CN107217544B - Ultra-thick humidity-adjusting fresh-keeping composite module, manufacturing method and application - Google Patents
Ultra-thick humidity-adjusting fresh-keeping composite module, manufacturing method and application Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
- B32B43/003—Cutting
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/22—Agents rendering paper porous, absorbent or bulky
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
Abstract
The invention discloses an ultra-thick humidifying and refreshing composite module, a manufacturing method and application thereof, wherein a core layer of the ultra-thick humidifying and refreshing composite module is an ultra-thick humidifying and refreshing paper base material with the thickness of 0.5-2.0mm, the front and back surfaces of the paper base material are bonded with antibacterial and mildewproof non-woven fabrics by ultrasonic point hot bonding to form an ultra-thick humidity-regulating fresh-keeping composite module, the super-thick humidity-regulating fresh-keeping composite module is cut into a proper size and assembled on a fruit and vegetable fresh-keeping box, and can maintain high humidity in the box and small condensation amount.
Description
Technical Field
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 fruit and vegetable humidifying and fresh-keeping functional module in a refrigerator refrigerating chamber or a fruit and vegetable box.
Background
Fresh fruits and vegetables are fresh and alive food with high water content, and can continue to perform life activities such as respiration, transpiration and the like after being picked. In the storage process of fruits and vegetables, the consumption of water and nutrient substances of the fruits and vegetables is in direct proportion to the respiration intensity of the fruits and vegetables, and the water loss is equivalent to fresh loss and weight loss, so that the reduction of water dispersion and the inhibition of respiration are important links for the storage of the fruits and vegetables.
For prolonging the preservation period of fruit and vegetable food in a refrigerator, the phenomenon of reducing water loss is realizedThe technology comprises the step of arranging functional films such as a temperature-sensing moisture-permeable film, a silicon filter film, a humidity-sensing moisture-permeable film and a humidity-conditioning preservative film with the application number of 201510094346.7 on the fruit and vegetable box. In general, a "temperature-sensitive moisture-permeable film" uses nylon or polyester as a substrate, and has a moisture-permeable ability that can respond to temperature but does not respond to humidity changes, so that when the relative humidity is above 90%, the temperature-sensitive moisture-permeable film itself generates dew, and particularly when the temperature-sensitive moisture-permeable film is disposed on a fruit and vegetable box of a refrigerator, the temperature-sensitive moisture-permeable film is easily subjected to dew formation even when placed in a low-temperature environment. Although the Siemens silicon filter membrane has moisture retention performance, the moisture permeability of the Siemens silicon filter membrane cannot be changed along with the temperature and the humidity, the humidity in the fruit and vegetable box is as high as 100 percent, and the condensation is serious. The 'moisture-sensitive and moisture-permeable film' is prepared by applying an adhesive solution on a paper-based substrate, and performing sulfuric acid precipitation regeneration and a subsequent series of purification treatment processes, and although the moisture-sensitive and moisture-permeable film prepared by the method has the characteristic of increasing moisture permeability with the increase of humidity, the moisture-sensitive and moisture-permeable film prepared by the method has the following problems: firstly, the production process is complex and the equipment investment is large. The process firstly needs to prepare viscose solution, namely dissolving pulp (natural cellulose) into alkali cellulose, reacting the alkali cellulose with carbon disulfide to generate cellulose xanthate, and dissolving the cellulose xanthate in dilute alkali liquor to obtain the viscose solution. After the viscose is coated on the paper base, complicated process procedures such as acid precipitation regeneration, water washing, desulfurization, water washing and the like are needed. Secondly, the production process has high requirements on water quality and equipment, deionized water is used in the whole process, the water consumption is very large, and the equipment needs to be resistant to corrosion of acid, alkali, carbon disulfide and the like. Thirdly, the investment of environmental protection facilities is large, and the pollution risk is high. The regeneration process of the regenerated cellulose has high pollution risks such as air pollution, water pollution, residual