Litchi lychee canning method
The method of manufacture has the following steps:
1. Fruit selection: Choose 80% or 90% of the mature fruit. The majority of the skin is bright red, and the green part must not exceed 1/4 of the fruit surface. Graded after selection, generally divided into more than 3.2 cm and 2.8-3.2 cm two. Less than 2.8 cm is used as a raw material for litchi juice. The fruit must be fresh and it must be shipped to the factory within 24 hours of harvesting, and no more than 36 hours at the latest. After entering the factory, it is necessary to carry out fruit selection. All small fruits, peels are browned, and soft rot or mildew broken must be removed.
2. Wash the fruit: Wash with water first, then immerse it in 0.1% potassium permanganate solution for 5 minutes, then rinse with flowing water for 5 minutes. When dipping, operate carefully and do not operate the peel to avoid contaminating the pulp.
3, peeling, to the core: with the size of the heart through the cylinder (size and diameter 1.5-1.6 cm, small head diameter 1.3-1.4 cm, the end of the ground into a sharp) and the end of the knife with a sharp knife, according to the size of the skin with a through heart The big or small head of the tube is inserted into the fruit pedicle. Turn it slightly. Do not use too much force so as to touch the seed. Use the tip of the knife to insert a slight turn along the cut of the mandrel to completely separate the flesh from the seed nucleus. Then use a forceps to hold the seed core and remove the peel from the hole near the hole. When operating, keep the integrity of the flesh. Immediately after the nucleus is stripped, put the pulp into clean water. Do not contaminate and avoid contact with any iron tools. The flesh should be harvested with the stripping, and about 2 pounds of flesh will be sent to the next process.
4, grading finishing rinsing: peeled and cored after finishing. Crack the separated flesh away. If the flesh has nuclear chips, nuclear membrane and nuclear shank, it must be cut with scissors. Put the finished pulp in a perforated sieve (not more than 4 pounds per sieve) and rinse in flowing clean water. The shorter the time, the better. It is better not to exceed 2 minutes. The pulp after peeling and enucleation should be sorted and rinsed within 12 minutes to minimize the contact time with air. Immediately after rinsing, it is sent to the canning tank. The shorter the time for the above process, the better. Otherwise, it will affect the redness of the pulp.
5, canning: with 567 grams (108 pairs of type) ferrite cans and iron cover anti-acid paint. Empty cans should be washed first and then sterilized with boiling water. The amount of flesh loaded is 330-335 grams per can, which is sent immediately after canning.
6, irrigation sugar water: sugar water as a filling liquid inside the canned, when the temperature is 20 °C, the white sugar solution is measured with Baume degree of 30%, and use citric acid to adjust the sugar solution to about 0.2%, sugar water poured into each pot For 242 grams, the temperature at which the sugar water is poured should not be lower than 75°C.
7, exhaust seal: After pouring sugar water, immediately into the exhaust box. The exhaust box is filled with steam, and the temperature reaches about 90°C. The time for the cans to pass through the exhaust box is about 6-7 minutes. After passing through the exhaust box, the temperature of the tank core can reach 75°C or more. Immediately after the exhaust is capped and sealed with a sealer. After sealing, check that the seal is good. Sterilization must be performed within 10 minutes after sealing.
8. Sterilization and cooling: The water in the sterilizing pot is boiled, and then the can is put in, and then the hot water in the pot is reworked and warmed, and the time is calculated when the water boils again, and is completed in 3 minutes. The entire sterilization process requires 10 minutes to finish. Canned out after sterilization, quickly into the cooling pool, cooling with water, so that the tank temperature down to 30 °C, the shorter the cooling time the better, otherwise it will affect the pulp red.
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