Processing Technology of Grape Color Preservation in Hot Air Drying Room

Abstract

The invention relates to a grape processing technology and especially relates to a hot air drying room grape color retaining processing technology and belongs to the technical field of agricultural and sideline product processing. The hot air drying room grape color retaining processing technology utilizes a hot air drying room and orderly comprises grape picking, sorting, dewaxing, loading in a disc, loading on a rack, primary baking, peduncle beating, stone removal, color selection, cleaning, loading in a disc, loading on a rack, secondary baking, grading and packaging. Through combination of the hot air drying room, mixed alkali liquor dewaxing, cooling three-stage baking and two-step cleaning and drying processes, the processed raisins effectively retain the natural color, a good taste, controllable quality, good uniformity, cleanness and sanitation.

Description

technical field [0001] The invention relates to a processing technique suitable for grapes, which belongs to the technical field of agricultural by-product processing. Background technique [0002] Grapes have always been synonymous with Xinjiang, especially Turpan. Due to geographical reasons, most of the grapes in Turpan flow to the inland and even abroad as raisins. Taking Shanshan County as an example, it is located in the east of Turpan, about 100 kilometers away from Turpan City. It is one of the main grape producing areas in Turpan. The county’s grape planting area is nearly 300,000 mu, with an annual output of about 900,000 tons of fresh grapes. The raisins are about 80,000 tons, and the varieties are mainly green seedless and Xiangfei. [0003] At present, there are generally two ways to dry grapes in Xinjiang. The first is drying in the shade. This method hangs fresh grapes in clusters in a drying room, and uses natural ventilation and dehumidification to dry th...

AI Technical Summary

Problems solved by technology

[0004] Judging from the color of raisins, drying in the shade can generally obtain green raisins with high commodity circulation value, and the price per kilogram is generally 10-20 yuan (affected by the size of the fruit), but the drying cycle is longer; drying can only obtain the lowest commodity circulation value. The price of a kilogram of red raisins is generally only 3 to 5 yuan, so at present, the drying of grapes is mainly done in the shade.

[0005] Although drying in the shade can effectively guarantee the color of raisins, there are three problems in this method: one is food hygiene. This method generally builds a drying room in the open and windy Gobi Desert, and directly uses natural wind to dehumidify and dry. Affected by mosquitoes and flies, raisins not only contain sand, but also contain insect eggs and mosquito and fly pollutants, which do not meet the food hygiene requirements; secondly, depending on the sky, the drying effect of this method depends entirely on the external ambient temperature and wind speed. If the wind speed is too low, it will cause The entire batch was not able to drain moisture smoothly, and there were problems such as rot and mildew. In the end, the entire batch became yellow dry and red dry with low economic value, causing large economic losses to growers and processors, and a year of hard work paid off. (Each drying room generally bears a planting area of ​​more than 10 mu, and about 30 tons of fresh grapes); third, the drying cycle is long, and the drying cycle of this method is generally 30 to 40 days. A region often ships at the same time, and there are shortages in the early stage and late grapes. The backlog problem, the shipment is too concentrated, and the price fluctuates greatly