Rigid polyurethane foam product formed using mold

Details Rigid polyurethane foam product formed using mold Rigid polyurethane foam product formed using mold

B - Operations, Transporting

29

C

B29C 39/02 (2006.01) B29C 39/40 (2006.01) B29C 44/34 (2006.01) B29C 33/00 (2006.01)

Patent

CA 2465298

A formed product (1) produced by injecting a liquid raw material for a rigid polyurethane foam into a mold and subjecting it to a expansion molding, characterized in that the formed product (1) has a section for releasing the reaction heat during the expansion molding consisting of a concave hole or through-hole (4) communicating with the outer surface (3) of the formed product (1) in the volume zone(2) thereof. The ratio of the volume of the section for releasing the reaction heat to that of the apparent volume of the formed product is preferably 0.01 to 0.5. The formed product can be suitably used for producing an energy absorption material.

L'invention concerne un produit formé (1) produit par injection d'un matériau brut liquide destiné à une mousse de polyuréthanne rigide dans un moule et par soumission de celui-ci à un moulage par expansion, caractérisé en ce que le produit formé (1) possède une section qui permet de libérer la chaleur de réaction durant le moulage par expansion laquelle consiste en un trou ou un trou de passage concave (4) communiquant avec la surface extérieure (3) du produit formé (1) dans la zone de volume (2) de celui-ci. Le rapport entre le volume de la section destinée à libérer la chaleur de réaction et celui du volume apparent du produit formé est, de préférence, compris entre 0,01 et 0,5. Le produit formé peut aisément être utilisé aux fins de produire un matériau d'absorption d'énergie.

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