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Analysis of dispensing protection quality of PCB solder joint
Date:2022-04-26

Nowadays, with the development of science and technology, the application scope of dispensing machine is becoming wider and wider, and industrial production has entered the era of automation! While dispensing machines are widely used, the dispensing defect rate is increasing. What is the reason for this?

1、 The control of dispensing quantity is the key to the control of dispensing quantity of dispensing machine, which directly affects the dispensing quality of dispensing machine. According to personal experience, the amount of glue dispensing cannot exceed half of the spacing between solder joints. You can use this standard according to the actual situation.

2、 Control of dispensing pressure
When the pressure of the dispenser is high, the glue output of the dispenser is large. When the pressure of the dispenser is low, the glue output of the dispenser is small. We should make adjustments according to the specific characteristics of the dispenser, indoor temperature and dispensing environment.

3、 Selection of dispensing machine needle
The choice of the dispenser pillow is also an important factor affecting the dispensing quality of the dispenser. In this regard, it is reminded that the diameter of the dispenser needle should be controlled at about half of the dispensing volume diameter as far as possible.

4、 Adjustment of glue temperature
Generally speaking, the storage environment of epoxy resin glue should be about 0~5 degrees Celsius, and the use temperature should be about 23 degrees Celsius. Take it out of the storage room about half an hour before use, so that the glue can better adapt to the surrounding temperature and avoid the phenomenon of glue wiredrawing during use.

5、 Control of glue viscosity
The higher the viscosity of the glue, the smaller the glue point will become, and even the phenomenon of wire drawing will appear; If the viscosity is too low, the formed glue points will expand, and even dip the pad, so it is critical to control the viscosity of the glue. We should be careful when using the dispenser.

6、 The glue shall not be intervened by air
The glue must not be intervened by air. If there is air, it may be empty, which will seriously affect the actual dispensing effect.

The dispensing machine is composed of software and hardware. Although the automation technology of the dispensing machine is very advanced, it is not human after all and cannot be satisfied with all aspects. Therefore, we must fully consider these six factors when using the dispenser for dispensing, which will greatly improve the product quality and the production efficiency of the enterprise.