Method for folding sheet-shaped plastic material and folded shee

Details Method for folding sheet-shaped plastic material and folded shee Method for folding sheet-shaped plastic material and folded shee

1977-09-19

1980-01-15

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

264156, 264163, 264284, 264293, 264295, B28B 148

Patent

active

041838912

ABSTRACT:
Method for forming a folded sheet of plastic with reinforcing ribs disposed transverse to the line of fold. The line of fold or weakening line is provided with a plurality of weakening grooves separated by unweakened material of the sheet. When the sheet is folded, unweakened material is drawn out to form reinforcing ribs transverse to the weakening line and in the dihedral angle of the fold. The length of the unweakened material between the grooves is dimensionally variable to provide an adjustable resistance to folding.

REFERENCES:
patent: 3615149 (1971-10-01), Malone et al.
patent: 3950208 (1976-04-01), Pavak
patent: 4007538 (1977-02-01), Petrie
patent: 4064206 (1977-12-01), Seufert

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