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Hot Runner System

hot runner system
Yichuan series preform injection mold adopts specially designed hot runner system to achieve ideal and prompt heating effect for preform production. We are hot runner system manufacturer, hot runner system supplier, hot runner system provider, hot runner system maker in China.
A hot runner system (also hotrunner system, hot-runner system) is an assembly of heated components used in plastic injection molds that inject molten plastic into the cavities of the mold. (The cavities are the part of the mold shaped like the parts to be produced) By contrast, A hot runner system usually includes a heated manifold and a number of heated nozzles. The main task of the manifold is to distribute the plastic entering the mold to the various nozzles which then meter it precisely to the injection points in the cavities.

According to the characteristics of our own mold , Yichuan synthesized the technology from the top world hot runner makers and developed the suitable hothalf system for the mold on 2012.

1. The manifold and the nozzle is sealing separated, which will not affect the nozzle part when the manifold leakage happened.
2. The nozzle is sealed divide into group, which will not affect the whole nozzles even if one nozzle leakaged.
3. Replace the heating ring ,mouth of hot nozzle, sealing nut on the injection machine directly.
4. Gate blocking can be cleaned on the injection machine directly also.
5. Hothalf used high strength steel, which can be guaranteed no leakage will be happened.

Types of Hot Runner System
There are many variations of hot runner systems. Generally, hot runner systems are designated by how the plastic is heated. There are internally and externally heated drops and manifolds.
Externally Heated Hot Runners
Externally heated hot runner channels have the lowest pressure drop of any runner system (because there is no heater obstructing flow and all the plastic is molten), and they are better for color changes none of the plastic in the runner system freezes. There are no places for material to hang up and degrade, so externally heated systems are good for thermally sensitive materials.

Internally Heated Hot Runners
Internally heated runner systems require higher molding pressures, and color changes are very difficult. There are many places for material to hang up and degrade, so thermally sensitive materials should not be used. Internally heated drops offer better gate tip control. Internally heated systems also better separate runner heat from the mold because an insulating frozen layer is formed against the steel wall on the inside of the flow channels.

Insulated Hot Runners
A special type of hot runner system is an insulated runner. An insulated runner is not heated; the runner channels are extremely thick and stay molten during constant cycling. This system is very inexpensive, and offers the flexible gating advantages of other hot runners and the elimination of gates without the added cost of the manifold and drops of a heated hot runner system. Color changes are very easy. Unfortunately, these runner systems offer no control, and only commodity plastics like PP and PE can be used. If the mold stops cycling for some reason, the runner system will freeze and the mold has to be split to remove it. Insulated runners are usually used to make low tolerance parts like cups and frisbees.

Hot Runner System Advantages
They can completely eliminate runner scrap, so there are no runners to sort from the parts, and no runners to throw away or regrind and remix into the original material. Hot runners are popular in high production parts, especially with a lot of cavities.
Advantages Hot Runner System Over a Cold Runner System include:
no runners to disconnect from the molded parts
no runners to remove or regrind, thus no need for process/ robotics to remove them
having no runners reduces the possibility of contamination
lower injection pressures
lower clamping pressure
consistent heat at processing temperature within the cavity
cooling time is actually shorter (as there is no need for thicker, longer-cycle runners)
shot size is reduced by runner weight
cleaner molding process (no regrinding necessary)
nozzle freeze and sprue sticking issues eliminated
Hot Runner System Description

Fast cycling due to specially designed cooling circuits.
Standard interchangeable mold components; replacement parts available within 72 hours.
Rugged design for long life.
Auxiliary tapers that reduce mold wear by pre-aligning the mold halves prior to the engagement of the neck ring tapers.
Roller cams that actuate both the opening and closing actions on the thread splits.
Lowest cavity-to-cavity weight and dimensional variation as a result of best-in-class manufacturing machinery and processes.
Water hoses that are manifolded at the bottom of the mold, eliminating potential for water marks on preforms.

Hot Runner System Features
Shorten the processing cycle, raises the efficiency
Replaces the cold runner, thus does not produce the crude material, does not need to crush again.
Enhances the product uniformity, improves the product quality.
Improves the gate outward appearance.
Reduces the product aberration quantity, reduces the product distortion
Uses the valve gate, injection molding step-by-step,produce different specification size the components series.
Enhances the more processing process control, in order to make the precise adjustment to the injection molding.
The hot runner system is composed generally by three parts: main feed inlet, hot divergence board, hot spray nozzle. Sometimes the system includes the cut-off valve, uses in closing the runner, improves the product surface quality, permits using the large gate.
Hot Runner System Process
Plastic Injection Mold For Injection Cycle
Plastic Injection Mold For Mold Open Cycle
Plastic Injection Mold For Part Ejection Cycle
Hot Runner System Picture
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