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  • Phone: [+86-18926136913]
  • Email:sales@dahengkongjiao.com

FAQ

Do you offer oversea service?

We do not have overseas service center,but we can offer oversea service if customer required, engineer will offer face to face service. 

How dose your factory do regarding quality control?

We assure 1 year warranty for the main part,also we offer spare part for back up.
Please check with sales engineer in detail.


What are your payment terms?

Normally, 30% advance by T/T and balance paid off before delivery.

Are you a factory or trading company ?

We are a factory with SGS certified and more than 20 patents,and cooperate with different customers  coverd about 40 countries for over 15 years.


Glue dispenser always drops

Drops always happened when valve closed . The reason may be low concentration of glue , big air-pressure or large diameter of needles.

Narrow needles will effect the flow of the liquid and cause back pressure . It will lead to dropping when the valve closed . Too narrow needles will effect the drainage of air when valve start to work, but it can be solved if change suitable needles .

Conical needles with less back pressure and liquid flow smoothly .

It is better to drainage of the air advance or use no-foam glue or deaeration to avoid the air cause dropping after valve closed .

Glue dispensing not evenly

The problem cause mainly because of the storage flow pressure tank or air pressure is not stable.

Inlet pressure regulating table should be set lower 10-15psi than factory minimum pressure . The pressure in pressure tank should be set upper than the middle pressure of regulating table . It should be avoided to use the pressure lower than the middle pressure of regulating table .

Control pressure of rubber valve at least higher than 60psi to assured glue evenly .

We should check the glue output speed at last . The glue is uneven if the time less than 15/1000s , the output speed more longer , the glue dispensing will be more stable .

Slow flow velocity

It should be changed the pipe from 1/4 to 3/8 if the flow velocity too slowly .

The pipe is the shorter the better if no requirement .

Air in the fluid

Excessive fluid pressure and short valve opening time may lead to the air infiltration liquid . We can use the conical needles and reduce fluid pressure .

Instant glue (quick adhesive) blocking in valve connector and pipes.

This problem is caused by heavy moisture and recycle instant glue . We should make sure to use new instant glue and wash the pipes with dry acetone . Make sure air dry and add filter between plant air pressure and valve .

UV glue (UV curing glue )

Make sure to use black pipeline.

Don’t add new UV glue to old UV glue in pressure tank , we should drain off the old UV glue before pouring new UV glue into pressure tank because the UV glue will produce bubble after a period of time and lead to glue dispensing unevenly .


We have 15 years glue potting experience , welcome to contact us !