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The use of a wide range of plastic buttons, good plastic drops not only rely on the quality of plastic. For the pressure-time syringe drop method, many machine-related factors influence the dripability and the formation of dots. The inner diameter of the tip is critical to the formation of the dots and must be much smaller than the diameter of the dots on the plate. As a rule, the ratio should be 2:1. A 0.7-0.9mm dot requires a 0.4mm ID; a 0.5-0.6mm dot requires a 0.3mm ID. Equipment manufacturers often provide technical specifications and operating instructions to produce the desired size and shape of the dots.
Temperature will affect viscosity and dot shape. Most modern plastic dispensers rely on the temperature control device on the needle or chamber to keep the temperature of the gel above room temperature. However, the dot profile may be damaged. If the PCB temperature is increased from the previous process, the viscosity and dot shape will be affected.
The distance between the PCB and the nozzle, or the height of the stopper, controls the height of the glue dot. It must be suitable for the amount of plastic drops and needle ID. For a given amount of glue, the ratio of glue height to width will increase with the height of the stopper. Typically, the maximum stopper height is one-half of the tip ID; beyond this point, discontinuity drops and pulls occur.
The high-speed equipment use pressure can be started periodically before the needle tip is in place. The retreat speed of the needle tip, the withdrawal height and the delay between the blister and withdrawal of the needle all affect the shape of the glue spot and the pull wire.
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