KR100698512B1 - Dies of blow molding machine equipped with cooling system for parison - Google Patents

Abstract

A dice of a blow molding machine equipped with a parison cooling system is provided to improve productivity of a vessel by rapidly cooling a parison from the temperature of a fused resin to a forming temperature. In a dice of a blow molding machine equipped with a cooling system for a parison(86), a pair of inner dices(12a,12b) and a pair of outer dices(14a,14b) of a die forming a circular orifice(22). A resin discharged through the orifice forms the parison between a pair of blow moldings(88a,88b). An inner wall air ejecting device is installed at the lower part of the inner dice to eject air to the inner wall of the parison before the pair of blow moldings are completely closed. An outer air wall ejecting device is installed on the outer periphery of the parison at the lower part of the outer dice to eject the air to the outer wall of the parison before the pair of blow moldings are completely closed.

Description

DIES OF BLOW MOLDING MACHINE EQUIPPED WITH COOLING SYSTEM FOR PARISON}

1A is an exploded cross-sectional view of a die for a blow molding machine having a parison cooling device according to the present invention.

FIG. 1B is an exploded cross-sectional view of the inner wall air injector and the outer wall air injector in FIG. 1A;

Figure 2a is a state of use of the parison cooling apparatus showing a method of cooling the parison using the parison cooling apparatus according to the present invention.

FIG. 2B is a detailed view of portion 'A' in FIG. 2A.

FIG. 2C is a detailed view of portion 'B' in FIG. 2A.

              Explanation of symbols on the main parts of the drawings

10: die 12a, 12b: inner die

14a, 14b: Outer die 16, 18a, 18b: Air inlet

20: tab 22: orifice

24a, 24b, 28a, 28b: Bolt 26a, 26b: Expansion plate

30: inner wall air spray device 32: upper body

34: air chamber 35: air outlet

36a, 36b: air inlet 38: air outlet upper wall

40: air discharge structure cutting screw 42: bolt fastening

44: nut seat 46: hexagon nut

48: bolt 50: lower body

52: combined hole 54: air exhaust structure female thread

56: air outlet bottom wall 58a, 58b: air exhaust structure cutting handle

60: outer wall air injector 62: upper body

64: hollow 66a, 66b: air inlet

68a, 68b: Air hose connector 70a, 70b: Tap

71: air outlet 72: air chamber

74: air exhaust structural section screw 76: the upper wall of the air outlet

78: lower body 80: air discharge structure cutting screw

82: air outlet bottom wall 84a, 84b: air exhaust structure cutting handle

86: parison 88a, 88b: blow mold

The present invention relates to a die for a blow molding machine having a parison cooling device, and more particularly to a die for a blow molding machine having a cooling device installed between the die and the blow mold of the blow molding machine to cool the inner and outer walls of the parison. will be.

Conventionally, in the case of forming a container using a blow molding machine, a high temperature resin is discharged in a parison form through an orifice of a die and introduced into a blow mold, and the temperature of the parison is a temperature suitable for molding at a hot melt resin temperature. The container was formed by injecting air after delaying the time until natural cooling. However, since the temperature difference between the maximum temperature of the molten resin that passed through the orifice of the die and the molding temperature in the blow mold is large, it takes a long time to cool and the production cycle time is long. The longer the production cycle time, the lower the productivity of the container by the blow molding machine.

The present invention devised to solve the parison cooling problem of the conventional blow molding machine described above provides a die for a blow molding machine having a cooling device that can quickly cool the temperature of the parison to the molding temperature before the mold closing of the blow mold. There is.

In the present invention having the above-mentioned object, in the die for the blow molding machine, the inner die and the outer die of the die form an annular orifice, and the resin discharged through the orifice forms a parison between the blow molds. An inner wall air jetting device capable of injecting air into the inner wall of the parison before the injection mold is completely closed may be installed under the inner die, and air may be injected into the outer wall of the parison before the injection mold is completely closed. Characterized in that the outer wall air injection device is installed on the outer periphery of the lower die lower parison.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the die for blow molding machine having a parison cooling device according to the present invention will be described in detail.

1A is an exploded cross-sectional view of a die for a blow molding machine having a parison cooling device according to the present invention, FIG. 1B is an exploded cross-sectional view showing an inner wall air spraying device and an outer wall air spraying device in FIG. 1A. A state diagram of a parison cooling apparatus showing a method of cooling the parison using the parison cooling apparatus according to the present invention, FIG. 2B is a detailed view of the portion 'A' in FIG. 2A, and FIG. Here is a detailed view of part 'B'.

First, referring to FIG. 2A, the present invention extrudes a resin or continuously performs compression and injection to mold-inject the hot parison 86 between the blowing molds 88a and 88b, and to provide air inside the parison 86. It is applied to a blow molding machine for molding a hollow container by injecting it.

