Food sachet or container

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 75/30 (2006.01) B65D 75/58 (2006.01)

Patent

CA 2572695

A sachet (10) or food container is formed of two plastics (5) sheets (12) and (14) joined to one another around the edges of an internal pocket (20) of the sachet or container by welded seals. The compositions the two plastics sheets (12) and (14) differ one from the other and are selected such that the strength of the seals is controllable by varying at least (10) one welding parameter selected from temperature, pressure and dwell time. The two sheets (12) and (14) are welded to one another using a first set of welding parameters to produce strong seals in some of the seam regions (22) bounding the internal pocket, while other seam regions (24) bounding the (15) pocket are welded using a second set of welding parameters to produce weak seals at which the sachet will burst open preferentially when the pocket is pressurised.

La présente invention a trait à un sachet (10) ou emballage d'aliments constitué de deux feuilles (12, 14) de matière plastique (5) assemblées autour des bords d'une poche intérieure (20) du sachet ou de l'emballage par des joints de soudure. Les compositions des deux feuilles de matière plastique (12, 14) sont différentes l'une de l'autre et sont choisies de sorte que la solidité des joints est contrôlable par la variation d'au moins (10) un paramètre de soudage choisi parmi la température, la pression et le temps de séjour. Les deux feuilles (12, 14) sont soudées l'une à l'autre avec un premier ensemble de paramètres de soudage pour produire des joints solides dans certaines des zones soudure (22) délimitant la poche intérieure, tandis que les autres zones de soudure (24) délimitant la poche (15) sont soudées avec un deuxième ensemble de paramètres pour produire des joints peu solides au niveau desquels le sachet va craquer de préférence lors de la mise sous pression de la poche.

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