1. Glue dispenser - Glue valve dripping


This situation often occurs after the rubber valve is closed.


95% of this situation is caused by the use of a needle with a small caliber.


A needle that is too small can affect the flow of liquid and cause back pressure, resulting in the phenomenon of dripping shortly after the rubber valve is closed. A needle that is too small can also affect the exhaust bubble action of the rubber valve when it starts to use. Simply replacing a larger needle can solve this problem.


The conical inclined needle produces less back pressure and allows for smooth liquid flow.


After the glue valve is closed, the air in the liquid will cause dripping and leakage. It is recommended to remove the air in the liquid in advance, or use glue that is not prone to bubbles, or centrifuge the glue before use.




2. Glue dispenser - inconsistent glue size


When the adhesive output is inconsistent, it is mainly caused by the unstable pressure of the pressure cylinder or air that stores the fluid.


The intake pressure regulating gauge should be set at 10 to 15 psi lower than the low pressure in the factory. The pressure used in the pressure cylinder should be above the middle of the regulating gauge, and the use of pressure between the low pressure part of the pressure gauge should be avoided.


The control pressure of the glue valve should be reduced by more than 60psi to ensure stable glue output.


After zui, the adhesive release time should be checked. If it is less than 15/1000 seconds, it will cause unstable adhesive release. The longer the adhesive release time, the more stable the adhesive release.




3. Glue dispenser - flow rate too slow


If the flow rate is too slow, the pipeline should be changed from 1/4 "to 3/8".


If the pipeline is not needed, it should be as short as possible.


4. Glue dispenser - Bubbles in fluid


If the fluid pressure is too high and the valve opening time is too short, it is possible to infiltrate air into the liquid. The solution is to reduce the fluid pressure and use a conical inclined needle.


5. Glue filling machine - instant glue (quick drying glue) is blocked on the joint and pipeline of the glue valve


This situation is mainly caused by excessive moisture or reused instant glue. It is necessary to ensure the use of fresh instant glue, thoroughly clean the pipeline with Aceton acetone without moisture, and ensure that the air used is completely dry. A filter should be installed between the air pressure and the glue valve system in the factory. If the above methods are still ineffective, nitrogen should be used


6. Gluing machine - UV adhesive (UV curing adhesive)


Confirm the use of black pipes.


Do not directly add UV glue to the old UV glue in the pressure cylinder. First, release the original UV glue, and then pour it into the empty pressure cylinder. The UV glue in the pressure cylinder often produces bubbles after a period of time, causing unstable glue production.


7. Gluing machine - needle


Generally speaking, needles smaller than size 20 may cause air problems - dripping or sagging. Try to use larger general metal needles or tapered inclined needles, and avoid using flexible or Teflon needles.


8. Gluing machine - epoxy resin cleaning


If possible, try to automatically clean every shift using a storage pressure cylinder with a general toluene solvent, and the more frequent the cleaning, the better.