JPS568222A - Heat extrusion method for formed article - Google Patents
Heat extrusion method for formed articleInfo
- Publication number
- JPS568222A JPS568222A JP8259779A JP8259779A JPS568222A JP S568222 A JPS568222 A JP S568222A JP 8259779 A JP8259779 A JP 8259779A JP 8259779 A JP8259779 A JP 8259779A JP S568222 A JPS568222 A JP S568222A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- formed article
- end parts
- heating
- conduit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
PURPOSE: To prevent a hollow formed article from being damaged when it is extruded from a mold by a method wherein the mold is rotated and supplied with a heating medium in such a manner that the expansion of the mold by heating starts from both end parts thereof and gradually proceeds up to the middle part thereof.
CONSTITUTION: A mold 12 is rotated by a driving device 22. Then, a heating medium, such as raw steam, is introduced near to the outer-peripheral surface of the mold 12 through a conduit 38 and supplied to both end parts of the mold 12 in larger quantities than to the middle part thereof from many jet orifices provided in the conduit 38. In this way, the expansion by heating is caused first in both end parts of the mold where it is rather hard to occur and then proceeds gradually to the middle part so as to cause continuous slackening between the mold 12 and a formed article 14, thereby the occurrence of damage on the formed article 14 in extrusion from the mold 12 is prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54082597A JPS5820766B2 (en) | 1979-07-02 | 1979-07-02 | Heat demolding method for molded products |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54082597A JPS5820766B2 (en) | 1979-07-02 | 1979-07-02 | Heat demolding method for molded products |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS568222A true JPS568222A (en) | 1981-01-28 |
JPS5820766B2 JPS5820766B2 (en) | 1983-04-25 |
Family
ID=13778887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54082597A Expired JPS5820766B2 (en) | 1979-07-02 | 1979-07-02 | Heat demolding method for molded products |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5820766B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4952528A (en) * | 1972-09-20 | 1974-05-22 | ||
JPS4962528A (en) * | 1972-10-19 | 1974-06-18 |
-
1979
- 1979-07-02 JP JP54082597A patent/JPS5820766B2/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4952528A (en) * | 1972-09-20 | 1974-05-22 | ||
JPS4962528A (en) * | 1972-10-19 | 1974-06-18 |
Also Published As
Publication number | Publication date |
---|---|
JPS5820766B2 (en) | 1983-04-25 |
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