Production process of low-basis-weight dyed corrugating base paper

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a production process of low-basis-weight dyed corrugating base paper. The production process of the low-basis-weight dyed corrugating base paper comprises the following steps: (1) pulping waste paper through a hydrapulper, removing slag through a slag remover, and discharging through a discharging tower; (2) coarsely screening impurities, and removing sand by using a low-concentration slag separator; (3) fine screening, multi-disc concentration and feeding into a pulping tower; (4) entering a streaming system, feeding on a net, squeezing and then entering a pre-drying part; and (5) sizing by a sizing machine, entering a post-drying part, and curling to obtain the low-basis-weight dyed corrugating base paper. The production process of the low-basis-weight dyed corrugating base paper, provided by the invention, is low in investment cost and low in maintenance cost, and the fiber loss rate is reduced while the cleanliness of the pulp is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking, and in particular relates to a production process for low-quantity dyed corrugated base paper. Background Art

[0002] At present, all walks of life are seeking ways to reduce costs and improve efficiency, and the ceramic building materials industry is no exception. In order to meet market demand, the design of ceramic building materials packaging boxes is gradually moving towards low volume and low cost. This trend requires that packaging materials not only have sufficient protection functions, but also reduce weight as much as possible to reduce logistics costs and environmental burdens.

[0003] The main function of ceramic building materials packaging materials is to protect products from damage during transportation and storage, and its support is mainly provided by the ceramic building materials themselves. Therefore, when choosing packaging materials, more attention should be paid to its protection performance and cost-effectiveness. At present, the lining paper of ceramic boxes generally uses 60-80 grams of environmentally friendly box board T paper. This kind of paper has certain requirements on the color and cleanliness of the paper surface to ensure the beauty of the packaging and the cleanliness of the product, but the requirements on indicators such as strength are relatively low.

[0004] However, the production process of environmentally friendly boxboard T-paper is relatively complex and costly. In the pulping stage, equipment such as grading screens and heat dispersion are required to process the raw materials and ensure the quality of the pulp. In the paper machine stage, equipment such as flow conveying systems, slag removers, and calenders are also required to further process the paper into paper that meets the requirements. The investment and maintenance costs of these equipment are relatively high, and the energy consumption cannot be ignored.

[0005] On the other hand, although ordinary corrugated paper has certain cost advantages, it cannot be directly used as the lining paper of ceramic boxes due to problems such as its paper surface cleanliness and color. This limits the application of corrugated paper in the field of high-end packaging and also prompts the industry to seek more economical and environmentally friendly packaging material solutions.

[0006] In order to improve the above problems, the industry has been exploring new packaging material preparation processes. For example, CN102191726A discloses a preparation process for low-weight corrugated paper, aiming to reduce costs by optimizing the production process; CN105479805A introduces a corrugated box production process to improve production efficiency and product quality. However, these patents mainly focus on the preparation process of corrugated paper or corrugated boxes, and do not directly solve the problem of ceramic box lining paper. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a production process for low-quantity dyed corrugated paper with low investment cost and low maintenance cost, and to improve the cleanliness of the pulp while reducing the fiber loss rate.

[0008] The production process of low-quantity dyed corrugated paper of the present invention comprises the following steps:

[0009] (1) The waste paper is pulped by a hydraulic pulper, the waste paper is deslagging by a deslagging device, and the waste paper is discharged by a discharge tower;

[0010] (2) Coarse screening of impurities and sand removal by low-concentration slag remover;

[0011] (3) Fine screening, multi-disc concentrating and feeding into the pulping tower;

[0012] (4) Enter the flow conveying system, go online, and enter the front drying section after pressing;

[0013] (5) The sizing machine applies sizing, and the paper enters the post-drying section and is curled to produce low-quantity dyed corrugated base paper.

[0014] The waste paper used in step (1) is all grade A domestic waste.

[0015] The hydraulic pulper in step (1) uses an energy-saving Fox rotor, a screen plate aperture of 12-16 mm, and 0.1-0.2 kg / ton of pulp adhesive control enzyme is added to minimize the excessive fragmentation of plastic impurities while ensuring good throughput.

