Tyres retreading

Development of Natural Rubber-Based Tmck Tyre Retreading Compounds," in M. E. Cain and Sifi Zubaidah bte Mohd Rashid, eds.. Proceedings of a UNIDO-sponsored Workshop, Kuala Eumpur, Malaysia, Malaysian Rubber Pioduceis Research Association, Heitfoid, U.K, 1992. 

A tyre retreading process in which new rubber is apphed as tread, on the tyre shoulders and on the tyre sidewalls. 

Tread-type rubber compound extruded in a variety of thicknesses and widths for use in tyre retreading. The standard section is in the shape of a regular trapezium, but variations are made to suit particular types of tyre and different makes of moulding equipment. 

Autoclaves can be specifically designed to accept moulds for tyre retreading. 

Wet skid and rolling resistance measurements on tyres retreaded with ENR-25 compounds (Table 12) show that these tread stocks have both superior wet grip to an oil extended styrene butadiene rubber (OESBR 1712), and lower rolling resistance than NR. " These results are sununarized in a Morton-Krol-type plot in Fig. 18. The tyre wear properties of ENR-25 black and black/silica (35 15) filled compounds are comparable with an NR tread stock. Improvements in wear can be obtained by blending with BR. 

Fig. 17. Rolling resistance ratings of steel radial tyres retreaded with various...

Figure 3.1 Off-the-road (OTR) tyre retreaded with compound containing 40% truck tyre 40 mesh crumb (a) tyre carcass being retreaded with the compound (b) moulded tyre ready for use and (c) tyre fitted onto the OTR vehicle. Reproduced with permission from Polymer Recyclers. 2014, Polymer Recyclers Ltd...

Tyre retreading compound (phr) Rubber crumb (phr) Price of retread compound ( /tonne) Saving (%)... 

The scale-up goal was achieved and the DevulCOi devulcanisation technology was successfully transferred to a number of sulfur-cured rubbers, including nitrile rubber, EPDM rubber and NR. In addition, the results of the evaluation of the performance of the DevulCOi rubber in tyre retread compounds were encouraging. A more extensive description of these two projects and the results of the manufacturing trials that were imdertaken during them, is provided in Chapter 5, Section 5.2.2.I. 

Figure 5.2 Passenger tyre retreaded with DevulC02 rubber in the mould prior to be being moulded a) and after moulding b). Reproduced with permission from the DevulCOi Research Project Consortium (Lead Parmer Smithers Rapra, Shawbury, UK), UK. 2012, DevulCOi...

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