CN117947652A - Paper, preparation method thereof and application thereof in drug instruction book - Google Patents
Paper, preparation method thereof and application thereof in drug instruction book Download PDFInfo
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- CN117947652A CN117947652A CN202410060672.5A CN202410060672A CN117947652A CN 117947652 A CN117947652 A CN 117947652A CN 202410060672 A CN202410060672 A CN 202410060672A CN 117947652 A CN117947652 A CN 117947652A
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- 239000003814 drug Substances 0.000 title abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 229940079593 drug Drugs 0.000 title description 4
- 239000002002 slurry Substances 0.000 claims abstract description 88
- 239000000945 filler Substances 0.000 claims abstract description 54
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 42
- 230000014759 maintenance of location Effects 0.000 claims abstract description 31
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 31
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 21
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 14
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 14
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 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 abstract description 8
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 8
- 238000004513 sizing Methods 0.000 claims description 31
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 23
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 23
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 16
- 229920000881 Modified starch Polymers 0.000 claims description 15
- 239000004368 Modified starch Substances 0.000 claims description 15
- 235000019426 modified starch Nutrition 0.000 claims description 15
- 239000011122 softwood Substances 0.000 claims description 14
- 230000018044 dehydration Effects 0.000 claims description 13
- 238000006297 dehydration reaction Methods 0.000 claims description 13
- 239000011121 hardwood Substances 0.000 claims description 12
- 238000003490 calendering Methods 0.000 claims description 9
- 239000011265 semifinished product Substances 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 2
- 208000005156 Dehydration Diseases 0.000 claims 3
- 239000000825 pharmaceutical preparation Substances 0.000 claims 1
- 229940127557 pharmaceutical product Drugs 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract 1
- 125000002091 cationic group Chemical group 0.000 description 18
- 229920002472 Starch Polymers 0.000 description 12
- 239000008107 starch Substances 0.000 description 12
- 235000019698 starch Nutrition 0.000 description 12
- 239000001254 oxidized starch Substances 0.000 description 11
- 235000013808 oxidized starch Nutrition 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- -1 alkyl ketene dimer Chemical compound 0.000 description 7
- 238000010009 beating Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000001913 cellulose Substances 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229920002401 polyacrylamide Polymers 0.000 description 6
- 238000004537 pulping Methods 0.000 description 6
- 238000012216 screening Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229920006320 anionic starch Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-IGMARMGPSA-N Calcium-40 Chemical group [40Ca] OYPRJOBELJOOCE-IGMARMGPSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
Abstract
The invention discloses paper, a preparation method thereof and application thereof in a medicine specification, and relates to the technical field of medicine specifications, so as to solve the defect of low surface strength of the paper. Wherein, the basis weight of the paper is 40g/m 2～46g/m2, the opacity of the paper is 72% -78%, the surface strength of the paper is 1.5 m/s-2.0 m/s, and the preparation method of the paper comprises the following steps: and adding filler, reinforcing agent and retention aid into the papermaking slurry to obtain the pretreated slurry. And manufacturing paper from the pretreated slurry, wherein the paper comprises 0.3 to 1.0 part by weight of reinforcing agent, 0.02 to 0.025 part by weight of retention aid, 15.0 to 20.0 parts by weight of filler, the filler comprises 70 to 80 parts by weight of calcium carbonate and 20 to 30 parts by weight of advanced filler, and the advanced filler comprises at least one of titanium dioxide, talcum powder, diatomite and kaolin. The paper disclosed by the invention, a preparation method thereof and application thereof in medicine specification are used for preparing medicine specification paper.
Description
Technical Field
The invention relates to the technical field of medicine specifications, in particular to paper, a preparation method thereof and application thereof in the medicine specifications.
Background
The paper for the medicine instruction book belongs to a printing product, the paper for the medicine instruction book in the current price section is mainly low-quantitative double-adhesive paper, the gram weight is generally 55g/m 2～60g/m2, the printing process requirement is low, the opacity of the paper is low, the paper for the foreign medicine instruction book is required to be low in gram weight, the paper sheet is thin, the printing is easy to cause strike-through, meanwhile, the printed bar code is easy to fall off powder, and the daily use requirement of the foreign medicine instruction book cannot be met.
