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1. (WO2018160645) FORMED THERMOPLASTIC ARTICLE HAVING SMOOTH EDGES AND, OPTIONALLY, A PEELABLE SURFACE

Pub. No.:    WO/2018/160645    International Application No.:    PCT/US2018/020137
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Thu Mar 01 00:59:59 CET 2018
IPC: B29C 51/14
B29C 51/30
B65D 1/36
Applicants: CONVERTER MANUFACTURING, LLC
Inventors: WALLACE, Millard, F.
Title: FORMED THERMOPLASTIC ARTICLE HAVING SMOOTH EDGES AND, OPTIONALLY, A PEELABLE SURFACE
Abstract:
The disclosure relates to forming shaped thermoplastic articles having smooth peripheries. Many thermoplastic articles have sharp edges formed upon molding or cutting the article from a feedstock sheet (e.g. following thermoforming). Such sharp edges can damage thin plastic films or flesh which they contact, and smoothing the edges is desirable. Described herein are methods of forming a smooth periphery for such sharp-edged articles by rolling over the sharp edge. The smoothing operation is performed by forming a deflectable flange including a bend region separated from the potentially sharp peripheral edge by a spacer, deflecting a portion of the deflectable flange, and softening at least one bent portion of the deflectable flange to yield a smooth periphery upon cooling. A liner sheet may be attached to the feedstock sheet prior to, during, or after forming and can be peelable therefrom.