CN117926637A - Plastic-absorbing white cardboard and plastic-absorbing package suitable for printing narrow edges in large quantities on site - Google Patents
Plastic-absorbing white cardboard and plastic-absorbing package suitable for printing narrow edges in large quantities on site Download PDFInfo
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- 239000011111 cardboard Substances 0.000 title claims abstract description 38
- 239000010410 layer Substances 0.000 claims abstract description 151
- 239000000835 fiber Substances 0.000 claims abstract description 70
- 238000004513 sizing Methods 0.000 claims abstract description 69
- 239000000123 paper Substances 0.000 claims abstract description 63
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 56
- 229920003023 plastic Polymers 0.000 claims abstract description 54
- 239000004033 plastic Substances 0.000 claims abstract description 53
- 239000011247 coating layer Substances 0.000 claims abstract description 51
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000002344 surface layer Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000012792 core layer Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000012546 transfer Methods 0.000 claims abstract description 10
- 229920002472 Starch Polymers 0.000 claims abstract description 9
- 239000008107 starch Substances 0.000 claims abstract description 9
- 235000019698 starch Nutrition 0.000 claims abstract description 9
- 102000004190 Enzymes Human genes 0.000 claims abstract description 6
- 108090000790 Enzymes Proteins 0.000 claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 39
- 239000004816 latex Substances 0.000 claims description 32
- 229920000126 latex Polymers 0.000 claims description 32
- 239000000853 adhesive Substances 0.000 claims description 31
- 230000001070 adhesive effect Effects 0.000 claims description 31
- 239000011248 coating agent Substances 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 29
- 239000002994 raw material Substances 0.000 claims description 23
- 239000011121 hardwood Substances 0.000 claims description 18
- 239000002023 wood Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 15
- 239000000049 pigment Substances 0.000 claims description 14
- 229920001131 Pulp (paper) Polymers 0.000 claims description 11
- 241001397809 Hakea leucoptera Species 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 8
- 238000013329 compounding Methods 0.000 claims description 6
- 239000011122 softwood Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 5
- 239000002655 kraft paper Substances 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 238000007603 infrared drying Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000002174 Styrene-butadiene Substances 0.000 claims description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000011115 styrene butadiene Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims 4
- 238000000465 moulding Methods 0.000 claims 1
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- 230000008901 benefit Effects 0.000 abstract description 6
- 238000004806 packaging method and process Methods 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 16
- FDYSSWYQRTVFIS-UHFFFAOYSA-N buta-1,3-diene 3-phenylprop-2-enoic acid Chemical compound C=CC=C.C(=O)(O)C=CC1=CC=CC=C1 FDYSSWYQRTVFIS-UHFFFAOYSA-N 0.000 description 9
- 239000004927 clay Substances 0.000 description 7
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
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- AZUYLZMQTIKGSC-UHFFFAOYSA-N 1-[6-[4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-3-(1-methylindazol-5-yl)pyrazol-1-yl]-2-azaspiro[3.3]heptan-2-yl]prop-2-en-1-one Chemical compound ClC=1C(=C2C=NNC2=CC=1C)C=1C(=NN(C=1C)C1CC2(CN(C2)C(C=C)=O)C1)C=1C=C2C=NN(C2=CC=1)C AZUYLZMQTIKGSC-UHFFFAOYSA-N 0.000 description 1
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- 229920001971 elastomer Polymers 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
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Abstract
The invention discloses a plastic-absorbing white cardboard and plastic-absorbing packaging suitable for printing narrow edges in large quantities in the field, and belongs to the technical field of papermaking. The technical proposal is as follows: the coating layer, the surface sizing layer and the raw paper layer are sequentially arranged from top to bottom; the coating layer comprises a top coating layer and a precoating coating layer; the surface sizing layer adopts the mixture of enzyme converted starch and spherical light calcium carbonate as sizing agent, and is coated on the surface of the base paper through film transfer; the raw paper layer comprises a surface layer fiber layer, a core layer fiber layer and a bottom layer fiber layer. The invention solves the problems that the heating time of the spot ink, the water-based plastic absorbing oil, the PET material bubble shell and the plastic absorbing is less than 2S, and the tearing area is not more than 90 percent, thereby obtaining good economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a plastic-absorbing white cardboard and plastic-absorbing packaging suitable for printing narrow-side plastic absorption in large ink quantity on the spot.
