Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


squeegee blade design

dave

#26138

squeegee blade design | 22 October, 2003

Hi, I was wondering what are the differences between a "trailing edge" style squeegee and a "diamond section" edge style. What applications tend to favor one over the other? Thanks. We are using a DEK 265

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

reply »

#26142

squeegee blade design | 23 October, 2003

The SEMA listing [ http://www.smema.org/smema5.pdf ] says: * D CUT SQUEEGEE: A single diamond edge squeegee which is shaped like an upside down house and made of polyurethane. * FOUR-SIDED DIAMOND EDGE SQUEEGEE: A polyurethane 3/8 x 3/8 four sided, four edged squeegee. The diamond corners are used as the printing edges. * TRAILING EDGE SQUEEGEE: Any squeegee mounted at an angle such that the printing edge of the squeegee trails behind the print head and the face of the squeegee slopes forward.

Alden Johnson at Cookson Electronics says, �Typically, in a standard PWB paste-printing application, a metal squeegee blade is used. Tests have shown that when printing a standard, fine-pitch application with device pitch down to as low as 0.3048mm and aperture sizes of 0.2032mm, a metal squeegee blade is perfect.

However, when printing wafers, with the pitch of the device as low as 150�m and aperture sizes as small as 80�m, a polypropylene 90 durometer, trailing edge squeegee blade is used. With such a fine mesh, there is potential to damage the stencil with a metal squeegee. There is no measurable scavenging or scooping of the apertures when using a polypropylene blade. This type of squeegee yields the best results in this application when optimized.�

reply »

dave

#26143

squeegee blade design | 23 October, 2003

Thank you

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

reply »

dave

#26144

squeegee blade design | 23 October, 2003

Thank you

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

reply »

PCB contract manufacturer

Precision Auger Dispense Pump