CN112342839A - Trace coating food packaging paper and preparation method thereof - Google Patents
Trace coating food packaging paper and preparation method thereof Download PDFInfo
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- CN112342839A CN112342839A CN202011251286.2A CN202011251286A CN112342839A CN 112342839 A CN112342839 A CN 112342839A CN 202011251286 A CN202011251286 A CN 202011251286A CN 112342839 A CN112342839 A CN 112342839A
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- wood pulp
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- food packaging
- chitosan
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- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 238000000576 coating method Methods 0.000 title claims abstract description 60
- 235000013305 food Nutrition 0.000 title claims abstract description 54
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 78
- 239000000835 fiber Substances 0.000 claims abstract description 51
- 229920001661 Chitosan Polymers 0.000 claims abstract description 43
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000004408 titanium dioxide Substances 0.000 claims description 8
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- 125000002091 cationic group Chemical group 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 4
- 230000006196 deacetylation Effects 0.000 claims description 3
- 238000003381 deacetylation reaction Methods 0.000 claims description 3
- 239000011121 hardwood Substances 0.000 claims description 3
- QCFYJCYNJLBDRT-UHFFFAOYSA-N Bis(2-chloro-1-methylethyl)ether Chemical group ClCC(C)OC(C)CCl QCFYJCYNJLBDRT-UHFFFAOYSA-N 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 2
- UGTZMIPZNRIWHX-UHFFFAOYSA-K sodium trimetaphosphate Chemical compound [Na+].[Na+].[Na+].[O-]P1(=O)OP([O-])(=O)OP([O-])(=O)O1 UGTZMIPZNRIWHX-UHFFFAOYSA-K 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 13
- 230000004888 barrier function Effects 0.000 abstract description 10
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 4
- 239000005003 food packaging material Substances 0.000 abstract description 3
- 230000036541 health Effects 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000007888 film coating Substances 0.000 abstract description 2
- 238000009501 film coating Methods 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000004018 waxing Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 239000004519 grease Substances 0.000 description 12
- 230000035515 penetration Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003925 fat Substances 0.000 description 4
- 150000002632 lipids Chemical class 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 235000021485 packed food Nutrition 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229920002101 Chitin Polymers 0.000 description 1
- 240000001624 Espostoa lanata Species 0.000 description 1
- 235000009161 Espostoa lanata Nutrition 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000015895 biscuits Nutrition 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 235000021268 hot food Nutrition 0.000 description 1
- 235000015243 ice cream Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Classifications
-
- 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
- D21H27/10—Packing paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
Landscapes
- Paper (AREA)
Abstract
The invention discloses trace coating food packaging paper and a preparation method thereof, belonging to the technical field of food paper processing, wherein the preparation method comprises the following steps: mixing and stirring short fiber wood pulp, long fiber wood pulp, an auxiliary agent and a filler uniformly to prepare mixed wood pulp, papermaking by using a wet paper sheet of the mixed wood pulp, and primarily drying; coating the dried paper, and drying for the second time after coating to obtain trace coated food packaging paper; the preparation method of the coating liquid comprises the following steps: dissolving chitosan in an acetic acid solution, adding a cross-linking agent, heating to 50-60 ℃, and reacting for 30-50 min. The food packaging paper prepared by the invention can solve the problems of poor oil resistance and barrier property and poor mechanical property of a paper-based food packaging material, enhances the antibacterial capability, prolongs the shelf life of food, avoids traditional waxing and film coating, ensures the safety and health of food, obviously improves the retention rate of the filler through surface coating, and simultaneously does not generate the phenomena of hair and powder falling.
Description
Technical Field
The invention belongs to the technical field of paper processing for food, and particularly relates to trace coating food packaging paper and a manufacturing method thereof.
Background
With the development of food industry, the variety of food packaging paper is increasing, and common food packaging paper and sugar are cake paper and sugar
Fruit paper, facial tissue hanging box, bread paper, biscuit paper box and ice cream external packing paper. It must satisfy a number of different and partially contradictory requirements: firstly, the food is ensured not to be influenced by environment, namely certain mechanical strength and chemical stability aiming at typical environmental influence are required; secondly, protecting the environment from the packaged food with which it may come into contact, for which there is a need for sufficient resistance to the penetration of grease, oil and water through the wrapper, for which there is a defined resistance to the penetration of water vapour, preventing the food from drying too quickly, and for which there is a need for hot food to prevent water vapour from condensing inside the package and making the food moist; good printability of at least one side is ensured because many food wrapping papers are printed to be able to identify the packaged food product and its source and to provide an attractive appearance to the packaged food product. In addition, since the food wrap is usually used only once, for ecological reasons the wrap should be as easily recyclable as possible, or at least be guaranteed to be biodegradable.
