CN112160182B - Pizza box facial tissue and preparation method thereof - Google Patents
Pizza box facial tissue and preparation method thereof Download PDFInfo
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- CN112160182B CN112160182B CN202011041781.0A CN202011041781A CN112160182B CN 112160182 B CN112160182 B CN 112160182B CN 202011041781 A CN202011041781 A CN 202011041781A CN 112160182 B CN112160182 B CN 112160182B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- 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
- D21H19/00—Coated paper; Coating material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention provides pizza box facial tissue and a preparation method thereof, wherein the method comprises the following steps: s1, pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp to 44-48 DEG SR, 28-32 DEG SR and 38-42 DEG SR respectively, and preparing pulp: 30-40% of bleached sulfate softwood chemical pulp, 30-40% of bleached sulfate hardwood chemical pulp and 20-40% of hydrogen peroxide bleached disc mill mechanical pulp; s2, adding auxiliary materials after the pulp is prepared, and making to obtain wet paper; s3, drying, coating and other treatments are carried out on the wet paper to obtain pizza box surface paper; the coating adopted by the coating comprises a food-grade adhesive. The product prepared by the method is smooth and fine, the paper surface gloss is low, the printing gloss is high, the printing color reduction degree is high, the stiffness and the surface strength are good, and the dust degree is low. The product of the invention is used as the face paper of the pizza package box, and has good printing effect.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to pizza box surface paper and a preparation method thereof.
Background
With the improvement of the national living standard of China, the consumption of pizza in China is greatly increased, and the consumption of paper for pizza boxes is also correspondingly greatly increased. The quantitative range of the surface use of the pizza box paper is 55-60g/m 2 The white food packaging paper is used as the face paper of the pizza box.
At present, domestic pizza paper customers generally consider that the printing effect of imported products is poor, and the severity of the printing effect even influences the purchase willingness of end users.
Disclosure of Invention
Aiming at the problems in the existing papermaking printing, the invention aims to provide pizza box surface paper and a preparation method thereof.
The invention provides a preparation method of pizza box facial tissue, which comprises the following steps:
s1, pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp to 44-48 DEG SR, 28-32 DEG SR and 38-42 DEG SR respectively, and preparing pulp according to the mass percentage: 30-40% of bleached sulfate softwood chemical pulp, 30-40% of bleached sulfate hardwood chemical pulp and 20-40% of hydrogen peroxide bleached disc mill mechanical pulp;
s2, adding auxiliary materials after the pulp is prepared, and making to obtain wet paper;
s3, sequentially carrying out pre-drying, coating, post-drying and calendaring on the wet paper to obtain the facial tissue of the pizza box; the coating adopted by the coating comprises a food-grade adhesive.
Preferably, the blending concentration of the slurry obtained by blending slurry is 2.8-3.2%; the auxiliary material comprises a polyacrylamide reinforcing agent, and a concrete addition point is a pump inlet of a pulping tank; the dosage of the polyacrylamide reinforcing agent accounts for 2-4% of the weight of the paper.
Preferably, the auxiliary materials include, relative to the amount of oven dried pulp: 1.5-2.5% by weight of an alkyl ketene dimer; 10-15% by weight of a filler; 1.0-2.0% by weight of cationic starch; 0.03-0.08% by weight of cationic polyacrylamide; 0.2-0.5% by weight of bentonite.
Preferably, the paper making specifically comprises: and sequentially carrying out thick pulp screening, seasoning, pulp washing, sand and gas removal, sizing, fine screening, net part dehydration forming and squeezing to obtain the squeezed wet paper.
Preferably, in the coating, the food-grade adhesive comprises food-grade polyvinyl acetate and low-viscosity polyvinyl alcohol, and the amount of the food-grade polyvinyl acetate is more than that of the low-viscosity polyvinyl alcohol; the low-viscosity polyvinyl alcohol has the viscosity of 15-25mPa.s at 25 ℃ and the solid content of 10%.
Preferably, the coating comprises a platy china clay and nanoscale silica; the radius-thickness ratio of the flaky porcelain clay is between 30 and 60.