[0016] The coarse screen in step (2) adopts a four-stage design. The first and second stages adopt slotted screens with a screen gap of 0.5-0.6 mm, the third stage adopts a flotation screen, and the fourth stage adopts a slotted pulp washing drum with a screen gap of 1.5-1.6 mm, which can effectively discharge coarse impurities and reduce fiber loss. The low-concentration cleaner adopts a five-stage design.

[0017] The fine screening in step (3) adopts a four-stage design, with the first and second stages using 0.15-0.17 mm slotted screens, and the third stage using 0.17-0.18 mm slotted screens.

[0018] The tailings from the fine screen are concentrated by the inclined mesh and then refined by the disc mill. Part of the pulp after refining enters the four-stage fine screen, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by the inclined mesh and enters the coarse screen.

[0019] In the flow system of step (4), 0.5-0.6 kg / ton of cationic dry powder retention aid, 0.2-0.3 kg / ton of cationic liquid retention aid, and 2-3 kg / ton of bentonite are added, and 0.3-0.4 kg / ton of red dye and 2-2.5 kg / ton of yellow dye are added to the bottom slurry pump.

[0020] The net part of step (4) adopts a double-layered net design, with the surface net as the bottom surface and the bottom net as the front surface, and the mass concentration of the net is 0.6-1.0%; the pressing part adopts a four-roller three-press design with a shoe press, with the first press pressure of 90-100KN, the second press pressure of 100-120KN, and the shoe press pressure of 1200-1300KN, and the dryness after pressing is greater than 52%.

[0021] The front drying section of step (4) and the rear drying section of step (5) adopt a full single-hanging design, with a drying degree of 94-96% at the front drying section and a drying degree of 90-93% at the rear drying section.

[0022] The coating applied by the sizing machine in step (5) is composed of the following components in parts by weight: 30-60 parts of corn starch, 0.002-0.005 parts of starch converting enzyme, 3-5 parts of styrene acrylate emulsion, 3-5 parts of AKD emulsion, and 3-6 parts of aluminum sulfate; the prepared coating has a mass concentration of 8-10%, a temperature of 70-80° C., and a viscosity of 10-15 mPa·s.

[0023] Specifically, the production process of low-quantity dyed corrugated paper comprises the following steps:

[0024] (1) All Grade A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 12-16 mm, and 0.1-0.2 kg / ton of pulp adhesive control enzyme is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0025] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.5-0.6 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.5-1.6 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0026] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.15-0.17 mm slotted screens, and the third stage uses 0.17-0.18 mm slotted screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0027] (4) Entering the flow conveying system, 0.5-0.6kg / ton of cationic dry powder retention aid, 0.2-0.3kg / ton of cationic liquid retention aid, 2-3kg / ton of bentonite are added to the flow conveying system, and 0.3-0.4kg / ton of red dye and 2-2.5kg / ton of yellow dye are added to the bottom slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the bottom surface, and the bottom net is used as the front surface, and the net mass concentration is 0.6-1.0%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 90-100KN, the second press pressure is 100-120KN, and the shoe press pressure is 1200-1300KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 94-96%;

[0028] (5) applying glue with a sizing machine, wherein the coating composition is as follows: 30-60 parts of corn starch, 0.002-0.005 parts of starch converting enzyme, 3-5 parts of styrene acrylate emulsion, 3-5 parts of AKD emulsion, and 3-6 parts of aluminum sulfate; the prepared coating has a mass concentration of 8-10%, a temperature of 70-80° C., and a viscosity of 10-15 mPa·s; entering a post-drying section, a full single-hanging design is adopted, and a drying degree of 90-93% is obtained after exiting the post-drying section; and winding is performed to obtain low-quantity dyed corrugated base paper.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) Compared with the conventional environmentally friendly box board T-paper production process in which a calender is generally used to improve the surface smoothness of the paper, the existing equipment investment and maintenance amount are large. The production process of the low-quantity dyed corrugated base paper of the present invention uses a 6600 / 1000m paper machine, which adopts a two-fold screen design, with the bottom screen as the front side, and a four-roller three-press (with shoe press) technology is used in the pressing section. When the paper passes through the pressing section, the front side contacts the shoe press roller. The drying section adopts a full single-hanging design, and the front side of the paper contacts the smooth surface of the drying cylinder. In the absence of a calender, the surface smoothness of the paper can be effectively improved.