The food packaging paper mainly comprises fibers, so that the oil resistance and the barrier property are poor when the food packaging paper is directly used for packaging oil-containing food. The preparation of the grease-resistant paper mainly comprises two methods, one method is to promote the sheepskin formation of the finished paper by improving the beating degree of the paper pulp, but the improvement of the beating degree has higher energy consumption, paper defects are easy to generate after drying, and the flatness of the paper is poor, so the method is not feasible in actual production. The other method is to add an oil-resistant agent into the pulp or coat an oil-resistant coating on the surface of the paper for matching by using a sizing method, carry out vacuum aluminizing on the surface of the paper base, and coat or coat polymers containing fluorine and the like to improve the oil-resistant performance and the barrier performance.
The cationic starch is a common sizing agent for the surface coating of the paper base, and can improve the surface strength of the paper base; however, the paper base prepared by the method has loose surface and poor grease resistance, and the grease resistance requirement of food packaging paper is difficult to meet. Chitosan is a deacetylated product of chitin and has a wide source in nature. The chitosan has cationic amino, compact molecular chain arrangement, high crystallinity, good antibacterial property, good barrier property and good grease resistance, and is very suitable for food packaging. However, the molecular weight (20-60 ten thousand) of the chitosan is small, so that the difference between the mechanical property and the traditional paper-plastic material is large when the chitosan is directly used, and the use range is greatly limited; the barrier property of water vapor and oxygen is general, and the shelf life of the food is reduced.
In conclusion, the development of the food packaging paper which has good oil resistance and barrier property, good mechanical property, excellent printability and environmental friendliness is of great significance.
Disclosure of Invention
Aiming at the problem of poor oil resistance and barrier property and mechanical property of a paper-based food packaging material in the prior art, the invention provides trace coating food packaging paper and a manufacturing method thereof.
The invention is realized by the following technical scheme:
a manufacturing method of trace coating food wrapping paper comprises the following steps:
(1) mixing and stirring short-fiber wood pulp, long-fiber wood pulp, an auxiliary agent and a filler uniformly to prepare mixed wood pulp;
(2) making the mixed wood pulp in the step (1) into a wet paper sheet, and then primarily drying the mixed wood pulp after making;
(3) micro-coating: coating the paper after primary drying, and drying for the second time after coating to obtain trace coated food packaging paper;
the preparation method of the coating liquid for coating in the step (3) comprises the following steps: dissolving chitosan in an acetic acid solution, adding a cross-linking agent, heating to 50-60 ℃, and reacting for 30-50 min.
Further, the mass concentration of the chitosan in the acetic acid solution is 0.3-0.5%; the addition amount of the cross-linking agent is 5-8% of the mass of the chitosan.
Further, the deacetylation degree of the chitosan is 80-90%.
Further, the short-staple wood pulp is hardwood pulp; the long fiber wood pulp is coniferous fiber wood pulp; the auxiliary agent is cationic starch and/or chitosan; the filler is more than one of talcum powder, titanium dioxide and calcium carbonate; the cross-linking agent is more than one of sodium trimetaphosphate, phosphorus oxychloride, ethanediol dianhydride and chloromonopropylene oxide ring.
Further, the oven-dried mass of the long-fiber wood pulp in the step (1) is 20-40% of the oven-dried mass of the short-fiber wood pulp; the addition amount of the auxiliary agent is 6-8% of the dry amount of the wood pulp; the adding amount of the filler is 15-25% of the dry amount of the wood pulp.
Further, the mass concentration of the short-staple wood pulp in the step (1) is 6-8%; the mass concentration of the long fiber wood pulp is 3-5%.
Further, the water content of the paper sheet after primary drying in the step (2) is 15-20 wt%
Further, the coating conditions in step (3) are, transmission side/operation side: 16-24/16-24kN/m, metering rod pressure: upper/lower rolls: 0.6-1.2/0.6-1.2bar, coating weight: 2-4g/m2。
Further, the moisture content of the trace coating food packaging paper in the step (3) is 6-8%.
