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AFM Plast Srl

Via Lazio 6,
60030 Monsano

+39 0731 1987050

Injection molding

Expertise and technology, working together

Injection molding is one of the most widely used manufacturing techniques in the plastics industry due to its efficiency, ability to produce large volumes, and capacity to create complex shapes. When brought to its melting temperature, any thermoplastic material (Polypropylene, Polycarbonate, Polyamide 6 – also known as Nylon, ABS) becomes a viscoelastic liquid without losing its inherent properties.

For processing, the material is melted in pellet form at temperatures above 200°C. Unlike rubbers or thermosetting polymers, which undergo irreversible structural changes when heated, thermoplastics can be melted repeatedly. Once melted, the material is injected into the mold cavities, where it cools and solidifies in the pre-engineered shape.

Braccio robotico all’interno di una pressa per stampaggio a iniezione mentre impila componenti plastici industriali neri

From raw material
to finished product

Preparation

The process begins with plastic dehumidification, followed by feeding the material in pellet form into a hopper. The pellets consist of thermoplastic resins such as polypropylene or ABS.

Melting

The pellets are then conveyed via a screw (commonly called the plasticizing screw) into a heated cylinder. The rotating screw compresses and heats the pellets until they become molten.

Injection

The molten material is injected at high pressure into a mold, carefully engineered to give the final product its intended shape. The mold consists of two halves, one fixed and one movable, which close to form a cavity.

Cooling

The injected molten material cools inside the mold, solidifying and taking on the shape of the cavity.

Ejection

Once solidified, the mold opens and the part is ejected, usually through pneumatic mechanisms that push the piece out of the mold cavity.

Finishing

The injection-molded part may require finishing operations, such as the removal of excess material around edges, including flash or runners.