A method for producing corrugated paper by adding waste pulp

Abstract

The invention relates to the technical field of corrugated base paper production, and specifically discloses a method for producing corrugated base paper by adding spent grains pulp. The method comprises the following steps: beating prepared liquor spent grains pulp, balancing the water content, measuring the water content and setting aside the prepared grains; soaking, debonding and beating waste paper to measure the water content and setting aside the prepared grains; preparing cationic starch, polyamide polyamine epichlorohydrin resin and the like and setting aside the prepared grains; and preparing the corrugated base paper by mixing liquor spent grains pulp and waste paper pulp. The liquor spent grains pulp is used to replace waste paper pulp to produce corrugated base paper, thereby reducing the existing raw material cost, making full use of waste resources and solving the problem of raw material shortage. Cationic starch is added as a dry strength agent, polyamide polyamine epichlorohydrin resin is added as a wet strength agent, and styrene acrylic emulsion is used for surface sizing. The produced corrugated base paper reaches first-class quality and meets quality standards.

Description

Technical Field

[0001] The invention relates to the technical field of pulping and papermaking, in particular to a method for producing corrugated base paper by adding spent grains pulp. Background Art

[0002] The existing production of corrugated paper mostly uses waste paper pulp. Waste paper pulp is the main pulp produced and consumed in my country's pulp and papermaking. In particular, the main papermaking raw material for packaging paper such as corrugated paper is waste paper pulp. However, with the implementation of my country's comprehensive ban on the import of solid waste, the import of waste paper pulp is prohibited, and my country's papermaking enterprises have gradually increased the recycling of domestic waste paper pulp. In recent years, my country's corrugated paper has almost no exports and is almost all used domestically. my country's consumption of corrugated paper is still in short supply, resulting in an increase in the import of corrugated paper year by year. In such a situation of insufficient raw materials and increasing consumption, the production of corrugated paper in my country's pulp and paper industry not only faces the improvement and adjustment of production processes and production equipment, but also needs to find new papermaking raw materials.

[0003] The amount of Chinese liquor lees is large and concentrated. If not handled in time, it will spoil, waste resources and pollute the environment. However, the lees have complex ingredients, high water content, are difficult to store, and contain fermentation fillers such as rice husks that are difficult to utilize. Therefore, the utilization of liquor lees is still difficult, but there is also considerable room for development.

[0004] Waste dregs are used as papermaking raw materials to produce corrugated paper and tube paper. Application tests show that the hardness, stiffness, and water resistance of the products are better than those produced from all waste paper. After testing, it has met the relevant national standards, and market promotion has also proved that its quality fully meets the requirements. Using waste dregs to produce corrugated paper and tube paper not only shortens the process and reduces costs, but also further improves product quality.

[0005] The production process of corrugated base paper in the prior art is often to produce corrugated base paper from fiber pulp and waste paper pulp. For example, in the regenerated high-strength corrugated base paper and its production method disclosed in the existing patent announcement number CN103321088B, the base paper is made of waste paper pulp and pulp residue pulp. Or in a preparation method of high-strength corrugated base paper disclosed in the existing patent announcement number CN110700005B, waste paper mixed pulp and damaged paper pulp are mixed to prepare corrugated base paper. There is no method for producing corrugated base paper by adding white wine waste pulp to waste paper.

[0006] In order to reduce environmental pollution, realize full utilization of resources, find a way to deal with waste lees resources and find a raw material for the pulp and paper industry that can replace waste paper to make corrugated base paper, and solve the problem of waste lees resource pollution and waste and the problem of lack of corrugated base paper making resources. The present invention provides a method for making corrugated base paper by adding white wine waste lees pulp. Summary of the invention

[0007] The object of the present invention is to provide a method for producing corrugated paper by adding waste pulp, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A method for producing corrugated paper by adding waste pulp comprises the following steps:

[0010] Step 1: After beating the prepared liquor lees slurry, balance the water content, measure the water content, and set aside;

[0011] Step 2: soaking, dispersing, beating and measuring the moisture content of the waste paper for later use;

[0012] Step 3, prepare cationic starch with a concentration of 1%-4% for later use;

