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Grenzebach Maschinenbau GmbH

Postfach 11 55, 86661 Asbach-Bäumenheim/Hamlar
Albanusstr. 1-5, 86663 Asbach-Bäumenheim/Hamlar
Telephone +49 906 9822068
Fax +49 906 9822108


Egbert Wenninger

Senior Vice President Business Unit Glass

Markus Gruber

Vice President Sales Business Unit Glass

John Fluker

James Shang

Robert Lamy

Dennis Schattauer

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Our range of products

Product categories

  • 01  Glass production/Production Technology
  • 01.09  Kiln technology
  • 01.09.03  Annealing lehrs, continuous/intermittent operation

Annealing lehrs, continuous/intermittent operation

  • 01  Glass production/Production Technology
  • 01.10  Cold end technology for float glass, laminated glass, wired glass and other types of flat glass
  • 01.10.05  Stacking machines
  • 02  Glass processing and finishing
  • 02.01  Cutting, breaking and snapping technology
  • 02.01.01  Cutting technology
  •  Cutting technology for float glass

Cutting technology for float glass

  • 02  Glass processing and finishing
  • 02.06  Coating technology
  • 02.06.01  Vacuum coating equipment

Vacuum coating equipment

  • 05  Measurement, testing, control technology and software
  • 05.03  Host computer systems, IT, Communication and Security Technology
  • 05.03.03  Process control systems
  • 05  Measurement, testing, control technology and software
  • 05.04  Software
  • 05.04.02  Optimization of glass cutting and glass production yield

Optimization of glass cutting and glass production yield

Our products

Product category: Float glass technique

Grenzebach and CNUD EFCO GFT offer a seamless glass engineering experience.

Grenzebach and CNUD EFCO GFT’s mission is to cover the journey glass takes from hot to cold. Together, we offer a one-stop solution that covers the tin bath to the annealing lehr all the way to the cold end, the coating phase to conveying the finished product to the warehouse. Why not make use of this outstanding combination?

We view all our employees and their diverse skills on the float glass production line as one team. This approach is beneficial in terms of technology and makes communication easier because there is one single point of contact. Data from all the players are pooled and help create the added value digitalization offers.

Today, more than 300 float glass production lines worldwide use Grenzebach cold-end machinery. As a market leader renowned for providing solutions for annealing lehrs, float baths and accessories, CNUD EFCO GFT was also involved in fitting out over 300 production lines.

Both companies’ experts already know one another from past collaborations and share the same passion for innovations and superior quality. We want to make your processes easier, less complex and minimize risk to you. Reap the following benefits that two global players provide:

  • One stop shop
  • Technology integration across the board
  • Focused, precision engineering
  • Less project management required by customers
  • A standardized control concept, fewer interfaces
  • Plant and equipment design in 3D and via simulations
  • Intuitive glass plant operation
  • Digital solutions for better output, quality and efficient resource use
  • Joint focus on energy efficiency and a better carbon footprint

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Product category: Float glass technique

New Generation of Conveyor Technology

With a new generation of conveyor technology Grenzebach makes it possible to further increase the availability of float glass plants.

Transporting glass gently, carefully and safely has always been one of Grenzebach's top priorities. The specially developed drive train without cardan shafts represents a major step forward. The number of components in the drive has been significantly reduced - cardan shafts and belts are a thing of the past. This now results in even greater dynamics, less maintenance work and a lower spare parts inventory. The new drive train also offers the possibility of connecting all engines directly, which ensures smoother running and higher positioning accuracy. Gentle glass transport all along the line! Thanks to its new design, compact construction and transparent covers, the new conveyor technology generation also provides a clear view of key components and fast access for maintenance work. Of course, existing systems can be equipped with the new conveyor technology so that everyone can benefit from the advantages.

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Product category: Float glass technique

Waste Heat Recovery System

Two of the glass industry’s key challenges include cutting energy consumption during consumption and minimizing the level of CO2 emissions. We offer a cutting-edge, waste heat recovery system for glass plants so that you can achieve climate targets and ensure you receive your operating licenses in the future. And the combined forces of the Grenzebach and CNUD EFCO GFT teams are working on further improvements.

Both melting the glass and the energy used in the process are inefficient. A large proportion of the energy lost is encountered in the flue gas from the furnaces. Waste heat recovery systems (WHR) use this flue gas by generating electricity and power for heating and cooling processes and air conditioning.