Background
With the development of economy, the packaging requirements of people on products are increasing. The plastic package is a novel package form developed in the last decade, and is widely applied to packages of products such as toothbrushes, batteries, toys, hardware and the like because the package mode is excellent in quality, low in cost and capable of beautifying the products, and more customers are attracted.
Half of the blister packaging adopts white cardboard, and half adopts transparent plastic, so that the dosage of the blister white cardboard is increased along with the development of the blister packaging form. The basic process of plastic sucking process is to coat a layer of plastic sucking oil on the surface of the coated white cardboard after printing, wherein the plastic sucking oil is water-based or oil-based plastic sucking oil which has both plastic sucking function and common gloss oil function, and a processing procedure of heating plastic bubble shells (such as PVC, PET and the like) with the printed cardboard by hot pressing under the conditions of high temperature and high pressure by using an electric heating or high-frequency plastic sucking machine by utilizing the adhesion performance of the plastic sucking oil after heating. In the process of plastic suction, when the temperature, pressure, upper plastic suction amount, plastic suction bubble shell and the like are fixed, the result of the plastic suction effect mainly depends on the performance of the coated white paperboard.
The judgment of whether the plastic sucking result is qualified is based on whether the plastic bubble shell can be torn open to break the fiber layer to more than 90% of the fiber layer below the plastic sucking surface. The plastic sucking result is related to the thickness of the printing ink, the type of the plastic sucking oil, the type of the plastic foam and the size of the plastic sucking surface of the plastic foam, wherein the plastic sucking mode with the highest difficulty is that the printing ink layer adopts solid ink, the plastic sucking oil layer adopts water-based plastic sucking oil, the plastic foam adopts PET material foam, the plastic sucking heating time is less than 2S, and the general plastic sucking white paperboard is difficult to tear to the fiber layer and destroy more than 90 percent of the area, so that the plastic sucking white paperboard suitable for large-scale printing of narrow sides on the spot is required to be developed, and the plastic sucking package is prepared by utilizing the plastic sucking white paperboard, so that the requirements of tearing to the fiber layer and destroying more than 90 percent of the area are met.
Disclosure of Invention
The invention provides a plastic-absorbing white cardboard and plastic-absorbing package suitable for printing narrow edges in large quantities of ink on the spot, which solves the problems that the heating time of the spot ink, the water-based plastic-absorbing oil, the PET material bubble shell and the plastic absorption is less than 2S, and the tearing area is not more than 90% and achieves good economic and social benefits.
The technical scheme of the invention is as follows:
In the first aspect, a plastic-absorbing white cardboard suitable for printing narrow edges in large quantities on the spot is disclosed, wherein the plastic-absorbing white cardboard is sequentially provided with a coating layer, a surface sizing layer and a raw paper layer from top to bottom;
The coating layer comprises a top coating layer and a precoating coating layer;
the top-coat paint layer comprises the following raw materials in parts by weight: the pigment comprises 40-60 parts of needle-shaped or rod-shaped light calcium carbonate and 60-40 parts of calcined soil, and the total part is 100; the adhesive adopts synthetic latex, the absolute dry dosage of the adhesive is 15-20 parts, and the adhesive also comprises 1-2 parts of aqueous polyurethane;
The precoating coating layer comprises the following raw materials in parts by weight: the pigment composition comprises 60-80 parts of 60-grade calcium carbonate, 40-20 parts of calcined soil and 100 parts of total pigment; the adhesive adopts synthetic latex, and the absolute dry dosage of the adhesive is 15-20 parts;
The surface sizing layer adopts a mixture of 60-80 parts by weight of enzyme converted starch and 20-40 parts by weight of spherical light calcium carbonate as sizing agent, and is coated on the surface of base paper through film transfer;
the raw paper layer comprises a surface layer fiber layer, a core layer fiber layer and a bottom layer fiber layer;
The surface layer fiber layer adopts 100% hardwood bleached sulfate pulp, the core layer fiber layer adopts hardwood bleached chemi-thermomechanical pulp and paper machine broke, and the weight ratio of the hardwood bleached chemi-thermomechanical pulp to the paper machine broke is 60-70:30-40; the bottom fiber layer adopts needle wood bleached sulfate pulp and broad wood bleached sulfate pulp, and the weight ratio of the needle wood bleached sulfate pulp to the broad wood bleached sulfate pulp is 20-30:70-80.
