Laser cut step - stencil

tradename PatchWork®-stencil from LaserJob

The patented step stencil from LaserJob, called PatchWork® - stencil, was developed to print in one printing step different paste deposit heights. Due to the multiplicity of different component leads on one printed circuit board the recommended solder paste volume is not longer adjustable by the aperture size alone, but with different step heights in one stencil foil. A variety of the step stencil is the so called 3D - step stencil or 3D - PatchWork stencil, to print solder paste in deeper levels of a PCB. It is possible to print simultaneous on different levels with different solder paste deposit heights. 

Benefits

Multiple solder paste volumes in one printing step. 

Step-up/step-down on squeegee- and PCB-side possible 

Patch in Patch (step in step possible, as well as step-up or step-down)

Afterwards integration of steps in SMD - stencil or PatchWork - stencil


Step - stencil

Step - stencil

with the trade name PatchWork-stencil.

Step - stencil

Step - stencil

with a special form of step - 3D-cavity

Step - stencil

Step - stencil

with step in step application.

Step - stencil

Step - stencil

with a step in form of a cover plate.

Is it possible that the squeegee may get stuck in the step area?

With our special technology, which is a combination of a laser cut and laser welding process, we guarantee smooth transition on the patch edges. The squeegee blade can easy adjust to step heights or depths. 


Are design rules available for step stencils?

There are design guidelines available form IPC for step stencils, see IPC-7525B (2011), which can be ordered direct through IPC.org or through FED (Fachverband Elektronik-Design e.V.)


What are the delivery times for step stencils?

The standard delivery time is: 3 working days (ex works).

Express services are possible in 6- or 24-hours.

Which step heights/depths can be realized?

Generally are step height differences possible with our technology to max. 2 mm. However

design guidelines for the printing process should be considered, especially the distances from the step edge to the aperture in the step area. Eventually it is necessary to adjust the squeegee blade of the printer as well. As a thumb rule you can say: for every 25µm step height difference, the distance in the step area to the aperture might be 0,9mm. That means a step height difference of 0,1mm causes a distance in the step area from the step edge to the aperture of 3,6mm. In most cases a step height differences of more than 80µm is rarely applied in the SMD-Technology 


Are subsequent changes of steps in height/depth possible?

Even if the step stencil is already in use in your production, subsequent modifications in step heights are possible. However, a prerequisite is that the stencil is in good order and condition. 


Are multiple steps in one stencil possible?

Yes, multiple steps with different step heights and depths are possible in one stencil.






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LaserJob GmbH
Liebigstraße 14
82256 Fürstenfeldbruck
Deutschland