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.

Abstract: In a folding box consisting of a cardboard blank part (1) and a plastic foil blank part (3) glued thereto, thinned-down areas (17) are placed in the foil blank part (3) at the overlap spots between the two blank parts in the area of the box edges, which directly adjoin the bend lines (13) and extend at least across the overlap length. The thinned-down areas (17) compensate stresses arising in the foil material at the overlap spots during folding, this compensation being by deformation, without which the cardboard material is stretched at the edge overlap spots so that it tears.

Abstract: An edge forming tool is pressed into a thermoplastic sheet which is supported on an anvil or counter tool. The edge forming tool is maintained at a temperature below the melting temperature of the thermoplastic sheet and a high frequency electric field is established between the edge forming tool and the counter tool. The high frequency electric field softens the thermoplastic sheet which is deformed by the edge forming tool. Thereafter, the softened and deformed portions of the thermoplastic sheet are allowed to cool and re-harden before the sheet is folded to form a bend therein.

Abstract: An edge forming tool is pressed into a thermoplastic sheet which is supported on an anvil or counter tool. The edge forming tool is maintained at a temperature below the melting temperature of the thermoplastic sheet and a high frequency electric field is established between the edge forming tool and the counter tool. The high frequency electric field softens the thermoplastic sheet which is deformed by the edge forming tool. Thereafter, the softened and deformed portions of the thermoplastic sheet are allowed to cool and re-harden before the sheet is folded to form a bend therein.

Abstract: An edge forming tool is pressed into a thermoplastic sheet which is supported on an anvil or counter tool. The edge forming tool is maintained at a temperature below the melting temperature of the thermoplastic sheet and a high frequency electric field is established between the edge forming tool and the counter tool. The high frequency electric field softens the thermoplastic sheet which is deformed by the edge forming tool, Thereafter, the softened and deformed portions of the thermoplastic sheet are allowed to cool and re-harden before the sheet is folded to form a bend therein.