Film blank for packages

Details Film blank for packages Film blank for packages

1996-07-19

1998-04-21

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428155, 428212, 4285428, 220 62, B32B 328, B29B 700, B65D 2500

Patent

active

057415706

ABSTRACT:
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 T.sub.2 and zones (9) of lesser depth T.sub.1 alternating along its length. For ease of manufacture with close tolerances, smooth running and improved insensitivity to cracking the zones (9) of lesser depth T.sub.1, are bounded by circular arcs 10 of radius R at least 1.1 mm the center of curvature (M) of which lies on the other side a line (L) which connects the zones (8) of greater depth T.sub.2 together. Preferably, the zones (9) of lesser depth T.sub.1 merge with the zones (8) of greater depth T.sub.2 at an acute angle ".alpha." from 0.degree. to 60.degree., and the points (P') where the zones (8) of greater depth T.sub.2 and zones (9) of lesser depth T.sub.1 meet are rounded concavely.

REFERENCES:
patent: 4064206 (1977-12-01), Seufert
patent: 4586650 (1986-05-01), Sasaki et al.
patent: 5302435 (1994-04-01), Hashimoto

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