The problem is solved at the present stage, the aim of improving the opacity of the paper is often achieved by improving the total proportion of the filler to the raw materials, however, the surface strength of the paper prepared by the method is lower, and the daily use requirements of foreign medicine specifications can not be met.
Disclosure of Invention
The invention aims to provide paper, a preparation method thereof and application thereof in medicine specifications, so that the paper has better opacity and the surface strength of the paper is improved.
In order to achieve the above object, the present invention provides a method for producing a sheet having a basis weight of 40g/m 2～46g/m2, an opacity of 72% to 78%, and a surface strength of 1.5m/s to 2.0m/s, comprising: adding filler, reinforcing agent and retention aid into papermaking slurry to obtain pretreated slurry;
The pretreatment slurry is manufactured into paper, wherein the paper comprises 0.3 to 1.0 part by mass of reinforcing agent, the paper comprises 0.02 to 0.025 part by mass of retention aid, and the filler comprises 15.0 to 20.0 parts by mass; the filler comprises 70-80 parts by weight of calcium carbonate and 20-30 parts by weight of advanced filler, wherein the advanced filler comprises at least one of titanium dioxide, talcum powder, diatomite and kaolin.
Compared with the prior art, in the preparation method of the paper provided by the invention, the filler, the reinforcing agent and the retention aid are added into the papermaking slurry to obtain the pretreatment slurry, and then the pretreatment slurry is manufactured into the paper. The surface of cellulose molecules of the papermaking slurry is provided with more hydroxyl groups, and the reinforcing agent contains more hydrogen bond forming groups, so that after 0.3-1.0 parts by weight of reinforcing agent is added into the papermaking slurry, the reinforcing agent can perform chemical hydration with cellulose molecules, promote the hydrogen bond forming groups contained in the reinforcing agent to form hydrogen bond combination with cellulose molecules of the papermaking slurry, strengthen the bonding force among fibers, and facilitate the improvement of the flexibility of the prepared paper, so that the paper has higher folding endurance. Meanwhile, the reinforcing agent provided by the invention can also play a role of a dispersing agent, so that fiber molecules in the pretreated slurry are dispersed more uniformly, bonding sites among fibers are increased, the retention rate of fine fibers is improved, and the surface strength of the prepared paper is improved. The filler used in the invention comprises 70-80 parts by weight of calcium carbonate and 20-30 parts by weight of advanced filler, wherein the advanced filler comprises at least one of titanium dioxide, talcum powder, diatomite and kaolin, and under the above proportion, the filler is beneficial to improving the paper performance and the opacity of paper. In addition, the retention aid provided by the invention is an organic high polymer with a water-soluble branched chain structure, and after 0.02-0.025 parts of reinforcing agent and 15.0-20.0 parts of filler are added into papermaking slurry, the retention rate of the paper pulp in the preparation process can be increased, and the retention aid has excellent retention effect on fine fibers and the filler, so that the surface strength of the paper is further improved while the prepared paper has better opacity.
According to experiments, under the combined action of 0.3-1.0 part of reinforcing agent and 0.02-0.025 part of retention aid, 15.0-20.0 parts of filler, the prepared paper has a quantitative weight of 40g/m 2～46g/m2, an opacity of 72-78% and a surface strength of 1.5-2.0 m/s, so that the paper has better opacity, the surface strength is improved, and the probability of powder dropping of a printed bar code caused by low surface strength of the paper is reduced.
In a second aspect, the invention also provides a paper comprising paper fibres, reinforcing agents, retention aids and fillers, the basis weight of the paper being 40g/m 2～46g/m2, the opacity of the paper being 72% to 78%, the surface strength of the paper being 1.5m/s to 2.0m/s;
The paper comprises 0.3 to 0.5 part by weight of reinforcing agent, 0.02 to 0.025 part by weight of retention aid and 15.0 to 20.0 parts by weight of filler.
In a third aspect, the invention also provides an application of the paper in the specification of medicines.