Preferably, the coating specifically comprises the following components in parts by weight: 5-10 parts of nano-silicon dioxide; 90-95 parts of flaky porcelain clay; 4-10 parts of coating starch; 15-20 parts of food-grade polyvinyl acetate; 3-6 parts of low-viscosity polyvinyl alcohol; 0.5-2.5 parts of a lubricant; 0.5-1.5 parts of water repellent agent.
Preferably, the solid content of the coating is 5-10%, and the coating weight is 6-10g/m 2 。
The invention provides pizza box facial tissue obtained by the preparation method, and the quantitative ratio is 55-60g/m 2 The whiteness ISO is 84-86%, the opacity is 86-88%, and the bulk is more than 1.25cm 3 A surface absorption weight of less than 35g/m 2 The longitudinal fracture length is larger than 4500m, the smoothness is larger than 40s, the longitudinal stiffness is larger than 65mN, the paper surface glossiness is smaller than 5%, the printing glossiness is larger than 25%, and the surface strength is larger than 1.0m/s.
The preparation method of the pizza box facial tissue provided by the invention comprises the following steps: the bleached sulfate softwood chemical pulp, the bleached sulfate hardwood chemical pulp and the hydrogen peroxide bleached disc mill mechanical pulp are used as fiber raw materials to be matched and copied, and in the specific operation of matching and copying, the mass percentages of the bleached sulfate softwood chemical pulp, the bleached sulfate hardwood chemical pulp and the hydrogen peroxide bleached disc mill mechanical pulp are 30-40%, 30-40% and 20-40% in sequence; the beating degrees are respectively 44-48 degrees SR, 28-32 degrees SR and 38-42 degrees SR; and then, the food packaging paper used as the pizza box facial tissue is obtained through the process steps of coating, calendaring and the like. The product prepared by the method is smooth and fine, the paper surface gloss is low and not dazzling, the printing gloss is high, the printing color reduction degree is high, the stiffness and the surface strength are good, the dust degree is low, the machine passing performance is excellent, the printing is exquisite, the requirements of flexible printing can be met, and simultaneously the hygienic standard of GB11680 national food paper is met. The product of the invention is used as the face paper of the pizza package box, has good printing effect, and has great significance for improving the profit level of enterprises and the image of the enterprises.
Drawings
FIG. 1 is a diagram showing the printing effect of the product obtained in example 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides a preparation method of pizza box facial tissue, which comprises the following steps:
s1, pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp to 44-48 DEG SR, 28-32 DEG SR and 38-42 DEG SR respectively, and preparing pulp according to the mass percentage: 30-40% of bleached sulfate softwood chemical pulp, 30-40% of bleached sulfate hardwood chemical pulp and 20-40% of hydrogen peroxide bleached disc mill mechanical pulp;
s2, adding auxiliary materials after the pulp is prepared, and making to obtain wet paper;
s3, sequentially carrying out front drying, coating, rear drying and press polishing on the wet paper to obtain pizza box facial tissue; the coating adopted by the coating comprises a food-grade adhesive.
The pizza box facial tissue prepared by the invention has the characteristics of smoothness, fineness, high printing glossiness, high printing color reduction degree, good stiffness, low dust degree and the like, is used as the pizza box facial tissue and other products, and has better printing effect.
The embodiment of the invention takes bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp as fiber raw materials, and the raw materials are respectively pulped to 44-48 DEG SR, 28-32 DEG SR and 38-42 DEG SR.
Wood pulp is generally classified according to the pulp material, the pulping method, the use, and the like, and chemical pulp such as kraft softwood pulp, mechanical wood pulp, chemimechanical wood pulp, refined wood pulp, and the like are exemplified. The softwood pulp chemical pulp and the hardwood chemical pulp used in the invention respectively take softwood (such as pine wood) and hardwood (including eucalyptus, poplar, birch and the like) as raw materials, and pulp is prepared by chemically pulping and bleaching through sulfate and only needs to adopt pulp commonly used in the field; the hydrogen peroxide bleaching disc mill mechanical pulp belongs to mechanical wood pulp and is subjected to hydrogen peroxide bleaching treatment.
