Screw-in Tubular Heaters

Finned Tubular Heaters are the ideal solution for air or gas flow heating processes. The ribs enlarge the heat-releasing surface significantly. Basis of the finned tubular heaters are our 8.5 mm tubular heaters. The outer diameter of the fins is 28 mm. The elements can be delivered straight, U-shaped or circular (special design on request). Tubular heater as well as fins are made of stainless steel, the standard for the tube is 1.4828 (other materials possible as in chapter Round Tubular Heaters), the fins are normally made of 1.4301 (1.4571 on request).

Square stainless steel tubular heaters BASE-flex (1.4541) are a reliable industry standard for the use in heating platens and manifolds. In contrast to traditional tubular heaters with a round section which have to be bent by machines, square BASE-flex can be fitted into any rectangular groove with simple hand tools. Moreover, the square shape results in a bigger heat emitting area of up to 80% compared with a corresponding round section. Finally, the easy manual mounting saves the usually high technical expenditure for casting-in / soldering / cementing of bent round tubular heaters. A soft version of the BASE-flex, the NICKEL-flex (2.4068) is available as special execution. Due to the soft, easy to form nickel material, the NICKEL-flex is suitable for manual mounting with hand tools in round sections, too. Furthermore, Nickel has a better capability to conduct heat compared with stainless steel.

HotMicroCoils have an exceptional capacity for being shaped - even in three dimensions. Many special winding patterns and geometries apart from the purely cylindrical are thus possible, allowing heating close to the contours of all manner of surfaces. Applications include hot runner manifolds, heating plates and hot die stamps. The shaped heating elements thus obtained can be used in two principal ways: either placed over the surface to be heated (firmly bonded by soldering, force-fitted, pressed or otherwise appropriately joined) or pressed into a positive fit in grooves in the surface to be heated. The second of these alternatives is also becoming more widely accepted in plastics processing, as it offers the best heat transfer because the heating area is the greatest (see also Freek Heat Transfer System). Since not all our customers have the necessary equipment and experience to press the HotMicroCoil elements into the contours of the surfaces, Freek also offers this as a service.

Square cartridge heaters are used where much power has to be installed near the surface of a tool, e.g. in cutting knives, sealing stations or hot plates. With a soft, malleable condition in stainless steel or nickel sheath square cartridge heaters can easily be pressed into common milled rectangular grooves. Apart from the advantageous heat transfer over ¾ of the sheath, it is not necessary to cement or cast in the heater which is imperative for round cartridge heaters. Unlike tubular heaters which are also available in square sections (see chapter Flexible Heating Pipes), the square cartridge heaters have the termination on one side and can be loaded with 16W/cm² (2.5W/in²) due to their special inside construction.