CN111851118A - Production process of novel low-roughness coated paper and coated paper - Google Patents
Production process of novel low-roughness coated paper and coated paper Download PDFInfo
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- CN111851118A CN111851118A CN202010770808.3A CN202010770808A CN111851118A CN 111851118 A CN111851118 A CN 111851118A CN 202010770808 A CN202010770808 A CN 202010770808A CN 111851118 A CN111851118 A CN 111851118A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
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Abstract
The invention provides a production process of novel low-roughness coated paper and the coated paper, and the production process comprises the following steps: s1: cloth pulp forming and compounding; s2: squeezing and dehydrating; s3: coating, wherein when the surface sizing agent is subjected to pulp distribution forming in the step S1, a surface forming net is processed by an ULTRAEL surface ironing technology, when the wet paper web is subjected to mechanical squeezing and dewatering in the step S2, a Dynatex300 ultra-smooth base net is adopted as the upper and lower felts, and the surfaces of the upper and lower felts are subjected to flocking treatment by an iSmooth technology. According to the invention, the ULTRAEL surface ironing technology is utilized to process the surface layer forming net, the two upper and lower felts in extrusion dehydration are subjected to flocking treatment by adopting a Dynatex300 ultra-smooth base net and simultaneously matching with the iSmooth technology on the surfaces of the two upper and lower felts, the surface of the produced base paper is smoother, the coating covering is more uniform, the surface roughness of the obtained coated paper is greatly reduced, and therefore, the surface layer forming net is suitable for printing more exquisite, finer and more beautiful printing products.
Description
Technical Field
The invention relates to a production process of novel low-roughness coated paper and the coated paper, belonging to the technical field of papermaking.
Background
With the continuous development of the domestic printing industry, the upgrading of consumption and the improvement of the aesthetic packaging by terminal customers, more exquisite, more delicate and more beautiful printing products are gradually increased, and especially the printed matters with light-color ink positions provide higher requirements for paper surface covering, so that the requirements for the surface roughness of finished paper and the uniformity of coating covering are higher. Therefore, in future market competition, high-grade printing paper covers a wider range of ink positions, more exquisite patterns, higher cost performance and stronger competitiveness so as to meet the requirements of terminal customers.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a production process of novel low-roughness coated paper and the coated paper, so as to solve the problems in the background technology.
In order to achieve the aim, the invention provides a production process of novel low-roughness coated paper, which comprises the following steps:
s1: cloth pulp forming and compounding
Respectively distributing slurry on the surface layer, the lining layer, the core layer and the bottom layer to form four layers, and then combining the four layers layer by layer to form a wet paper web A;
s2: squeezing and dewatering
Conveying the wet paper web A into a press part, and mechanically squeezing and dewatering the wet paper web A to obtain a wet paper web B;
s3: coating of
Drying, sizing and hard calendering the wet paper web B to obtain base paper, and then carrying out scraper type coating to obtain coated paper;
in step S1, when the surface layer slurry is subjected to slurry distribution forming, the surface layer forming net is processed by an ULTRAEL surface ironing technology, in step S2, when the wet paper web is subjected to mechanical squeezing dehydration, the two upper and lower felts adopt Dynatex300 ultra-smooth base nets, and the surfaces of the two upper and lower felts are subjected to flocking processing by an iSmooth technology.
By adopting the scheme, the surface layer forming net is processed by utilizing the ULTRAEL surface ironing technology, the flatness of the surface layer forming net can be improved, the two upper and lower felts in extrusion dewatering are flocked by adopting a Dynatex300 ultra-smooth base net and matching with the iSmooth technology of the two upper and lower felt surfaces, the two upper and lower felt surfaces can be more flat, and the surface of the produced raw paper is more flat through the double optimization of the surface layer forming net and the two upper and lower felts, so that the surface of the produced raw paper is more flat, and the coating is more uniform when the raw paper is coated, the surface of the obtained coated paper is more flat, and the roughness is lower.
Preferably, the ULTRAEL surface ironing technology is specifically to iron and flatten the salient points of the surface layer forming net through hot-pressing and shaping by a hot plate.
By adopting the scheme, the flatness of the surface is related to the flatness of the surface layer forming net during the forming of the surface layer slurry cloth slurry, the salient points of the surface layer forming net are ironed to be smooth by the ULTRAEL surface ironing technology, and the flatness of the surface layer forming net is improved, so that the flatness of the surface of the wet paper web A is improved, the roughness of the surface of the wet paper web A is reduced, and the subsequent coating is facilitated.
Preferably, the issmooth technology flocking is to implant fine velvet on the surfaces of the two-upper-lower felt, then comb the velvet, and treat and level the surfaces of the two-upper-lower felt.
