Precision Fine Pitch Aperture Cleaners Thousands of dollars less than fully-automatic cleaners Low solvent usage and running costs Fast cleaning time of 1-3 minutes Minimal waste disposal Portable unit can be used directly on the screen printe
Technical Library | 1999-04-15 06:54:01.0
High-speed printing techniques are revealed that break the speed barrier resulting from air entrapment in large apertures at fast squeegee speeds. Adhesive printability test results using conventional thickness stencils to achieve a significant range of d
Technical Library | 2018-09-26 20:33:26.0
Bottom terminated components, or BTCs, have been rapidly incorporated into PCB designs because of their low cost, small footprint and overall reliability. The combination of leadless terminations with underside ground/thermal pads have presented a multitude of challenges to PCB assemblers, including tilting, poor solder fillet formation, difficult inspection and – most notably – center pad voiding. Voids in large SMT solder joints can be difficult to predict and control due to the variety of input variables that can influence their formation. Solder paste chemistries, PCB final finishes, and reflow profiles and atmospheres have all been scrutinized, and their effects well documented. Additionally, many of the published center pad voiding studies have focused on optimizing center pad footprint and stencil aperture designs. This study focuses on I/O pad stencil modifications rather than center pad modifications. It shows a no-cost, easily implemented I/O design guideline that can be deployed to consistently and repeatedly reduce void formation on BTC-style packages.
Technical Library | 2023-07-25 16:50:02.0
Some of the new handheld communication devices offer real challenges to the paste printing process. Normally, there are very small devices like 01005 chip components as well as 0.3 mm pitch uBGA along with other devices that require higher deposits of solder paste. Surface mount connectors or RF shields with coplanarity issues fall into this category. Aperture sizes for the small devices require a stencil thickness in the 50 to 75 um (2-3 mils) range for effective paste transfer whereas the RF shield and SMT connector would like at least 150 um (6 mils) paste height. Spacing is too small to use normal step stencils. This paper will explore a different type of step stencil for this application; a "Two-Print Stencil Process" step stencil. Here is a brief description of a "Two-Print Stencil Process". A 50 to 75 um (2-3 mils) stencil is used to print solder paste for the 01005, 0.3 mm pitch uBGA and other fine pitch components. While this paste is still wet a second in-line stencil printer is used to print all other components using a second thicker stencil. This second stencil has relief pockets on the contact side of the stencil any paste was printed with the first stencil. Design guidelines for minimum keep-out distances between the relief step, the fine pitch apertures, and the RF Shields apertures as well relief pocket height clearance of the paste printed by the first print stencil will be provided.
We produce laser cut Solder Stencils and inspection templates. We also supply all of your solder paste needs.
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Tropical Stencil is dedicated to providing the highest quality Laser Cut Stencils; with our rapid response, you will have your Stencil delivered on-time.
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professional manufacturer of pcb
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Manufacturer of materials for the electronics assembly marketplace. Our RoHS-compliant products include solder pastes, fluxes, solder powder, core wire and bar solder and process support products.
ALPHA® TETRABOND™ is the culmination of "frameless" stencil development; an elegantly simple system designed to enhance the rigidity of the foil, making safe mounting and demounting an easier proposition. Innovatively encompassed in a thin, one piece
SMT Framed Stencils are laser cut solder paste stencils designed to work on SMT printing machines. These laser cut stencils are permanently glued into a frame. These framed stencils are are designed for highly repeatable continuous operation in volum
