EP 0568534 A4 19931201 - HEAT SEALING METHOD AND APPARATUS
Title (en)
HEAT SEALING METHOD AND APPARATUS
Publication
Application
Priority
US 61213690 A 19901109
Abstract (en)
[origin: WO9208613A1] An L-sealer (10) for sealing thermoplastic films (20) has upper and lower seal bars (38, 48). The upper bar (38) has a protruding seal bed (92) mounted on it by springs (88). The lower bar (48) has a sealing element (116) mounted on a segmented sealing assembly (98) and recessed into the lower bar (48), with a pneumatic lifter (108) underneath the sealing assembly (98). In operation, the upper seal bar (38) descends onto the lower seal bar (48) and the two seal bars are locked together with film to be sealed between them. The pneumatic lifter (108) then inflates, lifting the sealing assembly (98), which contours to any warpage or misalignment of the seal bars (38, 48), pressing the sealing element (116) against the seal bed (92) and pushing the latter back into the upper seal bar (38). After sealing takes place through heat and pressure, the pneumatic lifter (108) deflates, lowering the sealing element (116) and allowing the seal bed (92) to return to its original position through the force of the underlying springs (88). The seal bars (38, 48) are unlocked, and the upper seal (38) bar returns to its original position.
IPC 1-7
IPC 8 full level
B29C 65/00 (2006.01); B29C 65/22 (2006.01); B29C 65/74 (2006.01)
CPC (source: EP US)
B29C 65/224 (2013.01 - EP US); B29C 65/7461 (2013.01 - EP US); B29C 66/003 (2013.01 - EP US); B29C 66/1122 (2013.01 - EP US); B29C 66/244 (2013.01 - EP US); B29C 66/3432 (2013.01 - EP US); B29C 66/431 (2013.01 - EP US); B29C 66/80 (2013.01 - EP US); B29C 66/81427 (2013.01 - EP US); B29C 66/81457 (2013.01 - EP US); B29C 66/8161 (2013.01 - EP US); B29C 66/8221 (2013.01 - EP US); B29C 66/8242 (2013.01 - EP US); B29C 66/82421 (2013.01 - EP US); B29C 66/8244 (2013.01 - EP US); B29C 66/8324 (2013.01 - EP US); B29C 66/849 (2013.01 - EP US); B29C 66/8742 (2013.01 - EP US); B29C 66/81415 (2013.01 - EP US)
Citation (search report)
- [X] EP 0344356 A1 19891206 - URBAN MASCHINENBAU [DE]
- [X] FR 1397917 A 19650507 - WELDOTRON CORP
- [X] US 3287199 A 19661122 - VIRTA NORMAN A
- [X] US 3553059 A 19710105 - STOHLQUIST ROGER H
- [X] DE 1903515 A1 19690918 - WELDOTRON CORP
- [A] GB 2033296 A 19800521 - ROVEMA GMBH
- [A] FR 2102967 A5 19720407 - HOLWEG CONST MEC
- [A] FR 2099589 A1 19720317 - FLUORODYNAMICS INC [US]
- [A] WO 8604559 A1 19860814 - BAXTER TRAVENOL LAB [US]
- See references of WO 9208613A1
Designated contracting state (EPC)
DE ES FR GB
DOCDB simple family (publication)
WO 9208613 A1 19920529; CA 2095870 A1 19920510; EP 0568534 A1 19931110; EP 0568534 A4 19931201
DOCDB simple family (application)
US 9108335 W 19911107; CA 2095870 A 19911107; EP 91920353 A 19911107