chlorine and the like. Because carbon disulfide is used in the process of preparing the viscose liquid, part of the carbon disulfide exists in a free state, hydrogen sulfide is generated by side reaction in the process of regenerating xanthate, and toxic substances provide severe tests for preventing and treating the production site environment and atmospheric pollution; in the production process, a large amount of washing waste liquid after acid precipitation, washing waste liquid after alkali desulfurization and washing waste liquid after bleaching are generated, so that the problem of treating a series of washing waste liquids exists; in the bleaching ofThe bleaching liquid used in the process is generally sodium hypochlorite, and if the subsequent water washing is not thorough, the problem that the content of chloride ions exceeds the standard exists, which is a great contraindication of paper for food. Although the humidity-adjusting preservative film with the application number of 201510094346.7 can maintain the relative humidity in the fruit and vegetable box to be more than 90 percent, the fixed quantity is only about 50g/m2The moisture absorption and retention materials are less, the density is higher after the high molecular polymer is coated, and the dew condensation amount in the fruit and vegetable box for 3 days still reaches about 2.0 g.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an ultra-thick humidity-conditioning and fresh-keeping compound module, a manufacturing method and application.
The invention adopts the following technical scheme: the ultra-thick humidity-regulating fresh-keeping paper base material and the antibacterial mildew-proof non-woven fabric are compounded into a humidity-regulating fresh-keeping functional module through ultrasonic point-shaped thermal bonding, wherein loose and porous fiber materials with good moisture absorption and moisture retention performance and high polymer in the ultra-thick humidity-regulating fresh-keeping paper base material can absorb excessive water vapor, retain moisture and automatically regulate the humidity, so that the purposes of high moisture preservation and fresh keeping and less condensation are achieved; the humidifying and fresh-keeping functional module prepared by compounding the ultra-thick humidifying and fresh-keeping paper base material and the antibacterial and mildew-proof non-woven fabric has the functions of easy cleaning, service life delay, antibacterial and mildew prevention, attractive appearance and the like.
The super-thick humidifying preservative paper base material is prepared by mixing at least one plant fiber pulp in bleached sulfate wood pulp and bleached sulfite wood pulp with the beating degree of 20-25 DEG SR, at least one high-water-absorption fiber in cotton pulp, viscose fiber and tencel fiber with the beating degree of 20-30 DEG SR, and at least one low-melting-point chemical fiber in a small amount of SWP fiber, polypropylene fiber and polyester fiber, wherein the fiber ratio is as follows: 25-70% of plant fiber pulp, 20-70% of high water absorption fiber and 5-10% of chemical fiber. By adding assistant agents such as PAE with the relative absolute dry fiber amount of 1.0 percent, antibacterial mildew preventive with the relative absolute dry fiber amount of 0.5-1.0 percent, moisture absorption fluffing agent with the relative absolute dry fiber amount of 5 percent and the like, wet papermaking equipment is adopted to manufacture the humidity-adjusting fresh-keeping paper base material with the thickness of 0.5-2.0 mm.
The manufacturing method of the super-thick humidity-conditioning and fresh-keeping composite module comprises the following steps: firstly, a wet papermaking device is adopted to produce the ultra-thick humidity-regulating preservative paper base material, the wet papermaking device is one of an inclined wire paper machine, a long wire paper machine, a multi-cylinder paper machine and a wet papermaking machine, wherein the wet papermaking machine is used for curling wet paper pages on a large cylinder in a multi-layer mode, when the wet paper pages reach a certain thickness, a high-pressure water gun is used for cutting the wet paper pages to form flat wet paper pages, a large flat plate squeezer is used for squeezing excess moisture, and a hot air dryer is used for drying to obtain the ultra-thick humidity-regulating preservative paper base material. Secondly, compounding antibacterial and mildewproof polypropylene fiber or polyester non-woven fabrics on two sides of the paper base in a dotted mode through ultrasonic waves to manufacture a fresh-keeping compound module which is high in thickness, capable of being cleaned, high in moisture retention performance and capable of automatically adjusting humidity; the composite module is cut into a proper size and assembled on the fruit and vegetable preservation box, so that higher humidity in the box can be maintained and the condensation amount is very small.