[0013] Step 4, prepare a polyamide polyamine epichlorohydrin resin with a concentration of 0.5%-2% for standby use;

[0014] Step 5, preparing styrene-acrylic emulsions of different concentrations for standby use;

[0015] Step 6: After the waste slurry and waste paper pulp are weighed according to a certain ratio, the slurry is poured into a deflaking machine for deflaking;

[0016] Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper;

[0017] Step 8: Open the rapid paper sheet former to make paper sheets. After the rapid paper sheet former stops automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a felt, use a pressing roller to roll back and forth to remove part of the moisture, then take out the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two felts, and go to the press to press;

[0018] Step 9, open the press to press the wet paper sheets, felt and papermaking cloth;

[0019] Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, peel off the papermaking cloth on both sides, and place it in a sealed bag;

[0020] Step 11, the paper is surface sized with styrene acrylic emulsion at concentrations of 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, and 1% and dried to obtain corrugated base paper;

[0021] Step 12: subject the corrugated paper samples to constant temperature and humidity treatment, and measure the basis weight, tear length, ring crush index, water absorption, tightness and water absorption of the paper.

[0022] In an optional solution: the slurry in step 6 is poured into the deflaking cup of the deflaking machine, cationic starch is added, 1 / 3 to 1 / 2 of the volume of the deflaking cup is added with clean water, the deflaking speed is set to 10,000 rpm, and the deflaking machine is started until the deflaking is completed.

[0023] In an optional scheme: while the rapid paper sheet former is turned on in step eight, turn on the water source and the power of the vacuum pump, set the rapid paper sheet former to automatic, close the rapid paper sheet former papermaking barrel, start the rapid paper sheet former, wait for the water level to reach the first red line, pour the slurry in the debonding cup into the rapid paper sheet former, and then wait for the rapid paper sheet former to stop automatically.

[0024] In an optional scheme: the paper sample in step nine is placed together with the felt between the upper and lower pressing plates of the press, the press is started, and the formed paper sheet is pressed at a set pressure for a specified time. After the pressing is completed, the lower pressing plate of the press is lowered, and the felt and paper sample are taken out.

[0025] In an optional solution: place under constant temperature and humidity treatment conditions in step 12 for more than 4 hours.

[0026] In an optional solution, the ratio of the waste grains pulp to the waste paper pulp is 2:8.

[0027] In an optional solution: the beating degree of the spent grains pulp is 50°SR-90°SR, and the beating degree of the waste paper pulp is 50°SR-90°SR.

[0028] In an optional solution, the concentration of the styrene acrylic emulsion in step five is 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%.

[0029] In an optional embodiment, the cationic starch is a dry strength agent, and the polyamide polyamine epichlorohydrin resin is a wet strength agent.

[0030] In an optional solution: in the step eleven, the concentration of the styrene acrylic emulsion is 0.6%, 0.7%, 0.8%, 0.9%, or 1%.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The invention adopts liquor lees pulp and waste paper pulp to produce corrugated base paper. The liquor lees pulp is used to replace waste paper pulp to produce corrugated base paper, thereby reducing the existing raw material cost, making full use of waste resources, and solving the problem of raw material shortage. Cationic starch is added as a dry strength agent, polyamide polyamine epichlorohydrin resin is added as a wet strength agent, and styrene acrylic emulsion is used for surface sizing. The produced corrugated base paper reaches first-class quality and meets quality standards. DETAILED DESCRIPTION

[0033] Example 1

[0034] In this embodiment, a method for producing corrugated paper by adding waste pulp comprises the following steps:

[0035] Step 1: Prepare the liquor lees pulp, the liquor lees pulp has a beating degree of 87°SR, and after beating, balance the water content, measure the water content, and set aside;

[0036] Step 2: After soaking, debonding, beating and measuring the moisture content of the waste paper, the waste paper beating degree is 60°SR;

[0037] Step 3, prepare cationic starch with a concentration of 2% as a dry strength agent and set aside;

[0038] Step 4, prepare 1% polyamide polyamine epichlorohydrin resin as a wet strength agent for later use;

[0039] Step 5, prepare 1% styrene acrylic emulsion for standby use;

