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Sugar Scalping and Grading


The bulk density of sugar ranges from 600 - 800 kg/m3. Sugar must be scalped in order to remove lumps and foreign materials prior to grading or packaging.



Sugar scalping is generally classified into two categories:

  • Rough scalping - through approximately 4M (4,75 mm). Very high rates are possible
        for these applications.

  • Close scalping - from 12 to 18M (1,7 to 1,0 mm). Close scalping is performed in
        refineries or beet sugar factories, and food plants where sugar is used as an
        ingredient. Capacities range from 3000 to 7000 PPH/sq ft (14-35 TPH/mz) on 18M to
        12M respectively. However, these are sharply reduced when near size crystals are in
        the feed.

Because sugar is a food product, sanitary designs are common for machine construction.


  Download a Sugar Scalping brochure (220 KB) Get Adobe Reader




After Scalping, Grading is performed in two stages:

1. Primary Screening

   The primary screeners normally produce three grades:

  • Fine granulated (-14+30M / -1,4+0,6 mm)
  • Extra fine (-30+80M / -0,6+0,18 mm)
  • Powdered (-80M / -0,18 mm)

2. Speciality Screening

   This is most often accomplished with a second set of screeners having two or more 
   decks, and are fed from the primary screeners. Final product specifications vary widely
   among processors.


Sugar is graded from 14 to 80M and is typically concentrated in the 50M (0,3 mm) range. Synthetic or stainless steel screens are normally used. A typical rate for primary screening is 3,4 TPH/m2.


  Download a Sugar Scalping brochure (220 KB) Get Adobe Reader



  • Gyratory motion sifts the material through the screen, rather than forcing it
  • Gentle action minimises screen tears from foreign objects
  • Cleanable sanitary designs
  • Easy disassembly for quick cleanout
  • Totally enclosed - positive sealing
  • Ball mesh cleaning


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