The dual-compound machine or multiinjection press

Equipping an injection molding machine with a second injection unit has become customary to REP on all types of machines in all configurations: injection from the top or the bottom, the back or the side.


The user's objective is to produce parts integrating several compounds of various characteristics. The goal consists in combining technical performances at optimized costs:

  • elimination of assembly operations
  • integration of a low-cost compound into a part, thus limiting the quantity of noble compound to the functional part only

The dual-compound injection principle can be adapted to all injection presses, regardless of the size of the closing units and of the injection units.


The production of dual-compound parts may be performed using:

    • Two sequential injections into two complementary cavities,
    • Simultaneous injection into two different cavities or in two separate part cavities,
    • Simultaneous (or offset) injection into one single cavity.


It is either possible to directly inject into the mold or through a special cold runner block (CRB) integrating several compound circuits.


Let's have a look at the dual-compound CMS: That's productivity, versatility and flexibility!

The dual-compound multistation machine (CMS in G9 and CMX in G10)  is an injection press with 4 rotating stations and 2 injection units.

It allows for the synchronous curing, stripping, and injection of 2 compounds in the same mold.


Much higher hourly production: gain in productivity of 50 to 100% compared to a single-station press of 400 tons.

Quick mould change (10 minutes for 4 moulds).


Possibility to disable a mold.

Ability to program different shot sizes.


Adaptation of the stripping station to various kinematics.

The dual-compound multistation press is not only dedicated to dual-compound injection: users can switch from simultaneous injection to sequential injection, or only use an injection unit if required !