The new headquarters of the Group, which has a history of 165 years of steady growth, serves the business units HF TireTech Group and HF ToolTech Group.

The designing of the new office is tuned to the needs of the Group’s forward march. Direct access from the office facilities to the assembly hall and machine testing area brings all fields of work close together and ensures optimised communication. The established and well proven production unit in Belišće, Croatia remains. Continuous investments in logistics, painting, warehousing and machining under highest economic aspects guarantee state of the art manufacturing.

Back on track

The COVID 19 pandemic and the global lockdown that came with it saw HF being tested hard for its resilience and the capability to help its partners put their production process back on track through its engineering and other services.

“For HF, partnership means to support its valued customers with benefits that will help to keep their production back on track,” says HF TireTech Group Managing Director Dr. Joern Seevers.

HF´s benefits & services for the tyre production are many:

• Technical support for restarting the HF Curing Presses

• Inspection and readjustment of mechanical settings

• Inspection of safety-related components

• Performance check and functional analysis of hydraulic/pneumatic systems

• Software check-up and functionality test

• Close coordination and supply of spare parts

• Individual training for technicians and service people for a smooth and efficient production ramp-up; trainings can take place on customers site or in Hamburg at the Group’s testing press. Virtual support is also available

Dr. Seevers said: “Together with our customers we analyse production processes, optimise, adjust to changed situations, look behind the production and develop new strategies to achieve more flexibility, increase quality, reduce costs and raw material - get into action with a higher level in automation and smart retrofitting and be ready for sustainable tyre production.”

Tandem Mixer technology:

HF takes it to the next level

HF Mixing Group is supplying Tandem Mixers for more than 15 years and has kicked off a revolution in mixing since then. The concept appears to be simple, but all those years of experience have shown that the highest degree of machine engineering has to be combined with extensive process know how to make a Tandem Mixer successful. And a mixing line is only successful if the calculated output and productivity is achieved – combined with a reliability which enables stable production for years.

As matter of fact to develop the process to mix on a Tandem Mixer takes some time and efforts – not to forget the technological know-how of the mixing process itself. HF offers the possibility to accompany this development by offering extensive trials and engineering studies – to shorten the time from ordering a machine up to the point of running in full production.

The goal of a Tandem Mixer is to reduce the specific cost of mixing a compound – on many occasions, HF has proven that overall cost reductions of 15% can be achieved compared to standard lines with a single mixer. This, in between other, is achieved by reducing the mixing steps for a PCR compound from 2,5 to 1,5 steps.

But productivity is not the only driving factor to invest in a Tandem Line – the quality of the compound overall and specifically constant and repeatable mixing of modern compounds is to be ensured. To optimise dispersion, distribution, temperature control and process stability makes a significant difference in today’s production of more complex compound recipes. The intermeshing mixers produced by HF and used in a Tandem Line guarantee to meet these requirements more than any other mixers on the market.

Experiences have shown that no compromise on quality can be made – and HF is supporting this approach with delivering a control system for Tandem Lines which enables their customers to not only run the machine efficiently but also uses online condition monitoring to always reflect on a reliable compound quality which is repeatable.

HF emphasises on result driven production concepts for its customers – further innovations in terms of integrating industry 4.0 solutions to the mixing process are on its way and the focus is clear: Intelligent machines will integrate new digital solutions into the mixing process and will ensure to meet the expectations of the future.

Brownfield projects

The COVID pandemic put a stronger focus on replacing existing machines instead of adding new capacities to a production plant. Also, productivity as well as sustainability aspects are driving many tyre companies to have a closer look to the installed base.

But inspecting a mixing line which has run for more than 15 years (or sometimes even 25 years) brings to light what challenges may come up if this line will be replaced by a new one. Output values need to be increased, a new mixer technology should improve the quality of compounds, modern automation solutions should support the daily production procedures and increase process stability – many more requirements should be met. One of the largest challenges is limited space when looking at an upgrade of machinery.

Not only the pure space but also intralogistics within a mixing line can create headache – from upstream equipment feeding a mixer all the way to downstream machinery processing the batch further – many modern solutions can be used today but looking at the available space installing them is the challenge.

