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October 2003

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Subject:
From:
Afri Singh <[log in to unmask]>
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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