[0040] Step 6: weigh the waste slurry and waste paper pulp according to the ratio of 2:8, pour the slurry into the deflaking machine for deflaking, add cationic starch, add 1 / 3 to 1 / 2 of the volume of the deflaking cup with clean water, set the deflaking speed to 10,000 rpm, and start the deflaking machine until the deflaking is completed;

[0041] Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper;

[0042] Step 8, open the rapid paper sheet former to make paper sheets, turn on the water source and the power of the vacuum pump at the same time, set the rapid paper sheet former to automatic, close the rapid paper sheet former papermaking barrel, start the rapid paper sheet former, wait for the water level to reach the first red line, pour the slurry in the decomposition cup into the rapid paper sheet former, then wait for the rapid paper sheet former to stop automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a blanket, use a pressing roller to roll back and forth to remove part of the moisture, then remove the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two blankets, and go to the press to press;

[0043] Step 9, open the press, press the wet paper sheet, felt and papermaking cloth, put the paper sample and the felt between the upper and lower pressing plates of the press, start the press, press the formed paper sheet under the set pressure for a specified time, and after the pressing is completed, put down the lower pressing plate of the press, and take out the felt and paper sample;

[0044] Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, peel off the papermaking cloth on both sides, and place it in a sealed bag;

[0045] Step 11: sizing the surface of the paper after papermaking with a 1% styrene-acrylic emulsion, drying, and obtaining corrugated base paper;

[0046] Step 12: Place the corrugated paper sample under constant temperature and humidity conditions for more than 4 hours, and measure the basis weight, tear length, ring crush index, water absorption, tightness and water absorption of the paper.

[0047] In this embodiment, the quality indicators of the corrugated paper measured are: basis weight 100g / m2, tightness: 0.50g / cm3; ring crush index 5.7N·m / g; tear length: 3.85Km; water absorption: 97g / m2; moisture content: 8%.

[0048] Example 2

[0049] Different from Example 1, the method for producing corrugated paper by adding waste slurry comprises the following steps:

[0050] Step 1: Prepare the liquor lees pulp, the liquor lees pulp has a beating degree of 87°SR, and after beating, balance the water content, measure the water content, and set aside;

[0051] Step 2: After soaking, debonding, beating and measuring the moisture content of the waste paper, the waste paper beating degree is 60°SR;

[0052] Step 3, prepare cationic starch with a concentration of 2% as a dry strength agent and set aside;

[0053] Step 4, prepare 1% polyamide polyamine epichlorohydrin resin as a wet strength agent for later use;

[0054] Step 5, prepare 0.9% styrene acrylic emulsion for standby use;

[0055] Step 6: weigh the waste slurry and waste paper pulp according to the ratio of 2:8, pour the slurry into the deflaking machine for deflaking, add cationic starch, add 1 / 3 to 1 / 2 of the volume of the deflaking cup with clean water, set the deflaking speed to 10,000 rpm, and start the deflaking machine until the deflaking is completed;

[0056] Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper;

[0057] Step 8, open the rapid paper sheet former to make paper sheets, turn on the water source and the power of the vacuum pump at the same time, set the rapid paper sheet former to automatic, close the rapid paper sheet former papermaking barrel, start the rapid paper sheet former, wait for the water level to reach the first red line, pour the slurry in the decomposition cup into the rapid paper sheet former, then wait for the rapid paper sheet former to stop automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a blanket, use a pressing roller to roll back and forth to remove part of the moisture, then remove the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two blankets, and go to the press to press;

[0058] Step 9, open the press, press the wet paper sheet, felt and papermaking cloth, put the paper sample and the felt between the upper and lower pressing plates of the press, start the press, press the formed paper sheet under the set pressure for a specified time, and after the pressing is completed, put down the lower pressing plate of the press, and take out the felt and paper sample;

[0059] Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, peel off the papermaking cloth on both sides, and place it in a sealed bag;

[0060] Step 11: sizing the surface of the paper after papermaking with a styrene-acrylic emulsion having a concentration of 0.9%, and drying to obtain corrugated base paper;

[0061] Step 12: Place the corrugated paper sample under constant temperature and humidity conditions for more than 4 hours, and measure the basis weight, tear length, ring crush index, water absorption, tightness and water absorption of the paper.

