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Use of solder paste after taking out from cold storage

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Hi, As I have seen in the data sheets from solder paste s... - Oct 26, 2005 by Milroy  

#37344

Use of solder paste after taking out from cold storage | 26 October, 2005

Hi,

As I have seen in the data sheets from solder paste suppliers they always recommend to keep the solder paste until it reaches the ambient temperature after taking out from normal storage temperature. Mostly the storage temperature is 5 - 10 Celsious. What is the best time to keep the solder paste after taking out from the cold storage until the printing process? What kind of defect could happened to the paste if it is kept less than one hour? Where I can see such details in the net?

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#37345

Use of solder paste after taking out from cold storage | 27 October, 2005

Good morning,

I can recommend to use solder paste softeners, which can prepare solder paste for printing process. Softeners rise paste temperature by means of pseudo-planetary motion. Therefore, solder paste reaches room temperature during only 15 minutes. Unmixed �cold� solder paste can cause printing problems with printing of first pieces due to relatively high viscosity. Trains on the stencil (top stencil surface will not be clear after first print stroke with �cold� paste), separation problems, clogging and so on.

BR, Pavel

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#37351

Use of solder paste after taking out from cold storage | 27 October, 2005

Thank you,

I think that`s a good strategy, what are the spec ifications of the softner? Is this normally available with the paste manufactureres?

Thanking for further infos...

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#37352

Use of solder paste after taking out from cold storage | 27 October, 2005

Good day,

Search the net with "Solder paste softener", or check the links below:

*Malcom http://www.malcomtech.com/products_sps.html

*Japan UNIX http://www.japanunix.co.jp/ju_en/products/UM-103.html

*Genitec http://www.genitec.com.tw/gam-60-e.htm

* Synergy Engineering http://www.synergymark.com/Unity500.htm

Here you�ll find all necessary information: specifications, descriptions, etc. The work principle is the same for all devices (mixing and rising the temperature due to pseudo-planetary motion). Choose what you like. I�ll note once again, that solder paste mixing is high recommended operation that allows you to prepare process material fast (only 15 minutes vs 2 hours) and to avoid a lot of printing problems due to unprepared material.

Price for device is varying between $1�000-$5�000 depending on model and manufacturer.

BR, Pavel

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#37359

Use of solder paste after taking out from cold storage | 27 October, 2005

Simply leave the paste out at the end of the shift for the next days use. Keeping the paste refrigerated just prolongs the shelf life. Even if you are at the expiration date leaving the paste out for 36 hrs won't make any difference. Jerry

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ajay

#37668

Use of solder paste after taking out from cold storage | 5 November, 2005

we do keep out solder paste ready for next shift or for replenish. We specified a location to keep new paste ( only one container ) near stencil machine. As soon as that is use we put another container from freeze, we make sure that at specified location their should always be new container of paste. in overall we able to use paste with normal temperature. ajay

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#37670

Use of solder paste after taking out from cold storage | 5 November, 2005

Hi,

What would you do normally when you have collected the used solder from the stencil each day?

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#37678

Use of solder paste after taking out from cold storage | 6 November, 2005

Look at my free downloads at http://www.moonmanondarkside.com and you'll see many assembly procedures starting with solder paste.

Enjoy,

MoonMan

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URL

#37697

Use of solder paste after taking out from cold storage | 7 November, 2005

Whoa! What the heck was that!? A commercial post?

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Burgandy

#37698

Use of solder paste after taking out from cold storage | 7 November, 2005

Looks like a commercial to me....!

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Samir Nagheenanajar

#37701

Use of solder paste after taking out from cold storage | 7 November, 2005

Interesting site. The guy at the screen printer looks familiar.

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mike

#37948

Use of solder paste after taking out from cold storage | 17 November, 2005

Freeze?? Dont you mean fridge?

This message was posted Add this forum to your site! Click to learn more. the Electronics Forum @

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ajay

#37957

Use of solder paste after taking out from cold storage | 18 November, 2005

in such cases we keep used paste in box & it is on the machine

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#37966

Use of solder paste after taking out from cold storage | 18 November, 2005

Moonman really needs to stop. I finally looked at his site, and it sucks. It is NOT informative, he has chosen horrible background and font colors (immediately got a headache). It is just some 'person' who thinks 'he/she' is an expert in this industry. Lets ban him/her.

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Samir Nagheenanajar

#37969

Use of solder paste after taking out from cold storage | 18 November, 2005

I agree that Moonman is a pretentious wannabe in the industry. His site has no relevant information, the only humur in there is a picture of his fat finger pushing a button.

Myself and my collegues here thought of making a "fake" consulting company ourselves - of course we won't get paid,nor would we actually "consult." We would just put pictures of machines, solder paste, charts, graphs, and IPC guidelines!

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#37981

Use of solder paste after taking out from cold storage | 18 November, 2005

I think someone's beaten you to it:

http://www.huhcorp.com/

;)

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Samir Nagheenanajar

#38021

Use of solder paste after taking out from cold storage | 21 November, 2005

Hi Ajay, my name is Samir Nagheenanajar. You have an Arab sounding name just like myself. Pleased to meet you.

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slthomas

#38022

Use of solder paste after taking out from cold storage | 21 November, 2005

"...Moonman is a pretentious wannabe in the industry.

If you look through the archives here you'll see that nothing could be further from the truth. His contributions on the past were pretty friggin' spot on.

However, he no longer posts anything that even remotely attempts to address questions directly, and that's unfortunate. I won't attempt to address the "why".

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ajay

#38158

Use of solder paste after taking out from cold storage | 1 December, 2005

hi samir, pl. conatc me ajay_doshi@utlindia.com

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Amol Kane

#38162

Use of solder paste after taking out from cold storage | 1 December, 2005

Hi Ajay, what kind of contract manufacturing does your company do? are you into Electronics manufacturing?

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#38178

Use of solder paste after taking out from cold storage | 1 December, 2005

Hi,

The temperature in the fridge is 5-10 degrees.

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ajay

#38213

Use of solder paste after taking out from cold storage | 5 December, 2005

hi Amol you can contact me at ajay_doshi@rediffmail.com or 91-9845347342

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#38247

Use of solder paste after taking out from cold storage | 6 December, 2005

Hi,

One of our suppliers suggested you could use the microwave to warm up the solder paste if you really needed to, and it did work for a full tube, but when I tried a half used tube, I thought I had invented a weapon of mass destruction. It was scary.

I don't suggest you use the microwave! A paste mixer works perfectly.

Regards,

Grant

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Mike

#38313

Use of solder paste after taking out from cold storage | 8 December, 2005

YIKES! Using a micowave to warm a tube of paste has "evil" written all over it.

This message was posted Add this forum to your site! Click to learn more. the Electronics Forum @

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#40043

How to set warm-up time of solder paste | 28 February, 2006

To set warm-up time,which standard should we select and how should we measure? Thanks!

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#40069

How to set warm-up time of solder paste | 28 February, 2006

Assuming you're using DOM and shelf life to determine what's good and what's not, you just have to know 1)the rate at which you use it up, 2) how much shelf life is left, and 3) the rate that it goes bad when not refrigerated.

From that you can tell how long before you intend to use it you should take it out.

When we used big volumes in a plant running 16 hours a day, we just made sure we had some out the night before.

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