1. The size of the dispensing volume:
According to work experience, the size of the glue dot diameter should be half of the product spacing. This will ensure that there is sufficient glue to bond the components and avoid excessive glue. The amount of glue to be dispensed is determined by the length of time. In practice, the glue time should be selected according to the production situation (room temperature, glue viscosity, etc.).
2. Dispensing pressure:
The dispenser equipment provides a certain pressure to the needle tube (glue gun) to ensure the supply of glue. The pressure determines the amount of glue supplied and the speed of glue outflow. Too much pressure can easily cause glue overflow and excessive glue volume; too little pressure will cause intermittent glue dispensing and leaks, which will lead to product defects. The pressure should be selected according to the nature of the glue and the temperature of the working environment. High ambient temperature will reduce the viscosity of the glue and improve its fluidity. At this time, it is necessary to lower the pressure value, and vice versa.
3. Needle size:
In actual work, the inner diameter of the needle should be about 1/2 of the diameter of the dispensing dot. In the dispensing process, the dispensing needle should be selected according to the size of the product. Different needles should be selected for products with very different sizes, which can not only ensure the quality of glue dots, but also improve production efficiency.
4. The distance between the needle and the working surface:
Different dispenser equipment uses different needles, and some needles have a certain degree of stop. The distance between the needle and the working surface should be calibrated before each work starts, that is, the Z-axis height calibration.
5. Viscosity of glue:
The viscosity of the glue directly affects the quality of the glue. If the viscosity is large, the glue point will become smaller, or even drawing; if the viscosity is small, the glue point will become larger, and the product may bleed. During the glue dispensing process, choose a reasonable pressure and dispensing speed for glues of different viscosities.
