Guizhou Bamboo Shoots Liquid Nitrogen Freezing Equipment Manufacturer ZDYT/SDX-2

Description :

　　Introduction to the process of liquid nitrogen quick freezing bamboo shoots (for reference only)

　　1. Process flow of frozen bamboo shoots

　　Raw material selection - cleaning - peeling - removing bamboo shoots and coarse fibers - slicing (silk) - blanching - cold water spray cooling - cold water soaking cooling - frozen water soaking cooling - draining - quick freezing - inspection - packaging - sampling - refrigeration - cold chain transportation - refrigerated sales.

　　2. Key points of operation

　　Raw material selection: Fresh and pest free hemp (sweet) bamboo shoots that meet the safety requirements of national hygiene standards for pollution-free vegetables are selected.

　　Raw material pretreatment: Clean the raw materials thoroughly, then use a sheller to peel off the bamboo shoot shell, manually remove the bamboo shoot coat, cut off the fibrotic part of the bamboo shoot base, slice or shred according to specifications, and immediately rinse with running water to prevent browning and fermentation of the bamboo shoot meat.

　　Blanching: The purpose is to inactivate the activity of enzymes in bamboo shoot tissues and kill bacteria, prevent bamboo shoot flesh fibrosis, oxidation discoloration, and microbial contamination. Blanching in hot water at 96-98 degrees Celsius for 2 minutes is crucial to the microbiological hygiene standards of the product, and the process conditions should be strictly controlled.

　　Select fresh bamboo shoots that are plump, intact, clean, have good color, no decay, no mold, no odor, and no pests, diseases, or mechanical damage that affect consumption. Within 2-8 hours after harvesting, place them in a 1-5 cold storage and pre cool for 10-24 hours;

　　Pre cooled fresh bamboo shoots undergo shell removal, cleaning, and sectioning treatment;

　　Soak in a solution of composite brittle protectants containing antioxidant or polymer substances for 20-60 minutes;

　　After soaking, drain the water from the bamboo shoots and pour in liquid nitrogen to rapidly freeze them in an environment of -40 to -198 degrees Celsius to the center temperature of -10 to -20 degrees Celsius.

　　Fresh bamboo shoots that have undergone rapid freezing are stored in a -10 to -25 cold storage for less than 24 months to obtain frozen bamboo shoots.

　　Measuring the glass transition temperature of bamboo shoots is crucial for ensuring their quality stability. It is of great significance for developing reasonable freeze-drying or rapid freezing processes, preserving freshness, reducing losses caused by mold, and thawing.

　　Pre cooling treatment: The closer the temperature of the material is to the freezing point before freezing, the faster the material freezes and the better the product quality. Therefore, before quick freezing, the material temperature is gradually reduced to around 10 degrees Celsius through two stages: cold water spraying, cold water soaking, and frozen water soaking. In order to control the growth and reproduction of microorganisms, chlorine containing disinfectant is added to the cold water and frozen water used to soak bamboo shoots. The cold water and frozen water should be in a flowing state to improve the cooling effect.

　　Dripping: The pre cooled bamboo shoots are transported to the freezing area by a stainless steel conveyor belt while being vibrated and blown to remove surface moisture and prevent them from sticking together during freezing.

　　Quick freezing: using the Zhuoda Yuntong liquid nitrogen quick freezing machine for quick freezing at a temperature of -70 degrees Celsius; The rapid freezing process of bamboo shoots is divided into two sections: the surface freezing zone and the deep temperature freezing zone. After entering the freezing chamber, the bamboo shoots are first rapidly cooled, that is, the surface is cooled to the freezing point temperature to freeze the surface, and then enter the second section for deep temperature freezing until the center temperature is below -18 degrees. The entire freezing process is completed within about 20 minutes.

AfterSalesService :

• Liquid nitrogen freezer