2k Injection Molding The Definitive GUIDE (2022)

1.1 The concept of 2k injection moulding

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2k injection molding&#;2shot injection molding or double shot injection molding&#;is a manufacturing process used when referring to molding two materials/colors into one plastic part. This plastic molding technology blends two materials or two different colours materials into one ending plastic part by using 2k injection molding machine.

In this article, the first injected material is referred to as the base material and the second injected material is referred to as the overlay material.

The most common form of a 2k injection mould is two identical moving moulds to fit two different fixed moulds.

After the first injection of the base material, the mould is opened and then rotated by 180° using the rotatable structure of the injection machine, then closed the mold and start second shot inejction by using a different colour of material or a different material (covering material) than the first injection.

After the second opening of the mould, the moving mould, which has already been injected twice, will ejected the plastic 2k part.

The first injection of the base material and the second injection of the cover material are injected out simultaneously, requiring two injection nozzles on the injection machine, each injecting a different colour or a different base material and cover material.

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The distinction between 1K and 2K injection molding may initially seem like a simple choice between one or two components. However, the implications of this decision are multifaceted and can significantly impact the end product.

Complexity

In 1K injection molding, only one type of material or color is used, resulting in a homogeneous and uniform product. This makes the process less complicated, as there's no need to consider interactions between different materials or colors.

2K injection molding, on the other hand, introduces a new level of complexity. Combining two different materials or colors requires precision to ensure they blend correctly without defects or unwanted outcomes.

Possibilities and flexibility

While 1K injection molding may be simpler, this also means it's limited in its capabilities. You are bound by the properties and appearance of a single material or color.

2K injection molding opens a world of possibilities. Combining different materials allows you to create products benefiting from the unique characteristics of each. For example, a toothbrush with a hard plastic core and a soft rubber grip is possible thanks to 2K injection molding.

Cost and production speed vs. design and functionality

1K injection molding is often cheaper and quicker due to the simplicity of the process, making it ideal for products where mass production and budget are the primary considerations.

2K injection molding, however, calls for a more thoughtful approach. Though it may be more expensive and time-consuming, it allows for innovative designs and increased functionality. Products that are not only visually appealing but also functionally superior can result from the flexibility that 2K injection molding offers.

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