EP 1937455 A2 20080702 - APPARATUS AND METHOD FOR ADVANCED STRUCTURAL FOAM MOLDING
Title (en)
APPARATUS AND METHOD FOR ADVANCED STRUCTURAL FOAM MOLDING
Title (de)
VORRICHTUNG UND VERFAHREN ZUM FORTSCHRITTLICHEN STRUKTURSCHAUMSTOFF-SPRITZGIESSEN
Title (fr)
DISPOSITIF ET PROCEDE POUR LE MOULAGE EVOLUE DE MOUSSE STRUCTUREE
Publication
Application
Priority
- IB 2006003364 W 20060830
- CA 2517995 A 20050902
- US 21930905 A 20050902
Abstract (en)
[origin: WO2007026257A2] An advanced structural foam molding technology for improving the dispersion of the blowing agent in the polymer matrix has been invented, This technological innovation is an Improvement on the well-known existing low-pressure structural foarn molding technology based on the preplasticating-type (so called piggy-bag) injection-molding machines. By introducing means for continuing the polymer matrix melt flow stream, preferably an additional accumulator and a gear pump, the processing conditions become more consistent to disperse the injected gas more uniformly in the polymer matrix. By using this technology, the structural foams have a smaller cell size, a more uniform cell structure, a larger void fraction (i.e., more material saving), less surface swirl, and less weld line contrast.
IPC 8 full level
B29C 44/02 (2006.01); B29C 45/47 (2006.01)
CPC (source: EP)
B29C 44/3442 (2013.01); B29C 44/3469 (2013.01); B29C 44/421 (2013.01)
Citation (search report)
See references of WO 2007026257A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2007026257 A2 20070308; WO 2007026257 A3 20070802; EP 1937455 A2 20080702
DOCDB simple family (application)
IB 2006003364 W 20060830; EP 06820982 A 20060830