초록 ▼

In a vacuum-sealing method and apparatus for various articles to be packed under vacuum, the improvement consisting in that a hot-air circulating closed-loop path is provided within the vacuum-packaging enclosure, so as to have hot air circulating unidirectionally in order to sweep the package virtu

In a vacuum-sealing method and apparatus for various articles to be packed under vacuum, the improvement consisting in that a hot-air circulating closed-loop path is provided within the vacuum-packaging enclosure, so as to have hot air circulating unidirectionally in order to sweep the package virtually concurrently with the evacuation and autogenous welding stage. A swingable flap valve inserted in the hot-air path upstream of the specially provided heating means ensures such a unidirectional hot air flow. By so doing, the vacuum-packing operations can be more efficiently and quickly completed. The package wrappers are made of a thermoplastics, heat-shrinkable material.

대표청구항 ▼

A method for packaging under vacuum a product inside a bag comprising the following steps: (a) arranging the bag made of heat-sealable material containing the product inside a treatment chamber that can be closed in an airtight manner; (b) closing said treatment chamber; (c) causing preheated hot ai

A method for packaging under vacuum a product inside a bag comprising the following steps: (a) arranging the bag made of heat-sealable material containing the product inside a treatment chamber that can be closed in an airtight manner; (b) closing said treatment chamber; (c) causing preheated hot air to circulate in said chamber under forced draft, said air being heated by means in said chamber; (d) evacuating said hot air to outside the chamber and thus outside the bag so as to create an environment under vacuum; (e) sealing the aperture of the bag; (f) re-establishing pressure in the treatment chamber by the introduction of outside air over the heating means thereby heating the introduced air; and (g) opening the chamber and removing the vacuum-packaged pack obtained.