Sulfur dioxide fresh-keeping laminate, preparation method and application

Abstract

The invention provides a sulfur dioxide fresh-keeping laminate. The laminate at least comprises a first base material, a second base material, an adhesive and a sulfur dioxide releasing agent, whereina mixture of the adhesive and the sulfur dioxide releasing agent is uniformly distributed between the first base material and the second base material, the first base material and the second base material tightly adhere to each other under the action of the adhesive through heating and pressurizing, and the sulfur dioxide releasing agent tightly adheres to the adhesive through heating and pressurizing; the first base material is a breathable material; the sulfur dioxide releasing agent comprises one or more of sodium pyrosulfite, potassium metabisulfite, sodium hydrogen sulfite and potassiumhydrogen sulfite; the amount of sulfur dioxide in the laminate is 3-40 g per square meter. The laminate has is simple in process, the quality is easy to control, continuous production can be achieved,the production efficiency is high, the labor consumption is low, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of fruit preservation, and more specifically, relates to a sulfur dioxide preservation layer, a preparation method, and an application for fruit preservation. Background technique [0002] Grape is one of the important fruit varieties in my country and is deeply loved by the people. According to statistics, by the end of 2015, China's grape cultivation area was close to 12 million mu, with an output of 13.669 million tons. Since 2011, the production of table grapes has ranked first in the world, and since 2014, the grape cultivation area has jumped to the second place in the world. , wine production ranks eighth in the world, China has become the world's largest producer of grapes. According to statistics, due to the impact of post-harvest transportation and preservation factors, the loss of grapes after harvest is as high as 15% to 25%. [0003] At present, sulfur dioxide is widely used as a grape preserv...

AI Technical Summary

Problems solved by technology

[0004] Grape fresh-keeping sheets (Chinese patent CN200410036500), grape fresh-keeping powder, and sulfur dioxide fresh-keeping pads filled with sodium pyrosulfite in a grid shape cannot meet high-speed and high-efficiency production due to the limitation of equipment production efficiency.

The sulfur dioxide fresh-keeping mat prepared by coating composite method has relatively advanced technology, but its coating agent preparation, coating process and equipment are relatively complicated, and the investment in environmental protection equipment and production equipment is relatively large.

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