SMT Stencil

Apart from all kinds of PCBs, icchip7 additionally manufactures solder paste stencils to satisfy SMT demands.

Stencils, additionally called SMT stencils, play a crucial function in transferring accurate amount of solder paste to fix positions on bare circuit card prepared for assembly. To put it simply, stencils can quick and efficiently ensure one of the most exact solder paste amount and optimal electric connection. With solder patterns, it is feasible to make use of metal squeegee blades to apply solder paste conveniently over the openings on PCBs and make pattern to be well lined up with the surface of the advanced motherboard.

According to SMT stencil manufacturing technologies, we give 2 sorts of patterns: laser-cut patterns and chemical-etch stencils.

Laser-cut Stencils

The openings are lasered on 100% stainless-steel. Usually speaking, this type of pattern can be created with premium quality and a high degree of accuracy within a short time.

• Advantages: high precision; hardly affected by unbiased aspects; trapezoid opening advantageous for demoulding; suitable for accurate cutting; practical price;

• Disadvantages: relative low manufacturing speed.

Chemical-etch Stencil

The openings are etched into the metal making use of acid. Normally this sort of stencil uses better protection on material mood and hardness.

• Advantages: single formation; relatively high manufacturing rate; low cost;

• Disadvantages: tending to create sand clock form or big openings; countless manufacturing stages and building up mistakes; inappropriate for great pitch stencils; negative for environmental protection.

How to Determine the Size of the Stencil?

PCB stencil size is made up by 2 parts: internal size and total size. Inner dimension is the size compatible keeping that of PCB ready to be set up while general size describes the size compatible with printer criterion restriction. As long as both dimensions are properly made, pattern will certainly have the ability to make complete use of its functions.

Internal size of stencil can be figured out conforming to the following rule:
• Width of Framed Stencil = width of PCB + 100mm while its Length = length of PCB + 100mm
• Width of Frameless stencil = width of PCB + 200mm while its Length = length of PCB + 200mm

As an example, if one motherboard dimension is 50 * 50mm, after that the size of its framed pattern should be around 150 * 150mm and the dimension of its frameless pattern need to be about 250 * 250 mm.

It's very easy to keep in mind and run so it benefited hands-on solder paste printing in SMT setting up before the advent of automated printer. It can be said that different PCB dimensions cause generations of various internal sizes of pattern.

When it pertains to automated solder paste printer, nevertheless, it's relatively solid. Overall size of stencil has to be identified by parameter limit of the equipment, that is, printer, since stencil needs to work within the variety of printer with a frame. Various printers include different specification regulations. Regarding icchip7 is concerned, the pattern size suitable with our printer can be either 650mm * 650mm or 736mm * 736mm.

PCB designers have to focus on internal size of stencil, they don't need to respect its overall size considering that it is usually established by the specifications of printer in your contract assembler workshop.

How to Quote Stencils

Below at icchip7, you can send your name and your email and the circuit rules information. Then we will contact with you asap and inform you the price; If you are satisfied with the cost, we will send you the PI file and afterwards you can make the payment.We will produce the goods for you at once after we get your down payment.