CN113293646B - Anti-counterfeiting white cardboard and preparation method thereof - Google Patents
Anti-counterfeiting white cardboard and preparation method thereof Download PDFInfo
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- CN113293646B CN113293646B CN202110720609.6A CN202110720609A CN113293646B CN 113293646 B CN113293646 B CN 113293646B CN 202110720609 A CN202110720609 A CN 202110720609A CN 113293646 B CN113293646 B CN 113293646B
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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
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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
-
- 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
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
- D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
Abstract
The invention relates to the technical field of white cardboard production, and discloses an anti-counterfeiting white cardboard which comprises a surface paper layer, a core paper layer and a bottom paper layer which are sequentially arranged, wherein the core paper layer comprises a body and anti-counterfeiting dye, and the anti-counterfeiting dye comprises the following components in parts by mass: 30-45 parts of ammonium carbonate; 8-10 parts of a film forming agent; 3-6 parts of a core body; 2-5 parts of vegetable oil; 2-4 parts of titanium dioxide. The invention can achieve the anti-counterfeiting effect.
Description
Technical Field
The invention relates to the technical field of white cardboard production, in particular to an anti-counterfeiting white cardboard and a preparation method thereof.
Background
White cardboard is generally distinguished as: blue-white single-sided copper plate card paper, white bottom copper plate card paper and gray bottom copper plate card paper. The white cardboard is a single-layer or multi-layer combined paper which is completely made by bleaching chemical pulping and is fully sized, is suitable for printing and product packaging, and has a common quantitative weight of more than 150 g/square meter. This jam is characterized by: high smoothness, good stiffness, neat appearance and good evenness. May be used for business cards, menus or similar products.
The white cardboard is a thick, solid, pure and high-quality white cardboard made of wood pulp, is subjected to calendaring or embossing treatment, is mainly used for printing stocks for packaging and decoration, is generally divided into A, B, C grades, has a quantitative value of between 210 and 400 grams per square meter, and is mainly used for printing business cards, invitation cards, certificates, trademarks, packaging and decoration and the like.
The white cardboard for the mouth has a considerable market share in the domestic market, but the white cardboard for the home has the potential of occupying the market. After China adds WTO, although the import tax rate of the white cardboard is reduced, the absolute amount of the import tax is still higher because the white cardboard is high-value paper (the normal price is generally USD 950-1100/MT), and even if the white cardboard is produced by all imported wood pulp, the white cardboard has certain advantages in price because the tariff of the wood pulp is zero.
Disclosure of Invention
The invention aims to provide an anti-counterfeiting white cardboard and a preparation method thereof, and aims to achieve the anti-counterfeiting purpose.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides an anti-fake ivory board, is including face paper layer, core paper layer and the bottom paper layer that sets gradually, core paper layer is including body and anti-fake dyestuff, according to the part by mass, anti-fake dyestuff is including:
the invention is further provided with: the core comprises silicon dioxide.
The invention is further provided with: the core body also comprises one or two of nano aluminum oxide and zirconium dioxide.
The invention is further provided with: the adhesive also comprises 1-3 parts by mass of sodium carboxymethyl cellulose or sodium carboxymethyl starch or a mixture of the sodium carboxymethyl cellulose and the sodium carboxymethyl starch.
The invention is further provided with: the cellulose acetate fiber also comprises 1-2 parts of methyl cellulose by mass.
The invention is further provided with: the film forming agent comprises one or a mixture of more of an acrylic resin film forming agent, a butadiene resin film forming agent and a polyurethane film forming agent.
The invention is further provided with: the vegetable oil comprises one or more of soybean oil, corn oil and olive oil.
