CN116497629A - CCK paper and preparation method thereof - Google Patents

CCK paper and preparation method thereof Download PDF

Info

Publication number
CN116497629A
CN116497629A CN202310429676.1A CN202310429676A CN116497629A CN 116497629 A CN116497629 A CN 116497629A CN 202310429676 A CN202310429676 A CN 202310429676A CN 116497629 A CN116497629 A CN 116497629A
Authority
CN
China
Prior art keywords
coating
paper
cck
styrene
pigment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310429676.1A
Other languages
Chinese (zh)
Inventor
陶卫峰
李俊
王红亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gold East Paper Jiangsu Co Ltd
Original Assignee
Gold East Paper Jiangsu Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gold East Paper Jiangsu Co Ltd filed Critical Gold East Paper Jiangsu Co Ltd
Priority to CN202310429676.1A priority Critical patent/CN116497629A/en
Publication of CN116497629A publication Critical patent/CN116497629A/en
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/001—Release paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)

Abstract

The application provides a preparation method of CCK paper and the CCK paper, and relates to the technical field of papermaking. The preparation method of the CCK paper comprises the steps of manufacturing base paper; preparing a coating; coating the coating on the base paper to form coated paper; performing supercalendering treatment on the coated paper to obtain CCK paper; wherein the coating comprises a top coating for forming a top coating of the coated paper, the top coating comprises styrene-acrylic latex, and the mass part ratio of the styrene-acrylic latex of the top coating to the pigment of the top coating is 0.40-0.50. According to the method, the styrene-acrylic latex with the mass part to pigment ratio of 0.40-0.50 is added when the top coating is configured, so that the film forming compactness of the coated paper is improved, the stripping performance of the prepared CCK paper is improved, and meanwhile, the reduction of the capacity of the CCK paper caused by the too low drying efficiency of the top coating can be avoided.

