Coil heaters

Coil 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.

Coil heating elements are made in a stainless steel coat. Depending on the customer’s needs, they can be delivered in a simple form or for self-winding.

Application
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  • Food industry (molds)
  • Chemical industry
  • Construction
  • Packaging industry
  • Foundry industry
  • Wood industry
  • Footwear industry
  • Furniture industry
  • Pharmacology
  • Plastic industry (molds, injection molding machines, stamps)
  • 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.: 600oC*
  • Diameter: min. ø 5 mm*
  • Dimensions (possibility of fitting a thermocouple): 2.5 x 4.2 mm, 3.5 x 4.8 mm, 3.0 x 5.1 mm, 4.6 x 6.5 mm, ø 4-6 mm
  • Dimensions (no possibility of fitting a thermocouple): 2.8 x 3.7 mm
  • Length: 50-3000 mm (expanded as a simple element)*
  • Shield material: AISI 304, AISI 321*

 

*The given 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 for making special-purpose heaters. Their power and dimensions cannot be achieved in the standard production process.

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

 

General structure
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Coil heaters are made of stainless steel AISI 304 and AISI 321 and terminated by a tightly welded bottom. 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.

 

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;
  • Possibility of installing a temperature sensor (type K thermocouple, type J thermocouple);
  • Cold zones (unheated) depending on the diameter of the heater (min. 30 mm from the wires side and 5 mm from the bottom side).

Types of heaters
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Current outputs
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– PTF 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 in order 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)

Optional execution
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  • Clamp – thanks to the band, the heater adheres better to the heated element and does not move (it is possible to adjust the diameter of the heater to the element).
  • Tubular casing – thanks to the band, the heater adheres better to the heated element and does not move (constant external and internal diameter).