Preferably, the adhesive is one or more of carboxylated styrene-butadiene latex, styrene-acrylic latex and PVAC latex.
Preferably, the raw paper layer further comprises a lining, and the lining adopts 100% broad-leaved wood bleached sulfate pulp.
In a second aspect, the preparation method of the plastic-absorbing white cardboard suitable for printing narrow-edge plastic absorption in large quantities in the field is disclosed, which specifically comprises the following steps: 1) Preparing a top coating layer, a precoating coating layer material and a sizing agent: respectively stirring and uniformly mixing the raw materials of a top coating layer, a precoating coating layer and a surface sizing layer, wherein the top coating layer comprises the following raw materials in parts by weight: the pigment comprises 40-60 parts of needle-shaped or rod-shaped light calcium carbonate and 60-40 parts of calcined soil, and the total part is 100; the adhesive adopts synthetic latex, the absolute dry dosage of the adhesive is 15-20 parts, and the adhesive also comprises 1-2 parts of aqueous polyurethane; the precoating coating layer comprises the following raw materials in parts by weight: the pigment composition comprises 60-80 parts of calcium carbonate, 40-20 parts of calcined soil and 100 parts of total pigment; the adhesive adopts synthetic latex, the absolute dry dosage of the adhesive is 15-20 parts, and the surface sizing layer adopts a mixture of 60-80 parts by weight of enzyme converted starch and 20-40 parts by weight of spherical light calcium carbonate as a sizing agent; preparing a top coating, a precoating coating and a sizing agent for later use;
2) Preparing raw paper layer slurry:
Broad-leaved wood bleached kraft pulp: the required pulp board (about 10% of air-dried water) is crushed into pulp with the concentration of 3-5% by a hydropulper, and the pulp is ground to the freeness of 350-450 ml.csf by a beating machine after passing through a heavy slag remover, and is conveyed to a pulp storage tower for standby; needle wood bleached kraft pulp: the required pulp board (about 10% of air-dried moisture) is crushed into pulp with the concentration of 3-5% by a hydropulper, and the pulp is ground to the freeness of 380-450 ml.csf by a beating machine after passing through a heavy slag remover, and is conveyed to a pulp storage tower for standby.
The surface fiber layer pulp is 100% bleached sulfate hardwood pulp, which is conveyed to a mixed pulp pond from a pulp storage tower and then to a paper machine pulp pond, diluted to 0.2-0.5% concentration by white water, enters a surface layer pulp box after being purified, deslagged and degassed, and is then sprayed on a forming net to form a surface fiber layer; the broad-leaved wood bleached chemical thermal mill mechanical pulp of the core fiber layer and the broke of the paper machine enter a mixed pulp pond according to a proportion and are mixed uniformly, then are conveyed to the paper machine pulp pond, are added with a certain amount of cationic starch and dry strength agent, are diluted to 0.8-1.5% concentration by white water, enter a core pulp box after being purified, deslagged and degassed, and are then sprayed on a forming screen to form the core fiber layer; the bottom fiber layer pulp is 70-80% bleached sulfate hardwood pulp and 20-30% bleached sulfate softwood pulp which are proportionally conveyed from a pulp storage tower to a mixing pulp pool for uniform mixing, then conveyed to a paper machine pulp pool, diluted to 0.2-0.5% concentration by white water, screened, purified and degassed, then enters a bottom layer pulp box, and then is sprayed on a forming net to form a bottom fiber layer;
3) The method comprises the steps of firstly compounding a surface layer fiber layer and a core layer fiber layer at a paper machine net part, then compounding the surface layer fiber layer and a bottom layer fiber layer to form a raw paper layer, then squeezing the raw paper layer to enable the dryness of a paper sheet to reach 48-50%, then entering a pre-drying cylinder area for drying, entering a sizing working section when the water content reaches 7-8%, adopting film transfer sizing, controlling the sizing amount to be 0-0.5g/m 2, when the sizing machine is disconnected, enabling the sizing amount to be 0, entering a post-drying cylinder area, drying the sizing layer, then enabling the sizing layer to pass through a hard calender, finishing the surface, entering a coating working section, firstly coating the prepared precoating paint through a scraper according to the coating amount of 10-12g/m 2, drying the precoating paint through an infrared dryer, then enabling the top coating paint to be coated on the precoating paint according to the coating amount of 10-12g/m 2 through the scraper, entering a soft calender for finishing the surface after infrared drying, and finally winding and then carrying out plastic-absorbing white cardboard.
