One of the largest benefits CTG, Inc. can provide to its customers is a broad range of manufacturing capabilities. With other manufacturers, customers need to source parts individually. Where others fall short, CTG, Inc. steps up. Our ability to manufacture, source, package, and ship parts on time even in an emergency makes CTG, Inc. Your one stop injection molding shop.
How plastic injection molding works
Injection molding produces parts by forcing molten plastic into a mold where it cools and hardens. Granular plastic is fed by gravity from a hopper into a heated barrel. As the granules are moved forward by a screw-type plunger, the plastic is forced into a heating chamber, where it is melted. As the plunger advances further, the melted plastic is forced through a nozzle into the mold cavity. The mold remains relatively cold so the plastic solidifies almost as soon as the mold is filled. Custom steel tooling is required and adds to the initial cost but is quickly amortized.
Injection molding provides low cost at moderate to large quantities. This method of making plastic parts is an extremely versatile process for producing a wide range of parts with an excellent finish. Almost any 2D or 3D shape can be achieved. However draft is required in most cases as the shape must allow ejection from the mold. Side holes and even threaded holes are possible though they complicate the tooling.