Compositions – Fluent dielectric – N-containing
Patent
1993-09-21
1995-11-21
Raymond, Richard L.
Compositions
Fluent dielectric
N-containing
252153, 134 38, C11D 142, C11D 120
Patent
active
054684226
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/IT 92/00011 filed Feb. 4, 1992.
The present invention relates to a new composition for use in washing and cleansing vulcanization molds for the manufacture of tires or other rubber items, characterized by excellent efficiency and complete absence of mold corrosion. In greater detail it refers to a composition for cleansing the vulcanization molds in the manufacture of tires comprising: surface-active agent mixture,
It is known that three main parts can be distinguished in a tire, that is a tread, a carcass and a bead which is the tire portion ensuring its fastening to the rim. Taken as a whole, a tire can be considered as an assembly of materials of very high elasticity (best known as "mixtures") the base constituents of which are natural or synthetic rubbers and materials of very weak deformability usually consisting of cables, wires or sheets.
The mixture forming the tire tread must above all ensure a great strength to wear and an unusual and extraordinary grip to the road. As above said, generally a mixture is made up of (a) natural or synthetic rubbers, (b) reinforcing fillers greatly increasing the mechanical strength of the tires, above all ultimate strength and strength to wear, and (c) vulcanizing agents. The mixture preparation involves mixing and bonding operations carried out by means of inner mixers the elements of which are two helical blade cylinders, the blades rotating in opposite directions in a closed casing. These operations aim at increasing the rubber plasticity. In addition mixtures have the function of introducing other particular substances such as plasticizers, fillers, vulcanizing agents, etc. into the rubber.
The tire is then made by employing ply layers and section members made of mixtures according to a predetermined order involving position displacements carried out after careful evaluation. This operation is performed on cylindrical horizontally-disposed rubber drums. In the case of radial tires, the first operation consists in laying down a mixture sheet during one or two revolutions of the drum, which sheet will constitute the inner part of the finished tire. Then the ply layers that will form the carcass and the various section members are placed thereon, said section members being located at the end of a sleeve to which the beads are fitted.
Finally the so-called "tucking-in" takes place which consists in folding in around the beads the edges of the sleeve already arranged on the drum. The tire manufacture goes on with the laying of the section members designed to become the tire sidewalls. At this point the tire appears as a cylindrical sleeve that must become of toroidal form. Then compressed air is sent into the drum on which the tire is located and on this torus the belt layers and the section member that will become the tread are subsequently disposed in succession. By reducing pressure within the working sleeve, said sleeve will resume its starting configuration.
By vulcanization it is normally meant the operation by which mixtures are passed from the plastic state to the elastic state. To this end the tire is introduced into a mold having the tread patterns and the various inscriptions to be put on the tire reproduced in a raised or cut in condition. Disposed within the torus constituting the casing is a rubber diaphragm into which hot water under pressure is generally circulated once the matrix has been closed onto the tire. This fluid forcibly pushes the mixture against the matrix walls, while steam is flowing at the outside of the matrix. The hot water under pressure and steam bring to the tire all heat necessary to vulcanization. Temperature and time depend on the tire thickness and generally a temperature of 130.degree. C. to 170.degree. C. is applied for a period ranging from 30 minutes to some hours.
While vulcanization molds for big tires are still made of steel, currently tire molds for motorcars have been replaced by molds made of alluminium or aluminium alloys and generally consist of two side panels or walls and approxim
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Derwent's Abstract, No. 90-222 543/29, SU 15 126 901, publ. week 9029, Mosc Burevestruk (Oct. 7, 1989).
Ferroni Gianfranco
Khouzam Cesare
Lambkin Deborah
Raymond Richard L.
Silvani Antincedi
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