Description

CCK paper and preparation method thereof
Technical Field
The application relates to the technical field of papermaking, in particular to a preparation method of CCK paper and the CCK paper.
Background
Release paper, also called release paper, has the function of isolating sticky objects and is widely applied to industries such as food, medical and health and the like. Coating a release agent on paper is a common preparation method of release paper, and the release agent can be attached to the paper to form a release film with anti-tackiness. However, the release agent easily penetrates into the paper, resulting in problems of poor subsequent curing and a large amount of release agent (excessive cost).
The common mode adopted in the industry is to use Polyethylene (PE) particles to carry out film coating treatment on the surface of base paper, and the coated paper has certain barrier property and can prevent release agent from penetrating. However, since PE is not easily degraded, the preparation of such release paper is liable to cause environmental pollution. Therefore, the development of the plastic-free release paper without the film coating treatment has important significance.
CCK paper (CLAY COATED KRAFT PA-PER), also known as kaolin coated paper, is an organic paper with a special coating process on the surface, and has the characteristics of green and environment-friendly. However, the peeling property of the existing CCK paper is not ideal and needs to be improved.
Disclosure of Invention
The technical problem that this application mainly solves is how to improve the peeling property of CCK paper.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: provided is a method for preparing CCK paper, comprising:
manufacturing base paper;
preparing a coating;
coating the coating on the base paper to form coated paper; and
carrying out supercalendering treatment on the coated paper to obtain CCK paper;
wherein the coating comprises a top coating for forming a top coating of the coated paper, the top coating comprises styrene-acrylic latex, and the mass part ratio of the styrene-acrylic latex of the top coating to the pigment of the top coating is 0.40-0.50.
In some embodiments, the coating material formulated in the step of configuring the coating material further comprises a primer coating material;
the step of applying the coating to the base paper comprises:
coating the base coating on the base paper to form at least one base coating layer;
drying the bottom coating;
coating the surface coating on the dried bottom coating to form a surface coating; and
the topcoat is dried.
In some embodiments, the primer coating includes styrene-acrylic latex, and the ratio of the styrene-acrylic latex of the primer coating to the pigment of the primer coating is from 0.20 to 0.30 parts by mass.
In some embodiments, the pigment component of the basecoat coating is calcium carbonate.
In some embodiments, in the step of supercalendering the coated paper, the temperature of the calender roll of the supercalender is controlled to be no greater than 45 degrees celsius.
In some embodiments, cooling water is introduced into the super calender to control the calender roll temperature.
In some embodiments, the glass transition temperature of the styrene-acrylic latex in the coating is 0.1% to 0.3%.
In some embodiments, the pigment components of the topcoat are calcium carbonate and kaolin, and each part of the pigment of the topcoat comprises 0.40 to 0.60 parts calcium carbonate, and 0.40 to 0.60 parts kaolin.
In some embodiments, the coating further comprises a calcium stearate type lubricant, the ratio of the calcium stearate type lubricant to the pigment of the coating being from 1.0% to 2.0% by mass.
In some embodiments, the step of configuring the coating comprises: carboxymethyl cellulose is added to provide a viscosity of the formulated coating of 800cps to 1000cps.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: provided is CCK paper, which is prepared by the preparation method of the CCK paper.
Compared with the prior art, the preparation method of the CCK paper and the CCK paper provided by the application have the beneficial effects that:
according to the method, the styrene-acrylic latex with the mass part to pigment ratio of 0.40-0.50 is added when the top coating is configured, so that the film forming compactness of the coated paper is improved, the stripping performance of the prepared CCK paper is improved, and meanwhile, the reduction of the capacity of the CCK paper caused by the too low drying efficiency of the top coating can be avoided.
Drawings
FIG. 1 is a schematic flow chart of a method of making CCK paper provided in some embodiments of the present application;
FIG. 2 is a schematic illustration of a partial manufacturing flow of coated paper provided in some embodiments of the present application;
FIG. 3 is a schematic structural view of CCK paper provided in some embodiments of the present application;
FIG. 4 is a schematic diagram of the structure of a CCK provided in other embodiments of the present application;
FIG. 5 is a schematic diagram of the structure of a CCK provided in other embodiments of the present application;
fig. 6 is a schematic structural diagram of CCK according to other embodiments of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The application provides a preparation method of CCK paper. Referring to fig. 1, fig. 1 is a schematic flow chart of a method for preparing CCK paper according to some embodiments of the present application.
In some embodiments, the method of making CCK paper comprises the steps of:
s11, making base paper.
And (5) making base paper, namely papermaking. The making of the base paper comprises the procedures of pulping, sizing, adding filler, papermaking, finishing and the like. The papermaking is the process from slurry to paper forming.
The materials and processes used in the manufacture of the base paper are not limited herein.
The base paper manufactured by the paper making method can be used for preparing release paper, for example, the release agent is coated on the base paper to form release paper with anti-sticking performance. Release agents include, but are not limited to, silicone oils, polyvinyl alcohols, silicone greases, and the like. However, the release agent easily penetrates into the interior of the base paper, resulting in a decrease in release effect, and thus it is necessary to prepare an isolating layer on the surface of the base paper to block the release agent, such as a coating layer.
S12, preparing a coating.
After a large number of experiments and related detection, the laboratory finds that the plastic fluorescent whitening agent (OBA) and some sulfur-containing chemicals added in the current paint react with the release agent in the subsequent non-setting adhesive, so that the release effect is reduced. Therefore, in the steps of preparing the coating and manufacturing the base paper, the application of the OBA can be completely canceled, and the release effect is prevented from being reduced due to the reaction of the OBA and the subsequent release agent (mainly silicone oil).
The formulated coating may be applied to the front and/or back side of the base paper to form a coating layer, or may be applied to a coating layer on the base paper to form a layered coating layer. The coatings used for the different coatings may be the same or different. That is, the coating material configured in this step includes, but is not limited to, one.
The strict sequence of steps S11 and S12 is not limited, that is, either one of the steps of making the base paper and preparing the coating may be performed before the other step is performed, or both steps may be performed simultaneously.
S13, coating the coating on the base paper to form coated paper.
The coating material prepared in step S12 includes a top coating material, and the top coating material is applied to the base paper to form a top coating layer. The surface coating can be used as an isolation layer between the base paper and the release agent so as to improve the release effect of the release paper.