By adopting the scheme, when the wet paper web A is squeezed and dewatered in the squeezing part, the flatness of the surface of the wet paper web A is related to the flatness of the surface of the upper and lower felts of the two presses, and fine wool is implanted into the surface of the upper and lower felts of the two presses through the iSmooth technology flocking, so that the surface of the upper and lower felts of the two presses is smoother, the flatness of the surface of the wet paper web B is improved, the roughness of the surface of the wet paper web B is reduced, and the subsequent coating is facilitated.
Preferably, in step S1, the wet paper web a has a dryness of 20 to 22%.
By adopting the scheme, the dryness of the wet paper web A is controlled within a certain range, and the subsequent squeezing and dewatering are facilitated.
Preferably, in step S2, the dryness of the wet paper web B is 49 to 51%.
By adopting the scheme, the dryness of the wet paper web B is controlled within a certain range, and the subsequent coating is facilitated.
Preferably, in step S3, the coating weight of the knife coating is 35-41 g/m2。
By adopting the scheme, the coating can completely cover the surface of the base paper.
The invention also provides the coated paper produced by the production process.
Preferably, the roughness of the surface of the coated paper is 0.70-1.11 μm.
The invention has the following beneficial effects: according to the invention, the ULTRAEL surface ironing technology is utilized to process the surface layer forming net, the two upper and lower felts in extrusion dehydration are subjected to flocking treatment by adopting a Dynatex300 ultra-smooth base net and simultaneously matching with the iSmooth technology on the surfaces of the two upper and lower felts, and through double optimization of the surface layer forming net and the two upper and lower felts, the surface of the produced base paper is smoother, the coating covering is more uniform, and the surface roughness of the obtained coated paper is greatly reduced.
Drawings
Fig. 1 is a schematic view of a forming net for a face layer of the present invention, the left view is a schematic view of the forming net for the face layer before being processed by using an ULTRAEL surface ironing technique, and the right view is a schematic view of the forming net for the face layer after being processed by using the ULTRAEL surface ironing technique.
Fig. 2 is a microscopic enlarged view of the two upper and lower felts according to the present invention, the left view is a microscopic enlarged view of the two upper and lower felts before flocking treatment by using a Dynatex300 ultra-smooth base net simultaneously in cooperation with the two upper and lower felt surface iswood technology, and the right view is a microscopic enlarged view of the two upper and lower felts after flocking treatment by using a Dynatex300 ultra-smooth base net simultaneously in cooperation with the two upper and lower felt surface iswood technology.
FIG. 3 is an electron microscope image of the base paper of the present invention before and after optimization, the left image is an electron microscope image of the base paper of the present invention before optimization, and the right image is an electron microscope image of the base paper of the present invention after optimization.
FIG. 4 is an electron microscope image before and after the optimization of the coated paper of the present invention, the left image is an electron microscope image before the optimization of the coated paper of the present invention, and the right image is an electron microscope image after the optimization of the coated paper of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
A production process of novel low-roughness coated paper comprises the following steps:
s1: cloth pulp forming and compounding
Respectively distributing slurry on the surface layer, the lining layer, the core layer and the bottom layer to form four layers, and then combining the four layers layer by layer to form a wet paper web A, wherein the dryness of the wet paper web A is 20-22%;
s2: squeezing and dewatering
Conveying the wet paper web A into a press part, and carrying out mechanical squeezing dehydration on the wet paper web A to obtain a wet paper web B, wherein the dryness of the wet paper web B is 49-51%;
s3: coating of
Drying, sizing and hard calendaring the wet paper web B to obtain base paper, and performing knife coating to obtain coated paper, wherein the coating weight of the knife coating is 35-41 g/m2；
When the surface sizing agent is subjected to sizing forming in the step S1, the surface forming net is processed by an ULTRAEL surface ironing technology, namely, hot-press forming is carried out through a hot plate, salient points of the surface forming net are ironed and leveled, in the step S2, when wet paper web is subjected to mechanical squeezing dehydration, a Dynatex300 ultra-smooth base net is adopted for the upper and lower felts, the surfaces of the upper and lower felts are subjected to flocking processing through an iSmooth technology, namely, fine and smooth flocks are implanted into the surfaces of the upper and lower felts, then the flocks are carded, and the surfaces of the upper and lower felts are processed and leveled.
Fig. 1 is a schematic view of a surface layer forming net of the present invention, the left view is a schematic view of the surface layer forming net before being processed by using an ULTRAEL surface ironing technology, and the right view is a schematic view of the surface layer forming net after being processed by using the ULTRAEL surface ironing technology, as can be seen from fig. 1, the salient points of the processed surface layer forming net are ironed, and the surface of the surface layer forming net is smoother.
