Process for thermoforming acrylic polymer employing foam as...

Details Process for thermoforming acrylic polymer employing foam as... Process for thermoforming acrylic polymer employing foam as...

B - Operations, Transporting

29

C

B29C 51/10 (2006.01) B29C 33/40 (2006.01)

Patent

CA 2743179

The present invention is directed to a process of thermoforming an acrylic polymer containing sheet by heating the sheet in a mold which comprises (a) a foam which would degrade if in contact with the heated sheet and (b) a thermal barrier which is intermediate the sheet and foam to prevent the foam from degrading. In many applications, the resulting article can be used without removal of the foam. Also, the foam can serve to protect the acrylic sheet such as during long distance shipping. The present invention is also directed to a mulitlayered article.

La présente invention concerne un procédé de thermoformage d'une feuille contenant un polymère acrylique par le chauffage de la feuille dans un moule comprenant (a) une mousse qui se dégrade quand elle est en contact avec la feuille chauffée et (b) une barrière thermique placée entre la feuille et la mousse pour empêcher la dégradation de la mousse. Dans de nombreuses applications, l'article résultant peut être utilisé sans retirer la mousse. En outre, la mousse peut servir à protéger la feuille acrylique, par exemple lors d'un transport sur une longue distance.

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