RTMO-Erdspeicher wird Rotationsverfahren hergestellt


Even standard containers are special for us

Even standard containers can be special. At least when they are produced by Speidel.

Our tanks are produced by means of the so-called rotation process. Though it is slightly more laborious than the injection die moulding method often used by other manufacturers, the tank offers brilliant stability and impact properties due to the fact that it is one single piece that has been produced without tension.

In rotational moulding, powdery thermoplastic plastic is being melted to a homogeneous mass inside a slowly biaxially rotating metal or aluminum mould. Afterwards it is being cooled down again and then demoulded. Seamless hollow bodies are formed.

It is hardly surprising that many renown enterprises have their containers produced by Speidel. The overview of individual components shows how diversified the requirements in the field of technology developed for beverages, food and municipal services nowadays are.


Detailed description

  1. A weighed amount of plastic powder is filled into one half of a thin-walled, hollow metal or aluminum mold. This is mounted on a mold carrier (arm) of the actual processing machine. After filling the tool parts are connected with each other and closed.
  2. This tool is then brought to a bi-axial rotation and driven into a heating chamber (oven), in which the heat penetrates the mould wall from outside. This material inside the tool is gradually being heated up. Material particles melt on the hot mould wall and gradually form a layer.
  3. When all the material has melted and has evenly distributed, the machine clocks again and the tool is moved into a cooling station. With air, the temperature of the plastic is brought below the focal point. In the course of this the bi-axial rotation continues in order to avoid sagging of the melt.
  4. When the part is cooled sufficiently, the machine clocks again and the tool is brought into the so-called de-moulding and loading station, in which the tool is opened and the finished part is removed. After that, the tool is available for refilling and a new production cycle can start.