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October 2001

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Thu, 4 Oct 2001 17:13:06 +0800
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hello,

	i think bake the boards at 140-150 c for 1-2 hours prior is enough. but before HAL it is better to bake the boards at 155 C for 2 hours.



  



======= 2001-10-03 您在来信中写道:=======



>I normally bake the bare boards for 1 hour at 100  5 C.  This is sufficient to dry the boards prior to assembly.  The only failures that I have encountered was with ridged-flex boards that were not pre-baked.

>

>

>

>On Wed, 03 October 2001, "Elensky, Richard" wrote:

>

>

>

>>

>

>> We "baked" boards at 55癈 for 12 hours (best we could do) (13" x 17" boards,

>

>> 4 layer, 12 per batch).  The results were not good.  Our survival rate was

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>> about 80.

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>>

>

>> Our PCB fab shop suggested 150癈 for 4 hours.

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>>

>

>>

>

>> Richard Elensky

>

>> Sr. Manufacturing Engineer

>

>> [log in to unmask] <mailto:[log in to unmask]>

>

>>

>

>> Tel:  559-292-1111  x246

>

>> Fax:  559-292-9355

>

>>

>

>> Dantel

>

>> 2991 North Argyle Ave.

>

>> Fresno, CA, 93727

>

>> Visit our web site at:

>

>> http:// www.dantel.com <http://www.dantel.com>

>

>>

>

>>

>

>>         ----------

>

>>         From:  Yu-Hung Shiau [SMTP:[log in to unmask]]

>

>>         Sent:  Wednesday, October 03, 2001 4:25 PM

>

>>         To:  [log in to unmask]

>

>>         Subject:  [TN] PCB baking conditions

>

>>

>

>>         Hi,

>

>>         * Is anybody sure about the temperatre and time for baking the bare

>

>> PCBs

>

>>         that were humidified by condensed moisture to prevent SMT problems?

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>>         * Is 120F for 2 hrs appropriate?

>

>>         Thank you for any input.

>

>>         YH Shiau

>

>>

>

>>

>

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= = = = = = = = = = = = = = = = = = = =

			



                    致

礼!

				 

               jinrong

               [log in to unmask]

					2001-10-04 

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