With the increasing demand for plastic injection products, the application of hot runner technology becomes more and more extensive. The reason why the hot runner technology can advance so rapidly is that its own technical advantages play a very important role. In the practical application projects discussed below, it is especially applicable to the use of heat flow channel technology. The traditional cold flow channel mold cannot achieve these injection molding.

1. Multiple plastics and color injection

The traditional injection molding is on a set of mould forming a kind of plastic or color at a time, then you can use cold runner, or hot runner mold, but if you want to achieve a variety of plastic or a variety of color note, hot runner technology must be followed. Currently using hot runner with a variety of plastic, a variety of colors injection processing of the parts are many, such as the long-term preservation of advanced beverage bottle, beer bottle, is the sandwich structure with two plastic made by hot runner various types of plastic, injection processing, is a small amount of fresh oxygen insulation plastic clip in the outer plastic of cheaper.

In automobile manufacturing industry, by a variety of colors, such as red, orange, transparent color composition before and after the whole light is very popular at present, it must also be in the same mold hot runner systems were installed, which is a hot runner system injection of red, the other a hot runner injection of orange, under a hot runner injection system transparent color, etc. Obviously, it is impossible to use the traditional cold runner mould.

2. Items requiring separate control of multi-gate feed

Some larger parts require more (multiple gate) feed to form. However, after the use of multiple gate on the parts of the long will seriously affect the appearance of the fusion line. In order to eliminate these melt lines completely, the valve gate hot runner technology can be adopted. The usual injection molding is to open all gate at the same time. In order to eliminate the soldering line on the part, it is necessary to open or close different gate according to the mold filling condition. The conventional cold runner certainly does not provide separate controls for opening and closing individual gates. It depends on the heat channel technology.

3. Plastic injection products with strict quality requirements

For many medical plastic injection products, one of the most basic requirements is not to allow gate marks. Because of the gate mark may scratch the gloves and the skin of the medical staff, causing disease infection and so on. The solution is to adopt the valve gate hot runner needle valve system forming method in the hot runner technology to completely cut the gate mark. In recent years, generally speaking, the plastic product processing industry is not booming, but the medical plastic injection product processing is a unique one, and the use of hot-runner valve gate mold molding. Companies preparing to produce high-quality medical plastics should consider developing hot runner technology.

 

4. The gate is opened inside the deep part

Some industrial products are extremely strict in appearance and are not allowed to expose any gate marks when using them. Small parts such as lipstick pen covers for cosmetics, and large parts for automobile interior decoration are prohibited. At this point, the gate needs to be opened inside the part. When the depth of the part is too large, it is not possible to use the cold runner gate, but only use the hot runner nozzle into the inner part of the injection molding.

5. The direction of gate is at a certain or vertical Angle from the direction of mold opening

Sometimes in order to avoid the gate opening in positive affect beautiful parts and use, etc., often need to put parts on the side gate, at this time if the direction of the gate with the mould in the same direction, the gate of the intensity of mould will be very weak. It is better to open the gate at the Angle of vertical part side. For example, some large parts with complex shapes on cars often have the need to make the direction of gate and the direction of mold opening at a certain Angle. This can only be done with a heat channel. It is difficult to pull the long cold runner and gate out from the Angle due to the open-die action.

6. Preparation of preformed bottle embryo (such as PET bottle embryo)

In daily life, people use a lot of beverage bottles by injection molding method to produce PET pre-formed bottle embryo, and then blow molding method to make work beverage bottles. The production of PET preformed bottle embryo is all realized by heat channel technology. At present, the world's largest PET preformed bottle embryo mould can produce 144 bottle embryos at a time.

7. Multi-layer mold

 

8. Mass production automation projects

Because there are always some cold runner materials that need to be recycled and processed when using the cold runner mould, it is difficult to combine with the automation technology to carry out large-scale automatic production. The adoption of heat flow channel technology should be considered if the productivity is to be improved greatly. For example, in the international heavy packaging industry, such as food packaging boxes and plastic bottle caps, the consumption of plastic products is huge. These plastic food packaging boxes and plastic bottle caps are made of a hot runner mould for rapid and automatic mass production. Itself for many thin-walled parts, parts in the mold of the required cooling time is short, then USES the hot runner gate valve type can eliminate time-consuming runner and gate, cooling time, which can speed up the production.