The super-thick hydrophilic paper base material has more microporous structures than a thin paper base material, can contain more water vapor, and can release partial water vapor to keep high humidity in the box if the humidity in the box is reduced; when the humidity in the box is very high, the box can absorb redundant water vapor, prevent condensation and achieve the aim of automatically adjusting the humidity. The water absorption performance of the cotton pulp, the viscose fiber or the tencel fiber is higher than that of the common bleached chemical wood pulp fiber, and the extra water vapor in the preservation box can be absorbed by adding the high-water-absorption fiber, so that the moisture retention performance is better. The cotton pulp has better water absorption performance than chemical wood pulp, and can endow paper with better strength and paper formation uniformity through proper pulping; the water absorption performance of the viscose fiber and the tencel fiber is better than that of cotton pulp, and the paper can be endowed with better water absorption and retention performance by adding a proper amount; the moisture absorption bulking agent with a proper amount is added to promote the absorption of water vapor, and the purposes of bulking paper and increasing the stiffness can be achieved.
The two sides of the super-thick paper base material need to be compounded with non-woven fabrics, and because the common plant fibers and viscose fibers or tencel fibers can not be hot-melted and can not be thermally bonded with the non-woven fabrics produced by polypropylene fibers or terylene, a proper amount of chemical fibers which can be hot-melted at the temperature of 150 plus 220 ℃ need to be added into the base paper, so that the thicker paper base material and the non-woven fabrics are firmly thermally bonded in a point-like manner at the instantaneous high temperature of ultrasonic waves.
Because the thickness of the super-thick humidifying preservative paper base material is as high as 0.5-2.0mm, the super-thick humidifying preservative paper base material needs to be used in a humid environment for a long time, the needed wet strength is high, if dry paper making is adopted, a large amount of adhesive needs to be sprayed in the middle of fibers, and pressing is adopted to enable the fibers to be firmly combined, but the air permeability of the dry paper is still too high, the moisturizing effect is influenced, and the paper base produced by adopting the wet paper making technology has high dry strength and proper air permeability. Because the pulp contains longer cotton pulp, low-melting-point chemical fiber and viscose fiber or tencel fiber, the pulp is more suitable for being made by an inclined wire paper machine and a wet paper machine, and some thicker paper-based materials can be produced by a multi-cylinder paper machine and a long wire paper machine with slower speed.
Because the beating degree of the sizing agent is not too high, the finished paper is loose, in order to adjust the air permeability of the paper base and enable the paper base to have higher moisture retention performance, the air permeability of the paper base needs to be properly adjusted by soaking the high molecular polymer with better hydrophilic water retention performance, and the invention selects at least one of carboxymethyl cellulose, glycerol and gelatin.
The invention has the advantages that: the super-thick humidifying and fresh-keeping composite module has a good humidifying and fresh-keeping effect, can maintain the average humidity in the fruit and vegetable box to be 90-95%, and reduces the dew formation amount in the fruit and vegetable box from about 2.0g to below 0.5g, so that the dew formation is greatly reduced, the risk of rot of fruits and vegetables due to dew formation is reduced, and the fruit and vegetable box is cleaner and more sanitary. In addition, no toxic and harmful waste water and gas is generated in the process of producing the thicker humidifying preservative paper base material, and the risk of residual chloride ions is avoided. The super-thick humidifying and refreshing composite module prepared according to the invention is used in a fruit and vegetable box with a refreshing function and a refrigerator with a refreshing fruit and vegetable box, can automatically adjust the moisture permeability according to the humidity change, has higher moisture absorption and water retention capacity due to hydrophilic fibers and more micropores when the humidity in the fruit and vegetable box is more than 95%, and can release the excess water vapor to the environment outside the refreshing box due to the concentration gradient of the water vapor when the water content of a paper-based material exceeds a certain amount, thereby effectively preventing the fruit and vegetable box from dewing and reducing the risk of fruit and vegetable decay; when the relative humidity in the fruit and vegetable box of the refrigerator is lower than 90%, the moisture absorbed in the humidifying and fresh-keeping composite module can be emitted out, so that the humidity in the fruit and vegetable box is maintained to be higher than 90%.
