Importance

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Abstract

This invention relates to the vacuum packaging of products and involves the use of a heat sealable thermoplastic bag in conjunction with a vacuum dome having a sealing edge disposed around its periphery and being connected to a source of vacuum, the thermoplastic bag being entirely closed except for an integral flat vent passage disposed at one peripheral location on the bag. One half of the vent passage is made up of material from one portion of the bag, and the other half of the vent passage is made up of a precisely equal amount of material from an opposite portion of the bag, such that the interior surfaces of said vent passage can tend to adhere together. The novel method in accordance with this invention comprises the steps of placing the thermopalstic bag in a supportive device having a desired configuration, placing the vacuum dome over the vent passage so the vent passage protrudes into the interior of the vacuum dome, with the peripheral edge of the dome in contact with bag portions surrounding the vent passage, reducing the pressure inside the dome so as to cause the egress of air from the interior of the bag out through the vent passage, thereafter removing the dome from contact with the bag, with the sidewalls of the vent member sealing together temporarily, and then taking the final step of heat sealing the opening of the vent passage to effectively prevent the return of air to the interior of the bag.

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First Claim