Film transfer coating: the film transfer sizing machine forms a layer of sizing material film on the sizing roller through a metering rod, a certain pressure exists between the upper sizing roller and the lower sizing roller, and sizing material can be taken away when a paper web passes through the upper sizing roller and the lower sizing roller, so that the sizing process is completed. Sizing films with different thicknesses can be formed by adjusting the grooves of the metering rod, the rod pressure and the sizing agent concentration, and the sizing amount can be controlled.
Preferably, the surface size layer has a sizing amount of 0-0.5g/m 2.
In the third aspect, the plastic-absorbing package suitable for preparing the plastic-absorbing white cardboard by printing the narrow-side plastic absorbing in large quantities on the spot comprises the plastic-absorbing white cardboard, an ink layer, a plastic-absorbing oil layer and a plastic bubble shell from bottom to top.
The invention relates to a plastic package, which is characterized in that a plastic blister shell and a white cardboard are torn by hands to see whether a breaking layer occurs on a fiber layer in a raw paper layer, and the breaking must occur on the layer with the lowest strength according to a basic principle.
Compared with the prior art, the invention has the following beneficial effects:
The invention controls the components and proportion of the coating layer in the plastic-absorbing white cardboard, the raw materials and proportion of each fiber layer in the raw paper layer and the surface sizing amount, so that the white cardboard has plastic absorption property, and the plastic-absorbing package is prepared by using the plastic-absorbing white cardboard, thereby solving the problems that the field ink, the water-based plastic-absorbing oil, the PET material bubble shell and the plastic-absorbing heating time are less than 2S, and the tearing area is not more than 90%, and obtaining good economic benefit and social benefit.
Drawings
Fig. 1 is a schematic view of the structure of the blister pack of the present invention.
FIG. 2 is a graphical representation of the successful suction results of the present invention.
FIG. 3 is a schematic representation of the air permeability of the coating layers of inventive example 1, comparative examples 1-3.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which are obtained by those skilled in the art without making any inventive effort, based on the embodiments of the present invention are intended to fall within the scope of the present invention, and the schemes not described in detail in the present invention are conventional in the art, and conventional methods in the art are adopted.
A plastic-absorbing white cardboard suitable for printing narrow-side plastic absorption in large quantities on the spot comprises a coating layer, a surface sizing layer and a raw paper layer from top to bottom in sequence;
The coating layer comprises a top coating layer and a precoating coating layer;
the top-coat paint layer comprises the following raw materials in parts by weight: the pigment comprises 40-60 parts of needle-shaped or rod-shaped light calcium carbonate and 60-40 parts of calcined soil, and the total part is 100; the adhesive adopts synthetic latex, the absolute dry dosage of the adhesive is 15-20 parts, and the adhesive also comprises 1-2 parts of aqueous polyurethane;
the precoating coating layer comprises the following raw materials in parts by weight: the pigment composition comprises 60-80 parts of 60-grade calcium carbonate, 40-20 parts of calcined soil and 100 parts of total pigment; the adhesive adopts synthetic latex, the absolute dry dosage of the adhesive is 15-20 parts, and the adhesive is one or more of carboxyl styrene-butadiene latex, styrene-acrylic latex and PVAC latex;
The surface sizing layer adopts a mixture of 60-80 parts by weight of enzyme converted starch and 20-40 parts by weight of spherical light calcium carbonate as sizing agent, and is coated on the surface of base paper through film transfer;
the raw paper layer comprises a surface layer fiber layer, a core layer fiber layer and a bottom layer fiber layer;
The surface layer fiber layer adopts 100% hardwood bleached sulfate pulp, the core layer fiber layer adopts hardwood bleached chemi-thermomechanical pulp and paper machine broke, and the weight ratio of the hardwood bleached chemi-thermomechanical pulp to the paper machine broke is 60-70:30-40; the bottom fiber layer adopts needle wood bleached sulfate pulp and broad wood bleached sulfate pulp, the weight ratio of the needle wood bleached sulfate pulp to the broad wood bleached sulfate pulp is 20-30:70-80, the raw paper layer also comprises a lining, and the lining adopts 100% broad wood bleached sulfate pulp.