The invention also discloses a method for preparing the anti-counterfeiting white cardboard, which comprises the following steps:
s1, taking the raw materials of the anti-counterfeiting dye according to the mass parts, adding water, and mixing, wherein the mass of the water is 6-8 times of the mass sum of the anti-counterfeiting dye;
s2, taking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry, and adjusting the pH values of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry to 6.5-7.5;
s3, dewatering and papermaking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry through corresponding forming nets, and spraying the anti-counterfeiting dye in the S1 onto the core paper layer in the dewatering and papermaking process of the core paper layer;
s4, compounding the surface paper layer, the core paper layer and the bottom paper layer;
s5, pressing, primary drying, sizing, secondary drying, hard calendering, coating, soft calendering and reeling are sequentially carried out on the composite layer in the S4 to obtain a finished product; wherein the temperature of the first drying and the second drying is lower than 50 ℃.
The invention is further provided with: the first drying and the second drying in the S5 adopt one or more of adsorption drying, vacuum drying and cooling drying.
The invention is further provided with: and in the step S3, the anti-counterfeiting dye solution is sprayed on one side of the core paper layer, and negative pressure adsorption is carried out on the other side of the core paper layer, so that the penetration of the anti-counterfeiting dye solution into the core paper layer is accelerated.
The beneficial effects of the invention are: after the anti-counterfeiting dye and the core paper layer are mutually blended or mixed into a whole, the produced white cardboard (the core paper layer is positioned between the surface paper layer and the bottom paper layer) is mainly suitable for scenes with low humidity or drying, and the used temperature is not easy to be too high, such as some drying low-temperature areas or drying low-temperature areas, so that the whole white cardboard can be normally used in normal use.
When anti-counterfeiting identification is required, the surface paper layer or the bottom paper layer needs to be dried and heated (i.e. water, oil and alcohol lamp liquid cannot be used by drying or radiation heating and the like), the heating temperature is higher than 60 ℃, but the heating temperature needs to be lower than the ignition point of the surface paper layer or the bottom paper layer, wherein the heating temperature is preferably 90-100 ℃, so that the decomposition of ammonium carbonate can be well promoted; wherein, the decomposed ammonium carbonate can partially cause the bulge phenomenon of the white cardboard in the anti-counterfeiting process; however, as the film forming agent and the vegetable oil are also arranged in the anti-counterfeiting dye, most of components decomposed from ammonium carbonate still stay in situ, and the swelling phenomenon can be gradually recovered even recovered after the heating is stopped for a period of time; however, if the white cardboard is torn off in the anti-counterfeiting process, a slight pungent smell can be smelled, and the anti-counterfeiting can also be carried out. Namely, the anti-counterfeiting means can be that whether the bulge exists is observed after heating, and whether the bulge can be reduced or recovered after heating is stopped; and whether the sharp odor can be smelled by heating after tearing.
After the film forming agent is added into the core paper layer and sprayed on the core paper layer, firstly, the film forming agent can improve the viscosity of the anti-counterfeiting dye in the subsequent compounding process, so that the anti-counterfeiting dye can have better bonding strength with the core paper layer, and meanwhile, in the subsequent compounding process in the production process, the film forming agent impregnated with the core paper layer can also improve the bonding strength between the core paper layer and the surface paper layer and the bottom paper layer, so that the compounding degree of the whole white cardboard is improved; furthermore, after the white cardboard is produced and formed, the film forming agent forms a film layer, but since the whole film forming agent and the core paper layer are impregnated, the film formed by the film forming agent is also integrated with the whole core paper layer, and the ammonium carbonate and the core are dispersed in the film formed by the film forming agent. The ammonium carbonate is dispersed in the film-shaped film forming agent, so that the film-shaped form of the film forming agent can play a role in protecting the ammonium carbonate, namely, water permeating into the core paper layer from the surface paper layer and the bottom paper layer can be well blocked, and a part of higher temperature caused by special conditions can be resisted, so that the anti-counterfeiting function of the white cardboard can be continuously and stably maintained;
in the formed white cardboard, the film shape generated by the film forming agent can improve the bonding complex degree of the surface paper layer, the core paper layer and the bottom paper layer, and also has the effect of improving the strength of the white cardboard, so that the film formed by the film forming agent can enable all parts of the white cardboard to generate interaction force, thereby enabling the white cardboard to have better strength, folding strength and the like in the using process, and ensuring the service life of the white cardboard.