[0062] In this embodiment, the quality indicators of the corrugated paper measured are: basis weight 100g / m2, compactness: 0.48g / cm3; ring crush index 5.7N·m / g; tear length: 3.69km; water absorption: 101g / m2; moisture content: 8%.

[0063] Example 3

[0064] Different from Example 1, the method for producing corrugated paper by adding waste slurry comprises the following steps:

[0065] Step 1: Prepare the liquor lees pulp, the liquor lees pulp has a beating degree of 87°SR, and after beating, balance the water content, measure the water content, and set aside;

[0066] Step 2: After soaking, debonding, beating and measuring the moisture content of the waste paper, the waste paper beating degree is 60°SR;

[0067] Step 3, prepare cationic starch with a concentration of 2% as a dry strength agent and set aside;

[0068] Step 4, prepare 1% polyamide polyamine epichlorohydrin resin as a wet strength agent for later use;

[0069] Step 5, prepare 0.8% styrene acrylic emulsion for standby use;

[0070] Step 6: weigh the waste slurry and waste paper pulp according to the ratio of 2:8, pour the slurry into the deflaking machine for deflaking, add cationic starch, add 1 / 3 to 1 / 2 of the volume of the deflaking cup with clean water, set the deflaking speed to 10,000 rpm, and start the deflaking machine until the deflaking is completed;

[0071] Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper;

[0072] Step 8, open the rapid paper sheet former to make paper sheets, turn on the water source and the power of the vacuum pump at the same time, set the rapid paper sheet former to automatic, close the rapid paper sheet former papermaking barrel, start the rapid paper sheet former, wait for the water level to reach the first red line, pour the slurry in the decomposition cup into the rapid paper sheet former, then wait for the rapid paper sheet former to stop automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a blanket, use a pressing roller to roll back and forth to remove part of the moisture, then remove the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two blankets, and go to the press to press;

[0073] Step 9, open the press, press the wet paper sheet, felt and papermaking cloth, put the paper sample and the felt between the upper and lower pressing plates of the press, start the press, press the formed paper sheet under the set pressure for a specified time, and after the pressing is completed, put down the lower pressing plate of the press, and take out the felt and paper sample;

[0074] Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, peel off the papermaking cloth on both sides, and place it in a sealed bag;

[0075] Step 11: sizing the surface of the paper after papermaking with a styrene-acrylic emulsion having a concentration of 0.8%, and drying to obtain corrugated base paper;

[0076] Step 12: Place the corrugated paper sample under constant temperature and humidity conditions for more than 4 hours, and measure the basis weight, tear length, ring crush index, water absorption, tightness and water absorption of the paper.

[0077] In this embodiment, the quality indicators of the corrugated paper measured are: basis weight 100g / m2, compactness: 0.48g / cm3; ring crush index 6.0N·m / g; tear length: 3.60km; water absorption: 105g / m2; moisture content: 8%.

[0078] Example 4

[0079] Different from Example 1, the method for producing corrugated paper by adding waste slurry comprises the following steps:

[0080] Step 1: Prepare the liquor lees pulp, the liquor lees pulp has a beating degree of 87°SR, and after beating, balance the water content, measure the water content, and set aside;

[0081] Step 2: After soaking, debonding, beating and measuring the moisture content of the waste paper, the waste paper beating degree is 60°SR;

[0082] Step 3, prepare cationic starch with a concentration of 2% as a dry strength agent and set aside;

[0083] Step 4, prepare 1% polyamide polyamine epichlorohydrin resin as a wet strength agent for later use;

[0084] Step 5, prepare 0.7% styrene acrylic emulsion for standby use;

[0085] Step 6: Weigh the waste slurry and waste paper pulp in a ratio of 2:8, pour the slurry into the deflaking machine for deflaking, add cationic starch, add 1 / 3 to 1 / 2 of the volume of the deflaking cup with clean water, set the deflaking speed to 10,000 rpm, and start the deflaking machine until the deflaking is completed;

[0086] Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper;

