CN108914704B - Production method of heat-sensitive plate base paper - Google Patents
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- 238000001035 drying Methods 0.000 claims abstract description 80
- 239000000835 fiber Substances 0.000 claims abstract description 69
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 18
- 238000004513 sizing Methods 0.000 claims abstract description 17
- 238000007639 printing Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 33
- 239000000725 suspension Substances 0.000 claims description 19
- 238000010009 beating Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 7
- 238000007605 air drying Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000007651 thermal printing Methods 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract 6
- 230000001276 controlling effect Effects 0.000 description 14
- 238000004537 pulping Methods 0.000 description 13
- 238000007865 diluting Methods 0.000 description 10
- 238000007602 hot air drying Methods 0.000 description 10
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- 238000002156 mixing Methods 0.000 description 10
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- 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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Abstract
The invention discloses a production method of heat-sensitive plate base paper, which comprises the following steps of firstly preparing a sizing agent, wherein the sizing agent is a mixture of linear-structure PET fibers, T-shaped PET fibers and northern wood pulp fibers; secondly, after the sizing agent is diluted, purified and screened, the sizing agent is divided into two parts which enter two sizing agent pipelines, the two parts flow into the same head box through the two sizing agent pipelines, and then wet paper web forming is carried out; and finally drying the wet paper web to obtain the base paper of the thermal-sensitive plate. The invention obviously improves the quality of the domestic heat-sensitive plate paper products and improves the printing effect and the durable times of the heat-sensitive plate paper products.
Description
Technical Field
The invention belongs to the field of special paper, and particularly relates to a production method of thermosensitive version base paper for a computer all-in-one machine.
Background
Heat-sensitive printing plate paper (also called heat-sensitive wax paper in the printing industry) is generally formed by compounding base paper and a polyester film. The base paper is mainly used as a support material of the heat-shrinkable resin film and needs to have certain rigidity and strength so as to ensure the smoothness of printing after the heat-sensitive plate paper is arranged on a machine; the film is used as a barrier material of the printing ink, is generally made of a PET material, has extremely strong tensile strength, has a melting point of 255-260 ℃, and has a thickness of less than 5 mu m after being compounded. As a support structure of the thermosensitive version paper and a load structure of the printing ink, the structure and the performance of the base paper have obvious influence on the performance of the thermosensitive version paper. The base paper has a basis weight of 10 to 12g/m2Plant fibers and synthetic fibers are often used for papermaking. Meanwhile, in order to improve the strength of the base paper, the strength and the wet strength of the base paper are generally improved by coating an acrylic resin reinforcing agent, which facilitates the compounding operation with the film.
In the 90 s of the 20 th century, the countries of Japan and Germany began to research and produce heat-sensitive stencil paper and holesA tissue paper for printing plate base paper is prepared from leaf fibers of manila hemp, ecuador hemp, pineapple hemp, new Zealand hemp, etc., bast fibers of flax, jute, taro hemp, kenaf, etc., and PET synthetic fibers through mixing, wet-making in inclined net paper machine, coating acrylic resin on the outside of machine for reinforcing, and coating in 1-1.5g/m2. At present, similar products are developed in China to be put on the market, however, the final thermosensitive version paper is caused by low strength and small porosity of the base paper, and compared with similar products abroad, the final thermosensitive version paper is lower in strength and less in number of printable sheets. In order to solve the product quality problem caused by insufficient raw material stability and improve the strength and porosity of domestic thermal-sensitive plate base paper, CN 201210292944.1 changes the fiber proportion of the thermal-sensitive plate base paper, LPET/PET low-melting-point two-component polyester ultrashort fibers, PET polyester ultrashort fibers, viscose fibers, northern wood pulp and the like are used for preparing the thermal-sensitive plate base paper under the dispersion of a polyacrylamide dispersant, and the thermal-sensitive plate base paper is produced after slitting and coating of acrylic resin. The use of the bi-component polyester ultra-short fiber with the sheath-core structure improves the base paper performance and obviously improves the performance of the thermosensitive version paper.
