Théomeca is recognized in the design and manufacture of injection molds for the plastics industry covering a wide range of applications and fields of activity.

With 30 years of experience in the field, Théomeca is able to take on projects in their entirety without resorting to subcontracting or other providers; our process control is complete.

Théoméca focuses on the following specialties: prototype, series, polyurethane (RIM), and blow molding.

From feasibility studies to customer trials, Théoméca relies on multiple technologies to provide turnkey solutions.

Injection molding allows for the production of parts in small to large batches from plastics, elastomers, or other raw materials with relatively low melting points (thermoformable). The technique involves heating the material before injecting it into the mold and applying sufficient pressure to fill all the mold cavities. The number of mold cavities or impressions, combined with the cycle time (heating, injection, and cooling), determines the process’s productivity.

The molds consist of two half-shells that fit onto the injection molding machine (one static, one dynamic). These are frequently equipped with ejectors (or ejection bars) to facilitate the removal of the part held in the mold. 

It is also important to minimize friction during the demolding phase, especially when surfaces are smooth and shrinkage during cooling is significant. This can be achieved by using machining angles or other draft angles that are part of the mold design itself.

It is also possible that the mold may need to be equipped with inserts that allow for localized increase in the strength of the molded part.

The design of a mold must be given the utmost attention; not only must the part be easily removed from the mold, and the machining result be perfect, but it must also be ensured that it is completely filled during the injection phase.