[0031] (2) The production process of low-quantity dyed corrugated base paper of the present invention can produce corrugated base paper for carton lining, which has high surface cleanliness. It uses adhesive control enzyme, four-stage fine screening and pulping process to effectively improve pulp cleanliness and reduce fiber loss rate. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with specific embodiments.

[0033] The raw materials and additives used in the following examples and comparative examples are all commercially available products. The mass parts described below are all prepared in the same unit of mass.

[0034] Example 1

[0035] The production process of low-quantity dyed corrugated paper comprises the following steps:

[0036] (1) The whole Class A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 12 mm. 0.20 kg / ton of pulp adhesive control enzyme (NG-8118, Ruichenxing Biotechnology Co., Ltd.) is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0037] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.5 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.5 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0038] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.15 mm slot screens, and the third stage uses 0.17 mm slot screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0039] (4) Entering the flow conveying system, 0.5kg / ton of cationic dry powder retention aid (K6350T, Kemira), 0.20kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira), and 2.0kg / ton of bentonite are added to the flow conveying system, and 0.4kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2.5kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added through the bottom slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the bottom surface, the net mass concentration is 0.6%, and the bottom net is used as the front surface, and the net mass concentration is 0.8%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 90KN, the second press pressure is 100KN, and the shoe press pressure is 1200KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 96%;

[0040] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 30 parts of corn starch, 0.002 parts of starch converting enzyme (UTD-600, Youtel), 3 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 5 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.) emulsion, and 3 parts of aluminum sulfate; the prepared coating has a concentration of 8.0%, a temperature of 70°C, and a viscosity of 10 mPa·s; the coating enters a post-drying section, adopts a full single-hanging design, and has a drying degree of 91% after exiting the post-drying section; and is coiled to obtain low-quantity dyed corrugated base paper.

[0041] Example 2

[0042] The production process of low-quantity dyed corrugated paper comprises the following steps:

[0043] (1) The whole Class A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 12 mm. 0.2 kg / ton of pulp adhesive control enzyme (NG-8118, Ruichenxing Biotechnology Co., Ltd.) is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0044] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.5 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.5 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0045] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.15 mm slot screens, and the third stage uses 0.17 mm slot screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0046] (4) Entering the flow conveying system, 0.50kg / ton of cationic dry powder retention aid (K6350T, Kemira), 0.25kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira), and 2.0kg / ton of bentonite are added to the flow conveying system, and 0.35kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2.3kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added to the bottom slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the bottom surface, the net mass concentration is 0.65%, and the bottom net is used as the front surface, and the net mass concentration is 0.85%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 95KN, the second press pressure is 105KN, and the shoe press pressure is 1200KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 96.0%;

[0047] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 40 parts of corn starch, 0.003 parts of starch converting enzyme (UTD-600, Youtel), 4 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 4 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.) emulsion, and 4 parts of aluminum sulfate; the prepared coating has a concentration of 8.5%, a temperature of 75°C, and a viscosity of 11 mPa·s; the coating enters a post-drying section, adopts a full single-hanging design, and has a drying degree of 91% after exiting the post-drying section; and is coiled to obtain low-quantity dyed corrugated base paper.

