1, the size of the glue

According to experience, the size of the adhesive dot diameter should be half of the product spacing. This will ensure that there is enough glue to bond the components and avoid too much glue. The amount of glue is determined by the length of time. In practice, the time of glue should be selected according to the production situation(room temperature, glue viscosity, etc.).

2, glue pressure

The glue machine equipment provides a certain pressure for the glue valve to ensure the glue supply. The pressure size determines the amount of glue supply and the glue outflow speed. Too much pressure can easily cause glue overflow and too much glue; If the pressure is too small, there will be a bit of glue break and leakage, resulting in product defects. Pressure should be selected according to the nature of the glue and the temperature of the working environment. High ambient temperature will make the glue viscosity smaller and fluidity better. At this time, the pressure value needs to be lowered, and vice versa.

3, needle size

In the actual work, the size of the needle inner diameter should be about 1/2 of the diameter of the glue point. During the glue point process, the glue point needle should be selected according to the product size. Different size of products to choose different needles, this can not only ensure the quality of glue, but also improve production efficiency.

4, the distance between the needle and the work surface

Different glue machines use different needles, and some needles have a certain degree of stop. Calibration of the distance between the needle and the face, i.e. the height of the Z axis, should be done before each work begins.

5, glue viscosity

The viscosity of the glue directly affects the quality of the glue. If the viscosity is large, the glue will become smaller and even pull the wire; The viscosity is small, the glue point will become larger, and then may percolate the product. In the process of glue, the glue of different viscosity is treated, and reasonable pressure and glue speed are selected.

6, glue temperature

In general, epoxy resin glue should be stored in a refrigerator with 0 to 5 °C. It should be taken out half an hour in advance of use so that the glue temperature is consistent with the working environment. The temperature of use of glue should be 23 °C ~ 25 °C; The ambient temperature has a great influence on the viscosity of the glue, the temperature decreases, the viscosity increases, and the flow rate of the adhesive decreases accordingly, making it easier to pull the wire. Under the same conditions as the other conditions, the difference in ambient temperature of 5 °C will cause a change in the size of the rubber volume of 50 <UNK>, so the ambient temperature should be controlled. At the same time, the temperature of the environment should also be guaranteed. The temperature is too high and the adhesive point is easily dried, affecting the adhesion force.

7, cure temperature curve

For the curing of glue, the general manufacturer has given the temperature curve. In practice, it is necessary to use a higher temperature as far as possible to solidify the glue so that it has sufficient strength after solidification.

8, bubbles

There must be no bubbles in the glue. A small bubble can cause many products to lack glue; Each time the rubber tube is replaced halfway, the air at the connection should be emptied to prevent the occurrence of air strikes.

9, require special settings of fluid

Instantaneous glue: For waterborne instantaneous glue, use a safe piston and Teflon lined metal needle. For dense instant glue, use a conical oblique needle, and use a PP needle if need to be scratched.

UV glue: Use an amber syringe, a white piston and an oblique needle(which can cover ultraviolet light). If you use other types of needles, please order a needle that can cover ultraviolet light.

Photocuring glue: use black opaque needle to avoid sensitivity.

Anaerobic glue: use 10CC syringe and white PE universal piston.

Sealant and paste fluid: If the use of white piston rebound seriously, please use the safety type, use oblique needle.