The coating method of the coating material may be blade coating, dip coating, roll coating, air knife coating, or the like. Hereinafter, doctor blade coating will be described as an example. Blade coating can be achieved using a high-speed blade coater, the coating speed of which is primarily dependent on the speed of the high-speed blade coater. The existing domestic enterprises for producing release paper mostly use small-sized machines for production, a large amount of high molecular polymers such as latex, PVA and the like are added into a paint formula, and the release agent is blocked by utilizing the film forming property of the high molecular polymers.
Optionally, the topcoat includes styrene-acrylic latex. The addition of the styrene-acrylic latex can improve film forming compactness and is beneficial to improving the release effect of release paper.
It should be noted that the coating needs to be dried after coating, and the drying efficiency directly affects the productivity of the paper. Because the production speed of the small machine is low, the problem of the short plate with the drying capacity cannot be displayed. The domestic large-scale high-speed wide-width coating machine is mainly used for producing newsprint, cultural paper and the like, or has no coating or low coating weight, the adhesive content in the formula of coated paper is only 8-15%, and the short board with drying capability is not obvious. However, when CCK paper is prepared by using a large-sized machine, the drying efficiency of the coating layer has a great influence on the production efficiency, and the coating layer which is not dried in time in the production process is easily adhered to the paper roll, so that the paper and even equipment are damaged.
The applicant researches find that the addition amount of the styrene-acrylic latex can influence the film forming compactness and the drying efficiency of the coating. Experiments prove that when the top-coating paint is prepared, if 100 parts of pigment is added, 35-50 parts of styrene-acrylic latex, such as 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts and the like, are added, so that the film forming compactness of the coating can be improved, and meanwhile, the good drying efficiency of the coating can be ensured. In other words, the ratio of the styrene-acrylic latex of the top coat to the pigment of the top coat is 0.40-0.50 parts by mass including, but not limited to, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50.
Pigments are one of the basic components of the surface coating material of coated paper, and also the main component thereof, and in some documents, pigments are also referred to as main materials, fillers, and the like. The mass parts are an intuitive mass proportioning method which is used for the industry for the convenience of calculation, and the numbers directly represent the mass of the materials to be proportioned. The mass of the proportioned material can be understood as the mass of the solid content or the absolute dry mass. In the practical application process, the units can be changed at will according to the needs only by adding the units according to the proportion. The method is simple and easy to operate, and the conversion into percentage is not needed.
The applicant has further studied and found that when the glass transition temperature (Tg value) of the styrene-acrylic latex is 0 degree to 3.0 degrees, for example 0 degree, 0.5 degree, 1.0 degree, 1.5 degree, 2.0 degree, 2.5 degree, 3 degree, further improvement of film forming compactibility is facilitated.
Alternatively, the coating applied to the base paper may be a multilayer. Referring to fig. 2 in combination, fig. 2 is a schematic view of a part of a preparation process of coated paper according to some embodiments of the present application.
S21, coating the base coating on the base paper to form at least one base coating layer.
The coating material prepared in the step of preparing the coating material further comprises a primer coating material. The primer coating can be the same coating as the top coating, namely the prepared top coating can also be used as the primer coating. The primer coating may also be a different coating than the topcoat coating.
Wherein, the primer coating can also comprise styrene-acrylic latex. The ratio of the styrene-acrylic latex of the primer coating to the pigment of the primer coating is 0.20 to 0.30 parts by mass, for example, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30 parts by mass, i.e., 20 to 30 parts by mass of the styrene-acrylic latex is added per 100 parts by mass of the pigment. Alternatively, the styrene-acrylic latex added in the preparation of the paint including, but not limited to, top-coat paint, bottom-coat paint is the same styrene-acrylic latex.
Alternatively, the pigment component of the primer coating is calcium carbonate, i.e., the pigment of the primer coating is composed entirely of calcium carbonate, and does not contain kaolin. Compared with the top coating, the bottom coating is not obvious to the surface layer of the coated paper, so the pigment can be completely composed of calcium carbonate to reduce the production cost.
Alternatively, the calcium carbonate as the primary coating pigment may be a heavy calcium carbonate having a grade of 65-70, i.e., the particles smaller than 2 microns in calcium carbonate may be present in an amount of 65% -70%, such as 65%, 66%, 67%, 68%, 69%, 70%, etc., in the population to reduce production costs.
S22, drying the bottom coating.
After the formation of the primer layer, a drying treatment is required, and then a new coating material is further applied on the primer layer.
Optionally, the step adopts an infrared drying mode to realize the drying treatment. Infrared is a light ray having a wavelength between that of visible light and microwaves, and has a strong penetrating power to the coating. During drying, infrared rays can penetrate through the coating to generate a heat effect in the coating so as to dehydrate the coating to achieve the purpose of drying. Compared with microwaves, the infrared drying has little influence on the coating, and excessive drying and area loss can be avoided. In addition, the drying efficiency of infrared ray drying is higher, can improve the drying efficiency of coating, and then improves the speed of a motor vehicle.
It will be appreciated that infrared drying may also be applied to the drying process of other coatings.
S23, coating the surface coating on the dried bottom coating to form a surface coating.
Wherein, the pigment component of the top coating can be calcium carbonate and kaolin. Optionally, each part of the top coat pigment comprises 0.40 to 0.60 parts calcium carbonate, and 0.40 to 0.60 parts kaolin, that is, 40 to 60 parts calcium carbonate, such as 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, etc., may be included per 100 parts of the top coat pigment, with the remainder being kaolin.
Optionally, the top-coated calcium carbonate is a heavy calcium carbonate having a particle size of 2 microns and a particle size content of 95% -99%, such as 95%, 96%, 97%, 98%, 99% and the like.
S24, drying the surface coating.
The top coat may be dried in the same manner as the base coat. In some embodiments, a high speed blade coater may apply multiple layers of coating on one side of the base paper at intervals, with infrared drying between each two applications to ensure that the coating on the base paper is dry at the next application, allowing for high speed in-line production. Wherein, the infrared drying can simultaneously dry a plurality of papers including, but not limited to, the base paper surface coating is a base coating and the surface pattern coating. Similarly, when other drying modes are adopted, a plurality of papers in different coating states can be dried synchronously, so that the production efficiency is improved.