Meanwhile, the vegetable oil in the anti-counterfeiting dye can also play a role in protecting the ammonium carbonate to resist water and the like partially permeating from the surface paper layer and the bottom paper layer to the core paper layer, and meanwhile, the vegetable oil also has a certain cooling effect, so that the vegetable oil can play a role in protecting the ammonium carbonate to a certain extent in the production, transfer and storage processes; however, when the temperature is raised for anti-counterfeiting, the raised temperature of the white cardboard only needs to exceed the absorption capacity of the vegetable oil, so that the vegetable oil does not influence the normal anti-counterfeiting process.
The film-forming agent and the vegetable oil can block moisture, absorb partial accidental heat and block the emission of gas in the anti-counterfeiting process, namely in the heating anti-counterfeiting process, the vegetable oil and the film-forming agent can prevent the decomposed ammonium carbonate gas component from overflowing and can better keep or stay at the original position, so that the swelling phenomenon can be better caused; meanwhile, after the bulge is finished, the decomposed components or substances can be quickly accelerated to react again, so that the bulge disappears; or after the white cardboard is heated and torn by a person who checks the anti-counterfeiting function, the gas staying in the film forming agent and the vegetable oil can be intensively acted on the nose of the person who checks the anti-counterfeiting function, so that the accuracy of the checking and the anti-counterfeiting function is improved, namely, the checking effect is improved (namely, if the gas is released after being concentrated, the gas can be better identified by the person who checks the anti-counterfeiting function).
Moreover, after the core in the anti-counterfeiting dye is mainly dispersed in the core paper layer, the core plays a role of heating the core under the action of a wick effect (namely the specific heat capacity of the core is lower, so that the local temperature around the core can be raised, namely the temperature of the surrounding environment is accelerated) during the anti-counterfeiting test, thereby accelerating the decomposition of ammonium carbonate and facilitating the anti-counterfeiting test; but simultaneously in the use, production, storage in ordinary times, the core can also play the effect of heat absorption (because its specific heat capacity is lower) to ammonium carbonate receives unexpected intensification and decomposes can be better prevented. Meanwhile, the titanium dioxide can also play a role of the core body, and can also play a whitening effect, so that the whiteness of the white cardboard is increased, and the quality of the white cardboard is improved.
Wherein the core is mainly silicon dioxide, also can dope one or several in some nanometer aluminium oxide, the zirconium dioxide according to actual conditions, these several compositions all have lower cost at first, simultaneously because the component as the core all has less particle diameter, consequently can be more dispersed when as the core play the effect of core, both play the absorption heat promptly and protect the ammonium carbonate (in-process such as production, transportation, storage), simultaneously when the inspection is anti-fake, can accelerate the decomposition of ammonium carbonate, thereby make the inspection anti-fake can go on more fast.
After the sodium carboxymethyl cellulose or sodium carboxymethyl starch in the anti-counterfeiting dye, the vegetable oil can be emulsified firstly, so that the vegetable oil can be distributed more uniformly and comprehensively, and the bonding effect of the vegetable oil and the surface paper layer can further improve the bonding strength between the core paper layer and the surface paper layer and the bottom paper layer, thereby improving the quality of the white cardboard. Meanwhile, the two paper layers also have moisture absorption, so that in the using and storing processes of the white cardboard, external water can be well prevented from entering and acting on the core paper layer, and the quality of the core paper layer is ensured.
Methyl cellulose plays a thickening role in anti-counterfeiting dye, can increase the adhesion degree between each component and the core paper layer, the surface paper layer and the bottom paper layer, can improve the adhesion between the core paper layer, the surface paper layer and the bottom paper layer, and ensures that the white cardboard is not layered and cracked, so the stability of the position and the form of ammonium carbonate, a core and the like is ensured from the side surface, the anti-counterfeiting process can be normally carried out, and the quality of the white cardboard is improved. Moreover, the methyl cellulose also has moldability, so that the same or similar effect is generated between the methyl cellulose and the film forming agent, and the methyl cellulose and the film forming agent supplement each other to further enhance the effect and the effect of the film forming agent.
