March, 2018
www.us-tech.com Continued from previous page
crimp anvil. This can also reveal itself with exces- sive flash or burrs on the terminal.
Whenever an applicator is installed into a press, it is recommended to either hand-cycle or cycle the press in jog mode two or three times to ensure the tooling closes properly without collisions. Presses should be checked regularly to con- firm that they are set for the proper shut height. For most mini-style applicators, the standard shut height is 5.3 in. ±0.0008 in. (13.6 cm ±0.02 cm). If the shut height on one press is set too low, this may cause the tooling to crash. When presses are properly adjusted for shut height, consistent results can be expected when applicators are moved between presses. Shut heights can be con- firmed using simple shut height gauges or with press analyzers that are readily available on the market.
Preventive Maintenance
All machinery, including crimp applicators, should have a detailed preventive maintenance plan outlin- ing service intervals and required steps. The plan should be well-docu- mented and key personnel should be thoroughly trained to ensure it is
EMS Intros Jet-Dispense SMT Adhesives
Delaware, OH — Engineered Materials Systems (EMS) has intro- duced a range of jet-dispensable SMT adhesives. EMS and Essemtec col- laborated to develop a fast and accu- rate method of attaching small die packages to printed electronics. Essemtec’s Puma jet dispenser can accurately place adhesive dots on fine-line silver ink lands.
The jetting process eliminates the need for the z-axis accuracy of
Page 111 Best Practices in Crimp Applicator Maintenance properly carried out.
Prior to long-term storage, make sure the applicator is well-cleaned, lubricated and wrapped
in plastic to prevent rust. This will ensure that it will be in good condition if it is needed again in the future.
Tooling collision can be avoided by checking presses for shut height and by using ram collars.
A thorough training program can save costs and increase efficiency. Operators and technicians should be trained to understand crimp quality indicators, as well as basic applicator operation, such as set up and handling. They should also be trained for cleaning and preventive maintenance. Catching defects or seeing indicators early will reduce scrap and tooling damage, minimizing tooling costs. Properly maintained applicators will not only save unwanted downtime, but also ensure better crimp quality. Contact: Schleuniger, Inc., 87 Colin Drive, Manchester, NH 03103 603-668-8117 fax: 603-668-8119 E-mail:
sales@schleuniger.com Web:
www.schleuniger-na.com
See at IPC APEX, Booth 3033
Jet dispensed adhesive for small die packages.
needle dispense, enabling rapid SMT attach on nonplanar or 3D surfaces using high-speed laser mapping in real time per sheet.
The SMT adhesives have been optimized for accurate jet dispense and compatibility with EMS PTF inks to deliver robust circuits that withstand ASTM F3147-15 multiple mandrel flex cycles.
Essemtec’s PUMA can jet dis- pense multiple materials. such as sil- ver epoxy, staking compound and encapsulant, as well as pick-and- place numerous components on one platform. This EMS and Essemtec solution is especially beneficial for printed PTF electronics. Contact: Engineered Materials Systems, Inc., 100 Innovation Court, Delaware, OH 43015 740-203-2957
E-mail:
lallison@conductives.com Web:
www.emsadhesives.com
See at IPC APEX, Booth 721 See at APEX, Booth 1019
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