In the invention, the trace coating food packaging paper obtained by the preparation method is provided.
In the invention, the positive charge of the amino group in the chitosan under the acidic condition is combined with the negative charge of the fat or the lipid, so that the transfer of the fat or the lipid can be prevented, a transparent film is formed on the surface of the paper, the paper has good grease resistance and barrier property, has strong oil-proof and water-proof properties, can prevent oil and water on food from seeping out, is convenient for consumers to eat, the crosslinked chitosan is coated on the surface of the paper, has the characteristics of transparency and colorlessness, strong infiltration and good adhesive force, after coating, the food packaging paper can still keep texture and color, can improve the tensile strength, folding resistance, aging resistance, mildew resistance, bacteria resistance and the like of the paper, can play a role in fixing the handwriting ink, can not influence the color of the handwriting, can inhibit the penetration of the grease and water by spraying the chitosan on the surface of the packaging paper, can enhance the antibacterial capability, can prolong the shelf life of the food, and can avoid the traditional, ensuring the safety and health of food.
Advantageous effects
(1) The food packaging paper provided by the invention can solve the problems of poor oil resistance and barrier property and poor mechanical property of a paper-based food packaging material, can inhibit the penetration of grease and moisture, enhances the antibacterial capability, prolongs the shelf life of food, avoids the traditional waxing and film coating, and ensures the safety and health of the food;
(2) by adopting the method, the chitosan crosslinking component forms a film on the surface of the paper base and permeates into the paper base, so that the bonding force between fibers is increased, the retention rate of the filler can be obviously improved under the action of surface coating, the phenomena of hair and powder falling are avoided, and the crosslinked chitosan is attached to the packaging paper to avoid falling and powder falling.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
The hardwood fiber pulp used in the embodiment of the invention is imported eucalyptus pulp, and the softwood fiber pulp is pine wood pulp.
The degree of deacetylation of the chitosan used in the examples of the present invention was 85%.
Example 1
(1) The preparation method of the coating liquid comprises the following steps: dissolving chitosan in acetic acid solution, wherein the mass concentration of the dissolved chitosan is 0.4%, then adding dianhydride which is 6% of the mass of the chitosan and serves as a cross-linking agent, heating to 55 ℃, and reacting for 40min to obtain a coating liquid;
(2) the composite wood pulp is prepared by uniformly mixing and stirring short-fiber wood pulp, long-fiber wood pulp, chitosan and titanium dioxide, wherein the oven-dried mass of the long-fiber wood pulp is 30% of that of the short-fiber wood pulp, the mass concentration of the long-fiber wood pulp is 5%, and the mass concentration of the short-fiber wood pulp is 7%; the addition amount of the chitosan is 7 percent of the dry amount of the wood pulp; the addition amount of the titanium dioxide is 20 percent of the dry amount of the wood pulp;
(3) making the mixed pulp obtained in the step (1) into a wet paper sheet, and primarily drying the wet paper sheet after making, wherein the water content of the dried paper sheet is 18 wt%;
(4) micro-coating: the paper after the previous drying was subjected to a coating operation under the conditions of transmission side/operation side: 20/20kN/m, metering rod pressure: upper/lower rolls: 1.0/10bar, coating weight: 3g/m2(ii) a After coating, carrying out secondary drying to obtain trace coating food packaging paper, wherein the moisture content of the food packaging paper is 6%;
example 2
(1) The preparation method of the coating liquid comprises the following steps: dissolving chitosan in acetic acid solution, wherein the mass concentration of the dissolved chitosan is 0.5%, then adding phosphorus oxychloride with the mass of 8% of that of the chitosan as a cross-linking agent, heating to 60 ℃, and reacting for 30min to obtain a coating liquid;
(2) mixing and stirring short-fiber wood pulp, long-fiber wood pulp, cationic starch and talcum powder uniformly to obtain mixed wood pulp, wherein the oven-dried mass of the long-fiber wood pulp is 40% of the oven-dried mass of the short-fiber wood pulp, the mass concentration of the long-fiber wood pulp is 5%, and the mass concentration of the short-fiber wood pulp is 6%; the adding amount of the cationic starch is 6 percent of the dry amount of the wood pulp; the addition amount of the talcum powder is 25 percent of the dry amount of the wood pulp; (ii) a
(3) Making the mixed pulp obtained in the step (1) into a wet paper sheet, and primarily drying the wet paper sheet after making, wherein the water content of the dried paper sheet is 20 wt%;
