Method for manufacturing fruit and vegetable humidity-adjusting fresh-keeping film

A manufacturing method and technology of fresh-keeping film, applied in papermaking, textiles and papermaking, water-repellent addition, etc., can solve problems such as excessive chloride ion content, moisture permeability change, air pollution of regenerated cellulose, etc., achieve simple production operation, prevent Accelerates festering and maintains water retention and freshness

Active Publication Date: 2016-10-05
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, "temperature-sensitive and moisture-permeable film" uses nylon or polyester as the base material, and its moisture-permeability can respond to temperature, but it does not respond to changes in humidity. Therefore, when the relative humidity is above 90%, the temperature-sensitive and moisture-permeable film The film itself will generate condensation, especially when it is placed on the fruit and vegetable box of the refrigerator, and it is placed in a low-temperature environment, it is also prone to condensation
Although the Siemens silicon filter membrane has moisturizing properties, its moisture permeability cannot change with temperature and humidity
"Moisture-sensitive and moisture-permeable film" is to apply viscose solution on the paper-based substrate, and obtain a moisture-sensitive and moisture-permeable film through sulfuric acid acid precipitation regeneration and a series of subsequent purification processes, although the moisture-permeable film produced by this method The wet film has the characteristic that the moisture permeability increases with the increase of humidity, but there are several problems in the preparation of the moisture-sensitive moisture-permeable film by this method: First, the production process is complicated and the equipment investment is large
The second is th

Method used

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  • Method for manufacturing fruit and vegetable humidity-adjusting fresh-keeping film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one: base paper: 100% coniferous wood pulp, beating degree 50 ° SR, PAE 1.0%, polyacrylamide 0.5%; Applied coating: base paper adopts the mode of surface sizing to impregnate 7% sodium carboxymethyl cellulose and 0.3 % quinoline copper mixed glue. Dissolving method of sodium carboxymethylcellulose: Dissolve in water at 50-60°C for about 3 hours to form a uniform colloidal dispersion. Surface sizing method: Use a two-roller surface gluing machine for surface gluing, and the amount of glue dipping is 5-7g / m 2 ; Dry and calendered. The test results of the finished paper are shown in Table 1.

Embodiment 2

[0015] Embodiment two: base paper: 100% coniferous wood pulp, beating degree 35 ° SR, PAE 1.0%, cationic starch 1.5%; Applied coating: base paper adopts the mode of double-sided coating to coat 5% sodium carboxymethyl cellulose and 0.3% thiabendazole mixed glue. Dissolving method of sodium carboxymethylcellulose: Dissolve in water at 50-60°C for about 3 hours to form a uniform colloidal dispersion. Coating method: use bar coating, the total coating amount on both sides is 5-7g / m 2 ; Dry and calendered. The test results of the finished paper are shown in Table 1.

Embodiment 3

[0016] Embodiment 3: base paper: 100% softwood pulp, beating degree 35 ° SR, PAE 1.0%, polyacrylamide 0.5%; application layer: base paper is coated with a polymer mixture by double-sided coating, the polymer mixture The formula is: 5% gelatin solution, 1.5% glutaraldehyde cross-linking agent (to gelatin dry weight), 0.5% chitin. The dissolving method of gelatin solution: take a certain amount of gelatin solid and add water to make a concentration of 10% (mass fraction), soak at room temperature for 2 hours, heat it in a constant temperature water bath at about 70°C after it swells, and stir slowly, Until a uniform colloidal dispersion is obtained, then dilute to 5% glue; add glutaraldehyde solution to the prepared gelatin solution, the addition amount is 3% (to the amount of absolute dry gelatin), and then add a small amount of anti-mold and antibacterial agent, stir well and set aside. Coating method: use bar coating, the total coating amount on both sides is 5-7g / m 2 ; Dry...

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Abstract

The invention discloses a method for manufacturing a fruit and vegetable humidity-adjusting fresh-keeping film. Body paper is prepared through papermaking by means of plant fiber as the raw material and by adding a proper wet strength agent and a proper dry strength agent. The body paper is prepared into the humidity-adjusting fresh-keeping film by coating a mixed glue solution composed of a hydrophilic water-retention natural high-molecular polymer and a water-insoluble, safe and environment-friendly mildew-proof antibacterial agent. The manufacturing method is environmentally friendly and simple, and the special humidity-adjusting fresh-keeping film is used for a fruit and vegetable box with a fresh-keeping function and a refrigerator with the fresh-keeping fruit and vegetable box. The fruit and vegetable humidity-adjusting fresh-keeping film can make fruits and vegetables in the fruit and vegetable box hold moisture and kept fresh when relative humidity is small, moisture permeability is remarkably increased when relative humidity is large, and condensation and rotting are prevented. The humidity-adjusting fresh-keeping film can be completely and naturally degraded.

Description

technical field [0001] The invention relates to the technical field of fruit and vegetable fresh-keeping and the technical field of special paper, in particular to the technical field of production of a paper film for regulating humidity and keeping fresh of fruits and vegetables in a refrigerator freezer or a fruit and vegetable box. Background technique [0002] Fresh fruits and vegetables are fresh foods with high water content, and they can still continue to carry out life activities such as breathing and transpiration after picking. During the storage of fruits and vegetables, the consumption of water and nutrients is directly proportional to the intensity of respiration of fruits and vegetables. Losing water is equivalent to losing freshness and weight. Therefore, reducing water loss and inhibiting respiration are important links in fruit and vegetable storage. [0003] In order to prolong the freshness period of fruits and vegetables in the refrigerator, existing tech...

Claims

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Application Information

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IPC IPC(8): D21H15/10D21H21/20D21H21/18D21H21/36D21H21/16D21H19/84D21H17/26D21H19/14D21H19/34
Inventor 刘群华刘文毛萃王月江
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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