Unlock Precision: How Automatic Solder Paste Printers Achieve Accurate Printing?

Solder paste is a soldering material containing fine particles, usually composed of tin, lead and other additives, which is mainly used in reflow oven and SMT.

The accuracy of solder paste printing is directly related to the quality of the solder joint, which in turn affects the overall performance and reliability of the product. Especially in the field of high-density, high-precision SMT placement processing, the quality of the solder paste printing problem is more prominent, common printing defects include insufficient tin, collapse, positional offset, pull the tip and uneven thickness.

Automatic solder paste printer how to ensure high precision printing?

NeoDen SMT production line

Intelligent programmable settings, two independent direct motor-driven squeegee, built-in precise pressure control system.

The platform height is automatically calibrated according to the PCB thickness setting, intelligent and fast, simple and reliable structure.

Four-way light source adjustable, adjustable light source intensity, light uniformity, the collection of images more perfect. Can be well recognized (including uneven Mark points), adapted to tin-plated, copper-plated Gold-plated, spray tin, FPC and other types of different colors of PCB.

The scraper Y-axis servo motor with silk rod drive, higher precision, more stable operation, extended service life, providing customers with a good printing control platform.

The efficient algorithm of fully automatic solder paste printer can realize uniform and accurate transfer of solder paste on PCB pad by precisely controlling the moving trajectory and speed of nozzle.

This precise motion control greatly reduces deviation and ensures that each solder paste application meets the design requirements, thus enhancing soldering reliability.

The fully automatic solder paste printer is equipped with a variety of sensors and detection systems:

Pressure Sensor: Monitors the pressure and flow of the solder paste to ensure stable nozzle pressure, avoiding under- or over-paste caused by uneven pressure.

Visual Inspection System: Utilizes high-resolution cameras and image recognition technology to monitor the PCB printing area in real time. The system can detect whether the distribution of solder paste is even, whether the position is shifted, and whether there are defects (e.g. leakage, beads, etc.).

Return report: The detection results are automatically transmitted to the control center, and in case of abnormality, an alarm will be issued immediately or the parameters will be adjusted automatically.

Key Parameter Record: The equipment will record the key parameters such as time, pressure, speed, temperature, etc. for each printing, forming a detailed production file.

Data analysis: Using big data technology, these parameters are analyzed in depth to find potential factors that affect printing quality.

Continuous optimization: Based on actual operation data, optimize process parameters and adjust machine settings so as to continuously improve printing accuracy and consistency.

Early warning system: Through historical data analysis, effectively predict possible equipment failures or deviations, carry out maintenance in advance, reduce downtime and improve production efficiency.

High viscosity solder paste is not easy to flow, suitable for fine pitch pad printing. Low-viscosity solder paste has good fluidity, suitable for larger pad printing. At the same time, the paste particle size should be moderate, too large particles may lead to paste in the stencil opening blockage, affecting the printing efficiency and quality.

Faster printing speed can improve productivity, but may lead to insufficient filling of solder paste. Slower printing speed can ensure that the paste filling quality, but will reduce production efficiency. Therefore, the need to ensure the quality of printing under the premise of maximizing the printing speed.

Too high or too low a temperature may lead to changes in the viscosity of the paste, affecting its printing performance. And too high humidity may lead to solder paste moisture absorption, tin beads and other problems. General requirements for the printing shop temperature control at 20 - 25 ℃, humidity control at 40% - 60%.

1. Operator training: Operators are trained regularly to ensure that they are familiar with the performance and operation of the equipment. During operation, the equipment should be operated in accordance with the equipment manual and process requirements to avoid damage to the equipment due to misoperation.

2. Equipment maintenance: According to the requirements of the equipment manual, regular maintenance of the equipment. This includes replacing worn parts, adjusting equipment parameters, etc., to ensure that the equipment operates in the best condition.

3. Record data and analysis: Record the operating conditions and maintenance of the equipment, regularly analyze the data, find out the potential problems of the equipment and solve them in time.

Problem-1: Coordinate offset: When the coordinates of the printing machine are set inaccurately, the solder paste cannot be accurately printed to the expected position.
Solution: Recalibrate and adjust the coordinate system of the printing machine to ensure that the coordinates are set accurately.

Problem-2: Poor identification of positioning points: Fully automated solder paste printers rely on the vision system to identify the positioning points, if the identification is inaccurate or poor, it will lead to printing offset.
Solution: Check and debug the vision system of the automatic solder paste printing machine to ensure that the positioning point can be accurately recognized. Poor recognition, you can re-write the positioning point coordinates or make other necessary adjustments.

Problem-3: Loose fixing of stencil: Poor fixing of stencil will produce offset in the printing process.
Solution: Check the fixing of the stencil to ensure that it is firm and not loose. If necessary, you can re-fix or replace the stencil.

Problem-4: Unstable PCB stop: If the positioning jig, pallet jig or vacuum system cannot fix the PCB effectively, it will lead to offset.
Solution: Check the positioning fixtures, palletizing fixtures and vacuum system of the PCB. Adjust or replace these parts if necessary.

Problem-5: The camera touches the PCB: The position of the camera is not set properly, resulting in the printing process touches the PCB, thus causing offset.
Solution: The position of the camera can be adjusted or the camera cover can be set.

Improve the accuracy of automatic solder paste printer need to consider the equipment, process, materials and vision system and other aspects, we can through the comprehensive optimization and adjustment, you can achieve higher printing accuracy and better printing results, so as to protect the quality of the product and promote the upgrading of the manufacturing industry.

factory

Zhejiang NeoDen Technology Co., LTD., founded in 2010, is a professional manufacturer specialized in pick and place machine, reflow oven, stencil printing machine, SMT production line and other SMT Products. We have our own R & D team and own factory, taking advantage of our own rich experienced R&D, well trained production, won great reputation from the world wide customers.

We are in a good position not only to supply you high quality pnp machine, but also the excellent after sales service.

Well-trained engineers will offer you any technical support.

10 engineers powerful after-sales service team can respond customers queries and enquiries within 8 hours.

Professional solutions can be offered within 24 hours both workday and holidays.