Compared with the prior art, the beneficial effects of the paper and the application of the paper in the drug specification are the same as those of the paper preparation method, and the description is omitted here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
Fig. 1 shows a flowchart of a method of producing paper provided in this embodiment.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure.
In the present invention, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In the present invention, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, wherein a, b, c can be single or multiple.
At present, the aim of improving the opacity of the paper is often achieved by improving the total proportion of the filler to the raw materials, however, the surface strength of the paper prepared by the method is lower, the printed bar code is easy to fall off powder, and the daily use requirement of the specification still cannot be met.
In view of the above problems, embodiments of the present invention provide a method for manufacturing paper, which improves the surface strength of the paper while making the paper have better opacity. Fig. 1 shows a flowchart of a method of producing paper provided in this embodiment. As shown in fig. 1, the paper preparation method includes:
step 101: and adding filler, reinforcing agent and retention aid into the papermaking slurry to obtain the pretreated slurry.
Illustratively, chemical softwood pulp and hardwood pulp are disintegrated, deslagged, and ground to mix to obtain a papermaking slurry. The mass portion of the chemical softwood pulp is limited to 15-25 portions, and the mass portion of the hardwood pulp is limited to 75-85 portions, so that the strength of the prepared paper is improved. When the mass fraction of the chemical softwood pulp is lower than 15 parts, the surface strength of the prepared paper is affected, and the flexibility of the paper is reduced, so that the folding endurance of the paper is reduced. When the mass fraction of the chemical softwood pulp is higher than 25 parts, the consumed production cost is higher, and the surface strength of the prepared paper cannot be obviously improved. The breaking concentration of the papermaking slurry in the embodiment of the invention is 5.0-6.0%, so that the breaking concentration of the pretreated slurry is improved, and the chemical reaction in the pretreated slurry can be enhanced to form stable vortex. Meanwhile, the beating degree of the papermaking slurry in the embodiment of the invention is 50-60 DEG SR, and in the range, the binding force among fibers is increased along with the increase of the beating degree, so that the paper with higher surface strength is prepared.
In practical applications, if the paper made has broke, the broke may be disintegrated and concentrated to obtain broke. Subsequently, it is added to the papermaking slurry to obtain a pretreated slurry. In the process, the breaking concentration of the damaged pulp in the embodiment of the invention is 2.0-3.0%, so that the breaking concentration of the pretreated pulp is improved, and the chemical reaction in the pretreated pulp can be enhanced to form stable vortex. Meanwhile, the beating degree of the damaged pulp is 50-60 DEG SR, and the beating degree of the damaged pulp is similar to that of the pretreated pulp, so that the bonding force among fibers of the damaged pulp can be matched with the bonding force among fibers of the papermaking pulp containing chemical softwood pulp and hardwood pulp, and paper with higher surface strength can be prepared under the combined action of the bonding forces.
Illustratively, the reinforcing agent provided by the embodiment of the application comprises at least one of cationic starch, carboxymethyl cellulose and polyvinyl alcohol. The surface of cellulose molecules of the papermaking slurry is provided with more hydroxyl groups, and the reinforcing agent contains more hydrogen bond forming groups, so that the reinforcing agent is added into the papermaking slurry, and after the mass part of the reinforcing agent is limited to be 0.3-1.0 part, the reinforcing agent can perform chemical hydration with the cellulose molecules, so that the hydrogen bond forming groups contained in the reinforcing agent and the cellulose molecules of the papermaking slurry form hydrogen bond combination, the bonding force among fibers is enhanced, the flexibility of the prepared paper is improved, and the paper has higher folding endurance. Meanwhile, the reinforcing agent provided by the application can also play a role of a dispersing agent, so that fiber molecules in the pretreated slurry are dispersed more uniformly, bonding sites among fibers are increased, the retention rate of fine fibers is improved, and the surface strength of the prepared paper is improved.
