Rubber injection molding in Bulgaria

Mario 10 has been injection molding rubber in Bulgaria for more than 30 years. Injection molding shapes a rubber compound using heat and pressure, injecting it into a mold to form the component. Key benefits include fast production, less waste, and tight tolerances—making it one of the most common methods for high-volume rubber manufacturing.

Injection tooling is typically more expensive than compression or transfer molding, but this is often offset by lower part costs due to faster production.

We operate horizontal and vertical injection presses with capacities from 450 to 2000 cm³ and clamping forces from 140 to 300 tonnes, and we continuously upgrade our equipment to stay at the forefront of injection molding technology.

Industrial rubber injection molding

• Extensive capacity

• Product weight from 10 g to 2500 g

• 30+ years of experience

Injection molding process

Injection molding starts with careful material selection and preparation. The rubber compound is produced as a continuous strip (approx. 40–50 mm wide and 8–10 mm thick) and is continuously fed into the press screw. The rubber travels along the screw and fills the barrel to a predefined shot weight. A ram then forces the material through an injection nozzle into the runner system, filling the mold cavity/cavities. After curing, the mold opens, the part is removed, and the runner is trimmed. The machine then repeats the cycle. 

Injection molding

• Fast process

• Multi-cavity molds

• Automated systems

• Development of application-specific compounds

• High-volume mass production of parts

• High initial investment

Advantages

• Eliminates the need for pre-formed rubber blanks

• Minimal loading time and reduced material waste

• Shorter curing and cycle times

• High-volume production of high-precision components

• Can produce over-molded components 

Disadvantages

• Tooling can be complex and expensive

• Longer setup times

• Requires specialised machinery

• Less economical for low-volume parts