In process engineering with planetary roller extruders, not only tempering and speed but also the type and design of exchangeable mechanical components of the process section have a serious influence on the behaviour of the extrusion mass. Design size of the extruder, overall length of the processing section, number, length and type of the used planetary spindles as well as the existing of dam rings between the roller cylinder modules and their inner diameter influence the melting and mixing behaviour of the mass as well as the dwell time, friction and heating behaviour. Of course, the physical properties of the raw material to be extruded, such as density, humidity, melting point, viscosity and temperature, as well as the degree of filling of the corresponding roller cylinder module, also play a decisive role in the extrusion process.
In order to generate a stable extrusion process with consistently high product quality, a number of factors and influencing variables must be taken into account. If only one of the factors is changed, the extrusion result always changes too. Even the modification of small details, such as e.g. the inner diameter of an intermediate stop ring, the mixing ratio or the temperature of raw materials, may have a serious influence on the quality of the product, especially for complex processes.
Not all rubbers are the same. There is a variety of products for different applications made of different types of rubber. In technical jargon they are usually called elastomers or elastomer products.
Process technology information for the processing of rubber
Depending on the requirements of the end product or intermediate product, different extrusion processes can be applied in the processing of rubber. For different rubber processes, various solids, e.g. caoutchouc, resin, carbon black, chemicals, etc., are fed into the planetary roller extruder as granulate or powder according to the recipe.
Liquid components, e.g. crosslinkers, oil, plasticizers, colours, additives, etc., can be injected into the process at different points of the process section, in different temperature zones. Depending on the process, the configuration of the corresponding extruder, the process temperatures and the type of material feeding and degassing can also vary greatly.
For technical questions, please contact our service department or you are welcome to use the following contact form.
L-WE 30 - a new extruder generation for the laboratory scale
The modular extruder system of ENTEX has been complemented with the Pharma Laboratory Extruder of size 30. This means that the advantages of the planetary roller extruder - absolute temperature control and suitable mixing of active substances, low-shear thin-layer rolling-out, large surface exchange - can now also be applied in material-critical areas. With this, ENTEX allows now to process also material quantities of several hundred grams per hour.
Did you know that we have registered a new property right?
The ENTEX system is enriched by a further element – ERMO (degassing reaction module) is a world innovation that further enhances the efficiency and versatility of the ENTEX planetary roller extruder.
This latest addition to the modular system of ENTEX offers a significantly increased process chamber volume in comparison to the conventional cylinder assembly of the respective series.
It has been developed specifically for degassing applications. Here, free large-scale process surfaces and generously dimensioned flow cross-sections are decisive. ERMO maximizes these aspects without significantly changing the size of the extruder.
But the advantages of ERMO can also be used for the addition of fillers with particularly low bulk density – also here, the largest possible free cross sections are needed for the supply of such materials.
Another example of application are processes in the field of reactive extrusion. For their successful execution an extension of the dwell time or an enlargement of the reaction surface or of the volume are required.
Like all other components of the modular ENTEX system, several ERMOs can be used in series or at separate positions of a production line – in addition, there are various supplementary options such as side feeder, injection and degassing openings.
For more information about ERMO please contact our service department or you are welcome to use the following contact form.
One Planetary roller extruder replaces 28 twin screws
with respect to the gaps between the kneading elements!
Enclosed find our PDF with more information.