Method of producing a rigid paperboard container

Details Method of producing a rigid paperboard container Method of producing a rigid paperboard container

1986-06-03

1988-01-26

Olszewski, Robert P.

Manufacturing container or tube from paper; or other manufacturi

Container making

Rigid container

493154, 493167, 493339, 264324, B31B 128

Patent

active

047214996

ABSTRACT:
A method of forming a container from a flat, substantially homogeneous blank of fibrous substrate, comprising the steps of shaping the blank into a formed container having a bottom wall, an up-turned side wall extending from the bottom wall, a rim outwardly extending from the side wall and a lip downwardly curving from the rim and including a plurality of radially-extending, circumferentially-spaced pleats formed in the side wall, rim, and lip, each pleat including at least three layers of the blank; and applying sufficient heat and pressure to the side wall and rim to decrease the thickness thereof to less than that of the blank and to transform each pleat into a substantially integrated fibrous structure in which the constituent layers generally lack individual identity, each structure having a density greater than and a thickness substantially equal to adjacent areas of the side wall and rim.

REFERENCES:
patent: 448748 (1891-03-01), Comings
patent: 1006722 (1911-10-01), Claussen et al.
patent: 1716554 (1929-06-01), Hoff
patent: 4149841 (1979-04-01), Patterson

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