JPH074021U - Extrusion molding die - Google Patents

Abstract

(57) [Abstract] [Objective] While the inner and outer blocks forming the inner and outer walls of the discharge port are being cooled, the molten resin flowing from the discharge port is cooled while the inner and outer peripheral surfaces of the molten resin are cooled. By discharging, the resin is efficiently cooled. With the inner and outer blocks C and D forming the inner and outer walls of the discharge port 10 being cooled, the molten resin is discharged from the discharge port 10 while cooling the inner and outer peripheral surfaces of the molten resin flowing inside the discharge port 10. . As a result, the inner and outer peripheral surfaces of the discharged bubbles are already cooled to some extent, and the molten resin is cooled at a temperature lower than the heating temperature of the die main body before being discharged from the discharge port. The resin can be discharged from the discharge port 10, the resin can be efficiently cooled, and the productivity can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an extrusion molding die, and more particularly to an extrusion molding die for forcibly cooling the outer peripheral surface of the molten resin annular discharge port.

[0002]

[Prior art]

 Various types of extrusion molding dies have been developed and used. For example, there is Japanese Examined Patent Publication No. 46-9950. In the extrusion molding die described in the above publication, an evaporation chamber is provided along the outer circumference and the inner circumference of the die molten resin discharge port, and the evaporation chamber is provided at the outer edge portion and the central portion of the die tip respectively for heat exchange. It communicates with the high temperature fluid chamber of the heat exchanger, vaporizes the water accumulated in the evaporation chamber as the die heats, while controlling the refrigerant (cooling water) flowing through the low temperature fluid chamber of this heat exchanger. By arbitrarily determining the heat of vaporization, the molten resin discharge port is cooled to a uniform or different temperature on both the outer and inner circumferences.

[0003]

[Problems to be solved by the device]

 In the forming die of the above publication, low-temperature and high-temperature fluid chambers are formed, refrigerant (cooling water) is supplied to the low-temperature fluid chamber, and an evaporation chamber for storing water is formed. This may complicate the structure of the resin discharge port and increase the diameter of the molding die. This invention improves the drawbacks of the conventional example, and effectively cools the outer circumference and the inner circumference of the molten resin discharge port by using cold air, shortens the cooling time, and improves the productivity. The purpose is to provide an extrusion die to the market.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention relates to an extrusion molding die for cooling the outer circumference and the inner circumference of a molten resin annular discharge opening in an extrusion molding die, and an inner peripheral surface of an inner block forming an inner wall of the discharge opening. The inner cooling chamber provided along with is connected to the cooling air supply passage provided in this die, and the exhaust passage for discharging the cooled air is provided in the molding die in communication with this cooling chamber. This supply path is connected to an air source, and an annular pleated heat radiator is provided along the outer peripheral surface of the outer block forming the outer wall of the discharge port, and the entire circumference of the pleated heat radiator is provided. An annular chamber body that surrounds the chamber is provided outside the outer block, the cold air intake of the chamber body is connected to an air source, and the chamber body forms an annular cooling chamber and Air exhaust to the body It is characterized by having an outlet. In order to solve the above-mentioned problems, the extrusion molding die of this invention may be used for blow molding.

In order to solve the above-mentioned problems, the bottom member of the air ring, the pleated radiator and the annular wall body in the extrusion molding die of the present invention form an outer block forming an outer wall of the discharge port. It is characterized by being fixed with a common bolt along the outer peripheral surface of the. In order to solve the above-mentioned problems, cold air passage holes are provided at the roots of the annular fins of each step in the pleated heat-dissipating body of the extrusion molding die of the present invention, and the cold air passage holes are provided on the same axis. The air outlet is provided.

[0006]

[Action]

 In the invention described in claim 1, the die is heated to a molding set temperature by a heating device such as a band heater, and the molten resin is supplied from an extruder to a resin passage provided in the die, and the discharge port is provided. More molten resin is discharged to extrude pipes, etc., and to cover electric wires. At this time, cooling air is supplied from an air source to the inner cooling chamber provided along the inner peripheral surface of the inner block forming the inner wall of the discharge port through the cooling air supply passage to form the inner wall of the discharge port. The inner block is cooled from the inside, and the cooled and warmed air is exhausted to the outside of the die through the exhaust passage.

Further, cold air is supplied to the annular cooling chamber provided on the outer peripheral surface of the discharge port from a cool air intake port of the chamber body by an air source, and outside the discharge port through the pleated radiator. The outer peripheral surface of the outer block forming the wall is cooled. After this, the cooled and warmed air is exhausted from the air outlet. In this way, while the inner and outer blocks forming the inner and outer peripheral walls of the discharge port are cooled, the molten resin is discharged from the discharge port while cooling the inner and outer peripheral surfaces of the molten resin flowing in the discharge port. The inner and outer peripheral surfaces of the discharged pipe and the like have already been cooled to some extent. As described above, since the outer peripheral surface of the block inside the discharge port is cooled, the molten resin is cooled at a temperature lower than the heating temperature of the die main body before being discharged from the discharge port, and then the melted resin is melted. The resin is discharged from the discharge port, and the temperature thereof is cooled to some extent as compared with the case where the resin is discharged without cooling the discharge port.

According to the second aspect of the invention, in addition to the effect of the first aspect, the contact area of the inner cooling chamber with the cooling air is expanded to form the inner wall of the discharge port. The inner peripheral surface of the side block is sufficiently cooled from the inside. In the device according to the third aspect, the discharged parison is cooled somewhat faster, the cooling time is further shortened, and the productivity is increased. According to the invention described in claim 4, in addition to the effect described in claim 1, cold air flows along the front and back surfaces of each annular fin of the pleated radiator to sufficiently cool the front and back surfaces of each annular fin. The remaining warm air is exhausted from the air outlet directly through the cold air passage hole without making any contact with the peripheral surfaces of the adjacent upper and lower annular ribs. As a result, the outer peripheral surface of the outer block forming the outer wall of the discharge port is efficiently cooled through the pleated radiator, and as a result, the outer wall of the discharge port is forcibly cooled.

