FRIEDR. FREEK GMBH - Electric Heating Elements

Especially for high-cavity PET plastic injection moulding there are various industry standards of clamp-band nozzle heaters available. Most common are the Axial Clamp-Band Heater and the Two-screw Clamp-Band Heater. Our HotCoil cable heaters with clamp band represent a highly demanded and very flexible clamping system, especially for heating larger nozzles and bushings with high power. The size-variable customizable clamp bands counteract the heating's thermal-related "lifting ambition" during heat-up and thus effectively prevent a possible critical overheating. For an even better protection all HotCoil heating elements can also be provided with an integrated thermocouple. As alternative to our standard clamping mechanism with welded clamping elements a space-saving lug clamping mechanism can be supplied.

Besides its own systems Freek also manufactures original Rosemount-systems that can also be used as "Husky-replacement heater" (see spare part cross-reference list). For example the two screw clamp band (FB) and the axial clamp band (FE). Both systems can be supplied with MicroCoils in "Rosemount style" (Ø 1,4 mm) as well as MicroCoils in "Freek style" (1,3 x 2,3 mm).

Besides their own clamp-band designs Freek also manufactures original Rosemount clamp-bands that can be used as "Husky-replacement heaters" (see spare part cross-reference list). For example the two screw clamp band (FB) and the axial clamp band (FE). Freek has all the various industry standards for clamp-band nozzle heaters in Ø19,05 and Ø22,40 in their assortment, too. HotCoil minitubular heaters with clamp band are a highly demanded and very flexible clamping system, especially for heating larger nozzles and bushings with high power. The size-variable customizable clamp bands counteract the heating's thermal-related "lifting ambition" during heat-up and thus effectively prevent a possible critical overheating. For an even better protection all HotCoil heating elements can also be provided with an integrated thermocouple. As alternative to our standard clamping mechanism with welded clamping elements a space-saving lug clamping mechanism can be supplied.

Our Locking System provides a quick, easy and reliable clamping of the heating element on the nozzle to be heated. It facilitates an effective heat transfer, as the inside sheath is pressed to the nozzle with a high level of precision creating an interference fit. Due to the method of construction of the lock, installation is possible in the restrictive space of small cavities. The lock can be operated quickly and efficiently with simple readily available tools.

Spare Heaters suitable for hotrunner nozzles of familiar OEMs: Clamp Band Heaters for Husky Art-No. 520156, 521334, 534192, 534445, 534233, 534234 Kappa heaters for Husky 1250 series,(Bi-Metal, Bi-Metal with TC, Ultra 1250) for Husky 750 series (Bi-Metal, Bi-Metal HTR S/A, Ultra 750) for Husky 500 series (Ultra 500, Copper Ultra 500) Reflection tube nozzle heaers for Husky 500 series (500 HTM Brass) for Mastip MX series (MX13, MX16, MX19) for Mastip DX/MJ series (DX09, MJ09) for Mastip

Thermo Sensors are needed in any controlled heating process. For various applications different types of thermocouples are obtainable. Most common are thermocouples (TC) and resistance sensors (RS). Both types are available in the same executions as a matter of princible. For non-contact measuring infrared sensors are the rights choice, either in stationary executions or as portable measuring instrument.

Open wire heating elements are the best solution for air heating when used in fans. Because of our longlasting experience in this field, we can offer you a series construction in most cases. To use our open wire or coil heating elements in air, the installation of a cut-out is necessary (heat accumulation). The connection is done by a plug at the element (Faston 4,8 or 6,3) or by a cord set. Our extended range of air heater variants comprises: -> Heaters for Laundry Dryers (series & spare parts types) -> Heaters for Cross Flow Fan -> Heaters for Powerful Radial Blowers -> Heating Crosses & Special Designs Various special designs for airflow heating, deploying heater spirals on insulating mica support, are available. They are required when the available space for installation is limited and defined geometrical air ducts do not exist. All special open wire heaters are individual designs, i.e. custom-made.

Heating bands are the ideal solution for the heating of tubes an cylinders. Mica band heaters, frequently used as nozzle heaters, are made with a plastic-tight stainless steel casing. Such mica heating bands are in many dimension available from stock. The Ceramic heating band type is suitable specially for applications with high watt density and therefore for higher temperatures. Ceramic band heaters, also known as ceramic ring heaters or cylindrical ceramic sectional heaters, are attached to the contact surface by means of a clamping mechanism. A preferred field of use for ceramic band heaters is the heating of plasticising cylinders, bushings and nozzles of injection moulding machines and screw barrels of extrusion machines. For thermal optimization and process control ceramic band heaters can also be offered with insulation jackets or air cooling.

Micanite is a kind of insulation paper which is impregnated with a heat resistant binder and afterwards pressed in several shifts under heat and high pressure to plates. This material is heat resistant up to 350 °C, as special construction (Phlogopit) up to 450 °C, and is used for the wire wound formers as well as for the encapsulating cover plates of mica surface heaters. Because of the typical "sandwich"-construction of Micanite Flat Heating Elements and their high watt density it is necessary to use a platen to press the mica heater onto the surface to be heated. Established on the market for round Flat Heating Elements are some standard dimensions (Ø 58 / Ø 65 / Ø 80 / Ø 100 / Ø 160 / Ø 260 mm). But normally Micanite Surface Heating Elements are constructed on customer's request. Mica heaters can be metal sheathed for higher mechanical stability. This makes the heater flexible, so that it is also possible to build a band heater.

Ceramic Insulated (Band) Heaters are predestined for high-temperature applications beyond 450 °C, for example for pipe heating in process heat technology, especially when gases are involved. Ceramic insulated sectional surface heating elements are also brought into action where a heat storage capacity is needed, as in hot plates the case. With the heating surface of ceramic flat heaters being composed by small-limbed ceramic elements with aligned holes in the centre for the resistance coils to be fed through, ceramic sectional heating mats are also applicable for bent or cylindric surfaces. Like Micanite insulated flat heating elements also Ceramic insulated elements can receive a metal sheath. The latter provides additional protection against mechanical load and allows for attaching connection boxes. Another advantage is the easy installation by means of mounting holes in the metal cladding.