Example 1
A plastic-absorbing white cardboard suitable for printing narrow-side plastic absorption in large quantities on the spot comprises a coating layer, a surface sizing layer and a raw paper layer from top to bottom in sequence;
The coating layer comprises a top coating layer and a precoating coating layer;
The top-coat paint layer comprises the following raw materials in parts by weight: the pigment comprises 60 parts of needle-shaped light calcium carbonate PCC and 40 parts of calcined clay, wherein the proportion of the particle diameter of less than 2.0 mu m is 95.01%; the adhesive adopts 12 parts of synthetic latex carboxyl styrene-butadiene latex and 3 parts of PVAC latex, and also comprises 1 part of aqueous polyurethane with the model number U54 manufactured by Bayer (China) Limited company.
The precoating coating layer comprises the following raw materials in parts by weight: the pigment composition comprises 80 parts of 60-grade calcium carbonate and 20 parts of calcined soil; the adhesive adopts 12 parts of synthetic latex carboxyl styrene-butadiene latex and 4 parts of PVAC latex;
The surface sizing layer adopts a mixture of 60 parts by weight of enzyme converted starch and 40 parts by weight of spherical light calcium carbonate as a sizing agent, and is coated on the surface of base paper through film transfer, wherein the sizing amount is 0.5g/m 2.
The raw paper layer comprises a surface layer fiber layer, a core layer fiber layer and a bottom layer fiber layer;
The surface layer fiber layer adopts 100% hardwood bleached sulfate pulp, the core layer fiber layer adopts hardwood bleached chemi-thermomechanical pulp and paper machine broke, and the weight ratio of the hardwood bleached chemi-thermomechanical pulp to the paper machine broke is 60:40; the bottom fiber layer adopts needle wood bleached sulfate pulp and broad wood bleached sulfate pulp, the weight ratio of the needle wood bleached sulfate pulp to the broad wood bleached sulfate pulp is 20:80, the raw paper layer also comprises a lining, and the lining adopts 100% broad wood bleached sulfate pulp.
The invention discloses a preparation method of a plastic-absorbing white cardboard suitable for printing narrow-side plastic absorption in large quantities in the field, which comprises the following steps:
1) Preparing a top coating layer, a precoating coating layer material and a sizing agent: respectively stirring and uniformly mixing the raw materials of the top coating layer, the precoating coating layer and the surface sizing layer according to the raw material proportion of the top coating layer, the precoating coating layer and the surface sizing layer to prepare the top coating, the precoating coating and the sizing agent for later use;
2) Preparing raw paper layer slurry:
Broad-leaved wood bleached kraft pulp: the required pulp board (about 10% of air-dried water) is crushed into pulp with the concentration of 3% by a hydropulper, and the pulp is ground to the freeness of 350ml & csf by a pulping machine after passing through a heavy slag remover, and is conveyed to a pulp storage tower for standby; the needle wood is bleached into sulfate pulp, a required pulp board (with about 10% of air-dried moisture) is crushed into pulp with the concentration of 3% by a hydropulper, and the pulp is ground to the freeness of 380 ml/csf by a pulping machine after passing through a heavy slag remover, and is conveyed to a pulp storage tower for standby.