In the pulp proportioning of the embodiment of the invention, the hardwood chemical pulp and the softwood chemical pulp are both 30-40 percent, namely the total chemical pulp is 60-80 percent. The reasons for the scheme of the invention adopting more chemical pulp include: the chemical pulp basically removes lignin, mainly contains cellulose and hemicellulose, the mechanical pulp retains most of the lignin, and the chemical pulp has higher strength and is beneficial to ensuring the good strength of paper. In addition, the chemical pulp of softwood is long fiber, and compared with the chemical pulp of hardwood and APMP or CTMP pulp of short fiber, the chemical pulp of hardwood has higher strength after pulping, and further makes the paper have good strength.
Meanwhile, after the proportioning of the sizing agent is determined, the performance of the paper product, such as strength, smoothness, bulk, printing performance and the like, is directly determined by whether the sizing agent beating degree is proper or not. The paper properties largely depend on the quality of beating; the physical properties, structural forms and chemical compositions of the fibers of different types of pulp are different, and the difficulty degree of pulping and the properties of finished paper are also different greatly. The pulp is pulped, so that on one hand, the binding force of the fibers is increased, and meanwhile, the average length of the fibers is reduced. It can increase the tensile strength, bursting strength and folding strength of paper, and increase the smoothness, stiffness and tightness of paper, but reduce the tearing strength and opacity of finished paper, and increase the shrinkage of paper. With the pulping, the binding force of the pulp fiber is continuously increased, and the average fiber length is continuously reduced.
The broadleaf wood chemical pulp and the softwood chemical pulp adopted by the preparation of the pizza box facial tissue have beating degrees of 28-32 DEG SR and 44-48 DEG SR respectively; the hardwood chemical pulp is beaten lower mainly for obtaining good paper bulk to obtain higher thickness and stiffness. The softwood chemical pulp adopted by the paper has higher beating degree, and is mainly used for ensuring the strength of the paper, particularly the fracture length. And the beating degree of the hydrogen peroxide bleaching disc mill mechanical pulp is 38-42 DEG SR.
After the pulp is prepared, the mixed pulp can be prepared to have the concentration of 2.8-3.2%, and then auxiliary materials are added into a sizing system to carry out wet-sheet paper making. Wherein, the addition of the auxiliary materials mainly meets the requirements of paper application and is generally various non-fibrous substances; the auxiliary materials comprise a sizing agent, a filler, a reinforcing agent, a retention aid, a water repellent agent and the like. Specifically, the sizing agent is preferably an alkyl ketene dimer; the filler may be calcium carbonate. The retention aid can be polyacrylamide, preferably cationic PAM, and is beneficial to reducing the loss of filler and fine fibers in the papermaking process. The reinforcing agent is preferably polyacrylamide reinforcing agent, more preferably modified PAM (polyacrylamide), and is favorable for ensuring good paper stiffness.
In an embodiment of the present invention, the auxiliary materials include: the adhesive comprises a sizing agent alkyl ketene dimer, a calcium carbonate filler, cationic starch, a retention aid cationic polyacrylamide, a modified polyacrylamide reinforcing agent and bentonite. Wherein the dosage of the modified PAM intensifier accounts for 2 to 4 percent of the weight of the paper; the concrete adding point is the pump inlet of the pulping tank.
In addition, the dosage of the auxiliary materials added in other various kinds of pulp to oven-dried pulp is as follows: the weight ratio of the alkyl ketene dimer of the sizing agent is 1.5-2.5%; 10-15% of filler by weight; the weight ratio of the cationic starch is 1.0-2.0%; the weight ratio of the retention aid cationic polyacrylamide is 0.03-0.08%; the weight ratio of bentonite is 0.2-0.5%.
The embodiment of the invention obtains the pressed wet paper sequentially through thick liquid screening, seasoning, pulp washing, desanding and degassing, sizing, fine screening, net part dehydration forming and pressing. Paper machines generally consist of two parts, a wet end, which includes a headbox (i.e., headbox), a wire section and a press section; the dry section includes a drying section, a calender section, and a winder. The various operating processes of wet papermaking in the present application are well known to those skilled in the art and are not specifically claimed herein. In the embodiment of the invention, the wet paper leaves the wire part and enters the press part for five-roll three-press combined pressing until the dryness is more than or equal to 39 percent.
