High density polyethylene film with high biaxial orientation
Номер патента: EP0929583A1
Опубликовано: 21-07-1999
Автор(ы): John Alan Larter, Robert Victor Poirier
Принадлежит: Mobil Oil Corp
Опубликовано: 21-07-1999
Автор(ы): John Alan Larter, Robert Victor Poirier
Принадлежит: Mobil Oil Corp
Реферат: A high density polyethylene (HDPE) film is provided having high biaxial orientation. The film includes HDPE having a density of at least 0.940, and a melt index of from 0.5 to 10. The film is stretched in the machine (longitudinal) direction to a degree of from 5:1 to 8:1, preferably from 6:1 to 7:1. The film is also stretched in the transverse (lateral) direction to a degree of from 6:1 to 15:1, preferably from 9:1 to 13:1. Preferably, the film has an orientation imbalance, with a higher degree of transverse orientation than machine orientation. Skin layers such as heat seal layers can be provided. Preferably, the film contains one or more layers of a casting promoter material employed to promote casting of a high gauge HDPE sheet subsequently high biaxially oriented to provide the film. The film can also be cavitated, or otherwise modified (e.g., corona-treated, coated, metallized, etc.) to provide films suitable for special applications. The film of the invention has superior properties, including lower water vapor transmission rate, better dead-fold, higher tensile strength, and consistent gauge profile. Also provided is a method for making the biaxially oriented film.
High density polyethylene film with high biaxial orientation
Номер патента: WO1998014491A1. Автор: Robert Victor Poirier,John Alan Larter. Владелец: Mobil Oil Corporation. Дата публикации: 1998-04-09.