CN115976874B - Four-layer ash-coated white board paper and five-layer ash-coated white board paper online mutual transfer production method - Google Patents
Four-layer ash-coated white board paper and five-layer ash-coated white board paper online mutual transfer production method Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims description 54
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000003213 activating effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 139
- 239000000123 paper Substances 0.000 description 89
- 239000012792 core layer Substances 0.000 description 14
- 238000011010 flushing procedure Methods 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 6
- 238000004537 pulping Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
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Abstract
The invention provides a method for online transferring and producing five-layer gray-base coated white board paper by four layers of gray-base coated white board paper, which comprises the following steps: (1) Feeding liquid into a bottom lining slurry forming pond and a bottom lining white water pond to a normal liquid level; (2) Controlling the opening degree of the vacuum valve in the bottom lining layer net part to be 50% larger than that of normal operation; (3) Controlling the power of the pulp pump to be 10-23% of the maximum power; (4) activating the backing layer web portion; (5) Controlling the power of the pulp pump to be 60-80% of the maximum power; (6) Controlling the moisture content of the four layers of ash-bottom coated white board paper to be 6.5% -9.5%; (7) The vacuum degree in the bottom lining layer net part is controlled to be 2-30kpa, and the running speed of the bottom lining layer net part is controlled to be more than 350m/s. The method can be used for on-line conversion of four layers of grey base coated white board paper into five layers of grey base coated white board paper without stopping the machine, thereby increasing the effective operation rate of the paper machine, reducing the energy consumption and the manufacturing cost and improving the production efficiency. The invention also provides a method for online transferring the five-layer gray-base coated white board paper into the four-layer gray-base coated white board paper.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for online transfer production of five layers of ash-coated white board paper by four layers of ash-coated white board paper.
Background
Grey coated white board paper is a relatively important paper product, especially for packaging paper. The quantitative span of the ash-coated white board is 230 g-450 g, and the span is larger, wherein the weight of 230 g-300 g is called low-gram-weight ash-coated white board, and the weight of 350 g-450 g is called high-gram-weight ash-coated white board. The ash base coated white board paper can be divided into four layers according to the structure, and comprises a surface layer, a surface lining layer, a core layer and a bottom layer from top to bottom in sequence; sometimes it is also divided into five layers, from top to bottom, a face layer, a face liner, a core layer, a bottom liner and a bottom layer. The structural division is mainly related to the production mode of the ash base coated white board paper, the ash base coated white board paper can be produced by adopting an ash base coated white board paper machine, and when the high-gram-weight ash base coated white board paper is produced, the core layer is divided into the core layer and the bottom lining layer for preparation respectively in order to improve the drying speed and the rapid dehydration forming of the core layer due to the large slurry coating amount of the core layer, and the slurry of the core layer and the bottom lining layer is the same, so that the paper product prepared by adopting the process is the five-layer ash base coated white board paper; when the low-gram-weight gray-bottom coated white board paper is produced, the core layer is small in slurry hanging amount, layering preparation is not needed, quick drying and quick dehydration forming of the core layer can be realized, if the core layer is divided into the core layer and the bottom lining layer to be respectively prepared, related production equipment of the bottom lining layer needs to be started, the energy consumption is larger, the cost is also larger, and the actual effect is not greatly increased. Thus, there is no need to prepare the paper product by layering, and the paper product prepared by the process is the four-layer gray-base coated white board paper.
Referring to fig. 1, a schematic diagram of a current ash-backed coated whiteboard paper machine is shown, comprising a facer system 10, a facer system 30, a core system 50, a backing layer system 70, and a backing layer system 90. Wherein the facing system 10, the facing system 30, the core system 50, the base layer system 70 and the base layer system 90 each comprise a respective slurry supply system, a respective flow system and a respective wire section system, which are described in detail in connection with the disclosure of chinese patent CN 109082945A. Specifically, the prepared surface layer, surface lining layer, core layer, bottom lining layer and bottom sizing agent are respectively diluted by respective pulp flushing pumps and then are sent to each layer of pulp box to be net-fed and manufactured; the sizing agent is sprayed to each layer of net part for dehydration through the outlet of the lip plate of the head box, and then is formed into a wet paper sheet by compounding in a bottom net, dehydrated in a squeezing part, evaporated in a front drying part, sized by a surface sizing machine, evaporated in a rear drying part and finished by a soft roll calender, and then is reeled into a paper roll with certain specification by a reeler and a rewinder. Referring to fig. 2, a bottom lining system is taken as an example, and includes a bottom lining slurry preparing tank 71, a bottom lining slurry forming tank 72, a bottom lining sizing pump 73, a bottom lining flushing pump 74, a bottom lining pressure screen 75, a bottom lining slurry box 76, a bottom lining net portion 77 and a bottom lining white water tank 78, wherein the bottom lining sizing pump 73 sends slurry into the bottom lining flushing pump 74, and the bottom lining flushing pump 74 mixes white water of the slurry and the bottom lining white water tank 78 and then enters the bottom lining slurry box 76 and the bottom lining net portion 77 through the bottom lining pressure screen 75.
