International Paper Company

Joe L Kinsey

Charles E Gibbons

Allan A Whillock

Robert L Lanham

Kenneth E Paulhamus

William F Muller

The present invention relates to an improved composite barrier laminate for an improved container for citrus juices and other liquids. The container utilizes a paperboard barrier laminate for the containment of essential oils and the prevention of losses of vitamin C. The laminate makes use of an inner barrier layer of a heat-sealable oxygen and flavor oil barrier material to enhance the barrier properties of the laminate as well as an extremely thin low density polyethylene food contact layer to provide a resultant secure homogenous non-polar heat seal.

Composite polyethylene barrier structure

The present invention relates to an improved container for citrus juices and other liquids. The container utilizes a paperboard barrier laminate for the containment of essential oils and flavors. Also disclosed is a process of making the laminate. The laminate makes use of a layer of a heat-sealable polycarbonate polymer food contact layer to enhance the barrier properties of the laminate.

Flavor/aroma polycarbonate barrier laminates for paperboard cartons

A method and an apparatus for testing the adhesion between the polyethylene coating and paperboard stock of polyethylene coated paperboard stock, such stock typically used in forming milk and fruit juice cartons. A normally open ended pressure chamber is closed by clamping a piece of polyethylene coated paperboard over its open end. The coating facing the pressure chamber is cut completely through to form an opening. Air of a predetermined value is introduced into the pressure chamber. The opposite coating will form a bubble, indicating delamination, if the integrity of the adhesion between the polyethylene coating and the paperboard is poor. The air pressure at which delamination occurs is then used to quantify adhesion.

Polyethylene coating adhesion testing

The present invention relates to an improved container for citrus juices and other liquids. The container utilizes a paperboard barrier laminate for the containment of essential oils and the prevention of losses of Vitamin C. Also disclosed is a process of making the laminate. The laminate makes use of a layer of a heat-sealable glycol-modified polyethylene terephthalate to enhance the barrier properties of the laminate.

Growing community of inventors

Mobile, AL, United States of America

Joe L Kinsey