2k Injection Molding

2K is well known as 2 shot injection molding, 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 who has manufactured parts using the 2K injection process for more than 20 years. 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. 2K injection component technology is also ideal for parts with large batches. 

2k injection machine

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

How Does 2K Injection Molding Work?

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

2K injection 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 mold is then rotate automatically and another type of plastic is injected from a second nozzle into the mold.

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


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

Premium has advanced machines that take 2K injection molding/two Component injection molding.

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

The technology 2K injection molding makes it possible to produce a completely  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 double injection.

2K Injection Molding Parameters

Plastic Material


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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