Sidewall blank for substantially eliminating twist in deep bottom containers

Abstract

A cup forming sidewall blank includes a piece of flexible sheet material having an upper edge, a lower edge, and a pair of opposite side edges with an area at or adjacent the lower edge of the sidewall blank being provided with relief formations which extend generally upwardly and perpendicularly relative to the lower edge. The relief formations preferably take the form of score lines, slits, notches or other suitable constructions which are generally spaced from one another and are of equal length relative to the sidewall blank lower edge.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application relates to and claims priority of U.S. Provisional Patent Application Ser. No. 61 / 376,001, filed Aug. 23, 2010.FIELD OF THE INVENTION[0002]The present disclosure relates to the manufacture of two piece, seamed paper cups coated with thermoplastic, and more particularly, pertains to the manufacture of cups having a deep bottom formation.BACKGROUND OF THE INVENTION[0003]The assignee of the instant application, Paper Machinery Corporation of Milwaukee, Wis., USA, is the manufacturer of paper cup making machines used to make to a variety of cups and containers. A typical cup machine for making paper cups, for instance, includes a turret having a plurality of mandrels about which the containers are formed. The turret sequentially rotates the mandrels into cooperation with a variety of workstations where numerous cup forming procedures occur.[0004]In an exemplary procedure, a circular bottom blank is cutout at one worksta...

AI Technical Summary

Benefits of technology

[0007]The present disclosure relates to a two piece cup formed by a sidewall blank having an upper edge, a lower edge, a pair of opposite side edges, a front surface and a back surface with the opposite side edges overlapped and sealed along an overlapped side seam to a bottom blank along a lower edge of the sidewall blank. The invention is improved wherein an area at or adjacent the lower edge of the sidewall blank is provided with relief formations which extend generally upwardly and perpendicularly relative to the lower edge. The relief formations preferably take the form of score lines, slits, notches or other suitable constructions which are generally equally spaced from one another and are of equal length relative to the sidewall blank lower edge.

Problems solved by technology

Traditionally, the external peripheral surface of the deep bottom formation on the cup results in an undesirable twist or wrinkle effect (as depicted at T in the cup C of FIG. 1) which detracts from the appearance of the cup and can result in potential leakage problems.

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