(4) micro-coating: the paper after the previous drying was subjected to a coating operation under the conditions of transmission side/operation side: 20/20kN/m, metering rod pressure: upper/lower rolls: 1.0/10bar, coating weight: 3g/m2(ii) a After coating, carrying out secondary drying to obtain trace coating food packaging paper, wherein the moisture content of the food packaging paper is 8%;
example 3
(1) The preparation method of the coating liquid comprises the following steps: dissolving chitosan in acetic acid solution, wherein the mass concentration of the dissolved chitosan is 0.3%, then adding dianhydride which accounts for 5% of the mass of the chitosan and serves as a cross-linking agent, heating to 50 ℃, and reacting for 50min to obtain a coating liquid;
(2) the production method comprises the following steps of (1) uniformly mixing and stirring short-fiber wood pulp, long-fiber wood pulp, chitosan and calcium carbonate to obtain mixed wood pulp, wherein the oven-dried mass of the long-fiber wood pulp is 20% of the oven-dried mass of the short-fiber wood pulp, the mass concentration of the long-fiber wood pulp is 3%, and the mass concentration of the short-fiber wood pulp is 8%; the addition amount of the chitosan is 8 percent of the dry amount of the wood pulp; the addition amount of the calcium carbonate is 15 percent of the dry amount of the wood pulp; (ii) a
(3) Making the mixed pulp obtained in the step (1) into a wet paper sheet, and primarily drying the wet paper sheet after making, wherein the water content of the dried paper sheet is 15 wt%;
(4) micro-coating: the paper after the previous drying was subjected to a coating operation under the conditions of transmission side/operation side: 20/20kN/m, metering rod pressure: upper/lower rolls: 1.0/10bar, coating weight: 3g/m2(ii) a After coating, carrying out secondary drying to obtain trace coating food packaging paper, wherein the moisture content of the food packaging paper is 6%;
comparative example 1
(1) The composite wood pulp is prepared by uniformly mixing and stirring short-fiber wood pulp, long-fiber wood pulp, chitosan and titanium dioxide, wherein the oven-dried mass of the long-fiber wood pulp is 30% of that of the short-fiber wood pulp, the mass concentration of the long-fiber wood pulp is 5%, and the mass concentration of the short-fiber wood pulp is 7%; the addition amount of the chitosan is 7 percent of the dry amount of the wood pulp; the addition amount of the titanium dioxide is 20 percent of the dry amount of the wood pulp;
(2) making the mixed pulp obtained in the step (1) into wet paper pages, and drying the wet paper pages to obtain the food packaging paper with the water content of 6%;
comparative example 2
(1) The preparation method of the coating liquid comprises the following steps: dissolving chitosan in an acetic acid solution to be used as a coating liquid, wherein the mass concentration of the dissolved chitosan is 0.4%;
(2) the composite wood pulp is prepared by uniformly mixing and stirring short-fiber wood pulp, long-fiber wood pulp, chitosan and titanium dioxide, wherein the oven-dried mass of the long-fiber wood pulp is 30% of that of the short-fiber wood pulp, the mass concentration of the long-fiber wood pulp is 5%, and the mass concentration of the short-fiber wood pulp is 7%; the addition amount of the chitosan is 7 percent of the dry amount of the wood pulp; the addition amount of the titanium dioxide is 20 percent of the dry amount of the wood pulp;
(3) making the mixed pulp obtained in the step (1) into a wet paper sheet, and primarily drying the wet paper sheet after making, wherein the water content of the dried paper sheet is 18 wt%;
(4) micro-coating: the paper after the previous drying was subjected to a coating operation under the conditions of transmission side/operation side: 20/20kN/m, metering rod pressure: upper/lower rolls: 1.0/10bar, coating weight: 3g/m2(ii) a After coating, carrying out secondary drying to obtain trace coating food packaging paper, wherein the moisture content of the food packaging paper is 6%;
testing the performance of the food packaging paper:
experimental methods
(1) The oil drop test is adopted to determine the grease resistance of the paper: dropping the liquid from the height of 2.54cm onto the paper to be tested, and checking the group which does not pollute the paper (wiping with a cotton ball, and the sample is not obviously darkened) and has the highest number after 15s, namely representing the grease resistance value of the paper to be tested; (8-12)
(2) Determination of water vapor transmission rate (MVP): taking a high-type weighing bottle filled with about 3g of anhydrous calcium chloride, covering a paper sample slightly larger than the bottle opening on the bottle opening, sealing the edge of the bottle, placing the bottle in a constant humidity dryer with the relative humidity of 65%, and weighing the bottle once every 2-4 h by using an analytical balance to determine the water absorption of the anhydrous calcium chloride, wherein the water absorption is accurate to 0.0001 g;
MVP=△W·X/[A·T·(P 1-P 2)]
Δ W-weight gain of the weighing bottle, g;
x is the thickness of the paper, mm;
a-area of paper, mm2；
T-time interval, h;
P1-P2-partial pressure difference of water vapor inside and outside the membrane, Kpa.
