We have found medium to long wave (FIR) to be a better infrared curing
emitter than short wave (NIR). T3 lamps lean towards short wave.
On Thu, Aug 20, 2009 at 12:39 PM, Inge<[log in to unmask]> wrote:
> Thanks all,
> I have a plan for tomorrow:
> 1. coat some glass plates or plexi (may be less good, depending on what
> solvent is used)
> 2. at various temp
> 3. study under microscope what happens
> 4. cure with IR
> 5. cure on a hot plate under microscope with light from lower source
>
> bye, see you
>
> Inge
>
>
> ----- Original Message ----- From: "Kane, Amol (349)"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, August 20, 2009 9:24 PM
> Subject: Re: [TN] Manual spraying
>
>
> Inge, also look to see if there is a requirement that calls out (or
> expressly prohibits from) shaking the can prior to use. We use (different)
> coatings with either requirement, and not following it is sure to exhibit
> issues.
>
> Regards,
> Amol
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
> Sent: Thursday, August 20, 2009 3:17 PM
> To: [log in to unmask]
> Subject: Re: [TN] Manual spraying
>
> Your advice is in the category 'common sense'. If i had over exposed photos
> taken with an ordinary camera, and you showed me how to handle the ISO
> setting, that had not been a sales trigging even if you were a camera
> salesman.
> Inge
>
>
> ----- Original Message ----- From: "Brian Stumm"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, August 20, 2009 9:04 PM
> Subject: Re: [TN] Manual spraying
>
>
> I sent this to Inge offlist because I was worried it would come across
> as a sales pitch but since it goes along with what Gregg said I
> decided to share. I cannot provide any experience for the
> applications/spray side of conformal coatings but have *some*
> experience on the curing side.
>
> I've seen airflow from curing systems introduce bubbles in coatings.
> I've also seen ovens that skin the coating on the outside trapping
> solvent below the surface that later off-gases and bubbles and
> sometimes blisters. These are usually much larger bubbles though. I
> don't want this to sound like an advertisement (since we manufacture
> ovens) but we build separate products for curing that use infrared
> heaters and very low airflow whereas our reflow systems are
> convection. Just recently I was on-site at a customer that was mixing
> the coating very runny (3 parts solvent to one part coating compared
> to recommended 1.5 to 1 ratio) and even the low flow rate of supply
> air into the oven was causing the coating to flow which resulted in
> uneven coating thickness and very tiny bubbles in the cured coating.
> At least the customer believed the oven caused it. They used a robotic
> spray cell which used compressed air to pressurize the 2 pots. After
> reducing the airflow rate of the oven and switching to N2 instead of
> compressed air the bubbles went away. Both changes were made at the
> same time so I do not know for sure which was the culprit.
>
> On Thu, Aug 20, 2009 at 11:52 AM, Temkin,
> Gregg<[log in to unmask]> wrote:
>>
>> To continue with Brian's track, it's common with heavily solvent loaded
>> conformal coatings (spray processes materials are often thinned with
>> additional amounts of solvent) to see bubbling if the solvent if its not
>> allowed to evaporate out of the coating prior to the outer surface curing
>> curing. Excessive applied thickness will also promote bubbles. The sprayed
>> boards should be allowed to sit and reach a handling cure before being
>> heat cured.
>>
>> Gregg
>>
>> -----Original Message-----
>> From: Inge [mailto:[log in to unmask]]
>> Sent: Thursday, August 20, 2009 11:32 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Manual spraying
>>
>> Cured for one hour at +80 Centigrades. We have not done microscopy when
>> wet
>> (the cards).
>> Inge
>>
>>
>> ----- Original Message -----
>> From: "Brian Stumm" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Thursday, August 20, 2009 8:21 PM
>> Subject: Re: [TN] Manual spraying
>>
>>
>>> How do you dry/cure the coating? Are you sure it is being introduced
>>> during coating and not during drying?
>>>
>>> On Thu, Aug 20, 2009 at 11:17 AM, Inge<[log in to unmask]> wrote:
>>>>
>>>> Good Evening,
>>>> we use small cans filled with 1B1 conformal coating for handspraying
>>>> boards.
>>>> The guys are not satisfied with the result, because sometimes the result
>>>> is
>>>> matte. Microscope photos show thousands of microscopic bubbles in the
>>>> coating. I suspect that it's included driving gas. Or wrong handling the
>>>> spray can.Anyone out there with experience? How do you avoid this
>>>> problem?
>>>> /Inge
>>>> ---------------------------------------------------
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