Biaxially oriented polyethylene film with improved optics...

B - Operations – Transporting – 05 – D

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B05D 1/00 (2006.01) B05D 3/12 (2006.01) B05D 7/04 (2006.01) B29C 55/02 (2006.01) B32B 27/32 (2006.01) B05D 1/26 (2006.01)

Patent

CA 2353447

Methods of preparaing biaxially oriented polyethylene films with improved optics and sealability properties are provided. The methods include stretching in the machine direction a multi-layer base sheet having a core layer with a first and a second side, at least one skin layer and outer surfaces; then coating at least one of the outer surfaces with a resin selected from the group consisting of low density polyethylene, very low density polyethylene, linear low density polyethylene and blends thereof; and finally, stretching the base sheet in a direction transverse to the machine direction.

L'invention concerne des procédés de préparation de films de polypropylène orientés bi-axialement et présentant des propriétés optiques et d'adhérence améliorées. Les procédés comportent l'étirage, suivant la direction de production, d'une feuille de base multicouche présentant une couche noyau, avec un premier et un second côté, au moins une couche superficielle, et des surfaces extérieures, puis le revêtement d'au moins une des surfaces extérieures, avec une résine choisie dans le groupe constitué par le polyéthylène basse densité, le polyéthylène très basse densité, le polyéthylène basse densité linéaire, et des mélanges de ces derniers, et finalement l'étirage de la feuille de base perpendiculairement à la direction de production.

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