Food or edible material: processes – compositions – and products – Packaged or wrapped product – Having destructive type opening along scored or perforated line
Reexamination Certificate
1999-08-12
2001-11-06
Bhat, Nina (Department: 1761)
Food or edible material: processes, compositions, and products
Packaged or wrapped product
Having destructive type opening along scored or perforated line
C426S124000, C426S127000, C426S130000, C426S410000, C383S111000, C383S209000
Reexamination Certificate
active
06312742
ABSTRACT:
The applicants claim foreign priority benefits under 35 USC 119 of New Zealand Patent Application No. 314258 having a filing date of Feb. 17, 1997, New Nealand Patent Application No. 328291 having a filing date of Jul. 9, 1997, and New Zealand Patent Application No. 329346 having a filing date of Dec. 5, 1997.
FIELD OF THE INVENTION
The invention relates to packaging and in particular to multi-ply flexible packaging such as bag-in-bag packaging Systems. More particularly the invention is concerned with top closure systems for such flexible packaging formed from plastics material and having an inner bag contained within but separate from an outer bag. Such packaging is suitable for foodstuffs or food grade materials or pharmaceuticals.
BACKGROUND
There is a use for a flexible packaging which offers an outer packaging to act as a protective or industrial shipping packaging combined with A inner packaging which is removable from the outer packaging whilst remaining sealed. The removable inner packaging acts to provide a hygienically packed product that has not been contaminated during shipping and is suitable to be taken into critical food hygiene areas.
There is a need to provide a flexible packaging as described above which is readily manufactured and can provide a sealed bag-in-bag approach.
DEFINITIONS
Bag means a container made from one or more plies of a flexible material, closed at least at one end. It includes but is not limited to “sacks, bags, pouches, and sachets”, of any size or shape. Although size will vary from country to country, the term “sack” is often used for such containers capable of containing between 10 kg and 40 kg of product. “Bag” or “pouch” are sometimes used to refer to containers holding less than 10 kg of product. However in this specification “bag” is used in its generic sense irrespective of the weight of the product. In its most preferred form the specification describes a “bag-in-bg” packaging-system suitable for containing 25 kg of milk powder or milk powder derivatives; which in most countries would be referred to as a “sack”.
Sack means a bag made essentially from one or more flattened tubular plies of flexible material (such as paper or plastic) closed at least at one end.
Ply means a sheet of flexile material forming the walls of a bag (or sack). We use “two ply bag” to refer to a “bag-in-bag” packaging system, ie “inner ply” refers to a wall of the “inner bag”.
Film refers to a flexible material (typically a “plastics” material) whether it is made up of one layer or more than one layer of material.
OBJECT
It is an object of this invention to provide an improved package or an improved closure arrangement for a multi-ply flexible packaging or at least one that provides the public with a useful choice.
STATEMENT OF INVENTION
In one aspect the invention may broadly said to consist in an at least two ply bag comprising an inner ply contained within, but removable from, an outer ply, a mouth of the bag incorporating inner and outer sealing means, the inner sealing means adapting the inner ply only for sealing and the outer sealing means adapting at least the outer ply for sealing.
We use “two ply bag” to refer to a “bag-in-bag” packaging system, ie “inner ply” refers to a wall of the “inner bag”.
Preferably a frangible zone is provided between the inner sealing means and the outer sealing means at least in the outer ply.
More preferably the frangible zone is formed by a weakened line formed in the at least outer ply material.
More preferably the frangible zone is formed by a weakened line in both the inner ply material and the outer ply material.
Preferably the inner seal and the outer seal are achieved by the application of heat through the layers of the inner ply and the outer ply.
Optionally, a non-sealable layer may be provided between the inner ply and the outer ply about the inner sealing means of the inner ply, or alternatively the inner plies may be sealed but the outer ply not sealed by suitable choice of time-temperature/pressure and materials.
Preferably the non-heat sealable layer is chosen from the group including but not limited to: solvent based varnish lacquers, water based solvent lacquers, and silicone disperions.
Preferably the at least inner ply is fabricated from weldable plastics material.
More preferably, the weldable plastics material is thermoplastic or composites of thermoplastics and other materials including, but not limited to: polyethylene coated paper and polyethylene coated woven polypropylene.
In another aspect the invention may broadly be said to consist in a method of sealing an at least two ply bag comprising an inner ply contained within, but removable from, an outer ply, a mouth of the bag incorporating inner and outer sewing means, the inner sealing means adapting the inner ply only for sealing and the outer sealing means adapting at least the outer ply for sealing.
Preferably a frangible zone is provided between the inner sealing means and the outer sealing means at least in the outer ply.
More preferably the frangible zone is formed by a weakened line formed in the at least outer ply material.
More preferably the frangible zone is formed by a weakened line in both the inner ply material and the outer ply material.
Preferably the inner seal and the outer seal are achieved by the application of heat through the layers of the inner ply and the outer ply, a non-sealable layer being provided between the inner ply and the outer ply about the inner sealing means of the inner ply.
Preferably the non-heat sealable layer is chosen from the group including but not limited to: solvent based varnish lacquers, water based solvent lacquers, and silicone dispersions.
Preferably the at least inner ply is fabricated from weldable plastics material.
More preferably, the weldable plastics material is thermoplastic or composites of thermoplastics and other materials including, but not limited to, polyethylene coated paper and polyethylene coated woven polypropylene.
In another aspect the invention may broadly be said to consist in a multi-ply bag having an inner ply and an outer ply constructed from heat sealable material, the inner ply being contained within, but removable from, the outer ply, wherein a strip of non-heat sealable material is applied on the inside of the outer ply or the outside of the inner ply near or adjacent to an open end of the outer ply or inner ply.
Preferably the non-heat sealable material is applied on the inside of the outer ply.
Preferably the non-heat sealable layer is chosen from the group including but not limited to: solvent based varnish lacquers, water based solvent lacquers, and silicone dispersions.
Preferably, a frangible zone is provided in the at least outer ply material, in the region of the non-heat sealable material or above the non-heat sealable material.
More preferably, the frangible zone is provided in the region of the non-heat sealable material.
Preferably the frangible zone is provided by a weakened line formed in the at least outer ply material.
In a further aspect, the invention may broadly be said to consist in a method for sealing an at last two ply bag constructed from heat sealable material, having an inner ply contained within, but removable from, an outer ply, wherein a strip of non-heat sealable material is applied on the inside of the outer ply or the outside of the inner ply near or adjacent to an open end of the outer ply or inner ply.
Preferably the non-heat sealable material is applied on the inside of the outer ply.
Preferably the non-heat sealable layer is chosen from the group including but not limited to: solvent based varnish lacquers, water based solvent lacquers, and silicone dispersions.
Preferably, a frangible zone is provided in the at least outer ply material, in the region of the non-heat sealable material or above the non-heat sealable material.
More preferably, the frangible zone is provided in the region of the non-heat sealable material.
Preferably the frangible zone is provided by a weakened line formed in the at least outer ply material.
Prefer
Bourne Anthony
Kohn Uwe
Wood Alexander Charles
Bhat Nina
Cryovac Inc.
Quatt Mark B.
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