阅读说明：本技术 纸面颜色不换线正常生产转换工艺 (Normal production conversion process without changing paper surface color ) 是由 黎桂华 陈绍峰 于 2020-02-28 设计创作，主要内容包括：一种纸面颜色(在不停机或断纸情况下)可以在线生产中直接转换调色工艺,用于将第一纸种的生产线切换为生产第二纸种的生产线,其中第一纸种纸面颜色a值要求为+1.3～+1.45、b值要求为-1.8～-2.0,第二纸种的纸面颜色a值要求0左右、b值要求-4.0左右,本发明纸面颜色不换线正常生产转换工艺的有益效果在于：通过改变生产工艺技术流程,进而使得在实际生产中,可以在不换线的情况下,完成产线的转换,有益提高生产效率,节约生产成本。(A kind of paper color (under the situation of not shutting down or breaking paper) can change the color mixing process directly in the online production, the production line used for switching the first paper kind to produce the second paper kind, wherein the paper color a value of the first paper kind requires + 1.3- +1.45, b value requires-1.8- + 2.0, the paper color a value of the second paper kind requires about 0, b value requires about-4.0, the paper color of the invention does not change the line and produces the normal conversion process the beneficial effect lies in: by changing the technical process of the production process, the conversion of production lines can be completed without changing the lines in actual production, thereby being beneficial to improving the production efficiency and saving the production cost.)

1. A normal production conversion process for color of a paper surface without changing lines is characterized by comprising the following steps:

1) confirming the actual time of the second paper type, preparing the pre-coating, middle-coating and top-coating coatings, and controlling the liquid level usage of each coating storage tank;

2) carrying out the process treatments of pre-coating, middle coating and top coating 60min before transferring, and preparing a blank coating without adding purple and blue dyes in a pot in a preparation tank for preparation;

3) 15min before transferring, the liquid level of the precoating paint storage tank is controlled at 5-8%. The feed tank liquid level was controlled at 40%. Adding the pigment standard purple and blue pigments of a second paper type into the pre-coating paint to be prepared in the preparation tank at once according to the actual liquid levels of the storage tank and the feeding tank, stirring at a low speed for 5min, then placing the storage tank, stirring for 5min after mixing, stirring again for 5min, feeding the feeding tank again, and simultaneously adding the purple and blue pigments on line in the feeding tank for adjustment;

4) and 15min before transferring, controlling the liquid level of a middle coating storage tank to be 5-8%. The feed tank liquid level was controlled at 40%. According to the actual liquid levels of a storage tank and a feeding tank, a second paper pigment standard purple and blue pigments are added into the to-be-fed intermediate coating of the preparation tank at once, the mixture is stirred at a low speed for 5min and then placed in the storage tank, the mixture is stirred for 5min and then fed into the feeding tank again, and the feeding tank is simultaneously supplemented with the purple and blue pigments online for adjustment;

5) and 15min before transferring, controlling the liquid level of the top coating storage tank at 8-10%. The feed tank liquid level was controlled at 40%. Adding purple and blue pigments in a preparation tank to be coated in the surface coating material once according to the actual liquid levels of a storage tank and a feeding tank, stirring at a low speed for 5min, then placing the storage tank, stirring for 5min, then feeding the materials into the feeding tank again, and simultaneously adding the purple and blue pigments on line in the feeding tank for adjustment;

6) detecting the data of L, a and b immediately after the finished paper is rolled down, and properly adding or reducing the addition of purple and blue pigments in the top coating to meet the color quality requirement in the control range according to the paper surface color standard of the second paper type;

7) after the paper is transferred, the physical indexes of the surface pulp are L value (90-92), a value (2.5-3.5), b value (-2.5) - (-3.5) and whiteness (80-85), and the stable point is controlled as much as possible to reduce the large fluctuation of a value and b value of the finished paper.

8) After the paper is transferred, the coating weight of the pre-middle coating is required to be controlled stably, wherein 15-16g of pre-coating, 10-11g of middle coating and 15-16g of top coating have low coating weight, and the ab value of the finished paper is greatly influenced.

