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SMTnet Express February 7, 2013, Subscribers: 26168, Members: Companies: 13281, Users: 34286

Effect of Silicone Contamination on Assembly Processes

Silicone contamination is known to have a negative impact on assembly processes such as soldering, adhesive bonding, coating, and wire bonding. In particular, silicone is known to cause de-wetting of materials from surfaces and can result in adhesive failures. There are many sources for silicone contamination with common sources being mold releases or lubricants on manufacturing tools, offgassing during cure of silicone paste adhesives, and residue from pressure sensitive tape. This effort addresses silicone contamination by quantifying adhesive effects under known silicone contaminations. The first step in this effort identified an FT-IR spectroscopic detection limit for surface silicone utilizing the area under the 1263 cm-1 (Si-CH3) absorbance peak as a function of concentration (µg/cm2). The next step was to pre-contaminate surfaces with known concentrations of silicone oil and assess the effects on surface wetting and adhesion. This information will be used to establish guidelines for silicone contamination in different manufacturing areas within Harris Corporation.

First published in the 2012 IPC APEX EXPO technical conference proceedings.

by: John Meyer, Carlyn A. Smith, Ph.D.; Harris Corporation

read article »

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Internet Marketing tip of the week

Control Your Description in Search Engines

Most of you know that getting your website on the first page of Google search results is quite important. However, when you accomplish this, you aren't done yet.

Now you need to make sure your website listing is clicked instead of the other results on the page. How do you accomplish this?

We know the first five results on the page are clicked most often; therefore, strive to be in the top 5.
Control your description in the search results. The description of your website in the search results can come from a few places:
- Meta Description tag on your webpages - This is the best way to control what the user sees in the search engine results. If you right click on your webpage and choose 'view source' you should see a tag that looks something like:
  <META NAME="Description" CONTENT="A DESCRIPTION OF YOUR PAGE SHOULD BE HERE ." />
- Information that search engine spiders 'read' on your page. If there is no meta description in your website's code and if you don't have anything in the Open Directory Project then search engines will use information that they retrieve when spidering your website. This may cause your description to be much less enticing.
- Open Directory Project - If your description in the search results comes from the Open Directory Project and you don't want that to appear, you can use the following meta tag in your code:
  <meta name="robots" content="NOODP" />
Now that you are in control of what searchers see in the search results, you can try different messages to see what works best. Your meta description should be at least one full sentence and offer a specific solution to a specific problem. Make the user feel comfortable that your solution will solve his/her problem and you will get the click...

Roland Girouard, Managing Director, SMTnet

The SMTnet.com marketing team provides internet marketing consulting services for the SMT Industry.

Contact us for more information »

Cleaning Before Conformal Coating - Free Online Webinar
Feb. 14.

APEX Expo 2013
Feb. 19., San Diego, CA, USA

Jobs:

SMT Equipment/Pick & Place Programmer

Huntington Beach, CA, USA | TRANTRONICS, INC.

Senior Customer Service Engineer

Tampa, FL, USA | EUROPLACER

Field Service Technician

Madison, WI, USA | ASM Assembly Systems

Resumes:

Process Engineer

San Diego, CA, USA

Electronic Process Engineer

Brampton, Orlando, Canada

SMT Process Engineering Specialist

Kitchener, Ontario, Canada

Industry Associations Events

SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore

Next Event: Webtorial - Soldering Reliability Issues for the 21st Century - February 12 & 26

IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: CID+ Certified Interconnect Designer � Advanced Workshop & Exam in conjunction with IPC APEX EXPO - February 15 - 17

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard

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