In the subsequent production process of the white cardboard, the temperature of each step needs to be controlled to be lower than 50 ℃ at least, so that the stability of the form of the ammonium carbonate can be well guaranteed in the production process, the amount of the ammonium carbonate in the white cardboard can be kept, and the anti-counterfeiting function can be normally carried out. Meanwhile, the drying method in the application is preferably one or more of adsorption drying, vacuum drying and cooling drying, and other low-temperature drying methods can be selected according to actual conditions, which are not repeated herein.
When the anti-counterfeiting dye solution (namely the liquid with the anti-counterfeiting dye) is sprayed, the permeation speed and the permeation quantity of the anti-counterfeiting dye can be accelerated in a negative pressure adsorption mode on the other side, so that the anti-counterfeiting quality and effect are further ensured, and the quality of the white cardboard is improved.
Meanwhile, before papermaking, the pH value of the pulp of the surface paper layer, the core paper layer and the bottom paper layer needs to be adjusted to be 6.5-7.5, so that the reaction of ammonium carbonate and alkali or acid in the pulp can be well prevented, the ammonium carbonate can be stably kept in the white cardboard, and the anti-counterfeiting stability is high.
Meanwhile, the raw materials, the manufacturing and production methods and the like of the surface paper layer, the core paper layer and the base paper layer are the same as those of the market, and the anti-counterfeiting dyes used on the core paper layer are different; or, the core improvement point of the application is the anti-counterfeiting dye, and meanwhile, the anti-counterfeiting dye can be used on the core paper layer of all white cardboard on the market and plays a role and an effect of anti-counterfeiting.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
The utility model provides an anti-fake ivory board, is including face paper layer, core paper layer and the bottom paper layer that sets gradually, core paper layer is including body and anti-fake dyestuff, according to the part by mass, anti-fake dyestuff including:
the core is silicon dioxide powder.
The film forming agent is an acrylic resin film forming agent-polyaminophenol modified acrylic resin RFi6b 59.
The vegetable oil is soybean oil.
A method for preparing an anti-counterfeiting white cardboard as described above, comprising the steps of:
s1, taking the raw materials of the anti-counterfeiting dye according to the mass parts, adding water, and mixing, wherein the mass of the water is 6 times of the mass sum of the anti-counterfeiting dye;
s2, taking the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp, and adjusting the pH values of the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp to 6.5-7.5, wherein the pH values are respectively 6.8, 7.3 and 7.1 (after the ammonium carbonate is compounded, the stability of the ammonium carbonate can be maintained, and the ammonium carbonate does not react with external alkali or acid, the same applies in the following cases) according to the actual paper pulp condition (namely, the pH value of the pulp directly purchased is adjusted, or the pH value of the pulp obtained by breaking the purchased chemical pulp board by a hydraulic breaker is adjusted), and sodium hydroxide or hydrochloric acid is selected for adjustment (the same applies in the following cases);
s3, dewatering and papermaking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry through corresponding forming nets, and spraying the anti-counterfeiting dye in the S1 onto the core paper layer in the dewatering and papermaking process of the core paper layer;
s4, compounding the surface paper layer, the core paper layer and the bottom paper layer;
s5, pressing, primary drying, sizing, secondary drying, hard calendering, coating, soft calendering and reeling are sequentially carried out on the composite layer in the S4 to obtain a finished product; the temperature of the first drying and the second drying is lower than 50 ℃, and the temperature adopted in the embodiment is 47 ℃.
The first drying and the second drying in S5 are both adsorption drying.
And in the step S3, the anti-counterfeiting dye solution is sprayed on one side of the core paper layer, and negative pressure adsorption is carried out on the other side of the core paper layer, so that the penetration of the anti-counterfeiting dye solution into the core paper layer is accelerated.