(3) And testing the tensile strength of the paper to be tested by adopting a ZLD-300 type electronic paper tensile testing machine.
Test results
The grease resistance, water vapor transmission rate and tensile strength of the paper of the food wrap papers prepared in examples 1 to 3 of the present invention, comparative examples 1 and 2 are shown in the following table 1:
TABLE 1 Properties of wrapping paper for food prepared in examples and comparative examples
As can be seen from Table 1, the positive charges of the amino groups in the chitosan under acidic conditions are combined with the negative charges of the fats or lipids to prevent the transfer of the fats or lipids, and the chitosan is crosslinked with a crosslinking agent, so that the chitosan has good grease resistance and barrier property, has strong oil-proof and water-proof properties, avoids oil and water exudation on food, is convenient for consumers to eat, can be coated on the surface of paper, has strong infiltration and penetration and good adhesive force, can improve the tensile strength, folding strength, aging resistance, mildew resistance, bacteria resistance and other properties of the paper after coating, and can play a role in fixing colors of the handwriting ink, so that the color and luster of the handwriting are not affected.
Claims (10)
1. The manufacturing method of the trace coating food packaging paper is characterized by comprising the following steps:
(1) mixing and stirring short-fiber wood pulp, long-fiber wood pulp, an auxiliary agent and a filler uniformly to prepare mixed wood pulp;
(2) making the mixed wood pulp in the step (1) into a wet paper sheet, and then primarily drying the mixed wood pulp after making;
(3) micro-coating: coating the paper after primary drying, and drying for the second time after coating to obtain trace coated food packaging paper;
the preparation method of the coating liquid for coating in the step (3) comprises the following steps: dissolving chitosan in an acetic acid solution, adding a cross-linking agent, heating to 50-60 ℃, and reacting for 30-50 min.
2. The method according to claim 1, wherein the chitosan is present in an acetic acid solution at a mass concentration of 0.3 to 0.5%; the addition amount of the cross-linking agent is 5-8% of the mass of the chitosan.
3. The method according to claim 1, wherein the degree of deacetylation of chitosan is 80 to 90%.
4. The method of claim 1 wherein said staple fiber pulp is a hardwood pulp; the long fiber wood pulp is coniferous fiber wood pulp; the auxiliary agent is cationic starch and/or chitosan; the filler is more than one of talcum powder, titanium dioxide and calcium carbonate; the cross-linking agent is more than one of sodium trimetaphosphate, phosphorus oxychloride, ethanediol dianhydride and chloromonopropylene oxide ring.
5. The manufacturing method of claim 1, wherein the absolute dry mass of the long-fiber wood pulp in the step (1) is 20-40% of the absolute dry mass of the short-fiber wood pulp; the addition amount of the auxiliary agent is 6-8% of the dry amount of the wood pulp; the adding amount of the filler is 15-25% of the dry amount of the wood pulp.
6. The manufacturing method of claim 1, wherein the mass concentration of the short-staple wood pulp in the step (1) is 6-8%; the mass concentration of the long fiber wood pulp is 3-5%.
7. The method of claim 1, wherein the moisture content of the sheet after the preliminary drying in step (2) is 15-20 wt%.
8. The production method according to claim 1, wherein the coating conditions in the step (3) are, transmission side/operation side: 16-24/16-24kN/m, metering rod pressure: upper/lower rolls: 0.6-1.2/0.6-1.2bar, coating weight: 2-4g/m2。
9. The manufacturing method according to claim 1, wherein the moisture content of the trace amount of coated food packaging paper in the step (3) is 6-8%.
10. A trace amount coated food packaging paper obtained by the production method according to any one of claims 1 to 9.
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