Sometimes known as double Injection, 2 material, 2 shot molding or 2K molding, is an innovative manufacturing process used to produce complicated molded parts from two different materials. Through a highly specialized and automated process we carefully control the injection of multiple materials, including two different kinds of resin, into a single, multi-chambered mold.
What is 2k shot plastic injection molding
2k shot Injection in performed on one machine that is programmed to perform two injections in one cycle. In the first cycle, a nozzle injects plastic into a mold. The mold is then automatically rotated and a different type of plastic is injected into the mold from a second nozzle. and are molded in two times, but the product only molds once. this is called 2k injection molding, this process need special 2k plastic injection machine. current, it is not secret technical, on the market, there also have many branded 2color injection machine manufacturer, such as HaiTian, LiKin, also Arburg and so on.
Double Injection Molding optimizes co-polymerization of hard and soft materials to create powerful molecular bond. The result is a single part with production and feature advantages. It can be used for a variety of product designs across all industries. It also allows for molding using clear plastics, colored graphics and stylish finishes which improves your product functionality and marketplace value.
2k molding Vs overmolding
The benefits of 2k injection moulding
The disadvantages of 2K molding
2k injection molding plastic material
2k shot molding plastic material bonding
2K shot molding design guide
- the accuracy of the moldbase is high, generally using Futuba moldbase.
- The guide pin and bush of the moldbase must be symmetrical about the top, bottom, left and right, and the mold cavity and core side must be symmetrical.
- The mold core side should be rotated 180 degrees, and the mold cavity side does not move.
- The spacing of the products must be based on the spacing of the nozzles of the injection molding machine. The spacing of the nozzles of the 2k injection molding machines abroad is adjustable, and some are not adjustable, and the domestic ones are not adjustable.
- Two independent ejector systems, the ejector bar is also two. The two products of the cavity side are the same, the ejector pin are the same, and the rotation relationship is not made into a parallel relationship.
- The ejector plate can only be reset by spring. It is not possible to force the reset by the screw because the mold core side should be rotated.
- The side lock must be on the four sides of the center of the mold, and the cavity and core of molds are symmetrical. Otherwise, when the core side of mold is rotated 180, it will not be aligned with the cavity side of mold.
- Pay attention to the direction of the parallel nozzle of the injection molding machine provided by the customer, which is the X-axis or the Y-axis, so as to determine the layout of the product ranking.
- The direction of cooling water inlet and out must be on the side of the top and bottom side, and the inlet and out of each circulating water must be on the same side. The cooling water should not be inlet in the topside, and and outlet on bottom side. Because the mold core side should be rotated 180 degrees, pay attention to the size of the mold. Do not exceed the height of the water tank of the injection molding machine, otherwise the cooling water cannot be transported.
- The first injection of the product should be placed on the non-operating side, because the first injection of the product should be rotated 180 degrees for the second injection, just to the operating side, easy to take the product out.
- The Clamping slot for the export mold should be on the operating side and the non-operating side, not on the top and bottom side, because their products should be fully automatic running.
2K shot injection molding Youtube Video
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