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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Screw: Problem Solving01:21

Screw: Problem Solving

In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.

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Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Development of Alternative Screw Concepts for Rubber Extrusion Based on Simulative and Experimental Methods.

Leon Schmidt1, Volker Schöppner1

  • 1Kunststofftechnik Paderborn, Paderborn University, 33098 Paderborn, Germany.

Polymers
|May 13, 2026
PubMed
Summary

This study explores pinless screw designs as alternatives to traditional pin-type rubber extruders. These novel designs offer comparable material homogeneity and higher throughputs, improving cost-effectiveness in rubber extrusion.

Keywords:
CFDalternative screwsextrusionpinless rubber extrusionrubberscrew designsimulation

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Area of Science:

  • Polymer Engineering
  • Materials Science
  • Manufacturing Processes

Background:

  • Traditional pin-type rubber extruders face limitations in efficiency and design flexibility.
  • Advancements in screw design offer potential for improved rubber extrusion processes.

Purpose of the Study:

  • To investigate alternative screw concepts for rubber extrusion, specifically those with circumferential and axial flight offsets.
  • To evaluate the suitability and performance of pinless extruder designs compared to conventional pin-type extruders.

Main Methods:

  • Utilized simulative (computational modeling) and experimental methods to analyze alternative screw concepts.
  • Focused on styrene-butadiene rubber (SBR) mixtures to assess simulation accuracy and material behavior.

Main Results:

  • Simulations demonstrated good functionality for SBR mixtures, with noted limitations in thermal property prediction.
  • Pinless designs achieved comparable material and thermal homogeneity to pin-type extruders.
  • Achieved up to 10% higher throughputs with the investigated pinless designs.

Conclusions:

  • Pinless screw concepts are a viable and effective alternative to pin-type extruders for rubber extrusion.
  • These alternative designs enhance cost-effectiveness through increased throughput and efficient design via simulation.
  • Further simulation refinement, particularly for thermal properties, is recommended.