Back to results
US 12,528,280 B2Granted
Machine-direction oriented polymeric film and method of making the same
AssigneeBerry Global, Inc.
InventorsPaul Z. Wolak, Bryan S. Gillespie, Christopher E. King
Life of this patent
Estimating the term…
Abstract
A formulation and method for producing a multilayer film and a coated multilayer film comprising a barrier layer including a polar polymer resin, such as EVOH, as described.
Claims20
A method for preparing a machine direction oriented film, the method comprising the steps of
- extruding three or more extrudable materials through a die to form a molten extrudate,
- blowing the molten extrudate to establish a blown film,
- collapsing the blown film, such that a first interior surface of the blown film adheres to an adjacent second interior surface of the blown film, thereby forming a blocked film, and
- stretching the blocked film in a direction to provide a machine direction oriented film,
- wherein the machine direction oriented film comprises
- a first barrier layer arranged to provide a first outer surface, the first barrier layer comprising ethylene-vinyl alcohol copolymer (EVOH),
- a core layer, and
- a second barrier layer arranged to provide a second outer surface, the second barrier layer comprising EVOH.
5 more elements
A method for preparing a laminate, the method comprising the steps of:
- extruding three or more extrudable materials through a die to form a molten extrudate,
- blowing the molten extrudate to establish a blown film,
- collapsing the blown film, such that a first interior surface of the blown film adheres to an adjacent second interior surface of the blown film, thereby forming a blocked film,
- stretching the blocked film in a direction to provide a machine direction oriented film,
- wherein the machine direction oriented film comprises
- a first barrier layer arranged to provide a first outer surface, the first barrier layer comprising ethylene-vinyl alcohol copolymer (EVOH),
- a core layer,
- a second barrier layer arranged to provide a second outer surface, the second barrier layer comprising EVOH, and
- laminating the machine direction oriented film to provide a laminate, the laminate comprising the machine direction oriented film and a second film, wherein the second film is arranged to be in contact with the second barrier layer.
6 more elements
Dependencies are inferred from the claim text.