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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 20 Oct 2003 17:55:26 -0400 |
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Madhu
What temp are you baking the boards at and how do you rack them ?
Also why do you do UV ?
Most shops only thermal cure peelables at 150 C for 5-15 minutes
You could try curing it at 140 C .
On the UV .How many joules and what does temp do these boards see
afri
-----Original Message-----
From: S.R. Madhuchandra [mailto:[log in to unmask]]
Sent: Monday, October 20, 2003 2:12 AM
To: [log in to unmask]
Subject: [TN] Warpage after PLSM
fellow technetters
In some of the part numbers, we are facing a strange phenomenon
The boards will be flat till the process of PLSM(peelable solder mask)
but after the PLSM, there will be severe warpage & wobbling
In PLSM, we are doing both UV & thermal curing
Can some one throw some light on this
Thanks in advance
Madhu
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