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Fuel Economy

29 June 2006
Q: Why does The RINGTREAD® System provide superior fuel economy to conventional precure retreading? A: Lower rolling resistance, better fuel economy, reliability and longer mileage have always been important to Marangoni, that’s why these performance characteristics were designed into the unique RINGTREAD System and sets it apart from conventional retreads.

Q: Why does The RINGTREAD® System provide superior fuel economy to conventional precure retreading?


A: Lower rolling resistance, better fuel economy, reliability and longer mileage have always been important to Marangoni, that’s why these performance characteristics were designed into the unique RINGTREAD System and sets it apart from conventional retreads.

“Instead of making small, incremental changes to flat, spliced retreads, Marangoni completely departed from conventional precure retreading by inventing the RINGTREAD System. The result is more miles and better mileage.” Giuseppe Marangoni.


The RINGTREAD is designed round, not flat, and without a splice to fit the tire just as it should.
Not only did the RINGTREAD® System remove the technical problem of the splicing of treads, the system was ahead of it’s time in the introduction of contour shape tread technology. Typically RINGTREADS produce 20% more miles and 1 to 3% better fuel economy that conventional flat treads.

Unlike conventional precure retreading, where flat tread rubber is wrapped around a buffed tire casing and the tread ends are spliced together, the precured Marangoni RINGTREAD® is molded in one piece in circular molds so that it fits the contour of the round tire and eliminates the splice. This superior design eliminates the distortion and deformation of the rubber that occurs in conventional flat precure retreading. 


The result is a uniform, better-balanced retreaded tire, which yields longer lasting, even tread wear that requires less energy to roll and is cooler running. RINGTREAD® users report the lowest cost per mile of any retread product in the marketplace.
Marangoni achieves this lowest cost per mile benefit for its customers with their RINGTREAD® product for several reasons:


1. The contour shape of the tread matches the round shape of the tire; flat tread does not naturally fit the round casing. A traditional flat-tread design causes tread distortion when applied to a round casing therefore resulting in reduced mileage. RINGTREAD® allows maximum tread adhesion, preserves casing integrity, eliminates stress between tread and casing and runs much cooler. 

  2. A conventional flat tread requires splicing and the tread pattern is subject to being mismatched and distorted. This practice results in a heavy spot at the splice, creating an unbalanced condition and the possibility of a splice failure. Because RINGTREAD® is a continuous ring, it is uniform all around and this results in a uniform tread pattern and new tire appearance.  

The RINGTREAD® System delivers perfect fitment and even wear. With its no-splice installation and laser-guided centering on the casing, the end result is a truly balanced retread. Because of it’s improved performance RINGTREAD can deliver more miles with a shallower skid depth thus reducing further rolling resistance improving fuel economy and extending casing life.
Since first designing and developing the RINGTREAD® system, Marangoni has continually improved on the design and today the Marangoni RINGTREAD® outperforms competition due to it’s superior design and the quality control in the manufacturing process.

 

Q: How is RINGTREAD® manufacturing superior to conventional flat tread manufacturing?


   


A: RINGTREADS® are each made individually. – Unlike conventional flat treads that are made in, flat, multilevel, 33 ft. long presses, where control of curing time, temperature and pressure is compromised, RINGTREADS® are made individually in circular, segmented centripetal presses.


Uniform vulcanization in a centripetal press permits the molecular structure of the rubber compound to be stabilized in a stress-free configuration. It also allows for the tread to be cured under the exact time, temperature and pressure required for that particular tread design and allows for excellent control of all manufacturing parameters. Because of the RINGTREAD® System’s intrinsic design, manufacturing of the RINGTREAD® is optimized in material usage enabling the RINGTREAD® to be cured at a lower temperatures than conventional flat treads. 
Marangoni has made substantial investments in production techniques in recent years, allowing us to continually optimize the performance of our products. We believe these investments will allow Marangoni to further expand on its leadership position in the supply of materials and technologies to the global retreading industry. Two very important components in the overall manufacturing process are:
  1. Mixing standards – Marangoni has always maintained that consistent, high quality products depend on consistent ingredient dispersion. Maintaining very high mixing standards allows the ability to maintain the constant technological parameters of compounds between narrow tolerances, reducing variation and increasing the ability to develop the more complex compounds required today for ever increasing product demands. The only way to ensure these standards are met is to continually improve on world-class standards.
  2. After a long series of technical analyses and road tests, Marangoni Tread has implemented the large-scale introduction of a new family of compounds with a low oil content into its line of precured retreads. The new compounds are similar to those used to produce high-quality new tyres and are called ZERO OIL and LOW OIL.

The ZERO OIL and LOW OIL compounds offer many advantages over the traditional compounds used for retreading. Firstly, the dispersion of the reinforcing fillers inside the compound has been improved due to the absence of oils, significantly boosting all the performance characteristics. The main advantages that derive from this include better elasticity at low temperatures and reduced rolling resistance, as well as extended life of the rubber under stressing conditions. These compounds, moreover, allow the tyre to work at a lower temperature in conditions that involve considerable overheating, thus ensuring reduced fatigue on the casing and longer life.
The ZERO OIL and LOW OIL compounds also offer significant environmental advantages for both retreaders and end users, mainly due to the reduction in fuel consumption ensured by the tyres made using these compounds.
The ZERO OIL and LOW OIL compounds are used in many patterns in the range of RINGTREAD precured tread rings.

The resulting RINGTREAD® is designed and manufactured to specifications required for optimum performance expected by today’s demanding fleet managers.

Since it’s introduction 27 years ago, the RINGTREAD® System, the retreading process developed by Marangoni Tread, Verona, Italy using a splice-less tread ring cured in a circular mould, has been viewed in the retreading world as a major innovation that is still revolutionizing the industry today