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Date: | Tue, 12 Sep 2006 15:34:09 +0100 |
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Brian Ellis wrote:
> Sorry, but a) what plastic
LCP
> b) what contaminants are you trying to remove
Small amounts of plastic debris - dust if you like. The parts will be
free from chemical contamination so that's not an issue.
> c) why are you using ultrasound
Seems like the obvious way to remove small particles from the surface.
Is there a better way?
> d) what additives, if any, are added to the water
None that I know of.
> e) what temperature
See process details below:
4 tanks ultrasonicator
*1st tank: warm pure water to circulate and filter
Ultrasonic power: 600W x 28KHZ
Heater: 2KW x 220V
Temp. control: 50~60 degree C
Time used in this tank: 6 min.
*2nd tank: pure water to overflow
Ultrasonic power: 600W x 28KHZ
Time used in this tank: 6 min.
*3rd tank: warm pure water to circulate and filter
Ultrasonic power: 600W x 28KHZ
Heater: 3KW x 220V
Temp. control: 50~60 degree C
Time used in this tank: 6 min.
*4th tank: air blowing
Air pressure: 6 kg / 2cmx4cm
Time used in this tank: 6 min.
> and f) what characteristics of ultrasound?
> Depending on the nature of the plastic, IPA may cause stress-cracking.
>
I don't think IPA will affect LCP but yes, we have to check that.
> Brian
>
> Eric CHRISTISON wrote:
>> We're currently ultrasonically cleaning some plastic parts in DI water
>> and may be incurring some microscopic damage to the surface.
>>
>> We've been directed to use IPA rather than DI water as a cleaning medium
>> to give a gentler clean to reduce damage.
>>
>> Does this sound like a good plan and would there be any other fluids
>> that would be more suitable?
>>
>> Regards,
>>
>>
>> --
>> Eric Christison Msc
>> Mechanical Engineer
>> Home Personal, Communication Sector
>> Imaging Division
>>
>> STMicroelectronics (R&D) Ltd
>> 33 Pinkhill
>> Edinburgh EH12 7BF
>> United Kingdom
>>
>> Tel: +44 (0)131 336 6165
>> Fax: + 44 (0)131 336 6001
>>
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>
--
Eric Christison Msc
Mechanical Engineer
Home Personal, Communication Sector
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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