Introduction to Hot Runner Heaters

A hot runner heater uses metal to generate eddy currents in an alternating magnetic field to generate heat, usually used in metal heat treatment and other fields.

Working principle of hot runner heater production

The principle is that when thicker metals are in an alternating magnetic field, they will generate current due to electromagnetic induction. After the thicker metal generates current, the current will form a spiral flow path inside the metal, so that the heat generated by the current flow is absorbed by the metal itself, which will cause the metal to quickly heat up. This equipment is an energy-saving device for pre heating or secondary heating of fuel oil, as well as a plastic melting channel for constant temperature heating. It is installed before the combustion equipment to achieve heating of fuel oil before combustion, reducing its viscosity at high temperatures (105 ℃ -150 ℃), promoting full atomization combustion, and ultimately achieving the goal of energy conservation. It is widely used in the pre heating or secondary heating of fuel oils such as heavy oil, asphalt, and clear oil, as well as in the rubber and plastic manufacturing industry.

Precautions for using hot runner heaters

(1) The component is allowed to operate under the following conditions:

A. The relative humidity of the air shall not exceed 95%, and there shall be no explosive or corrosive gases. (Except for explosion-proof heaters)

B. The working voltage should not exceed 1.1 times the rated value, and the casing should be effectively grounded.

C. Insulation resistance ≥ 1M Ω Dielectric strength: 2KV/1min

(2) The electric heating tube should be properly positioned and fixed, and the effective heating area must be fully immersed in liquid or metal solids, and empty burning is strictly prohibited. When scale or carbon deposits are found on the surface of the tube, they should be promptly removed and reused to avoid affecting heat dissipation and shortening its service life.

(3) When heating fusible metals or solid nitrate, alkali, asphalt, paraffin, etc., the operating voltage should be lowered first, and only after the medium melts can it rise to the rated voltage.

(4) When heating air, the components should be arranged in a cross and uniform manner to provide good heat dissipation conditions for the components and allow the flowing air to be fully heated.

(5) When heating nitrate, safety measures should be taken to prevent explosion accidents.

(6) The wiring part should be placed outside the insulation layer to avoid contact with corrosive, explosive media, and moisture; The lead wire should be able to withstand the temperature and heating load of the wiring section for a long time, and excessive force should be avoided when tightening the wiring screws.

(7) The components should be stored in a dry place. If the insulation resistance is lower than 1M Ω due to long-term storage, they can be dried in an oven at around 200 ℃ or heated by reducing the voltage until the insulation resistance is restored.

(8) The magnesium oxide powder at the outlet of the electric heating tube should be protected from pollutants and moisture infiltration in the use site to prevent leakage accidents from occurring

Hot runner heater components

The heating element is an important component of the hot runner system, and its heating accuracy and service life have a significant impact on the control of the injection molding process and the stability of the system. After the electric heating pipe is shrunk, the steel pipe becomes hard and needs to undergo good deformation. The electric heating tube must undergo high-temperature heat treatment to eliminate the mechanical tension of the steel, in order to easily bend the electric heating tube. The processed heating strip can be manually bent into the flow channel groove, with various shapes: heating rod, heating ring, tubular heater, hot runner heating tube, spiral heater (heating coil), 6 * 6, 8 * 8 square heating tube specifications, etc. Widely used for heating splitter plates, hot runner heating, etc. The product specifications and dimensions of Pansen Hot Runner Company can be customized.

The heating rod is made of special production processes and high-quality materials, which is durable and ensures efficient operation in tight spaces, even when the heating jacket temperature reaches 700 degrees Celsius. Manufactured according to the metric system and international standards, all models meet the quality inspection requirements of VDE0721, which can meet the needs of most machines, factories, etc. using heating elements

Type of hot runner heater

Hot runner heater, heating coil, spring heater, heating rod, heating tube, heating coil, heater, right angle heater, heating coil, etc

Analysis of Several Misunderstandings in Hot Runner Heaters

Myth 1: The thinner the better

Some customers blindly demand thinness when choosing heaters, and use it as a sign of the manufacturer's strength. In fact, a heater with a thickness of only 0.5 can be made without requiring power or service life, but the process is just a bit complicated.

Myth 2: Judging by Color

Some heaters in Europe and America have a grayish green surface, and some domestically produced heating coils have high brightness. In fact, these are all related to surface treatment or even cutting corners without the tempering process.

Myth 3: The softer the better

The surface of soft heaters is generally made of a special type of copper, and all processes are the same as those of other heaters. This type of copper material requires a high quantity every time, and the total market demand for soft heaters is not large, so general manufacturers are unwilling to produce it.

Myth 4: The higher the power, the better

The resistance of the electric heating wire in an electric heater is selected based on the set power, and the higher the power, the lower the total resistance. There is an appropriate range for the resistivity of electric heating wires. If the resistivity is too large or too small, short or long, thin or thick electric heating wires are required, which poses difficulties in manufacturing and using electric heaters of all sizes. An important parameter of electric heating wire is surface power. If the resistivity is too high and a certain current is applied, the surface power will also increase. So for low-power appliances, small diameter small current is chosen, but the size of the current depends on the size of the resistance, and the length and diameter of the heating wire are calculated.

If we blindly pursue high power, we need to increase the surface area to ensure that the surface power does not exceed the standard. At the same time, in order to ensure high power, there must be sufficient current, so there is a limit to power when the surface area is fixed! The quality of producing high-power electric heaters cannot be guaranteed.