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Overview
A 2-1
E 2000 Nordson Corporation
All rights reserved
41-3000
Issued 11/00
A2EN-02-[3-OVER]–2
Section A 2
Overview
The Series 3100 melter is the main component of the hot melt system.
The melter liquefies the adhesive, maintains it at the setpoint (operating)
temperatures, and pumps it through hoses to dispensing guns. The guns
apply the adhesive to the surface of the product or package. The guns
may be automatically operated, by an air supply or an electric gun driver,
or hand-operated. Most automatic gun systems also use a timer, pattern
controller, or programmable logic controller (PLC) to trigger the guns.
Figure A 2-1 shows a typical Series 3100 hot melt system.
The tank, hoses, and guns are electrically heated: the tank by a cast-in
heater element, the hoses by a spirally wound heating element, and the
guns by a cartridge heater. The temperatures of the tank, hoses, and
guns are individually monitored and controlled using a
temperature-sensing device called a resistance temperature
detector (RTD).
Series 3100 melters can be used to melt and pump almost any
thermoplastic adhesive or similar material that can be liquified and
extruded at temperatures below 218 _C (425 _F). The melters are not
intended for use with polyurethane-reactive (PUR) adhesives because
these adhesives require unique systems designed to prevent curing of
the adhesive inside the dispensing equipment. Series 3100 melters
should be used only as described in this manual.
Fig. A 2-1 3100 Series Hot Melt
System
1. Melter
2. Control panel
3. Hose
4. Air-operated gun
5. Timer, pattern controller, or gun
driver
1. Introduction
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