[0087] Step 8, open the rapid paper sheet former to make paper sheets, turn on the water source and the power of the vacuum pump at the same time, set the rapid paper sheet former to automatic, close the rapid paper sheet former papermaking barrel, start the rapid paper sheet former, wait for the water level to reach the first red line, pour the slurry in the decomposition cup into the rapid paper sheet former, then wait for the rapid paper sheet former to stop automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a blanket, use a pressing roller to roll back and forth to remove part of the moisture, then remove the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two blankets, and go to the press to press;

[0088] Step 9, open the press, press the wet paper sheet, felt and papermaking cloth, put the paper sample and the felt between the upper and lower pressing plates of the press, start the press, press the formed paper sheet under the set pressure for a specified time, and after the pressing is completed, put down the lower pressing plate of the press, and take out the felt and paper sample;

[0089] Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, peel off the papermaking cloth on both sides, and place it in a sealed bag;

[0090] Step 11: sizing the surface of the paper after papermaking with a styrene-acrylic emulsion having a concentration of 0.7%, and drying to obtain corrugated base paper;

[0091] Step 12: Place the corrugated paper sample under constant temperature and humidity conditions for more than 4 hours, and measure the basis weight, tear length, ring crush index, water absorption, tightness and water absorption of the paper.

[0092] In this embodiment, the quality indicators of the corrugated paper measured are: basis weight 100g / m2, compactness: 0.47g / cm3; ring crush index 6.5N·m / g; tear length: 3.54km; water absorption: 110g / m2; moisture content: 8%.

[0093] Example 5

[0094] Different from Example 1, the method for producing corrugated paper by adding waste slurry comprises the following steps:

[0095] Step 1: Prepare the liquor lees pulp, the liquor lees pulp has a beating degree of 87°SR, and after beating, balance the water content, measure the water content, and set aside;

[0096] Step 2: After soaking, debonding, beating and measuring the moisture content of the waste paper, the waste paper beating degree is 60°SR;

[0097] Step 3, prepare cationic starch with a concentration of 2% as a dry strength agent and set aside;

[0098] Step 4, prepare 1% polyamide polyamine epichlorohydrin resin as a wet strength agent for later use;

[0099] Step 5, prepare 0.6% styrene acrylic emulsion for standby use;

[0100] Step 6: weigh the waste slurry and waste paper pulp according to the ratio of 2:8, pour the slurry into the deflaking machine for deflaking, add cationic starch, add 1 / 3 to 1 / 2 of the volume of the deflaking cup with clean water, set the deflaking speed to 10,000 rpm, and start the deflaking machine until the deflaking is completed;

[0101] Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper;

[0102] Step 8, open the rapid paper sheet former to make paper sheets, turn on the water source and the power of the vacuum pump at the same time, set the rapid paper sheet former to automatic, close the rapid paper sheet former papermaking barrel, start the rapid paper sheet former, wait for the water level to reach the first red line, pour the slurry in the decomposition cup into the rapid paper sheet former, then wait for the rapid paper sheet former to stop automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a blanket, use a pressing roller to roll back and forth to remove part of the moisture, then remove the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two blankets, and go to the press to press;

[0103] Step 9, open the press, press the wet paper sheet, felt and papermaking cloth, put the paper sample and the felt between the upper and lower pressing plates of the press, start the press, press the formed paper sheet under the set pressure for a specified time, and after the pressing is completed, put down the lower pressing plate of the press, and take out the felt and paper sample;

[0104] Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, peel off the papermaking cloth on both sides, and place it in a sealed bag;

[0105] Step 11: sizing the surface of the paper after papermaking with a styrene-acrylic emulsion having a concentration of 0.6%, and drying to obtain corrugated base paper;

[0106] Step 12: Place the corrugated paper sample under constant temperature and humidity conditions for more than 4 hours, and measure the basis weight, tear length, ring crush index, water absorption, tightness and water absorption of the paper.

[0107] In this embodiment, the quality indicators of the corrugated paper measured are: basis weight 100g / m2, compactness: 0.46g / cm3; ring crush index 6.9N·m / g; tear length: 3.33km; water absorption: 127g / m2; moisture content: 8%.