[0048] Example 3

[0049] The production process of low-quantity dyed corrugated paper comprises the following steps:

[0050] (1) The whole Class A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 14 mm. 0.15 kg / ton of pulp adhesive control enzyme (NG-8118, Ruichenxing Biotechnology Co., Ltd.) is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0051] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.6 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.6 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0052] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.17 mm slot screens, and the third stage uses 0.18 mm slot screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0053] (4) Entering the flow conveying system, 0.55kg / ton of cationic dry powder retention aid (K6350T, Kemira), 0.30kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira), and 2.5kg / ton of bentonite are added to the flow conveying system, and 0.3kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2.2kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added to the bottom slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the bottom surface, the net mass concentration is 0.7%, and the bottom net is used as the front surface, and the net mass concentration is 0.9%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 100KN, the second press pressure is 110KN, and the shoe press pressure is 1250KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 95%;

[0054] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 50 parts of corn starch, 0.004 parts of starch converting enzyme (UTD-600, Youtel), 4 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 4 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.) emulsion, and 5 parts of aluminum sulfate; the prepared coating has a concentration of 9%, a temperature of 75°C, and a viscosity of 13 mPa·s; the coating enters a post-drying section, adopts a full single-hanging design, and has a drying degree of 92% after exiting the post-drying section; and is coiled to obtain low-quantity dyed corrugated base paper.

[0055] Example 4

[0056] The production process of low-quantity dyed corrugated paper comprises the following steps:

[0057] (1) The whole Class A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 16 mm. 0.10 kg / ton of pulp adhesive control enzyme (NG-8118, Ruichenxing Biotechnology Co., Ltd.) is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0058] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.6 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.6 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0059] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.17 mm slot screens, and the third stage uses 0.18 mm slot screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0060] (4) Entering the flow conveying system, 0.6kg / ton of cationic dry powder retention aid (K6350T, Kemira), 0.3kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira), and 3.0kg / ton of bentonite are added to the flow conveying system, and 0.3kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added through the bottom slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the bottom surface, the net mass concentration is 0.75%, and the bottom net is used as the front surface, and the net mass concentration is 1.0%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 100KN, the second press pressure is 120KN, and the shoe press pressure is 1300KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 94%;

[0061] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 60 parts of corn starch, 0.005 parts of starch converting enzyme (UTD-600, Youtel), 5 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 3 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.), and 6 parts of aluminum sulfate; the prepared coating has a concentration of 10.0%, a temperature of 80°C, and a viscosity of 15 mPa·s; the coating enters a post-drying section, adopts a full single-hanging design, and has a drying degree of 93% after exiting the post-drying section; and is coiled to obtain low-quantity dyed corrugated base paper.

[0062] Comparative Example 1

[0063] (1) The whole Class A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 16 mm. 0.10 kg / ton of pulp adhesive control enzyme (NG-8118, Ruichenxing Biotechnology Co., Ltd.) is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0064] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.6 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.6 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0065] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.17 mm slot screens, and the third stage uses 0.18 mm slot screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0066] (4) Entering the flow conveying system, 0.6kg / ton of cationic dry powder retention aid (K6350T, Kemira) and 0.3kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira) are added to the flow conveying system, and 0.3kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added to the surface layer slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the front side, the net mass concentration is 0.75%, and the bottom net is used as the back side, the net mass concentration is 1.0%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 100KN, the second press pressure is 120KN, and the shoe press pressure is 1300KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 94%;

[0067] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 60 parts of corn starch, 0.005 parts of starch converting enzyme (UTD-600, Youtel), 5 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 3 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.), and 6 parts of aluminum sulfate; the prepared coating has a concentration of 10.0%, a temperature of 80°C, and a viscosity of 15 mPa·s; the coating enters a post-drying section, adopts a full single-hanging design, and has a drying degree of 93% after exiting the post-drying section; and is coiled to obtain low-quantity dyed corrugated base paper.

[0068] Comparative Example 2

[0069] (1) All Grade A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 16 mm, a slag remover for slag removal, and a discharge tower for unloading;

[0070] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.6 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.6 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a four-stage design.

