Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – And with bending
Patent
1986-06-30
1987-11-24
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
With cutting, breaking, tearing, or abrading
And with bending
493 60, 493134, 493144, 493287, 493362, 409138, B31B 114, B31B 364, B31B 4300
Patent
active
047087080
ABSTRACT:
A method and apparatus are disclosed for skiving and hemming one or more edges of a paperboard web or blank to improve the sealing qualities of a container made from the paperboard. The paperboard is skived twice generally parallel to its edge, once to define an oblique surface and once to make a flat skived surface. The latter is folded over the former and heat-sealed to a heat sealable material adjacent the skived region, defining a wedge-shaped edge portion. The folded over part is preferably ironed to produce a substantially flat sheet, and the wedge-shaped edge is preferably reshaped at some point in the process to make the entire folded over surface substantially flush with the unskived surface to which it is sealed. The flat skived surface is preferably made by a milling procedure in which the milling teeth strike the material while moving in a direction opposite to that of the motion of the material.
REFERENCES:
patent: 3058868 (1962-10-01), Schroeder
patent: 3074327 (1963-01-01), Grahn
patent: 3432375 (1969-03-01), Rein
patent: 3495507 (1970-02-01), Haas et al.
patent: 3604317 (1971-07-01), Baun
patent: 3654842 (1972-04-01), Schwenk
patent: 3716435 (1973-02-01), Jensen et al.
International Paper Company
Schmidt Frederick R.
Terrell William E.
Zielinski Walt Thomas
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