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A carbon infrared oven from Heraeus Noblelight has helped Stoelzle Flaconnage to speed up the curing of organic paint sprayed onto to highly decorative perfume bottles. Its installation has also saved valuable space compared with an alternative hot-air oven at the company’s Knottingley glass manufacturing plant.

carbon infra-red oven from Heraeus Noblelight

Stoelzle Falconnage currently operates five production lines and produces in excess of 110 million glass containers per annum. It offers a range of decoration techniques, including acid etching, automatic and semi-automatic silk screen printing and a twin spraying line for organic colours.

When it was decided to adapt a mothballed ceramics spraying machine to provide much needed additional organic paint spraying capacity to meet the requirements of a large contract, it was realised that there was insufficient space to accommodate a conventional warm-air oven.

At the same time, Stoelzle engineers required that paint drying times should be reduced to match increased production line speeds. After speaking to their specialist paint supplier, Perfomance Paints, of Tewkesbury, they contacted Heraeus and tests were carried out at the Heraeus Application Centre.

As a result, a five-zone oven was installed at the Knottingley site. This sits over the existing conveyor system and each zone consists of two side infrared modules and one top module. Each side module contains four, 7.35kW, twin-tube carbon infrared emitters and each top module one, 7.35kW, twin-tube carbon infrared emitter.

Key benefits of product application

  • Tests carried out have demonstrated that, using carbon infrared, coatings on glass containers delivered at a line speed of 4.4m/min could be cured in 90 seconds as opposed to the 25 minutes required in a warm-air oven.
  • The emitters have a very fast response time of less than two seconds, so the oven can be quickly switched off when there are gaps in the line or in the event of unanticipated line stoppage.
  • The oven can be simply profiled to meet three different heights of bottle by simply switching in pairs of side emitters. Zones 4 and 5 are manually controlled, so that they can be switched to a standby level during line stoppage.
  • Shayne Carr, project engineer at Stoelzle, said: ‘Apart from meeting our requirements for space saving and faster curing times, the new oven has also allowed us greater control over paint curing.’
  • Carr added: ‘It is also more energy efficient than the warm-air alternative and the emitter controllability means that we can quickly adapt to changes in bottle size.’

Heraeus Noblelight

Heraeus specialises in the production and application of high quality energy sources covering the electro-magnetic spectrum from ultraviolet to infra-red. It has over 40 years experience in infra-red technology and offers the expertise, products and systems to provide efficient and effective solutions to drying, heating and curing problems throughout industry.

Heraeus Noblelight GmbH with its headquarters in Hanau and with subsidiaries in the USA, Great Britain, France and China is one of the technology- and market-leaders in the production of specialty light sources and systems. In 2016, Heraeus Noblelight employed 707 people worldwide. The organization develops, manufactures and markets infrared and ultraviolet emitters, systems and solutions for applications in industrial manufacture, environmental protection, medicine and cosmetics, research, development and analytical measurement techniques.

In the 2016 financial year, Heraeus generated revenues without precious metals of €2.0 bn and a total revenue of €21.5 bn. With approximately 12,400 employees worldwide in more than 100 subsidiaries in 38 countries, Heraeus holds a leading position in its global markets.

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