With a clear focus on such brownfield projects, HF has managed several conversions from old to new with unmatched success. A key in such projects is the planning and pre-engineering process. Starting with an inspection of not only the mixer but all surrounding factors in the building – considering also the material flow – and then continuing with a 3D- scan of the existing equipment including pipe and cabling routing the basis for planning can be laid. Supported by this 3D-scan HF engineers plan and design with 3D models the complete mixing mill room.

By keeping the existing machinery as the base layer and inserting new equipment in an over-lay collisions of steel constructions, limitations in space and optimised pipe and cable routing can be identified. Furthermore, an improved process flow chart is the basis of planning material flow, work processes and even manpower to operate the new mixing line. Finally, new controls and automation solutions – on the basis of industry 4.0 – will improve operating and monitoring the equipment.

One of the largest benefits using HF’s Pre-Engineering is shortening the planning and execution time – and last but not least the reduction of financial funds is possible by starting up the new line much quicker compared to the conversion of lines in earlier years.

Safety first

Supporting all major tyre manufacturers with mixing technology HF constantly strives for improving operational procedures in the mixing mill room. When it came apparent that the variety of compounds increased more and more – driven by many more types and technologies in tyres today – the changeover times from one recipe to the other was put in the focus of operational optimisation. Not only flexible automation solutions are required but also quick availability of the mechanical equipment after the last batch of the current recipe was dispatched. In between other HF identified the cleaning of the mixing chamber as a critical action during changeover in two aspects: First it needs to be safe for the maintenance personal to enter the mixing chamber and secondly time can be saved if the access to the chamber can be optimized.

In order to meet both requirements HF’s engineers designed a maintenance box, the so-called mBox©, which is mechanically integrated directly underneath the mixer – combining the mixer with the chute of a dump extruder for example.

In the moment the mixing line is switched to cleaning mode and all movements of parts are blocked a moveable platform – the floor of the maintenance box – is inserted horizontally underneath the mixer. A door of the box can be opened, and maintenance personnel can enter the box safe and secure, standing underneath the mixer with easy access to the mixing chamber.

Besides the safe working environment customers from HF have noticed saving time and having the opportunity of even inspecting the mixing chamber easier and more frequent during a changeover.

Especially in new installations of a mixing line the mBox© can be integrated in the design of the line easily and right from the start – benefitting the safety and operation of the line daily.

HF Screw Presses

The production of screw presses is one of HF`s core competences for decades. The screw press has gained recognition during its affiliation with KRUPP. Thus, the presses operate all over the world and more than 2.500 presses are installed in various industries for example the edible oil industry, biomass technology and rendering. And, most interesting for the tyre industry, the presses accomplish benchmarking results in the dewatering of natural and synthetic caoutchouc. As a more efficient and space saving solution instead of band dryer systems or similar the screw press has its strong eligibility in dewatering process.

HF Curemaster

HF brought the first hydraulic column type curing press to the tyre industry in 1997. Since then, it continued to develop this product to meet the demanding requirements of its customers.

The HF Curemaster was launched two years ago and since then the patented truck tyre curing press has been successfully installed in multiple locations and in efficient operation. The press provides a flexible and compact footprint, making it possible to replace older presses with potentially more presses per existing trench.

The HF Curemaster also focuses on optimising energy efficiency to ensure the lowest total cost of ownership in the curing plant. The HF Curemaster´s hood design incorporates insulation inside the hood to provides the best insulation effect. In addition, the HF Curemaster provides an extremely fast cycle time to minimise the overall amount of heat loss during the open and close sequence of the press.

HF PCR Design

Delivering for a new greenfield plant is relatively straightforward. However, HF understands the important need of the replacement market as well. It is important to be flexible to meet all the varying trench layouts (pit, shelf, pitless, and so on). Equally important is the need to be able to replace existing 42” – 45” old mechanical presses with 48” – 52” modern presses in order to meet the growing demand for larger tyre sizes.

All replacement projects are analysed carefully together with customers. Attention is paid closely to all details related to operation, maintenance access, mould & bladder change requirements as well as all local safety regulations. HF´s long experience with curing presses provides a large variety of modular options to be used for finding the optimised fit for each specific request.

HF Stack Passenger Car Inflator (PCI)

The requirement for post cured tyres continues to grow in the market and HF has designed a simple and compact solution that can be incorporated in all HF presses as well as behind most all existing older presses.

