Dual-compound injection machine with 4 rotating stations and 2 injection units

A multistation bi-material injection molding press

The dual-compound CMS machine is an injection press with 4 rotating stations and 2 injection units allowing for the synchronous curing, stripping, and injection of 2 compounds in the same mold: that’s productivity, versatility and flexibility!

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 and integration of a low-cost compound into a part, thus limiting the quantity of noble compound to the functional part only.

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’s 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. 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.

Increased Productivity and Flexibility

By equipping the CMS for the first time with a second injection unit REP grants their customers optimized productivity and maximum flexibility. First of all we want to emphasize that a CMS press - thanks to its four molds - allows for a much higher hourly production, which means a gain in productivity of 50 to 100%, than a single-station press of 400 tons.

Regarding flexibility the CMS is characterized by the quick mold change (10 minutes for the 4 molds), the possible deselection of one mold, the programming of different injection volumes and the adaptation of the stripping station to various kinematics. The dual-compound CMS 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 !

An exclusive know-how

The CMS allows for enhanced productivity by limiting the number of cavities per mold, thus leading to a better control of the flow inside the cavity. As a multi-station and multi-injection machine, the dual-compound CMS concentrates REP’s exclusive know-how.