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US 8,617,673 B1Granted
Thermoformable heat-sealable PET sheet material
AssigneePlacon Corporation
InventorsNirav N. Desai, Lewis Daniel Lee
Life of this patent
Estimating the term…
Abstract
A sheet for thermoforming is comprised of a material which is compatible with PET and which has slower crystallinity and a crystallization temperature which is at least 77° C. greater than its glass transition temperature, more preferably a crystallization temperature greater than 151° C. The material may be coextruded into a sheet with a first PET material, such that when thermoformed into a formed part the layers of second material are engaged with each other in the molded parts and for being subjected to heat sealing.
Claims8
A thermoformable sheet material comprising:
- a first layer formed of amorphous PET or amorphous RPET material;
- and
- a second layer of a second material comprised of a PET resin having a crystallization temperature which is at least about 77° C. greater than its glass transition temperature, wherein the sheet material is thermoformed to define a first sheet part which is welded to a second sheet part to define a container.
A thermoformable sheet material comprising:
- a first layer formed of amorphous PET or amorphous RPET material;
- and
- a second layer of a second material comprised of a PET resin having a crystallization temperature which is at least about 77° C. greater than its glass transition temperature, wherein the sheet stock is thermoformed into a first element and a second element, and the thermoformed first element and the thermoformed second element are brought together such that the second layers of the second material are in engagement with each other and are welded together to thereby seal the first element to the second element.
Dependencies are inferred from the claim text.