The patented HF Stack PCI design allows for the PCI to be integrated into even the tightest footprints. This solution eliminates any movement or rotations of the PCI body itself and greatly reduces the amount of moving mechanical components and maintenance.

HF Digitalisation

HF recognises the important trend of digitalisation for the tyre manufacturers and has developed reliable, customised software solutions for machine data communication between machine control and customer IT systems. The main steps were to focus on MES, SCADA and Recipe Management interfaces.

HF Smart Curing enables customers to get started quickly and effectively with a future-oriented digitisation solution. The main advantage in this case is that software for machine data acquisition is supplied directly by the supplier and not by IT service providers.

OPC server technology and efficient network solutions are tailored to the machine enable secure data acquisition. This software can provide feedback in regard to condition monitoring, diagnostic function, machine services, energy monitoring and remote service.

The benefit of connecting your equipment with digitalised solutions clearly accelerates a target-oriented development and improves the Total Cost of Ownership of the equipment.

Pirelli has renewed its collaboration with Toyota Gazoo Racing in North American rallying, a partnership that will see the new Toyota GR Corolla Rally RC2 make its competitive debut this weekend at the 100 Acre Wood Rally. This marks the second round of the season and reintroduces the Corolla name to international rally competition.

The vehicle, developed specifically for the RC2 category of the American Rally Association (ARA), is derived from the road-going GR Corolla and has been meticulously refined with contributions from Jari-Matti Latvala and Juho Hänninen. Central to its development was the use of the latest Pirelli AT Scorpion gravel tyres, an advanced evolution of a tyre family already widely respected in the World Rally Championship for its consistent reliability and performance. These same tyres will be used throughout the entirety of the American season.

American driver Seth Quintero has been selected to pilot the new machine for the remaining rounds of the championship, bringing fresh energy to the campaign. The Toyota GR Corolla Rally RC2 represents a significant technical achievement, blending production-based design with competition-focused engineering. The development process benefited from extensive testing and the input of world-class drivers, ensuring the car is well prepared for the challenges of the ARA. With the Pirelli AT Scorpion tyres providing a proven foundation for gravel performance, the team enters the season with strong momentum and clear objectives for the rounds ahead.

Terenzio Testoni, Rally Activity Manager, Pirelli, said, “It’s a pleasure to see our collaboration with Toyota renewed in American rallying with a technically exciting project such as the Toyota GR Corolla Rally RC2. The ARA championship is a top-level series that adds to the many rally and GT programmes supplied by Pirelli around the world. We are ready to bring our experience to support Toyota in this new challenge.”

Hoosier Racing Tire, a subsidiary of Continental AG specialising in the production of racing tyres, has entered into a significant multi-year agreement with Street Car Takeover, assuming the roles of Presenting Sponsor and Official Tyre for the prominent street car racing series. This collaboration positions Hoosier at the forefront of a dynamic motorsport platform known for its high-energy atmosphere and rapid growth within the automotive community.

The partnership ensures Hoosier's prominent visibility throughout the entirety of SCT's event lineup. This includes a presence at preliminary gatherings, main racing days, collaborative activities and featured car showcases. By becoming the series' official tyre, Hoosier deepens its dedication to the racers and the vibrant culture that defines the sport, ensuring its products are integral to the competition.

Street Car Takeover orchestrates national weekends that combine various forms of racing, including traditional drag racing and roll racing, alongside substantial car shows. These events create an immersive experience centred on street car enthusiasm, drawing thousands of participants and spectators. The diverse competition classes accommodate a wide spectrum of vehicles, from everyday street-driven machines to extensively modified high-performance builds.

To enhance competitor support, a Hoosier Racer Incentive programme will be active throughout the season. Participants using Hoosier tyres across all racing classes will earn additional championship points, providing a tangible reward for their choice of equipment during the SCT tour. This commitment to grassroots competitors extends into the car shows held at each event, where special incentives and awards will recognise exceptional vehicles fitted with Hoosier tyres.

The 2026 Street Car Takeover season is set to commence with its opening event at Famoso Raceway in Bakersfield, California. This weekend marks the first of 17 scheduled race events, where racers and fans will gather to experience a programme filled with high-speed competition, displayed vehicles and continuous activity.

