Germany
Manufacturer/ Producer
FRIEDR. FREEK GMBH
Germany
Polyester heaters also referred to as Polyester film heaters or Polyester foil heaters consist of an electrically conductive ink between two insulating respectively carrier layers of polyester. With a maximum size of 600 x 1000 mm, their average height is only 0.2 mm. As the picture examples show, practically any shape and type of cut-out is possible. Polyester foil heaters are resistant to permanent temperatures of up to 90°C (max. 100°C for short periods). It is generally not possible to predict which temperature a Polyester heating element will reach in the application, as there are extremely many influencing factors. These include not only the power, but also the mass and type of goods to be heated, the ambient temperature, air currents, the type of mounting and, of course, the control technology. Typical applications for Polyester heaters are e.g. cup warmers in coffee machines, mirror heaters, plate heat exchangers, flat applications with a target temperature below 90°C.
FRIEDR. FREEK GMBH
Germany
Occasionally also these terms are used for cartridge heates: heating cartridge, insertion heaters, spiral cartridge heaters. As a rule cartridge heaters consist of a cylindrical stainless steel tube and thus provide a high corrosion prevention. There is a heating wire inside which is wound onto a ceramic core. The number of coils varies depending on the power. In order to avoid a short-circuit, the cartridge heater is filled with magnesium oxide and compressed afterwards. Highly compacted they reach a surface watt density of up to 50 W/cm² and withstand highest stress. In the plastics industry cartridge heaters are used in hot runners in order to temper thermoplasts during injection moulding processes. Other areas of applications for process heat are e. g. packaging, diecasting or continuous casting in which zinc or aluminium are processed. Further applications are to be found in mechanical as well as medical and laboratory engineering.
FRIEDR. FREEK GMBH
Germany
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.
FRIEDR. FREEK GMBH
Germany
Flexible silicone heaters are resistant to permanent temperatures up to 200°C, with self-adhesive foil 180°C should not be exceeded. Higher temperatures of 230°C are possible for a short time without destroying the heater. The temperature that will be reached within the application, generally is not easy to predict, as there are many influencing factors. In addition to the power, resp. surface load, this also includes mass and type of the material to be heated (thermal conductivity, surface quality, etc.) installation / assembly situation (bonded, vulcanised, clamped, etc.), ambient temperature, air movement and, of course, the control technology used. Application examples for silicone heater mats include: canteen kitchen technology / catering, anti-fog and anti-freeze applications, tool or plate heating in machines, 3D printers, laboratory equipment, composite materials repair, joint curing and much more.
Friedrich Freek GmbH is a family-run company based in Germany. We develop, produce and sell electrical heating elements. As a globally recognised process heating specialist, we have been supplying reliable high-quality products proudly made in Germany from a single source since 1950. Freek supplies its heating elements to renowned companies across a variety of sectors. The manufacturing of highly innovative HotMicroCoils, often employed as nozzle heating elements for hotrunners in plastic injection moulding, is one of our most significant business areas today. However, our customers also benefit from our wide product assortment, which includes all types of industrial heating elements. In addition to the HotMicroCoils, we also supply: Tubular heating elements, heating cartridges, infrared heaters, surface and film heating elements, heating elements for air heaters as well as the accompanying measurement and control technology for this. Thanks to intelligent value creation, innovative production concepts and a wealth of expertise, Freek is able to serve more than 1000 customers each year
With 3.330 exhibitors from 63 countries, K in 2019 was the undisputed flagship event of the industry and hence the ideal business and contact platform for inspirational ideas and forward-looking decisions. K is the world's key flagship fair in terms of its quantitative and qualitative performance characteristics. Visit us in hall 11 stand A01
Manufacturer/ Producer
Sudetenstraße 9
58708 Menden - Germany