Oriented hdpe films with skin layers

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/18 (2006.01) B29C 55/02 (2006.01) B32B 27/08 (2006.01) B32B 27/32 (2006.01)

Patent

CA 2175833

Readily castable high density polyethylene (HDPE) films, preferably containing broad molecular weight distribution HDPE resin having treated upper skin layers and untreated lower skin layers, preferably coextruded, on each side. The treated upper skin layer is derived from a polymer, e.g. ethylene-propylene-butene-1 terpolymer, and the lower skin layer is derived from a polymer such as ethylene- propylene-butene-1 terpolymer and LDPE compounded with silicone oil. Such skin layers provide a film which is readily castable while maintaining the desirable properties of HDPE including dead fold, twist retention, TD tear and moisture barrier. The films are cast, and oriented in the solid state up to about two times in the machine direction and six times or more in the transverse direction to give films having good dead-fold characteristics making them highly suited for packaging, particularly for dry foods.

Films de polyéthylène à haute densité (PEHD) facilement moulables faits de préférence de résine PEHD à large distribution du poids moléculaire revêtus de couches superficielles supérieures traitées et de couches superficielles inférieures non traitées, de préférence coextrudées, sur chacune de leurs faces. La couche supérieure traitée est en polymère p. ex. un terpolymère d'éthylène-propylène-butène-1, et la couche inférieure, en terpolymère d'éthylène-propylène-butène-1 et en PEBD associé à de l'huile de silicone. Ces revêtements donnent un film facilement moulable, qui conserve les propriétés souhaitées du PEHD telles que l'absence de plis, la conservation de la torsion, la facilité transversale de déchirement et l'arrêt de la vapeur. Ces films sont moulés et orientés à l'état solide jusqu'à deux fois environ dans le sens machine et six fois ou plus dans le sens transversal, de façon à donner des films présentant une bonne résistance aux plis, ce qui les rend bien adaptés à l'emballage et en particulier à celui des produits alimentaires secs.

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