At present, when the existing ash base coated white board paper machine is adopted to carry out the mutual transfer production of four layers of ash base coated white board paper and five layers of ash base coated white board paper, the paper machine is stopped, for example, when the four layers of ash base coated white board paper are transferred to produce five layers of ash base coated white board paper, the paper machine is stopped firstly, and then the surface layer system 10, the surface layer system 30, the core layer system 50, the bottom layer system 70 and the bottom layer system 90 are started simultaneously so as to realize synchronous movement, and normal production of five layers of ash base coated white board paper is carried out, otherwise, the produced paper products are disqualified; for example, when converting five-layer gray-base coated white board paper into four-layer gray-base coated white board paper, the paper machine needs to be stopped, and then the surface layer system 10, the surface layer system 30, the core layer system 50 and the bottom layer system 90 are started simultaneously to realize synchronous motion, so that normal production of the four-layer gray-base coated white board paper is performed, and otherwise, the produced paper product is unqualified. However, the shutdown time of the paper machine is more in the process, the operation efficiency of the paper machine is affected, and the operation cost and the production efficiency of the paper machine are increased.
Disclosure of Invention
In order to solve the technical defects, the invention aims to provide a method for online transfer production of five-layer gray-base coated white board paper by using four-layer gray-base coated white board paper and a method for online transfer production of four-layer gray-base coated white board by using five-layer gray-base coated white board paper, so that online transfer production of four-layer gray-base coated white board paper and five-layer gray-base coated white board paper can be realized without stopping the machine, the effective operation rate of a paper machine is increased, the energy consumption and the manufacturing cost are reduced, and the production efficiency is improved.
In order to achieve the above purpose, in one aspect, the invention provides a method for producing five-layer ash-coated white board paper by online transfer of four-layer ash-coated white board paper,
The production of four layers of grey base coated white board paper is changed into the production of five layers of grey base coated white board paper, and the method comprises the following steps:
(1) Feeding liquid into a bottom lining slurry forming pond and a bottom lining white water pond to a normal liquid level;
(2) The bottom lining layer net part is in a stop state, and the opening degree of the vacuum valve in the bottom lining layer net part is controlled to be 50% larger than that of normal operation;
(3) Test water: controlling the power of the pulp pump to be 10-23% of the maximum power;
(4) Starting the bottom lining layer net part, controlling the running speed to be 40-50m/s,
(5) Controlling the power of the pulp pump to be 60-80% of the maximum power of the pulp pump, wherein the pulp pump is in an automatic combined control state, and the sizing pump starts sizing;
(6) Controlling the moisture content of the four layers of ash-bottom coated white board paper to be between 6.5 and 9.5 percent;
(7) The vacuum degree in the bottom lining layer net part is controlled to be 2-30kpa, and the running speed of the bottom lining layer net part is controlled to be more than 350m/s.
In some embodiments, the bottom liner web is dewatered using a low vacuum box, a medium vacuum box, and a high vacuum box,
In the step (7), the vacuum degree of the low vacuum box of the bottom lining layer net part is controlled to be 2-5kpa; controlling the vacuum degree of the middle vacuum box of the bottom lining layer net part to be 8-12kpa; the high vacuum box vacuum of the backing layer web was controlled to 15-30kpa.
In some embodiments, in the step (5), the sizing amount of the sizing pump is controlled to be less than or equal to 500 l/min, which may be, for example, but not limited to, 300 l/min, 350 l/min, 400 l/min, 450 l/min, or 500 l/min.
