How to prevent bubbles from the dispensing needle?

How to prevent bubbles from the dispensing needle?

Does the dispensing machine appear to exude, drip or form drops at the end of the dispensing needle? If all the dispensing machine does not appear this kind of situation and the Settings are correct, this may be the result of air retention. In order to prevent air from affecting the consistency of the glue point, please use the following method when using the glue needle for dispensing:

1. For medium and low viscosity fluids, be sure to hold the Angle cylinder

If you are refilling the dispensing needle with a medium to low viscosity fluid, be sure to hold the needle at an Angle to prevent bubbles from forming. In addition, whatever the viscosity of the fluid? It can only be filled to 2/3 of the volume of the syringe. When dispensing glue, be sure to use a piston to help remove the air from the fluid.

Dispensing needle useful tips: fill the syringe and insert the piston. Hold the syringe so that the head plug is facing up, then flick the syringe. The bubble will rise to the top. Next, remove the head plug and slowly push the piston upward to drain the large air bubbles.

2. For medium to high viscosity fluids, use a centrifuge

When the viscous fluid contains residual air, the bubbles will compress and expand after each dispensing cycle. Exudation will occur, which is the main reason for the inconsistency of glue spots. The use of centrifuges to discharge air is a better solution when dispensing.

Keep in mind that pre-packaged fluids are generally treated by defoaming. Therefore, it may be more advantageous if the dispensing needle is filled in the factory. Centrifuges can be used to debubble the syringes that you dispense in the field.

Store the dispensing needle upright (head stopper down) in such a way that after overnight the bubbles will rise to the top. For some fluids, you may need to pinch the needle where the piston is and push the piston down with the end of the pencil to expel all the rising air.

A useful tip: The pre-packed fluid in the dispensing needle is not always used with the piston appropriate for your application. This will lead to inconsistent glue spots. There are many types of pistons available to optimize each unique dispensing process. Make sure the installed piston is suitable for your application. Another tip: Keep your trachea less than 5 feet long, which reduces the risk of bubbles. Low another way.