Re: Questions for users of AIMS Tooling

From: Rick Harrington (
Date: Wed May 06 1998 - 14:31:08 EEST

Hello Neil and list.

In response to your questions.

1.Freeze time or cycle time can be anywhere from 20 seconds to 5 minutes,
depending on size and mass of part. This is also dependant on type of
epoxy and mold construction. Water lines help lot.

2.We typically eject the part immediately

3.The cooling time would be included in the cycle time stated above. Some
times we will use a cold air nozzle to help cool quicker. We have found
that drastic temperature changes will decrease the tool life. In the old
days we even took the inserts out and cooled them in ice.

At 11:29 AM 5/6/98 +0100, you wrote:
>At De Montfort University in the UK we are investigating the the effects
>of freezing time when injection moulding into epoxy tools. I would be
>grateful if anyone could answer the following questions, feel free to
>elaborate on answers as you wish as I'm sure a number of the answers
>will vary according to shot weight, geometry etc......
>1. What freeze time (ie time between injection and mould opening do you

>2. After mould opening do you eject the part immediately or allow it to
>cool more?
>3. How much cooling time, and to what temperature do you allow the tool
>to cool before the next shot (do you use water lines/air cooling etc.).

>Many Thanks
>Neil Hopkinson
>Department of Mechanical & Manufacturing Engineering
>De Montfort University
>LE1 9BH
>Tel: 0116 2551551 x8093
>For more information about the rp-ml, see

Rick Harrington

Harrington Product Development Center

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