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Author Question: You are rotomolding a large children's toy with a very complicated shape and you have trouble ... (Read 27 times)

lak

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on: Aug 19, 2018
You are rotomolding a large children's toy with a very complicated shape and you have trouble getting good part definition and complete molding. You have a choice of resins having two melt indices. One is 30 and the other is 2 . Which would you choose and why?
 
  What will be an ideal response?

Question 2

What is backdrilling of a vent hole and why is it done?
 
  What will be an ideal response?


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bob

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Reply #1 on: Aug 19, 2018
Answer to Question 1

The 30 because the higher melt index indicates the material's ability to flow, this increase in flow will allow for better part definition. Processing time will also be shorter by using the 30 rather than the 2.

Answer to Question 2

Backdrilling is cutting a larger hole behind the portion of the vent hole that touches the plastic sheet. This larger hole gives greater air flow and allows faster application of the vacuum.


lak

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Reply 2 on: Aug 19, 2018
Great answer, keep it coming :)

Joy Chen

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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