Global Patent Index - EP 1047538 A1

EP 1047538 A1 2000-11-02 - 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

EP 1047538 A1 (EN)

Application

EP 99901251 A

Priority

  • NZ 9900006 W
  • NZ 32961498 A

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 (main, further and additional classification)

B29C 51/32

IPC 8 full level (invention and additional information)

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 (invention and additional information)

B29C 66/3282 (2013.01); B29C 49/50 (2013.01); B29C 51/267 (2013.01); B29C 51/32 (2013.01); B29C 66/1122 (2013.01); B29C 66/43 (2013.01); B29C 66/431 (2013.01); B29C 66/43121 (2013.01); B29C 49/0047 (2013.01); B29C 66/71 (2013.01)

Combination set (CPC)

B29C 66/71 + B29K 2055/02

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

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

INPADOC legal status


2007-08-31 [REG HK WD] APPLICATIONS WITHDRAWN, DEEMED TO BE WITHDRAWN, OR REFUSED AFTER PUBLICATION IN HONG KONG

- Document: HK 1030575

2004-01-07 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030608

2003-05-07 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20030325

2000-11-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000727

2000-11-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT