JPS5574847A - Metal mold for molding synthetic resin lid cap - Google Patents
Metal mold for molding synthetic resin lid capInfo
- Publication number
- JPS5574847A JPS5574847A JP14865678A JP14865678A JPS5574847A JP S5574847 A JPS5574847 A JP S5574847A JP 14865678 A JP14865678 A JP 14865678A JP 14865678 A JP14865678 A JP 14865678A JP S5574847 A JPS5574847 A JP S5574847A
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- mould
- lid cap
- point
- line
- 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
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
PURPOSE: To prevent shrinkage of molded synthetic resin lid cap and to provide good appearance thereof by avoiding its unbalanced shrinkage after its separation from mould in suck a way that inner face of mould cavity is designed in a specific configuration.
CONSTITUTION: Mould cavity 10 is constituted by a space between mould core 20 and outer mould 11 having flat ceiling face 12 of which annular corner has radius R of curvature terminating at its lowest point A. Straight imaginary line l is defined by the point A and the lowermost point B of the outer mould 11. Desired thickness 2 of side wall of completed lid cap is determined by the thickness at the lowest point D of core packing land which extends in parallel with the line l. Thickness of the cavity 10 at the uppermost point of the packing land is designed suck that it is thicker than the desired thickness α by an additional thickness β which is represented by a segment EF extending radially outwardly from the line l and which is determined by the shrinkage coefficient of the thickness α. The inner side face of the outer mould 11 is determined by a curved line between point A and F and a straight line between points F and B, and these lines AF and FB are to be smoothly extended without discontinuty from the ceiling face 12 including corner R. A synthetic resin lid cap molded in the cavity 10 will have its slightly swelled out side surface on its packing land by the additional thickness β when it is separated from the moudls 11 and 20, but it will shrink to the desired thickness 2 with no unbalanced shrinkage as it is cured, resulting in a well molded lid cap with good appearance and no deformation.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14865678A JPS5574847A (en) | 1978-12-01 | 1978-12-01 | Metal mold for molding synthetic resin lid cap |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14865678A JPS5574847A (en) | 1978-12-01 | 1978-12-01 | Metal mold for molding synthetic resin lid cap |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5574847A true JPS5574847A (en) | 1980-06-05 |
JPS6134968B2 JPS6134968B2 (en) | 1986-08-11 |
Family
ID=15457675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14865678A Granted JPS5574847A (en) | 1978-12-01 | 1978-12-01 | Metal mold for molding synthetic resin lid cap |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5574847A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002234036A (en) * | 2001-02-09 | 2002-08-20 | Snow Brand Milk Prod Co Ltd | Molding die for plastic wrapping container |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5221064A (en) * | 1975-08-09 | 1977-02-17 | Mitsubishi Petrochemical Co | Method and device for injection molding crystalline thermoplastic synthetic resin product |
-
1978
- 1978-12-01 JP JP14865678A patent/JPS5574847A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5221064A (en) * | 1975-08-09 | 1977-02-17 | Mitsubishi Petrochemical Co | Method and device for injection molding crystalline thermoplastic synthetic resin product |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002234036A (en) * | 2001-02-09 | 2002-08-20 | Snow Brand Milk Prod Co Ltd | Molding die for plastic wrapping container |
Also Published As
Publication number | Publication date |
---|---|
JPS6134968B2 (en) | 1986-08-11 |
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