Nic Moncher, Head of Marketing, Hoosier Racing Tire, said, “Street Car Takeover represents the heart of grassroots street-car performance, showcasing real racers, amazing cars, undeniable competition and an incredible lifestyle scene. At Hoosier, our mission has always been to fuel passion, pride and success. We're proud to partner with SCT, bringing even more performance, competition and excitement to every event.”

Chase Lautenbach, Founder, Street Car Takeover, said, “Hoosier Racing Tire is an iconic brand in drag racing, and we couldn’t be more excited to welcome them as the Presenting Sponsor and Official Tyre of Street Car Takeover. Their reputation for performance, innovation and racer support makes them a perfect fit for our racers and our fans.”

Hankook Tire has introduced the Laufenn S Fit 2, a new addition to its sporty tyre lineup that emphasises consistent performance, efficiency and durability while upholding the premium standards of the Hankook brand. This marks a significant milestone as the first Laufenn model to be selected as original equipment by European automobile manufacturers. The Laufenn S Fit 2 is now widely available in 94 sizes ranging from 15 to 20 inches, with a dedicated SUV version offered in sizes from 16 to 20 inches.

Engineered specifically for the European market, the tyre underwent rigorous testing to ensure it performs reliably across diverse driving conditions. It delivers strong grip and stability for agile cornering on dry asphalt, confident control during heavy rain and a smooth, comfortable ride through city traffic. A key technical advancement is the high silica compound combined with convex tread blocks, which enables nearly 90 percent of sizes to achieve the top EU wet grip classification of A. This represents a 16 percent reduction in braking distance compared to its predecessor. Furthermore, four wide linear grooves enhance water evacuation, resulting in a 10 percent improvement in wet handling and increased directional and lateral stability at higher speeds.

The S Fit 2 also demonstrates notable gains in sustainability and cost efficiency. With a rolling resistance rating between B and C, the tyre supports exemplary fuel economy. The integration of a new generation of polymers contributes to a 15 percent increase in mileage over the previous model, thereby reducing long-term tyre costs. Additionally, the refined tread pattern minimises vibrations and noise, significantly enhancing acoustic comfort.

Beyond its performance credentials, the Laufenn S Fit 2 offers a high load capacity and low weight, making it suitable for a broad spectrum of vehicles. Looking ahead, Laufenn tyres designed for plug-in hybrids and electric vehicles will feature a dedicated EV marking on the sidewall, a strategic characteristic of this second-generation product line that is already present on the S Fit 2.

Jang Hyuk Moon, Vice President – Marketing, Hankook Tire Europe, said, “With the Laufenn S Fit 2, we are strengthening the profile of our brand in the summer segment. The fact that the tyre is also being used as original equipment for the first time is an important milestone and shows that Laufenn is continuing to gain substance in the European market.”

The AZuR project group on chemical recycling has published a comprehensive glossary to establish clear and consistent terminology in the field of used tyre processing. This resource aims to support a common understanding among industry professionals, scientists, politicians and the media by defining key technical terms and explaining complex processes transparently.

The glossary was compiled by Claus Lamer and Robert Weibold (both of Robert Weibold GmbH), along with Dr Ann-Kathrin Andresen (ING.-UP). It covers essential concepts related to chemical tyre recycling, such as pyrolysis and devulcanization, while also including other relevant recycling methods for context.

Pyrolysis, a central process in chemical recycling, involves the thermochemical decomposition of shredded tyres at high temperatures without oxygen. This process yields valuable outputs like pyrolysis oil, gas and recovered carbon black. The generated gas can be used to power the plant, making the process highly energy efficient. Devulcanisation is another technique highlighted, as it allows vulcanised rubber to be reprocessed into a usable secondary raw material.

These advanced recycling methods are crucial for advancing a sustainable tyre circular economy. They provide a climate-friendly alternative to landfills or incineration for tyres that are no longer suitable for repair or retreading. By transforming end-of-life tyres into valuable secondary raw materials, chemical recycling keeps resources in circulation and reduces reliance on fossil fuels.

With this glossary, the AZuR project group provides a foundational technical reference to guide future discussion and development. It encourages a balanced assessment of the opportunities and limitations of these technologies, promoting innovation that supports a fully functional circular economy.