Time filter

Source Type

Milano, Italy

Bonagiunti L.,Tenova Strip Processing
Steel Times International | Year: 2010

Tenova has introduced a chemical coating system and on-line dry coat thickness measurement incorporating automatic or manual feed-back to control the coater in a bid to reach the high precision in thickness of the insulation coating required on silicon steel strip for electrical applications. The main features of high accuracy coating section include automated 4-rolls type coater, dry coating thickness measurement sensor, and coating thickness control system. Two independent preparation systems allow switching from one type of varnish to another while minimizing the loss of uncoated strip. The only way is to measure the dry coating thickness is by dedicated sensors viewing the top and bottom sides of the strip and placed at the exit side of the drying oven. Using batches of concentrated solution with different dry residuals helps to make the dry coating thickness converge to the set value.

Astengo G.,Tenova Strip Processing | Correale L.,Tenova Strip Processing | De Loia T.,CORE , Inc.
MPT Metallurgical Plant and Technology International | Year: 2013

Chinese company Jiangsu Sunshine in Dajiang has started up a new high productivity electrolytic tinning line with the most advanced insoluble anode technology and low-sludge tin dissolution process. The application of Tenova insoluble anode technology minimizes the amount of sludge produced and hence the loss of tin, increasing both quality and productivity at the same time.

Bonagiunti L.,Tenova Strip Processing
MPT Metallurgical Plant and Technology International | Year: 2010

Tenova has designed a high accuracy coating section that measures, in an in-line process, the coating thickness, allowing precise control of the coating process. Tenovas high accuracy coating section combines three main items, including an automated 4-roll coater, dry coating thickness measuring sensor, and coating thickness control system. The automated 4-roll horizontal precision coater features high operational flexibility and the capability to apply a precisely metered amount of product to one or two sides of the strip. Cleaning and maintenance operations are simple to perform thanks to the allowances between the side plates and the roll faces. Two independent preparation systems allow switching from one type of varnish to the other while minimizing the loss of uncoated strip. This coating section, besides controlling continuously the coating process, can assist the operators in handling these transients. When implemented into the existing.

Martines S.,Tenova Strip Processing | Curletto P.,Tenova Strip Processing | Luperi S.,Centra Sviluppo Materiali | Lattanzi L.,Centra Sviluppo Materiali
MPT Metallurgical Plant and Technology International | Year: 2013

The new eco4 pickling process by Tenova and CSM is considered to be the best available technology for newly built and for the modernization of existing annealing and pickling lines for stainless steel products. Before pickling, mechanical descaling is performed by means of a shot blaster. The mixed-acid solution is re-oxidized to continuously regenerate the HNO 2 back to HNO3, through the O2 re-oxidation unit or, in case of nitric-free acidic treatments. In contrast to the conventional process, electrolytic pickling is also performed with H 2SO4 and DC power input followed by AC power input to convert the chromium oxides of the scale and to achieve dissolution of the Cr-depleted layer. An important contribution to making this innovative process/technology environmentally friendly is the adoption of a sulphuric acid bath. This innovative electrolytic process and the cell design allow reaching a better strip quality in terms of roughness and brightness compared to the traditional process.

Bonagiunti L.,Tenova Strip Processing | Ravera M.,Tenova Strip Processing
MPT Metallurgical Plant and Technology International | Year: 2012

The quality of electrical insulation coating is of paramount importance in electric steel production as the market demands an ever broader range of coatings and at the same time increasingly tighter thickness tolerances. In order to meet these key factors plant builders are constantly improving the coating machines and the relevant control systems. This article reports on a recent commissioning of four coating machines for NGO electric steel and the implemented dedicated system for automatic coating process control. Also main results and trends are presented.

Discover hidden collaborations