JPS55137917A - Film-molding method - Google Patents
Film-molding methodInfo
- Publication number
- JPS55137917A JPS55137917A JP4517779A JP4517779A JPS55137917A JP S55137917 A JPS55137917 A JP S55137917A JP 4517779 A JP4517779 A JP 4517779A JP 4517779 A JP4517779 A JP 4517779A JP S55137917 A JPS55137917 A JP S55137917A
- Authority
- JP
- Japan
- Prior art keywords
- film
- mold
- lowered
- small holes
- pressure
- 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.)
- Pending
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
PURPOSE: To prevent uneven stretching of a film and to enable the production of a film with a uniform thickness, by a method wherein a mold is pushed against a film with hot air blown against a film surface through small holes in a bottom surface of a convex mold, and air is then sucked through the small holes.
CONSTITUTION: A film 3 is fed with a lower molding box 1' lowered. The film 3 is secured in a given position by raising the lower molding box 1' again, and is heated by means of a heater 2. After the film is heat-softened, a convex mold 5 is lowered gradually down to the molding depth while hot air is blown out through small holes 7 to mold partially the film 3. After the convex mold 5 is lowered to a given level, it stops being lowered, and the pressure is reduced by sucking air in a space between the film 3 and the mold through the small holes, whereby the film 3 is adhered closely to the mold. When molding is complete, the pressure at the inside of the mold 5 is returned to an atmosphere pressure, the lower molding box 1', simultaneously, being lowered when the convex mold 5 is raised. And in this way, a molding process is finished.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4517779A JPS55137917A (en) | 1979-04-13 | 1979-04-13 | Film-molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4517779A JPS55137917A (en) | 1979-04-13 | 1979-04-13 | Film-molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55137917A true JPS55137917A (en) | 1980-10-28 |
Family
ID=12711979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4517779A Pending JPS55137917A (en) | 1979-04-13 | 1979-04-13 | Film-molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55137917A (en) |
-
1979
- 1979-04-13 JP JP4517779A patent/JPS55137917A/en active Pending
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