Controlling sheet adhesion in laminated glazings

B - Operations – Transporting – 32 – B

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B32B 7/10 (2006.01) B32B 3/08 (2006.01) B32B 17/10 (2006.01)

Patent

CA 2098591

2098591 9211136 PCTABS00014 A method of producing plasticized partial polyvinyl butyral sheet (10) having a desired level of potential adhesion to glass which comprises: i) providing partial polyvinyl butyral resin having a high affinity for adhesion to glass when in sheet form under laminating conditions of elevated temperature and pressure; ii) mixing the resin with plasticizer to form a heat-shapable formulation; iii) extruding the formulation to form a sheet, and formulation; iv) applying a multiplicity of spaced anti-adhesion projections (16) to the surface of the sheet (10) to an extent effective to counteract the high adhesion of the sheet to glass between projections.

Procédé de fabrication d'une feuille en butyral polyvinyle partiellement plastifiée (10) présentant un niveau désiré d'adhérence potentielle sur du verre. Dans ce procédé, i) on utilise une résine composée partiellement de butyral polyvinyle présentant une forte affinité pour adhérer sur du verre lorsqu'elle se trouve sous forme de feuille dans des conditions de stratification dans lesquelles la température et la pression sont élevées, ii) on mélange la résine avec un plastifiant pour former une formulation thermoformable, iii) on extrude la formulation pour former une feuille, et iv) on applique une multiplicité de parties saillantes (16) espacées bloquant l'adhérence, sur la surface de la feuille (10), dont le nombre est suffisant pour composer et contrebalancer la forte adhérence de la feuille sur le verre au niveau des endroits se situant entre les parties saillantes.

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