The white cardboard is heated to 85 ℃ through dry heating, the white cardboard is bulged, and bulges disappear gradually after heating is stopped and are invisible to naked eyes; the pungent odor can be smelled by tearing after heating and heating to 90 deg.C after tearing.
Example 2
The utility model provides an anti-fake ivory board, is including face paper layer, core paper layer and the bottom paper layer that sets gradually, core paper layer is including body and anti-fake dyestuff, according to the part by mass, anti-fake dyestuff including:
the core body is silicon dioxide powder and nano aluminum oxide powder with equal mass.
The film forming agent is a polyurethane film forming agent-polyvinylpyrrolidone film forming agent (vinyl pyrrolidone/vinyl acetate copolymer) with the mass of 1/3 and 2/3 of polyaminophenol modified acrylic resin RFi6b 59.
The vegetable oil is corn oil.
A method for preparing an anti-counterfeiting white cardboard as described above, comprising the steps of:
s1, taking the raw materials of the anti-counterfeiting dye according to the mass parts, adding water, and mixing, wherein the mass of the water is 8 times of the mass sum of the anti-counterfeiting dye;
s2, taking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry, and adjusting the pH values of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry to be 6.5-7.5, wherein the pH values are respectively adjusted to be 7.0, 7.2 and 6.5 in the embodiment;
s3, dewatering and papermaking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry through corresponding forming nets, and spraying the anti-counterfeiting dye in the S1 onto the core paper layer in the dewatering and papermaking process of the core paper layer;
s4, compounding the surface paper layer, the core paper layer and the bottom paper layer;
s5, pressing, primary drying, sizing, secondary drying, hard calendering, coating, soft calendering and reeling are sequentially carried out on the composite layer in the S4 to obtain a finished product; wherein the temperature of the first drying and the second drying is lower than 50 ℃, and the temperature adopted in the embodiment is 45 ℃.
The first drying and the second drying in S5 are both vacuum drying.
And in the step S3, the anti-counterfeiting dye solution is sprayed on one side of the core paper layer, and negative pressure adsorption is carried out on the other side of the core paper layer, so that the penetration of the anti-counterfeiting dye solution into the core paper layer is accelerated.
The white cardboard is heated to 95 ℃ through dry heating, the white cardboard is bulged, and bulges disappear gradually after heating is stopped and are invisible to naked eyes; the product can be torn after heating and heated to 100 deg.C to smell pungent odor.
Example 3
The utility model provides an anti-fake ivory board, is including face paper layer, core paper layer and the bottom paper layer that sets gradually, core paper layer is including body and anti-fake dyestuff, according to the part by mass, anti-fake dyestuff including:
the core bodies are silicon dioxide powder with the mass of 1/3 and zirconium dioxide powder with the mass of 2/3.
The film forming agent is an acrylic resin film forming agent with equal mass, namely organic silicon modified acrylic resin 17X-8501 and a polyurethane film forming agent, namely a carboxylic resin film forming agent (acrylic ester/acrylamide copolymer).
The vegetable oil is olive oil.
A method for preparing an anti-counterfeiting white cardboard as described above, comprising the steps of:
s1, taking the raw materials of the anti-counterfeiting dye according to the mass parts, adding water, and mixing, wherein the mass of the water is 7 times of the mass sum of the anti-counterfeiting dye;
s2, taking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry, and adjusting the pH values of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry to be 6.5-7.5, wherein the pH values are respectively adjusted to be 6.9, 7.1 and 6.7 in the embodiment;
s3, dewatering and papermaking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry through corresponding forming nets, and spraying the anti-counterfeiting dye in the S1 onto the core paper layer in the dewatering and papermaking process of the core paper layer;
s4, compounding the surface paper layer, the core paper layer and the bottom paper layer;
s5, pressing, primary drying, sizing, secondary drying, hard calendering, coating, soft calendering and reeling are sequentially carried out on the composite layer in the S4 to obtain a finished product; wherein the temperature of the first drying and the second drying is lower than 50 ℃, and the temperature adopted in the embodiment is 44 ℃.