By the coating mode, after the roughness and the absorptivity of the surface of the base paper are improved by utilizing the bottom coating, the surface coating is coated again, so that the quality of the coated paper is improved. Through the design of the multi-layer coating, the coating amount of each layer of coating can be controlled, so that the situation that the coating amount of the coating is too large to be dried in time is avoided, the overall drying efficiency is improved, and the production speed is further improved.
Optionally, the coating of the arrangement may also include a back-coating that may be applied to the back side of the base paper to form a back-coating layer opposite the top-coating layer.
S14, carrying out supercalendering treatment on the coated paper to obtain CCK paper.
After the surface coating is dried to form coated paper, the coated paper can be subjected to heavy pressing by a super calender, so that the smoothness of the surface of the paper is improved and the pores of the coating are closed. The super calender is used for finishing paper surface, which is favorable for forming a compact reticular membrane structure on the surface layer so as to achieve the effect of isolating the membrane layer.
Optionally, in performing the supercalendering process, the temperature of the calender roll of the supercalender is controlled to be no greater than 45 degrees celsius. The principle is as follows: when the super calender is used for calendering, the calender roll can rub with paper surface to generate heat, so that the temperature of the calender roll is increased, and the high temperature can soften the surface of a coating containing a large amount of latex and adhere to the roll surface, so that the surface layer is napped, and the compactness of the coating is damaged. The applicant has found that by controlling the temperature of the calender roll to 45 degrees or less, for example, 43 degrees or less, 41 degrees or less, 39 degrees or less, 37 degrees or less, 35 degrees or less, a dense net-like film structure can be formed on the surface of the coated paper while the adhesion of the coating layer to the calender roll can be avoided.
Wherein, the temperature control of the calender roll can be realized by introducing cooling water into the super calender. Specifically, the cooling water may pass through a pipe in contact with the calender roll to reduce the temperature of the calender roll. Of course, other cooling fluids may be introduced to reduce the calender roll temperature, or by other cooling means.
The production speed of CCK paper is limited by supercalendering treatment speed, and after adopting a method for cooling a calender roll, the possibility of the occurrence of the phenomenon that the calender roll is adhered to the coating due to rapid friction heat generation with the coating is reduced, so that the production speed can be increased to increase the productivity.
In some embodiments, the coating, including but not limited to basecoat coatings and topcoat coatings, also include a calcium stearate lubricant to prevent the calender roll from roughening during calendering and causing damage to the surface layer of the coated paper. The applicant found that when the ratio of the calcium stearate type lubricant to the pigment of the paint in parts by mass is 1.0% -2.0%, i.e., 1-2 parts, for example, 1.0 part, 1.3 parts, 1.5 parts, 1.7 parts, 2.0 parts of the calcium stearate type lubricant is added per 100 parts of the pigment, the occurrence probability of the phenomenon of the roughening of the calender roll can be effectively reduced without reducing the quality of paper.
When CCK paper is prepared, a proper amount of calcium stearate lubricant is added into the coating, and meanwhile, the temperature of the calender roll is reduced, so that the safety line of the production speed can be remarkably increased, the phenomenon of roughening of the calender roll when the production speed is increased is avoided, and the capacity is increased.
In addition, when coating materials including, but not limited to, top-coat coating materials, bottom-coat coating materials, carboxymethyl cellulose (CMC) may also be added to control the viscosity of the coating materials being formulated. CMC can be obtained by carboxymethyl cellulose, and its aqueous solution has functions of thickening, film forming, adhesion, water retention, colloid protection, emulsification, suspension, etc. CMC may be added and stirred continuously until the CMC is sufficiently melted when the coating is formulated.
Wherein, the addition amount of CMC can be adjusted according to the viscosity of the paint so that the viscosity of the paint is 800cps-1000cps, such as 800cps, 850cps, 900cps, 950cps, 1000cps, etc. It was found that when the viscosity of the coating was controlled by CMC, it was possible to prevent aggregation and precipitation of dispersed coating particles to improve the stability of the coating, and to stably coexist with various additives of the coating to avoid degradation of the paper quality. Table 1 shows the coating formulation provided in one example of the present application, wherein the values represent the corresponding parts by weight.
TABLE 1 coating formulation
Coating material Bottom coating Surface coating
Calcium carbonate (65 grade) 100 0
Calcium carbonate (98 grade) 0 40-60
Kaolin clay 0 60-40
Starch 4-8 0
Styrene-acrylic resinLatex 20-30 40-50
Carboxymethyl cellulose Adjusting according to viscosity Adjusting according to viscosity
Calcium stearate type lubricant 1.0-2.0 1.0-2.0
The following are methods for preparing CCK papers provided in some examples of the present application.
Example 1
1. Raw paper making
Needle pulp (420-440 ml) and broad leaf pulp (420-440 ml) with controlled grinding freeness according to 2:8, carrying out pulp proportioning and papermaking according to the proportion; adding 14% of filler, purifying and deslagging by a six-section conical slag remover through a pulp pump, adding 8kg/t of cationic starch and 8kg/t of sizing agent alkyl ketene dimer according to the dosage of 8kg of ton paper, and adding a proper amount of retention aid; then feeding into a headbox for net-making and papermaking; drying the paper sheet at 90-130 deg.c with the water content of the paper sheet 3-4% before sizing being fed into the sizing part in the size of 1.0g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Bulk control to 1.2 (bulk = thickness/basis weight); controlling the basis weight of the paper web at 63g/m 2 Left and right; the paper machine speed was set at 1400m/min.
2. Coating preparation
The bottom coating contains 100% of heavy calcium carbonate with the particle size of 2 microns and the content of 68%; 4% of starch (autorotation starch, oxidized starch), 30% of styrene-acrylic latex (Tg: 0-3 ℃), 0.1% -0.3% of dispersing agent; each chemical (water-calcium carbonate-dispersant-starch-latex) was added in sequence in a high-speed mixer, and stirred for another 10 minutes after the addition was completed, the solid content of the coating was 65%, and the viscosity was controlled to 800cps.
The top coating comprises 40% of heavy calcium carbonate with the particle size of 2 micrometers and the content of 98%, 60% of kaolin, 45% of styrene-acrylic latex, 2.0% of calcium stearate lubricant, 0.1-0.3% of dispersing agent and a proper amount of carboxymethyl cellulose; each chemical (water-calcium carbonate-kaolin-dispersant-latex-carboxymethyl cellulose-lubricant) was added in sequence in a high-speed mixer, and stirred for another 10 minutes after all addition was completed, with a coating solids content of 62%, and a viscosity controlled at 800-1000cps.
3. Coating
Coating the base paper produced in the step 1 with a coating machine with a width of 9700mm and a speed of 1500m/min, wherein the coating amount is controlled to be 8g/m 2 8g/m of topcoat 2 Sizing the back surface by using sizing starch, wherein the sizing amount is 1.0g/m 2 。
4. Supercalendering treatment
