Liquid-trapping bag and method of making it

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 33/00 (2006.01)

Patent

CA 2517808

A bag for use in vacuum packaging comprises a first and second overlapping panels. A plurality of channels having a plurality of baffles is formed on one or more of the panels for evacuating air or other gases from inside the bag using suction, while preventing liquids from being drawn inside it. In one embodiment, the forming of a bag involves between cooling and laminating rolls includes feeding a gas-impermeable material to a nip between the rolls. Resin is extruded to the nip so that it fills a plurality of cavities of the cooling roll, forming an inner layer that adheres to the gas-impermeable material. The resultant sheet is folded to form the first and second panels and they are sealed to from an envelope.

Une poche utilisée pour les emballages sous vides comprend un premier et un second panneaux se recouvrant. Sur l'un des panneaux ou plus est formée une pluralité de canaux comportant une pluralité de chicanes servant à l'évacuation par aspiration de l'air ou d'autres gaz de l'intérieur de la poche, tout en empêchant des liquides d'être aspirés à l'intérieur. Dans un mode de réalisation, l'invention concerne un procédé de fabrication d'un tel sac consistant à introduire un matériau imperméable aux gaz dans l'espace entre un rouleau de refroidissement et un rouleau de laminage. De la résine est extrudée dans l'écartement entre rouleaux se telle sorte qu'elle remplisse une pluralité de cavités dans le rouleau de refroidissement et forme une couche intérieure qui adhère sur le matériau imperméable aux gaz. La feuille ainsi obtenue est repliée pour former un premier et un second panneau, puis scellée pour former une poche.

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