In a four-person household, the washing machine is in operation about one and a half hours a day. On average, it washes, rinses and spins about 250 times a year, cleaning some 1,000 kilograms of dirty laundry, an amount that is increasing all the time. Its components, particularly the rubber hose systems and rubber gaskets, are subjected to greater chemical and mechanical stresses than just about any other household appliance. Moisture, detergents and cleaning agents, particularly alkaline agents, as well as high water temperatures must not have an adverse effect on the material. Due to the long service life of the washing machine, all polymer parts, especially rubber parts, need to have a service life of at least 10 years, which means excellent resistance to aging.Read more
The following directory lists custom services suppliers. The first part lists custom rubber mixers along with plant locations, equipment, mixing capabilities and whether technical service and/or recipe development are offered. A directory of companies that offer various custom services to the rubber industry follows.Read more
Austin Black 325 is a finely divided (below 325 mesh) powder produced from high carbon content, low volatility, sustainable bituminous coal. It has different properties compared to carbon black, including a lower specific gravity of 1.30 versus 1.80, a platy ground structure versus the reinforcing morphology of carbon black (figures 1 and 2), and a lower surface area in comparison to carbon black. Beyond its carbon composition, it is more similar in structure to platy fillers like clay and talc. The specific gravity comparison to other platy minerals (1.30 versus 2.50) provides economical and efficiency gains.Read more
NR is usually masticated for viscosity reduction through breakdown of the long molecular chains to facilitate subsequent processing steps (e.g., extrusion and calendering) and improve rheological properties, such as die swell, shrinkage and building tack.Read more
Ethylene propylene diene polymers (EPDM) are the most widely used rubbers in the range of available synthetic rubbers for non-tire applications. Due to the unsaturated backbone, EPDM can be employed in various applications in which characteristics such as resistance to ozone, heat and moisture, flexibility at low temperatures, a wide range of tensile strength and hardness levels, and excellent electrical insulating properties are importantRead more
In order to investigate all the effects of the processing parameters on the mixing properties without having to do a number of experiments, the statistical tool, called response surface methodology (RSM), has been used. This technique has the capability to evaluate all the effects of the parameters on the responses, which include linear, non-linear and interaction effects. Simultaneous Effects of Mixing Parameters on Internal Mixing of Rubber and Carbon Black Using Response Surface MethodologyRead more
The disposal of scrap rubber has been a concern since its vulcanization with sulfur and heat was accidentally discovered by Charles Goodyear in 1839. In addition to the scrap generated in production, there is the question of discarded rubber goods that have outlived their usefulness for their original function. Traditionally, this waste had ended up in landfills, contributing to the growing problem of overcrowding. Scrap tires are a well-publicized category of scrap rubber, as each year automobiles produce 246 million waste tires in the United States alone.Read more
Processing promoters (additives) improve the efficiency of compound mixing and processing, and facilitate complex manufacturing processes.
Processing additives influence the whole production process, from compounding to the finishing of the rubber article.
by Michael F. Drenski, Wayne F. Reed, Piotr Kozminski, Terry Hogan, Bridgestone Research Americas The production of SBR via anionicRead more
by Hans P. Hurlimann, ETH Zurich Why is there so little discussion these days on basic problems of rubber compounding?Read more