Method and apparatus for water-proofing edges of blanks

Details Method and apparatus for water-proofing edges of blanks Method and apparatus for water-proofing edges of blanks

B - Operations, Transporting

31

F

B31F 7/00 (2006.01) B29C 65/00 (2006.01) B31B 1/74 (2006.01)

Patent

CA 2183405

A skiving method comprises forming by milling, along an edge zone of a packaging blank (1-3) comprised of a liquid-absorbent layer (1) and at least two liquid-barrier layers (2 and 3) thereon, a tongue (8), a recess (6) inwardly of the tongue (8), a land (9) inwardly of the recess (6), and a groove (7) inwardly of the land (9), folding over the edge zone to insert the tongue (8) into the groove (7). and sealing the edge zone to the remainder of the sheet material, preferably by mechanical pressure alone.

Un procédé de drayage consiste à réaliser par calandrage, le long de la zone de bordure d'une ébauche d'emballage (1-3) constituée d'une couche (1) absorbant les liquides en sandwich entre au moins deux couches (2, 3) constituant une barrière à liquide, une languette (8), une encoche (6) à l'intérieur de la languette (8), un talon (9) à l'intérieur de l'encoche (6) et une rainure (7) à l'intérieur du talon. Le procédé consiste ensuite à replier la zone de bordure pour introduire la languette (8) dans la rainure (7), et à étanchéifier la zone de bordure contre le restant du matériau en feuille, de préférence uniquement par pression mécanique.

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