The retention aid provided by the embodiment of the invention is an organic high polymer with a water-soluble branched chain structure, can overcome the contradiction between flocculation, retention and paper formation uniformity more effectively, and is particularly suitable for large-scale high-speed and net-clamping paper machines. Specifically, the retention aid comprises at least one of cationic polyacrylamide, cationic starch, an acrylamide grafted copolymer and an acrylamide-sodium acrylate copolymer. The filler provided by the embodiment of the invention comprises at least one of calcium carbonate and a high-grade filler, and the filler is added into the papermaking slurry to ensure that the prepared paper has a certain opacity. Specifically, the filler comprises 70-80 parts by weight of calcium carbonate and 20-30 parts by weight of advanced filler, wherein the advanced filler comprises at least one of titanium dioxide, talcum powder, diatomite and kaolin, and under the proportion, the paper performance and the opacity of the paper are improved.
In the process, after 0.02-0.025 parts of retention aid and 15.0-20.0 parts of filler are added into the papermaking slurry, the retention rate of the paper pulp in the preparation process can be increased, and the retention effect on fine fibers and the filler is excellent, so that the surface strength of the paper is further improved while the prepared paper has better opacity.
It is understood that, in order to make paper have a certain water-resistant property, it is not easy to be infiltrated by water or an aqueous solution to a certain extent, 1.2 to 2.0 parts by mass of an internal sizing agent may be added to the papermaking slurry, and specifically, at least one of an alkyl ketene dimer, alkenyl succinic anhydride and cationic acrylate may be selected.
For this, in order to prepare the pretreated pulp, chemical softwood pulp and hardwood pulp are first disintegrated by a water conservancy pulper, poured into a discharge pulp tank after the disintegration, and deslagged by a deslagging device. Along with the deslagging, the papermaking slurry is poured into a pre-grinding pool, the papermaking slurry is ground by a conical refiner, and the papermaking slurry is poured into a post-grinding pool for standby. If the prepared paper has broken paper, the broken paper can be put into a hydropulper for breaking, then put into a dry breaking pool, and subjected to thinning and pulping treatment by using a thinning device, and put into a wet breaking pool for standby after finishing. At this time, chemical softwood pulp and hardwood pulp in the post-grinding pond and damaged pulp in the wet damage pond can be put into a pulp mixing pond to be mixed, and a reinforcing agent, an internal sizing agent, a retention aid and a filler are added to obtain a pretreated pulp.
Step 102: and manufacturing the pretreated slurry into paper.
Illustratively, the mixed slurry is first formed by dewatering on a wire to obtain a wet paper sheet. The concentration of the net surfing slurry is 0.3-0.7%, and the slurry net speed ratio is as follows: 0.9-1.0, ensuring good uniformity. Then, the wet paper sheet thus dehydrated is pressed to be dehydrated. The reaction pressure is 0.2-0.3MPa, and the dryness of the paper sheet at the press part is 35-45%. And then, carrying out primary drying treatment on the dehydrated wet paper, carrying out secondary drying treatment after sizing by using a surface sizing agent to obtain a paper semi-finished product, and then, carrying out calendaring on the paper semi-finished product, and coiling to obtain the paper. According to the embodiment of the invention, the surface sizing agent can be selected as at least one of modified starch and polyvinyl alcohol, and the mass part of the surface sizing agent in paper is limited to be 5.0-6.0 parts by adjusting the surface sizing process, so that the product has good film forming performance, the printing adaptability is improved, and the probability of powder falling of the printed bar code is reduced. The modified starch in the embodiment of the invention can form a liquid-repellent adhesive film on the surface of the paper, and the surface strength, the sizing degree, the smoothness, the folding endurance and the like of the paper after sizing are obviously improved. It should be understood that the amount of the modifying monomer in the modified starch is 3-5% of the starch, and the selection of the modifying monomer can be adjusted according to practical situations, and is not limited herein.
According to experiments, under the combined action of 0.3-1.0 part of reinforcing agent and 0.02-0.025 part of retention aid, 15.0-20.0 parts of filler, the prepared paper has a quantitative weight of 40g/m 2～46g/m2, an opacity of 72-78% and a surface strength of 1.5-2.0 m/s, so that the paper has better opacity, the surface strength is improved, and the probability of powder dropping of the printed bar code is further reduced.
