IML problem
IML problem
(OP)
Hi all,
Just wondering if anyone can point me to the right direction in solving this IML issue.
Here are the info:-
- IML foil is PET 0.75mm
- Part to be IML is PC material.
- Mould temp during test, 45-55degC
- Part is a mobile phone front window. It is a rectangular part with only slight curve, transparent PC with IML foil to make a significant pattern and small opening for the front LCD. ITs very common on flip phones.
Problem:-
- Molded parts fail several test such as vibration abrasion test, temperature test, salt mist test.
- What happen is for example in salt mist test, the IML foil would peel off.
- Also, when the test fail, it would only occur randomly such as 2 or 3 fail parts out of 5.
Question:-
- does mould release agent affect IML foil adhesive properties. During mould test, we sprayed some mould release agent on cavity side during start of moulding.
- how bout the mould temperature affect on the IML foil adhesive properties?
Any advise is welcome. thanks
Just wondering if anyone can point me to the right direction in solving this IML issue.
Here are the info:-
- IML foil is PET 0.75mm
- Part to be IML is PC material.
- Mould temp during test, 45-55degC
- Part is a mobile phone front window. It is a rectangular part with only slight curve, transparent PC with IML foil to make a significant pattern and small opening for the front LCD. ITs very common on flip phones.
Problem:-
- Molded parts fail several test such as vibration abrasion test, temperature test, salt mist test.
- What happen is for example in salt mist test, the IML foil would peel off.
- Also, when the test fail, it would only occur randomly such as 2 or 3 fail parts out of 5.
Question:-
- does mould release agent affect IML foil adhesive properties. During mould test, we sprayed some mould release agent on cavity side during start of moulding.
- how bout the mould temperature affect on the IML foil adhesive properties?
Any advise is welcome. thanks






RE: IML problem
What is the function of mould release.
What is your problem.
Is there a great similarity between the two.
Have you draw polished the mould, especially the core so as to reduce the need for mould release.
Regards
Pat
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RE: IML problem
Just wondering if anyone had any problem with their IML foil when they spray mould release agent during moulding.
My problem is one the moulded parts are brought to testing, the IML foil will peel off the parts.
RE: IML problem
RE: IML problem
Regards
Pat
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RE: IML problem
Not mold temperature but resin temperature affect the adhesion.
If you are applying taber abrasion test. You must find more durable films.
If you are applying thermal shock and if it peels off after testing. you must select proper film which can be bonded with pc resin strongly. This choice mostly is the film that has been produced from the same type resin.
RE: IML problem
If they are incorporated into the compound they will migrate to the surface during moulding.
If they are sprayed onto the mould they will not effect the surface between the film and the resin IF thy can be excluded from that area. We see no evidence here to date to suggest that the interface has been successfully protected from MR spray
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: IML problem
Silicone release spray:
We mould parts that require printing or Chromium plating.
When we run these parts, Si spray is locked away and not used anywhere on site - it is very pervasive and contaminates processes tens of metres away (been there, done that, had the rejects to prove it!)
Cheers
Harry
www.tynevalleyplastics.co.uk
RE: IML problem
RE: IML problem
Regarding the adhesive properties of foil and plastic part, doesn't the adhesion between these 2 properties created by an adhesion layer on the IML foil instead of the type of foil material?