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US 3,942,299 AGranted
Packaging method
AssigneeGatrun Anstalt
InventorJacques Bory
Life of this patent
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Abstract
A method and apparatus for packaging products such as foodstuffs in which containers are made by heat deforming a band of thermoplastic material in which the band is deformed, the containers are filled, and a metallic cover coated with a thermoplastic material is secured to the filled container in a pressurised environment for example, in the presence of superheated dried steam. The containers are cooled in a connected chamber prior to leaving a housing in which the environment is produced and cutting of the containers from the band and one another.
Claims9
A method of packaging products comprising the steps of:
- establishing and maintaining an environment of substantial superatmospheric pressure;
- forming connected containers by heating and deforming successive portions of a plastic band;
- directing said connected containers through said environment;
- feeding a product, under pressure at least equal to that of said environment into said containers in said environment;
- feeding a band of metallic cover material, coated with a thermoplastic into said environment in covering relation to said containers and sealing the same thereto;
- heating said product to its sterilization temperature while maintaining said pressure at a value to prevent boiling of said product and holding said product at said temperature and pressure for a sufficient time to effect complete sterilization;
- and
- removing said sealed containers from said environment to an ambient environment and severing said containers from said bands.
5 more elements
Dependencies are inferred from the claim text.