Ring heaters

Ring heaters are widely used in industry. They are used, among others, in hot runner systems and in places where standard band heaters cannot be used (due to the small diameter of the element and high power). They are used for plasticizing plastics in injection molding machines and for heating selected sections of industrial installations. They achieve more power than band heaters. They are also more airtight, and thus – resistant to spills, e.g. with plastic.

The reinforced brass construction protects the heating element against mechanical damage and ensures optimal heat transfer and perfect fit to the nozzle housing. The stainless steel outer surface effectively protects the brass casing of the heating element, and the power distribution allows optimal heat delivery.

Application
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  • Food industry (molds)
  • Chemical industry
  • Construction
  • Packaging industry
  • Foundry industry
  • Wood industry
  • Footwear industry
  • Furniture industr
  • Pharmacology
  • Plastic industry (molds,)
  • Automotive industry (injection molding machines, molds)

Characteristics
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  • Max power: 25 W/cm2 (high power compared to a small area)*
  • Voltage: according to customer order*
  • Operating temp.: 500oC*
  • Diameter: ø 2-100 mm*
  • Length: 20-400 mm*
  • Shielding material: AISI 304, AISI 321

 

* The values (parameters) are examples and do not constitute an offer within the meaning of art. 66 of the Civil Code.

Each heater is designed individually.

Technology
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Advanced production technology and high quality materials allow to make special-purpose heaters. Their power and dimensions cannot be achieved in the standard production process. Due to the reinforced construction, ring heaters are very resistant to mechanical damage.

Technological processes
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  • Cutting the pipe
  • Winding the resistance wire
  • Backfilling the heating element
  • Welding the bottom covering the pipe
  • Rolling
  • Forming the heater
  • Sealing
  • Current connections
  • Design
  • Making a winding core

 

General structure
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Ring heaters are made of AISI 304 and AISI 321 stainless steel and brass. Thanks to the applied production technology, they achieve high power in relation to the heating surface. The use of the highest quality materials ensures high precision and durability of the product. Subjecting the ring elements to appropriate technological processes guarantees a high operating temperature, and the additional use of the sensor allows to achieve a precisely defined temperature and protects the heater from damage. The welding process guarantees maximum tightness.

Characteristics of the elements:

  • Nickel-chromium resistance wire, properly compacted with high quality magnesium oxide;
  • Current output in the form of a copper conductor in a PFA coating or a nickel conductor in a fiberglass braid;
  • Temperature sensor installation (type K thermocouple type K, type J thermocouple);
  • Cold zones (non-heated) depending on the diameter of the heater (min. 30 mm from the wiring side).

Types of heaters
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Current outputs
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– PTFE sheathed cables

– Fiberglass braided cables

– Wires in fiberglass sheath

– Wires in the pipe

– Steel braided cables

Heating zones
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It is possible to make heaters with uneven distribution of coils to obtain the desired distribution of thermal power.

Temperature sensors
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In coil heaters it is possible to use a temperature sensor:

  • type J thermocouple (up to 650°C)
  • type K thermocouple (up to 1000°C)