In a blow molding machine, the parison 86 is formed through a die, which is composed of inner dies 12a and 12b and outer dies 14a and 14b, and the inner dies 12a and 12b and the outer die. An annular orifice 22 is formed between the dies 14a and 14b through which the molten resin can pass. The molten resin is discharged through the orifice 22 to form a pipe-shaped parison 86.

2A to 2C, a feature of the present invention is an inner wall air spraying device 30 capable of injecting air into the inner wall of the parison 86 before the blow molds 88a and 88b are completely closed. The outer wall air injector 60 is provided on the inner die lower surfaces 12a and 12b and capable of injecting air to the outer wall of the parison 86 before the injection molds 88a and 88b are completely closed. It is provided in the outer periphery of the listen 86, and it is comprised so that the temperature of a parison may be forcibly cooled from molten resin temperature to the temperature which can be blow-molded.

1A and 1B, after the bolt fastening hole 42 is formed in the inner wall air spraying device 30, and the tab 20 corresponding to the lower surface of the inner dies 12a and 12b is formed, The inner wall air injector 30 is fastened to the lower portion of the inner dies 12a and 12b by bolts 48. In order to facilitate fastening and to prevent loosening, a nut sheet 44 is further formed at the upper end of the bolt fastening hole 42, and a hexagon nut 46 is inserted therein to fasten the bolt 48. desirable. The inner wall air injector 30 receives air through the air inlets 16, 18a and 18b formed in the inner dies 12a and 12b and sprays the inner wall of the parison 86 through the air outlet 35. .

Tabs 70a and 70b to which bolts 24a and 24b may be fastened are formed on the outer wall air injector 60. In addition, the outer plates 14a and 14b are fastened with bolts 28a and 28b extending further outwardly, and stud bolts 24a and 24b are fastened to the extension plates 26a and 26b. By connecting the outer wall air injector 60 by using, the outer wall air injector 60 is configured to be arranged on the outer periphery of the parison. At this time, one end of the study bolt (24a, 24b) is coupled to the expansion plate (26a, 26b), the other end is coupled to the upper tabs (70a, 70b) of the outer wall air injector.

Referring to FIG. 1A, the inner wall air spraying device 30 is coupled to a lower surface of the inner die 12b and has an annular cavity inside the bodies 32 and 50 having a cylindrical shape. 34 and an air inlet connected to air passages 16, 18a, and 18b formed on the inner dies 12a and 12b at the upper portion of the air chamber 34 to receive air at room temperature or below room temperature from the outside ( 36a, 36b, and an air outlet 35 formed inclined from the lower portion of the air chamber 34 toward the lower outer edge of the cylindrical body.

Referring to FIG. 1B, the body of the inner wall air spray device 30 is divided into an upper body 32 and a lower body 50, and the air chamber 34 is formed inside the upper body 32. After opening the lower portion of the air chamber 34, the lower body 50 is preferably configured to be fastened to the open space. At this time, the inner wall of the lower space of the air chamber 34 is formed vertically to form an air discharge structure cutting screw 40, the outer wall of the lower space of the air chamber 34 is formed to be inclined in the outward direction to the air outlet ( It is preferable to comprise so that the upper wall of 35) may be formed.

The lower body 50 coupled to the upper body 32 of the inner wall air spraying device 30 has a coupling hole 52 into which an inner wall of the air chamber 34 of the upper body 32 is inserted at the center thereof. Is formed, the inner wall of the coupling hole 52 is formed with an air discharge structure cutting screw 54 is fastened to the air discharge structure cutting screw 40, it is preferable to be screwed in the space below the air chamber (34). In addition, the outer wall of the lower body 50 is preferably inclined to form an air outlet (35) in combination with the air outlet upper wall 38 of the upper body (32). In this configuration, the air discharge end area of the air outlet 35 can be adjusted according to the screwing degree between the upper body 32 and the lower body 50. In other words, when the lower body 50 is turned to fasten the air exhaust structural cutting screws 40 and 54 deeply, the air discharge end area of the air outlet 35 is narrowed. When the thin body is tightened, the air discharge end area of the air outlet 35 is narrowed. Widens Therefore, the air flow rate, the air pressure, the injection range, and the like can be adjusted by turning the air discharge structural screws 40 and 54 according to the melting temperature of the resin, the type of resin, the thickness of the parison, and the like. The lower body 50 of the inner wall air spraying device 30 is preferably provided with air outlet structure handles (58a, 58b) that can hold the lower body 50 with both hands.