The embodiment of the invention also provides the paper, which can improve the surface strength of the paper while having better opacity. The paper comprises paper fiber, a reinforcing agent, a retention aid and a filler, wherein the basis weight of the paper is 40g/m 2～46g/m2, the opacity of the paper is 72-78%, and the surface strength of the paper is 1.5-2.0 m/s; the paper contains 0.3 to 1.0 part by weight of reinforcing agent, 0.02 to 0.025 part by weight of retention aid and 15.0 to 20.0 parts by weight of filler, so that the paper has better opacity, the surface strength is improved, and the probability of powder falling of the printed bar code is reduced due to the high surface strength of the paper.
The embodiment of the invention also provides application of the paper in the medicine specification. Because the paper provided by the embodiment has the advantages of high opacity and high surface strength, the paper cannot be damaged in the subsequent folding process, and the printing effect is improved to some extent, so that the use requirement of customers is met.
In order to verify the effect of the preparation method of the paper provided by the embodiment of the invention, the embodiment of the invention is proved by adopting the embodiment.
Example 1
First, preparing pretreatment slurry: and (3) crushing 15 parts by mass of chemical softwood pulp and 85 parts by mass of hardwood pulp, removing slag, and pulping to obtain papermaking pulp. Subsequently, 0.3 parts by mass of cationic starch, 1.2 parts by mass of alkyl ketene dimer, 0.02 parts by mass of cationic polyacrylamide, and 15.0 parts by mass of filler were added to the papermaking slurry to obtain a pretreated slurry.
Wherein the filler comprises calcium carbonate, titanium dioxide and talcum powder. The total of the calcium carbonate, the titanium dioxide and the talcum powder is 100 parts, wherein the weight part of the calcium carbonate is 70 parts, the weight part of the titanium dioxide is 15 parts, and the weight part of the talcum powder is 15 parts. The disintegration concentration of the papermaking slurry was 5.0%, and the freeness of the papermaking slurry was 60 ° SR. If the paper made by the papermaking process has broke, the broke is fluffed to obtain broke pulp, and the broke pulp is added into papermaking pulp.
Secondly, preparing paper: and dehydrating and forming the pretreated slurry to obtain the wet paper sheet. The prepared slurry is subjected to deslagging and screening, and then is subjected to internet surfing and dehydration, wherein the concentration of the internet surfing slurry is 0.3%, and the speed ratio of the slurry to the net is as follows: 0.9:1. then, the wet paper sheet after the dehydration molding was pressed to be dehydrated at a reaction pressure of 0.2MPa and a press section dryness at the paper sheet was 36%. And then, carrying out primary drying treatment on the dehydrated wet paper, and carrying out secondary drying treatment after sizing by using modified starch and polyvinyl alcohol to obtain a paper semi-finished product. And finally, calendaring the semi-finished paper product, and coiling to obtain the paper. The basis weight of the paper was found to be 40g/m 2, the opacity of the paper was found to be 72%, and the surface strength of the paper was found to be 1.52m/s.
The modified starch is surface oxidized starch, the surface oxidized starch and the polyvinyl alcohol are used as surface sizing agents, the mass part of the surface oxidized starch is 80 parts, the mass part of the polyvinyl alcohol is 20 parts, and the mass part of the surface sizing agents contained in the paper is 7 parts by taking the sum of the surface oxidized starch and the polyvinyl alcohol as 100 parts by weight.
Example two
First, preparing pretreatment slurry: and (3) crushing 15 parts by mass of chemical softwood pulp and 85 parts by mass of hardwood pulp, removing slag, and pulping to obtain papermaking pulp. Subsequently, 0.5 parts by mass of cationic starch, 1.4 parts by mass of alkyl ketene dimer, 0.025 parts by mass of cationic polyacrylamide, and 20.0 parts by mass of filler were added to the papermaking slurry to obtain a pretreated slurry.
Wherein the filler comprises calcium carbonate and diatomite, and the weight part of the calcium carbonate is 80 parts and the weight part of the diatomite is 20 parts based on 100 parts of the sum of the calcium carbonate and the diatomite. The disintegration concentration of the papermaking slurry was 6.0%, and the freeness of the papermaking slurry was 60 ° SR. If the paper made by the papermaking process has broke, the broke is fluffed to obtain broke pulp, and the broke pulp is added into papermaking pulp.
