Plastic injection molding

Plastic injection molding is the cornerstone of GMN Plastics’ plastic manufacturing capabilities. Molded plastic parts offer versatile design options and durability in harsh environmental conditions. From concept generation through production, our team of dedicated experts can help guide you through the manufacturing process to create high-quality components. Under one roof, we can combine our complementary capabilities like spray painting and laser etching or value-added possibilities such as membrane switches to build complete user interfaces.

Conventional plastic injection molding

With machine tonnage from 40 to 600 tons, GMN Plastics’ state-of-the-art injection molding equipment allows us to consistently produce exceptional parts and continue to serve our customers at the highest level.

Plastic is an ideal material for many industries, especially those that are highly-regulated, which is why our organization is well-versed in medical, aerospace, automotive, and industrial regulations and requirements. No matter the industry or application, the GMN Plastics team knows what our customers need and how to make their programs successful.

Injection molding advantages:

  • Flexible design options (curves, textures, etc.)
  • Superior resistance to outdoor elements
  • Well-defined edges and shapes
  • Tight tolerances
  • Wide variety of decorating options
  • Long tool life that exceeds millions of parts

In-mold decoration

Plastic In-Mold Decoration

The in-mold decorating (IMD) process involves imbedding a graphic overlay into an injection molded plastic piece, which protects the graphics and inks from wear over time. IMD offers unmatched durability, amazing design flexibility, and allows for the decoration of complex three-dimensional parts.

Advantages of IMD:

  • Decoration and registration of compound curved surfaces and 3D shapes
  • Improved aesthetic appeal
  • High durability and resistance to chemicals and abrasion
  • Simplified production process
  • Ideal for designs with small windows or backlighting
  • Perfect for high-wear applications and ruggedized industries
  • Multiple aesthetic effects (e.g. wood grain, carbon fiber, and high-gloss piano black)


Overmolding combines materials with different properties into a single molded component. Most often, this involves bonding together a rigid plastic or metal and a softer or rubberized plastic. This value-added process supplies both functional and aesthetic benefits. While most frequently utilized for its durability, overmolding is also used to add a softer, more ergonomic texture to components or smoothen sharp edges. Typically seen in the electronics, industrial, and medical industries, overmolding is perfect for products with multi-colored buttons, switches, or knobs, soft-touch handles and grips, and more.

Plastic Overmolding

Additional overmolding advantages:

  • Reduction of unwanted vibrations or noise
  • Protection against liquids
  • Additional brand identity opportunities
  • Sealing and gasketing

Overmolding processes at GMN:

  • Two-shot molding
  • Conventional overmolding
  • Insert molding

Vertical injection molding

In addition to our conventional injection molding equipment, GMN Plastics is also equipped with a 77-ton vertical injection molding machine that is commonly employed for overmolding applications. With a rotating platen on the “B-half” of the tool that spins around 180, this machine can utilize two “B-half’s”, allowing for more parts to be created more efficiently. Vertical molding takes advantage of gravity to keep parts secure in the necessary tool locations.