Dispensing Machine Manufacturers Tell You What Factors Will Affect The Dispensing Effect
The use of automatic glue dispenser can effectively improve production efficiency, save glue, reduce product scrap rate, and improve economic benefits. However, many factories and enterprises now buy the glue dispenser back because the operators are inexperienced, which often affects the dispensing effect of the automatic glue dispenser due to some small problems in the production process.
1. Dispense amount
The amount of glue is generally controlled by the dispensing time. The longer the time, the greater the amount of glue. Under normal circumstances, it is more appropriate to control the glue point diameter to one-half of the product spacing, which can not only avoid too much glue, but also ensure that there is enough glue to bond the product components. Different viscosities of different glues will also affect the amount of glue, so in practical applications, it is also necessary to make corresponding adjustments according to the actual situation and choose the appropriate dispensing time.
2. Air supply pressure and running speed
The higher the air pressure of the glue dispenser, the faster the glue flows, and the glue volume is easy to overflow. The air pressure is small, the glue flow is slow, and the glue quantity is too small, and it is easy to cause intermittent dispensing or leakage. On the other hand, the running speed is the opposite. If the speed is too slow, the amount of glue will be too much. If the running speed is too fast, it may be intermittent or leaking. Therefore, it is very important to adjust the operating speed according to different air pressures, and these should be adjusted according to the actual situation in the application process.
3. Dispensing needle
The needle of the automatic dispensing machine usually needs to select a needle whose inner diameter is about 1/2 of the diameter of the glue point. During the dispensing process, the dispensing needle should be selected according to the size of the product. At the same time, different glues have different requirements for the needle. Instant glue: use a safety piston and a Teflon (Teflon) lined metal needle for water-based instant glue, and use a tapered oblique needle for thick instant glue. If flexibility is required, use PP needles; UV glue: use amber syringes, white pistons and oblique needles (which can block ultraviolet rays). If you use other types of needles, please order needles that can block ultraviolet rays; light curing glue: use black opaque Syringe, avoid exposure to light; anaerobic glue: use 10CC syringe and white PE universal piston; sealant and paste fluid: if the rebound of the white piston is serious, please use the safety type instead of the inclined needle.
4. The distance between the needle and the working surface
Different glues, different products, and different dispensing machines use different needles. Some needles have a certain degree of stop (the stop refers to relative movement). It is very important to grasp the dispensing distance. , so it is necessary to calibrate the distance between the needle and the working surface before each work.
5. Glue
In addition to the above factors of the dispensing itself, the viscosity of the glue will also directly affect the dispensing quality of the automatic dispensing machine. Too little viscosity may bleed the product. At the same time, the influence of the environment on the glue is also relatively large. Under normal circumstances, the temperature of the glue should be 23 ° C ~ 25 ° C. If the temperature is too low, the viscosity of the glue will increase, otherwise, the viscosity will decrease. The glue curing temperature curve has been given by the manufacturer. In practice, a higher temperature should be used for curing, so that the glue has sufficient strength after curing.
6. Bubbles
The glue must be absolutely guaranteed to have no air bubbles. A small air bubble will lead to defective products or many products without glue. Therefore, every time the hose is replaced, the air at the connection must be evacuated to prevent the phenomenon of empty hitting.
