![]() Steam peeling- Batch process (BAT in the Food, Drink and Milk Industries, June 2005)īatch steam peeling is also called “flash steam peeling”.Steam peeling is reported to be more economical than abrasion, knife and caustic peeling. The above installation is applicable for all fruit and vegetables which are peeled, except where the peel is relatively hard compared with the fruit flesh, unless it is further processed to make stewed fruit or juice. Literature: BAT in Food, Drink and Milk Industries, June 2005 This can be compared with the outputs if abrasion peeling followed by knife peeling is used.įigure 1: Steam peeling process in an example installation in Finland ![]() The steam peeling process in an example installation is shown below. Product loss in the peeling process in 8-15%. If water cooling is not used then less water us used, less waste water is produced and there are lower organic loads in the waste water. When steam peeling is applied, cold water may be used to condense the steam. It also produces waste water with high levels of product residue. Steam peeling used large quantities of water up to five times more than the amount required for caustic peeling, but half of that for a combination of abrasion and knife peeling. Steam peeling uses approximately five times more steam, e.g. Still, increased steam is used compared to both wet and dry caustic peeling, while high volumes of water are consumed and waste water is more contaminated. Additionally, it uses less water than a combination of abrasion and knife peeling. Steam peeling leads to reduced waste production compared to other peeling techniques, and the peel is often recovered and used as animal feed. If dry brushing is used to remove peel using a brush conveyor instead of water, it is reported that serious bacterial contamination of the brushes and the damage of the fruit or vegetable tissue will inevitably occur. This water may be filtered and used to wash raw fruit and vegetables. Any remaining traces are sprayed off with water. Most of the peeled material is discharged with the steam. ![]() The steam is fed directly into the drum, generally at a lower pressure than the batch process and the product is heated during an adjustable residence time. The continuous steam peeler is a drum with a screw inside.
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