FR2567808A1 - PROCESS FOR PRODUCING A ROLL - Google Patents

Abstract

THIS PROCESS INCLUDES THE STEPS CONSISTING OF: A. TAKING A SHAFT 2 TO BE COVERED WITH A RUBBER COATING, Said SHAFT 2 BEING COVERED WITH A GLUE COATING 4; B. PLACE A FIRST RUBBER COATING 6, WITH LOWER HARDNESS, ON THE CENTRAL PART OF SHAFT 2; C. PLACE A SECOND RUBBER COATING 8 AND A THIRD RUBBER COATING 10, WITH GREATER HARDNESS, ON THE TWO END REGIONS OF SHAFT 2; D. APPLY PRESSURE TO BOTH END 8 RUBBER COATINGS; 10 TO REQUIRE THE THREE RUBBER COATINGS 6; 8; 10 GET INTO INTIMATE CONTACT, AND E. EXPOSE THE RUBBER-COATED SHAFT 2 TO HEAT TO VULCANIZE THE SECOND AND THIRD RUBBER COATINGS 8; 10 ON THE ENDS OF THE FIRST RUBBER COATING 6 AND BIND THE COMPOSITE RUBBER COATING BY ADHESIVE TO THE SHAFT 2.

Description

PROCESS FOR PRODUCING A ROLL

  The present invention relates to a manufacturing process

  cation of a roll coated with rubber.

  U.S. Patent No. 3,666,335 discloses a pad having a central rubber coating and two ends of greater hardness. These ends are either

  fixed by pressure, glued on a support sleeve.

  U.S. Patent No. 1,919,375 discloses a rubber bearing structure having an inner hard rubber composition and a rubber composition

soft outside.

  U.S. Patent No. 3,118,710 discloses an elastic seal having an inner rubber member and

  two outer plastic elements.

  The present invention relates to a method of manufacturing a rubber-coated roll consisting of

  central rubber coating on one shaft and two facing-

  external rubber on each end of the shaft.

  The central rubber coating has a hardness at

  durometer lower than that of the two end coatings.

  Pressure is applied to the three rubber coatings.

  This forces the three coatings to come into intimate contact and the coatings are then vulcanized together as a single structure, the rubber coating

  composite being at the same time bound to the tree by glue.

  The subject of the present invention is therefore a method for manufacturing a roll covered with rubber, characterized in that it comprises the steps of:

  (a) take a tree to be covered with a coating

  rubber shaft, said shaft being coated with an adhesive coating, (b) having a first rubber coating of durometer hardness on the central portion of the shaft, (c) providing a second coating of rubber and a third rubber coating with an upper durometer hardness, on both end regions of the shaft,

  (d) apply pressure to both rubber liners

  end rubber to force the three rubber liners into intimate contact, and (e) expose the rubber-coated shaft to heat

  to vulcanize the second and third rubber coatings

  Rub on the ends of the first rubber liner and bond the composite rubber liner with glue to the shaft.

  To better understand the purpose of the present invention,

  In the following drawing, a purely illustrative and nonlimiting embodiment will be described, an embodiment shown in the accompanying drawing, the single figure of which is a cross-sectional view of a shaft having the coating of

  composite rubber according to the present invention.

  The present invention relates to a method of manufacturing a rubber-coated roll, using the steps

  following. We first take a tree 2 to be re-

  covered with a rubber coating. First, the shaft is covered with a glue coating 4 which will eventually bind the rubber coating to the shaft. The glue is a thermally activated glue and is known in the art, a number of

  different adhesives are available for bonding the rubber

rubber to metal.

  The first rubber material 6 is disposed on the central region of the shaft 2 and this material has a durometer hardness of 65. An end cap 5 is placed on

  each end of the shaft and is bolted to it by bolts 3.

  It will cover almost the entire end of the material of

  rubber 6, except its surface 7.

  The second and third rubber coatings are then placed on the shaft at each end of the rubber coating 6. These rubber coatings 8 and 10 have a

  durometer hardness of 85, and, therefore, are generally

  of a hardness greater than that of the rubber coating.

  6. A pressure is applied in the direction of the arrow 12 by the end caps 11 to hold the three rubber liners in close contact, in particular

  their ends, at the level of the surface 7.

  The complete rubber-coated shaft is wrapped in a nylon strip 14 to apply pressure to the rubber coverings 6, 8 and 10. While the pressure is maintained, the entire structure is exposed to heat to vulcanize the second and third coatings on the part

  end 7 of the first rubber coating. Vulva

  This is done by heating the unit to 151 C (305 F)

  for 1 hour 3/4. At the same time, the thermally activated glue

  4 will bind the resulting composite rubber structure to the shaft. The composite rubber structure is, in fact, constituted by the two hard end elements 8 and 10 and

  the soft rubber core 6, vulcanized together.

  Rubber coatings 6, 8 and 10 'are com-

  the only determining point with regard to their composition being the fact that they present

  a different hardness and that they are able to be vulcanized.

  Typical rubber compounds that may be used include those disclosed in the US Patent

of America No. 3,505,267.

Claims (1)

CLAIM -   Process for producing a roll covered with rubber   characterized in that it comprises the steps of to:   (a) take a tree (2) -being to be covered with a   rubber garment, said shaft (2) being covered with an adhesive coating (4), (.b) having a first rubber coating <6), of a durometer hardness, on the central part of the shaft (2), (c) providing a second rubber coating (8) and a third rubber coating (10) of durometer hardness on both end regions of the shaft (2),   (d) apply pressure to both rubber liners   end rubber (8; 10) to cause the three rubber liners (6; 8; 10) to come into intimate contact; and (e) to expose the rubber-coated shaft (2) to heat to vulcanize the second and third rubber coatings (8; 10) on the ends of the first rubber coating (6) and bonding the composite rubber coating by glue to the shaft (2).