Projectile injection technology (PIT) is a new approach for the production of hollow rubber parts that is already used in thermoplastics processing. However, there have been very few investigations on the PIT processing behaviour of rubber compounds. The flow and curing behaviours are mainly responsible for the surface quality achievable and residual wall thickness.

Wittmann stellt in Düsseldorf eine neue Baugröße der Temperiergeräte Serie Tempro basic vor. Welche das ist.

Das Mehrkomponentenspritzgießen von Flüssigsilikonkautschuken (LSR) mit Thermoplasten, wie PBT oder Polyamid ist Stand der Technik und wird bei vielen Bauteilen in der Automobilindustrie und im Bereich der Sanitärtechnik im Herstellungsprozess angewendet. Standardthermoplaste, wie z. B. Acrylnitril-Butadien-Styrol (ABS) lassen sich wegen ihrer niedrigen Erweichungstemperatur bisher nicht mit Silikonkautschuken im Spritzgießverfahren verbinden.

The current research aims to improve the accuracy of results obtained from a pin-on-disc tribometer by using stepper motors and linear actuators. Additionally, the research focuses on enhancing the tribological properties of PMMA by reinforcing it with 0.1, 0.2 and 0.3 wt% SWCNT or MWCNT. The researchers prepared cylindrical-shaped nanocomposite samples and subjected them to friction and wear tests using a pin-on-disc tribometer with stainless steel disks as counterparts.

Rubber is used in numerous applications and due to this, different recipes are needed. For each recipe used, an individual mixing instruction has to be developed. The development of them is often based on personal knowledge. In order to generate mixing instructions in the future, the mixing process was investigated and modeled. Therefore, mixing tests were carried out using different process parameters. 

Die Industrie befindet sich in vielerlei Hinsicht in einer Transformation. Nachhaltigkeit ist das Gebot der Stunde, auch bei den eingesetzten Rohstoffen. Hanfschäben sind eine Alternative. Nachfolgend erfahren Sie weshalb und wofür.

This publication describes the design and construction of a test rig for the additive manufacturing of liquid rubber-based filled and curable low viscous rubber compounds. In contrast to the previously presented AME-process [2] [3], in which conventional high viscous rubber compounds are processed in filament form via a twin-screw extruder in a modified FFF-process, the 3D-printing process of rubber compounds in this research project is realized via a dispenser unit for low-viscosity materials.

A compound of crosslinking polyolefin elastomer (POE)/ linear low-density polyethylene (LLDPE) blend, as a class of thermoplastic elastomer family, was prepared through a two-step silane grafting method (Sioplas process) using twin-screw extruder. The silane grafted compound was used as wire and cable coatings. 

The continuous ultrasonic devulcanization of 40 mesh ground tire rubber (GTR) powder was carried out using an ultrasonically assisted twin-screw extruder. The die pressure and ultrasonic power consumption were recorded during the process. 

In a previous paper, we have presented an alternative way to use the RPA (Rubber Process Analyzer) to measure both transient and steady shear viscosity [1]. The replacement of the grooved upper die by a “mirror” polished groove less die combined with programmable internal pressure offers a unique combination to study wall slip. It unambiguously showed that the wall slip ratio is decreasing while increasing shear stress/rate. It demonstrates as well that wall slip depends upon pressure.