Technische Produkte

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Technische Produkte

Friction Effects in the Contact Area of Sliding Rubber: a Generalized Schallamach Model

Based on the original Schallamach-model we present a generalized theory that predicts the buckling effects and the tangential stress gradient as the driving force for the waves of detachement. In contrast to the original Schallamach-model the generalized theory considers a non-Coulombian rubber friction coefficient μ(p) that depends on the local normal pressure. Furthermore, numerical solutions […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Influence of Compounding Materials on Tire Durability

This paper illustrates, in a general way, how compounding raw materials used in several non-tread tire components can affect their properties that in turn will influence tire durability. Examples are given of the effect of polymers, antidegradants and curing agents on compound properties including weather resistance, impermeability, fatigue resistance, hysteresis and adhesion. Included is data […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

High Temperature Curing of Passenger Tires by Using 1,3 Bis-(Citraconimidomethyl) Benzene

1,3 bis(citraconimidomethyl)benzene, an extremely effective antireversion agent, maintains the physical properties of vulcanizates that are overcured or cured at high temperatures. This paper summarizes laboratory results obtained in a typical passenger tread compound that demonstrate the feasibility of improving productivity by increasing cure temperatures. Hochtemperaturvulkanisation von PKW-Reifen unter Verwendung von 1,3-Bis- (Citraconimidmethyl)benzolDas oben genannte Agens […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Calorimetric and X-Ray Investigations of Polyamide-6 and Blends with a Polyethyl Acrylate Elastomer – Part III: Crystallization-, Melting- and B

In PA-6/PEA-blends the crystallization potential of PA-6 is reduced by reactions leading to either longer or crosslinked chains. Depending on the mechanical pre-treatment, blends with less than 40 wt-% PA-6 crystallize in 2 or 3 steps. For the system PA-6/PEA (W(PA-6) = 0.2) it has been shown that a multi-step crystallization does only occur if […] mehr...

28.April 2003 - Neues aus der Forschung

Peripherietechnik

Recent Developments in Extrusion of Tire Components1

In recent years there were no revolutionary inventions in the field of rubber compound plastification and profile shaping (such as multi component heads, roller head and single roll roller die units or pin extruders), however, there are many most interesting developments and improvements of almost all line components, resulting in a better handling and use […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Rubber-Metal Bonding as an Electrochemical Process

Rubber-brass bonding during vulcanization has already been previously discussed as a result of ionic reaction mechanisms. If electrically charged species (e. g. metal and sulfide ions) are formed, the bonding process should be influenced by an electric field. An experimental set-up for the application of a voltage during vulcanization and the preparation of test specimens […] mehr...

28.April 2003 - Neues aus der Forschung

Peripherietechnik

Abschätzung und Auslegung von Extrudern für Reifenprofile

Die genaue Berechnung der Extrudergrößen in einer Anlage zur Extrusion von Profilen für die Reifenherstellung verlangt genaue Kenntnisse nicht nur über die geplanten Kapazitäten und Dimensionen, sondern auch über die Zusammensetzungen und die Verarbeitungseigenschaften der verwendeten Kautschukmischungen. Da oft nur unvollständige Informationen vorliegen und aus Kosten- oder anderen Gründen auch nicht immer Versuche mit dem […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Tire Compound Materials Interactions

Considering a modern tire compound, it has been shown that the materials interactions play a very significant role. This paper also indicates that a good dispersion may well solve the problem of the so-called magic triangle. Indeed a good dispersion improves all fundamental tire properties.. To achieve a good dispersion obviously both the carbon black […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Reinforcement of Silica-Filled EPM Compounds using Vinylsilanes

This paper demonstrates that the addition even of small amounts of vinylsilane strongly enhances the reinforcement of silica-filled rubber compounds. With regard to coupling efficiency, processibility, and health concerns the vinyltriethoxysilane VP Si 225 as well as the oligomerized vinylsilane Dynasylan 6498 are best suited for the rubber industry. Furthermore, the influence of the amount […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Lebensdauerprüfung von Elastomerbauteilen

Gummifedern für Schienenfahrzeug-Drehgestelle stellen komfort- und laufdynamisch relevante Bauteile mit besonderen Zuverlässigkeitsanforderungen dar. Ein Lebensdauernachweis für Neuentwicklungen kann im allgemeinen nur auf Basis ein- oder multiaxialer Bauteilprüfungen erbracht werden. Hierbei gilt es, die realen Bauteilbelastungen des Fahrbetriebes in möglichst repräsentativer Form zu erfassen und anschließend in Prüfsignale für den Laborversuch zu transformieren. Neben dem komplexen […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Effects of Different Ingredients and Cure Parameters on Physical Properties of a Tyre Tread Compound

The effect of polymer blends, viz. NR/BR, NR/SBR and SBR/BR, and cure parameters such as cure time and cure temperature on the hardness of a tyre tread compound has been investigated. Along with the hardness, other physical properties have also been measured with variation of the above blend compositions and cure parameters. The empirical relationships […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Improved Tread Compound Wet/Winter Traction Using Brominated Isobutylene-co-para-Methylstyrene1

Use of brominated isobutylene-co-para-methylstyrene (BIMS) improves the laboratory dynamic properties predictive of wet and winter traction of formulations modeling all-season, winter and high-traction passenger tire treads. Blends of BIMS with cis-polybutadiene, natural rubber, and solution-polymerized styrene-butadiene rubbers having varying microstructures were studied in silica-filled compounds. Selective substitution of the BIMS elastomer was made in order […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Stabilization of Dynamic Properties Following Ageing

Tire operating temperature is of vital concern to tire engineers because it relates both service life and power loss in a tire. Operating temperature therefore is a limiting factor in the choice of construction materials for truck tires, which run at much higher temperatures than do automotive tires. The power loss as well as hysteresis […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Berührungslose magnetoelastische Sensoren

Es wird ein fernauslesbarer Sensor für mechanische Größen vorgestellt, der auf einer Kombination des magnetoelastischen und des Magnetoimpedanz-Effekts basiert und in der Folge eine Änderung der Radarreflektivität als Funktion der Dehnung des Sensorelements aufweist. Das entsprechende Messsystem und die Strategien der Signalverarbeitung werden am Beispiel eines Reifensensors diskutiert. Mit diesem System ist es z. Z. […] mehr...

28.April 2003 - Neues aus der Forschung

Kautschuke

Improving the Heat Resistance of Hydrogenated Nitrile Rubber Compounds – Part 1: Aging mechanisms for high saturation rubber compounds

Aging mechanisms for hydrogenated nitrile rubber (HNBR) and ethylene propylene rubber (EPM) compounds under severe oxidative conditions are discussed. Based on results from compounding studies and analytical experiments, the importance of balancing the molecular parameters affecting the HNBR microstructure for optimum long-term performance is highlighted. Verbesserung der Hitzebeständigkeit von hydriertem NitrilkautschukAlterungsmechanismen für Mischungen basierend auf […] mehr...

28.April 2003 - Neues aus der Forschung

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