Claims
- 1. A method of injecting a molten material into a mold cavity of an injection molding machine comprising a molding apparatus and an injection apparatus including a heating cylinder and an injection screw reciprocably located therein, comprising the steps of:
- supplying and sealing a pressurized gas into the mold cavity before the start of an injection molding operation; and
- controlling continuously a pressure of the pressurized gas supplied to said mold cavity in accordance with a position of said injection screw during the injection molding operation to maintain a temperature of said pressurized gas in said mold cavity higher than a softening temperature of the molten material to be injected whereby molten material injected into the mold cavity has substantially the same viscosity as that of the molten material before the injection.
- 2. The method according to claim 1 wherein a pressure of the pressurized gas to be supplied to said mold cavity is preliminarily programmed in accordance with at least one of an injection time elapsed, a position of the injection screw during the injection molding operation, a temperature of the molten material, and a pressure of the molten material.
- 3. The method according to claim 1 wherein said molten material is a molten ceramics.
- 4. The method according to claim 1 wherein said pressurized gas is an inert gas.
Priority Claims (1)
Number |
Date |
Country |
Kind |
58-198466 |
Oct 1983 |
JPX |
|
Parent Case Info
This is a continuation-in-part application of U.S. patent application Ser. No. 663,139, filed Oct. 22, 1984 now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
47-20251 |
Sep 1972 |
JPX |
0113539 |
Sep 1980 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
663139 |
Oct 1984 |
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