Glue dispensing guidelines and recommended practice

AN4351

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After the syringe has reached ambient room temperature, it is ready for use:

•

Remove the back end cap from the syringe.

For setting up the dispensing quantity of a dispenser, it is recommended to use a scale (0.1

mg) function rather than using the time function of the time-pressure dispenser.

Due to the very small deposited quantity, it is necessary first to weigh a minimum of 30 dots

to calculate the weight average. This value must be kept in reference.

Various silver filled conductive adhesive have been evaluated, please find here below the

main dispensing parameters used (refer to Table 1).

2.3

Preparation of dispensing equipment

2.3.1

Input parameters

•

Pressure

•

Dispense time in milliseconds: ms.

•

Internal diameter of needle

2.3.2

Relation between time pressure and deposit quantity

A high pressure with a short time increases flow (debit), whereas low pressure during a long

time increases precision.

The adjustment of the pressure should always be done in an increasing step. If a lower

pressure is needed, it must be reduced well below the desired pressure and then increased

to the desired level.

2.3.3

Needle choice

It is recommended using 6.3 mm needle length instead of a 12.7 mm needle length. It is not

recommended using conic needles due to the low viscosity of glue materials.

2.3.4

For semi-automatic mode

Manual operation with time pressure dispenser:

•

The needle must be inclined at an angle between 45° to 80°.

•

The needle must be in contact with the surface during dispensing.

•

Do not move the needle while releasing the glue.

•

Lift up the needle perpendicularly after dispensing the glue.

Table 1. Input parameters

Gauge

Inside

diameter

Color

code

Length

Dispense

time (ms)

Pressure

(Bars)

Total

weight 30

deposits

Weight

average

Silver filled

conductive

adhesive

Inch

mm

25

0.010

0.25

Red

6.35

150 to 300

2

4.1 mg

0.14 mg

QMI 516 IE Henkel

600 to 800

1

2.2 mg

0.07 mg

PU 1000 Polytec

160

2

4.1 mg

0.14 mg

ACE 40810 Protavic