[0108] The invention adopts a mixture of liquor lees pulp and waste paper pulp to produce corrugated base paper. The liquor lees pulp is used to replace waste paper pulp to produce corrugated base paper, thereby reducing the existing raw material cost, making full use of waste resources, and solving the problem of raw material shortage. Cationic starch is added as a dry strength agent, polyamide polyamine epichlorohydrin resin is added as a wet strength agent, and styrene acrylic emulsion is used for surface sizing. The produced corrugated base paper reaches first-class quality and meets quality standards.

Claims

1. A method for producing corrugated paper by adding waste pulp, characterized in that: The following steps are involved: Step 1: After beating the prepared liquor lees slurry, balance the water content, measure the water content, and set aside; Step 2: soaking, dispersing, beating and measuring the moisture content of the waste paper for later use; Step 3, prepare cationic starch with a concentration of 1%-4% for standby use; Step 4, prepare 0.5%-2% concentration of polyamide polyamine epichlorohydrin resin for standby use; Step 5, prepare styrene acrylic emulsion with a concentration of 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1% for standby use; Step 6: After the waste slurry and waste paper pulp are weighed according to a certain ratio, the slurry is poured into a deflaking machine for deflaking; Step 7: After decomposition, pour the decomposition slurry into a plastic cup or beaker, then add 1% polyamide polyamine epichlorohydrin resin while stirring, let it stand for 1 minute, and then make paper; Step 8: Open the rapid paper sheet former to make paper sheets. After the rapid paper sheet former stops automatically, open the papermaking barrel, cover the formed paper with a papermaking cloth and a felt, use a pressing roller to roll back and forth to remove some moisture, then take out the wet paper sheet together with the papermaking cloth, cover the other side of the wet paper sheet with a papermaking cloth, then put the wet paper sheet between the two felts, and go to the press to press; Step 9: Open the press to press the wet paper sheets, felt and papermaking cloth; Step 10: Place the formed paper sample wrapped with papermaking cloth on a rapid paper sheet dryer for drying. After the paper sheet is dried, take out the paper sample, uncover the papermaking cloth on both sides, and place it in a sealed bag; Step 11, applying sizing to the surface of the paper after papermaking, using a styrene acrylic emulsion with a concentration of 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1% to apply sizing to the surface, and drying to obtain corrugated base paper; Step 12: subject the corrugated paper sample to constant temperature and humidity treatment, and measure the basis weight, tear length, ring pressure index, water absorption, tightness and water absorption of the paper; The ratio of the waste slurry to the waste paper pulp is 2:8; The beating degree of the spent grains pulp is 50°SR-90°SR, and the beating degree of the waste paper pulp is 40°SR-80°SR.

2. The method for producing corrugated paper by adding waste slurry according to claim 1, characterized in that: In step 6, the slurry is poured into the deflaking cup of the deflaking machine, cationic starch is added, clean water of 1 / 3 to 1 / 2 of the volume of the deflaking cup is added, the deflaking speed is set to 10,000 rpm, and the deflaking machine is started until the deflaking is completed.

3. The method for producing corrugated paper by adding waste slurry according to claim 1, characterized in that: In the step eight, while the rapid paper sheet former is turned on, the water source and the power supply of the vacuum pump are turned on, the rapid paper sheet former is set to automatic, the papermaking barrel of the rapid paper sheet former is closed, the rapid paper sheet former is started, and when the water level reaches the first red line, the slurry in the degassing cup is poured into the rapid paper sheet former, and then the rapid paper sheet former is waited for to stop automatically.

4. The method for producing corrugated paper by adding waste slurry according to claim 1, characterized in that: In step nine, the paper sample and the felt are placed between the upper and lower pressing plates of the press, the press is started, and the formed paper sheet is pressed for a specified time under a set pressure. After the pressing is completed, the lower pressing plate of the press is lowered, and the felt and paper sample are taken out.

5. The method for producing corrugated paper by adding waste slurry according to claim 1, characterized in that: In step 12, the mixture is placed under constant temperature and humidity conditions for more than 4 hours.

6. The method for producing corrugated paper by adding waste slurry according to claim 1, characterized in that: The cationic starch is a dry strength agent, and the polyamide polyamine epichlorohydrin resin is a wet strength agent.