Why Choose A Pineapple Slice Drying Production Line

The pineapple slice drying production line is a set of automated equipment that processes fresh pineapples into dried pineapple (preserved fruit type). The core process revolves around several key stages: peeling, coring, and slicing; color protection treatment; sugar infusion or pre-drying; and drying and shaping. Depending on the final product form, the drying technology and configuration will differ significantly.

Dried Pineapple (Preserved Fruit Type): Peeling and coring → Slicing → Hardening and color protection → Sugar soaking and infusion → Drying → Tempering and packaging

Pre-processing Section (Common): A complete production line usually starts with washing, then sequentially passes through a peeling machine, a coring device, and a slicing device. Peeling and coring pineapple is relatively special because pineapples have "eyes" and a hard core, requiring specialized equipment. Production lines on the market are typically equipped with a dual-head peeling machine and a pneumatic coring and segmenting machine. The slice thickness can be adjusted according to product requirements, ranging from 3–4 mm (for preserved fruit type) to 5–10 mm (for certain processes).

Color Protection and Sugar Infusion Section (Core for Preserved Fruit Type): After slicing, the pineapple slices need hardening and color protection treatment, commonly soaked in a mixed solution of 0.1% calcium dioxide + 0.1% sodium bisulfite for 8 hours to prevent browning and maintain shape. They then enter the sugar infusion stage, using a 40%–50% sucrose solution, through multiple immersion and heating concentration methods to allow sugar to penetrate the fruit flesh until the pineapple slices become semi-transparent. In patented production lines, automatic brine mixing, concentration detection, and insulated soaking tanks are also installed to improve efficiency and consistency.

Drying Section (Key Differentiating Stage):

Dried Pineapple (Preserved Fruit Type): Hot air circulation drying is mostly used. Patented production lines use a three-chamber continuous drying drum. The first chamber is independently heated, while the second and third chambers form a circulating hot air loop with hot air pipes, combined with a dehumidifier to control humidity, achieving continuous production. The drying temperature is usually set at around 65°C until the moisture content drops to 25%. There is also a tunnel drying process that uses a rapid drying method at 90–120°C for 15–20 minutes, with the final moisture content controlled at 10%–12%.