Detailed Description
The invention relates to an ultra-thick humidifying and fresh-keeping composite module which comprises an ultra-thick humidifying and fresh-keeping paper base layer and antibacterial and mildewproof non-woven fabrics compounded on the front surface and the back surface of the paper base layer.
The paper base layer adopts the raw materials of bleached sulfate softwood pulp, bleached sulfate hardwood pulp and bleached sulfite softwood pulp which are commonly used for papermaking, the content of hemicellulose of polysaccharides in the pulp is low, the long-term mildew phenomenon of the humidity-regulating preservative film used in a humid environment can be reduced, the raw material source is sufficient, and the strength performance and uniformity of the finished paper are good; in terms of water absorption performance, the water absorption performance of bleached hardwood pulp is slightly better than that of bleached softwood pulp; the tensile strength of bleached softwood pulp is better than that of bleached hardwood pulp in terms of finished paper strength. Cotton pulp, viscose fiber or tencel fiber with better water absorption and retention performance is also required to be added into the paper base; chemical fibers such as polyolefin SWP fibers or polypropylene fibers or polyester fibers which are easy to be subjected to ultrasonic heat bonding are also required to be added. Because the thickness of the paper base material is as high as 0.5-2.0mm, the pulp fiber is longer, and an inclined wire paper machine or a wet paper machine or a multi-cylinder paper machine or a fourdrinier paper machine is needed for paper making. Basis weight of paper base material 160-1000g/m2The thickness is 0.5-2.0mm, the longitudinal wet tensile strength is not less than 15N, and the Gurley air permeability is 5-20 s.
Because the humidifying and fresh-keeping composite module needs to be used in a humid environment for a long time, the paper-based material and the non-woven fabric need to have higher wet strength and a grade 0 mildew-proof grade.
The first embodiment is as follows: a paper base layer: 22% bleached sulfate softwood pulp, 70% cotton pulp, 8% SWP fiber, 20 DEG SR of softwood pulp beating degree, 25 DEG SR of cotton pulp beating degree, 3-4mm long SWP fiber, 1.0% PAE, 5% aluminum oxide and 0.5% oxine-copper; dipping solution: 3% carboxymethyl cellulose + 0.5% oxine-copper; paper making equipment: the fourdrinier paper machine has a paper base layer with the thickness of 0.5 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
Example two: a paper base layer: 52% bleached sulfate softwood pulp, 40% cotton pulp, 8% polypropylene fiber, 20 DEG SR of softwood pulp beating degree, 25 DEG SR of cotton pulp beating degree, 4-5mm long polypropylene fiber, 1.0% of PAE, 5% of aluminum oxide and 0.5% of oxine-copper; dipping solution: 3% gelatin + 0.8% oxine-copper; paper making equipment: the double-cylinder paper machine has a paper base layer with the thickness of 0.8 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
Example three: a paper base layer: 70% bleached sulfate softwood pulp, 20% tencel fiber, 8% SWP fiber, a softwood pulp beating degree of 20 DEG SR, a tencel fiber length of 4-5mm, an SWP fiber length of 3-4mm, 1.0% of PAE, 5% of zinc oxide and 0.5% of oxine-copper; dipping solution: 2% carboxymethyl cellulose + 0.5% oxine-copper; paper making equipment: the inclined wire paper machine, the thickness of the paper substrate layer is 0.8 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