2. The process of claim 1 for converting normal production of paper color without changing line,

in step 1, the preparation process of the pre-coating, the middle coating and the top coating is as follows:

1) pre-coating start-up procedure: adding GCC-60 → stirring at low speed for 1 minute → stirring at high speed → foam inhibitor → dispersant, clear water → thickener → coating starch → CBC starch → high speed and low speed → blue dye → purple dye → water repellent → lubricant → caustic soda → latex → stopping the stirrer, and ending the process;

2) the start program of the intermediate coating: (addition) GCC-65 → low speed stirring for 1 minute → high speed stirring → foam inhibitor → 1# china clay → dispersant, clear water → thickener → coating starch → CBC starch → high speed low speed stirring → blue dye → purple dye → water repellent → lubricant → caustic soda → latex → stop the stirrer, and the procedure is finished;

3) the surface coating paint starting program comprises the following steps: adding GCC-95 → stirring at low speed for 1 minute → stirring at high speed → foam inhibitor → 1# china clay → dispersant, clear water → high speed stirring at low speed → water repellent → lubricant → caustic soda → latex → VAE latex → rheological agent → stopping the stirrer, and sampling to test the solid content, viscosity, PH value and temperature of the coating. And → the addition amount of the supplemented blue and purple dyes is adjusted again according to the ab value of the finished paper → the stirrer is started to stir at low speed → the blue dye → the purple dye → the stirring and dispersing are carried out for 5min, the program operation is stopped → the low-speed rotation and high-speed rotation → the thickener → the stirrer is stopped, and the paint solid content, the viscosity, the PH value and the temperature are sampled and tested. And → the addition amount of the replenished blue and purple dyes is adjusted according to the ab value of the finished paper → the stirrer is started to stir at low speed → the blue dyes → the purple dyes → the program operation is stopped after stirring and dispersing for 5 min.

3. The process of claim 2 for converting normal production of paper color without changing line,

in step 2, the flow of the coating machine and the coater is as follows:

1) pre-coating and coating machine-arranging flow: coating preparation → sampling detection → coating storage tank → vibrating screen → feed tank → pressure screen → coating feeding tray → scraper coating → reflux coarse screen → feed tank → continuous circulation feeding when production is normal;

2) the process of the floating coat coating machine comprises the following steps: coating preparation → sampling detection → coating storage tank → vibrating screen → feed tank → pressure screen → coating feeding tray → scraper coating → reflux coarse screen → feed tank → continuous circulation feeding when production is normal;

3) the top coating and coating process comprises the following steps: coating preparation → sampling detection → coating storage tank → vibrating screen → feed tank → pressure screen → coating feeding tray → scraper coating → reflux vibrating screen → feed tank → continuous circulation feeding when production is normal.

Technical Field

The invention relates to a paper product production process, in particular to a normal production conversion process without changing the color of a paper surface.

Background

The high-grade coated white board paper is mainly used for packaging higher-grade commodities such as toys, shoes, cigarettes, wines, cosmetics and the like. Along with the continuous improvement of the material and cultural living standard of people and the continuous enhancement of aesthetic consciousness, higher and higher requirements are provided for the printing effect of the packaging paper board, which not only can meet the development of printing towards high speed, multicolor and automation, but also can meet the requirement that high-quality exquisite printed matters can be obtained under different printing conditions. The white coated paper has the characteristics of being suitable for packaging, and the key index is printability, namely printability of the paper, which is the condition that the paper can meet the requirements of ink, a printing plate and printing conditions, so that the smooth operation of printing is ensured, and high-quality printed matters are obtained.

With the improvement of the papermaking process, the papermaking technology has developed rapidly, and the society puts forward higher and higher requirements on paper, and the color requirements on paper are more and more diversified, for example, white paper is produced in the same way, the last production requires that the value a of the paper surface is + 1.3- +1.45, the value b is-1.8-2.0, (the value a represents red green: a ↓representsred bias, a ↓representsgreen bias, the value b represents yellow blue, + ↓representsyellow, and ↓representsblue bias, the value L represents black and white, or brightness and darkness, + represents white, -represents dark). The a value of the next secondary product card paper is about 0, and the b value is about-4.0). The two varieties are numerically seen to be greatly different in color.

For the two types of paper, when switching production, the conventional process usually needs to be stopped, de-coated and reformed by the whole machine, but if the production is stopped, the production efficiency and the production cost of an enterprise are seriously affected, so that the conventional production process needs to be adjusted to complete the switching of the production line without stopping the production.

Disclosure of Invention

In view of the above, it is necessary to provide a normal production conversion process for changing paper color without changing lines in order to overcome the defects in the prior art.

The invention is realized by the following modes:

a normal production conversion process for color of a paper surface without changing lines is characterized by comprising the following steps:

1) and confirming the actual time of the second paper type, preparing the pre-coating, the middle coating and the top coating, and controlling the liquid level usage of each coating storage tank.