Then, the embodiment of the invention enters a front drying part, the surface temperature of the drying cylinder is preferably controlled to be 90-130 ℃, and the paper sheet is dried until the dryness of the paper sheet is more than or equal to 95 percent; the reverse side of the paper sheet entering from the front drying part is coated by the coating unit, and then the post-drying is continued.
According to the embodiment of the invention, the coating is coated in the coating unit, and in order to ensure the printing effect and the like, the food-grade adhesive is used as the coating. The food grade adhesive preferably comprises food grade polyvinyl acetate in an amount greater than the low viscosity polyvinyl alcohol and low viscosity polyvinyl alcohol. According to the embodiment of the invention, the food-grade adhesive polyvinyl acetate is used as a main adhesive, the adhesive has a three-dimensional structure, so that water in the ink can quickly enter the paper during printing of the water-based ink, and ink particle components are remained on the surface, so that the printing effect is ensured, the drying speed of the printing ink is ensured, and the smearing is prevented.
In the coating of the embodiment of the invention, a small amount of low-viscosity PVA (10% of solid content at 25 ℃ and 15-25mPa.s of viscosity) is used as an adhesive, and the surface strength and the stiffness are mainly improved; meanwhile, a small amount of PVA is added, and the low viscosity characteristic of the PVA can prevent the problems of uneven coating and poor running performance caused by overlarge viscosity of the coating.
Further, the coating comprises flaky porcelain clay with the radius-thickness ratio of 30-60. The invention preferably adopts the flaky porcelain clay with high diameter-thickness ratio (between 30 and 60), has strong covering power, can effectively improve the printing glossiness, and in addition, the median particle size of the porcelain clay is about 2 to 2.5 microns (the median particle size represents the particle size when the particles smaller than the porcelain clay and larger than the porcelain clay respectively account for 50 percent in a sample), the particle size is large, the paper surface gloss is small, thereby meeting the characteristics of high printing glossiness and low paper surface gloss. In addition, the coating of the invention preferably uses nano-scale silicon dioxide as a pigment, has strong adsorption capacity, and can fix the flexographic aqueous ink on the surface of paper as much as possible, thereby improving the printing effect.
In a preferred embodiment of the present invention, the coating specifically comprises, in parts by weight: 5-10 parts of nano-silicon dioxide; 90-95 parts of flaky porcelain clay; 4-10 parts of coating starch; 15-20 parts of food-grade polyvinyl acetate; 3-6 parts of low-viscosity polyvinyl alcohol; 0.5-2.5 parts of a lubricant; 0.5-1.5 parts of water repellent agent. Wherein, 90-95 parts of flaky porcelain clay is the main component of the coating, which is beneficial to improving the printing glossiness. The embodiment of the invention adopts oxidized starch, the content of the protein of the oxidized starch is required to be lower than 0.2 percent in order to ensure the rheological property of the coating, and the effect of the oxidized starch is mainly to adjust the rheological property of the coating, properly tackify and prevent an adhesive from excessively migrating into a paper sheet. The lubricant and the water repellent agent are respectively food-grade calcium stearate and ammonium zirconium carbonate. And, the solid content of the dope is preferably 6 to 10wt%; the viscosity can be 200-400mPa.s (room temperature), and the pH value is 8.0-8.5.
The coating adopting the formula is one of the key technologies in the embodiment of the invention; the coating conditions of the embodiment of the invention include: the glue application amount or coating amount is 6-10g/m 2 (ii) a The linear pressure is 10-30KN/m, the glue applying tension is 200-300N/m, and the loading pressure of the metering rod is 0.8-1.5bar.
In the embodiment of the invention, the drying treatment temperature after coating can be 40-130 ℃, and the dryness of paper sheets in a drying part after the paper sheets are discharged is more than or equal to 93 percent; the paper entering from the rear drying part enters a calendering area, the paper is calendered, curled and packaged, and the quantitative range is 55-60g/m 2 The white food packaging paper is used as the surface paper of the pizza box.