Our WHR means you can start protecting the climate now and saving costs because you purchase less electricity and power.

Our environmentally friendly, waste heat recovery units offer exceptional efficiency, fast energy generation and a high level of availability. They can be used in virtually any conditions a glass melting plant operates under.

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Product category: Process control systems, Optimization of glass cutting and glass production yield

Digitalization Platform SERICY

Our glass customers’ key objectives are to raise product quality, increase output and improve resource efficiency.

Our technological developments and services are geared to achieving these goals in your company. We exploit the enormous potential of digitalization to boost the quality and efficiency that our equipment and automated processes have already achieved.


We’re offering glass manufacturers the opportunity to revolutionize their value creation processes. Industry 4.0 creates ecosystems where data-based solutions facilitate glass production in tomorrow’s world.

Digitalization can be used to retrieve a vast quantity of data and value is created by bundling and analyzing them. In the past, each of the phases in a process was treated separately in many cases, but there’s significant room for improvement in applying the data across all disciplines.


Grenzebach and CNUD EFCO GFT can now cover most of the disciplines in a float glass system and their merger is a big step to reaping the rewards of Industry 4.0. Today, we can capture data on the majority of steps in the process. Actual use cases, based on the consolidation and analysis of large quantities of data, generate added value for customers and consumers.

 The SERICY IIoT platform lies at the heart of digital glass production.

SERICY provides data on when, where and to what extent our machinery is required. Intelligent applications transform the raw data into valuable pieces of information, which are fed into the production process, or used for special tasks. In future, intelligent assistance systems will give recommendations to operatives on action that needs to be taken.

Based on the analyzed data, SERICY provides practical information to the head of production on how to change machinery settings to optimize the production process. This converts into even higher quality, more output and less consumption of resources. Because it’s scalable, modular and configurable, SERICY can be customized and you gain a tailor-made digitalization solution.


In the field, valuable data are generated, which were previously not made use of and can now be read and processed with our SERICY’s platform’s Edge device. Edge translates the data so that they can be used by intelligent applications. Interfaces to any subordinate and overarching systems ensure openness, which is a key condition for added value in digitalization.

Our intelligent data handling allows ideal integration from the field all the way to a control system to ERP systems and our own high-level SERICY solutions with machine learning and analytics applications. An example from the real world: A predictive maintenance app tells your team, in plenty of time, when maintenance is required. Your staff are given practical help and our systems raise the availability of your machinery even further.  

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Product category: Float glass technique

Tin Bath

The float process is based on a revolutionary idea by Sir Alistair Pilkington where molten glass is poured onto a bed of molten tin. This method is the basis of industrial flat glass manufacturing up until today.

The molten glass is fed into the tin bath, which contains molten tin in an inert gas atmosphere. The glass mass spreads over the molten tin and forms a continuous ribbon. The underside of the glass floats onto tin in the tin bath and is heated from above to achieve a distortion-free and exceptionally high-quality glass ribbon and planarity on both sides.

In the tin bath, the temperature of the glass drops from 1,050 degrees Celsius or 1,922 Fahrenheit at the inlet to around 600 degrees Celsius or 1,112 degrees Fahrenheit at the outlet and the glass ribbon leaves the tin bath in a formed and pre-hardened condition.

CNUD EFCO GFT supplies the entire tin bath:

  • Suspended tin bath roof, roof casing, heating elements
  • Top rollers including a camera system
  • Coolers
  • Venting system
  • De-drossing pocket
  • Dross box
  • etc.

CNUD EFCO GFT developed a shorter tin bath that delivers the following benefits:

  • Lower investment costs, due to the requirement for a smaller building, fewer steel structures and less tin.
  • Lower running costs as fewer resources, like energy and inert gas, are needed.
  • If space is available, the tonnage of the entire system can therefore be increased.
A 3D design simulation makes a better variant possible. The dependencies of atmosphere, tin, glass and temperature in the whole tin bath can be simulated and analyzed first via a 3D design. The findings pay dividends because float bath technology is enhanced even further.