Example four: a paper base layer: 70% of bleached sulfite softwood pulp, 20% of viscose fiber and 10% of polypropylene fiber, wherein the beating degree of the bleached sulfite softwood pulp is 25-degree SR, the length of the viscose fiber is 4-5mm, the length of the polypropylene fiber is 4-5mm, 1.0% of PAE, 5% of zinc oxide and 0.5% of thiabendazole; dipping solution: 3% gelatin + 0.8% thiabendazole; paper making equipment: the inclined wire paper machine, the thickness of the paper substrate layer is 1.0 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
Example five: a paper base layer: 45% bleached sulfite softwood pulp, 45% cotton pulp, 10% SWP fiber, 25 DEG SR of softwood pulp beating degree, 25 DEG SR of cotton pulp beating degree, 3-4mm long SWP fiber, 1.0% PAE, 5% aluminum oxide and 0.5% oxine-copper; dipping solution: 2% carboxymethyl cellulose + 0.5% oxine-copper; paper making equipment: the inclined wire paper machine, the thickness of the paper substrate layer is 1.0 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
Example six: a paper base layer: 20% of bleached sulfate softwood pulp, 20% of bleached sulfate hardwood pulp, 55% of cotton pulp, 10% of polyester fiber, 20 DEG SR of the beating degree of the softwood pulp, 25 DEG SR of the beating degree of the hardwood pulp, 25 DEG SR of the beating degree of the cotton pulp, 4-5mm long polyester fiber, 1.0% of PAE, 5% of aluminum oxide and 0.5% of thiabendazole; dipping solution: 2% glycerol + 0.5% thiabendazole; paper making equipment: the inclined wire paper machine, the thickness of the paper substrate layer is 1.2 mm. A non-woven fabric layer: antibacterial and mildewproof polyester non-woven fabric. The test results of the composite module are shown in table 1.
Example seven: a paper base layer: 20% bleached sulfate softwood pulp, 70% cotton pulp, 10% SWP fiber, 20 DEG SR of softwood pulp beating degree, 25 DEG SR of cotton pulp beating degree, 3-4mm long SWP fiber, 1.0% PAE, 5% zinc oxide and 1.0% oxine-copper; paper making equipment: the thickness of the paper base layer of the wet papermaking machine is 1.5 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
Example eight: a paper base layer: 30% bleached sulfite softwood pulp, 60% cotton pulp, 10% polypropylene fiber, 25 DEG SR of softwood pulp beating degree, 25 DEG SR of cotton pulp beating degree, 4-5mm long polypropylene fiber, 1.0% of PAE, 5% of alumina and 1.0% of thiabendazole; paper making equipment: the thickness of the paper base layer of the wet papermaking machine is 2.0 mm. A non-woven fabric layer: antibacterial and mildewproof polypropylene non-woven fabric. The test results of the composite module are shown in table 1.
The method for testing the relative humidity, the condensation amount and the water loss rate of the humidity load in the preservation box comprises the following steps: the prepared super-thick humidity-adjusting fresh-keeping composite module is installed on a top cover of a 12-liter refrigerator fruit and vegetable box with sealing performance, cellulose sponge which can uniformly adsorb 300g of distilled water is placed in the fruit and vegetable box to simulate humidity load, and a temperature and humidity instrument is placed at a proper position in the fruit and vegetable box. Placing the fruit and vegetable box loaded with the humidifying and fresh-keeping composite module in a refrigerating chamber of an air-cooled refrigerator for testing, and testing the average relative humidity in the fruit and vegetable box within 72 hours; after the measurement reaches 72 hours, the condensation amount of the four walls in the fruit and vegetable box is measured, and the water loss rate of the humidity load is weighed.
