(1888PressRelease)
April 27, 2009 - The rigid screwed-on connection is a common way to connect the co-extruder with the main extruder. But it has its drawbacks: Rigid connections have a multiplicity of connection elements, which normally need to be individually heated, insulated and controlled. And in most cases the co-extrusion of profiles has to be flexible, i.e. a wide range of different co-extruded profiles must be produced. The co-extrusion tooling determines the point of co-extrusion which can differ depending on the design and shape of the profile, and the tooling system itself. The rigid steel connection is basically fixed to one position and arrangement. With a rigid connection there is always the danger to to damage the tooling while pushing and adjusting the co-extruder in order to find the right position. Many extrusion dies get damaged during this push and pull adjustment. However, the rigid connection has an advantage when it comes to high temperature and pressure. Here the rigid steel construction shows almost no limits.
The flexible connection considerably simplifies tool change and maintenance. The number of connection elements is reduced to a minimum. The co-extruder can be placed and connected in several different positions, either from the side, top or even bottom. And it is much easier for the operators to connect the co-extruder after cleaning or re-positioning. In addition: Very often the co-extruder are smaller in size with a lighter base frame with the tendency to vibration. The flexible heating hose can compensate possible vibrations of the co-extruder.
The inner pressure hose of such a flexible hose is made from PTFE with a maintenance-friendly outer jacket made from PA. The custom-made hoses can be operated at up to 250 degree C at a maximum pressure of 210 to 275 bar. They are available in various lengths with different kind of connection fittings.
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