KR970058878A

KR970058878A - Gas injection device for blow molding of thermoplastic resin

Info

Publication number: KR970058878A
Application number: KR1019960000567A
Authority: KR
Inventors: 김철주
Original assignee: 구자홍; Lg 전자주식회사
Priority date: 1996-01-12
Filing date: 1996-01-12
Publication date: 1997-08-12

Abstract

본 발명은 금형 내부의 캐버티에 충진된 용융수지의 냉각 및 고화시 두꺼운 부분(이하, 후육부라 함)의 외관에 발생하기 쉬운 표면수축을 방지하기 위하여 상기 후육부에 중공부의 형성을 위한 가스를 주입하는 열가소성 수지의 중공 성형을 위한 가스 주입장치에 관한 것으로서, 저압 가스를 주입하여 용융수지의 후육부에 자연발생식으로 중공부를 형성시키기 때문에 상기 저압 가스를 고압 가스로 변환시키기 위한 장비가 대폭감소되어 소형화가 가능하고, 취급이 용이하며, 특수 역지밸브가 장착되지 않은 일반적인 사출기를 이용할 수 있는 잇점이 있다.In order to prevent surface contraction, which is likely to occur in the appearance of a thick part (hereinafter referred to as thick part) at the time of cooling and solidification of a molten resin filled in a cavity in a mold, a gas for forming a hollow part Pressure gas is injected into a hollow portion of a molten resin to spontaneously form a hollow portion. Therefore, the apparatus for converting the low-pressure gas into a high-pressure gas has a large width It is possible to use a general injection molding machine which can be downsized, is easy to handle, and is not equipped with a special check valve.

Description

Gas injection device for blow molding of thermoplastic resin

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제1도는 종래 기술에 의한 열가소성 수지의 사출 성형장치의 구성을 나타내는 도면,FIG. 1 is a view showing a constitution of an injection molding apparatus of a thermoplastic resin according to the prior art,

제2도는 종래 기술에 의한 열가소성 수지 성형품의 구조를 나타내는 도면,FIG. 2 is a view showing a structure of a thermoplastic resin molded article according to the prior art,

제3도는 본 발명에 의한 금형 및 열가소성 수지의 중공성형을 위한 가스주입장치의 구성을 나타내는 도면,FIG. 3 is a view showing a configuration of a gas injection apparatus for blow molding of a mold and a thermoplastic resin according to the present invention,

Claims

Gas injection means for injecting gas into the cavity in the mold; Valve means for intercepting and passing gas flowing to the gas injection means side through connection means connecting the gas injection means and the gas supply means and discharging the gas injected into the cavity; A valve driving means for driving the valve means in the corresponding mode when the gas passage time and the discharge time point of the valve means are set, and when the set time is reached; And a control means for controlling on / off of the valve driving means.

2. The thermoplastic resin according to claim 1, wherein the valve means is a solenoid valve including a first solenoid for selecting the passage mode and a second solenoid for selecting a gas discharge mode of the gas discharge mode A gas injection device for blow molding.

[Claim 3] The method according to claim 2, wherein the valve driving means comprises a first timer for driving the first solenoid when the gas is passed, and a second timer for driving the second solenoid when the gas is discharged. Gas injection device for blow molding of resin.

The gas injection device for blow molding of a thermoplastic resin according to claim 1, characterized by comprising a pressure measuring means for measuring a pressure of gas supplied from the gas supply means.

The gas injection device for blow molding thermoplastic resin according to claim 1, wherein the gas injection device comprises a check valve for preventing backflow of gas supplied from the gas supply device.

The gas injection apparatus for blow molding of a thermoplastic resin according to claim 1, further comprising a pressure measuring means for measuring a pressure of gas injected into the cavity in the mold.

※ Note: It is disclosed by the contents of the first application.