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What conditions need to use hot runners in two-color mold manufacturing?
May 11, 2018

1. What is a two-color mold?


 Two-color mold refers to two kinds of plastic materials injection molding in the same injection molding machine, divided into two molding, but the product is only a mold die. In general, this molding process is also referred to as two-shot molding and is usually completed by a set of molds and requires a special two-color injection molding machine.


Two-color molds are increasingly popular on the market. This process can make the appearance of the product more beautiful, easy to change color and can not spray, but the design and injection molding requirements are high.


2. What conditions need to be used in the manufacture of two-color molds?


In the manufacture of two-color molds, hot runners are sometimes used. The hot runner molds are molds that use a heating device to keep the melt in the runner from solidifying. Because it is shorter than the traditional mold forming cycle and saves more raw materials, the hot runner mold has been widely used in various industrialized countries and regions in the world today.


The following situations require the use of a hot runner system:


a.Quality strict injection products.


b.A variety of plastics, a variety of colors co-injection process.


c.The gate direction is at a certain or perpendicular angle to the mold opening direction.


d.Multi-layer mold One way to increase production without increasing the tonnage of the injection molding machine is to use a multi-layer mold. That is, there are multiple mold sections on the mold. This mold is completely realized by the hot runner system.


e.Gates open on the inside of deep parts. Some industrial products require very strict appearance. The use of ten should not expose any traces of the gate. Smaller parts such as cosmetic lipstick covers and automobile interior parts. At this point, you need to place the gate inside the part. When the depth of the part is too large, it is not possible to use a cold runner gate, but only use a hot runner nozzle to inject into the interior of the part.


Use hot runner controller for hot runner systems.

300S 6 zones hot runner control.jpg

3, mold use hot runner benefits?


a) Shortening the molding cycle of parts, many thin-wall parts produced with hot runner molds can be molded in less than 5 seconds.

b) Save plastic raw materials, no production waste in the pure hot runner mold. It is an effective way to reduce material costs and material costs.

c) Reduce fees and improve product quality.

d) Eliminating follow-up procedures is conducive to production automation.

e) Expand the application of injection molding process.

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