2-8
Equipment Familiarization
.
3. Giossary
Applicator.
That part of the hot melt system which is used to heat
adhesive to its required application temperature and pump it to the
hoses and guns. It consists of a tank, a pump, a filter, a distribution
manifold, and a temperature controlled heating system.
Bead Thickness. The width of an adhesive bead which has been
deposited on a substrate. The measurement is of course taken before
the bead has been flattened by adhering it to another surface. The
thickness may be adjusted in three ways: by adjusting the hydraulic
pressure of the system (increasing the pressure produces thicker
beads), by varying the speed of application, or by using a gun with a
microadjuster, like the H20 (see Section 4, Operating Insfructions).
Extrusion Gun. A spring-loaded triggering device for dispensing or
depositing adhesive. There are two basic types of gun, the manual gun,
in which the spring is actuated by a hand trigger, and the automatic, in
which the spring is actuated pneumatically. For a more detailed
description of the operation of extrusion guns, see Section 2,
Equipment Familiarization.
Hot Melt System.
The applicator, the hose(s), and the gun(s).
LED (Light Emitting Diode). A device that converts applied voltage
to light. LED’s are used to display operating conditions on the indicator
panel of the Model 2300 Applicator.
Maximum Instantaneous Pumping Rate.
The adhesive delivery
measured at the manifold outlet, with the conditions that produce
maximum flow without exceeding any operating parameter limits. The
rate in the specifications is based on an adhesive with a viscosity of
32,000 centipoise.
Service Block. One of the two main parts of a Nordson automatic
extrusion gun, the other being either a module or a cartridge,
depending upon the design of the gun. The automatic guns are
constructed so that the module or cartridge contains the spring-loaded
firing mechanism of the gun and the service block supplies the needed
air, adhesive, and heat to make the gun operate. It consists of an
aluminum block drilled with air and adhesive passages and with a
cavity for a cylindrical heater, which is referred to as a cartridge heater.
Illustration of various service blocks may be found in the parts lists for
automatic guns, Section 8.
Substrate. The material or surface upon which the adhesive is
applied.
System Melt Rate. The amount of adhesive, measured in pounds per
hour, that an applicator (including hoses and guns) can melt and pump
continuously within 10°F (5.6”C) of the set application temperature. The
measurement is based upon an adhesive with a specific heat of 0.77
BTU/lb”F (cal/g”C) at 247°F (199°C) and upon a system consisting of a
Model 2302 Applicator, two hoses (6 ft. and 8 ft.), and two H20T (RTD
temperature sensor) automatic guns.
PIN 106 701A
41-2300SP - Issued ~94
0 Nordson Corporation 1994
All Rights Reserved
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