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SMT electronics assembly manufacturing forum.


Tray Parts and Velcro Straps

#22292

Tray Parts and Velcro Straps | 6 November, 2002

Hello Everyone, I have been noticing a trend. Many tray packaged parts are now being supplied with velcro straps to secure the trays. Am I wrong in thinking that this is a major source of static electricity? All of these components are BGA, QFP, TSOP, etc..... They are usually the more expensive packages and are very static sensitive. Is this a problem? Any help would be greatly appreciated.

Thanks

Chris

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#22312

Tray Parts and Velcro Straps | 7 November, 2002

Yeh, that RIPPPPP sound that seperating velcro makes is a real hint isn't it. Use your field meter to confirm your suspicions. We cut the straps.

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#22313

Tray Parts and Velcro Straps | 7 November, 2002

We have tested several that have come in to our facility and all the ones we have seen so far are ESD safe matierial (black). I'll take these over rubber bands any day!

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#22315

Tray Parts and Velcro Straps | 7 November, 2002

Not being a smart alic, just curious....... So if velcro is made out of that black esd safe material then it is safe to use around sensitive parts? Is there no static discharge or is it transferred to the tray and out the mat/wriststrap?

They could make carpet out of that stuff and market it to the industry

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Edward

#22318

Tray Parts and Velcro Straps | 7 November, 2002

Uh, Great Idea..... There is and has been ESD safe carpet for years.

We have it in our manufacturing area right now.

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#22322

Tray Parts and Velcro Straps | 7 November, 2002

This esd safe carpet is new to me.

How is the carpet tested/maintained? Are you still wearing the typical foot strap or did they sell you some other kind of footwear?

Sorry for "changing the initial subject" of this post.

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#22327

Tray Parts and Velcro Straps | 7 November, 2002

We have ESD safe velcro hook soled shoes for our operators. It keeps them at their machines.

Seriously, everyone I've seen using it just uses heel straps and vacuums the carpet. Granted, many of them looked like they could use a shampooing, but I don't know if it requires a special (no residue?) shampoo or not.

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#22335

Tray Parts and Velcro Straps | 8 November, 2002

ESD safe and conductive are 2 totaly different situations. There are ESD safe carpets but I don't think I have seen coductive carpet. For heel straps to work in a carpeted area it would have to be conductive. Don't get the 2 mixed up it can cause dead bugs!

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#22340

Tray Parts and Velcro Straps | 8 November, 2002

I have....they lay down copper strips every 10 feet or so , attached to house ground, then glue down the carpet.

The glue is filled with carbon filaments, as is the carpet itself.

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#22361

Tray Parts and Velcro Straps | 11 November, 2002

Cool! What will they think of next! Maybe solder with no lead or parts with thousands of connections you cant see!

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