Carrying out supercalendering treatment on the coated paper, cooling a calender roll by using cooling water, maintaining the temperature of the calender roll below 45 ℃, and preventing the adhesive roll from damaging the flatness and the sealing property of the surface coating; the finished product after calendaring is 80g/m 2 Is a CCK paper of (C).
Example two
1. Raw paper making
Needle pulp (420-440 ml) and broad leaf pulp (420-440 ml) with controlled grinding freeness according to 2:8, carrying out pulp proportioning and papermaking according to the proportion; adding filler according to the proportion of 16%, purifying and deslagging by a six-section conical slag remover through a pulp flushing pump, adding 10kg/t of cationic starch and alkyl ketene dimer serving as sizing agents according to the dosage of 10kg per ton of paper, and adding a proper amount of retention aid; then feeding into a headbox for net-making and papermaking; drying the paper sheet at 90-130 deg.c with the water content of 3-4% in the sizing part before sizing in the amount of 1.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The bulk is controlled to be 1.2; controlling the basis weight of the paper web at 80g/m 2 Left and right; the paper machine speed was set at 1400m/min.
2. Coating preparation
The primer coating contains 100% of heavy calcium carbonate with the particle size of 2 micrometers and the content of 68%, 4% of starch (autorotation starch and oxidized starch), 25% of styrene-acrylic latex (Tg: 0-3 ℃) and a proper amount of dispersing agent; each chemical (water-calcium carbonate-dispersant-starch-latex) was added sequentially in a high-speed mixer, and stirred for another 10 minutes after all addition was completed, the solid content of the coating was 66%, and the viscosity was controlled to 1000cps.
The top coating contains 50% of heavy calcium carbonate with the 2-micrometer particle size content of 98%, 50% of kaolin, 40% of styrene-acrylic latex (Tg: 0-3 ℃), 1.0% of calcium stearate type lubricant, a proper amount of dispersing agent and a proper amount of carboxymethyl cellulose; each chemical (water-calcium carbonate-kaolin-dispersant-latex-carboxymethyl cellulose-lubricant) was added sequentially in a high speed mixer, stirred for another 10 minutes after all addition was completed, the coating solids content was 64%, and the viscosity was controlled at 1000cps.
3. Coating
The base paper produced in the step 1 is coated by a doctor blade with the width of the coating machine of 9700mm and the speed of 1500m/min, and the coating amount is controlled to be 10g/m 2 10g/m of topcoat 2 Sizing the back surface by using sizing starch, wherein the sizing amount is 1.5g/m 2 。
4. Supercalendering treatment
Carrying out supercalendering treatment on the coated paper, cooling a calender roll by using cooling water, maintaining the temperature of the calender roll below 45 ℃, and preventing the adhesive roll from damaging the flatness and the sealing property of the surface coating; the finished product after calendaring is 100g/m 2 Is a CCK paper of (C).
Example III
1. Raw paper making
Needle pulp (420-440 ml) and broad leaf pulp (420-440 ml) with controlled grinding freeness according to 2:8, carrying out pulp proportioning and papermaking according to the proportion; adding filler according to the proportion of 14%, purifying and deslagging by a six-section conical slag remover through a pulp flushing pump, adding cationic starch according to the dosage of 10kg per ton of paper (10 kg/t), adding sizing agent Alkyl Ketene Dimer (AKD) according to the dosage of 8kg per ton of paper (8 kg/t), and adding a proper amount of retention aid; then feeding into a headbox for net-making and papermaking; drying the paper sheet at 90-130 deg.c with the water content of 3-4% in the sizing part before sizing in the amount of 1.2g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The bulk was controlled to 1.2The method comprises the steps of carrying out a first treatment on the surface of the Controlling the basis weight of the paper web at 75g/m 2 Left and right; the paper machine speed was set at 1400m/min.
2. Coating preparation
The primer coating contains 100% of heavy calcium carbonate with the particle size of 2 micrometers and the content of 68%, 4% of starch (autorotation starch and oxidized starch), 30% of styrene-acrylic latex (Tg: 0-3 ℃) and a proper amount of dispersing agent; each chemical (water-calcium carbonate-dispersant-starch-latex) was added sequentially in a high-speed mixer, and stirred for another 10 minutes after all addition was completed, the solid content of the coating was 66%, and the viscosity was controlled at 800-1000cps.
The top coating contains 40% of heavy calcium carbonate with the particle size of 2 microns and the content of 98%, 60% of kaolin and 45% of styrene-acrylic; latex (Tg: 0-3 degrees), 2.0% of calcium stearate type lubricant, a proper amount of dispersing agent and a proper amount of carboxymethyl cellulose; each chemical (water-calcium carbonate-kaolin-dispersant-latex-carboxymethyl cellulose-lubricant) was added in sequence in a high-speed mixer, and stirred for another 10 minutes after all addition was completed, the solid content of the coating was 62%, and the viscosity was controlled at 800-1000cps.
3. Coating
Coating the base paper produced in the step 1 with a coating machine with a width of 9700mm and a speed of 1500m/min, wherein the coating amount is controlled to be 8g/m 2 8g/m of topcoat 2 The back surface is coated with a layer of primer coating with the coating weight of 8g/m 2 The finished paper after drying is 100g/m 2 Is a coated paper of (a).
4. Supercalendering treatment
And (3) carrying out supercalendering treatment on the coated paper, cooling the calender roll by using cooling water, maintaining the temperature of the calender roll below 45 ℃, and preventing the adhesive roll from damaging the flatness and the sealing property of the surface coating. The pressed paper is 100g/m 2 Is a CCK paper of (C).
Example IV
1. Raw paper making
Needle pulp (420-440 ml) and broad leaf pulp (420-440 ml) with controlled grinding freeness according to 2:8, carrying out pulp proportioning and papermaking according to the proportion; the filler is added according to the proportion of 16 percent, and is purified and deslagged by a six-section conical deslagging device through a pulp flushing pump, and added into the paper according to the dosage of 10kg per ton of paper10kg/t of ionic starch and sizing agent alkyl ketene dimer, and adding a proper amount of retention aid; then feeding into a headbox for net-making and papermaking; drying the paper sheet at 90-130 deg.c with the water content of 3-4% in the sizing part before sizing in the amount of 1.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The bulk is controlled to be 1.2; controlling the basis weight of the paper web at 80g/m 2 Left and right; the paper machine speed was set at 1400m/min.
2. Coating preparation
The primer coating contains 100% of heavy calcium carbonate with the particle size of 2 micrometers and the content of 68%, 4% of starch (autorotation starch and oxidized starch), 25% of styrene-acrylic latex (Tg: 0-3 ℃) and a proper amount of dispersing agent; each chemical (water-calcium carbonate-dispersant-starch-latex) was added sequentially in a high-speed mixer, and stirred for another 10 minutes after all addition was completed, the solid content of the coating was 66%, and the viscosity was controlled at 800-1000cps.
The top coating contains 50% of heavy calcium carbonate with the 2-micrometer particle size content of 98%, 50% of kaolin, 40% of styrene-acrylic latex (Tg: 0-3 ℃), 2.0% of calcium stearate type lubricant, a proper amount of dispersing agent and a proper amount of carboxymethyl cellulose; each chemical (water-calcium carbonate-kaolin-dispersant-latex-carboxymethyl cellulose-lubricant) was added sequentially in a high-speed mixer, and stirred for another 10 minutes after all addition was completed, with a coating solids content of 64%, and a viscosity control of 800-1000cps.
3. Coating
