Food packaging film and manufacturing method for making the same
AssigneeViskase Companies, Inc.
InventorsMyron D. Nicholson, Dmytro Shoshyn
Life of this patent
Estimating the term…
Abstract
The present invention relates to a multilayer film, especially to a multilayer thermoplastic film, which may be used for food packaging, wherein the multilayer film according to the present invention may be provided, on its inner side, with a food additive, particularly with a flavoring and/or coloring and/or an aroma producing food additive (such as e.g. a liquid smoke), which food additive is then released and transferred onto the surface of a foodstuff encased in the multilayer film during cooking and/or processing of the foodstuff.
Claims22
A thermoplastic multilayer film to be used for food packaging, wherein the multilayer film comprises at least three polymeric layers and/or layer composites:
- (A) an inner layer composite, which inner layer composite is an inner food contacting layer composite, wherein the inner layer composite comprises a plurality of single inner layers attached and/or adhered to one another, wherein the single inner layers are each composed of at least one foamed polymer comprising at least one polyolefin and wherein the single inner layers each comprise a multitude of voids selected among open cells and pores and being capable of reversibly retaining and/or absorbing at least one food additive;
- wherein the inner layer composite comprises at least three single inner layers, wherein the various single inner layers, same or different and independently from one another, each comprise at least one polyolefinic polymer, copolymer, or terpolymer;
- (B) an outer layer composite, wherein the outer layer composite comprises a plurality of single outer layers attached and/or adhered to one another, wherein the single outer layers each comprise at least one polyamide;
- (C) an adhesive layer in the form of a tie layer disposed between the inner layer composite and the outer layer composite and adhered to the inner layer composite and the outer layer composite;
- wherein the thickness ratio [outer layer composite:inner layer composite:adhesive layer] is [55-75:25-45:1-10];
- wherein the multilayer film has a relative volume-based porosity, based on the overall volume of the multilayer film, in the range of from 15 to 70 Vol.-%, wherein the porosity of the multilayer film is provided by the multitude of voids comprised by the single inner layers of the inner layer composite;
- wherein the multilayer film has a relative weight-based loadability or absorption capacity with the respect to the at least one food additive, based on the overall dry weight of the multilayer film, in the range of from 10 wt. % to 150 wt. %;
- and
- wherein the multilayer film has a water vapor transmission rate in the range of from 5 to 500 g/m2/24 hours, as determined according to ASTM F1249-06.
Dependencies are inferred from the claim text.