Referring back to FIG. 1A, the outer wall air injector 60 is fixed to the outer circumferential surfaces of the outer dies 14a and 14b and is supported by a cylindrical body having a hollow 64 through which a parison 86 can pass. An air chamber 72 formed in an annular cavity inside the air chamber, and an air inlet formed to penetrate from the air chamber 72 to the outside of the cylindrical body and receive air at room temperature or below room temperature from the outside; 66a, 66b, and an air outlet 71 inclined from the lower portion of the air chamber 72 toward the lower inner corner of the cylindrical body. The air input of the air chamber 72 is made by an air inlet 66a penetrated to the outside and air hose connectors 68a and 68b inserted therein.

In addition, as shown in Figure 1b, the body of the outer wall air injection device 60 is divided into an upper body 62 and a lower body 78, the air chamber 72 is inside the upper body 62 Is formed, it is preferable to configure the lower body 78 is fastened to the open space after the lower portion of the air chamber 72 is opened. At this time, the outer wall of the lower space of the air chamber 72 is formed vertically to form an air discharge structure cutting screw 74, the inner wall of the lower space of the air chamber 72 is formed to be inclined inward to the air outlet 71 It is preferable to comprise so that the upper wall of) may be formed.

The lower body 78 coupled to the upper body 62 of the outer wall air spraying device 60 has a coupling hole 81 into which an inner wall of the air chamber 72 of the upper body 62 is inserted. It is preferable that the inner wall is formed to be inclined inward to form an air outlet 71 in combination with the air outlet upper wall 76 of the upper body 62. In addition, the outer diameter of the lower body 78 is matched with the diameter of the outer wall of the lower chamber of the air chamber 72 of the upper body 62, the air exhaust structure cutting screw 74 is fastened to the air discharge structure cutting screw 74 ( 80 is formed on the outer wall of the lower body 78, so that the lower body 78 is screwed into the lower space of the air chamber 72 of the upper body 62. In this configuration, the air discharge end area of the air outlet 71 can be adjusted according to the screwing degree between the upper body 62 and the lower body 78. That is, when the lower body 78 is tightened to deeply tighten the air discharge structural screws 74 and 80, the air discharge cross-sectional area of the air outlet 71 is narrowed, and when the thin body is tightened, the air discharge end area of the air outlet 71 is narrowed. Widens Therefore, the air volume, the air pressure, the injection range, and the like can be adjusted by turning the air discharge structural screws 74 and 80 according to the melting temperature of the resin, the type of resin, the parison thickness, and the like. The lower body 78 of the outer wall air injector 60 is preferably provided with air outlet structure handles (84a, 84b) to hold the lower body 78 with both hands.

According to the present invention having the above-described configuration, the temperature of the parison can be rapidly cooled from the temperature of the molten resin to the molding temperature, so that the production cycle time can be significantly reduced and the container productivity of the blow molding machine can be greatly improved. It works. In particular, the present invention is a useful invention that can significantly increase container productivity when the present invention is applied to a multihead multi-station blow molding machine.

Claims (3)

The inner dies 12a, 12b and the outer dies 14a, 14b of the die 10 form an annular orifice 22, and the resin discharged through the orifices 22 is blown molds 88a, 88b. In the die for the blow molding machine forming the parison 86 between the Before the blow molds 88a and 88b are completely closed, an inner wall air spraying device 30 capable of injecting air to the inner wall of the parison 86 is installed below the inner die, and the blow molds 88a and 88b are installed. Parison cooling device, characterized in that the outer wall air injection device 60 capable of injecting air to the outer wall of the parison 86 is installed on the outer periphery of the lower die lower parison before the door is completely closed. Dies for blow molding machines. The method of claim 1, The inner wall air injector 30 is coupled to a lower surface of the inner die 12b and has an air chamber 34 formed in an annular cavity shape inside a body having a cylindrical shape, and the air chamber 34 An air inlet (36a, 36b) connected to the air passage (16) formed in the inner die (12a, 12b) from the upper side to receive air at room temperature or below room temperature from the outside, and to the lower portion of the air chamber (34). Die for blow molding machine having a parison cooling device, characterized in that it comprises an air outlet (35) formed inclined toward the lower outer edge of the cylindrical body. The method of claim 1, The outer wall air injector 60 is fixed to the outer circumferential surfaces of the outer dies 14a and 14b and has an annular cavity inside the cylindrical body in which the hollow 64 through which the parison 86 can pass is formed. An air chamber 72 formed in a hollow shape, an air inlet 66a and 66b formed through the air chamber 72 to the outside of the cylindrical body and receiving air at room temperature or below room temperature from the outside; Die for blow molding machine having a parison cooling device, characterized in that it comprises an air outlet (71) formed inclined from the lower portion of the air chamber (72) toward the lower inner corner of the cylindrical body.

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