The process of creating a PCB is complex and involves a large number of steps beginning with the Layout stage and culminating in the assembly of the boards. The entire process goes through specifications, electrical design, physical design, manufacturing and finally, assembly. Most of these stages are replete with chances of probable error.
The printed circuit board assembly process alone comprises of the following stages- a) applying solder paste b) pick and place components c) heat/reflow solder d) cool and test.
The use of laser cut SMT stencils in the process of applying solder paste cannot be over emphasized. Solder paste only needs to go where the component must be in contact with a metal landing pad. This is made possible with a solder stencil. With the solder screen in correct position, a runner is moved across the screen applying solder paste through the holes, onto the board.
Essentially a stencil works in the following manner:
Laser cut SMT stencils have smooth internal pad walls, which facilitate superior paste release. Its advantage also stems from the fact that it is fast and easy to work with and allows for a high degree of accuracy. Since these stencils significantly reduce the potential for errors, there is little risk of having to rework the board or replace its components. With the time and labour required to manufacture the board significantly reduced, what also results is a significant cost advantage. The fact that the stencil makes it possible to print fine print devices is also an added benefit. Stencils therefore go a long way in increasing the overall quality of the PCB since the chances of bridging, tombstoning or balling on the board are significantly reduced.
There are a number of different types of stencils that can be opted for during the electronics assembly process. Some of them include:
Typically stencils are made out of stainless steel on account of their durability, however, stencils made up of Mylar are also common. Varying from .005″ to .007″ in thickness, a large majority of stencils are found in 20″x20″ size.
Technotronix is one of the kingpins in offering PCB Layout and manufacturing solution to all predominant industries. With a strong team of technical professionals, it has gained expertise in providing faster and cost effective PCB Prototyping Services.
We provide professional PCB Assembly services with 40 years of expertise. Our accurate PCB assembly process meets the quality standards, including ISO-9001:2015, RoHS, and more. You can rely on our PCB design tools that, in turn, lead to that perfect PCB Assembly. Our superior engineering capabilities mean that each board matches your exact requirements and technical specifications. If you have any questions or any requirements related to PCB assembly service, please feel free to contact us via email at sales@technotronix.us or call at 714/630-9200.
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