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Product category: Annealing lehrs, continuous/intermittent operation

Annealing Lehr

Once it leaves the tin bath, the glass ribbon enters an up to 200 meter, or approx. 656 foot annealing lehr. This is a kind of long kiln in which the glass is cooled slowly from about 600 degrees Celsius or 1,112 degrees Fahrenheit to 60 degrees Celsius or 140 degrees Fahrenheit. This controlled cooling process minimizes stresses in the glass, which is vital when processing the glass afterwards.

Therefore, the annealing lehr has a very important role to play. A CNUD EFCO GFT annealing lehr will contribute to a stable glass. In the closed part of the annealing lehr, heat exchangers are used to prevent cooling with ambient air, which prevents contamination during the process and, in turn, ensures better quality glass. We draw on a customized calculation program with a good, decades-long track record and our expertise from 40 years of annealing lehr technology.

Our thickness gage in the hot end measures the thickness of glass ribbons right at the beginning of the annealing lehr. As a result, feedback relevant to the production process is fast. Any deviations from specifications are corrected and resources safeguarded.

  • Combined measurements including temperature, glass ribbon width, glass position
  • The gage can be retrofitted, even when the machinery is running
The data from the annealing lehr help to enhance the production process even further. They are very important for the cold end and specific analysis creates added value thanks to digitalization.

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Product category: Float glass technique

Utilities and Central Power Supply - an eco-friendly feedstock solution

For a float glass plant to operate reliably and at peak performance, it needs a steady supply of energy and other media like natural gas, electricity, inert gas, tin and much more. CNUD EFCO GFT can offer a one-stop solution in this respect. From the start, we liaise with you to plan the supply of energy and media in new plants, extensions or replacements.

As a system solution provider, we have in-depth expertise and experience in delivering energy and media to a whole host of plants. Our objective is to provide a turnkey solution with all the infrastructure, supply lines, sensors and control technology.

We’re equally familiar with open and closed loop cooling water systems and supplying technical gases. To provide H2 and N2 inert gas, we’ll find the solution to match your float gas plant. We combine the high product quality you target with a sparing use of media too. CNUD EFCO GFT is all about green engineering. 


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Product category: Cutting technology for float glass

Dynamic Cutting Technology

Grenzebach’s cutting and breaking technology transforms the continuous glass ribbon into the format required. It allows you to cut glass to size with very minimal product loss.

Longitudinal and cross cutters with force-controlled cutting heads, which are adapted to handle thin, regular or thick glass, score the glass. Cutting pressure is applied precisely based on glass thickness and stress in the glass and by using closed-loop control.

The multi-longitudinal and cross cutters can make various formats, even with very small sheets of glass. By changing dynamically to different cutting bridges, formats are produced continuously without any interruptions.

We have a broad portfolio of solutions for cross, center or lengthwise breaks so that the edges are the best possible quality.

Combined with our digital float scan edge camera and look ahead cutting optimization system, we can offer function-rich cutting technology. All in the interests of superior precision, quality and yield.

Defects in the glass ribbon, such as inclusions, bubbles or stones, force glass manufacturers to dispose of the cullet (waste glass) in a cullet bin. Depending on the roller pitch, the shortest cullet plate was 500 mm or 19 11/16 inches long. Thanks to Grenzebach’s short cullet plate system, this figure can be cut to 170 mm or 6 11/16 inches. This is possible because the cullet is disposed of directly after the break roller.

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Product category: Process control systems, Optimization of glass cutting and glass production yield

Metrology - Good data means better result

As a glass manufacturer, a stable production process is more important than ever these days. Grenzebach’s inspection and measurement procedures stand for advanced control methods and top product quality. The following aspects are measured in real time:

  • Contours and sizes
  • Edges
  • Position of the glass ribbon
  • Thickness of glass and layers
  • Stresses
  • Temperature
  • Quality
  • Surface quality
The data captured are fed back into the production process. They help spot departures from processes at an early stage and trend analyses of recurring problems reduce losses. The production process is fully transparent and full complete product analysis is possible. 

CNUD EFCO GFT and Grenzebach’s integrated approach permits analyses to be made and conclusions drawn about the whole production process. And customers have the benefit of faster response times with minimal use of resources.

Example number one: Ribbon thickness is measured directly at the beginning of the annealing lehr to allow a faster response should production differ from the thickness tolerances permitted. Example number two: At the cold end, Grenzebach measures the glass ribbon’s stress profile, in other words, the stresses that occur within the glass along a measurement line across the glass ribbon, which generate during the cooling process. Thanks to Grenzebach’s SERICY IIoT platform, the settings in the annealing lehr can be changed in order to reduce stress peaks.

