Before using the dispensing machine, you must fully grasp the knowledge of the operation of the dispensing machine, and then operate the equipment. Check whether the power supply and voltage are stable before starting the machine. After starting the machine, pay attention to whether the machine makes abnormal sound. If so, turn off the machine immediately and check the problem before starting the machine. In order to help you better ensure product quality and improve production efficiency, the following is to talk about the five points of knowledge of the dispensing machine.

　　According to the working experience, the diameter of the glue spot should be half of the pad spacing, and the diameter of the glue spot after installation should be 1.5 times of the diameter of the glue spot. In this way, we can ensure that there is enough glue to bond the components and avoid excessive glue soaking into the pads.

　　Dispensing Pressure (Back Pressure)

　　Too much back pressure can easily lead to overflow and excessive glue volume; if the pressure is too low, intermittent dispensing and leakage will occur, leading to defects. The pressure should be selected according to the same glue quality and working environment temperature. If the environment is high, the viscosity of the glue will decrease and the fluidity will increase. In this case, the back pressure needs to be reduced to ensure the supply of glue and vice versa.

　　Dispensing needle size

　　In fact, the inner diameter of the dispensing needle should be 1/2 of the diameter of the distribution point. in the dispensing process, the dispensing needle should be selected according to the size of the pads on the PCB: for example, the size of the pads of 0805 and 1206 is not a big difference, you can choose the same needle, but a big difference in the pads should be selected from different needles, so as to ensure that the quality of the point of dispensing, but also to improve production efficiency.

　　The distance between the dispensing needle and the printed circuit board

　　Different automatic dispensers use different needles, some of which have some degree of stopping. At the beginning of each job, the distance between the needle and the PCB should be calibrated, that is, the Z-axis height calibration.

　　Glue Temperature

　　Epoxy glue should normally be stored in a refrigerator at 0-5 and should be removed 1/2 hour in advance so that the glue is fully at working temperature. The working temperature of the glue should be 23-25; the temperature has a great influence on the viscosity of the glue. If the temperature is too low, the glue point will become very small, and the phenomenon of pulling will occur. The temperature difference will cause the change of dispensing amount. Therefore, the environment temperature should be controlled. At the same time, the temperature of the environment should be ensured. If the humidity is low, the glue spot is easy to dry, affecting the bonding force.

        The above is the introduction of the five points of the dispensing machine dispensing knowledge, before using the dispensing machine, you must fully grasp the knowledge of the operation of the dispensing machine, and then operate the equipment. Check whether the power supply and voltage are stable before starting the machine. After starting the machine, pay attention to whether the machine makes abnormal sounds. If so, turn off the machine immediately and check the problem before starting the machine. If there are other related problems, please feel free to come and consult us.