Blow is the relation to plastic overmolding and 2k injection molding.

There are very similar between plastic overmolding and 2k injection molding (2 shot injection molding) but they have some key differences. see below for the different between those two molding process.To get more news about 2k injection moulding, you can visit asm-mold.com official website.

Plastic over molding is using normal single nozzle injection molding machine to produce the two different type of plastic parts in one (or two different color of plastic parts in one solid part), over molding process means move the first part (substrate part) or melt inserts (insert molding) to the subsequent mold (over mold) and mold to get the final part. Overmold can be used to add a soft-touch grip to a tool handle, or to create a product with multiple colors or textures.

2K injection molding, also known as two-component injection molding, 2 shot injection molding or dual-injection molding, It is using the 2K injection molding machine injecting two or three materials (colors) simultaneously into the same mold. Unlike overmolding, both materials are injected at the same time, and they will be fully bonded together once the molding process is completed. 2k molding process is complex but fast, efficient, and high quality.

Compare to plastic overmoulding and 2k injection molding, 2k injection molding has high quality and high production efficiency, but since the 2k injection molding machine is too expensive, so sometimes use over-molding to replace it, on the other hand, overmoulding cost is high than 2K injection molding cost, but plastic over molding can use any normal injection molding machine to produce the over moulded parts, so for low volume of 2 color molding.

Plastic over molding has more advantages, and some of parts can only be done by plastic over molding process, but for the high volume of 2 color molded parts using 2K molding process will be the best. Both overmoulding and 2K injection molding have their own advantages and disadvantages, depending on the requirement of the final product.

Both over molding and 2K injection molding can be used to create products with multiple materials or layers, but the key difference is that in overmoulding, two materials are molded separately, and then combined together, while in 2K injection molding, two materials are molded together in the same process.
Plastic Overmolding is an operation in which two or more mediums (substances) are merged to form an ending molded product, plastic over-molding needs to make two separate molds, one is substrate (first mold), the second mold is called over mold (usually a TPE material for the second mold), but if the substrate is metal parts or brass parts, this type of over molding we normally call insert molding, and insert molding only need one mold to finish the process.

The plastic over molding materials majorly used are thermoplastics (TPE) and rubber, or the same material but different colors. During over molding, the activity that happens is either mechanical or chemical which leaves the two substances bonded.
Plastic Overmolding process is producing the molded part (substrate) from the first mold and move it to another related over mold, the substance can be used to combine the surface molded with the molding substrate. The molded material can otherwise be put back to the surface it was extracted from and the overmolding substance added. Types of over molding include two shot sequential over molding, insert over molding or multi-shot injection molding.

Two shot sequential plastic overmolding is where the molding machine injects the first plastic resin into a first mold cavity (both molds in one molding machine), once formed then move the molded part to the second over mold immediately and close the mold and injecting second material, using the first component as an insert for the second shot using a different material or color, requires special injection machine which has the two injection units.

Insert over-molding uses a pre-molded insert placed into the mold before injecting the second material, if it the inserts are metal or brass, then we call metal insert molding, this overmolding process which we used a lot, Multi-shot injection molding injects multiple plastic resin into the mold cavity during the same injection molding cycle.