usually controlled at 250 ppm with a legal limit of 500 ppm in the U% Sulphur dioxide content in the final product, where permitt DRYING The riced potato is fed on to a single drum dryer, as described in Chapter 4 Single drum dryers are used more frequently than double drums, as it is believed that a better bulk density is achieved by this method Potato Flakes have a bulk density of about half that of potato granules, and this may be considered somewhat of a disadvantage in the context of The delivery from the dryer is usually by auger, which breaks down the curtain of dried potato to flake form, and the flakes then pass over an inspection belt for removal of any residual blemish. It is important, as in the case of all dehydrated products, that the flakes flow under and over permanent magnets, or other metal detection devices, before packing. Some drum dryer installations provide for a flake breaker, or Floconeuse, which is reputed to produce more uniformity in flake size Packing This is usually in 15kg polyethylene-lined multi-ply paper sacks, or, for prolonged storage in nitrogen-flushed air-tight drums, with anti-oxidant Ratio Expected ratio is 6.5: 1 POTATO DICE Feed to Line Dry Cleaning Destoner-Washer Peeling Skin elimination hing Inspection-TrimmingSulphur dioxide content in the final product, where permitted, is usually controlled at 250 ppm with a legal limit of 500 ppm in the UK. DRYING The riced potato is fed on to a single drum dryer, as described in Chapter 4. Single drum dryers are used mow frequently than double drums, as it is believed that a better bulk density is achieved by this method. Potato Flakes have a bulk density of about half that of potato granules, and this may be considered somewhat of a disadvantage in the context of packaging costs. The delivery from the dryer is usually by auger, which breaks down the curtain of dried potato to flake form, and the flakes then pass over an inspection belt for removal of any residual blemish. It is important, as in the case of all dehydrated products, that the flakes flow under and over permanent magnets, or other metal detection devices, before packing. Some drum dryer installations provide for a flake breaker, or Floconeuse, which is reputed to produce more uniformity in flake size. Packing This is usually in 15kg polyethylene-lined multi-ply paper sacks, or, for prolonged storage in nitrogen-flushed air-tight drums, with anti-oxidant added. Ratio Expected ratio is 6.5:l. POTATO DICE Feed to Line I Dry Cleaning I Destoner- Was her I Peeling I Skin Elimination I Washing I Inspec tion-Trimming I15