solder paste printing

Depth analysis: What are the factors that affect the thickness of SMT press solder paste printing?

Depth analysis: What are the factors that affect the thickness of SMT press solder paste printing?
In the solder paste printing machine, sometimes the printed solder paste is very thin, which causes the product to fall off due to too little solder paste after the furnace is finished. So how is this phenomenon caused? Below I will analyze some specific reasons for everyone.

First, the quality of the steel plate — stencil printing is contact printing, so the stencil thickness and opening size determine the amount of solder paste printing, too much solder paste will produce bridging, too little solder paste will occur solder deficiency or solder joint, template The shape of the opening and the smoothness of the opening also affect the quality of the release. The template opening must have the bell mouth down, otherwise the solder paste will be taken from the chamfered corner of the bell when the mold is released. DEK accessories

solder paste printing
solder paste printing
solder paste printing
solder paste printing

Second, the printing process parameters — solder paste is a thixotropic fluid, with viscosity, when the scraper moves forward at a certain speed and angle, push the solder paste to roll in front of the scraper, the need to inject solder paste into the mesh or leak hole The pressure, the viscous friction of the solder paste causes the solder paste to shear at the intersection of the squeegee and the stencil, and the shear force reduces the viscosity of the solder paste, which facilitates the smooth injection of the solder paste into the mesh. There is a certain constraint between the speed of the blade, the pressure of the blade, the angle of the blade and the stencil, and the viscosity of the solder paste. Therefore, only by properly controlling these parameters can the printing quality of the solder paste be ensured.

sp-1008-automatic-screen-printer-for-smt-pcb-assembly

Semi-Auto Screen Printer SP-1200 for 1.2M LED assembly.

Semi-Auto Screen Printer SP-1200 for 1.2M LED assembly.
Semi-Auto Screen Printer SP-1200 for 1.2M LED assembly.

 

 

Third, contact printing blade pressure:

1 blade pressure 10~20 depends on the size of the press or template installation;

2 The blade pressure should be sufficient to scrape the template;

3 The blade pressure is too high, which may result in:

  1. Speed ​​up the wear of the template;

2, printing causes solder paste pattern adhesion;

  1. The solder paste is hollow;
  2. The solder paste is pressed out from the reverse side of the template to cause the solder ball.

Fourth, the contact printing blade speed:

1 fine pitch (12-20mil0.5-1.5 inches / sec (13-38mm /

2 custom pitch (20-50mil1.5-4.5 inches / sec (38-115mm /

3 solder paste viscosity will have a certain impact on the speed of the scraper

4 reduce the speed of the blade will increase the thickness of the solder paste printing

5 template thickness increases, scraper speed should be reduced accordingly

6 printing too fast is easy to cause insufficient solder paste

 

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Full Line SMT Solution: Semi-Auto Screen Printer

ONE STOP: Full Line SMT

Stage 1: Semi-Auto Screen Printer

Full Line SMT Solution: Semi-Auto Screen Printer

What is a One-Stop SMT solution? One-Stop SMT, Full Line Solutions can guarantee your company more profits by cutting down on manufacturing costs, labor, constantly increasing importation taxes, making you an industry leader and ultimately providing you more control of your product.

High End LED Lighting Full SMT Line
Requiring only 12.5 M in length, here’s what a Full SMT Line-up consists of:
> Semi-Auto screen printer  > Buffer conveyor > Pick and place > Conveyor > Reflow Oven > Work table
SP- 1200 Semi- Auto Screen Printer

Full Line SMT Solution: Semi-Auto Screen Printer
Features:
  • Adopts SMC rail and Panasonic speed control motor drive steel squeegee base to ensure printing steady
  • The Squeegee base can be uplifted 45 degrees, easy to disassemble the squeegee and clean the screen
  • The printing base can be move front and rear, and fixed to ensure perfect printing effect
  • The printing table has groove and location pin, suited forth single and double-sided board production
  • Adopts X, Y, Z axes to align the board by using arm (screen stencil) and printing table
  • Microcomputer control equipped with LCD
  • User-Friendly Interface with counting function

 

CLICK HERE FOR MORE INFORMATION
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S-1200-LV : The whole LED production line in India

In Oct to Nov, 2015
Our engineers came to Indian customers factory for installing, and training.

1.We sold the whole SMT LED production line to our India customer.This scheme is currently the only one from us, only we provide. Cost-effective. Start from about $50000, ROI less than half a year.

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2. Our professional engineers train customer engineers how to install and operate machine with technology guide, train customer engineer until they know it completely,let you no need any worry .

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3. Customers to use our production line to produce the first board .

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4.One stop solution :
1, Reduce procurement cost, no need to evaluat many other suppliers ;
2, More high-quality after-sales service, one supplier is enough ;
3, Focus on the whole line capacity, quality and efficiency improvement.