Secondly, preparing paper: and dehydrating and forming the pretreated slurry to obtain the wet paper sheet. The prepared slurry is subjected to deslagging and screening, and then is subjected to internet surfing and dehydration, wherein the concentration of the internet surfing slurry is 0.3%, and the speed ratio of the slurry to the net is as follows: 1:1. then, the wet paper sheet after the dehydration molding was pressed to be dehydrated at a reaction pressure of 0.2MPa and a press section dryness at the paper sheet was 36%. And then, carrying out primary drying treatment on the dehydrated wet paper, and carrying out secondary drying treatment after sizing by using modified starch and polyvinyl alcohol to obtain a paper semi-finished product. And finally, calendaring the semi-finished paper product, and coiling to obtain the paper. The basis weight of the paper was measured to be 42g/m 2, the opacity of the paper was 74%, and the surface strength of the paper was 1.05m/s.
The modified starch is cationic starch, the cationic starch and the polyvinyl alcohol are used as surface sizing agents, the mass part of the cationic starch is 75 parts, the mass part of the polyvinyl alcohol is 25 parts, and the mass part of the surface sizing agents contained in the paper is 7 parts by taking the sum of the cationic starch and the polyvinyl alcohol as 100 parts by weight.
Example III
First, preparing pretreatment slurry: and (3) crushing 15 parts by mass of chemical softwood pulp and 85 parts by mass of hardwood pulp, removing slag, and pulping to obtain papermaking pulp. Subsequently, 0.8 parts by mass of cationic starch, 1.4 parts by mass of alkyl ketene dimer, 0.025 parts by mass of cationic polyacrylamide and filler were added to the papermaking slurry to obtain a pretreated slurry.
Wherein, the breaking concentration of the papermaking slurry is 6.0 percent, and the beating degree of the papermaking slurry is 60 DEG SR. If the paper made by the papermaking process has broke, the broke is fluffed to obtain broke pulp, and the broke pulp is added into papermaking pulp. The paper in this example contained 19.0 parts by mass of filler comprising calcium carbonate and kaolin, with the total of the calcium carbonate and kaolin being 100 parts by weight, 80 parts by mass of calcium carbonate and 20 parts by mass of kaolin.
Secondly, preparing paper: and dehydrating and forming the pretreated slurry to obtain the wet paper sheet. The prepared slurry is subjected to deslagging and screening, and then is subjected to internet surfing and dehydration, wherein the concentration of the internet surfing slurry is 0.3%, and the speed ratio of the slurry to the net is as follows: 1:1. then, the wet paper sheet after the dehydration molding was pressed to be dehydrated at a reaction pressure of 0.2MPa and a press section dryness at the paper sheet was 36%. And then, carrying out primary drying treatment on the dehydrated wet paper, and carrying out secondary drying treatment after sizing by using modified starch and polyvinyl alcohol to obtain a paper semi-finished product. And finally, calendaring the semi-finished paper product, and coiling to obtain the paper. The basis weight of the paper was found to be 45g/m 2, the opacity of the paper was found to be 76% and the surface strength of the paper was found to be 1.63m/s.
Wherein the modified starch is anionic starch, the anionic starch and the polyvinyl alcohol are used as surface sizing agents, the mass part of the anionic starch is 90 parts, the mass part of the polyvinyl alcohol is 10 parts, and the mass part of the surface sizing agents contained in the paper is 7 parts by taking the sum of the anionic starch and the polyvinyl alcohol as 100 parts by weight.
Example IV
First, preparing pretreatment slurry: and (3) crushing 15 parts by mass of chemical softwood pulp and 85 parts by mass of hardwood pulp, removing slag, and pulping to obtain papermaking pulp. Subsequently, 0.8 parts by mass of cationic starch, 1.4 parts by mass of alkyl ketene dimer, 0.025 parts by mass of cationic polyacrylamide and filler were added to the papermaking slurry to obtain a pretreated slurry.
