Tin Bath


Tin bath.

The tin bath is the heart of every float glass production line; it is a decisive quality factor. Consequently, at CNUD EFCO GFT, it is always tailored to each customer’s requirements. Using process simulation, we are able to extract the ultimate in yield and quality.

More yield with less space

tin bath.

No space is wasted: the CNUD EFCO GFT tin bath is 6 to 9 meters shorter than usual, as the cooling area is optimized. This enables us to offer tin baths that produce the same yield despite their compact dimensions. The tailor-made design also contributes to efficiency. The desired tonnage, the range of glass thicknesses and the products manufactured: everything is taken into account in our design. As a result, you are able to maintain productivity at the same level – or even increase it – while using fewer resources.

Overview of benefits


The compact tin bath reduces investment costs across the board. A shorter building, less steel construction, less space and less tin (up to 30 percent): all this adds up to considerable savings.

Lower OPEX

In addition to the initial investment, the consumption of resources is also reduced, resulting in lower maintenance costs. Less heat loss, less inert gas required, less loss due to atmospheric leakage and less risk of errors due to the smaller free tin surface: these are advantages you enjoy throughout the entire life cycle of the plant.

Higher output

This allows the tonnage of the glass production line to be increased in the event of a cold repair, that is, with an existing glass plant and available space – which means that you produce more output with the same size of tin bath. We will check and individually calculate exactly what and how much is feasible in each specific case.

CNUD EFCO GFT equipment

Get all your components from one supplier.

CNUD EFCO GFT delivers the complete tin bath with everything that goes with it. In addition to design and construction, this includes intelligent equipment combination to ensure optimal plant operation. All components of the plant are manufactured in-house: the tin bath with its highly complex equipment, the top roller and the dross box. Quality-relevant plant components such as the roof, dross box, venting and de-drossing pocket have been further developed on the basis of process simulations in order to optimize the tin bath’s overall efficiency.


  • Tin bath roof
  • Tin bath
  • Venting system
  • De-drossing pocket
  • Dross box
  • Camera system
  • Top roller

Tin bath roof

The tin bath roof completes the tin bath; it seals it and generates overpressure in the tin bath to shield the process from the outside world. Among other things, this is where the uniform temperature distribution is determined, which is a critical factor for optimal glass production. In addition, the protective gas is fed in to reduce atmospheric contamination and prevent defects in the glass.
EFCO, which is now part of CNUD EFCO GFT, was a supplier from the very beginning: the British company Pilkington – one of the world’s leading manufacturers of glass and glass products – made the float glass process market-ready in the 1960s and initially manufactured all components of the production line itself. The first external component in this process was supplied by EFCO: it was the tin bath roof. Since then, this important process component has been continuously optimized. This knowledge base contributes significantly to CNUD EFCO GFT’s all-round expertise.

The first external component in the float glass process was supplied by EFCO: it was the tin bath roof.

Simulation tin bath

It’s good to know in advance what you’re going to get.

In the simulation tin bath, complete tin baths are simulated in advance, optimized and agreed with the customer for the best possible results. At CNUD EFCO GFT, this is now possible for the first time for all four parameters with their mutual dependencies: atmosphere, tin, glass and temperature. In this way, valuable insights can be gained from the process, which in turn are incorporated into the development and improvement of the technologies. This is a milestone in the development of the tin bath.
A sophisticated software tool is used for the calculation and analysis: it works with a 3D design of the entire tin bath as well as the input concerning physical properties and the quantity of materials – and of course with our expert know-how, which is incorporated into the simulation.

Contact us

Talk with a

No matter what questions or wishes you have, you will deal with highly competent contact persons at our company. At CNUD EFCO GFT, the know-how created by our physicists, process specialists and experts from our 50 years of float glass manufacturing history is bundled for you – process knowledge of the complex glass manufacturing process, which is unique in this concentrated form.

Step by step to automated production

Automation can be a gold mine.

As a complete tin bath supplier, we are working to automate the entire process – especially with regard to resource conservation and efficiency. The tin bath is only the first step. Initial successes with the automation of the top roller and the tweel speak for themselves. And the economic potential is enormous: to name one example, just 1% more output from a 700-tonne tin bath means 7 tonnes more yield. And that means just under 3,000 Euros per day – over a million Euros in the course of a year.

Joining forces for the glass industry

Grenzebach and CNUD EFCO GFT: a symbiosis that benefits you in so many ways.

The merger of CNUD EFCO GFT and Grenzebach combines all the system components that are essential for the glass pane in its final form. From the tin bath to the annealing lehr to the cold end and the transport of the finished product to the warehouse: now everything is available from a single source. As a glass manufacturer, you benefit from integrated high-tech solutions with reduced coordination effort – starting from synergies in design and engineering and extending to lifelong service and support from a single supplier.

Your advantages with CNUD EFCO GFT and Grenzebach:

  • Comprehensive technology integration
  • Strong, focused engineering
  • Reduced project management effort
  • Uniform control concepts, fewer interfaces
  • Intuitive operation of the glass plant

Overview of solutions

Annealing lehr

The annealing process is a decisive factor for quality, productivity, and efficiency. With our innovative systems, you can keep it fully under control: the latest technological control applications monitor your process at all times, prevent production losses and help to minimize downtime. This way, they ensure a maximum return on investment.

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Waste heat recovery

Environmental protection and economic efficiency can go hand in hand if the right solutions are used. With our innovative systems for waste heat recovery, you can make your glass production more energy-efficient while creating a new source of energy for your company – this means more profit for you and a big plus in sustainability.

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Service and support

Construction and commissioning of a new glass production line is only the first stage in a good customer relationship. Professional service in daily operation is just as important: We want your investment to be profitable without any interruption – that’s why our engineers are there for you with guidance and support over the entire life cycle of the plant.

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Since late 2019, CNUD EFCO GFT has been part of the Grenzebach Group, linked to it by common high standards of high-tech and quality. A large proportion of the flat glass produced worldwide passes through Grenzebach’s cold end – from inspection, cutting, snapping and stacking to transport. With the integration of CNUD EFCO GFT, the entire float glass production line is now available from a single source.

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