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Product category: Stacking machines

Stacking Technology - Good stacking means better glass

For the glass line’s stacking process to work well, it relies on a good sorting process. We can develop a smart system for you so that conveying and stacking are a class act. What’s required are the right number of stackers at maximum capacity to deliver a highly accurate and scratch-free result.

Grenzebach offers best-in-class technologies to guarantee precise stacking at the end of the glass lines. Sheets of glass can be simply removed by hand or by using a fully automatic stacker for small, mid-size, large and extra-extra-large glass sheets of up to 24 meters or 26 yards and weighing up to 3 tons or 6613 pounds.

The sheets of glass can be removed from the tin or air side, from several levels – tiers and drops, statically or picked on the fly. Single or dual pick options ensure greater efficiency. The smart combination of two stackers, which can be used singly or as a pair for extra-long sheets, allows fully flexible production.

The Grenzebach portfolio has a large variety of handling equipment, ranging from portal stackers, swing stackers, direct stackers, under-table stackers and robot technology. At the same time, a range of different combinations of handling equipment and platforms. And it’s all adapted to cope with the subsequent material flow.

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Product category: Vacuum coating equipment

Coating Technology


Architectural glass showcases buildings. Grenzebach’s PVD coating technology turns the raw material into an energy-efficient component. PVD large-area glass coating is a core technology that meets requirements in terms of functionality and appearance. Grenzebach provides turnkey equipment for the entire coating process and materials handling. We’re the only supplier when it comes to fully automatic and customized coater solutions that can produce thermal insulation and solar control layers on glass. And of course, service for the PVD coaters installed worldwide is part of the package. Three decades of experience mean we know coaters inside and out.

PVD stands for Physical Vapor Deposition. This is a process where laser beams, magnetically deflected ions or electrons and arc discharge vaporize the material known as the target. The result is a pure, metallic surface without any contaminants, which is a must in order for coatings to stick properly.

Our fully automatic PVD coaters allow the production of state-of-the-art coating systems ranging from Solar Control to high-end Low-E coating systems. The coaters can also apply all types of coating destined for exclusive products. Examples include dielectric (electrically insulating) materials such as Si3N4 or TiO2 to ultra-thin metal and blocker layers like Ag and NiCr all the way to special coatings for use in displays or the solar industry such as transparent, conductive layers (ITO, ZnO, ZnMgO). Our PVD systems are designed to deliver anything customers could possibly want in terms of coating.

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Company news



12 Oct 2020

"We see the world through glass": Grenzebach with tangible innovations at glasstec virtual

Offer further expanded as a companion along the entire glass line - Clarify individual questions in face-to-face web meetings

"I am very pleased that Messe Dusseldorf is making it possible to present our key topics and innovations in digital formats to interested parties on all continents. We are very excited about glasstec virtual", says Egbert Wenninger, Head of Business Unit Glass at Grenzebach. glasstec virtual from October 20 to 22, 2020 is an international event for the industry in a new format where Grenzebach and CNUD EFCO GFT will be appearing together. The two partners, who have been working together on projects for many decades, now cover a large part of the hot and cold sections of flat glass lines as an integrated global player.

 A common focus is on energy efficiency. A highly efficient waste heat recovery system (WHR) is already being presented to the industry at glasstec virtual. Other key topics at the virtual trade fair event include digital glass production, advances in coating technology, the new generation of conveyor technology and a collaboration app that makes service support for glass production technology even more powerful worldwide. Numerous tangible innovations to advance the glass industry - all under the motto: "We see the world through glass".

With digitalization and coating technology in the Conference Area

The experts from Grenzebach will be present at glasstec virtual with presentations on coating technology and digitization in the Conference Area. There will also be webinars on the integrated work of Grenzebach and CNUD EFCO GFT and on the new Collaboration App. "We are happy to use the various formats that Messe Dusseldorf makes possible for glasstec virtual. In doing so, we are making a targeted selection for our partners because we are also aware that a lot of information is currently flowing to everyone in the glass industry in digital rooms", Markus Gruber, Vice President Sales Business Unit Glass, notes.

