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Injection molding process 

Injection molding (Injection Molding): refers to a model with a certain shape, which is formed by injecting the molten colloid into the mold cavity by pressure. The process principle is: the solid plastic is melted according to a certain melting point, and the A certain speed is injected into the mold, and the mold is cooled by a water channel to solidify the plastic to obtain the same product as the designed cavity. Mainly used for the molding of thermoplastics, but also for the molding of thermoset plastics.

Characteristics of injection molding 

Injection molding has a short production cycle and high productivity. Injection molding can produce plastic parts with complex shapes, high size requirements and various inserts, which is difficult to achieve by other plastic molding methods; secondly, injection molding is in the production process It is easy to realize automation, such as injection, demoulding, gate removal and other operations can be automated, so injection molding has been widely used.

Manufacturing processes:


Every project starts with an idea.  Whether you have a CAD file ready, or need assistance taking your idea and turning it into a design, ZTL Technologies is ready to assist!  Plastic injection molded parts might be part of a small inner-working, or the focal point of your entire product.  In every case, you have our full attention.  Our team can aid in design, help with material selection, or help in any way you require – we are here to serve you!  Once your design is ready for production, your mold is created.

Mold Creation

Your mold is not your finished product.  It is the mold with which we will rapidly produce thousands of identical copies of your finished product.  Your mold is created in our own CNC department, reducing time and costs.  The mold is a hollowed-out cavity, built to specification, using our CNC and EDM machines.  


To create plastic parts, molds are filled with plastic pellets, then superheated and injected to form a solid mass within.  Once it cools, the plastic part encased in the mold is built precisely to your design specification. 

Your design may require a process called Overmolding, the layering of multiple polymers into one mold for added color, texture, and strength.

One mold can produce thousands of identical units.

Finishing and Shipping

We offer a full range of finishing options to add protective and decorative layers to your plastic parts.  After completion, parts are professionally packaged and shipped.  All shipments are tracked ensuring you receive your shipment in a safe and timely manner.

2.1 Advantages: The molding cycle is short, the production efficiency is high, and it is easy to realize automation. It can form complex shapes, accurate dimensions, plastic parts with metal or non-metal inserts, stable product quality, and wide application range

2.2 Disadvantages: The price of injection molding equipment is relatively high; the structure of injection mold is complicated; the production cost is high, the production cycle is long, and it is not suitable for the production of single and small batches of plastic parts.


Except for a few thermoplastics (fluoroplastics), almost all thermoplastics can be produced by injection molding. Injection molding is not only used for the molding of thermoplastics, but also has been successfully used for the molding of thermosets. To At present, its molded products account for 20-30% of all current plastic products. In order to further expand the scope of injection molded plastic parts, some special injection technologies have been developed specifically for molding plastic parts with special properties or special structural requirements. Such as precision injection of high-precision plastic parts, multi-color injection of composite color plastic parts, sandwich injection of sandwich plastic parts composed of different materials inside and outside, and injection compression molding of optically transparent plastic parts.