Ruey Chyi

Injection Mold & Molding Manufacturer

Injection Molding

One of the most common plastic manufacturing methods, injection molding lends itself to mass production of products ranging from cell phone stands to toys. The injection molding process melts resin pellets inside the injection machine with a heated barrel. An auger moves the plastic forward and ensures an even mix of melted plastic. The machine then drives the melted plastic into a metal mold. The plastic fills the mold and results in a solid plastic part or product. Most injection molding processes employ thermoplastics that you can melt and cool multiple times, which limits material waste.

Extrusion Molding

Extrusion molding calls for a very similar process as injection molding. The machine still melts the plastic. Rather than filling a mold with the plastic, the machine presses the melted plastic through a die that gives the plastic a fixed shape. The extrusion molding process functions well in the production of a wide range of products, including pipes, door frames and seals. The extrusion process can employ either multiple-melt thermoplastics or thermoset plastics, which only tolerate a single melting cycle.

Blow Molding

Several variations of the blow molding process exist. The essential process calls for the production of a hollow, pre-shaped length of melted thermoplastic, known as a parison. A mold closes around the parison. Air pressure forces the hollow plastic to expand into the mold shape, leaving the interior of the object hollow. Variations on the blow molding process include injection and extrusion blow molding as well as stretch blow molding. Manufacturers employ blow molding processes to make bottles and other containers.

Rotational Molding

Rotational molding offers a second option for manufacturing hollow objects. In rotational molding, the plastic powder goes in the mold before heating. The closed mold enters a furnace and rotates, which allows the plastic powder to coat the entire interior of the mold. The heat melts the plastic into a single layer that conforms to the shape of the mold cavity, while leaving the interior of the final product hollow. Manufacturers use rotational molding to create products and components for a wide range of uses, including auto parts, toys and furniture.
%d bloggers like this: