May, 2016 Continued from previous page
complicated undertaking that re - uires engineers and technicians who understand the individual needs of customers. JST works with automa- tion partners, such as Bosch Rexroth, to develop comprehensive wet bench cleaning stations. These stations incorporate linear motion and elec- tric drive and control technology. In a recent project, the compa-
www.us-
tech.com Automated Cleaning Processes.... “This rotational fixture also
enables the rods to be cleaned to a very high purity,” says Bertagnolli. “We use a variety of rotational clean- ing fixtures quite often, but also incor- porate other designs and techniques as well — whatever will be most effec- tive in getting the job done efficiently.” Bertagnolli also notes that not
every project is fully customized from the ground up. Often, standard automation platforms can be cus- tomized according to length, height and number of baths. Cleaning process designers can consult with automation suppliers to determine where to put the transfer system, and which automation modules will
fit best in the available space. Semi-Automated Systems There is also a class of semi-
automated equipment that enables automated process control and includes a built-in transfer system, in a relatively small footprint. This type of system is an economical solu- tion to lower-volume cleaning of such products as nuclear sensors, crystals and polysilicon. “These semi-automated clean-
ing systems are ideal for companies that are cleaning MEMs and smaller semiconductors. They are a very cost- effective means of automation,” says Bertagnolli.
JST manufactures the Tigress,
a two-axis, compact, semi-automated wet bench, which is designed to meet the needs of smaller semiconductor companies. This type of cleaning sys- tem is appropriate for MEMs, LEDs and silicon applications. The compa- ny also offers a dual version of the system. This model is popular among semiconductor manufacturers who use it to clean, strip and etch sub- strates with cleaning agents to remove photoresists. Contact: JST Manufacturing,
Inc., 219 E 50th Street, Boise, ID 83714 % 208-377-1120 fax: 208-377- 3645 E-mail:
info@jstmfg.com Web:
www.jstmfg.com r
Page 61
The industrs only 4 channel multi-function station!
JST’s Tigress, a semi-automated wet bench for smaller
semiconductor applications.
nies worked together to create an automated system that is capable of cleaning silicon chunks to the extreme purity of 11N. The project involved building a cleaning line 138ft (42m) in length and includes multiple gantry robots. Bertagnolli explains that the
system was developed to meet a sili- con throughput requirement of four tons for each 22-hour shift. The com- panies built a basket system to transport the material through the process, which included etch-clean- ing and vacuum drying. To make such a long cleaning system success- ful, JST built it in two units. In the first unit, baskets of chunks are loaded through an auto-door. Two- axis robots then cycle them through five acid-etch baths and two rinse baths arranged in a single row along the second unit. During the silicon cleaning
process, protecting the components against contamination and pitting is critical. Yet, one of the unusual aspects of this system is that the first unit of the line employs overhead gantry, or Cartesian robots, which are not often used in semiconductor process systems to avoid generating particles over the product. However, after extensive particle testing in cleanroom conditions, the system proved to generate far fewer particles than the specifications required. Proprietary seals keep the linear motion rolling strips clean, and pre- vent the chemical etch from pitting the linear modules. The system also incorporates other features, which ensure that it meets Class 10 clean- room standards. The companies also partnered
on a sister project that involved the cleaning of silicon seed rods that grow the polysilicon ingots from which the chunks are made. The seed rod cleaning tool uses a gantry robot to move the ingot-carrying cylindri- cal carriages through a sequence of etch baths. One of the keys to the solution is a custom designed fixture that rotates the rods in order to have them etched evenly.
200 Watt hot air iron i-TOOL AIR S | Efficient soldering with 150 Watt i-TOOL |
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Easy desoldering of THT components with the | ergonomic 150 Watt X-TOOL VARIO
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Contact us today!
Come See us at SMT/Hybrid/Packaging Hall 7, Booth 117
and NEPCON China: Booth 1F35
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| 13 – 17 March 2016 | Las Vegas, Nevada ERSA North America
Booth 1326
i-con.info@
kurtzersa.com See at NE 1PCON China, Booth 1F35 and SMT Hybrid Packaging, Booth 7-117 3
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