Various technologies of contact dispensing affecting dispensing quality

1.Dispensing pressure dispensing syringe、

The dispensing equipment or glue gun provides a certain pressure to the needle cylinder to ensure glue supply. The pressure determines the glue supply and glue outflow speed. Too much pressure is easy to cause glue overflow and too much glue; If the pressure is too small, intermittent Dispensing nozzle and leakage will occur, resulting in product defects. The pressure shall be selected according to the nature of glue and working ambient temperature; High ambient temperature will reduce the viscosity and improve the fluidity of the glue. At this time, it is necessary to reduce the pressure value, and vice versa.

2. Dispensing volume dispensing syringe

According to work experience, the diameter of glue point should be half of the product spacing, so as to ensure that there is enough glue to bond the components and avoid excessive glue. The Dispensing nozzle

2.1 the dispensing time plays a certain role in the dispensing amount. In practice, the dispensing time should be selected according to the production situation (room temperature, glue viscosity, etc.).

2.2 the size of the needle plays a certain role in the dispensing amount. In practical work, the inner diameter of the needle should be about 1 / 2 of the diameter of the dispensing point. In the dispensing process, the dispensing needle should be selected according to the product size. Different needles should be selected for products with different sizes, which can not only ensure the glue dot quality, but also improve the production efficiency. The Dispensing nozzle

2.3 the correct needle shall be selected for special glue, such as instant glue. For water-based instant glue, safety piston and Teflon lined metal needle shall be used. For thick instant glue, conical inclined needle shall be used. If flexibility is required, PP needle shall be used. If the needle is improperly selected, problems of varying degrees will also occur in the process of use. The Dispensing nozzle

3. Bubble

The problem of bubbles has always existed and can not be solved in many projects, but the glue must not have bubbles. A small bubble will cause the production process: there will be insufficient time and space for dispensing or insufficient glue, and there will be rebound at the same time; Thus, the products need to be reworked, scrapped or discontinued, which greatly affects the quality and output of the products. The Dispensing nozzle