Process for making a trapezoidally-shaped opening in a...

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

B - Operations, Transporting

29

C

B29C 51/32 (2006.01) B29C 51/00 (2006.01) B65D 1/22 (2006.01) B65D 85/32 (2006.01)

Patent

CA 2153535

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.

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