In the glasstec virtual "Conference Area" Grenzebach is represented with two topics:

  • "Coating Technology: Increases the value of the glass " - Dr. Jens Ellrich on October 22 from 10 to 10.30 am
  • “Digitization of Glass Production - Added value for all users” – Peter Seidl & Maximilian Ocker on October 22 from 12 to 12.30 pm
Individual sessions on individual concerns

During the glasstec virtual as well as afterwards, Grenzebach experts offer personal face-to-face web meetings. "It is important for us to be able to conduct concentrated one-on-one conversations with our partners and customers during the web sessions - just as both sides know and appreciate it from targeted trade fair appointments," says Markus Gruber. Depending on the customer's wishes, the focus of the face-to-face web meetings can be on individual innovation topics, and Grenzebach's experts will naturally address specific questions and concerns of the customers. Gruber: "We look forward to direct exchange with our partners and customers - and to the impulses from these discussions. It is very important to us to be available as a sparring partner for all concerns during the glasstec virtual.

Collaborate even more closely with Collaboration App

Interested parties can find out how Grenzebach, as a sparring partner of the glass industry, is using the new collaboration app in a webinar at glasstec virtual on October 21, 2020 at 1.40 pm. Florian Nagler, Head of Global Service Sales at Grenzebach, will show how the Collaboration App makes remote support even more powerful. In a production environment managed by SERICY, cross-company collaboration is possible at any time. Maintenance staff and production planners can plan maintenance together; tasks can be distributed and photos and videos can be shared via the integrated chat. "Via a live video stream, our service specialists can provide customers with concrete support and instructions for work on the system - bringing us as a partner much closer again". Florian Nagler emphasizes: "Being close to our customers throughout the entire life cycle of a production line is an important core of our corporate and service philosophy. Wherever the individual participants are located. The Collaboration App is another important step forward - crisis-proof even against events like the COVID 19 pandemic. Through the app, we and our customers can share our wealth of experience with one another.

 Grenzebach & CNUD EFCO GFT: Solutions from one source

Keyword experience: Grenzebach and CNUD EFCO GFT have an immense knowledge of applications with 300 installed systems worldwide. Both companies have been among the technology innovators in the industry since the 1990s. Together they cover a large part of the trades involved in a flat glass line, and customers benefit in many ways from their joint expertise in the hot and cold areas. Together they say: "We see the world through glass".

From Hot to Cold: Flat glass manufacturers benefit from the cooperation between CNUD EFCO GFT and Grenzebach through integrated solutions from a single source. From the tin bath to the cooling channel to the cold end, from coating to transport of the end product to the warehouse, everything can be planned together. Joint engineering means for customers, among other things, a uniform operating philosophy and an even more uncomplicated spare parts inventory. Data from numerous trades can be analyzed together and used for optimization. Markus Gruber, Vice President Business Unit Glass, will give an overview of the joint offer of the global player at the webinar on October 20, 2020 from 1.40 to 2.10 pm. 
Film off - Competencies and innovations at a glance

From applications for digital glass production to waste heat recovery systems: with films that visitors to glasstec virtual can access in the showroom, Grenzebach provides further insight into solutions to current issues that are of concern to companies in the glass industry. "It is important for us to take up the pressing questions of our partners on all channels - and thus to provide continuous information until we can meet again in person at glasstec 2021," says Egbert Wenninger.

Take along impulses until glasstec 2021

The Grenzebach experts are taking the impulses from the talks held at glasstec virtual with them in their preparations for glasstec 2021. Egbert Wenninger: "We are already looking forward to seeing our partners from all over the world in Dusseldorf in June 2021 in a very real way. Until then, we will be happy to be available at any time for an exchange of information and opinions". With a common perspective, the digital and analog world will continue. "We see the world through glass".

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23 Apr 2020

Grenzebach and CNUD EFCO GFT with highly integrated solutions for the glass industry

Grenzebach, market leader for Cold End equipment in float glass production lines, acquiring CNUD EFCO GFT, a leading provider of solutions for annealing lehrs, tin bath and accessories.

Two leading providers for flat glass production technology unite their strengths: The Grenzebach Group with its headquarters in Hamlar near Augsburg acquired CNUD EFCO GFT, the business unit float and container glass of the BMT Group. "In the past, we frequently built our Cold End following the tin bath and annealing lehr from CNUD and one could clearly tell that both companies stand for high-tech and quality", says Egbert Wenninger, Senior Vice President Business Unit Glass at Grenzebach.

