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What are "thin or thick" of injection molded parts?

Not just the specifics of thermodynamics, but also a more fundamental one of Mankind (sorry, Personkind!) collectively learning from experience and recording that experience. Often, that condensed experience will end up in... that right, TEXTBOOKS. Should we all spend our time reinventing the wheel? I do despair when I read assertions that it's pointless searching for explanations to phenomena that are ill-understood by some (however "experienced") but offer little or no mystery to others that have taken the trouble to study fundamental truths or the result of intense study by others who managed to explain rationally what others had perceived as "black art".

The reduction of wall section should always be a "given" in any half-decent designer's approach to designing a component. Sometimes, however, the thinnest wall section that can be contemplated to fulfill key requirements are still what most would call "thick." I'm dealing with components at the moment (not injection molded, but thermoplastic) that are needed to withstand 40 tones short-term loading. Some ABS injection moldings I was aware of in the '80s were around 25mm thick (spin-welded fishing net flotation spheres) and — I am told — some modern fighter jet cockpit canopies are injection molded in polycarbonate at around 65mm!

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