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EP0130769A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Compression molding method

Assignee: Technoplas Inc
•
Filing: 1984-06-25
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Granted: —
•
Expires: 2004-06-25
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Abstract

Abstract A compression molding method comprises detecting actual internal die pressure of molding material filled in a mold cavity (4), and regulating compressive force exerted on the molding material in the mold cavity (4) so as to conform the detected internal die pressure with the predetermined reference internal die pressure. The compressive force exerted on the molding material is controlled by mold clamping mechanism (15) on an extruder in accordance with the prescribed reference internal die pressure given in the form of a waveform, thereby to keep the actual internal die pressure of the molding material in the optimum condition. Consequently, molded products of high quality can be produced continuously.

Inventors

  • 👤 Shouichi Koten

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 11:13
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/76; B29C45/77; B29C45/46; B29C45/56; B29C45/561

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 74 words
A compression molding method which comprises predetermining reference internal die pressure of molding material in a mold cavity (4), detecting actual internal die pressure of the molding material filled in the mold cavity (4), comparing the detected internal die pressure with the predetermined reference internal die pressure, and regulating compressive force exerted on the molding material in the mold cavity (4) to conform the detected internal die pressure with the reference internal die pressure.
Claim 2
Dependent Claim 74 words
A compression molding method which comprises predetermining reference internal die pressure of molding material in a mold cavity (4), detecting actual internal die pressure of the molding material filled in the mold cavity (4), comparing the detected internal die pressure with the predetermined reference internal die pressure, and regulating compressive force exerted on the molding material in the mold cavity (4) to conform the detected internal die pressure with the reference internal die pressure.
Claim 3
Dependent Claim 47 words
A compression molding method according to claim 1, wherein the compressive force exerted on the molding material in the mold cavity (4) is regulated by a closed loop control system (20) in which the detected internal die pressure is compared with the predetermined reference internal die pressure.
Claim 4
Dependent Claim 17 words
A compression molding method according to claim 1, wherein the reference internal die pressure is arbitrarily determined.
Claim 5
Dependent Claim 30 words
A compression molding method according to claim 1, wherein the compressive force exerted on the molding material in the mold cavity (4) is produced by a mold clamping mechanism (15).
Claim 6
Dependent Claim 26 words
A compression molding method according to claim 1, wherein the compressive force exerted on the molding material in the mold cavity is produced by an extruder.
Claim 7
Dependent Claim 22 words
A compression molding method according to claim 1, wherein the reference internal die pressure is given in the form of a waveform.
Claim 8
Dependent Claim 68 words
A compression molding method according to claim 1, wherein reference internal die pressure in a runner is predetermined and actual internal die pressure of the molding material passing through the runner (10) is detected to be compared with the reference internal die pressure in the runner (10), thereby to regulate injection pressure so as to conform the detected internal die pressure in the runner (10) with the corresponding

References Cited (Backward Citations)

GB1459673A Cited
DE2643759A1 Cited

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