However, the bicomponent polyester ultrashort fiber with the sheath-core structure is expensive, which is not beneficial to reducing the cost of the heat-sensitive plate base paper; meanwhile, in order to ensure effective combination among fibers, the use of the dual-component polyester ultrashort fiber needs to ensure that the drying temperature of the paper reaches the melting temperature of the polymer at the outer layer of the dual-component polyester ultrashort fiber, and the fiber is hot-melted, so that the diameter of the fiber is reduced, the thickness of the paper is reduced, and the improvement of the porosity of the paper is not facilitated; more importantly, the melting of the outer layer of the fiber brings about the adhesion of the paper to the drying cylinder and the dry net, and the paper is frequently broken, so that the production efficiency is low. The covalent bonds present between the bonded fibres also cause difficulties in recycling the broke.
Disclosure of Invention
Aiming at the defects of the production process of the thermal-sensitive plate base paper and the current situation of poor base paper performance, the invention provides the production method of the thermal-sensitive plate base paper, which is used for obviously improving the quality of domestic thermal-sensitive plate paper products and improving the printing effect and the durability times of the domestic thermal-sensitive plate paper products.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method of heat-sensitive plate base paper comprises the following steps:
the method comprises the following steps: preparing a slurry, wherein the slurry is a mixture of linear structure PET fibers, T-shaped PET fibers and northern wood pulp fibers;
step two: after being diluted, purified and screened, the pulp is divided into two parts which enter two pulp pipelines, and the two parts flow into the same head box through the two pulp pipelines, and then wet paper web forming is carried out;
step three: and drying the wet paper web to obtain the heat-sensitive plate base paper.
Further, in the first step, the oven dry mass ratio of the linear structure PET fibers to the T-shaped PET fibers is (7-9): (3-1), the linear structure PET fibers and the T-shaped PET fibers form mixed PET fibers, and the oven dry mass ratio of the mixed PET fibers to the northern wood pulp fibers is (6-7): (4-3).
Further, in the first step, the beating degrees of the linear structure PET fibers and the T-shaped PET fibers are controlled to be 7-10 degrees SR; the beating degree of the northern wood pulp is 42-47 DEG SR.
Further, in the two slurry pipelines in the step two: the volume ratio of the slurry is 1 (0.8-1.2), the flow velocity ratio of the slurry is 1: (1.01-1.03).
Further, in the second step, the wet paper web is formed by an inclined wire former, and the inclined angle of the inclined wire is 10-20 degrees.
Further, the drying process in the third step specifically comprises: the method comprises the steps of drying a wet paper web in a hot air penetration mode, performing surface finishing by using a first drying cylinder, performing sizing reinforcement on the paper subjected to the surface finishing, drying by using a suspension type drying oven, and further drying and performing surface finishing by using a second drying cylinder to obtain the thermosensitive version base paper.
Further, in the hot air through drying, the temperature of hot air is 80-110 ℃, the air speed is 400-800L/min, and the mass fraction of the water content of the paper after the hot air through drying is 5-20%.
Further, the surface temperature of the first cylinder is 80-100 ℃.
Further, the drying temperature of the suspension type drying oven is 130-.
Further, the surface temperature of the second cylinder is 80-100 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention realizes the surfing of the pulp by using the double pulp pipelines, changes the distribution state of the fiber in the aqueous solution by using the friction kneading and diffusion effects of the combination interface of the ejected fluid in the two channels, ensures that a certain arrangement angle exists between part of the fiber and the plane of the paper after the fiber is formed, and improves the bulk of the formed paper; in addition, the T-shaped PET fibers are used, the net part is used for filtering water to form dehydration suction force, so that part of the fibers exist in a mode of being almost vertical to the plane of the paper, the fibers are alternately built, the fiber network structure of the paper is enhanced, the internal pore structure of the paper is regulated and controlled, the ink absorption capacity of the paper and the distribution state of absorbed ink are improved, the strength of the raw paper of the thermosensitive plate is obviously improved, and the number of the thermosensitive plate paper prepared by the raw paper is effectively increased by the technical means.
Furthermore, the wet paper is dried by using through-air drying (TAD) by changing the drying mode of the conventional wet paper, and compared with the conventional drying cylinder in which the whole width of the wet paper is subjected to the tension of a dry net, the TAD only enables part of the wet paper to be subjected to the tension of the dry net, thereby effectively reducing the influence of drying under pressure on the thickness of the paper and further improving the porosity of the paper.
Furthermore, the invention controls the size of the holes in the paper by controlling the devillicate brooming degree of the plant fiber under the condition of constant porosity, thereby realizing the control of the distribution state of the ink absorbed by the paper in the printing process.
