Freeze-dried fruit chips are basically dried at a temperature below 0℃, that is, in the frozen state of the product. Until the later stage, in order to further reduce the residual moisture of the product, the product was heated to above 0℃, but generally not more than 40℃.
Freeze-drying is to freeze a substance containing a lot of water into a solid in advance with a freeze dryer, and then sublimate the solid water directly under vacuum conditions, while the substance itself remains in the frozen ice shelf, so the volume remains unchanged after drying, and the loose pores should absorb heat during sublimation. It leads to the temperature drop of the product itself and slows down the sublimation speed. In order to improve the sublimation speed and shorten the drying time, it is necessary to heat the product properly. The whole drying process is carried out at a lower temperature.
Three advantages
"Three invariants"-the color, nutrition and taste of the product remain unchanged;
No reduction, no increase-the product has not reduced anything except moisture; The product is delicious, and nothing has increased;
High nutrition and low fat-the internationally advanced HACCP quality control system and internationally advanced double-permeable double-permeable dehydration process are adopted, and the nutrients and trace elements in the fruit are retained;
No puffing and no frying-there is no puffing process in the production process of the product, and vacuum freeze-drying dehydration technology is adopted to avoid the frying process of the product.
Crispy products are strictly different from puffed foods such as potato chips, and will become substitutes for puffed foods such as potato chips in the near future.
Recommended freeze-drying equipment for strawberry chips:
Small and domestic: XY-FD- 1 and XY-FD-L 1. The former is the most common configuration without temperature control, and the latter is an upgraded version, which has higher protection for materials, higher catalytic drying rate and shorter drying time.
Small and medium batch production: XY-FD-S 10 pilot freeze dryer has more accurate temperature control accuracy, high silicone oil control accuracy and controllable drying time.
Production-oriented batch production: XY-GY-50 freeze dryer used by production enterprises is suitable for batch production of strawberry crisp and other fruits, and can also be used for other drying.