Forming method of plastic material

A technology of plastic materials and forming molds, which is applied to household appliances, hollow objects, other household appliances, etc., can solve problems such as productivity decline and interruption of forming cycle, and achieve the effect of preventing the accumulation of oligomers and continuous forming operations.

Active Publication Date: 2018-07-13
TOYO SEIKAN GRP HLDG LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this case, however, the forming cycle has to be interrupted for each cleaning job, which leads to a decrease in productivity

Method used

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  • Forming method of plastic material
  • Forming method of plastic material
  • Forming method of plastic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] use has figure 2 The structure shown and the forming mold 30 maintained at 20°C. In the forming die 30, the parting dies 35a, 35b of the neck shell and the main body shell 31 are closed, and the exhaust hole 39 is formed by a discharge groove having a depth of about 20 μm and assuming that it is processed into a roughness of 0.70 μm. degree Ra of the bottom surface. The above molten PET for container molding is injected and filled into the cavity of the molding die 30, and sufficiently cooled in the cavity. Thereafter, the core 31 is slid relative to the main body shell 33, and the mold is opened (see image 3 ). Next, split the split molds 35a and 35b of the neck shell and open the split molds 35a and 35b to take out the preform 50 for a test tube shaped container (refer to Figure 4 ).

[0097] Then, before entering the next injection step, the parting molds 35a and 35b of the neck shell are Figure 5 Closed as shown (vent 39 has been formed at this stage). Th...

Embodiment 2

[0101] After the parting molds 35a and 35b of the neck shell are closed, the core 31 and the main body shell 33 such as Figure 5 In the unclosed state as shown, the air of 5 MPa is introduced into the discharge groove (the mold corresponding to the exhaust hole 39) through the gas flow path 37 near the split surface (the mating surface of the parting molds 35a and 35b of the neck shell). surface) for 1.5 seconds while allowing air to leak to the outside of the mold. After that, the core 31 and the main body case 33 are closed, and the next injection step is performed.

[0102] After repeating the above-mentioned steps 1000 times as in Example 1, it was checked visually whether oligomers adhered to the discharge grooves of the parting dies 35a and 35b of the neck casing. Little to no accumulation of oligomers.

Embodiment 3

[0104] After the parting molds 35a and 35b of the neck shell are closed, the core 31 is inserted, and after having Image 6 With the cavity corresponding to the neck 53 of the preform 50 formed as shown, air of 5 MPa was introduced through the gas flow path 37 for 1.5 seconds, and the air was leaked to the outside of the mold. Thereafter, the main body case 33 is closed and the next injection step is performed.

[0105] After repeating the above steps 1,000 times in the same manner as in Example 1, the molding machine was stopped, and it was observed with eyes to confirm whether the oligomer was attached to the vent hole 39 (the discharge grooves of the parting molds 35a and 35b of the neck shell and the cores). 31 on the surface opposite to the discharge groove). Little to no accumulation of oligomers.

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Abstract

The forming method of the present invention is to use a forming die (30) having a split die structure and having a vent hole (39) communicating with a gas flow path (37) formed on a split surface serving as a butting face of the split die, using the A molding method of a plastic material in which a molding die (30) is resin-molded, the molding method of the plastic material is characterized in that a resin is supplied into the molding die (30) for molding; After the internal removal but before the resin is supplied to the molding die (30) in the next molding cycle, the cleaning gas (G) is injected in a state where at least the part of the molding die (30) including the vent hole (39) is formed. The gas flow path (37) is supplied to the exhaust hole (39); the cleaning gas (G) is discharged from a flow path independent of the gas flow path (37). Using the method described above, it is possible to effectively prevent oligomers from accumulating in the discharge tank, which can be cleaned automatically without stopping the molding cycle.

Description

technical field [0001] The present invention relates to a method of shaping plastic material, and more particularly to a method of shaping plastic material by supplying resin to a forming die to form it into a shape defined by the forming die. Background technique [0002] Plastic materials are easier to shape than inorganic materials such as metals, and thus, have been used in various applications. That is, the heated plastic material is supplied into a predetermined forming die and cooled in the forming die, thereby being formed into various shapes defined by the forming die. [0003] A typical example of a molding method using a molding die is injection molding. Roughly speaking, molten resin is injected and filled into a cavity defined by a pair of split molds, and cooled and solidified in the cavity of the split mold to be formed into the shape of the cavity. [0004] Not limited to the injection molding method, any method of supplying a solid-phase resin in a liquid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/72B29C33/10
CPCB29C33/72B29C2033/727B29C45/1703B29C45/1753B29C45/34B29C33/10B29C45/24B29C45/03B29D22/00
Inventor 小矶宣久市川健太郎中谷丰彦小谷尚史田嶋伴成
Owner TOYO SEIKAN GRP HLDG LTD
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