Detailed Description
Embodiments of the invention are described in further detail below:
1. slurry preparation
(1) Mixing and defibering linear structure PET fibers and T-shaped PET fibers according to the mass ratio of (7-9) to (3-1) or slightly pulping until the degree of pulping is 7-10 DEG SR for backup, pulping by using northern wood pulp until the degree of pulping is 42-47 DEG SR, and keeping the wet weight of 8-10g for backup; the linear structure PET fiber is PET fiber (0.2-1.5Dtex is multiplied by 5mm) in a straight line segment form, and the T-shaped PET fiber is PET fiber in a T-shaped form like English letters (the length ratio of three line segments of the T-shaped structure is 1:1:1, and the sizes of the three line segments are all 0.2-1.5Dtex is multiplied by 5 mm).
(2) Mixing 60-70% of mixed PET fibers and 30-40% of northern wood pulp in a pulp preparation tank, adding a dispersant, and then feeding into a pulping tank for later use.
2. Paper material feeding and wet paper web forming
(1) Diluting the slurry in the slurry forming pool by a fan pump, removing heavy impurities by a sand remover, secondarily diluting, removing coarse impurities by a pressure screen, and respectively feeding the purified slurry into a double-channel head box by two pipelines; controlling the volume ratio of the slurry in the two pipelines to be 1 (0.8-1.2), and controlling the flow velocity ratio to be 1: (1.01-1.03).
(2) The pulp of the double-channel pulp flowing box is mixed after passing through a bleaching sheet, and is dehydrated and formed on the inclined wire, and the inclination angle of the inclined wire is controlled to be 10-20 degrees.
3. Drying and shaping wet paper web
(1) The wet paper web is carried by a dry net and then enters a hot air penetrating type drying cylinder for drying, the hot air drying temperature is controlled to be 80-110 ℃, the air speed is controlled to be 400-;
(2) after the hot air drying, the paper sheet enters a drying cylinder with the temperature of 80-100 ℃ for further drying, and the surface finishing is realized;
(3) feeding the surface finishing paper sheet into a sizing machine for gluing and reinforcing, and then conveying the paper sheet into a suspension type drying oven for drying, wherein the drying temperature of the suspension type drying oven is 130-;
(4) and (4) after suspension drying, feeding the paper into a drying cylinder with the temperature of 80-100 ℃ for further drying, and realizing surface finishing, curling and cutting.
The present invention is described in further detail below with reference to examples:
example 1
(1) Mixing and defibering linear structure PET fibers and T-shaped PET fibers according to the mass ratio of 9:1 until the beating degree is 7 DEG SR for later use, beating with northern wood pulp until the beating degree is 42 DEG SR, and keeping the wet weight of 10g for later use;
(2) 70% of mixed PET fiber and 30% of northern wood pulp are mixed in a pulp preparation tank, and then the mixture enters a pulping tank for standby after a dispersant is added.
2. Paper material feeding and wet paper web forming
(1) Diluting the slurry in the slurry forming pool by a fan pump, removing heavy impurities by a sand remover, secondarily diluting, removing coarse impurities by a pressure screen, and respectively feeding the purified slurry into a double-channel head box by two pipelines; controlling the volume ratio of slurry in the two pipelines to be 1:0.8, and controlling the flow velocity ratio to be 1: 1.01.
(2) the pulp of the double-channel pulp flowing box is mixed after passing through a bleaching sheet, and is dehydrated and formed on the inclined wire, and the inclination angle of the inclined wire is controlled to be 10 degrees.
3. Drying and shaping wet paper web
(1) Carrying the wet paper web by a dry net, and then drying the wet paper web in a hot air penetrating type drying cylinder, controlling the hot air drying temperature at 110 ℃, the air speed at 400L/min, and drying until the moisture content is 10%;
(2) after the hot air drying, the paper sheet enters a drying cylinder with the temperature of 100 ℃ for further drying, and the surface finishing is realized;
(3) feeding the surface-finished paper sheets into a sizing machine for sizing and reinforcing, and then conveying the paper sheets into a suspension type oven for drying, wherein the drying temperature of the suspension type oven is 170 ℃, and the air speed is 260L/min;
(4) and (4) after suspension drying, the paper enters a drying cylinder with the temperature of 100 ℃ for further drying, and the paper is curled and cut after surface finishing.
