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Author Question: Discuss why the compression zone of a nylon-type screw is so much shorter than the compression zone ... (Read 30 times)

mpobi80

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on: Aug 19, 2018
Discuss why the compression zone of a nylon-type screw is so much shorter than the compression zone in a polyethylene-type screw.
 
  What will be an ideal response?

Question 2

Describe a spider die. What adjustments are typical and how are they made?
 
  What will be an ideal response?


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popopong

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

Nylon melts over a much narrower range than polyethylene. Since the purpose of the compression zone is to melt the polymer, the distance to do the melting need not be as long with the more easily melted nylon.

Answer to Question 2

Spider dies are used to make hallow parts, such as tubes and pipes. The inside diameter of the die decreases gradually and smoothly from the inlet of the die to the land. The land is the final output zone and in this zone the inside diameter of the die is constant. The mandrel inside the die


mpobi80

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Reply 2 on: Aug 19, 2018
Thanks for the timely response, appreciate it

nguyenhoanhat

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Reply 3 on: Yesterday
Gracias!

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