[0071] (3) Fine screening: The fine screening adopts a three-stage design. The first and second stages use 0.17 mm slot screens, and the third stage uses 0.2 mm slot screens. The slurry after fine screening is concentrated by multiple discs and sent to the slurry tower;

[0072] (4) Entering the flow conveying system, 0.6kg / ton of cationic dry powder retention aid (K6350T, Kemira), 0.3kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira), and 3.0kg / ton of bentonite are added to the flow conveying system, and 0.3kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added to the bottom slurry pump; the net is put on the net, the net part adopts a two-fold net design, the surface net is used as the bottom surface, the net mass concentration is 0.70%, and the bottom net is used as the front surface, and the net mass concentration is 0.9%; the pressing part adopts a four-roller three-press design with a shoe press, the first press pressure is 90KN, the second press pressure is 110KN, and the shoe press pressure is 1250KN. The dryness after pressing is greater than 52%. After pressing, it enters the front drying part, which adopts a full single hanging design, and the dryness after the front drying part is 94%;

[0073] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 60 parts of corn starch, 0.005 parts of starch converting enzyme (UTD-600, Youtel), 4 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 4 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.) emulsion, and 5 parts of aluminum sulfate; the prepared coating has a concentration of 9.0%, a temperature of 75°C, and a viscosity of 15 mPa·s; the coating enters a post-drying section, adopts a full single-hanging design, and has a drying degree of 93% after exiting the post-drying section; and is coiled to obtain low-quantity dyed corrugated base paper.

[0074] Comparative Example 3

[0075] (1) The whole Class A domestic waste is pulped by a hydraulic pulper, which uses an energy-saving Fox rotor with a screen plate aperture of 12 mm. 0.2 kg / ton of pulp adhesive control enzyme (NG-8118, Ruichenxing Biotechnology Co., Ltd.) is added, the slag is removed by a slag remover, and the material is discharged by a discharge tower;

[0076] (2) Coarse screening of impurities. The coarse screen adopts a four-stage design. The first and second stages use slotted screens with a screen gap of 0.5 mm. The third stage uses a flotation screen. The fourth stage uses a slotted pulp washing drum with a screen gap of 1.5 mm. The low-concentration cleaner removes sand. The low-concentration cleaner adopts a five-stage design.

[0077] (3) Fine screening: The fine screening adopts a four-stage design. The first and second stages use 0.15 mm slot screens, and the third stage uses 0.17 mm slot screens. The tailings from the fine screening are concentrated by an inclined screen and then refined by a disc mill. Part of the pulp after refining enters the four-stage fine screening, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by an inclined screen and enters a coarse screen. The pulp after fine screening is concentrated by multiple discs and sent to a pulping tower;

[0078] (4) Entering the flow conveying system, 0.50kg / ton of cationic dry powder retention aid (K 6350T, Kemira), 0.25kg / ton of cationic liquid retention aid (PCE 305L-K, Kemira), and 2.0kg / ton of bentonite are added to the flow conveying system, and 0.35kg / ton of red dye (Yantexiuhong 4B, Taixue Dyeing and Chemical) and 2.3kg / ton of yellow dye (Yanteyouhuang GR, Taixue Dyeing and Chemical) are added to the bottom slurry pump; the net is put on the net, and the net part adopts a double-layer net design, the surface net is used as the back side, and the net mass concentration is 0.65%, and the bottom net is used as the front side, and the net mass concentration is 0.85%; the pressing part adopts two large rollers to press, and the dryness after pressing is greater than 50%. After pressing, it enters the front drying part, which adopts a full single-hanging design, and the dryness after the front drying part is 96.0%;

[0079] (5) sizing by a sizing machine, wherein the sizing coating is composed of the following components by weight: 40 parts of corn starch, 0.003 parts of starch converting enzyme (UTD-600, Youtel), 4 parts of styrene acrylate emulsion (HJB, Hongxun Yahao Chemical Co., Ltd.), 4 parts of AKD (HJA, Tianfang Shenghong Chemical Co., Ltd.) emulsion, and 4 parts of aluminum sulfate; the prepared coating has a concentration of 8.5%, a temperature of 75°C, and a viscosity of 11 mPa·s; the coating enters a post-drying section, adopts a single-hanging + double-hanging design, and has a drying degree of 91% after exiting the post-drying section; and is rolled up to obtain low-quantity dyed corrugated base paper.

