Abstract:
A method of treating a surface of an object comprising a rubber material and in particular a bladder for use in a process for making a vehicle tyre. The method comprises subjecting the surface to a gas at a low pressure at which the gas is susceptible of forming plasma, and causing the gas to form plasma. In order to obtain repellent properties of the surface of the rubber material fluorine gas such as tetrafluormethane or hexafluorethane is used. Preferably the treatment is performed until there is obtained a surface layer of the rubber material with properties modified by the treatment having an expected lifetime corresponding to the expected lifetime of the object.
Abstract:
A composition for balancing a rotary system, comprising an amount of a thixotropic balancing substance; characterized by an amount of hydrophobic particles distributed in said amount of said thixotropic balancing substance. A corresponding method and system.
Abstract:
Visco-elastic tyre balancing compositions comprising 1) 85 to 97% by weight of a glycol ether component comprising one or more ethylene/propylene glycol copolymer ethers of the general formula (I) or the general (II) or mixtures thereof R-O{[CH(CH 3 )CH 2 -O-] m [CH 2 -CH 2 -O-] n }H (I) R 1 -(O-{[CH(CH 3 )CH 2 -O-] m [CH 2 -CH 2 -O-] n }H) 2 (II) wherein R is hydrogen or an alkyl group of 2-8 carbon atoms; R 1 is an alkylene moiety of 2-8 carbon atoms in which the two substituents are not carried on the same carbon atom; m is the mole percentage of propylene glycol in the ethylene/propylene glycol copolymer moiety or moieties; and n is the mole percentage of ethylene glycol in the ethylene/propylene glycol copolymer moiety or moieties, wherein the ratio n: m is in the range from 35:65 to 80:20; each glycol copolymer compound having a number average molecular weight in the range of 2000-10000; and 2) 3 to 15% by weight of a fumed silica gel former; said balancing compositions being visco-elastic and having a Storage Modulus (G') between 1500 Pa and 5000 Pa at 22 o C, a Loss Modulus (G") smaller than the Storage Modulus up to a Cross Over Frequency of 10-40 Hz, and a Critical Yield Stress exceeding 2 Pa.
Abstract:
A method for reducing vibration in a rotary system (130,131,133) of an article processing machine, for example a washing machine, comprising balancing said rotary system, characterized by providing a substantially circular chamber having a fulcrum on an axis (132) of said rotary system and being partially filled with an amount of a thixotropic balancing substance. A system for reducing vibration in a rotary system of an article processing machine according to the method, and a corresponding balancing device, drum and drum wheel.