Process for making a trapezoidally-shaped opening in a thermofor

Details Process for making a trapezoidally-shaped opening in a thermofor Process for making a trapezoidally-shaped opening in a thermofor

1994-07-11

1995-12-12

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

264163, 264322, B29C 4340, B29C 5132

Patent

active

054747287

ABSTRACT:
The invention relates to a mold apparatus and a process for forming a lid latching mechanism in a thermoplastic container. The lid latching mechanism features a large, trapezoidally-shaped opening hole. The trapezoidal shape has been found to reduce the amount of tearing that can occur along the edges of an opening formed during the thermoforming process. The opening is created by the engagement between a fixed shear key mounted in a first mold member and a movable shear key which has a trapezoidally-shaped cutting surface and is mounted in a second mold member. The movable key travels along an inclined path as the mold members close on a preheated thermoplastic sheet to form a container.

REFERENCES:
patent: 4155692 (1979-02-01), Kermoian
patent: 4446088 (1984-05-01), Daines
patent: 4909721 (1990-03-01), Warburton
patent: 5162123 (1992-11-01), Grimes

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