2) And performing the process treatments of pre-coating, middle coating and top coating 60min before transferring, and preparing a blank coating without adding purple and blue dyes in a pot in a preparation tank for preparation.

3) 15min before transferring, the liquid level of the precoating paint storage tank is controlled at 5-8%. The feed tank liquid level was controlled at 40%. Adding the pigment standard purple and blue pigments of a second paper type into the pre-coating material to be prepared in the preparation tank at once according to the actual liquid levels of the storage tank and the feeding tank, stirring at a low speed for 5min, then placing the storage tank, stirring for 5min after mixing, stirring again for 5min, feeding the feeding tank again, and simultaneously adding the purple and blue pigments on line in the feeding tank for adjustment.

4) And 15min before transferring, controlling the liquid level of a middle coating storage tank to be 5-8%. The feed tank liquid level was controlled at 40%. According to the actual liquid levels of the storage tank and the feeding tank, the second paper pigment standard purple and blue pigments are added into the to-be-prepared intermediate coating in the preparation tank at once, then the mixture is stirred at a low speed for 5min and then placed in the storage tank, the mixture is stirred for 5min and then the mixture is stirred again to be fed into the feeding tank, and the feeding tank is simultaneously supplemented with the purple and blue pigments online for adding and adjusting.

5) And 15min before transferring, controlling the liquid level of the top coating storage tank at 8-10%. The feed tank liquid level was controlled at 40%. Adding purple and blue pigments in the preparation tank to be coated in the top coating according to the actual liquid levels of the storage tank and the feeding tank, stirring at a low speed for 5min, then placing the storage tank, stirring for 5min, stirring again, feeding the materials into the feeding tank, and simultaneously adding the purple and blue pigments on line for adjustment.

6) And detecting the data of L, a and b immediately after the finished paper is rolled down, and properly adding or reducing the addition of purple and blue pigments in the top coating to meet the color quality requirement in the control range according to the paper surface color standard of the second paper type.

7) After the paper is transferred, the physical indexes of the surface pulp are L value (90-92), a value (2.5-3.5), b value (-2.5) - (-3.5) and whiteness (80-85), and the stable point is controlled as much as possible to reduce the large fluctuation of a value and b value of the finished paper.

8) After the paper is transferred, the coating weight of the pre-middle coating is required to be controlled stably, wherein 15-16g of pre-coating, 10-11g of middle coating and 15-16g of top coating have low coating weight, and the ab value of the finished paper is greatly influenced.

The paper surface color line-changing-free normal production conversion process has the beneficial effects that: by changing the technical process of the production process, the conversion of production lines can be completed without changing the lines in actual production, thereby being beneficial to improving the production efficiency and saving the production cost.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.

The embodiment provides a normal production conversion process without changing the paper color (under the condition of no stop or paper break), which is used for switching a production line of a first paper type to a production line of a second paper type, wherein the paper color a value of the first paper type is required to be +1.3 to +1.45, the b value is required to be-1.8 to-2.0, the paper color a value of the second paper type is required to be about 0, and the b value is required to be about-4.0, and the normal production conversion process without changing the paper color comprises the following steps:

1. and confirming the actual time of the second paper type, preparing the pre-coating, middle-coating and top-coating coatings, and controlling the liquid level usage of each coating storage tank.

2. And performing pre-coating, intermediate coating and top coating process 60min before transferring, and preparing a blank coating without adding purple and blue dyes in a pot in a preparation tank for preparation.

3. 15min before transferring, the liquid level of the precoating paint storage tank is controlled at 5-8%. The liquid level of the feed tank is controlled according to 40 percent. Adding the pigment standard purple and blue pigments of a second paper type into the pre-coating material to be prepared in the preparation tank at once according to the actual liquid levels of the storage tank and the feeding tank, stirring at a low speed for 5min, then placing the storage tank, stirring for 5min after mixing, stirring again for 5min, feeding the material in the feeding tank again, and simultaneously adding the purple and blue pigments on line in the feeding tank for adjustment.

4. The liquid level of the middle coating storage tank is controlled to be 5-8% 15min before transferring. The liquid level of the feed tank is controlled according to 40 percent. According to the actual liquid levels of the storage tank and the feeding tank, the second paper pigment standard purple and blue pigments are added into the to-be-prepared intermediate coating in the preparation tank at once, then the storage tank is placed after stirring at a low speed for 5min, the materials are stirred for 5min after mixing, the feeding tank is filled again, and the feeding tank is simultaneously supplemented with the purple and blue pigments online for adjustment.