Fig. 2 is a microscopic enlarged view of the two upper and lower felts according to the present invention, the left view is a microscopic enlarged view of the two upper and lower felts before flocking treatment by using a Dynatex300 ultra-smooth base net simultaneously in cooperation with the two upper and lower felt surface iswood technology, the right view is a microscopic enlarged view of the two upper and lower felts after flocking treatment by using a Dynatex300 ultra-smooth base net simultaneously in cooperation with the two upper and lower felt surface iswood technology, and it can be seen from fig. 2 that the surface flocking of the treated two upper and lower felts is fine and smooth, and the flatness is higher.
FIG. 3 is an electron microscope image of the base paper of the present invention before and after optimization, the left image is an electron microscope image of the base paper of the present invention before optimization, and the right image is an electron microscope image of the base paper of the present invention after optimization; FIG. 4 is an electron microscope image before and after optimization of the coated paper of the present invention, the left image is an electron microscope image before optimization of the coated paper of the present invention, and the right image is an electron microscope image after optimization of the coated paper of the present invention; as can be seen from fig. 3 and 4, through the double optimization of the surface layer forming net and the two upper and lower felts, the grain of the base paper is adjusted, the surface of the produced base paper is smoother than that of the base paper before optimization, and the coating covering is more uniform than that of the coating before optimization.
Examples 2 to 6
The experimental parameters and specific experimental results of examples 2-6 are detailed in tables 1 and 2, and other experimental parameters are the same as in example 1.
TABLE 1 Experimental parameters for examples 2-6
| Experimental group | Kind of base paper | Basis weight gsm | Paper machine speed m/min | Coating weight g/m2 |
| Example 2 | Coating ox card | 200 | 800 | 35.8 |
| Example 3 | White ash of earthworm | 230 | 830 | 37.6 |
| Example 4 | White ash of earthworm | 250 | 830 | 37.8 |
| Example 5 | White bottom of river dragon | 240 | 835 | 40.2 |
| Example 6 | White bottom of river dragon | 290 | 780 | 41.0 |
Table 2 roughness of coated papers of examples 2-6
Table 2 shows the roughness of the coated papers of examples 2 to 6, the national standard roughness requirement of the coated paper is not more than 1.8 μm, the roughness requirement of the low-roughness coated paper is not more than 1.2 μm, and the roughness of the coated papers of examples 2 to 6 is significantly lower than that of the two, which indicates that the coated paper produced by the production process of the present invention satisfies the roughness requirement, and the surface roughness of the obtained coated paper is greatly reduced by the double optimization of the surface layer forming net and the two upper and lower felts.
Therefore, the coated paper produced by the production process can be suitable for printing more exquisite, finer and more beautiful printing products, can particularly meet the higher requirement of printing of light-color ink positions on paper surface covering, can enable high-grade printing paper to cover a wider range of ink positions in future market competition, and has more exquisite patterns, higher cost performance and stronger competitiveness.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A production process of novel low-roughness coated paper comprises the following steps:
s1: cloth pulp forming and compounding
Respectively distributing slurry on the surface layer, the lining layer, the core layer and the bottom layer to form four layers, and then combining the four layers layer by layer to form a wet paper web A;
s2: squeezing and dewatering
Conveying the wet paper web A into a press part, and mechanically squeezing and dewatering the wet paper web A to obtain a wet paper web B;
s3: coating of
Drying, sizing and hard calendering the wet paper web B to obtain base paper, and then carrying out scraper type coating to obtain coated paper;
the method is characterized in that when the surface layer sizing agent is subjected to pulp distribution forming in the step S1, a surface layer forming net is processed by an ULTRAEL surface ironing technology, when wet paper webs are subjected to mechanical squeezing dehydration in the step S2, a Dynatex300 ultra-smooth base net is adopted as the upper and lower coarse cloths, and the surfaces of the upper and lower coarse cloths are subjected to flocking processing by an iSmooth technology.
2. The production process of the novel low-roughness coated paper is characterized in that the ULTRAEL surface ironing technology is specifically that the convex points of a surface layer forming net are ironed and flattened by hot-pressing and shaping through a hot plate.
3. The production process of the novel low-roughness coated paper is characterized in that fine velvet is implanted into the surfaces of the two upper and lower felts in the iSmooth technology flocking process, then the velvet is carded, and the surfaces of the two upper and lower felts are processed and leveled.
4. The production process of the novel low-roughness coated paper is characterized in that in the step S1, the dryness of the wet paper web A is 20-22%.
5. The production process of the novel low-roughness coated paper is characterized in that in the step S2, the dryness of the wet paper web B is 49-51%.
6. The production process of the novel low-roughness coated paper is characterized in that in the step S3, the coating weight of the doctor blade coating is 35-41 g/m2。
7. A coated paper, characterized in that it is produced by a production process according to any one of claims 1 to 6.
8. The coated paper according to claim 7, wherein the roughness of the surface of the coated paper is 0.70 to 1.11 μm.
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| CN202010770808.3A CN111851118B (en) | 2020-08-04 | 2020-08-04 | Production process of low-roughness coated paper and coated paper |
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