Wherein, the breaking concentration of the papermaking slurry is 6.0 percent, and the beating degree of the papermaking slurry is 60 DEG SR. If the paper made by the papermaking process has broke, the broke is fluffed to obtain broke pulp, and the broke pulp is added into papermaking pulp. In this example, the paper contained 19.0 parts by mass of filler comprising calcium carbonate and kaolin, with the total of the calcium carbonate and kaolin being 100 parts by weight, 70 parts by mass of calcium carbonate and 30 parts by mass of kaolin.
Secondly, preparing paper: and dehydrating and forming the pretreated slurry to obtain the wet paper sheet. The prepared slurry is subjected to deslagging and screening, and then is subjected to internet surfing and dehydration, wherein the concentration of the internet surfing slurry is 0.3%, and the speed ratio of the slurry to the net is as follows: 1:1. then, the wet paper sheet after the dehydration molding was pressed to be dehydrated at a reaction pressure of 0.2MPa and a press section dryness at the paper sheet was 36%. And then, carrying out primary drying treatment on the dehydrated wet paper, and carrying out secondary drying treatment after sizing by using modified starch and polyvinyl alcohol to obtain a paper semi-finished product. And finally, calendaring the semi-finished paper product, and coiling to obtain the paper. The basis weight of the paper was found to be 46g/m 2, the opacity of the paper was 77%, and the surface strength of the paper was found to be 1.71m/s.
The modified starch is surface oxidized starch, the surface oxidized starch and the polyvinyl alcohol are used as surface sizing agents, the weight part of the modified starch is 90 parts, the weight part of the polyvinyl alcohol is 10 parts, and the weight part of the surface sizing agents contained in the paper is 8 parts by taking the sum of the surface oxidized starch and the polyvinyl alcohol as 100 parts by weight.
Example five
First, preparing pretreatment slurry: and (3) crushing 15 parts by mass of chemical softwood pulp and 85 parts by mass of hardwood pulp, removing slag, and pulping to obtain papermaking pulp. Subsequently, 0.8 parts by mass of cationic starch, 1.4 parts by mass of alkyl ketene dimer, 0.025 parts by mass of cationic polyacrylamide and filler were added to the papermaking slurry to obtain a pretreated slurry.
Wherein, the breaking concentration of the papermaking slurry is 6.0 percent, and the beating degree of the papermaking slurry is 60 DEG SR. If the paper made by the papermaking process has broke, the broke is fluffed to obtain broke pulp, and the broke pulp is added into papermaking pulp. In this example, calcium carbonate and kaolin were used as fillers, and the paper contained 19.0 parts by weight of the filler, 60 parts by weight of calcium carbonate and 40 parts by weight of kaolin, based on 100 parts by weight of the sum of calcium carbonate and kaolin
Secondly, preparing paper: and dehydrating and forming the pretreated slurry to obtain the wet paper sheet. The prepared slurry is subjected to deslagging and screening, and then is subjected to internet surfing and dehydration, wherein the concentration of the internet surfing slurry is 0.3%, and the speed ratio of the slurry to the net is as follows: 1:1. then, the wet paper sheet after the dehydration molding was pressed to be dehydrated at a reaction pressure of 0.2MPa and a press section dryness at the paper sheet was 36%. And then, carrying out primary drying treatment on the dehydrated wet paper, and carrying out secondary drying treatment after sizing by using modified starch and polyvinyl alcohol to obtain a paper semi-finished product. And finally, calendaring the semi-finished paper product, and coiling to obtain the paper. The basis weight of the paper was found to be 45g/m 2, the opacity of the paper was found to be 78% and the surface strength of the paper was found to be 2.0m/s.
The modified starch is surface oxidized starch, the surface oxidized starch and the polyvinyl alcohol are used as surface sizing agents, the mass part of the surface oxidized starch is 85 parts, the mass part of the polyvinyl alcohol is 15 parts, and the mass part of the surface sizing agents contained in the paper is 9 parts by weight based on 100 parts by weight of the sum of the surface oxidized starch and the polyvinyl alcohol.
Table 1 shows the performance test results of examples one to five.
