Knowledge of hot runner in plastic mold

Hot runner concept

The hot runner system is divided into an adiabatic runner system and a miniature semi - hot runner system. The design of adiabatic runner is complex, but the effect is good and the maintenance cost is very low. Micro semi - hot runner structure is simple, stable, easy to use, low failure rate, because of the simple structure and low maintenance cost, the stability of production has a greater guarantee.

Hot runner classification

Open (for micro semi - hot runner), needle - valve (for adiabatic runner).

Hot runner system generally consists of hot nozzle, splitter plate, temperature control box and accessories. Hot nozzles generally include two types: open hot nozzles and needle valve hot nozzles. As the hot nozzle form directly determines the hot runner system selection and mold manufacturing, the hot runner system is often divided into open hot runner system and needle valve hot runner system. The splitter plate is used in the case of multi-cavity or multi-point feed or single-point feed with offset feed level. The material is usually P20 or H13. The splitter plate is generally divided into two categories: standard and non-standard, and its structure is mainly determined by the distribution of the cavity on the mold, the arrangement of the nozzles and the position of the gate. The temperature control box includes main engine, cable, connector and wiring male and female socket. Hot runner accessories usually include: heater and thermocouple, runner seal ring, connector and junction box.

Advantages of hot runner mould

Hot runner mould is widely used in the developed countries and regions of the world. This is mainly because the hot runner mold has the following remarkable characteristics:

1. Shorten the molding cycle of parts

Due to no cooling time limit of the runner system, the parts can be timely ejection after molding and curing. Many thin-walled parts produced in hot runner molds take less than 5 seconds to complete.

2. Save plastic materials

In the mold of pure hot runner, there is no cold runner, so there is no production cost. This is especially important for applications where plastics are expensive. In fact, the major international hot runner manufacturers have developed rapidly during the world's expensive oil and plastic raw materials. Because hot runner technology is an effective way to reduce material cost and material cost.

3. Reduce waste and improve product quality

hot runner mold

4. Eliminate subsequent processes, which is conducive to production automation.

After the hot runner mould is formed, the parts are finished products, no need to trim the gate and recycle the cold runner. Facilitate production automation. Many foreign manufacturers combine hot runner with automation to greatly improve production efficiency.

5. Expand the application of injection molding process

Many advanced plastic molding processes are developed on the basis of hot runner technology. For example, PET pre-molding, multi-color co-injection in the MOLD, multi-material co-injection process, STACK MOLD, etc.

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