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Advantages of internal heating of hot runner nozzles　　

Date：2024-09-09 Hits：296

Advantages of internal heating of hot runner nozzles　　

The choice of internally heated nozzles is very economical.

Anyone who is involved in the planning, production, operation or repair of injection moulds knows that it is important to control the heat distribution in the best possible way, which reduces the waste of materials and the downtime for repairs due to leakage of nozzles or poor quality of moulded parts.

Therefore, to eliminate the danger of overheating and leakage is a lot of people seek the policy, in the mould planning or production process, will be internally heated [hot runner] nozzles or molding injection molding machine nozzles for the overall thinking, has a very important economic significance, because they are conducive to the saving of money.

The primary reason for choosing internally heated nozzles to save money is that they are 100% sealed. The molten plastic does not leak outwards and does not damage the wiring in the channel or near the nozzle. However, with externally heated conventional nozzles, leaks and system damage can and do occur.

For example, if an externally heated nozzle leaks in a warm runner system, the leaking molten plastic will flow into the line passages and engulf them, clogging all nozzles and passages with a lot of plastic. If the complete heating system is affected, it can become a very expensive repair job.

In addition, the use of internally heated nozzles in the [warm runner system] requires few, if any, spare parts, because such nozzles do not leak. To emphasise this point, a large multinational OEM of caps and closures has used more than 200 internally heated multi-cavity warm runner systems for more than 14 years because the company has personally experienced the direct benefits of internally heated nozzles, which do not require any spare parts inventory, which is a real saving.

Because a heated runner system usually accounts for the majority of a mould's overall cost, some people always place special emphasis on the system's warranty, but they don't consider that frequent mould burn-outs or other problems can add to the costly downtime. The use of internally heated warm runner nozzles reduces the stress because they have the advantage of avoiding breakdowns compared to externally heated conventional systems. They act as a safeguard against downtime and parts replacement costs.

In most cases, internally heated warm runner nozzles can be retrofitted to existing warm runner systems. It should also be noted that the two halves of the combined warm runner nozzles offered on the market today have the same characteristics and they work extremely well.

Internal differences

The nozzles selected for external heating have the sensitive components of the heating system (e.g. thermocouples, heating coils, sleeves, etc.) mounted on the outside of the nozzle body. When the coil is heated it begins to expand, creating a gap between itself and the nozzle body, preventing it from making even contact with the nozzle body. Because of this, it is necessary for the coil to be heated at a higher temperature so that it can properly heat the plastic. Not only is there a risk of uneven heating, but the higher temperature also means that there is a risk of overheating and burning of the coil (resulting in heater failure).


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