In some embodiments, in step (7), the sizing amount of the sizing pump is controlled to be at least 2500 l/min, and as an example, the sizing amount may be, but not limited to, 2500 l/min, 3000 l/min, 2500 l/min, 4000 l/min, 4500 l/min, etc., and in actual production, the sizing amount and the running speed of the bottom liner layer mesh portion are set according to the required sizing amount and the running speed of the bottom liner layer mesh portion, which are not described herein.
In some embodiments, the grammage of the four-ply gray base coated white board is 230-300 grams, also referred to as low grammage, and by way of example, the grammage of the four-ply gray base coated white board may be, but is not limited to, 230 grams, 240 grams, 250 grams, 260 grams, 270 grams, 280 grams, 290 grams, 300 grams.
In some embodiments, the five-layer gray-primed whiteboard paper has a grammage of 350-450 grams, also referred to as high grammage, and as an example, the five-layer gray-primed whiteboard paper may have a grammage of, but is not limited to, 350 grams, 360 grams, 370 grams, 380 grams, 390 grams, 400 grams, 410 grams, 420 grams, 430 grams, 440 grams, 450 grams.
On the other hand, the invention also provides a method for producing four layers of ash-coated white board on line by converting the production of five layers of ash-coated white board into the production of four layers of ash-coated white board, which comprises the following steps:
(1) Controlling the opening degree of the vacuum valve in the bottom lining layer net part to be 50% larger than that of normal operation;
(2) The moisture content of the five-layer gray-base coated white board paper is controlled to be not more than 9.5%;
(3) The sizing amount of the sizing pump is controlled to gradually decrease until the sizing amount is less than 500L/min, the sizing pump is stopped,
(4) Stopping the slurry pump after confirming that the bottom lining layer net part is free of slurry;
(5) Stopping the backing layer web.
The invention has the beneficial effects that:
In the method for online mutual transfer production of the four-layer gray-base coated white board paper and the five-layer gray-base coated white board paper, the four-layer gray-base coated white board paper is changed into the five-layer gray-base coated white board paper, or the five-layer gray-base coated white board paper is changed into the four-layer gray-base coated white board paper, the whole paper machine is not required to stop working, when the bottom lining layer net part is started or stopped, the processes are adjusted, the mutual transfer production of the two paper machines can be realized online, and the quality of the paper products after the connection is qualified.
Drawings
Fig. 1 is a schematic diagram of a prior art ash-primed whiteboard paper machine.
Fig. 2 is a partial process flow diagram of a prior art process for preparing a primer layer.
Detailed Description
In order to describe the technical content and constructional features of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The invention provides a four-layer gray-base coated white board paper and a five-layer gray-base coated white board paper online mutual transfer production method,
In one aspect, a method for on-line conversion of four-layer gray-coated white board paper to five-layer gray-coated white board paper, converting the production of four-layer gray-coated white board paper to five-layer gray-coated white board paper, comprises the steps of:
(1) Feeding liquid into a bottom lining slurry forming pond and a bottom lining white water pond to a normal liquid level;
It can be understood that before the bottom lining pulping pool and the bottom lining white water pool are filled, checking whether the bottom lining pulping pool and the bottom lining white water pool are cleaned or not and whether the blow-off valve is closed or not, if not, cleaning with clear water is adopted firstly, after cleaning is confirmed and after the blow-off valve is closed, feeding the running liquid again, so that the influence of impurities on the product quality is avoided. It should also be noted that the normal level is a predetermined level height of the bottom layer pulping tank and the bottom layer white water tank, which is predetermined according to the production.
(2) The bottom lining layer net part is in a stop state, and the opening degree of the vacuum valve in the bottom lining layer net part is controlled to be 50% or more greater than that of normal operation;
It can be understood that the bottom lining layer mesh part is not covered with the slurry layer at this time, and the vacuum leakage condition occurs, and the valve opening is increased to be 50% greater than that in normal operation, so as to ensure that enough vacuum can be formed when the slurry arrives at the bottom lining layer mesh part, and avoid the influence of the vacuum leakage of the bottom lining layer mesh part on production. By way of example, a vacuum valve is opened by an opening of 1/3 during normal production, where the valve should be opened by an opening of 2/3.
