I basically run the glue through the oven at the same temperature
profile as reflow. I just knocked down the zones (5 in all) a few
degrees each. So far I have not had any problems (that I know of,
sometime the operators forget to fill out the inspection sheets so I
am not always aware that there are problems).
We run the glue side then flip the PCB's and run the paste side. So
far no parts have fallen off, except for a couple of times when the
PCB's were run across the edge of a desk by accident (don't ask
why) but otherwise they stay in place.
I am running AIM glue and paste in a no clean operation.
Hope this helps.
Ryan
Date sent: Wed, 7 Apr 1999 14:28:04 -0400
Send reply to: "TechNet E-Mail Forum." <[log in to unmask]>,
"Tempea, Ioan" <[log in to unmask]>
From: "Tempea, Ioan" <[log in to unmask]>
Subject: Re: [TN] Can adhesive go thru reflow soldering?
To: [log in to unmask]
> Davis,
>
> I made some tests as follows: I used adhesive and solder paste for the
> components on the solder side of double sided assemblies.
> So, after printing the solder cream the adhesive has been dispensed.
> Naturally, the board is reflowed, with the adhesive uncured, the curing
> occurs at a certain stage of the reflowing.
> Of course, the curing temperature of the glue is about 150C and the
> reflowing cycle was exposing the board to 280C.
> I couldn't find any problem with the adhesive after waving the boards, so
> the glue didn't crack during the exposure to 280C or the tensions during the
> wave soldering.
>
> So the 150C for 90-120 sec is simply the curing cycle, but after curing the
> adhesive can suffer reflow and waving. I'm pretty sure of that.
>
> Regards, Ioan
>
> > -----Original Message-----
> > From: Davis Yang [SMTP:[log in to unmask]]
> > Sent: Wednesday, April 07, 1999 12:06 AM
> > To: [log in to unmask]
> > Subject: [TN] Can adhesive go thru reflow soldering?
> >
> > Dear Sir,
> > We have to put adhesive(glue) on PCBA before reflow. the adhesive
> > we are using is LOCTITE 3609. but the spec for the adhesive is 150C
> > degree with 90 - 120 Seconds. We want to know if any issue for the
> > adhesive to go thru reflow profile? we are worrying about potential
> > reliability problem. and the supplier can't give us the answer.
> > please give any advice on the question.
> > thanks a lot!
> > Davis
> >
> > ################################################################
> > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> > ################################################################
> > To subscribe/unsubscribe, send a message to [log in to unmask] with
> > following text in the body:
> > To subscribe: SUBSCRIBE TechNet <your full name>
> > To unsubscribe: SIGNOFF TechNet
> > ################################################################
> > Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
> > section for additional information.
> > For technical support contact Hugo Scaramuzza at [log in to unmask] or
> > 847-509-9700 ext.312
> > ################################################################
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
> To subscribe: SUBSCRIBE TechNet <your full name>
> To unsubscribe: SIGNOFF TechNet
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional inform
ation.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
> ################################################################
>
-----------------------
Ryan Chase
Manufacturing Engineer
GE Harris
403-214-4502
Fax 403-287-3107
[log in to unmask]
################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE TechNet <your full name>
To unsubscribe: SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|