Using a Hot Runner can bring you higher returns 1. The use of hot runner saves more costs. The higher the material price, the more waste materials at the nozzle, and the greater the product output, the more cost savings will be achieved by using hot runner.
2. The sprue material requires storage, crushing, and power consumption, which will reduce product quality and increase 1-2 manpower. The hot runner has no spout, which saves labor and has better product quality.
3. The three-plate mold is easily damaged due to the movement of the nozzle plate. After switching to a hot runner, the mold has a longer life and more stable quality.
Hot runners can be produced in larger quantities 1. Since the hot runner system has no water inlet, the injection time and cooling time can be greatly shortened. The use of the hot runner system can shorten the molding cycle by 20%-25%.
2. The use of hot runner systems can achieve the
injection molding of more cavity products, which can increase production capacity by at least 25%.
3. The internal pressure loss of the hot runner system is small, the internal stress of the product is small, and the surface quality and mechanical properties of the product are better.
The structure of the hot runner mold is roughly the same as that of the fine nozzle. The biggest difference is that the runner is located in one or more hot runner plates and hot spouts with constant temperature. There is no cold material to demould, and the runner and gate are directly on the product;
Therefore, the runner does not need to be demoulded. This system is also called a nozzle system, which can save raw materials. It is suitable for situations where raw materials are expensive and product requirements are high. Design and processing are difficult, and mold costs are high.
Hot runner
injection mould system, also known as hot runner mould system, mainly consists of hot runner sleeve, hot runner plate, and temperature control electrical box. Our common hot runner plastic injection mould systems have two forms: single-point hot gate and multi-point hot gate.
Single-point hot gate uses a single hot sprue sleeve to directly inject molten plastic into the mold cavity. It is suitable for
plastic molds with a single cavity and a single gate; multi-point hot gate branches the molten material to various locations through a hot runner plate. The heat is divided into the sprue sleeve and then enters the mold cavity. It is suitable for single-cavity multi-point feeding or multi-cavity molds.
Advantages of hot runner systems 1. There is no nozzle material and no post-processing is required, making the entire molding process completely automated, saving working time and improving work efficiency.
2. Small pressure loss. The temperature of the hot runner is equal to the temperature of the nozzle of the injection molding machine, which avoids surface condensation of raw materials in the runner and reduces injection pressure loss.
3. Repeated use of nozzle materials will degrade the performance of plastics, but using a hot runner system without nozzle materials can reduce the loss of raw materials, thereby reducing product costs.
4. The temperature and pressure in the cavity are uniform, the stress of the plastic parts is small, and the density is uniform. Under smaller injection pressure and shorter molding time, better products can be injection molded than ordinary injection molding systems. It can show its advantages even more for transparent parts, thin parts, large plastic parts or high-demand plastic parts, and it can produce larger products with smaller models.
5. The hot nozzle adopts standardized and serialized design, equipped with various optional nozzle heads, and has good interchangeability. The uniquely designed and processed electric heating ring can achieve uniform heating temperature and long service life.
Disadvantages of hot runner system application 1. The closing height of the overall mold is increased. Due to the installation of hot runner plates, etc., the overall height of the mold is increased.
2. Thermal radiation is difficult to control. The biggest problem with hot runner is the heat loss of the runner, which is a major issue that needs to be solved.
3. There is thermal expansion, and thermal expansion and contraction are issues we need to consider when designing.
4. The cost of mold manufacturing increases, and the price of standard parts of the hot runner system is higher, which affects the popularity of hot runner molds.