[0009]

【Example】

 Next, a typical embodiment of the invention described in claims 1 to 4 will be described. In FIG. 1, A is a blow molding die which is one type of extrusion molding die, and has a structure for cooling the outer circumference and the inner circumference of the molten resin annular discharge port 10 in this die A. That is, the inner cooling chamber 11 provided along the inner peripheral surface of the inner block C forming the inner wall of the discharge port 10 communicates with the cooling air supply passage 12 provided in the die A, and has been cooled. An exhaust passage 13 for discharging air is provided in the die A so as to communicate with the cooling chamber 11. The supply path 12 is connected to a blower (not shown) which is a kind of air source.

An annular pleated radiator 14 is provided along the outer peripheral surface of the outer block D forming the outer wall of the discharge port 10. An annular chamber body 19 that surrounds the entire circumference of the pleated radiator 14 is provided outside the outer block D, and a cool air inlet 16 of the chamber body 19 is a blower that is one type of air source (see FIG. The chamber body 19 forms an annular cooling chamber 23. The chamber body 19 is provided with an air outlet 29. The inner wall of the inner cooling chamber 11 is a pleated heat transfer wall 24, and the upper portion thereof is closed by a top plate 25. Cold air passage holes 28 are provided at the roots of the annular fins 27 of each step in the pleated radiator 14, and the air discharge ports 29 are provided on the same axis as these cold air passage holes 28. Reference numeral 30 is a blow tube provided at the center of the molding die A. This molding die A is used for blow molding air-conditioned deep drawn products for automobiles, containers and the like. The operation of the above-described embodiment is the same as the operation of the invention described in the corresponding claim, and thus the description thereof is omitted here. The molding die may be used for extrusion molding of pipes and covering of electric wires without using the blow pipe 30.

[0011]

According to the invention described in claim 1, the cooling air is supplied through the cooling air supply passage to the inner cooling chamber provided along the inner peripheral surface of the inner block forming the inner wall of the discharge port. Then, the inner block forming the inner wall of the discharge port is cooled from the inside, and the cooled and warmed air is exhausted to the outside of the die through the exhaust passage and is provided on the outer peripheral surface of the discharge port. In the annular cooling chamber, cold air is supplied from the cold air intake port of the chamber body to cool the outer peripheral surface of the outer block forming the outer wall of the discharge port via the pleated radiator, While the inner and outer blocks forming the inner and outer walls of the discharge port are cooled, the molten resin is discharged from the discharge port while cooling the inner and outer peripheral surfaces of the molten resin flowing in the discharge port. Within The outer peripheral surface has already cooled to some extent, and after cooling the molten resin at a temperature lower than the heating temperature of the die main body before discharging it from the discharge port, the molten resin can be discharged from the discharge port, Moreover, the plastic fluidity thereof can be lowered, and the resin can be cooled more efficiently and the productivity can be improved as compared with the case where the resin is discharged without cooling the discharge port.

According to the second aspect of the invention, in addition to the effect of the first aspect, the contact area between the inner wall surface of the inner cooling chamber and the cooling air can be increased, and the inner wall of the discharge port can be The inner peripheral surface of the formed inner block can be sufficiently cooled from the inside. In the device described in claim 3, the effects of the device described in claims 1 and 2 can be obtained. According to the invention described in claim 4, in addition to the effect described in claim 1, cold air is made to flow along the front and back surfaces of each annular fin of the pleated radiator to sufficiently cool the front and back surfaces of each annular fin. After heating, the warmed air can be directly discharged from the air outlet through the cold air passage hole without any contact with the peripheral surfaces of the adjacent upper and lower annular ribs, and more efficiently through the pleated radiator. The outer peripheral surface of the outer block forming the outer wall of the discharge port can be cooled, and as a result, the outer wall of the discharge port can be forcibly cooled.

[Brief description of drawings]

FIG. 1 is a partially omitted vertical sectional view of an embodiment.

[Explanation of symbols]

 A Extrusion die 11 Internal cooling chamber 12 Cooling air supply path 13 Exhaust path 14 Annular pleated radiator 19 Annular chamber body 23 Annular cooling chamber

Claims (4)

[Scope of utility model registration request] 1. An extrusion molding die for cooling the outer circumference and inner circumference of a molten resin annular discharge opening in an extrusion molding die, wherein inner cooling provided along an inner circumference surface of an inner block forming an inner wall of the discharge opening. The chamber is in communication with a cooling air supply passage provided in the die, an exhaust passage for discharging cooled air is provided in the molding die in communication with the cooling chamber,
The supply path is connected to an air source, and an annular pleated radiator is provided along the outer peripheral surface of the outer block forming the outer wall of the discharge port, and surrounds the entire circumference of the pleated radiator. An annular chamber body is provided outside the outer block, a cold air intake of the chamber body is connected to an air source, and an annular cooling chamber is formed in the chamber body and Is an extrusion die, which is provided with an air outlet. 2. The extrusion molding die according to claim 1, wherein an inner wall of the inner cooling chamber is a pleated heat dissipation wall, and an upper portion thereof is closed by a top plate. 3. The inflation film molding die according to claim 1, wherein the molding die is for blow molding. 4. A cold air passage hole is provided at a root portion of the annular fin of each step in the pleated radiator, and the air discharge port is provided on the same axis as the cold air passage hole. The extrusion molding die according to claim 1.