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Plastic Lid Design

Plastic Lid Design

Plastic Lid Design

(OP)
Guys,

    I am designing a small container, ~ 4" x 2" x 1.5" that can hold liquid without leaking out.  This device basically consists of a base that has a lip around the perimeter and a cover which fits over that lip making a tight seal (think of a typical plastic tote you use around the house).  Before the product goes into production (injection molding) we want to ensure that the seal remains tight throughout the products use (~2 week disposable).  I've found plenty of documentation on press fit designs with plastic but they typically talk about a shaft in a hole.  One advantage I have is that we have prototypes made of a SLA resin, but the question is how can I ensure the design is good before spending big money on tooling.  

Some of the things I'm interested in:

1.  What material properties play into the lid/base fit design?
          Flexural modulus, flexural strength, creep resistance....

2.  What's the best way to estimate the force required to make the interference

Any guidance would be appreciated.

Thanks,
Pete

RE: Plastic Lid Design

Best advice I can give:  Reverse-engineer similar stuff from Tupperware and Rubbermaid.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Plastic Lid Design

And no matter what you do, it will come out of the dishwasher all warped and never seal again. winky smile

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