Hot Runner Polymer Precision Injection Molding
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Hot Runner Polymer Precision Injection Molding

Since the 1960s, the hot runner system has been an integral part of the plastic injection process. Its ability to reduce waste and increase cycle speed has made it an attractive option for many companies.
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Hot Runner Polymer Precision Injection Molding


Since the 1960s, the hot runner system has been an integral part of the plastic injection process. Its ability to reduce waste and increase cycle speed has made it an attractive option for many companies.


What is Hot Runner Polymer Precision Injection Molding?

A hot runner system uses a heated liquid to deliver plastic to a series of mold cavities. This procedure works by transporting the plastic through the machine's nozzle. The plastic is then transported through the machine's internal channels, which are known as runners.


Hot runner vs cold runner Polymer Precision Injection Molding


Hot Runner Polymer Precision Injection Molding

Today, most plastic injection molding is done in one of two ways; hot runner systems and cold runner systems. Although the two systems have their own differences, one of the most crucial differences is that hot runners can inject plastic directly into a part instead of using a heated liquid. This allows the plastic to remain hot throughout the entire process, which means the mold can be cycled quickly. Through the use of a hot runner, the resin and the runners remain hot during the injection process, which means the only component that's removed is the part itself. This process allows the mold to be cycled again quickly, which allows for faster production and lower waste. Also, it allows for better-looking products due to the smaller injection point.


Although both systems are more advantageous than others, the advantages of the hot runner system are usually outweighed by its higher cost. Also, the setup costs for a hot runner system are higher. Knowing the weaknesses and advantages of both the hot runner and the cold runner systems is very important to ensure that the proper product is molded.

In general, hot runners are ideal for projects like:

-Cell phone cases

-Bottle caps

-Projects that require a high volume of inexpensive parts.


Cool Runner Polymer Precision Injection Molding

Cold runners are the most common type of runner used for plastic injection molding. They introduce plastic into a central channel through which the plastic flows into the runners. Since cold runners are designed to continuously cool the plastic, they tend to reduce cycle times and remove more impurities than hot runners. A cold runner system maintains its temperature by continuously cooling the plastic in its cavities and runners. This process helps prevent the plastic from getting too hot and causing the cycle time to accelerate.

Cold runners are a good choice for projects producing:

-Electronic housings and coverings where blemishes can be hidden

-Keyboards

-Lower volume production


How does Hot Runner Polymer Precision Injection Molding work?

Unlike cold runners, hot runners do not create crystals or lumps of plastic. This procedure is also beneficial for projects that require high volume production. The advantages of hot runners over cold runners include reduced cycle times and a reduction in plastic waste. Also, this system eliminates the need for a sprue system. The lack of a sprue system makes hot runners more efficient. It allows the machine to trim the product's final product without causing it to get cluttered.


The Hot Runner Polymer Precision Injection Molding Structure

A hot runner mold system is an assembly of many different parts:

-Manifold, generally heated by electricity

-A number of controllers, determined by the number of injection points

-Thermostat to control the heat of the manifold

-Plate, where the runners sit. This component is also heated


Hot Runner Polymer Precision Injection Molding Price

Although hot runner systems have their advantages, they also have a higher price tag. In most cases, the cost of a hot runner system is around $5,000 to $20,000 in China. Beyond this, the cost of a hot runner system depends on the number of injection points that are included in the mold. These points, also known as drops, are the cavities that are filled using the heated plastic. The more cavities are filled, the more expensive the system is. This is why it is important to understand the costs involved in a hot runner system before committing to one.


Types of Hot Runner Polymer Precision Injection Molding

Hot runner systems are commonly used for mass production of simple parts. Hot tip is considered the most economical type of hot runner.


Hot tip hot runner system

Hot tip systems are more economical than valve gate systems. They can be used for mass production of various parts.


Valve gate hot runner system

A valve gate system is an injection point that automatically closes when the plastic is injected. This method leaves no visible traces on the surface of the product. It is also more cost-effective than the general-purpose hot runner. A valve gate system is also ideal for products that require great looks. It saves a huge amount of money compared to a hot runner.


The future of injection molding

With the evolution of injection molding technology, hot runners have become the future of injection molding. The advantages of hot runner systems over traditional ones have strengthened their role in modern injection. Having a better understanding of them can help you make informed decisions in the future. With a greater awareness of hot runner systems and what they can achieve, it becomes possible to make more informed decisions in the years ahead. If you are considering an injection system for your project, contact TEAM MFG for a quote. We will help you get started with the right one.


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