LEWA supplies complete, ready to use solutions fitting your application. All combinations of the LEWA modules offer a completely automatic, clean, reliable and flexible extrusion.
The scope of services ranges from the supply of system assemblies through engineering and the start up of complex metering and mixing systems with custom system control, process display, logging of operational data, as well as interfaces to the process control system. The scope, including the process control, is done from one source and guarantees the optimal safety and functionality of the system.
Advantages of LEWA heated systems:
- Suitable for all additives
- Costs for compounding and master batches are
reduced or even eliminated
- Available in all control configurations
- Guaranteed reliable and flexible process by
the control/regulation of the mass flow
- No deterioration of the additive by local overheating
- No coagulation due to cold spots
Operator and service friendly complete system:
- Clever arrangement and good accessibility of the piping
- Hinged locking doors that open wide
- Easy removal of side parts (service)
- Fine filters operated alternately, which can also be switched over externally during operation
LEWA heating module
Insulated stainless steel cabinet with regulated air circulation and reliable sensor system; all equipment required for operation is accessible from the outside; electric heating, using steam or thermal fluids.
LEWA melting module
Stainless steel containers in various sizes with heating jacket, sensors and also optionally available with mixer; electric heating, using steam or thermal fluids.
LEWA control systems
Slave PLC, stand-alone PLC, microcontroller, relay technology, optional explosion proof.
|LEWA metering systems process the following additives, for example:
Extrusion is an important process in the plastics industry. Extruders must be heated, in order to melt the filled plastic granules or powder.
Some process related tasks make it necessary to cool the plasticized melt. Depending on the plastic used, other equipment is necessary, e.g., for pumping gases, which leave bubbles in the end product.
Normally other machines are required after the nozzle in the production of plastic products.
|They are subject to the following requirements:
|In addition, there are the requirements for all raw materials:
|Good environmental compatibility
|Lasting effect, e. g. for light stabilizers
|Low health risks
|No negative influences
In general, the quantity used is very low and includes less than 1% of the total recipe.
Source: Wikipedia, February 2012
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