User guide

AccuJet t Dispenser
13
E 1998 Nordson Corporation
All rights reserved
107 142B
Issued 4/98
Manual 12-34
See Figure 1. The AccuJet dispenser applies adhesive dots on circuit
boards before surface-mounted electrical components are installed.
See Figure 2. A syringe (2) of adhesive connects to the dispenser.
Adhesive flows from the syringe at 0.35–2.1 bar (5–30 psi) and into the
fluid chamber. The heater (7) warms the adhesive to 40 to 55 _C
(104–131 _F) to reduce viscosity and improve flow characteristics. Air
pushes on the dispenser piston to retract the ball from the seat and
compress the spring. Adhesive fills the space left by the ball. When air
exhausts from the solenoid valve (8), the spring returns the ball to the
seat. The ball breaks the string of adhesive flowing through the
nozzle (6). The string of adhesive strikes the substrate and forms a dot.
Different sizes of dots can be formed by firing multiple dots on top of
each other.
The micro-adjustment assembly (3) controls piston and needle travel.
Turning the micro-adjustment
S clockwise, decreases piston travel and adhesive flow
S counterclockwise, increases piston travel and adhesive flow
1234011A
Fig. 1 AccuJet dispenser
2. Description