How to choose the precise dispensing needle of dispensing machine?

How to choose the precision dispensing needle of dispensing machine?

The dispensing machine is one of the essential equipment in packaging equipment, and what factors will affect the dispensing quality of the dispensing machine in production? There is no doubt that friends who have been in contact with the dispensing machine know that a series of factors such as the size of the dispensing amount, the size of the needle, the distance between the needle and the working surface, the dispensing pressure, the viscosity of the glue, the glue temperature, the curing temperature curve and the bubbles in the glue will affect the dispensing quality of the dispensing machine. Therefore, it can be seen that the selection of precision dispensing needle of the dispensing machine is very important! So, how to choose the precision dispensing needle of dispensing machine? Next, the technicians of Junze technology will tell you:

1、 Dispensing needles of dispensing machine can be divided into the following categories:

1. Teflon needle, product features - prevent instant dry glue from blocking in the needle tube, and have better flow control for thin liquid;

2. Oblique needle, product features - suitable for large flow or medium and high viscosity fluids, and can shield UV light;

3. Plastic seat straight stainless steel needle, product features - the inner wall of the needle tube is closely polished without burrs, and the needle tip is tight to ensure continuous dispensing effect;

4. All stainless steel needle;

5. Flexible needle, product features - deep into complex working face to prevent scratching;

6. Plastic seat angle stainless steel needle.

2、 The precision dispensing needle of the dispensing machine needs to be selected according to the nature of the glue:

1. Aqueous liquid: small dispensing needle, small pressure, set time as required;

2. Thick glue: inclined dispensing needle, high pressure, set time as required;

3. Small spot: small dispensing needle, low pressure, short time;

4. Large point: large needle, high pressure, long time.

3、 The precision dispensing needle of the dispensing machine needs to be selected according to the type of glue:

UV glue: it is recommended to use amber syringe, white piston and inclined needle (which can block ultraviolet rays).

Instant glue: for water-based instant glue, use a stable piston and Teflon lined metal needle. For thick instant glue, use a conical inclined needle. If flexibility is required, use a PP needle.

Anaerobic glue: 10cc syringe and white PE universal piston are used.

UV curable adhesive: use black opaque syringe and white piston, which can block ultraviolet rays.

Sealant and paste fluid: if the rebound of white piston is serious, please use stable movable type and inclined needle.

After selecting the most appropriate dispensing machine, dispensing syringe and piston, the selection of dispensing machine needle will also determine the dispensing effect. What kind of glue to match and what kind of dispensing needle to choose is still very important. You can't match it at will, otherwise it will bring unnecessary trouble to our dispensing work and directly affect the dispensing quality of the dispensing machine!