The calendering conditions of the embodiment of the invention comprise: the calender is operated in single-nip mode, the temperature of the hot roll is 40-100 ℃, and the linear pressure is 50-100kN/m. In addition, other parameters of the paper machine include: the screen speed is 800-1000m/min, the pulp screen speed ratio is 1.020-1.028, and the squeezing pressure: 200-300kN/m, two-line pressure: 700-900kN/m, opening degree of the lip: 8.0-11.0mm.
The embodiment of the invention provides pizza box facial tissue obtained by the preparation method, and the quantitative ratio of the pizza box facial tissue is 55-60g/m 2 The whiteness ISO is 84-86%, the opacity is 86-88%, and the bulk is more than 1.25cm 3 A surface absorption weight of less than 35g/m 2 The longitudinal fracture length is larger than 4500m, the smoothness is larger than 40s, the longitudinal stiffness is larger than 65mN, the paper surface glossiness is smaller than 5%, the printing glossiness is larger than 25%, and the surface strength is larger than 1.0m/s. Wherein, the quantification is carried out after the paper is dried (the paper content is less than 10%).
Furthermore, the pizza box facial tissue is the pizza packaging box facial tissue, and is required to reach the GB11680 food paper sanitary standard, and meanwhile, the facial tissue is required to be low in dust degree and exquisite in printing, and can meet the requirements of flexographic printing. Particularly, customers want the surface of the facial tissue not to be dazzling, the glossiness of the surface of the facial tissue is similar to that of the common offset paper, and the printing gloss is good. In addition, the product has higher requirements on paper stiffness and surface strength. In order to meet the requirements of printing and the like, the pizza box facial tissue developed by the invention is the pizza facial tissue with micro-coating, and the product has great significance for improving the profit level of enterprises and improving the image of the enterprises.
For further understanding of the present application, the pizza box top paper and the method for preparing the same provided by the present application will be described in detail below with reference to examples. It should be understood, however, that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the following examples. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by manufacturers, and are all conventional products available on the market.
Example 1:
the production method is characterized in that bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp are used as fiber raw materials to be matched and copied, and the fiber raw materials are subjected to thick pulp screening, seasoning, pulp washing, sand and gas removal, sizing, fine screening, net part dehydration forming, squeezing, front drying, coating, rear drying, calendaring, reeling and packaging to obtain the composite fiber.
The specific operations of the making are as follows: pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp to 45-degree SR, 39-degree SR and 39-degree SR respectively, preparing pulp according to mass percent, and mixing to obtain pulp with the prepared concentration of 2.9 percent, wherein the mass percent is as follows: 35% of bleached sulfate softwood chemical pulp, 35% of bleached sulfate hardwood chemical pulp and 30% of hydrogen peroxide bleached disc mill mechanical pulp.
The modified PAM reinforcing agent is added into the sizing system, the specific addition point is the inlet of a slurry pump of a sizing pond, and the dosage accounts for the weight percentage of paper: 2 percent. The dosage of the auxiliary materials added in other various kinds of pulp to the oven-dried pulp is as follows: (a) 1.6% by weight of alkyl ketene dimer as sizing agent; (b) 11% by weight of filler; (c) 1.1 percent of cationic starch by weight, (d) 0.04 percent of retention aid cationic polyacrylamide by weight, and (e) 0.3 percent of bentonite by weight.
The dryness of the paper sheet in the drying part after the discharge is 94 percent; the conditions of the calendering treatment include: the calender was operated in single-nip mode with a hot-roll temperature of 60 ℃ and a linear pressure of 80kN/m. Other parameters of the paper machine include: the net speed is 850m/min, the pulp net speed ratio is 1.024, and the pressing-pressing pressure is as follows: 245kN/m, two-line pressure: 750kN/m, lip opening: 9.0mm.
Coating the dried paper sheet in a coating unit; the formula of the coating is shown in the following table, wherein oxidized starch is adopted in the embodiment of the invention, and the content of oxidized starch protein is required to be lower than 0.2% in order to ensure the rheological property of the coating; the lubricant and the water repellent agent are respectively food-grade calcium stearate and ammonium zirconium carbonate.
Coating conditions: the line pressure was 12KN/m, the sizing tension was 245N/m, and the metering bar loading pressure was 0.98bar.
