Retreading System

In this business area Marangoni develops day by day its extensive specialization in cold retreading with pre-cured rings. Today, in Europe, Marangoni is one of the main supplier of pre-cured material and equipment used in commercial tyre retreading. The real strength of this business unit, which covers all truck market needs, is the RINGTREAD SYSTEM: an exclusive cold retreading technology that utilises pre-cured tread rings produced in Marangoni Group facilities. The RINGTREAD SYSTEM offers highly automated retreading processes, guaranteeing enhanced productivity, high quality standards and outstanding technical performance. This business unit offers customers a wide range of products and services, from pre-cured rings and integrated retreading systems to technical know-how, sales training, plus marketing and after-sales support. The world is the reference market for this business unit which operates production plants in Italy, Germany, the United States and Brazil.


Q: Why is The RINGTREAD® System superior to conventional pre-cure retreading?

A: Unlike conventional pre-cure retreading where flat tread rubber is wrapped around a buffed tire casing and the tread ends are spliced together, the pre-cured 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 when conventional flat tread is wrapped around the round circumference of the tire. The result is a uniform, better-balanced retreaded tire, which yields longer lasting, even tread wear. 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: 

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.

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 requires no cutting or splicing, there is, therefore no possibility of an unbalanced condition or tread distortion so the tread runs smooth and even with less rolling resistance. RINGTREAD® is uniform all around and this results in a uniform tread pattern and new tire appearance. The RINGTREAD® System delivers perfect fit and even wear. With its no-splice installation and laser-guided centering on the casing, the end result is a truly balanced retread.


RINGTREAD® are all made with compounds specifically designed for the retreaded tire’s specific type of in-service application, using raw materials from the best suppliers who ensure excellent and long-lasting quality.


RINGTREAD® delivers the lowest cost per mile by providing longer tread wear, better fuel economy and extended casing life for the fleet end-user.


The Marangoni RINGTREAD® System also has numerous and important advantages to the retreader. The RINGTREAD® System is more than just a revolutionary tire retreading product. It is a complete system that applies the ring concept using leading-edge technology. The system is divided into 5 stages, each phase implements highly innovative technical solutions designed to improve product quality: inspection, buffing, repairing, building and curing. 


Just some of the benefits for retreaders who use the Marangoni RINGTREAD® System include: (1) Less material used in the retreading process (2) Reduced labor thanks to enhanced automation and speed of the overall process (3) An increase in production efficiency (4) Greater quality due to the intrinsic features of the RING.


The RINGTREAD® system is superior to conventional flat precure retreads because it offers significant benefits to both retreaders and fleet end-users improving quality and reducing costs.



Q: How was the RINGTREAD® System developed?

A: 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. 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 many years in advance of the competition.

The development of the RINGTREAD® System can be traced back to a process of evolution that has taken place within the Marangoni Group since the early 1950’s. The company had studied the development of precured retreading technology since it’s development in the 1930’s and commercialization in America after World War II. The existing system, although advanced in terms of it’s operational simplicity and it’s advantages for smaller retreaders wanting to be flexible in terms of production schedules, had several inherent deficiencies which, in Marangoni’s view, needed to be solved. These included the problems associated with splicing the flat tread ends together, which can cause a weak spot or an unbalanced condition in the tire. This practice also unnecessarily wasted time and materials.


By the late 1960’s the Marangoni Group felt that there was too little innovation within the retreading industry and that the prevailing technology had already become outdated. 


Carlo Marangoni, working to redesign the process of retreading is credited with revolutionizing precure retreading by perfecting the RINGTREAD® design in 1976.


The main benefit of the RINGTREAD® System is that the splice-less, precured tread rings allow tires to maintain their structural integrity. The contoured tread profile of the ring and the fact that the treads are molded in the shape of the tire as opposed to a flat strip of rubber which has to be wrapped and bent around the tire, assure the compatibility of the ring and the casing along the circumferential contour, the transverse plane and the sidewalls. This in turn means that the tire maintains it’s original equilibrium, making sure that the tire’s range of performance characteristics remain unaltered.


Since first designing and developing the RINGTREAD® system, Marangoni has continually improved on the design and today the Marangoni RINGTREAD® out performs competition due to it’s superior design and the quality control in the manufacturing process.


Today, the Marangoni Group is one of the very few around the world capable of managing all activities involved in the entire tire life cycle: from tire industry machinery and technologies, rubber for industrial applications, new tire manufacturing, retreaded tire production, retreading systems, distribution, and a disposal-based energy recovery process.


This results in numerous high-level synergies that benefit the organization and customers alike.


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

A: 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:

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.


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. 


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