Method for manufacturing a patch equipped with a radiofrequency transponder
A process for manufacturing a rubber patch comprising a radiofrequency transponder, the patch having a first layer and a second layer, the method comprising moulding and vulcanizing a first layer, the exterior surface of which comprises a cavity able to receive a radiofrequency transponder, placing a transponder in the cavity, and then placing and vulcanizing a second layer in order to embed the transponder between the two layers.
1. A process for manufacturing a rubber patch comprising a radiofrequency transponder, the patch having a first layer and a second layer, comprising the following steps:
choosing a first mould, having an impression which has a geometry adapted to a geometry of the first layer of the patch and that defines on a surface of the first layer a cavity able to receive the transponder;
placing a rubber material forming the first layer of the patch in the impression of the first mould;
raising the temperature of the first mould for a time suitable to vulcanize the rubber material to obtain a vulcanized first layer with a cavity, able to receive a radiofrequency transponder, on its exterior surface;
choosing a second mould, having an impression which has a geometry adapted to a geometry of the patch;
placing the vulcanized first layer in the impression of the second mould;
inserting the radiofrequency transponder into the cavity of the surface of the vulcanized first layer;
placing a rubber material forming the second layer of the patch into the impression of the second mould over the radiofrequency transponder;
raising the temperature of the second mould for a time suitable to at least partially vulcanize the rubber material to obtain an at least partially vulcanized rubber second layer; and
removing the rubber patch, comprising the radiofrequency transponder embedded between the first and second layers, from the second mould,
wherein the impression of the first mould comprises at least one rib in order to create, in the surface of the first layer between the cavity able to receive a radiofrequency transponder and an exterior end of the surface, a groove.
2. The process according to claim 1 , wherein the impression of the first mould comprises four ribs in order to create, in the surface of the first layer between the cavity able to receive a radiofrequency transponder and the exterior end of the surface, four grooves extending the length and width of the surface of the first layer.
3. The process according to claim 1 , wherein the rubber material from which the first layer and the rubber material from which the second layer is made is a rubber blend based on unsaturated or saturated diene elastomers.
4. The process according to claim 3 , wherein the rubber material from which the first layer is made is a rubber blend based on butyl rubber.
5. The process according to claim 3 , wherein the rubber material from which the second layer is made is based on unsaturated diene elastomer.
6. The process according to claim 1 , wherein the rubber material of the first and second layers is based on an ethylene propylene diene monomer rubber.
7. The process according to claim 1 , wherein, after the vulcanized first layer has been placed in the impression of the second mould and before the rubber material forming the second layer is placed in the second mould, the surface of the vulcanized first layer is prepared.
8. The process according to claim 7 , wherein the surface of the vulcanized first layer is prepared by applying a film of solvent, by a plasma treatment, or by removing an interlayer placed on the surface of the first layer before the vulcanization thereof.
9. The process according to claim 1 , wherein, after the vulcanized first layer has been obtained, the vulcanized first layer is placed in the impression of the second mould and the rubber material forming the second layer is placed in second mould within a time less than one hour.
10. The process according to claim 1 , wherein the rubber material forming the first layer and the rubber material forming the second layer are formed by injection moulding.
11. The process according to claim 1 , wherein the rubber material forming the first layer and the rubber material forming the second layer are formed by over moulding.
12. The process according to claim 1 further comprising the steps of:
demoulding the vulcanized patch; and thereafter
adding a layer of non-vulcanized bonding rubber to the exterior surface of the second layer.
13. The process according to claim 1 further comprising the steps of:
demoulding the vulcanized patch; and thereafter
adding an adhesive layer based on silanized polyether to the exterior surface of the second layer.