Double(2K) injection

Skill:Double(2K) injection

Advantage:——Less labor,short cycle time

                   ——Build the part with two different materials,or two different colors

Double(2K) injection molding refers to the injection of two different materials into the same set of mold, so as to achieve the injection out of the parts formed by two materials molding process. Some of the two materials are different colors, some are different material with two hardness, so as to improve the cosmetic of the product and assembly performance.

Key Points of Design:

1.  Molding Section

The molding section of the double(2K) injection mold is basically the same as the general injection mold, but the difference is that the two cores should be the same,which are well fitted with the cavities.Generally this kind of molding plastic parts are small.

2. Mold Release Mechanism

Since the double(2K) injection plastic parts can be demolded only after the secondary injection, the demolding mechanism on the primary injection device will not work. For a horizontally rotating injection molding machine, demolding could use the ejection mechanism of the injection molding machine. For a vertically rotating injection molding machine, the ejection and ejection mechanism of the injection molding machine cannot be used, and a hydraulic ejector can be set on the rotary table for mold release.

3.Gating System

Since it is double(2K) injection molding, the gating system is divided into first gating system and second gating system , which come from two injection devices respectively.

4.Mold

Due to the special molding method of double(2K) injection molding, it needs to cooperate and coordinate with each other, so the size and precision of the two pairs of mold guide devices should be consistent. For a horizontally rotating injection molding machine, the closed heights of the molds should be the same, and the centers of the two pairs of molds should be on the same turning radius, with a difference of 180 degree ; And for the injection molding machine with vertical rotation, the two molds should be on the same axis.