B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/00 (2006.01)
Patent
CA 2349603
Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
L'invention concerne des systèmes et des procédés de moulage par injection convenant à la fabrication de matériaux microcellulaires expansés ainsi que des articles microcellulaires. Le taux de perte de charge et le taux de cisaillement représentent des caractéristiques importantes dans certains modes de réalisation; l'invention concerne des systèmes permettant de réguler ces paramètres dans un système de moulage par injection. D'autres aspects de l'invention concernent un système de moulage par injection comprenant un agent de nucléation situé en amont d'un moule pressurisé; un système d'extrusion comprenant une vis-piston servant à former un solution à phase unique d'agent gonflant non nucléé et de matériaux polymères; un matériau microcellulaire à parois très minces et un matériau polymère à parois très minces; et un procédé permettant de réduire fortement la masse de parties à parois très minces ayant des surfaces qui ne présentent pas de différences notables par rapport aux parties non expansées.
Anderson Jere R.
Cha Sung W.
Chen Liqin
Laing Dana E.
Pierick David E.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Trexel Inc.
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