Coating the base paper produced in the step 1 with a coating machine with a width of 9700mm and a speed of 1500m/min, wherein the coating amount is controlled to be 8g/m 2 8g/m of topcoat 2 The back surface was coated in the same coating manner, and the coating amount of the back surface coating was 8g/m each 2 。
4. Supercalendering treatment
And (3) carrying out supercalendering treatment on the coated paper, cooling the calender roll by using cooling water, maintaining the temperature of the calender roll below 45 ℃, and preventing the adhesive roll from damaging the flatness and the sealing property of the surface coating. The pressed paper is 120g/m 2 Is a CCK paper of (C).
The present application uses CCK paper prepared by the preparation method provided in examples 1 to 4 above as a test sample and a commercial CCK product as a comparative example to conduct a peeling property test after coating a release agent on CCK paper.
TABLE 2 Peel Performance test
Description of detection items:
test sample 1 was CCK paper prepared by the preparation method provided in example 1, and similarly, test samples 2, 3, and 4 were CCK paper prepared by the preparation methods provided in examples 2, 3, and 4, respectively. The front side of the test specimen 3, 4 refers to the side thereof on which the topcoat is formed, and the back side refers to the side thereof facing away from the topcoat.
The release agent in the release agent coating amount (Coat Weight) is silicone oil. The amount of release agent applied to the material is in grams per square meter. Typically, the solvent-free silicone oil is applied in an amount of from 0.30 to 0.80 grams per square meter and the solvent-free silicone oil is applied in an amount of from 0.80 to 1.30 grams per square meter. The amount of silicone oil applied directly affects the release properties. The high coating weight can compactly cover the base paper and ensure the even distribution of the silicone oil. And the low silicone oil coating amount is easy to cause phenomena such as missing coating and the like, so that the peeling is poor. Some existing heavy release papers are made by reducing the silicone oil coating level, resulting in a heavy peel, which is quite risky to use. The preparation method provided by the application realizes the preparation of release paper by adjusting the chemical formula and the chemical process on the premise of not reducing the coating amount of the silicone oil, and has good stripping performance.
The comparative examples and the Cure results (Cure Condition) for each test specimen were no extinction, no silicon loss, no silicon transfer. The curing conditions (Cure Condition) were 120 degrees celsius for 20 seconds.
Peel force: peel force data, in N/25mm, obtained by standard test methods at normal temperature, can be converted to grams. In general, a peel force of not more than 0.10N/25mm, i.e., 10g or less, is colloquially referred to as light peel. A peel force of not more than 0.20N/25mm, i.e., 20g or less, is commonly referred to as mid-peel. A peel force of 0.35-0.45N/25mm, i.e., 35-45 grams, is commonly referred to as heavy peel. The peeling force of 0.60-0.80N/25mm, namely 60-80 g, is commonly called heavy peeling. In addition, the peeling force of 0.03-0.04N/25mm, namely 3-4 g, is commonly called light peeling. A peel force of 1.00N/25mm, i.e., greater than 100 grams, is commonly referred to as overweight peel.
The first peel force (RF 0.3m/min Tesa 7475 (RT)) is the peel force data measured for the comparative example and each test specimen without special treatment. The second peel force (RF 0.3m/min Tesa 7475 (70C)) is the peel force data measured for the comparative example and each test specimen after the high temperature aging treatment.
Residual adhesion (SA) refers to the force of release paper after first stripping and during second stripping, and data obtained after calculation mainly reflect the curing effect of silicone oil. The residual adhesion of UV-curable silicone oils is generally 100% and the residual adhesion of heat-curable silicone oils is at most 90%.
The existing CCK paper is usually produced at a speed of 100-300m/min, and the embodiment of the application can enable the produced release paper to be kept at a high quality level of light stripping and medium stripping under the condition that the production speed is improved to 1300-1500m/min, so that the production efficiency of the CCK paper is remarkably improved.
The present application further provides CCK paper made by the above-described method of making CCK paper.
Referring to fig. 3, fig. 3 is a schematic structural diagram of CCK paper according to some embodiments of the present application.
In some embodiments, CCK paper 10 may include a base paper 100 and a topcoat 200 disposed on one side of base paper 100. Topcoat 200 may be comprised of a topcoat applied to base paper 100 and forms the top layer of CCK paper.
It should be understood that the terms "comprising," "including," "having," and any variations thereof, as used in this specification and the appended claims, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Referring to fig. 4, fig. 4 is a schematic structural diagram of CCK according to other embodiments of the present application.
In some embodiments, the coating of CCK paper 10 may include a top coating 200 and a bottom coating 300. The primer layer 300 is composed of a primer coating applied to the base paper 100. Topcoat 200 is comprised of a topcoat applied over basecoat 300.
Among them, the paper provided with the undercoat layer 300 has lower surface roughness and better surface absorbency than the base paper 100, so that the peeling property of the top coat 200 can be improved, the smoothness of the top coat 200 can be improved, and the quality of the CCK paper 10 can be improved.
Referring to fig. 5, fig. 5 is a schematic structural diagram of CCK according to other embodiments of the present application.
In some embodiments, CCK paper 10 may have multiple base coats 300, such as a first base coat 310 disposed on base paper 100, and a second base coat 320 disposed on first base coat 310. Topcoat 200 may be disposed over second primer layer 320. In other embodiments, the number of primer layers 300 may also be greater than 2.
By designing the coating of the CCK paper 10 as a multiple layered structure, it is advantageous to control the coating amount of each layer of coating to avoid the problem that a certain coating is difficult to dry in time due to the excessive coating amount.
It is to be understood that the terminology used herein in the description and the claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. For example, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "first" and "second" as used in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. Also as used in the description of this application, "multiple layers" means two or more layers unless specifically defined otherwise.
Referring to fig. 6, fig. 6 is a schematic structural diagram of CCK according to other embodiments of the present application.
In some embodiments, CCK paper 10 includes a base paper 100, a top coat 200, and a back coat 400. The back coating 400 is provided on the side of the base paper 100 facing away from the face coating 200, forming the back (reverse) of CCK to 10. The CCK paper 10 may also include one or more primer layers 300, among other things.
Optionally, sizing starch or other sizing agent is provided between the base paper 100 and the coating of the CCK paper 10 to enable stable adhesion of the coating to the base paper 100.
It is understood that CCK papers of other structures can be manufactured by the above-mentioned method for manufacturing CCK papers, which are also within the scope of the present application, and are not listed here for avoiding redundancy.
In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In summary, the formula and the preparation process of the CCK paper are improved, so that the production efficiency of the CCK paper is obviously improved under the condition of ensuring good paper quality of the CCK paper, and the production capacity is increased.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (11)

