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 without spraying, but the requirements for design and injection molding are high.
What is hot runner system
In plastic injection molds, in order to promote the flow of plastic melt in the cavity, the main flow path and the bypass flow path are heated by appropriate methods to keep the plastic in a molten state, and the continuous injection molding structure is a hot runner system.
Advantages and disadvantages of hot runner systems
advantage
Save raw materials, reduce injection cycle, increase production efficiency
100% raw material production, reduce the secondary material caused by the bad
Improve product quality (pressure, reduced product internal stress)
Extend mold life
No need to reserve flow path, reduce die size. Easy to set the gate position
Shortcomings
Rising mold costs
Maintenance warranty requires professional staff
Mold design should be fully tested
In the case of two-color mold manufacturing, it is necessary to use a hot runner
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:
1. The quality of strict injection products
2. A variety of plastic, multi-color co-injection process
3. The direction of the gate is a certain or vertical angle to the mold opening direction
4. Multi-layer mold One way to increase production without increasing the tonnage of the injection molding machine is to use multi-layer molds. That is, there are multiple mold sections on the mold. This mold is completely realized by the hot runner system.
5. The sprue opens inside the deep part. Some industrial products have very strict appearance requirements. The use of ten should not expose any traces of the gate. Small 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.
Mold Usage Hot Runner Benefits:
1. Shorten the molding cycle of parts. Many thin-wall parts produced with hot runner molds can be molded in less than 5 seconds.
2, save plastic raw materials, in the pure hot runner mold no production materials. It is an effective way to reduce material costs and material costs.
3, reduce fees and improve product quality.
4, eliminate the follow-up process, is conducive to production automation.
5, to expand the application of injection molding process.
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