Example 2
1. Slurry preparation
(1) Mixing and pulping the linear structure PET fiber and the T-shaped PET fiber according to the mass ratio of 8:2 until the pulping degree is 10 DEG SR for later use, pulping by using northern wood pulp until the pulping degree is 47 DEG SR, and keeping the wet weight of 8g for later use;
(2) mixing 65% of mixed PET fiber and 35% of northern wood pulp in a pulp preparation tank, adding a dispersing agent, and then entering a pulping tank for later use.
2. Paper material feeding and wet paper web forming
(1) Diluting the slurry in the slurry forming pool by a fan pump, removing heavy impurities by a sand remover, secondarily diluting, removing coarse impurities by a pressure screen, and respectively feeding the purified slurry into a double-channel head box by two pipelines; controlling the volume ratio of slurry in the two pipelines to be 1:1.2, and controlling the flow velocity ratio to be 1: 1.03.
(2) the pulp of the double-channel pulp flowing box is mixed after passing through a bleaching sheet, and is dehydrated and formed on the inclined wire, and the inclination angle of the inclined wire is controlled to be 17 degrees.
3. Drying and shaping wet paper web
(1) Carrying the wet paper web by a dry net, and then drying the wet paper web in a hot air penetrating type drying cylinder, controlling the hot air drying temperature to be 80 ℃, the air speed to be 800L/min, and drying the wet paper web until the moisture content is 5%;
(2) after the hot air drying, the paper sheet enters a drying cylinder with the temperature of 80 ℃ for further drying, and the surface finishing is realized;
(3) feeding the surface-finished paper sheets into a sizing machine for sizing and reinforcing, and then feeding the paper sheets into a suspension type oven for drying, wherein the drying temperature of the suspension type oven is 150 ℃, and the air speed is 350L/min;
(4) and (4) after suspension drying, the paper enters a drying cylinder with the temperature of 80 ℃ for further drying, and the paper is curled and cut after surface finishing.
Example 3
1. Slurry preparation
(1) Mixing and defibering linear structure PET fibers and T-shaped PET fibers according to the mass ratio of 7:3 until the beating degree is 8 DEG SR for later use, beating with northern wood pulp until the beating degree is 45 DEG SR, and keeping the wet weight at 8.8g for later use;
(2) mixing 60% of mixed PET fiber and 40% of northern wood pulp in a pulp preparation tank, adding a dispersing agent, and then entering a pulping tank for later use.
2. Paper material feeding and wet paper web forming
(1) Diluting the slurry in the slurry forming pool by a fan pump, removing heavy impurities by a sand remover, secondarily diluting, removing coarse impurities by a pressure screen, and respectively feeding the purified slurry into a double-channel head box by two pipelines; controlling the volume ratio of slurry in the two pipelines to be 1:1, and controlling the flow velocity ratio to be 1: 1.03. .
(2) The pulp of the double-channel pulp flowing box is mixed after passing through a bleaching sheet, and is dehydrated and formed on the inclined wire, and the inclination angle of the inclined wire is controlled to be 20 degrees.
3. Drying and shaping wet paper web
(1) Carrying the wet paper web by a dry net, and then drying the wet paper web in a hot air penetrating type drying cylinder, controlling the hot air drying temperature to be 85 ℃, the air speed to be 550L/min, and drying until the moisture content is 20%;
(2) after the hot air drying, the paper sheet enters a drying cylinder with the temperature of 95 ℃ for further drying, and the surface finishing is realized;
(3) feeding the surface-finished paper sheets into a sizing machine for sizing and reinforcing, and then feeding the paper sheets into a suspension type oven for drying, wherein the drying temperature of the suspension type oven is 130 ℃, and the air speed is 400L/min;
(4) and (4) after suspension drying, feeding the paper into a drying cylinder with the temperature of 95 ℃ for further drying, and realizing surface finishing, curling and cutting.
Example 4
1. Slurry preparation
(1) Mixing and defibering linear structure PET fibers and T-shaped PET fibers according to the mass ratio of 8.5:1.5 until the beating degree is 9 DEG SR for later use, beating with northern wood pulp until the beating degree is 46 DEG SR, and keeping the wet weight at 9.7g for later use;
(2) mixing 65% of mixed PET fiber and 35% of northern wood pulp in a pulp preparation tank, adding a dispersing agent, and then entering a pulping tank for later use.
2. Paper material feeding and wet paper web forming
(1) Diluting the slurry in the slurry forming pool by a fan pump, removing heavy impurities by a sand remover, secondarily diluting, removing coarse impurities by a pressure screen, and respectively feeding the purified slurry into a double-channel head box by two pipelines; controlling the volume ratio of slurry in the two pipelines to be 1:1.1, and the flow velocity ratio to be 1: 1.02.