And in the step S5, the first drying and the second drying both adopt a temperature reduction drying method.
And in the step S3, the anti-counterfeiting dye solution is sprayed on one side of the core paper layer, and negative pressure adsorption is carried out on the other side of the core paper layer, so that the penetration of the anti-counterfeiting dye solution into the core paper layer is accelerated.
The white cardboard is heated to 95 ℃ through dry heating, the white cardboard is bulged, and bulges disappear gradually after heating is stopped and are invisible to naked eyes; after heating, tearing off and heating to 90 ℃ after tearing off, the user can smell pungent smell.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. The utility model provides an anti-fake ivory board which characterized in that, including face paper layer, core paper layer and the bottom paper layer that sets gradually, core paper layer is including body and anti-fake dyestuff, according to the part by mass, anti-fake dyestuff is including:
also comprises 1-3 parts of sodium carboxymethyl cellulose or sodium carboxymethyl starch or the mixture of the sodium carboxymethyl cellulose and the sodium carboxymethyl starch.
2. An anti-counterfeit ivory board according to claim 1, wherein: the core comprises silicon dioxide.
3. An anti-counterfeit ivory board according to claim 2, wherein: the core body also comprises one or two of nano aluminum oxide and zirconium dioxide.
4. An anti-counterfeit ivory board according to claim 1, wherein: the cellulose acetate fiber also comprises 1-2 parts of methyl cellulose by mass.
5. An anti-counterfeit ivory board according to claim 1, wherein: the film forming agent comprises one or a mixture of more of an acrylic resin film forming agent, a butadiene resin film forming agent and a polyurethane film forming agent.
6. An anti-counterfeit ivory board according to claim 1, wherein: the vegetable oil comprises one or more of soybean oil, corn oil and olive oil.
7. A method for preparing an antiforge ivory board according to any one of claims 1 to 6, wherein: the method comprises the following steps:
s1, taking the raw materials of the anti-counterfeiting dye according to the mass parts, adding water, and mixing, wherein the mass of the water is 6-8 times of the mass sum of the anti-counterfeiting dye;
s2, taking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry, and adjusting the pH values of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry to be 6.5-7.5;
s3, dewatering and papermaking the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry through corresponding forming nets, and spraying the anti-counterfeiting dye in the S1 onto the core paper layer in the dewatering and papermaking process of the core paper layer;
s4, compounding the surface paper layer, the core paper layer and the bottom paper layer;
s5, pressing, primary drying, sizing, secondary drying, hard calendering, coating, soft calendering and reeling are sequentially carried out on the composite layer in the S4 to obtain a finished product; wherein the temperature of the first drying and the second drying is lower than 50 ℃.
8. The method for preparing an anti-counterfeit ivory board according to claim 7, wherein the method comprises the following steps: the first drying and the second drying in the S5 adopt one or more of adsorption drying, vacuum drying and cooling drying.
9. The method for preparing an anti-counterfeiting white cardboard according to claim 7, wherein the method comprises the following steps: and in the step S3, the anti-counterfeiting dye solution is sprayed on one side of the core paper layer, and negative pressure adsorption is carried out on the other side of the core paper layer, so that the penetration of the anti-counterfeiting dye solution into the core paper layer is accelerated.
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| EP3357706A4 (en) * | 2015-10-02 | 2018-10-03 | Toppan Printing Co., Ltd. | Counterfeit-preventing structure |
| CN105951520B (en) * | 2016-04-28 | 2018-04-13 | 华南理工大学 | A kind of anti-counterfeiting coating white card paper and preparation method thereof |
| CN211075000U (en) * | 2019-11-26 | 2020-07-24 | 深圳市宜美特科技有限公司 | Thermal shrinkage anti-counterfeiting film with laser relief layer |
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