TABLE 1 comparison of test results with target values for the embodiments
As can be seen from table 1, the main physical performance indexes of the ultra-thick humidity-control fresh-keeping paper base manufactured by the above embodiments all meet the target value requirement, the fresh-keeping performance of the composite module formed by compounding the ultra-thick humidity-control fresh-keeping paper base and the non-woven fabric also meets the target value requirement, and under the condition of maintaining higher average humidity, the humidity load water loss rate is small and the dew condensation amount is very small, which indicates that the ultra-thick humidity-control fresh-keeping module developed by the invention can effectively reduce the dew condensation amount of the fruit and vegetable box, and achieve the purpose of high humidity preservation and fresh keeping.
Claims (4)
1. The utility model provides an ultra-thick type humidifying compound module that keeps fresh which characterized by: the core layer of the super-thick humidifying and refreshing composite module is a 0.5-2.0mm super-thick humidifying and refreshing paper base material, the front and back surfaces of the paper base material are bonded with antibacterial and mildewproof polypropylene fiber or terylene non-woven fabric by ultrasonic point hot bonding to form an ultra-thick humidifying and fresh-keeping composite module, wherein, the manufacturing method of the super-thick humidity-regulating fresh-keeping paper base material comprises the steps of pulping and making by adopting 25-70% of bleached chemical wood pulp, 20-70% of high water absorption fiber and 5-10% of low melting point chemical fiber according to the raw material parts, in the paper making process, PAE (polyamide acid) with the relative absolute dry fiber amount of 1.0%, antibacterial mildew preventive with the relative absolute dry fiber amount of 0.5-1.0% and moisture absorption fluffer with the relative absolute dry fiber amount of 5% are added into pulp to prepare base paper, the base paper is soaked in a mixed solution of a hydrophilic water-retaining high-molecular polymer and the antibacterial mildew preventive, and an inclined wire paper machine or a wet paper machine is adopted to make the base material of the super-thick humidity-regulating preservative paper.
2. The ultra-thick humidity-conditioning and freshness-retaining compound module as claimed in claim 1, wherein: the bleached chemical wood pulp is at least one of bleached sulfate wood pulp and bleached sulfite wood pulp, and the beating degree is 20-25 DEG SR; the high water absorption fiber is at least one of cotton pulp, viscose fiber and tencel fiber; the moisture absorption swelling agent is zinc oxide or aluminum oxide; the hydrophilic water-retaining high molecular polymer is at least one of carboxymethyl cellulose, glycerol and gelatin.
3. A method for manufacturing the ultra-thick humidity-conditioning and freshness-retaining composite module as claimed in claim 1 or 2, wherein: the paper making method of the wet paper making machine comprises the steps of curling wet paper sheets on a large cylinder in a multi-layer mode, cutting the wet paper sheets by a high-pressure water gun to form flat wet paper sheets, extruding the flat wet paper sheets by a large flat press to remove excessive moisture, and drying the flat wet paper sheets by a hot air dryer to obtain the ultra-thick humidity-regulating preservative paper base material.
4. The application of the ultra-thick humidity-conditioning and freshness-retaining composite module as claimed in claim 1 or 2, is characterized in that: the super-thick humidifying and fresh-keeping composite module is assembled on a fruit and vegetable box, so that the relative humidity of 3 balances in the fruit and vegetable box is not less than 90%, the water loss rate of fruits and vegetables is not more than 5%, and the dewing amount of the fruit and vegetable box is not more than 0.5 g.
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| CN109371733B (en) * | 2018-12-18 | 2020-08-04 | 山东凯丽特种纸股份有限公司 | Hot-stamping color-changing colored paper and production method thereof |
| CN110331623B (en) * | 2019-07-10 | 2021-07-27 | 万邦特种材料股份有限公司 | Waterproof fresh-keeping composite paper and preparation method thereof |
| CN111937957B (en) * | 2020-07-31 | 2023-09-26 | 中华全国供销合作总社济南果品研究院 | Apple cold-storage moisturizing transportation preservative film and preparation method thereof |
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