APPLICATION NOTE
SOLID STATE RELAYS IN INJECTION
MOLDING MACHINES
Background
Injection molding is a very common process
used for producing plastic, glass or metal parts.
This process consists of passing the desired
material through a heating and mixing process
and injecting it into a mold. Injection molding
is used for producing a great variety of plastic
parts such as bottles, cases, automotive parts,
etc.
A plastic injection molding machine usually
has 2 main sections, the Injection unit and the
Clamping unit, and the driving system of the
machine can be either hydraulic, electrical, or a
combination of both (hybrid).
Solution
Solid State Relays are ideal for use in plastic
injection molding machines. They are preferred
over their electromechanical counterparts
because of their extended lifetime, resistance to
shock and vibration, and fast switching.
Due to these superior features, SSRs can be
used to:
• Switch the barrel and mold heaters, allowing
for precise temperature control, thanks to the
SSRs ability to switch fast and often. A single
SSR can drive several heater zones. The SSR’s
high I²t allows to use low cost circuit breakers to
protect the relay.
• Adjust the position of the tool and get the mold
accurately clamped. A solid state reversing
contactor provides the required accuracy in
addition to a higher life expectancy than an
electromechanical contactor.
• Actuate the pins that eject the molded part.
A compact DIN Rail mount SSR saves cabinet
space and provides extended reliability.
SSRs are preferred over
their electromechanical
counterparts because of their
extended lifetime, resistance
to shock and vibration, and
fast switching.
Heating Control
Motorized Clamping Tool
Page 1
RELATED PRODUCTS
Reference on
Diagram
Product
Features
• 60 Amp rated solid state relay
• High I²t
• Cage clamp terminals accept up to 3
AWG wire size
• Built-in overvoltage protection
• 7.6 Amp solid state reversing contactor
• Built-in overvoltage protection
• Ultra-efficient thermal design
• Ready-to-use solid state relay
• Compact size (11 or 18mm)
• HP rated
Function
Brand
1
NOVA22
DR45 Series
Barrel & Mold
Heaters
Crydom
2
SOLICON
DRC Series
Clamping Unit
Crydom
3
SeriesOne DR
Ejection System
Crydom
INJECTION MOLDING MACHINE DIAGRAM
Page 2
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