PureFinish® Stainless Steel Treatment For Optimum Hygiene

PureFinish® is a post-processing technique.  This technique allows stainless steel to be finished to a smoother surface with a low and reproducible SRI value below 0.010.  In practice, this produces a surface with a very low degree of adhesion characteristics. The PureFinish® treatment has been extensively tested by TNO. TNO, a Dutch organisation is the leading institute for Applied Scientific Research.  The SRI value (Soil Retention Index) was investigated because this parameter most accurately describes the relationship between surface structure, contamination and cleanliness.

Within the food and pharmaceutical industries hygiene is a top priority, not only for safety but also to prevent contamination and to ensure the quality of the product in terms of taste, aroma and appearance.  The occurrence of contamination through bacteria, proteins or other elements must therefore be prevented.  Process plants require a defined, homogeneous and reproducible surface for all parts that come in contact with food, beverage and pharmaceutical products.

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Blast Cleaning Of Welded Constructions

These machines are capable of cleaning and descaling complex welded fabricated components and constructions. They are designed specifically to clean wide head and base plates, ribs, re-enforcements along with the welded seams after construction.

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All round blasting is achieved after 3D simulation and actual placement of the blast wheels in the optimum locations of the blast chamber. The chamber can be designed with 2 blast zones, each zone designed to blast clean the surface of the infeed side and the second, the outfeed side and end. As the fabrication passes through the chamber, all gussets, re-enforcements, ribs, angles are descaled and cleaned to Sa Swedish standards and with the desired profile to optimise the adhesion of the coating to be applied.

The equipment requires to easily meet the most stringent customer specifications regarding surface cleanliness and cost, for steel traders, steel fabricators, equipment manufacturers, shipyards and manufacturers of wind power stations. In wind power applications roller conveyor systems are utilised for shot blasting of the steel sheets or plate required for the fabrication of the towers for off-shore and land based windmills.

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Typical applications fall into these fabricating industries:

  • Steel traders/ distributors
  • Steel fabricators
  • Equipment manufacturers
  • Gas and oil
  • Aerospace
  • Power generation – including wind turbine columns
  • Transport – rail, bus, lorry, earthmoving, agricultural
  • Steel portal frame, tower block, stadium and steel construction
  • Bridge , crane, access, scaffolding and lifting gear

Partners for Steel

There are distinct benefits to be offered by the cooperation between the manufacturers of both shotblast equipment and multispindle drill/saw lines. The objective of cooperation (as partners for steel) is to support customers in resolving the interface problems between the various technologies, integrating shotblasting, measuring, marking, drilling and sawing or punching and shearing or coping and profiling thereby offering customers added value and profit from the processing of steel.

Click here for information on cleanliness standards

Click here for information on surface profile

For further information on roller conveyor shot blast machines please click here

 

Haydn Kitchen New APost written by
Haydn Kitchen
Shot Blasting Technical Manager

 

Structural Steel Descaling

Steel trading companies and fabricators shot blast their steel plate, sections and pipes to achieve a degree of surface cleanliness that is required before protective coatings are applied or other surface preparation needs.

Automated roller conveyor shot blast systems offer solutions which guarantee a highly-efficient descaling, rust /oxidisation removal and general surface cleaning of all kinds of steel.rrb

Shot blasting is a process for the surface treatment of plate, pipes, beams, tubes and bars.

Due to the design, roller conveyor shot blast systems are ideally suited for this application as it allows fast and highly-effective cleaning and surface preparation and at the same time, provides the surface with a profile to which a coating will adhere well, accommodating a wide- range of commercial to marine offshore standards.

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The equipment descales the surface of the steel ready to accept a first-class coating, or further engineering processes.

Equipment design and efficiency are paramount and should include the following as basic design and inclusions;

  • Infeed and outfeed vestibules should be long enough to stop abrasive escapement
  • The blast chamber itself should be constructed from wear-resistant manganese steel
  • The blast chamber requires to be further periphery lined with replaceable tiles again manufactured manganese steel, for durability
  • The blast requires to be delivered by a number of highly-efficient blast wheels set at an ideal angle to optimise the blasting coverage of the profile or plate
  • The blast wheels require to be driven by highly energy efficient electric motors, that are energy saving to the latest design standards of power efficiency
  • The system requires to recycle the abrasive and to include an airwash separation screen that is also highly-efficient in its function of separating out dust, scale and fines out to waste bins
  • Only good cleaned abrasive should be recycled back for re use
  • Abrasive level control is a vital inclusion, as without information, the efficiency of cleaning, repeatability and uniformity of the steel surface is all but impossible
  • A rotational brush and blow off unit, after blasting will complete the process and provides a very clean component that can be either removed from the outfeed conveyor or be handled automatically for further processing
  • Dust and contaminated air requires to be always drawn through the shotblast system under negative atmosphere, and passed through a very efficient cartridge-type dust collector/filter unit with a discharge back into the hall as low as 1mg/cu mtr down to 0.5 micron particulates and has an efficiency of upto 99.09%
  • By placing the cleaned spent air back into the building, residual and any ambient heat can be retained in the winter months which can contribute to the reduction of heating costs of the internal working environment

Generally, standard equipment concepts allow the processing of components from 1000mm wide, upto 5200mm wide and 600mm high. Other configurations may be offered as bespoke equipment and to accommodate more complexly designed fabrications.

Click here for information on cleanliness standards

Click here for information on surface profile

For further information  on roller conveyor shot blast machines click here

 

Haydn Kitchen New APost written by
Haydn Kitchen
Shot Blasting Technical Manager