The surface fiber layer pulp is 100% bleached sulfate hardwood pulp, which is conveyed to a mixed pulp pond from a pulp storage tower and then to a paper machine pulp pond, diluted to 0.2% mass concentration by white water, enters a surface layer pulp box after being purified, deslagged and degassed, and is then sprayed on a forming net to form a surface fiber layer; the broad-leaved wood bleached chemical thermal mill mechanical pulp of the core fiber layer and the broke of the paper machine enter a mixed pulp pond according to the proportion of 60 percent to 40 percent for uniform mixing, then are conveyed to the paper machine pulp pond, cationic starch and a dry strength agent are added for improving the strength, the strength is diluted to 0.8 percent concentration by white water, and the mixture enters a core pulp box after being purified, deslagged and deaerated and then is sprayed on a forming screen to form the core fiber layer; the bottom fiber layer pulp is 80% bleached sulfate hardwood pulp and 20% bleached sulfate softwood pulp which are proportionally conveyed from a pulp storage tower to a mixing pulp tank for uniform mixing, then conveyed to a paper machine pulp tank, diluted to 0.2% concentration by white water, screened, purified and degassed, then enters a bottom pulp box, and then is sprayed on a forming net to form a bottom fiber layer;
3) The method comprises the steps of firstly compounding a surface fiber layer and a core fiber layer at a paper machine net part, then compounding the surface fiber layer and the bottom fiber layer to form a raw paper layer, then squeezing the raw paper layer to enable the dryness of a paper sheet to reach 48%, then entering a pre-drying cylinder area for drying, entering a sizing working section when the water content reaches 7%, adopting film transfer sizing, controlling the sizing amount to be 0.5g/m 2, when the sizing machine is disconnected, enabling the sizing amount to be 0, then entering an after-drying cylinder area for drying the sizing layer, then enabling the sizing layer to pass through a hard calender, finishing the surface, then entering a coating working section, firstly coating the prepared pre-coating according to the coating amount of 10g/m 2 through a scraper, drying the pre-coating according to the coating amount of 10g/m 2 through an infrared dryer, entering a soft calender for finishing the surface after infrared drying, and finally coiling and cutting to obtain the plastic white cardboard.
The bonding strength of the raw paper layer is 150J/m 2, and the bonding strength of the blister shell layer to the surface adhesive layer is 250J/m 2.
Comparative example 1
Comparative example 1a white cardboard was prepared, differing from example 1 in that the top coating layer of comparative example 1 comprises the following raw materials in parts by weight: 54 parts of 91-grade calcium carbonate, 6 parts of 60-grade calcium carbonate, 20 parts of porcelain clay and 20 parts of calcined clay, 15 parts of carboxyl styrene-butadiene latex, and 89.29 percent of calcium carbonate with the particle size smaller than 2.0 mu m;
The precoating coating layer comprises the following raw materials in parts by weight: 80 parts of 60-grade calcium carbonate and 20 parts of calcined clay; the adhesive adopts synthetic latex carboxyl styrene-butadiene latex, and the absolute dry dosage of the adhesive is 16 parts.
The sizing amount of the surface sizing layer is 1.2g/m 2;
The surface fiber layer adopts 80 parts of broad-leaved bleached sulfate pulp and 20 parts of bleached sulfate softwood pulp.
The bonding strength of the raw paper layer is 300J/m 2, and the bonding strength of the blister shell layer to the surface adhesive layer is 250J/m 2.
Comparative example 2
Comparative example 2a white cardboard was prepared, differing from example 1 in that the top coating of comparative example 2 comprises the following raw materials in parts by weight: 42 parts of 91-grade calcium carbonate, 18 parts of 60-grade calcium carbonate, 20 parts of porcelain clay and 20 parts of calcined clay, 15 parts of carboxyl styrene-butadiene latex, wherein the proportion of calcium carbonate with the particle size smaller than 2.0 mu m is 81.06%;
The precoating coating layer comprises the following raw materials in parts by weight: 80 parts of 60-grade calcium carbonate and 20 parts of calcined clay; the adhesive adopts synthetic latex carboxyl styrene-butadiene latex, and the absolute dry dosage of the adhesive is 16 parts.
The sizing amount of the surface sizing layer is 1.2g/m 2;
The surface fiber layer adopts 80 parts of broad-leaved bleached sulfate pulp and 20 parts of bleached sulfate softwood pulp.
The bonding strength of the raw paper layer is 280J/m 2, and the bonding strength of the blister shell layer to the surface adhesive layer is 260J/m 2.