5. The liquid level of the top coating storage tank is controlled at 8-10% 15min before transferring. The feed tank liquid level was controlled at 40%. Adding purple and blue pigments in the preparation tank to be coated in the top coating according to the actual liquid levels of the storage tank and the feeding tank, stirring at a low speed for 5min, then placing the storage tank, stirring for 5min, stirring again, feeding the materials into the feeding tank, and simultaneously adding the purple and blue pigments on line for adjustment.

6. And detecting the data of L, a and b immediately after the paper is rolled down, and adding or reducing the addition of purple and blue pigments in the top coating properly to meet the color quality requirement in the control range according to the paper surface color standard of the second paper.

7. After the paper is transferred, the physical indexes of the surface pulp are L value (90-92), a value (2.5-3.5), b value (-2.5) - (-3.5) and whiteness (80-85), and the stable point is controlled as much as possible to reduce the large fluctuation of a value and b value of the finished paper.

8. After the paper is transferred, the coating weight of the pre-middle coating is required to be controlled stably, wherein 15-16g of pre-coating, 10-11g of middle coating and 15-16g of top coating are adopted, and if the coating weight is low, the influence on the ab value of the finished paper is also large.

Wherein, in the step 1, the preparation flows of the pre-coating, the middle coating and the top coating are as follows:

1) pre-coating start-up procedure: (addition) GCC-60 → Low speed stirring for 1 minute → high speed stirring → antifoaming agent → dispersant, clear water → thickener → coating starch → CBC starch → high speed Low speed rotation → blue dye → purple dye → Water repellent → Lubricant → caustic soda → latex → stop the stirrer, end of the procedure! (samples were taken to test coating solids, viscosity, pH, temperature);

2) the start program of the intermediate coating: (addition) GCC-65 → low speed stirring for 1 minute → high speed stirring → foam inhibitor → 1# china clay → dispersant, clear water → thickener → coating starch → CBC starch → high speed low speed stirring for blue dye → purple dye → water repellent → lubricant → caustic soda → latex → stop the stirrer, end of the procedure! (samples were taken to test coating solids, viscosity, pH, temperature);

3) the surface coating paint starting program comprises the following steps: (addition) GCC-95 → low speed stirring for 1 minute → high speed stirring → foam inhibitor → 1# china clay → dispersant, clear water → high speed low speed → water repellent → lubricant → caustic soda → latex → VAE latex → rheological agent → selection procedure [ 1 ] stop the stirrer, sample for testing paint solid content, viscosity, PH value, temperature. And → the addition amount of the supplemented blue and purple dyes is adjusted according to the ab value of the finished paper → the stirrer is started to stir at low speed → the blue dye → the purple dye → the stirring and the dispersion are carried out for 5min, and then the program operation is stopped. Selecting a program [ 2 ] -. And → the addition amount of the replenished blue and purple dyes is adjusted according to the ab value of the finished paper → the stirrer is started to stir at low speed → the blue dyes → the purple dyes → the program operation is stopped after stirring and dispersing for 5 min.

Wherein GCC-60 is calcium carbonate grade 60, GCC-65 is calcium carbonate grade 65, GCC-95 is calcium carbonate grade 95, VAE latex is acetic acid latex, and CBC starch is modified starch.

In step 2, the flow of the coating machine and the coater is as follows:

1) pre-coating and coating machine-arranging flow: coating preparation → sampling detection → coating storage tank → vibrating screen → feed tank → pressure screen → coating feeding tray → scraper coating → reflux coarse screen → feed tank → continuous cyclic feeding in normal production

2) The process of the floating coat coating machine comprises the following steps: coating preparation → sampling detection → coating storage tank → vibrating screen → feed tank → pressure screen → coating feeding tray → scraper coating → reflux coarse screen → feed tank → continuous cyclic feeding in normal production

3) The top coating and coating process comprises the following steps: coating preparation → sampling detection → coating storage tank → vibrating screen → feed tank → pressure screen → coating feeding tray → scraper coating → reflux vibrating screen → feed tank → continuous circulation of feeding when production is normal.

The paper surface color line-changing-free normal production conversion process has the beneficial effects that: by changing the technical process of the production process, the conversion of production lines can be completed without changing the lines in actual production, thereby being beneficial to improving the production efficiency and saving the production cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.