1. A method for preparing CCK paper, comprising:
manufacturing base paper;
preparing a coating;
coating the coating on the base paper to form coated paper; and
carrying out supercalendering treatment on the coated paper to obtain CCK paper;
wherein the paint comprises a top-coat paint for forming a top-coat layer of the coated paper, the top-coat paint comprises styrene-acrylic latex, and the mass fraction ratio of the styrene-acrylic latex of the top-coat paint to the pigment of the top-coat paint is 0.40-0.50.
2. The method of making CCK paper according to claim 1, wherein said coating material formulated in said step of formulating a coating material further comprises a primer coating material;
the step of applying the coating to the base paper comprises:
coating the base coating on the base paper to form at least one base coating;
drying the bottom coating;
coating the top coating on the dried bottom coating to form the top coating; and drying the top coating.
3. The method for producing CCK paper according to claim 2, wherein the primer coating material comprises styrene-acrylic latex, and a ratio of the styrene-acrylic latex of the primer coating material to the pigment of the primer coating material is 0.20 to 0.30 in parts by mass.
4. A method of making CCK paper according to claim 3, wherein the pigment component of the primer coating is calcium carbonate.
5. The method for producing CCK paper according to claim 1, wherein in the step of supercalendering the coated paper, the temperature of the calender roll of the supercalender is controlled to be not more than 45 ℃.
6. The method of producing CCK paper according to claim 5, wherein cooling water is introduced into said super calender to control the temperature of said calender roll.
7. The method of producing CCK paper according to claim 1, wherein the glass transition temperature of the styrene-acrylic latex in the coating material is 0 to 3 degrees.
8. The method for producing CCK paper according to claim 1, wherein the pigment components of the topcoat are calcium carbonate and kaolin, and each part of the pigment of the topcoat comprises 0.40 to 0.60 part of calcium carbonate and 0.40 to 0.60 part of kaolin.
9. The method for producing CCK paper according to claim 1, wherein the paint further comprises a calcium stearate type lubricant, and a ratio of the calcium stearate type lubricant to a pigment of the paint is 1.0% to 2.0% by mass.
10. The method of making CCK paper according to claim 1, wherein said step of configuring said coating comprises: carboxymethyl cellulose is added so that the viscosity of the coating formulated is 800cps to 1000cps.
11. A CCK paper, characterized in that it is produced by the method for producing a CCK paper according to any one of claims 1 to 10.
CN202310429676.1A 2023-04-20 2023-04-20 CCK paper and preparation method thereof Pending CN116497629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310429676.1A CN116497629A (en) 2023-04-20 2023-04-20 CCK paper and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310429676.1A CN116497629A (en) 2023-04-20 2023-04-20 CCK paper and preparation method thereof

