Film blank for packages

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 5/42 (2006.01) B31B 1/25 (2006.01)

Patent

CA 2180774

A film blank for packages, especially for folding boxes, has impressed fold lines (BL) in the form of groove-like depressions (5), which extend from a film upper face (3) and at the base of the depressions (5) are closed off from the other film face (4). The base of the depressions (5) has zones (8) of greater depth T2 and zones (9) of lesser depth T1 alternating along its length. For ease of manufacture with close tolerances, smooth running and improved insensitivity to cracking the zones (9) of lesser depth T1, are bounded by circular arcs 10 of radius R at least 1.1mm the centre of curvature (M) of which lies on the other side a line (L) which connects the zones (8) of greater depth T2 together. Preferably, the zones (9) of lesser depth T1 merge with the zones (8) of greater depth T2 at an acute angle ".alpha." from 0° to 60°, and the points (P') where the zones (8) of greater depth T2 and zones (9) of lesser depth T1 meet are rounded concavely.

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