As can be seen from the table, the opacity of the paper prepared in examples one to five is 72% -78%, the basis weight of the paper is 40g/m 2～46g/m2, and the surface strength of the paper is 1.5 m/s-2.0 m/s, which shows that under the combined action of the filler, the reinforcing agent and the retention aid, the retention rate of paper pulp in the preparation process and the binding force between fibers can be increased, and the fine fiber and the filler can be well retained, so that the surface strength of the paper is further improved and the probability of powder dropping of the printed bar code is reduced while the prepared paper has better opacity.
The foregoing is merely a specific embodiment of the invention, and it will be apparent that various modifications and combinations thereof can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are merely exemplary illustrations of the present invention as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present disclosure, and the present disclosure is intended to be covered by the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for producing paper, characterized in that the basis weight of the paper is 35g/m 2～50g/m2, the opacity of the paper is 72% -78%, the surface strength of the paper is 1.5 m/s-2.0 m/s, the method for producing paper comprises:
adding filler, reinforcing agent and retention aid into papermaking slurry to obtain pretreated slurry;
And manufacturing paper from the pretreated slurry, wherein the paper comprises 0.3 to 1.0 part by weight of reinforcing agent, the paper comprises 0.02 to 0.025 part by weight of retention aid, the filler comprises 15.0 to 20.0 parts by weight of calcium carbonate 70 to 80 parts by weight and 20 to 30 parts by weight of advanced filler, and the advanced filler comprises at least one of titanium dioxide, talcum powder, diatomite and kaolin.
2. The method for producing a sheet according to claim 1, characterized in that the method for producing a sheet further comprises:
Mixing chemical softwood pulp and hardwood pulp to obtain papermaking pulp, wherein the mass portion of the chemical softwood pulp is 15-25 portions, and the mass portion of the hardwood pulp is 75-85 portions.
3. The method for producing paper according to claim 1, wherein the breaking concentration of the papermaking slurry is 5.0 to 6.0%, and the freeness of the papermaking slurry is 50 ° SR to 60 ° SR; the pretreatment sizing agent is further added with an internal sizing agent, wherein the paper comprises 1.0-2.0 parts by mass of the internal sizing agent.
4. The method for producing a sheet according to claim 1, characterized in that the method for producing a sheet further comprises:
if the paper made by the papermaking has broke, carrying out fluffing treatment on the broke to obtain broke pulp;
The broke pulp is added to the papermaking stock.
5. The method according to claim 4, wherein the broken pulp has a breaking strength of 2.0 to 3.0% and a freeness of 50 ° to 55 ° SR.
6. The method of producing paper according to any one of claims 1 to 5, characterized in that the making of the pre-treated slurry into paper comprises:
Dehydrating and molding the pretreated slurry to obtain a wet paper sheet;
And (3) carrying out dehydration treatment, drying treatment and calendaring treatment on the wet paper sheet, and coiling to obtain paper.
7. The method for producing paper according to claim 6, wherein,
The number of times of the drying treatment is two, the wet paper sheet is subjected to dehydration treatment, drying treatment and calendaring treatment, and the paper is obtained by coiling, comprising:
Carrying out dehydration treatment on the wet paper sheet to obtain a dehydrated wet paper sheet;
carrying out primary drying treatment on the dehydrated wet paper, and carrying out secondary drying treatment after sizing by using a surface sizing agent to obtain a paper semi-finished product;
And (3) carrying out calendaring treatment on the paper semi-finished product, and coiling to obtain the paper.
8. The method of producing paper according to claim 7, wherein in the paper, the surface sizing agent is 5.0 parts to 6.0 parts by mass, and the surface sizing agent includes at least one of modified starch and polyvinyl alcohol.
9. The paper is characterized by comprising paper fibers, a reinforcing agent, a retention aid and a filler, wherein the basis weight of the paper is 35g/m 2～50g/m2, the opacity of the paper is 72-78%, and the surface strength of the paper is 1.5-2.0 m/s;
The paper comprises 0.3 to 1.0 part by weight of reinforcing agent, 0.02 to 0.025 part by weight of retention aid and 15.0 to 20.0 parts by weight of filler.
10. Use of the paper of claim 9 in the manufacture of a pharmaceutical product.
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