Apple Crisp Processing Technology

There are two main types of processing technologies for apple crisps: Air Expansion Puffing and Vacuum Frying. The detailed process flows are as follows:

1. Air Expansion Puffing (Non-fried)

Process Flow: Raw material → Selection → Cleaning & peeling (coring) → Slicing → Color protection → Pre-drying → Moisture equalization → Air expansion puffing → Cooling → Packaging → Inspection → Storage

Key Steps in Detail:

1. Raw Material Selection: According to the NY/T 1072-2013 standard for processing apples. Select apples with moderate maturity, free from pests and diseases.

2. Cleaning, Peeling & Coring: Wash apples thoroughly, peel and core manually or mechanically, then rinse.

3. Slicing & Color Protection: Slice horizontally into ring shapes, 3-5mm thick. Immerse in 0.02%-0.03% NaHSO₃ solution for 15-20 minutes.

4. Pre-drying: Dry in an oven at 65-70°C until the moisture content is 25%-30%.

5. Moisture Equalization: Balance moisture in a 4-8°C environment for 5-10 hours.

6. Air Expansion Puffing: Puff at 95-100°C for 6-8 minutes, then vacuum dry at 70-75°C for 60-80 minutes.

7. Cooling & Packaging: Cool to below 40°C, then immediately package with nitrogen flushing or vacuum packaging.

2. Vacuum Frying

Process Flow: Raw material → Pre-treatment → Slicing → Color protection → Blanching (enzyme inactivation) → Immersion → Quick freezing → Vacuum frying → De-oiling → Seasoning → Packaging → Finished product

Key Steps in Detail:

1. Raw Material Selection: Jonathan apples are preferred. Varieties like Ralls Genet, Jiguan, and Golden Delicious are also suitable.

2. Pre-treatment: Immerse in 1% NaOH solution and 0.1%-0.2% detergent solution at 40°C for 10 seconds, then rinse with clean water.

3. Slicing: Slice into uniform 3mm thick pieces.

4. Color Protection: Immerse in 1% salt solution or 0.1% citric acid solution.

5. Blanching: Blanch at 80-90°C for 2-6 minutes to inactivate enzymes.

6. Immersion: Immerse in syrup with 30% sugar concentration.

7. Vacuum Frying: Fry at oil temperature 110°C, vacuum degree 0.095 MPa, until fruit slice temperature reaches 50-60°C.

8. De-oiling: Centrifuge under vacuum to remove excess oil.

9. Seasoning: Spray crisps with a mixture of 0.01% chicken oil flavor, 0.1% citric acid, and 12%-15% sugar solution.

3. Simplified General Process Flow

Washing → Raw material selection → Draining → Peeling, coring & slicing → Rinsing & color protection → Drying → Cooling & Packaging

4. Process Comparison

5. Key Control Points

1. Slice Thickness: 2-5mm uniform thin slices to ensure even drying/frying.

2. Color Protection: Prevent oxidation browning using solutions like salt, citric acid, or sodium bisulfite.

3. Moisture Control: Moisture content 25%-30% after pre-drying, ~5% in the final product.

4. Packaging Requirements: Vacuum or nitrogen-flushed packaging to prevent moisture absorption and softening. Shelf life: 12-18 months.

Both processes have their advantages: the Air Expansion Puffing process is healthier (non-fried), while the Vacuum Frying process offers a crispier texture and allows for flexible seasoning. Companies can choose the suitable process route based on product positioning and equipment investment.+861516967012