Integrated solutions for customers world-wide

World-wide there are over 300 flat glass production lines with Grenzebach Cold End equipment. CNUD EFCO GFT offers solutions for annealing lehrs, tin baths and accessory machinery, has a great reputation and a leading position within the market and contributed to the installation of 300 production lines. CNUD EFCO GFT has several international locations in Belgium, Germany, Romania and China - and going forward will also profit from the Grenzebach locations in China in the USA. "Together with integrated solutions we are a unique partner for our customers world-wide", says Dennis Schattauer, Managing Director of the GFT GmbH. He continues: "The daily exchange within the Grenzebach Group with automation and digitalization experts is readily available to us. This will push our team even more." With a common strategy glass production technology will further be optimized and automated.

Higher quality, more sustainability

One-cast solutions for increasingly complex float glass production lines, joint technological improvements and new developments, creation of additional values with innovation for the digital glass industry and a focus on energy efficiency: The close cooperation between Grenzebach and CNUD EFCO GFT will bring advantages to customers for product quality, economic efficiency and sustainability. Integrated control system and inspection technology can be realized with know-know collected from several decades. CNUD EFCO GFT has extensive experience in the thermal processes of glass lines - upstream the Cold End where the quality of the glass ribbon and therefore the customer’s profit is decided.

Data record of the complete production line

These empirical values and the process knowledge from CNUD EFCO GFT are combined with data resulting from Grenzebach’s inspection solutions. With SERICY, the digitization platform developed by Grenzebach, future data can be collected on the complete float glass production line and be available for optimizations at the glass manufacturers - up to detailed recommendations for equipment operators as well as solid indications for the quality manager. Example #1: The sheet thickness is measured at the beginning of the annealing lehr in order to be able to react early on should production neglect the admissible thickness tolerance range. Example #2: At the Cold End Grenzebach measures the glass ribbon tension profile, i.e. the tensions within the glass along a measuring line across the glass ribbon, which is created during the cool down process. With Grenzebach’s IIoT platform SERICY it is possible to directly adapt the annealing lehr settings to achieve the optimum tension curve. With this integrated approach significant improvements can be realized. "In the future, we are able to detect, analyze and achieve all relevant production parameters of a campaign or even a single sheet along the complete line for subsequent follow-up", says Wenninger.

Consistent control system, optimized usability

For the tin bath and the annealing lehr in the forming area, as well as for the cold end, a consistent control system with less interfaces and improved usability will be possible. These examples show the increased potential of cooperation in terms of digitalization. The digitization of flat glass production lines is one of the innovative drivers within the glass industry.

All from one source - transport included

From the tin bath to the annealing lehr to the Cold End and the transport of the final product to the warehouse, Grenzebach is now able to offer the complete equipment. Synergies derived from design, common development and planning from the integrated production lines allow for smooth realization of projects with a clearly reduced coordination effort for the glass manufacturers.

Improvement of energy efficiency
Reduction of the energy consumption and the output of emissions, such as CO2 are fundamental challenges for the glass industry to achieve climate targets and to receive future operating permits. The experts from Grenzebach and CNUD EFCO GFT work together to build improved heat recycling systems for flat glass equipment. "The improvement of energy efficiency of flat glass production technology is an important item on our joint agenda", says Dennis Schattauer. Last but not least, we are able to prove that it is possible to significantly reduce energy consumption and the CO2 emissions with digital means.

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About us

Company portrait

Grenzebach is a leading automatization solution provider for the global glass, building material and intralogistics market. In addition, the company develops new application areas, such as Friction Stir Welding, the automatization of industrial additive manufacturing and digital networking. The digitization platform SERICY allows customers to develop their own future-proof digital know-how. Grenzebach ranks among the international technology leaders in its markets. The global manufacturing footprint with production sites in Germany, Romania, the US and China, as well as additional worldwide locations ensure customer support on-site. More than 3,000 systems installed in more than 55 countries stand for quality and reliability. Since the company opened its doors 60 years ago, it has been owned by the founding family. With an export ratio of more than 90 percent, Grenzebach is a global player.

Company data

Export content > 75%
Number of employees > 500
Foundation 1960
Area of business Glass manufacture/production technology