(3) Test water: controlling the power of the pulp pump to be 10-23% of the maximum power;
It can be understood that by controlling the power of the flushing pump to be 10-23% of the maximum power, a small amount of water flows out of the lip of the headbox is observed, if water flows out, the residual rotten slurry in the headbox is judged, and if the power of the flushing pump is greatly improved, a large amount of water can be suddenly sprayed to cause overflow of white water at the bottom lining layer net part, so that abnormal sizing is caused. It should be noted that if the headbox effluent white water fiber content is high, it is desirable to stop the feed, empty the white water tank, and add fresh water again to repeatedly clean the system until the headbox lip has no water flowing out. As an example, but not limited to, the fan pump power is controlled to be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23% of its maximum power.
(4) Starting the bottom lining layer net part, and controlling the running speed to be 40-50m/s;
It can be appreciated that by controlling the speed of the bottom layer web portion to run low, it is convenient to confirm whether the web is off tracking, specifically, the running speed is controlled to be 40-50m/s; by way of example, the operating speed may be, but is not limited to, 40m/s, 41m/s, 42m/s, 43m/s, 44m/s, 45m/s, 46m/s, 47m/s, 48m/s, 49m/s, 50m/s.
(5) Controlling the power of the pulp pump to be 60-80% of the maximum power of the pulp pump, wherein the pulp pump is in an automatic combined control state, and the sizing pump starts sizing;
It will be appreciated that the power of the fan pump is increased stepwise to normal, such as by controlling its power to 60-80% of its maximum power, and by way of example, to 60%, 65%, 70%, 75%, 80% of its maximum power. It should be noted that the power of the pump has three control states, the first is to manually control the given power, i.e. the power of the motor of the pump is manually operated by an operator; the second is an automatic state, and after the power value of the pulp pump is set by an operator, the pulp pump is automatically adjusted according to the set power value; and thirdly, an automatic combined control state is that after the detection of the head pressure detection equipment of the head box, the power of the pulp flushing pump is calculated and controlled according to a program to adjust to reach the set value of the head pressure of the head box. Therefore, when the pulp pump is in an automatic combined control state, the sizing pump starts to perform sizing, mainly the sizing pump conveys the pulp of the pulp forming pond to the pulp pump, and meanwhile white water in the white water pond also enters the pulp pump.
In a preferred embodiment, the sizing amount of the sizing pump is controlled to be less than or equal to 500L/min, so that paper breakage and too large tension fluctuation caused by excessive sizing are prevented, and the paper web is prevented from being deviated. As an example, the sizing amount of the sizing pump is controlled to be, but not limited to, 300 l/min, 350 l/min, 400 l/min, 450 l/min, 500 l/min. When normal production is performed, the sizing amount of the sizing pump is gradually increased, the sizing amount of the sizing pump is controlled to be at least 2500L/min, and as an example, the sizing amount can be, but is not limited to, 2500L/min, 3000L/min, 2500L/min, 4000L/min, 4500L/min, etc., and in actual production, the sizing amount and the running speed of the bottom lining layer net part are set according to the required sizing amount and the running speed of the bottom lining layer net part, and are not described herein.
(6) Controlling the moisture content of the four layers of ash-bottom coated white board paper to be between 6.5 and 9.5 percent;
It can be understood that when the sizing operation of the five-layer ash-coated white board is carried out, the moisture content of the four-layer ash-coated white board produced in the prior art needs to be controlled to be between 6.5 and 9.5 percent, so that paper breakage and too large tension fluctuation caused by sudden rising of moisture in the moment of sizing are prevented, and the paper web is deviated. When five layers of grey base coated white board paper are normally produced, the moisture content of the five layers of grey base coated white board paper is controlled to be 7.5-8.5%.
(7) The vacuum degree in the bottom lining layer net part is controlled to be 2-30kpa, and the running speed of the bottom lining layer net part is controlled to be more than 350m/s.