(2) the pulp of the double-channel pulp flowing box is mixed after passing through a bleaching sheet, and is dehydrated and formed on the inclined wire, and the inclination angle of the inclined wire is controlled to be 19 degrees.
3. Drying and shaping wet paper web
(1) Carrying the wet paper web by a dry net, then entering a hot air penetrating type drying cylinder, controlling the hot air drying temperature to be 97 ℃, the air speed to be 520L/min, and drying until the moisture content is 12%;
(2) after the hot air drying, the paper sheet enters a drying cylinder with the temperature of 90 ℃ for further drying, and the surface finishing is realized;
(3) feeding the surface-finished paper sheets into a sizing machine for sizing and reinforcing, and then feeding the paper sheets into a suspension type oven for drying, wherein the drying temperature of the suspension type oven is 200 ℃, and the air speed is 150L/min;
(4) and (4) after suspension drying, feeding the paper into a drying cylinder with the temperature of 90 ℃ for further drying, and realizing surface finishing, curling and cutting.
The main technical indexes of the product obtained in the embodiment of the invention are shown in table 1:
TABLE 1 technical indices of the products obtained in the examples of the invention
Claims (7)
1. The production method of the base paper of the thermal-sensitive plate is characterized by comprising the following steps:
the method comprises the following steps: preparing a slurry, wherein the slurry is a mixture of linear structure PET fibers, T-shaped PET fibers and northern wood pulp fibers; the oven-dry mass ratio of the linear structure PET fibers to the T-shaped PET fibers is (7-9) to (3-1), the linear structure PET fibers and the T-shaped PET fibers form mixed PET fibers, and the oven-dry mass ratio of the mixed PET fibers to the northern wood pulp fibers is (6-7): (4-3);
step two: after being diluted, purified and screened, the pulp is divided into two parts which enter two pulp pipelines, and the two parts flow into the same head box through the two pulp pipelines, and then wet paper web forming is carried out; wherein, in two thick liquids pipelines: the volume ratio of the slurry is 1 (0.8-1.2), the flow velocity ratio of the slurry is 1: (1.01-1.03);
step three: the method comprises the steps of drying a wet paper web in a hot air penetration mode, performing surface finishing by using a first drying cylinder, performing sizing reinforcement on the paper subjected to the surface finishing, drying by using a suspension type drying oven, and finally drying and performing surface finishing by using a second drying cylinder to obtain the thermosensitive version base paper.
2. The method for producing thermal printing base paper according to claim 1, wherein the degree of beating of the linear structure PET fibers and the T-type PET fibers in the first step are controlled to be 7-10 ° SR; the beating degree of the northern wood pulp is 42-47 DEG SR.
3. The method of claim 1, wherein the wet paper web forming is performed by a wire former in the second step, and the angle of inclination of the wire is 10 to 20 °.
4. The method for producing thermal sensitive printing original paper as claimed in claim 1, wherein the temperature of hot air in the through-air drying is 80-110 ℃, the air speed is 400-800L/min, and the moisture mass fraction of the paper after through-air drying is 5% -20%.
5. The method for producing thermal printing base paper as claimed in claim 1, wherein the first dryer surface temperature is 80-100 ℃.
6. The method for producing thermal sensitive printing original paper as claimed in claim 1, wherein the drying temperature of the suspension type oven is 130-200 ℃, and the wind speed is 150-400L/min.
7. The method of claim 1, wherein the second dryer surface temperature is 80-100 ℃.
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| CN102787531B (en) * | 2012-08-17 | 2014-10-22 | 浙江华凯纸业有限公司 | Raw paper of heat-sensitive board paper of all-in-one machine |
| CN204551133U (en) * | 2014-12-29 | 2015-08-12 | 圣欧芳纶（江苏）股份有限公司 | A kind of meta-aramid insulating paper of imitative rice paper |
| CN104790245B (en) * | 2015-03-25 | 2017-05-10 | 石家庄天略工业用布有限公司 | High-strength support filter paper for tubular films and preparation method of high-strength support filter paper for tubular films |
| CN104831578A (en) * | 2015-04-20 | 2015-08-12 | 岳阳林纸股份有限公司 | Preparation method of high-grade thermosensitive base paper |
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| CN108914704A (en) | 2018-11-30 |
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