NZ505803A - Twin sheet thermoforming mould having one mould half with a retractable pinch off region to assist in shearing off the seam of a thermoformed article - Google Patents
Twin sheet thermoforming mould having one mould half with a retractable pinch off region to assist in shearing off the seam of a thermoformed articleInfo
- Publication number
- NZ505803A NZ505803A NZ505803A NZ50580399A NZ505803A NZ 505803 A NZ505803 A NZ 505803A NZ 505803 A NZ505803 A NZ 505803A NZ 50580399 A NZ50580399 A NZ 50580399A NZ 505803 A NZ505803 A NZ 505803A
- Authority
- NZ
- New Zealand
- Prior art keywords
- mould
- seam
- region
- pinch
- mould half
- Prior art date
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A method of twin sheet thermoforming is provided in which the seam (1) between sheets (7, 8) is trimmed from the finished part by a shearing action between cooperating edges of the mould halves (3, 4). In the preferred form, one mould half (4) is provided with a moveable pinch-off region (13) which retracts under pressure from the other mould half (3) to leave an edge of the mould half (4) adjacent the mould cavity which cooperates with an edge of the mould cavity of the other mould half (3) to provide the shearing action. The moveable pinch-off region may be a pinch-off member (13) supported in an annular channel (14) by a pre- compressed spring (15). The method allows significant plastic displacement of the material in the seam region for weld reinforcement along with trimming of the seam from the formed part within the mould in a one step process.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ505803A NZ505803A (en) | 1998-01-21 | 1999-01-21 | Twin sheet thermoforming mould having one mould half with a retractable pinch off region to assist in shearing off the seam of a thermoformed article |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ32961498 | 1998-01-21 | ||
NZ505803A NZ505803A (en) | 1998-01-21 | 1999-01-21 | Twin sheet thermoforming mould having one mould half with a retractable pinch off region to assist in shearing off the seam of a thermoformed article |
PCT/NZ1999/000006 WO1999037465A1 (en) | 1998-01-21 | 1999-01-21 | Apparatus and methods for twin sheet thermoforming |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ505803A true NZ505803A (en) | 2002-11-26 |
Family
ID=26651873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NZ505803A NZ505803A (en) | 1998-01-21 | 1999-01-21 | Twin sheet thermoforming mould having one mould half with a retractable pinch off region to assist in shearing off the seam of a thermoformed article |
Country Status (1)
Country | Link |
---|---|
NZ (1) | NZ505803A (en) |
-
1999
- 1999-01-21 NZ NZ505803A patent/NZ505803A/en not_active IP Right Cessation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PSEA | Patent sealed | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
EXPY | Patent expired |