H.A.C. - Hot Air Cooling

Printable Version

In the float glass process, the glass ribbon is cooled down from 1100°C to 600°C during the forming on the tin bath. A part of the heat is evacuated by water coolers, inserted through the side walls. Simultaneously, electrical heaters in the crown allow for the fine adjustment of the ribbon temperature profile and for bath heating during ribbon stops.

The water coolers have to be inserted or removed for every adjustment of the ribbon temperature exceeding the resistance heater capacity. In the case of a ribbon stop, all coolers have to be removed quickly.

Fives developed new, proprietary heat exchangers that operate with air instead of water.

This new technology has a series of advantages:

  • The hot air extracted from the coolers can be used for energy recovery.
  • The pressure in the coolers is reduced compared to the water coolers eliminating leakage risk.
  • The cooling rate can be adjusted by the air flow thus allowing a fine adjustment of the ribbon temperature - with all coolers in place.
  • The coolers can even stay in place in case of a ribbon stop.
  • The higher surface temperature of the coolers reduces tin condensation and the risk of ribbon defects.


The new hot air coolers can be integrated in a new tin bath or replace in an existing tin bath the water coolers or boost the cooling capacity.
Last but not least, the coolers can be converted to heaters ! This allows reducing or suppressing the costly resistance heating in the bath roof. Moreover, the costly and maintenance intensive water cooling circuit for the tin bath can be downsized.

⇒ For recruitment-related matters (application, etc.), please do not use this form. Make your requests on this page.

In order to address your request, we need to collect the information listed in the form below

Information on data processing

As a data processor, FIVES implements personal data processing when managing your contact request. The data collected are required for this processing and are retained, unless you object, for a period of 6 months from the last contact between you and FIVES. If the information is incomplete, FIVES will not be able to respond to your contact.

The data collected are exclusively for the use of FIVES departments.

Pursuant to current legislation, you have the right to request access to data concerning you, their correction, deletion and portability, as well as a right of limitation over processing of your data.

These rights can be exercised by email to DPO@fivesgroup.com or by post to the Data Protection Officer at the following address: FIVES, 3 Rue Drouot, 75009 Paris, accompanied by a copy of an identity document.

In case of a dispute involving processing of your personal data, you have the right to make a complaint to the French Data Protection Agency (CNIL).

To find out more about our personal data protection policy click here


Despatch of these emails is managed by a FIVES partner located in the United States, an active member of Privacy Shield. The partner guarantees processing compliant with European requirements for personal data protection. Unsubscribe with a single click on a link in the message received.

* required fields

Your message has been sent and will be treated as soon as possible. Thank you for contacting Fives.

Sorry, we encountered a problem, your message was not sent