What Is 2k Injection Molding?

March 1, 2023

2k injection molding, also known as "2shot injection molding" or "double shot injection molding," is a manufacturing technique for combining two different colors or materials into a single piece of plastic. Using a 2k injection molding machine, this plastic molding technique combines two materials or materials of different colors into a single finished plastic part.

The first material that was injected is referred to as the base material, and the second material that was injected is referred to as the overlay material in this article.

Two identical moving molds are used to fit two distinct fixed molds, which is the most common form of a 2k injection mold.

The mold is opened after the first injection of the base material, and the rotatable structure of the injection machine is used to rotate it 180 degrees valve manufacturer in china. After that, the mold is closed, and the second shot is injected using a different color of material or a different material (covering material) than the first one.

The plastic 2k part will be ejected from the moving mold, which has already been injected twice, following the second opening of the mold.

Because both the base material and the cover material are injected simultaneously, the injection machine needs two injection nozzles, each of which injects a different color or base material and cover material.

The toothbrush is the most common everyday application of two-color injection molding.

Hard and soft plastics are combined in a toothbrush. The main part of the toothbrush is made of hard plastic to give it enough strength. To ensure a tactile feel, the part that comes into contact with the hand is made of soft plastic; at the same time, the toothbrush is given a colorful appearance thanks to two-color injection molding.

What Makes Insert/Overmold Molding

Different From 2k Injection Molding? (1) Insert/overmolding is done with a standard injection molding machine. In this method, the product is taken out of one mold and put into another for a second injection molding.

Therefore, there is no need for a 2k injection molding machine because insert and over molding are typically performed using two distinct molds.

A two-color injection molding machine is used for 2k injection molding, which involves simultaneously injecting two plastics.

The product only emerges once after the two plastics are injected into the same machine for injection molding. As a result, a specialized two-color injection molding machine is required for two-color injection molding, which typically requires only one set of molds.

Because the plastic is still molten and there is no cooling shrinkage during the two-color injection molding process, it is possible to form a strong chemical bond between the base material and the overlay material, resulting in high strength and a lower risk of burrs.

Unlike insert/overmold injection molding, which requires inserts to be inserted, 2k injection molding produces higher-quality products with shorter, more effective molding cycles.

Advantages Of 2 Shot Injection Molding

One of the benefits of two-shot injection molding is its ability to incorporate multiple functions into a single plastic part, stroller distributor including soft-sensitive surfaces, ergonomic design, two-color appearance, brand identity, feature enhancement, noise reduction, shock absorption, water resistance, and impact protection, as well as reducing the number of components and saving design space, among other benefits.

Lower engineering costs

A single injection molding procedure can finish a plastic part with multiple uses, reducing the need for additional processing.

Chemical links combine various plastics into a single piece to improve strength and quality.

Carlos Diaz
I believe in making the impossible possible because there’s no fun in giving up. Travel, design, fashion and current trends in the field of industrial construction are topics that I enjoy writing about.

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