Molded Fiber Tub with Projections for Consumer Product Packaging

The patent changes the material parameter from conventional thermoformed plastic to molded fiber material, maintaining the molding process capability while achieving environmental benefits. The fiber tub can be molded using similar high-speed processes but is biodegradable and made from renewable resources, thus resolving the contradiction between productivity and environmental friendliness.

The patent applies curved or rounded corner designs to the fiber tub geometry, which eliminates sharp corners that would require complex draft angles during molding. The curved transitions allow fiber material to flow smoothly during the molding process, reducing manufacturing complexity while maintaining the environmental benefits of fiber materials.

The patent incorporates preliminary anti-sticking features in the tub design, such as release coatings or surface treatments applied during molding, that prevent the trays from adhering to each other during stacking. This preliminary prevention of the sticking problem allows multiple draft angles to be used for design flexibility while maintaining ease of automated feeding and denesting.

The patent incorporates self-positioning features directly into the tub structure, such as integrated recesses, protrusions, or alignment pins that automatically guide the tub into correct position during assembly. This self-service positioning mechanism maintains ease of manufacture while achieving high assembly precision without requiring additional complex assembly equipment or procedures.