TABLE 1 coating formulations and coating Properties
| Formulation and Properties | |
| Silica fine particles part by weight | 6 |
| Flake china clay weight portion | 94 |
| Coating starch weight parts | 5 |
| Polyvinyl acetateParts by weight | 16 |
| Low viscosity PVA parts by weight | 4 |
| Parts by weight of lubricant | 0.5 |
| Water repellent agent weight portion | 0.5 |
| pH value | 8.1 |
| Coating solid content% | 6 |
| Viscosity (mPa.s) | 250 |
| Amount of applied or applied glue g/m 2 | 6 |
The quality of the obtained paper product is as follows: the quantitative determination was 55g/m 2 6.5% moisture, 84.2% whiteness ISO, 86.5% opacity, 1.26cm bulk 3 (iv) g, surface absorption weight 25g/m 2 Longitudinal breaking length 4625m, smoothness 45s, longitudinal stiffness 66mN, paper surface gloss 2.5%, printing gloss 26%, and surface strength greater than 1.01m/s.
Printing effect for example, as shown in fig. 1, the left side is the printing effect of uncoated food paper, and the right side is the printing effect of the food paper of the present invention. The food paper is treated by the surface coating, compared with the common food paper, the printing effect is obviously improved, the image is clearer, the color is more saturated, and the picture is more vivid (as shown in figure 1). Actually, the density (red) of the printed solid on the red pepper on the left image is only 0.63, while the density (red) of the printed solid on the red pepper on the right image reaches 1.25 under the condition that the printing conditions are completely consistent, so that the printing effect is obviously improved (the smaller the density of the printed solid is, the poorer the color reduction effect of the printed solid is).
Example 2:
the production method is characterized in that bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp are used as fiber raw materials to be matched and copied, and the fiber raw materials are subjected to thick pulp screening, seasoning, pulp washing, sand and gas removal, sizing, fine screening, net part dehydration forming, squeezing, front drying, coating, rear drying, calendaring, reeling and packaging to obtain the composite fiber.
The specific operations of the making are as follows: respectively pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc refiner mechanical pulp to 46-degree SR, 40-degree SR and 40-degree SR, preparing pulp according to mass percent, and mixing to obtain pulp with the preparation concentration of 3.0 percent, wherein the mass percent is as follows: 37% of bleached sulfate softwood chemical pulp, 35% of bleached sulfate hardwood chemical pulp and 30% of hydrogen peroxide bleached disc mill mechanical pulp.
The modified PAM reinforcing agent is added into the sizing system, the specific addition point is the inlet of a slurry pump of a sizing pond, and the dosage accounts for the weight percentage of paper: 2.5 percent. The dosage of the auxiliary materials added in other various kinds of pulp to the oven-dried pulp is as follows: (a) 2.0% by weight of alkyl ketene dimer as sizing agent; (b) a filler weight ratio of 12.5%; (c) 1.5 percent of cationic starch, 0.06 percent of retention aid cationic polyacrylamide and 0.3 percent of bentonite.
The calender was operated in single-nip mode with a hot-roll temperature of 70 ℃ and a line pressure of 75kN/m. In addition, other parameters of the paper machine include: the wire speed is 920m/min, the pulp wire speed ratio is 1.025, and the pressing pressure: 270kN/m, two-line pressure: 800kN/m, lip opening: 9.8mm.
Coating the dried paper sheet in a coating unit; the coating formula is as follows:
TABLE 2 coating formulation and coating Properties
| Formulation and Properties | |
| Silica fine particle parts by weight | 7 |
| Weight portion of flaky porcelain clay | 93 |
| Coating starch weight parts | 6 |
| Polyvinyl acetate weight parts | 17 |
| Low viscosity PVA parts by weight | 4.5 |
| Weight parts of lubricant | 0.8 |
| Water resisting agent weight portion | 0.6 |
| pH value of | 8.2 |
| Coating solid content% | 6.5 |
| Viscosity (mPa.s) | 260 |
| Amount of applied or applied glue g/m 2 | 6.5 |
The embodiment of the invention adopts oxidized starch, and in order to ensure the rheological property of the coating, the protein content of the oxidized starch is required to be lower than 0.2%; the lubricant and the water repellent agent are respectively food-grade calcium stearate and ammonium zirconium carbonate.