Comparative example 3
Comparative example 3a white cardboard was prepared, differing from example 1 in that the top coating layer of comparative example 3 comprises the following raw materials in parts by weight: 30 parts of 91-grade calcium carbonate, 30 parts of 60-grade calcium carbonate, 20 parts of porcelain clay and 20 parts of calcined clay, 15 parts of carboxyl styrene-butadiene latex, wherein the proportion of calcium carbonate with the particle size smaller than 2.0 mu m is 74.61%;
The precoating coating layer comprises the following raw materials in parts by weight: 80 parts of 60-grade calcium carbonate and 20 parts of calcined clay; the adhesive adopts synthetic latex carboxyl styrene-butadiene latex, and the absolute dry dosage of the adhesive is 16 parts.
The sizing amount of the surface sizing layer is 1.2g/m 2;
The surface fiber layer adopts 80 parts of broad-leaved bleached sulfate pulp and 20 parts of bleached sulfate softwood pulp.
The bonding strength of the raw paper layer is 270J/m 2, and the bonding strength of the blister shell layer to the surface adhesive layer is 265J/m 2.
The white cardboard prepared in example 1 and comparative examples 1 to 3 was prepared into a blister pack by the following specific preparation method:
Printing on the surfaces of the white cardboard prepared in the example 1 and the comparative examples 1-3 by using a Heidelberg printer, coating water-based/oil-based plastic absorbing oil on a rubber roller, coating the water-based/oil-based plastic absorbing oil with a coating weight of 2.5g/m 2, covering a PET/PVC material bubble shell according to the shape of a mould, heating the plastic absorbing oil to melt at 150 ℃, and bonding the paper and the plastic bubble shell together under a pressure of 4kg for 1.8s to form the plastic absorbing package.
The determination of the blister grade was carried out on blister packages prepared using the white cardboard prepared in example 1 and comparative examples 1 to 3, and the test results are shown in table 1.
TABLE 1 determination of raw materials and blister grades in example 1 and comparative examples 1-3
It should be noted that the 3-level plastic suction effect represents that the fiber pulling area accounts for 30-60%; level 4 represents a pull-apart fiber area ratio of 60-90%; scale 5 represents a pull-apart fiber area ratio of greater than 90%.
As shown in FIG. 1, the air permeability of the coating layers in example 1 and comparative examples 1-3 is measured, and it can be seen from FIG. 1 that the air permeability of the coating layer in example 1 is obviously improved compared with that in comparative examples 1-3, and the obvious improvement of the air permeability of the coating layer is also an important factor for improving the plastic sucking effect.
The invention controls the components and proportion of the coating layer in the plastic-absorbing white cardboard, the raw materials and proportion of each fiber layer in the raw paper layer and the surface sizing amount, so that the white cardboard has plastic absorption property, and the plastic-absorbing package is prepared by using the plastic-absorbing white cardboard, thereby solving the problems that the field ink, the water-based plastic-absorbing oil, the PET material bubble shell and the plastic-absorbing heating time are less than 2S, and the tearing area is not more than 90%, and obtaining good economic benefit and social benefit.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions for embodiments of the invention may be made by those skilled in the art without departing from the spirit and scope of the invention, and these modifications and substitutions are intended to be within the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (6)
1. A plastic-absorbing white cardboard suitable for printing narrow edges in large quantities on the spot is characterized in that a coating layer, a surface sizing layer and a raw paper layer are sequentially arranged from top to bottom;
The coating layer comprises a top coating layer and a precoating coating layer;
the top-coat paint layer comprises the following raw materials in parts by weight: the pigment comprises 40-60 parts of needle-shaped or rod-shaped light calcium carbonate and 60-40 parts of calcined soil, and the total part is 100; the adhesive adopts synthetic latex, the absolute dry dosage of the adhesive is 15-20 parts, and the adhesive also comprises 1-2 parts of aqueous polyurethane;
the precoating coating layer comprises the following raw materials in parts by weight: the pigment composition comprises 60-80 parts of calcium carbonate, 40-20 parts of calcined soil and 100 parts of total pigment; the adhesive adopts synthetic latex, and the absolute dry dosage of the adhesive is 15-20 parts;
The surface sizing layer adopts a mixture of 60-80 parts by weight of enzyme converted starch and 20-40 parts by weight of spherical light calcium carbonate as sizing agent, and is coated on the surface of base paper through film transfer;
the raw paper layer comprises a surface layer fiber layer, a core layer fiber layer and a bottom layer fiber layer;
The surface layer fiber layer adopts 100% hardwood bleached sulfate pulp, the core layer fiber layer adopts hardwood bleached chemi-thermomechanical pulp and paper machine broke, and the weight ratio of the hardwood bleached chemi-thermomechanical pulp to the paper machine broke is 60-70:30-40; the bottom fiber layer adopts needle wood bleached sulfate pulp and broad wood bleached sulfate pulp, and the weight ratio of the needle wood bleached sulfate pulp to the broad wood bleached sulfate pulp is 20-30:70-80.
