adjusting the flow rate of the refrigerant. Further, when the heat medium is adiabatically expanded, the temperature of the heat medium itself in the heat medium jacket decreases, and the temperature of the spinning head decreases with this decrease. By using the above-described refrigerant circulation and adiabatic expansion of the heat medium in combination, the temperature of the spinning head can be lowered at a higher speed.

(Embodiment) In the drawings, a mouthpiece pack 1 is formed by laminating a mouthpiece 3, a super plate 4, two distribution plates 5 and 5 and an introduction plate 6 on a mouthpiece support plate 2 in this order. A jacket 7 is fixed, a heating medium circulating pipe 8 connected to the heating medium jacket 7 is provided with a heating medium boiler (heating medium heating means) 9 and an expansion tank 10 in parallel, and a heating medium is pumped (not shown). Is circulated in the direction of arrow A. In addition, the inlet valve 11 is provided on the inlet side and the outlet side of the expansion tank 10, respectively.
And an outlet valve 12 is provided.

The refrigerant jacket 13 is provided on the side surface of the heat medium jacket 7 described above.
Refrigerant jackets 14 are provided in two rows over the heat medium jacket 7 and the upper surface of the introduction plate 6, and these refrigerant jackets 13, 14, 14, 13 are connected in order by a refrigerant supply pipe 15, and the refrigerant is pumped. It is adapted to be supplied in the direction of arrow B by means of (not shown). An inlet valve 16 is provided at the inlet of the leftmost refrigerant jacket 14. Then, a pipe 17 for distributing molten synthetic resin is connected to the introduction plate 6 at the upper end of the mouth pack 1, and the outer surfaces of the jackets 7, 13 and 14 are covered with a heat insulating material 18.

In the above structure, when the temperature of the spinneret 3 was 292 ° C, the time required to lower it to 282 ° C was 43 minutes in the case of natural heat dissipation, whereas in the refrigerant jacket.
When air at room temperature was passed through 13 and 14 and the heat medium was adiabatically expanded in the expansion tank 10, it took about 1/4 of 8 minutes. Further, it was 10 minutes when only the refrigerant (air) was used, and 20 minutes when only the adiabatic expansion was used.

(Effect of the invention) Since the present invention is provided with the cooling means in addition to the heating means of the heat medium, when the temperature of the spinning head is reset to a low value due to the change of the lot, the temperature is set to be lower than that of the conventional one. Therefore, it is possible to quickly lower the speed, the stop time at the time of changing the lot is shortened, and the production amount is increased. Moreover, according to the present invention, the cooling of the heat medium, that is, the cooling of the spinneret can be performed by the refrigerant jacket provided outside the heat medium jacket, by the adiabatic expansion of the heat medium, and by using both of them together. The spinneret temperature can be lowered more quickly, especially when both are used in combination.

[Brief description of drawings]

The drawings are vertical sectional views of an embodiment of the present invention. 1: Spindle pack, 3: Spinneret, 4: Over plate, 5: Distribution plate, 6: Introduction plate, 7: Heat medium jacket, 8: Heat medium circulation pipe, 9: Heat medium boiler, 10: Expansion tank, 13 , 14: Refrigerant jacket, 15: Refrigerant supply pipe.

Claims (1)

[Claims] 1. A heating medium jacket is provided on the outer surface of a spinneret pack including a spinneret, a pass plate, a distribution plate, an introduction plate, and the like.
A heating medium circulating means connected to the heating medium jacket is provided with heating medium heating means for heating the heating medium and an expansion tank for adiabatic expansion of the heating medium in parallel, and outside the heating medium jacket. A temperature control device for a melt spinning head, characterized in that a cooling medium jacket is provided, and a cooling medium supplying means is connected to this cooling medium jacket to cool the heat medium in the heat medium jacket.