Package formed from pattern laminated double wall hot formable plastic webs with enhanced puncture resistance
The present disclosure is concerned with packages formed from thermoformable webs with improved puncture resistance suitable for use in semi-automatic horizontal form fill and seal (HFFS) packaging machines and a process for packaging hard food items with sharp angular surfaces using such webs in such machines. The webs have a double wall partially laminated structure. The structure is conveniently formed by adhesively laminating two component films in a face to face configuration using a pattern of adhesive which leaves a substantial portion of the two facing surfaces unlaminated. The lamination just needs to be sufficient that the two component films will hot form together when they are vacuum drawn into a die to form a cavity for packaging the food items. The lamination pattern can vary from just edge strips to the edge strips and a honey comb pattern or a pattern of dots over the facing surfaces between the edge strips.
1. A package comprising:
a vacuum drawn cavity formed from a double wall partially laminated heat formable web comprising two independently manufactured thermoplastic films, the two films being partially laminated to each other such that less than 50% of the surfaces of the two films that face each other are laminated together; and
wherein one of the films has a surface which does not face the other film and is heat sealable.
2. The package of claim 1 , wherein the web further comprises an adhesive joining the two films that face each other together.
3. The package of claim 2 , wherein the adhesive is present n a repeating pattern.
4. The package of claim 1 , wherein said pattern is a honeycomb or spaced apart circles.
5. The package of claim 1 , herein each of the films comprises at least two layer of nylon.
6. The package of claim 5 , wherein at east one of the films comprises three layers of nylon.
7. The package of claim 6 , wherein each of the films comprises a layer of ethylene vinyl alcohol between the layers of nylon.
8. The package of claim 1 , wherein the two films being partially laminated to each other such that less than 25% of the surfaces of the two films that face each other are laminated together.
9. The package of claim 1 , wherein the cavity has a draw depth of at least 2 inch.
10. The package of claim 9 , wherein the cavity has a draw depth of at least 3 inch.