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In the vegetable processing industry, blanching is a crucial pretreatment step. Whether it's quick-frozen vegetables, dehydrated vegetables, or canned or pickled vegetables, they typically require blanching before processing. So, what's the purpose of blanching?
 
The main purpose of blanching vegetables is to:
1. Inactivate enzymes and preserve color.
Vegetables contain a variety of enzymes, which can easily cause the vegetables to darken, lose flavor, or become soft during storage or processing. Blanching quickly inactivates these enzymes, preventing further oxidation and discoloration, thereby preserving the vibrant color and excellent taste.
2. Removes unpleasant odors and astringent flavors
Some vegetables (such as spinach, celery, and beans) have oxalic, astringent, or bitter flavors. Blanching effectively removes these unpleasant odors, leaving the product with a fresher taste.
3. Softens Vegetable Tissue, Facilitating Forming and Packaging:
Blanching softens vegetable tissue, making it easier to press, cut, shape, or vacuum-pack. It also reduces packaging volume, improving transportation and storage efficiency.
4. Improving Subsequent Processing Efficiency
Blanching can shorten subsequent drying, quick freezing, or sterilization times. For example, blanching before quick freezing reduces ice crystal formation time and improves post-freezing rehydration. Blanching before dehydration accelerates water evaporation and saves energy.
5. Cleaning and Sterilization
The hot water used during blanching effectively removes sediment, impurities, and some microorganisms from the surface of vegetables, thereby improving food hygiene and safety.
 
In modern vegetable processing plants, the vegetable blanching machine is the core equipment for the blanching process. Vegetables are evenly fed into the blanching tank via a conveyor belt, where hot water or steam is maintained at a constant temperature. The vegetables are uniformly heated by the heat medium over a set time, inactivating enzymes and sterilizing bacteria. The vegetables then pass through a cooling section to rapidly cool down, preventing over-softening or continued heating.