Preservative paper for grape and production method thereof

Abstract

The invention provides preservative paper for grape and a production method thereof. The preservative paper comprises preservative, base materials and an adhesive; the preservative and the base material are adhered through a hot melt adhesive; the preservative paper can be in a form that two agents are clamped among three base materials or one agent is clamped between two base materials. The production method of the preservative paper comprises the following steps: heating to melt the preservative and the hot melt adhesive through a rubber pump; uniformly mixing; conveying to scraper guns (9, 10); uniformly coating the mixture on base materials (1, 5); thermally pressing the medium base materials (3) and (1, 5) through a heat-seal roller (13); coiling through a coiling roller (14) into the preservative paper in the form that two layers of agents are clamped among three layers of base materials. The production method has the characteristics that a thermoplastic hot melt adhesive which is low in softening temperature and fast to solidify is utilized, and the preservative is molten by heating, so that the shortage of decomposing the preservative through water used as a solvent is avoided, and moreover, the production excludes drying, and as a result, the preservative paper is high in quality, and the production efficiency is increased.

Description

technical field [0001] The invention relates to a fresh-keeping paper for fruit, in particular to a fresh-keeping paper used for keeping grapes fresh and a production method thereof. Background technique [0002] Grape is one of the four major fruits in my country, and more than 70% of it is used for fresh food. Grapes belong to berries, which contain a lot of sugar, organic acids, proteins, minerals and vitamins, etc., and have high nutritional and diet value. However, grape skins are thin and juicy, with high moisture content. During transportation and storage, they are susceptible to gray mold (BoltyclemPets), Penicillium (Penicilliaspp.), Alternaria (Allemariaspp.), bud mold (CladospriumSp.) and Infection by bacteria such as Stemphylium Sp., Rhizopus stolorifer (Ehrenb.: Fr.) Vuill, etc. causes problems such as shedding of fruit grains, mold growth and rot, water loss and browning of fruit stems, and these problems become constraints An important factor in the develop...

AI Technical Summary

Problems solved by technology

[0006] The first problem is that the ingredients in the antistaling agent are unreasonable: the grape antistaling paper is generally made by mixing and stirring the antistaling agent, water and adhesive to make a paste, then brushing it on the substrate and drying it, as in the patent CN 1279021A, CN1254514A, CN1105081A

However, since the pyrosulfite in the preservative is decomposed into sulfur dioxide when it encounters water, the addition of water in the above production method not only causes the decomposition of the pyrosulfite to release a large amount of sulfur dioxide gas, which directly affects the health of production workers and pollutes the environment. environment, and it takes a long time to dry, it is not easy to use in industrial production

[0007] The second problem is that the production process of grape fresh-keeping paper is cumbersome and the production efficiency is low: grape fresh-keeping paper generally uses the bottom substrate to be made into a bag-shaped grid or a sunken cavity, and then the solid preservative is put into each bag-shaped grid. Or in the cavity, and then use heat sealing, cold pressing or manual methods to bond another layer or double-layer substrate; as in patents CN 1279020 A, CN102894072 A, CN 2481520 Y, CN1760446 A, first in Composite hot pressing between the two layers of substrates forms mutually independent plane grids, and then quantitatively puts preservatives in the grids for dry production, and then cuts, punches, and packs them into products; the fresh-keeping paper made in CN101926387 A has It is composed of 7 layers and needs to be dried for 3-20 minutes; the composite grape preservation paper in patent CN102972513 A needs to be fed twice in order and heat sealed twice, and the production process is really cumbersome

Patent CN101215809 A A combined grape fresh-keeping paper and its preparation method, in which the fresh-keeping paper is made by spraying various formulations of fresh-keeping agents, the upper layer B area of ​​the fresh-keeping paper is sprayed with citric acid solution; the lower layer 1 area is coated with a whole-process release Antistaling agent, the 2nd area is coated with a delayed slow-release antistaling agent, and the 3rd area is pasted with a quick-acting antistaling agent. The production process is cumbersome and it is not easy to form an industrialized production

[0008] The third problem is that the choice of hot melt adhesive is not suitable: patent CN101627783 A uses wax as the hydrophobic material and hot melt adhesive, because the adhesive force of the wax is small, so the medicine powder is not bonded firmly, so that the medicine powder falls off after meeting water vapor , prone to powder leakage during use; and the patent CN1185303 A uses non-water-soluble rosin dissolved in more than 95% alcohol as an adhesive. As we all know, rosin is not instant soluble in alcohol, so it takes a long time to dissolve and bond agent, and the solution is viscous after dissolving, so when other preservative components are added, the viscosity increases, resulting in uneven coating and greater difficulty in coating; patent CN102972513 A is a compound glue coating device in grape fresh-keeping paper and The feeding device is separated, and the adhesive and preservative are not mixed, so the hot melt adhesive in this technology does not play the role of bonding with the substrate, and the adhesion between the three layers of substrates is only through two or two The thermal cooperation between the air-permeable membranes is realized, so it is easy to drop powder during use; although the fruit and vegetable fresh-keeping paper in the patent CN2377203 Y discloses that hot-melt adhesive can be used as adhesive, the fresh-keeping agent and heat-preserving agent in this patent The nature of the melt adhesive, the mixing method and the coating method are not disclosed, and its application is not specifically for the hot melt adhesive applied to the grape fresh-keeping paper; the fresh-keeping paper developed by Wang Dong et al. Coated on the base layer, although avoiding the influence of water on the preservative, the production process needs to be dried due to the presence of organic solvents, and the organic solvents volatilize into the environment during the drying process, which is relatively unsafe (Wang Dong, 1996 )

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