Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1980-06-16
1982-11-30
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156137, 15624412, 156322, 156324, 156437, 156500, 156555, 425373, B32B 3108, B29H 700
Patent
active
043614566
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns the continuous manufacture of cable reinforced conveyor belts. In the process, rubber covering layers are placed onto a band of cables and exposed to a pressing and vulcanizing process.
STATE OF THE ART
Cable-reinforced conveyor belts are usually manufactured in two process steps. First, the raw belts are fabricated by covering the highly stressed cables with cover layers. The raw belts prepared in this manner are wound onto a storage roll. For the purpose of vulcanizing the conveyor belts, the raw belts are pressed and vulcanized in a second process step, either in a plate press in sections or continuously in a rotating installation. Vulcanizing in a rotating installation has the advantage of a fully continuous mode of operation (see the journal Gummi, Asbest, Kunststoffe 5/1978, pages 328 to 336).
Recently, specialists, in the art have been making attempts to develop advanced production facilities, wherein conveyor belts might be fabricated and vulcanized in a single cycle without the intermediate storage of raw belts. Installations of this type always operate with a platen press as the vulcanising press because rotating devices are not applicable for the reason that the steel wires under stress are pulling into the cover layer that is innermost in the radial direction, against the central drum of the press. The accurate center position of the reinforcing insert thus cannot be insured. This is also true for a further installation for the continuous manufacture of conveyor belts wherein initially in a large extruder a rubber hose with the wall thickness of the conveyor belt and a circumference corresponding to the width of the conveyor belt is produced, while the cables are being embedded simultaneously around the hose. Subsequently, the hose is cut between two cables, flattened out and fed continously, without interruption into a rotating installation (DE-OS No. 21 29 439). Here again, the steel wires, which are necessarily under stress, are pulling into the cover layer inside in the radial direction, by virtue of the resultant force.
It has therefore been proposed (DE-AS No. 19 31 972), to compensate this evasion of the steel wires by means of a suitable design of the cover layers. The cover layer that is innermost in the radial direction is to be made thicker than the outercover layer in the radial direction, so that the steel wires will be in an approximately correct position with respect to the surface of the conveyor belt. However, this proposal does not yield an accurate, defined position of the steel wires in the finished conveyor belt. Furthermore, the differential structure of the conveyor belt may be a disadvantage under the high operating stresses.
OBJECT
It is the object of the invention to provide a process for the uninterrupted fabrication and vulcanization of conveyor belts reinforced with steel wire, wherein a rotating vulcanizing press is used without the above-described disadvantages regarding the position of the steel wires.
DISCLOSURE OF THE INVENTION
The object is attained according to the invention in that the cover layer innermost in the radial direction is scorched prior to the placing thereon of the outer covering layer and the steel wires, and in that the raw belt is pressed and vulcanized after it has been placed in the rotating installation.
The cover layer placed on the center press drum of the rotating installation of the raw belt thus offers higher resistance to the steel wires under stress. Depending on the degree of scorching and the properties of the rubber mixture, the steel wires may remain in a defined position with respect to the surfaces of the belt.
The invention makes it possible to use rotating presses as the vulcanizing presses in an installation for the uninterrupted fabrication and vulcanizing of conveyor belts.
The invention also concerns an apparatus for the continuous manufacture of a conveyor belt with a continuous rotating installation. The apparatus is characterized by that an extruding-calendering arrange
REFERENCES:
patent: 1488343 (1924-03-01), Hoffman
patent: 2296372 (1942-09-01), Smith et al.
patent: 3556892 (1971-01-01), Hilliard, Jr.
patent: 3711348 (1973-01-01), Reschke
Becker, Electron Beam Irradiation of Tire Components, RPN Technical Notebook, Nov. 19, 1977, p. 16.
Ball Michael W.
Hermann Berstorff Maschinenbau GmbH
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