Publications (1)

Publication Number Publication Date
CN116497629A true CN116497629A (en) 2023-07-28

Family

ID=87316042

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310429676.1A Pending CN116497629A (en) 2023-04-20 2023-04-20 CCK paper and preparation method thereof

Country Status (1)

Country Link
CN (1) CN116497629A (en)

Similar Documents

Publication Publication Date Title
EP1945855B1 (en) Paperboard containing microplatelet cellulose particles
JP6169970B2 (en) Cellulose reinforced high mineral content product and method for producing the same
JP5571093B2 (en) Method for producing recyclable coated paper or paperboard
CN109963983B (en) Oil-resistant and grease-resistant paperboard
JP5291189B2 (en) Low density paperboard
EP1794365B1 (en) Multi-layer coated products and curtain coating process for same
EP1573129B1 (en) Fiber suspension of enzyme treated sulphate pulp and carboxymethylcellulose for surface application in paperboard and paper production.
JP7273826B2 (en) Paperboard for packaging liquid and/or frozen food
EP3617403A1 (en) Method of treating a fiber web and a treatment system for treatment of a fiber web
CN115516168B (en) Coated paper substrate suitable for metallization
JP6733627B2 (en) Fibrous cellulose-containing composition and paint
JP2023554146A (en) laminate
CA3179407A1 (en) Process for production of nano-coated substrate
CN116497629A (en) CCK paper and preparation method thereof
TW201941958A (en) Paper barrier material
JP2016223036A (en) Base paper for release paper and release paper
CA2751653A1 (en) Low density paper and paperboard with two-sided coating
JP4767452B2 (en) Process release paper for producing ceramic green sheet and method for producing the same
JP2023524281A (en) Method for producing nanocoated substrate
JP4490518B2 (en) Release paper
WO2003016397A1 (en) Formulation for achievement of release paper properties without the use of silicone
WO2022030118A1 (en) Barrier multilayer body and packaging bag
EP4352139A1 (en) Biobased barrier film for packaging material
JP2020128505A (en) Fibrous cellulose-containing composition and coating material
JP2005336675A (en) Coating liquid for coated sheet for printing, and coated sheet for printing

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination