Importance

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Abstract

A method is disclosed for substantially removing surface defects that are attendant with plastic blanks formed by cutting out squares from sheet stock material that are subsequently forged by means of non-melt, high pressure or solid-phase forming of preforms and thereafter thermoforming said preforms into containers. The blank itself comprises a tabular body having a pair of major faces located substantially parallel to one another, minor faces integrally formed and extending outwardly from said major faces, said minor faces presenting a smooth surface commensurate to that of said major faces, and a vertical portion integrally formed with said minor faces and defining an outer peripheral band or line having an unsmooth surface. A method of forming said plastic blank comprises providing a sheet of polymeric material, pressing lines of demarkation upon said sheet, severing said sheet within said lines to separate and cut said sheet into individual blank, whereby each blank is formed having a smooth surface provided by said pressing step and a rough surface provided by said severing step, thereafter forging said blank to a predetermined preform and reforming said preform to a container free of any imperfection.

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First Claim