Description
2-5
Part 1079832_04
E 2015 Nordson Corporation
Theory of Operation
Adhesive is heated to application temperature, which is typically about
177C(350F), in a melter. The melter pumps the adhesive through a
heated hose to the applicator. The applicator then dispenses the adhesive
through dispensing modules onto a product. The type of nozzle used on the
modules determines the type of adhesive pattern produced.
The applicator requires two air supplies: one to actuate the modules
(module‐actuating air) and one to supply the air that shapes or fiberizes the
adhesive exiting the nozzles (pattern air). The module‐actuating air is
controlled through solenoid valves that are installed on the applicator and
connected to a module‐actuating air supply line with an air pressure
regulator. The pattern air is usually controlled through an air pressure
regulator installed in a pattern air supply line.
The adhesive manifold and heated air manifold are heated by cartridge‐type
heaters. Power is supplied to the heaters through a cordset, which is
connected electrically to the hose or to some combination of splitter and
extension cables. Resistance temperature detectors (RTDs) or
thermocouples sense the temperature of the adhesive or air in the manifolds
and relay the temperature through the cordsets, hoses, and/or cables to a
melter control system or to a standalone temperature controller.
The pattern in which adhesive is dispensed onto the product is determined
by:
S the number and spacing of the modules
S the choice of nozzle
S the distance at which the nozzle is placed above the product
S the production line speed
S the adhesive add‐on weight (melter pump speed)
S the pattern air pressure
S the pattern air temperature
S the adhesive application temperature
S the type of adhesive used
S the viscosity of the adhesive used
To Next Page
Loading...
Need help?
General
