2k Injection Molding

2K is well known as 2 shot injection molding or two colour injection moulding, consists of two different plastics or two different colors of one plastics into an end product by means of one injection molding process.

Premium is an industrial machining inc that has manufactured parts using the 2K injection moulding process for more than 20 years. The 2k injection molding process enables several functions to be integrated into an injection molded part. Due to the chemical bond between the different materials, excellent adhesion is achieved, without the thermoplastic part requiring chemical pre-treatment. two colour/ 2K injection moulding component technology is also ideal for parts with large batches.

How Does 2K Injection Molding Work?
How Does 2K Injection Molding Work?

2K injection moulding, sometimes know as double injection, two color injection molding, or 2 shot molding, is an innovative manufacturing process used to produce complicated molded parts from two different materials into the multi-chambered mold.

2K injection moulding perform in one machine which is programmed to perform two injections in one cycle. In the first cycle, a nozzle injects plastic into a mold. The 2k plastic injection moulding is then rotated automatically and another type of plastic is injected from a second nozzle into the mold.

Two Color Injection Molding Technology Processes

Two Color Injection Molding Technology Processes

Two Color Injection Molding Technology Types

The two color injection molding technology has three types according to the structure classification. They are core rotation, core retreat, push plate rotation.

The cycle time of overmolding injection molding process is a bit longer, our experienced molders will monitor the cosmetic concerns, fill pressure and basic quality of the parts. After the substrate parts are molded, the overmold will be assembled to the press and the substrate parts will be put by hand into the mold and overmolded with rubber material or thermoplastic.

Two Color Injection Molding Technology Features
  • The two color injection molding technology needs to match the injection molding machine. 2k mould has more than a rotating mechanism or up and down sliding mechanism. The precision of the two colour injection moulding technology is high.

  • There is a difference in the 2k injection moulding former model, and then the core is consistent. Two color injection molding technology should pay attention to the application of cylinder or other power.

Two Color Injection Molding Technology Design Features
  • The two shapes of the mother mold are different, forming one product respectively. While the two shapes of the male mold are exactly the same.

  • The front and back of the two color injection molding products must match after rotating 180°to the center.

Advantages Of 2K Injection Molding

Advantages Of 2K Injection Molding

  • No secondary processing and assembly steps

  • Excellent adhesion to the plastic part

  • Low handling

  • Quick cycle times

  • High degree of automation

  • Stable production processes

  • Economical cost

As one of the professional injection mold components suppliers, Premium has advanced machines that take 2K injection molding/two colour injection moulding.


The 2k injection moulding allows us to integrate multiple properties into one product: for instance, layered products, combinations of hard and soft plastic for making different color combinations.


Two color injection molding optimizes co-polymerization of hard and soft materials to create a perfect bond with production and feature advantages for a single part. Almost all industries can use two colour injection moulding for a variety of product designs. The 2k injection also allows for moulding using clear plastics, colored graphics, and stylish finishes which improves customer's product functionality and marketplace value.


The technology 2K injection molding makes it possible to produce a complete product so that this part does not need further secondary processing and assembly steps. That means gains in the quick cycle time, a constant process, a higher degree of efficiency and the avoidance of manual operation, you can save cost also save considerably on costs with two colour injection moulding.

2K Injection Molding Parameters



Plastic Material

PP, PP+20% GF, PA6, PLA, AS, ABS, PE, PC, PVC, POM, PET, PS, TPE/TPR etc

Mold Material

718H, P20, NAK80, S316H, SKD61, etc. 20~60 HRC

Mold Base

HASCO, DME, LKM, JLS standard

Mold Runner

Cold runner, hot runner

Mold Cold Runner

Point way, side way, follow way, direct gate way, etc.

Mold Hot Treatment

Nitridation, tempering, etc.

Mold Surface

texture, EDM, high gloss polishing

Mold Cooling System

water cooling or Beryllium bronze cooling, etc.

Lead time

25-60 days



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