[0080] The low-quantity dyed corrugated base paper prepared in the above examples and comparative examples was tested for performance according to GB / T451.2-2002. The test results are shown in Table 1.

[0081] Table 1 Test results

[0082]

[0083] Comparative Example 1 adopts the traditional surface and bottom layer design, and the paper is of low smoothness. Comparative Example 2 does not use adhesive enzymes, but adopts the traditional four-stage low-concentration + three-stage fine screening design, and the paper surface cleanliness is poor. Comparative Example 3 adopts two large rollers for pressing, single hanging + double hanging design, and the paper is of low smoothness.

Claims

1. A production process for low-quantity dyed corrugated paper, characterized in that: The following steps are involved: (1) The waste paper is pulped by a hydraulic pulper, the waste paper is deslagging by a deslagging device, and the waste paper is discharged by a discharge tower; (2) Coarse screening of impurities and sand removal by low-concentration slag remover; (3) Fine screening, multi-disc concentrating and feeding into the pulping tower; (4) Enter the flow conveying system, go online, and enter the front drying section after pressing; (5) The sizing machine applies sizing, and the paper enters the post-drying section and is curled to produce low-quantity dyed corrugated base paper.

2. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The waste paper used in step (1) is all grade A domestic waste.

3. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The hydraulic pulper in step (1) uses an energy-saving Fox rotor, a screen plate aperture of 12-16 mm, and 0.1-0.2 kg / ton of pulp stickies control enzyme is added.

4. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The coarse screen of step (2) adopts a four-stage design. The first and second stages adopt slotted screens with a screen gap of 0.5-0.6 mm, the third stage adopts a flotation screen, and the fourth stage adopts a slotted pulp washing drum with a screen gap of 1.5-1.6 mm.

5. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The fine screening in step (3) adopts a four-stage design, with the first and second stages using 0.15-0.17 mm slotted screens, and the third stage using 0.17-0.18 mm slotted screens.

6. The production process of low-weight dyed corrugated paper according to claim 5, characterized in that: The tailings from the fine screen are concentrated by the inclined mesh and then refined by the disc mill. Part of the pulp after refining enters the four-stage fine screen, and the other part enters the rinsing tank. The pulp after rinsing is concentrated by the inclined mesh and enters the coarse screen.

7. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: In the flow system of step (4), 0.5-0.6 kg / ton of cationic dry powder retention aid, 0.2-0.3 kg / ton of cationic liquid retention aid, and 2-3 kg / ton of bentonite are added, and 0.3-0.4 kg / ton of red dye and 2-2.5 kg / ton of yellow dye are added to the bottom slurry pump.

8. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The net part of step (4) adopts a double-layered net design, with the surface net as the bottom surface and the bottom net as the front surface, and the mass concentration of the net is 0.6-1.0%; the pressing part adopts a four-roller three-press design with a shoe press, with the first press pressure of 90-100KN, the second press pressure of 100-120KN, and the shoe press pressure of 1200-1300KN, and the dryness after pressing is greater than 52%.

9. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The front drying section of step (4) and the rear drying section of step (5) adopt a full single-hanging design, with a drying degree of 94-96% at the front drying section and a drying degree of 90-93% at the rear drying section.

10. The production process of low-weight dyed corrugated paper according to claim 1, characterized in that: The coating applied by the sizing machine in step (5) is composed of the following components in parts by weight: 30-60 parts of corn starch, 0.002-0.005 parts of starch converting enzyme, 3-5 parts of styrene acrylate emulsion, 3-5 parts of AKD emulsion, and 3-6 parts of aluminum sulfate; the prepared coating has a mass concentration of 8-10%, a temperature of 70-80° C., and a viscosity of 10-15 mPa·s.

Images