It will be appreciated that when the normal production of five-ply gray base coated paperboard is gradually resumed, the vacuum in the base layer web should be controlled to a normal level, such as a vacuum in the base layer web of 2-30kpa. In a preferred embodiment, the bottom liner web is dewatered using a low vacuum box, a medium vacuum box and a high vacuum box, i.e., three stage vacuum dewatering, to increase dewatering efficiency. Specifically, in the step (2), the opening degree of a vacuum valve of each vacuum box is opened by 50% more than that of normal production, and when normal production is carried out, the vacuum degree of the low vacuum box of the bottom lining layer net part is controlled to be 2-5kpa; controlling the vacuum degree of the middle vacuum box of the bottom lining layer net part to be 8-12kpa; the high vacuum box vacuum of the backing layer web was controlled to 15-30kpa. In this embodiment, the running speed of the base layer web portion is controlled to be greater than 350m/s to accommodate higher productivity, and the specific running speed can be set according to actual production requirements.
In another aspect, a method for on-line conversion of five-layer gray-base coated white board to four-layer gray-base coated white board, converting the production of five-layer gray-base coated white board to the production of four-layer gray-base coated white board, comprises the steps of:
(1) Controlling the opening degree of the vacuum valve in the bottom lining layer net part to be 50% larger than that of normal operation;
(2) The moisture content of the five-layer gray-base coated white board paper is controlled to be not more than 9.5%;
(3) The sizing amount of the sizing pump is controlled to gradually decrease until the sizing amount is less than 500L/min, the sizing pump is stopped,
(4) Stopping the slurry pump after confirming that the bottom lining layer net part is free of slurry;
(5) The backing layer web is stopped.
It should be understood that the conversion of five-layer gray-base coated white board paper to four-layer gray-base coated white board paper can be referred to as four-layer gray-base coated white board paper to five-layer gray-base coated white board paper.
The method of the present invention for the on-line conversion of four-layer ash-coated white board paper and five-layer ash-coated white board paper is further described below by way of specific examples, but is not limited thereto.
Example 1
Converting the production of four layers of grey base coated white board paper (with a gram weight of 250 g) to the production of five layers of grey base coated white board paper (with a gram weight of 350 g), comprising the steps of:
(1) The four layers of gray base coated white board paper are in a normal production state,
Firstly checking whether a bottom lining pulping pool and a bottom lining white water pool are cleaned, and whether a blow-off valve is closed or not, if not, cleaning with clear water, and after cleaning, and after the blow-off valve is closed, feeding liquid into the bottom lining pulping pool and the bottom lining white water pool to normal liquid level;
(2) The bottom lining layer net part is in a stop state, and the openings of the vacuum valves of the middle and low vacuum boxes, the middle and high vacuum boxes in the bottom lining layer net part are controlled to be 50% larger than the opening in normal operation;
(3) Test water: controlling the power of a pulp flushing pump to 22% of the maximum power, observing that a small amount of water flows out of the lip of the pulp flowing box, judging that residual slough exists in the pulp flowing box if water flows out, stopping feeding liquid if the content of white water fiber flowing out of the pulp flowing box is large, emptying a white water pool, and adding fresh water again to repeatedly clean the system until no water flows out of the lip of the pulp flowing box;
(4) Starting the bottom lining layer net part, and controlling the running speed to be 45m/s;
(5) Controlling the power of the pulp pump to be 80% of the maximum power of the pulp pump, gradually enabling the pulp pump to be in an automatic combined control state, starting the pulp feeding of the pulp feeding pump, and controlling the pulp feeding amount of the pulp feeding pump to be 500L/min;
(6) Controlling the moisture content of the four-layer gray-base coated white board paper to be 6.5%;
(7) Normally producing five layers of gray base coated white board paper, and controlling the vacuum degree of a low vacuum box at the net part of a bottom lining layer to be 3kpa; controlling the vacuum degree of the middle vacuum box of the bottom lining layer net part to be 9kpa; controlling the vacuum degree of the high vacuum box of the bottom lining layer net part to be 20kpa; the running speed of the bottom lining layer net part is controlled to be 800m/s, the moisture content of the five-layer gray bottom coating white board paper is controlled to be 7.5%, and the sizing amount of the sizing pump is controlled to be 3000L/min.
