Easy open heat-shrinkable packaging
AssigneeCurwood, Inc.
InventorsDavid A. Busche, Gregory Robert Pockat, Thomas Andrew Schell
Life of this patent
Estimating the term…
Abstract
An easy opening heat-shrinkable bag adapted to be heat sealed to a closed condition to contain and protect a product disposed therein, whereby, at least one heat seal is peelable and readily openable by application of force.
Claims69
An individual, end-sealed packaging bag formed from a sheet of a heat-shrinkable film, said sheet of a heat-shrinkable film having a first side, an opposing second side, an inner surface and an outer surface, said bag comprising:
- a first seal connecting said first side to said second side and defining a tube member having a first bag wall, a second bag wall, opposing first and second bag edges, an end and an open mouth opposite said end;
- a second seal provided through said first and second bag walls, said second seal extending laterally across the width of both said first and second bag walls at a position proximate said end, whereby an empty product receiving chamber is defined by said first bag wall, said second bag wall, said second seal and said open mouth;
- and,
- wherein at least one of said first and second seals comprising a peelable seal.
An end-sealed packaging bag formed from a sheet of a heat-shrinkable film, said film having a first side and an opposing second side, said bag comprising:
- a first seal bonding said first side and said second side along the lengths thereof thereby defining a tube member having a first bag wall, a second bag wall, opposing first and second bag edges, an end and an open mouth, said first seal comprising a lap seal and being peelable;
- a second seal provided through said first and second walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end;
- and,
- a product receiving chamber defined by said first wall, said second wall, said second seal and said open mouth.
A method of forming an end-sealed, heat-shrinkable packaging bag having at least one peelable seal from a flat sheet of film comprising:
- (a) providing a sheet of heat-shrinkable thermoplastic film having a first side and an opposed second side;
- (b) providing a first seal between said first and second sides to form a tube member, said tube member having a first bag wall, a second bag wall, a bottom and an open mouth;
- and,
- (c) providing a second seal through said first and second bag walls, said second seal extending laterally across said tube member at a position approximate said bottom;
- wherein at least one of said first and second seals comprise a peelable seal.
A method of forming a heat-shrinkable bag comprising the steps of:
- (a) coextruding a primary film tube;
- (b) biaxially stretching said film tube to provide a heat-shrinkable film tube stock;
- (c) slitting said tube stock to form a continuous flat sheet of film;
- (d) slitting said continuous flat sheet of film longitudinally to form a desired-width bag film;
- said desired-width bag film having a first side and an opposing second side;
- (e) providing a first seal between said first and second sides to form a tube member having a first bag wall, a second bag wall and a product receiving chamber defined between said first and second bag walls, said first seal comprising a peelable seal;
- (f) providing a second seal between said first and second walls, said second seal extending laterally across the width of said tube member and being a permanent seal;
- and
- (g) providing a cut through said tube member, said cut extending laterally across the width of said tube member and separating a portion of said tube member containing said lateral seal from said tube member.
An end-sealed packaging bag formed from a sheet of a heat-shrinkable film, said film having a first side, an opposing second side, an inner surface and an outer surface, said bag comprising:
- a first seal joining said first side and said second side along the lengths thereof and defining a tube member having a first bag wall, a second bag wall, opposing first and second bag edges, an end and an open mouth, said first seal comprising a lap seal and being peelable;
- a second seal provided through said first and second walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end;
- and,
- a product receiving chamber defined by said first wall, said second wall, said second seal and said open mouth.
Dependencies are inferred from the claim text.