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Not many years ago, molds featuring hot
runners were the exception. Moldmakers
used to design and manufacture their own systems or purchased hot runner
components and assembled them into the mold. Today, hot runner is the rule
and most mold manufacturers purchase a hot half to suit their molds. With
over two dozen suppliers selling and/or manufacturing hot halves and hot
runner components, one needs to understand the fundamental engineering
principles of a hot runner system in order to make the right choice to
suit his particular application.
Therefore, this two day, total 16
hours, seminar is
designed to remove some of the "gray areas" in understanding hot
runner systems. Emphasis is placed on understanding the design, assembly
and operation of a hot runner system. This seminar is extremely valuable
to those who have to perform maintenance, unless one does not mind
about leakage, cavity blockage, gate stringing, material burning, or gate
freezing. Comprehending the proper care
and maintenance procedures will even shed some daylight on the night shift
of your molding operation. The seminar is designed to be comprehended by
all levels of personnel involved in mold fabrication and procurement.
Understanding of the injection molding process and knowledge of the
injection mold is a prerequisite.
At this seminar you
will....
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Understand the polymer flow
and behavior in hot runner systems.
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Learn how to convert
all
pellets into profits.
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Comprehend the
sophistication of a hot half.
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Understand the pros and cons
of runnerless systems available on the
market.
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Comprehend the advantage of
one type of system versus another.
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Receive a source of
technical information, allowing one to communicate effectively with
the mold builder and the system supplier.
-
Receive a comprehensive
custom-developed instruction manual, provided only to participants of
this seminar, which will serve as a valuable source in the future.
Seminar Outline
I
Polymer flow through a hot runner system
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Why and when to use a hot
runner: advantages and disadvantages.
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Understanding
molding machine specifications and the cycle elements.
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Polymer structure
and processing properties.
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Understanding
polymer flow and behavior, orientation and gate location(s). Gating
types.
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Experimental
studies of mold filling; Polymer flow around sharp edges; Annular and
cylindrical flow; Internal versus External heated systems.
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The effect of
part-cooling rate.
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Factors
contributing to manifold balance.
-
Plastic material
molding conditions.
-
Selecting the
proper filter nozzle.
II
Hot Runner Types
-
Introduction and
history: Insulated sprue and runner, torpedo-heated runners. Heated
manifold tubes and blocks. External heated manifolds. Hot halves.
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Mechanics: Thermal
expansion, force distribution and dynamic forces during the molding
cycle. Manifold pocket and
pillar support. Recommended surface
finish, screw torque and surface roughness settling.
III
Heating and cooling requirements
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Estimating and/or
calculating heat losses.
-
Types of heat
transfer.
-
Insulating
materials used.
-
Thermal
conductivity of materials used in the hot runner industry.
-
Gate cooling,
cooling analysis, cooling line requirements and gate cooling inserts.
IV
Heating elements and thermocouples used in the Hot Runner Industry
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Type of elements:
cartridge, coil or cable, tubular, etc.
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Heating element
layout.
-
Power requirements
(Wattage change with Voltage change)
-
Electrical data for
manifold wiring.
-
Seebeck Effect.
-
Thermocouples and
color-codes.
-
Power and
thermocouple wiring, cable connectors.
V
Internally heated Hot Runner Molds
VI Hot Runner Systems and Hot Halves
VII Valve gate systems
VIII Polymer
cleaning technology
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