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FUSION

Screw Extruder with Hot Air Heating

Leister Fusion Plastic Welding Extruder with Hot Air Heating
Principle of Screw Extruders with Hot Air Heating

With this version, a thread is used to pull in the welding rod on the screw1. In the process, it passes a feed-in sleeve2 preventing the rod from twisting. Once inserted, the knife 3 cuts the rod. The screw spiral moves the rod forward. Heat penetrates the extrusion unit from the outside, starting the plasticizing process and helping it continue during operation. The external heat is generated by the hot gas appliance 4 in the form of hot air which then flows around the extrusion unit in the preheating chamber 5. Frictional heat is also generated by the compression and friction. This causes the weld filler metal to be plasticized and to be mixed into a homogeneous mass. The extrudate then exits the nozzle6.

This technology gives the FUSION extruder a simple and robust design.

WELDPLAST

Screw Extruder with Spiral Heating

Leister Fusion Plastic Welding Extruder with Spiral Heating
Principle of Screw Extruders with Spiral Heating

With this version, a thread is once again used to pull in the welding rod on the screw1. In the process, it also passes the feed-in sleeve2 preventing the rod from twisting. Once inserted, the knife 3 cuts the rod. This is drawn forward by the screw spiral, compressed and heated by means of friction. The spiral heating 4 generates the external heat necessary for the process. The spiral heating winds around the entire extruder barrel5 and regulates the temperature of the melting range with exceptional precision. The temperature probe 6 built into the cylinder tube measures the mass temperature. This sends the information to the electronics 7, which in turn control the entire plasticization process as a closed circuit. The extrudate then exits the nozzle8 evenly and at a precisely controlled temperature. The preheated air temperature is also measured by a probe9 and regulated by the electronics7.

The process-related temperatures are regulated by this highly technical structure. This facilitates consistent and safe welding.

With these technologies and different dimensions, Leister provides a comprehensive range capable of covering different needs. The hand extruders are used in traditional apparatus engineering, landfill construction, plastic repairs and numerous other sectors. They are highly valued wherever quality and performance are required.

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