Coating conditions: line pressure 13KN/m, sizing tension 275N/m, metering rod loading pressure 1.2bar.
The quality of the obtained paper product is as follows: the quantitative determination was 58g/m 2 Water content of 7.0%, whiteness ISO of 84.8%, opacity of 87%, bulk of 1.27cm 3 G, surface absorption weight 28g/m 2 Longitudinal breaking length of 4750m, smoothness of 46s, longitudinal stiffness of 68mN, paper surface glossiness of 3%, printing glossiness of 26.5%, and surface strength of more than 1.02m/s. The printing effect likewise corresponds to that described in example 1.
Example 3:
the bleached sulfate softwood chemical pulp, the bleached sulfate hardwood chemical pulp and the hydrogen peroxide bleached disc mill mechanical pulp are used as fiber raw materials to be matched and copied, and the fiber raw materials are subjected to thick pulp screening, seasoning, pulp flushing, sand and gas removal, sizing, fine screening, net part dehydration forming, squeezing, pre-drying, coating, post-drying, calendaring, reeling and packaging to obtain the composite fiber.
The specific operations of the making are as follows: respectively pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc refiner mechanical pulp to 47 DEG SR, 41 DEG SR and 41 DEG SR, preparing pulp according to mass percent, and mixing to obtain pulp with the preparation concentration of 3.1 percent, wherein the mass percent is as follows: 39% of bleached sulfate softwood chemical pulp, 36% of bleached sulfate hardwood chemical pulp and 25% of hydrogen peroxide bleached millstone mechanical pulp.
The modified PAM reinforcing agent is added into the sizing system, the specific addition point is an inlet of a sizing pond slurry pump, and the dosage accounts for the weight percentage of the paper: 2.8 percent. The dosage of the auxiliary materials added into other various pulps to the oven-dried pulp is as follows: (a) 2.2% by weight of alkyl ketene dimer as sizing agent; (b) 14.8% by weight filler; (c) 1.6 percent of cationic starch, 0.07 percent of retention aid cationic polyacrylamide, and 0.35 percent of bentonite;
the dryness of the paper sheet of the drying part after the paper is discharged is 94.3 percent; the calender was operated in single-nip mode with a hot-roll temperature of 80 ℃ and a linear pressure of 58kN/m. In addition, other parameters of the paper machine include: the net speed is 925m/min, the pulp net speed ratio is 1.026, the pressing one-line pressing pressure is as follows: 280kN/m, two-line pressure: 730kN/m, lip opening: 10.5mm.
Coating the dried paper sheet in a coating unit; the coating formula is as follows:
TABLE 3 coating formulation and coating Properties
The embodiment of the invention adopts oxidized starch, and in order to ensure the rheological property of the coating, the content of oxidized starch protein is required to be lower than 0.2%; the lubricant and the water repellent agent are respectively food-grade calcium stearate and ammonium zirconium carbonate.
Coating conditions: line pressure 18KN/m, sizing tension 236N/m, metering bar loading pressure 1.21bar.
The quality of the obtained paper product is as follows: the quantitative determination was 60g/m 2 Water content of 7.2%, whiteness ISO of 85%, opacity of 87.1%, bulk of 1.28cm 3 G, surface absorption weight 29g/m 2 The longitudinal fracture length is 4850m, the smoothness is 48s, the longitudinal stiffness is 69mN, and the paper surface glossiness is 3.5%.
