EP 1047538 A1 20001102 - APPARATUS AND METHODS FOR TWIN SHEET THERMOFORMING
Title (en)
APPARATUS AND METHODS FOR TWIN SHEET THERMOFORMING
Title (de)
GERÄT UND VERFAHREN ZUM THERMISCHEN FORMEN VON ZWILLINGSFOLIEN
Title (fr)
DISPOSITIF ET PROCEDES DE THERMOFORMAGE DE DEUX FEUILLES
Publication
Application
Priority
- NZ 9900006 W 19990121
- NZ 32961498 A 19980121
Abstract (en)
[origin: WO9937465A1] 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 from of the invention 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 invention 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.
IPC 1-7
IPC 8 full level
B29C 49/50 (2006.01); B29C 51/32 (2006.01); B29C 65/00 (2006.01); B29C 69/00 (2006.01); B29C 49/00 (2006.01)
CPC (source: EP KR)
B29C 49/50 (2013.01 - EP); B29C 51/267 (2013.01 - EP); B29C 51/32 (2013.01 - EP KR); B29C 66/1122 (2013.01 - EP); B29C 66/3282 (2013.01 - EP); B29C 66/43 (2013.01 - EP); B29C 66/431 (2013.01 - EP); B29C 66/43121 (2013.01 - EP); B29C 49/0691 (2022.05 - EP); B29C 66/71 (2013.01 - EP)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9937465 A1 19990729; AU 2078999 A 19990809; AU 752661 B2 20020926; BR 9907185 A 20001017; CA 2318933 A1 19990729; CN 1288408 A 20010321; EP 1047538 A1 20001102; EP 1047538 A4 20030507; JP 2002500968 A 20020115; KR 20010034248 A 20010425; TW 564304 B 20031201
DOCDB simple family (application)
NZ 9900006 W 19990121; AU 2078999 A 19990121; BR 9907185 A 19990121; CA 2318933 A 19990121; CN 99802270 A 19990121; EP 99901251 A 19990121; JP 2000528419 A 19990121; KR 20007007926 A 20000720; TW 88102483 A 19990220