Technische Produkte

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Technische Produkte

Elastomers in Hoses for Air-Conditioning Systems

This paper discusses the development of rubber compounds for air-conditioning hoses designed to meet the stringent demands of the automotive industry. The phasing out of chlorofluorocarbons (CFCs) as automotive refrigerants and the introduction of new refrigerant fluids requires a new approach to compounding. The paper focuses on halobutyl formulations for an inner tube based on […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Verankerte Dichtung für Stahlbetontubings

Die Tubingdichtung ist beim einschaligen Tunnelbau nach dem Bauverfahren des maschinellen Tunnelvortriebes das Bauelement, welches die Dichtigkeit des Tunnels gegen Wasser gewährleistet. Im Zuge eines gemeinsamen von der HOCHTIEF, der Phoenix AG und der Herrenknecht AG durchgeführten Forschungsvorhabens wurde eine Dichtungs- und Schalungstechnik entwickelt, die es ermöglicht, unmittelbar während der Herstellung des Stahlbetontübbings die Dichtung […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Material Modelling in Cord-Rubber Structures

A model of linear, orthotropic cord-rubber composite material is defined in the paper, which enables to make an effective static analysis of complex pneumatic structures. A procedure in which physical non-linearity and incompressibility of rubber-like materials are taken into account is introduced into the existing numerical tool, so far working as a geometrically nonlinear code. […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Butyl Reclaim in Innerliner Applications

Reclaimed butyl rubber is an important compounding ingredient that is widely used in the tire industry. For innerliner applications halobutyl compounds are used for which partial replacement with butyl reclaim is possible. An increasing amount of butyl reclaim results in a lower air permeability enabling the manufacturer to reduce the thickness of the innerliner. Aging […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Measurement and Molecular Modeling of Rolling Resistance in Tire Treads

Rolling resistance is a key tire property considered in the design and manufacturing of tires. Usually rolling resistance is measured by an expensive quantitative tire test using a prototype final product. In order to speed up the development, efforts have been made to predict rolling resistance using samples rather than prototype tires. One such attempt […] mehr...

28.April 2003 - Neues aus der Forschung

Recycling

Interphase Grafting of Reclaimed Rubber Powder

In material-sensitive recycling of crushed reclaimed rubber materials, which is achieved by admixing the recycled rubber with new rubber matrices, a drop is noted in the mechanical value level of elastomers. This drop is due to deficient grafting of the recycled rubber with the fresh rubber matrix. To improve grafting quality, the particle surfaces are […] mehr...

28.April 2003 - Neues aus der Forschung

Institute & Verbände

Determining Energy of Rubber Cylinders Using FEA

The objective of this study was to calculate strain energy for a rubber cylinder using finite element analysis (FEA) and compare using analytical equations for simple extension, bonded tension, and bonded compression. Constitutive laws were derived for simple extension including linear, large deformation, and hyperelastic material models. The strain energy or work done on the […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

High Temperature Creep Performance of Nylon 6.6 Tyre Cords

A high temperature creep measuring apparatus capable of operating at different stress levels over a wide range of temperatures and humidities was built. The apparatus was used to investigate creep behaviour of nylon6.6 tyre cords, under isothermal and non-isothermal (cyclic) operating modes. Under both operating conditions, cords exhibited instantaneous extensions on loading followed by steady […] mehr...

28.April 2003 - Neues aus der Forschung

Recycling

Standards for Rubber Granulates and Powders

Rubber powders (or granulates) from ground rubber scrap materials are used in many applications in different fields. These applications ask for different properties of the rubber powders. In this paper a number of suggestions to classify powders are given. A reference is being made toward ASTM D5603, that classifies powders with respect to feed stock […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Analysis and Comparison of Joints between Rubber and Metal and between Rubber and Rubber

The paper deals with studies of optimisation of joining a rubber sleeve of a packer to its cap. The current technology of manufacturing a packer from a rubber sleeve and two aluminium caps and reinforcing the joint by a Kevlar strip has been time-consuming and costly. The investigations were conducted to establish the influence of […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Kieselsäuren für den Grünen Reifen – Prozesse, Produkte, Eigenschaften

Die gleichzeitige Verbesserung sich scheinbar widersprechender Reifeneigenschaften wie z. B. Rollwiderstand, Nassrutschfestigkeit, Langlebigkeit und Wintertauglichkeit ist eine wichtige Forderung der Automobilindustrie vor allem in der Erstausrüstung von PKW-Reifen. Mit der Einführung des Kieselsäure/Silan-Systems in Kombination mit speziellen Lösungspolymeren in PKW-Laufflächen zu Beginn der neunziger Jahre konnten diese Forderungen erfüllt werden. Dabei hat sich herausgestellt, dass […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Microwave Dielectric Properties of Rubber Compounds undergoing Vulcanisation

The application of microwave measurements to the characterisation of rubber compounds vulcanisation is considered. The change of mechanical and microwave (20 GHz) dielectric parameters during vulcanisation was measured for three kinds of compounds: pure natural rubber, a compound with vulcanisation system and the corresponding compound containing carbon black. Changes of microwave dielectric permittivity and loss, […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Stand und Perspektiven des Gummirecyclings

Nicht nur aus ökologischen und ökonomischen Überlegungen, sondern auch durch aktuelle Entwicklungen in der Umweltgesetzgebung ist das Recycling von Gummi wieder in den Blickpunkt der Gummi-verarbeitenden Industrie gerückt. Neben den gesetzlichen Grundlagen beleuchtet dieser Artikel die Herausforderungen beim Recycling von Gummi und beim Wiedereinsatz von Altgummi in originären bzw. neuen Anwendungen. An vielen Beispielen werden […] mehr...

19.März 2003 - Neues aus der Forschung

Technische Produkte

On the Depending of Tire Performance and the Degree of Mixing

Tire performance is not only related to its architecture and compound formulations but more so on the way the compound ingredients are mixed together and its process history downstream. A design of experiment procedure was used to investigate the relationship between mixing cycle and the viscoelastic properties of silica tread compound. Due to the large […] mehr...

19.März 2003 - Neues aus der Forschung

Technische Produkte

Use of Surface Grafted Ground Tyre Rubber (GTR) in PA-6, PBT and PUR

Ground Tyre Rubber (GTR) particles have been treated with glycidyl methacrylate (GMA) and methacrylic acid (MAA) using a proprietary photoinitiated surface grafting process. The grafted GTR (GMA-g-GTR and MAA-g-GTR, respectively) was incorporated in various polar thermoplastics (PA-6, PBT) and elastomers (PUR) in order to assess the effectiveness of the grafting process. It was concluded that […] mehr...

14.Februar 2003 - Neues aus der Forschung

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