Polystyrene foam sheet and process of making same

Details Polystyrene foam sheet and process of making same Polystyrene foam sheet and process of making same

C - Chemistry, Metallurgy

08

L

C08L 25/06 (2006.01) B29C 44/12 (2006.01) B29C 44/56 (2006.01) B29C 51/14 (2006.01) B32B 5/18 (2006.01) C08L 21/00 (2006.01) B29C 51/08 (2006.01)

Patent

CA 2166120

A polystyrene foam sheet comprising a polystyrene resin which contains 1 to 15 wt % of a rubber component having a majority of particle sizes less than about 0.45 microns has been found to be superior for forming deep drawn articles. Optionally one or two films may be extrusion coated or laminated to the foam sheet prior to thermoforming. Also disclosed is a method for thermoforming the foam sheet. Preheat the sheet, clamp the sheet between the matched male (10) and female (50) mold members, move the members into final position while applying a vacuum through both members to both sides of the foamed sheet and then chill formed foam to set a final shape.

L'invention concerne une feuille de mousse de polystyrène comprenant une résine de polystyrène qui contient 1 à 15 % en poids d'une gomme dont la majorité des particules ont une grosseur inférieure à environ 0,45 micron, la qualité de cette feuille de mousse étant supérieure pour la production d'articles par emboutissage profond. Eventuellement, un ou deux films peuvent être couchés ou appliqués par extrusion sur la feuille de mousse avant le thermoformage. On décrit également un procédé de thermoformage de la feuille de mousse. Ce procédé consiste à préchauffer la feuille, à serrer la feuille entre les éléments de moulage mâle (10) et femelle (50) correspondants, à mettre ces éléments en position finale tout en appliquant un vide dans les deux éléments sur les deux faces de la feuille de mousse, puis à refroidir la mousse formée afin de lui donner une forme finale.

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