Author Question: You have noticed that when removed from the mold, your football tends to collapse on one side. Give ... (Read 26 times)

Starlight · **on:** Aug 19, 2018

You have noticed that when removed from the mold, your football tends to collapse on one side. Give two possible causes, and solutions.

What will be an ideal response?

Question 2

You have been asked to troubleshoot an extrusion plant. Recently the material specification was changed for a part, and now the plant manager says he can't meet his quotas, because the material won't extrude as fast. How would you verify his concern, and what could you do to help him meet his quota?

What will be an ideal response?

asdfghjkl; · **Reply #1 on:** Aug 19, 2018

Answer to Question 1

One possible problem with the collapse on one side is that the mold could have been dropped on that side causing the cells to collapse on themselves. Or the material was not fully cured and when it was exposed to the air the air caused the cells to collapse. Also the chemical reaction between the poor mold release agent and the foaming agent could have caused the material to never fully expand and create a partially closed-cell part.

Answer to Question 2

Run a MI test to see the differences between the two materials, and run the machine hotter to help the newer material to melt faster.