Moldie is a leading provider of molds and dies for various industries. In order to further expand its services, Moldie has invested in state-of-the-art technology by purchasing one set of 1900T 2K injection machines. This new addition will allow Moldie to offer 2K injection molding services to its customers, allowing for the production of multi-functional and complex parts.
A 2K mold (two-component mold) injects two materials or two colors into one part in a single cycle. Moldie builds 2K molds in-house as part of our injection mold manufacturing services.
Moldie’s 2K injection molding service is an ideal solution for customers looking to create complex, multi-functional parts with a high level of precision and consistency. With the use of advanced equipment, experienced technicians and quality control, Moldie is committed to providing a reliable and efficient service to its customers.
What is 2k Injection Molding?
This innovative manufacturing process can efficiently produce a complicated molded part from two different materials or colors. It is called 2k injection molding because the materials may be of different properties or hardness levels but are processed into one product in one injection molding process.
Types of 2K Molds
- Rotary (turntable) 2K mold: the moving half rotates 180° so the first-shot part moves into the second cavity. Most common for high volumes; needs a 2K press with a rotary platen or a mold-mounted index plate.
- Core-back (core-pull) 2K mold: a core retracts after the first shot to open space for the second material, without moving the part. Simpler tooling, but limited to parts where the second material sits next to or on top of the first.
- Transfer 2K mold: a robot moves the first-shot part into a second cavity. Flexible, at the cost of a longer cycle.
Which type fits depends on part geometry, the two materials and volume.
Applications used for 2k injection molding
2k injection molding can effectively handle the combination of hard and soft plastics or two colors in one play plastic product. One instance where 2k injection molding can be used is in a plastic product is with the plastic and the lid seal made of soft plastic. Usually, the 2k molding process is in two steps.
Some products manufactured with the 2k injection molding process include toothbrushes, a soft and hard handle piece, control buttons, anti-slip applications, bicycle handlebar grips. The manufacturing process used in 2k injection molding involves making two sets of cavities. During the production process, plastic is injected into one cavity of the mold. The mold is made to rotate, and the plastic is injected into another cavity once the previous mold is hard.
Benefits of 2k Injection Molding
The primary reason the 2 component injection molding process is common and widely accepted is that it saves costs. The 2k injection molding process saves the time that would have been used in the possible assembly step. It is not only economical, but it also produces the best design features and aesthetics.
Supports detailed features
During the injection molding process, plastics are subjected to intense high pressure and, as a result, are pressed harder against the molds. The result of this is that a large amount of details can be included in the design. Also, with high pressure peculiar to the injection molding process, complex shapes can be manufactured at a reduced rate.
More so, since plastic can be injected into the mold using one or more injections, the 2k injection molding allows a more defined split between the two materials. For instance, the hardness or softness of a material or using different colors.
Flexibility
The 2k injection molding is all about flexibility. This allows for production with different colors or the latest technology. It also gives you the liberty to choose different designs compared to metal production.
High efficiency
Unlike other molding processes, the 2k injection molding is quick once the injection molds have been designed to the customer’s specification and preset. It allows more parts to be produced from a single mold. This high production rate makes it more cost-effective.
The production costs can be significantly lower since 2k technology assembles steps together into one injection molding process.
Fewer Parts and No Assembly
Because both materials are molded and bonded in the same cycle, one 2K part can replace two separate parts and the step of assembling them. That removes assembly labor and the defects that can come with it.
Appearance
Products made with 2k injection molding are more attractive since two colors can be used in one part.
Saves manufacturing costs
This automated process is performed by machines and robotics. The sole operator’s role is to control and manage. Automation reduces manufacturing and overhead costs. It also reduces the waste associated with assembly defects.
With a reduced workforce during this injection molding process, the entire manufacturing cost is significantly reduced. Another advantage of the automation process is accurate injection molds. Computer-aided design (CAD) and computer-aided manufacturing (CAM) are used and ensure precision in making the molds.
Customizable
Functionality and durability are essential aspects of any product. The combination of hard and soft plastic makes the product more user-friendly since the soft plastic cover or soft edges increase the user’s comfort. Products can also be tailor-made to fit the buyer’s needs.
Environmentally friendly
Since there is little wastage, the 2k injection molding process is environmentally friendly. Manufacturers adopt sustainable practices such as plastic regrind to minimize waste.
2K Molding vs Overmolding
2K molding makes both shots in one press and one mold, with automatic transfer; overmolding usually molds the substrate separately and loads it into a second mold. 2K tooling costs more but suits high volumes and tight bond lines; overmolding suits lower volumes. Full comparison table: two-shot molding vs overmolding vs insert molding.
Finally, with 2k injection molding, you have more creative powers. However, there are still fundamentals to adhere to, such as using the right materials and combining the right plastics to get better results.
2K Mold Examples
- Two-shot screwdriver handle mold: screwdriver handle with soft grip.
- Two-color toothbrush handle mold: toothbrush handle, multi-cavity.
- Two-color measuring cup mold: measuring cup with grip.
What We Need to Quote a 2K Mold
- 3D files (STEP/IGS) of the finished part and of the substrate
- Both materials and colors
- Annual volume and cavity count
- Bond requirement (chemical / mechanical interlock)
- Your press model, if you will mold in-house
We are happy to answer your questions about 2k injection molding and take your order. We offer a free quote and guarantee customers the use of high-quality and durable materials that exceed expectations. Send us your part for a 2K mold quote.
