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The Critical Purpose Of Solder Paste Printing In New Product Intro


Surface mount assembly (SMT) carries a crucial role to play from the Awesome Introduction (NPI) process for electronics manufacturing.

The high level of automation from the SMT methodology comes with a variety of advantages, from automatic correction of errors, to simpler and faster assembly, better mechanical performance, increased production rates and reduced labour costs.

The SMT assembly process on an electronics manufacturing services (EMS) provider can be categorised into four key stages:

Solder Paste Printing
Pick make
Oven Profiling
Automated Optical Inspection (AOI)
With respect to the complexity in the design, or perhaps your own outsourcing strategy, your product could go through these processes therefore, or else you might discover that you omit a step or two.

We should highlight the particular attributes, along with the vital importance, in the solder paste printing process for your NPI.

Attempting to your specifications
The first task for your EMS provider may be to analyse the pcb (PCB) data that is certainly specific in your order, to ensure that they find the required stencil thickness and the the best option material.

Solder paste printing is the most common technique of applying solder paste with a PCB. Accurate solder paste application is hugely essential in avoiding assembly defects which may use a knock on effect further around the production process. So it will be vital until this key stage is correctly managed and controlled from your EMS partner.

Solder paste is actually powdered solder that has been suspended within a thick medium called flux. The flux provides a form of temporary adhesive, holding the constituents in place before soldering process begins. Solder paste is used on the PCB employing a stencil (generally stainless steel, but occasionally nickel,) then once the solder is melted it forms an electrical/mechanical connection.

The thickness from the stencil is the thing that determines the level of solder applied. For some projects it may be important to have a lot of thicknesses in different areas inside one stencil (sometimes called a multi-level stencil).

Another main factor to consider within the solder printing process is paste release. The right form of solder paste should be selected dependant on the size of the apertures (or holes) inside stencil. In the event the apertures have become small, as an example, then a solder paste may be very likely to staying with the stencil instead of adhering correctly to the PCB.

Controlling the rate of paste release however can be managed, either start by making changes for the kind of the aperture or by lessening the thickness with the stencil.

The type of solder paste utilized may also influence on a final top printing quality, so it is crucial that you find the appropriate blend of solder sphere size and alloy for your project, and make sure it is mixed for the correct consistency before use.

Ensuring quality
When the stencil may be designed along with your EMS partner is ready to generate the first PCB, they will next be thinking about machine settings.

Quite simply, the flatter you can keep the PCB from the printing process, the better final results will probably be. So by fully supporting the PCB during the printing stage,either using automated tooling pins or using a dedicated support plate, your EMS provider can get rid of the possibility of any defects including poor paste deposit or smudging.

You'll want to look at the speed and pressure from the squeegees throughout the printing process. One solution is usually to have one speed to the solder paste but to get varying levels of pressure, using the unique specifications with the PCB as well as the entire squeegee.

Cleaning the stencils, both before and throughout production, is likewise essential in ensuring quality control. Many

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