Example 2
Converting the production of five-layer gray coated white board paper (with a gram weight of 350 g) to the production of four-layer gray coated white board paper (with a gram weight of 250 g), comprising the steps of:
(1) Five layers of grey base coated white board paper are in a normal production state,
The opening degree of the vacuum valves of the middle and low vacuum boxes and the middle and high vacuum boxes in the bottom lining layer net part is controlled to be 50% larger than that in normal operation;
(2) Controlling the moisture content of the five-layer gray-base coated white board paper to be 7.5%;
(3) Controlling the sizing amount of the sizing pump to gradually decrease until the sizing amount is less than 500L/min, and stopping the sizing pump;
(4) Stopping the slurry pump after confirming that the bottom lining layer net part is free of slurry;
(5) The backing layer web is stopped.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (6)
1. The method for producing the five-layer gray-base coated white board paper by online transfer of the four-layer gray-base coated white board paper is characterized by comprising the following steps of:
(1) Feeding liquid into a bottom lining slurry forming pond and a bottom lining white water pond to a normal liquid level;
(2) The bottom lining layer net part is in a stop state, and the opening degree of a vacuum valve in the bottom lining layer net part is controlled to be 50% larger than that of normal operation;
(3) Test water: controlling the power of the pulp pump to be 10-23% of the maximum power;
(4) Starting the bottom lining layer net part, and controlling the running speed to be 40-50m/s;
(5) Controlling the power of the pulp pump to be 60-80% of the maximum power of the pulp pump, wherein the pulp pump is in an automatic combined control state, and the sizing pump starts sizing;
(6) Controlling the moisture content of the four layers of ash-bottom coated white board paper to be between 6.5 and 9.5 percent;
(7) And controlling the vacuum degree in the bottom lining layer net part to be 2-30kpa, controlling the running speed of the bottom lining layer net part to be more than 350m/s, and producing five layers of grey base coated white board paper.
2. The method for on-line transfer of five-layer ash-coated white board paper from four-layer ash-coated white board paper according to claim 1, wherein the bottom lining layer web portion is dewatered by a low vacuum box, a medium vacuum box and a high vacuum box,
In the step (7), the vacuum degree of the low vacuum box at the net part of the bottom lining layer is controlled to be 2-5kpa; controlling the vacuum degree of the vacuum box in the bottom lining layer net part to be 8-12kpa; the vacuum degree of the high vacuum box of the net part of the bottom lining layer is controlled to be 15-30kpa.
3. The method for on-line transfer of four-layer ash-coated white board paper to five-layer ash-coated white board paper according to claim 1, wherein in the step (5), the sizing amount of the sizing pump is controlled to be less than or equal to 500 l/min.
4. The method for on-line converting a four-ply ash-backed coated white board into a five-ply ash-backed coated white board according to claim 1, wherein in the step (7), the sizing amount of the sizing pump is controlled to be at least 2500 l/min.
5. The method for on-line conversion of four-ply ash-backed coated white board paper into five-ply ash-backed coated white board paper according to claim 1, wherein the grammage of the four-ply ash-backed coated white board paper is 230-300 grams.
6. The method for on-line conversion of four-ply ash-backed coated white board paper into five-ply ash-backed coated white board paper according to claim 1, wherein the five-ply ash-backed coated white board paper has a grammage of 350-450 grams.
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| CN202211530023.4A CN115976874B (en) | 2022-11-30 | 2022-11-30 | Four-layer ash-coated white board paper and five-layer ash-coated white board paper online mutual transfer production method |
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| CN111270558A (en) * | 2020-02-28 | 2020-06-12 | 东莞建晖纸业有限公司 | Normal production conversion process without changing paper surface color |
| CN111424460A (en) * | 2020-03-25 | 2020-07-17 | 山鹰国际控股股份公司 | Method for manufacturing regenerated two-layer cardboard paper by running three-layer net-folding paper machine |
| CN214423006U (en) * | 2020-11-30 | 2021-10-19 | 上海东冠纸业有限公司 | Paper machine starching system |
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| CN109082945A (en) * | 2018-07-04 | 2018-12-25 | 东莞建晖纸业有限公司 | A kind of preparation process being coated with coated duplex board with grey back |
| CN111270558A (en) * | 2020-02-28 | 2020-06-12 | 东莞建晖纸业有限公司 | Normal production conversion process without changing paper surface color |
| CN111424460A (en) * | 2020-03-25 | 2020-07-17 | 山鹰国际控股股份公司 | Method for manufacturing regenerated two-layer cardboard paper by running three-layer net-folding paper machine |
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