2. The plastic-absorbing white cardboard suitable for in-situ high-ink printing narrow-side plastic absorption according to claim 1, wherein the adhesive is one or more of carboxylic styrene-butadiene latex, styrene-acrylic latex and PVAC latex.
3. The plastic-absorbing white cardboard suitable for mass-printing narrow edges in the field according to claim 1, wherein the raw paper layer further comprises a lining layer, and the lining layer adopts 100% broad-leaved wood bleached kraft pulp.
4. A method for preparing a plastic-absorbing white cardboard suitable for in-situ high-ink printing narrow-edge plastic absorption as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
1) Preparing a top coating layer, a precoating coating layer material and a sizing agent: respectively stirring and uniformly mixing the raw materials of the top coating layer, the precoating coating layer and the surface sizing layer to prepare a top coating, a precoating coating and a sizing agent for later use;
2) Preparing raw paper layer slurry: the surface fiber layer pulp is 100% bleached sulfate hardwood pulp, which is conveyed to a mixed pulp pond from a pulp storage tower and then to a paper machine pulp pond, diluted to 0.2-0.5% concentration by white water, enters a surface layer pulp box after being purified, deslagged and degassed, and is then sprayed on a forming net to form a surface fiber layer; the broad-leaved wood bleached chemical thermal mill mechanical pulp of the core fiber layer and the broke of the paper machine enter a mixed pulp pond according to a proportion and are mixed uniformly, then are conveyed to the paper machine pulp pond, are added with a certain amount of cationic starch and dry strength agent, are diluted to 0.8-1.5% concentration by white water, enter a core pulp box after being purified, deslagged and degassed, and are then sprayed on a forming screen to form the core fiber layer; the bottom fiber layer pulp is 70-80% bleached sulfate hardwood pulp and 20-30% bleached sulfate softwood pulp which are proportionally conveyed from a pulp storage tower to a mixing pulp pool for uniform mixing, then conveyed to a paper machine pulp pool, diluted to 0.2-0.5% concentration by white water, screened, purified and degassed, then enters a bottom layer pulp box, and then is sprayed on a forming net to form a bottom fiber layer;
3) The method comprises the steps of firstly compounding a surface layer fiber layer and a core layer fiber layer at a paper machine net part, then compounding the surface layer fiber layer and a bottom layer fiber layer to form a raw paper layer, then squeezing the raw paper layer to enable the dryness of paper sheets to reach 48-50%, then entering a front drying cylinder area for drying, entering a sizing working section when the water content reaches 7-8%, adopting film transfer sizing, controlling the sizing amount to be 0-0.5g/m 2, entering a rear drying cylinder area for drying the sizing layer, then finishing the surface by a hard calender, entering a coating working section, firstly coating the prepared precoating coating according to the coating amount of 10-12g/m 2 by a scraper, drying by an infrared dryer, then coating the precoating coating according to the coating amount of 10-12g/m 2 by the scraper, entering a soft calender for finishing the surface after infrared drying, and finally coiling and cutting to obtain the plastic white cardboard.
5. The method for preparing a white cardboard suitable for in-situ high-ink printing and narrow-side suction molding according to claim 4, wherein the sizing amount of the surface sizing layer is 0-0.5g/m 2.
6. A blister package prepared using a blister card suitable for in-situ high-volume printing of narrow-sided blister according to any one of claims 1 to 3, comprising, from bottom to top, a blister card, an ink layer, a blister oil layer and a plastic blister.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117926637A true CN117926637A (en) | 2024-04-26 |
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