From the above examples, the bleached sulfate softwood chemical pulp, the bleached sulfate hardwood chemical pulp and the hydrogen peroxide bleached disc mill mechanical pulp are used as fiber raw materials for blending, and in the concrete operation of blending, the mass percentages of the bleached sulfate softwood chemical pulp, the bleached sulfate hardwood chemical pulp and the hydrogen peroxide bleached disc mill mechanical pulp are 30-40%, 30-40% and 20-40% in sequence; the beating degrees are respectively 44-48 degrees SR, 28-32 degrees SR and 38-42 degrees SR; and then the pizza box facial tissue which can be used as the pizza box facial tissue is obtained through the process steps of coating, calendaring and the like. The product prepared by the method is smooth and fine, the paper surface gloss is low, the product is not dazzling, the printing gloss is high, the printing color reduction degree is high, the stiffness and the surface strength are good, the dust degree is low, the machine-passing performance is excellent, the printing is exquisite, the requirements of flexographic printing can be met, and simultaneously the national food paper sanitary standard of GB11680 is met. The product of the invention is used as the surface paper of the pizza package box, and has good printing effect.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (9)
1. The preparation method of the pizza box facial tissue is characterized by comprising the following steps:
s1, pulping bleached sulfate softwood chemical pulp, bleached sulfate hardwood chemical pulp and hydrogen peroxide bleached disc mill mechanical pulp to 44-48 DEG SR, 28-32 DEG SR and 38-42 DEG SR respectively, and preparing pulp according to the mass percentage: 30-40% of bleached sulfate softwood chemical pulp, 30-40% of bleached sulfate hardwood chemical pulp and 20-40% of hydrogen peroxide bleached disc mill mechanical pulp;
s2, adding auxiliary materials after the pulp is prepared, and making to obtain wet paper;
s3, sequentially carrying out front drying, coating, rear drying and press polishing on the wet paper to obtain pizza box facial tissue; the coating adopted by the coating comprises a food-grade adhesive, and the food-grade adhesive comprises food-grade polyvinyl acetate and low-viscosity polyvinyl alcohol; in the coating, the dosage of the food-grade polyvinyl acetate is more than that of the low-viscosity polyvinyl alcohol; the viscosity of the low-viscosity polyvinyl alcohol at 25 ℃ is 15-25mPa.s; the coating comprises flaky porcelain clay and nanoscale silicon dioxide;
the pizza box facial tissue ration is 55-60g/m 2 And the printing glossiness is more than 25%.
2. The preparation method according to claim 1, wherein the pulp obtained by pulp preparation is prepared to have a concentration of 2.8-3.2%; the auxiliary material comprises a polyacrylamide reinforcing agent, and a concrete addition point is a pump inlet of a pulping pool; the dosage of the polyacrylamide reinforcing agent accounts for 2-4% of the weight of the paper.
3. The preparation method according to claim 2, characterized in that the auxiliary materials comprise, relative to the amount of oven-dried pulp: 1.5-2.5% by weight of an alkyl ketene dimer; 10-15% by weight of a filler; 1.0-2.0% by weight of cationic starch; 0.03-0.08% by weight of cationic polyacrylamide; 0.2-0.5% by weight of bentonite.
4. The method according to claim 1, wherein the paper making specifically comprises: and sequentially carrying out thick pulp screening, seasoning, pulp washing, sand and gas removal, sizing, fine screening, net part dehydration forming and squeezing to obtain the squeezed wet paper.
5. The method according to any one of claims 1 to 4, wherein the coating material contains 10% of the low-viscosity polyvinyl alcohol as a solid content.
6. The method according to claim 5, wherein the coating material has a radius-thickness ratio of the flaky china clay of 30 to 60.
7. The preparation method according to claim 6, wherein the coating specifically comprises, in parts by weight: 5-10 parts of nano-silicon dioxide; 90-95 parts of flaky porcelain clay; 4-10 parts of coating starch; 15-20 parts of food-grade polyvinyl acetate; 3-6 parts of low-viscosity polyvinyl alcohol; 0.5-2.5 parts of a lubricant; 0.5-1.5 parts of water repellent agent.
8. The method according to claim 7, wherein the reaction mixture is heated to a temperature in the reaction mixtureCharacterized in that the solid content of the coating is 5-10%, and the coating weight is 6-10g/m 2 。
9. The pizza box facial tissue obtained by the manufacturing method according to any one of claims 1 to 8, having a basis weight of 55 to 60g/m 2 The whiteness ISO is 84-86%, the opacity is 86-88%, and the bulk is more than 1.25cm 3 A surface absorption weight of less than 35g/m 2 The longitudinal fracture length is larger than 4500m, the smoothness is larger than 40s, the longitudinal stiffness is larger than 65mN, the paper surface glossiness is smaller than 5%, the printing glossiness is larger than 25%, and the surface strength is larger than 1.0m/s.
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