How are raisins made?

How to make raisins: 1. Selection of raw materials: raisins should be varieties with thin skin, plump and soft flesh, beautiful appearance and high sugar content. Generally, seedless white, seedless dew, seedless rose fragrance and milk are used as raw materials. The fruit should be completely ripe, not too ripe.

2. Cut the string: After harvesting, cut off the small and damaged fruit. If the fruit clusters are too big, cut them into small clusters and put one layer on the drying plate.

3. Alkali soaking treatment: In order to accelerate the drying speed and shorten the evaporation time of water, alkali treatment can be used. Soak the injection of 1 ~ 5 in the sodium hydroxide solution with the concentration of 1.5 ~ 4%. Thin-skinned seeds can also be treated with 0.5% sodium carbonate or the mixed solution of sodium carbonate and sodium hydroxide for 3 ~ 6 seconds. After the raw materials are treated with alkali, they are immediately rinsed with clear water. The drying time of fruit treated with alkali can be shortened by 8 ~ 10 days. When drying white raisins, it needs to be fumigated with sulfur for 3 ~ 5 hours.

4. Exposure: Put the grapes in a drying tray and expose them to the sun for about 65,438+00 days. When a part of the surface is dry, you can turn it all over and put it on the surface to continue drying until two-thirds of the fruits are dry. Twist the grapes by hand. When there is no grape juice oozing out, you can fold the drying plate and dry it in the shade for a week. On sunny days, the total drying time is about 20 ~ 25 days.

5. Softening: stacking fruit skewers 15 ~ 20 days, drying evenly, and removing fruit stalks at the same time to obtain the finished product.

6. Packaging: raisins are packed in cloth bags and wooden cases, with 50 kg or 25 kg in cloth bags and 25 kg in wooden cases.