Preparation process of compound enzyme suitable for white cardboard bleaching pulp board polishing pulp
By using composite enzymes during the slurry beating and grinding process of white cardboard, the problem of fast consumption of mill grinding sheets and dust in subsequent papermaking sections is solved, and the power consumption of slurry is reduced, paper-forming strength and dust degree are improved. The effect of decreasing.
Patent Information
- Application Number
- CN202411670657.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-02-14
AI Technical Summary
During the slurry beating and grinding process of white cardboard, the prior art has defects such as fast consumption of mill sheets and dust problems in subsequent papermaking sections.
Using a composite enzyme preparation process, the components such as cellulase, laccase, lipase and Fe-like enzyme are mixed in a specific proportion, and the composite enzymes are added to the bleaching slurry before grinding, and slurry is made by refining. .
Under the same freeness of pulp, the power consumption of pulp is greatly reduced, the strength of the paper is increased, the dust degree on the surface of the paper is reduced, and the whiteness of the pulp is slightly increased, avoiding the dust loss and grinding caused by the reuse of white water. The problem of slurry power consumption.
Smart Images
Figure CN119432783A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of papermaking, and in particular to a composite enzyme preparation process suitable for white cardboard bleached pulp board polishing pulp. Background Art
[0002] At present, in the pulping and refining process of white cardboard, the diluted pulp is mainly pumped into the gap of the rotating alloy toothed disc, and the fibers are cut and filamented by pure mechanical kinetic energy, so as to increase the bonding points on the fiber surface, thereby increasing the paper strength index; because there is residual lignin as an adhesive between the fine fibers that make up the fibers, simply using power to forcibly change the fiber shape consumes a lot of kinetic energy, which will lead to a fast consumption rate of the grinding machine. On the other hand, in the pulping of the surface and bottom layers of white cardboard chemical pulp, papermaking white water is generally used to disperse the pulp board. Papermaking white water includes surface and bottom layer white water and core layer white water. The core layer white water has more dust. Applying it to the surface and bottom layer chemical pulping will cause dust problems in the subsequent papermaking process. Summary of the invention
[0003] The purpose of the present invention is to address the defects and shortcomings of the prior art and provide a composite enzyme preparation process suitable for grinding pulp of bleached pulp board of white cardboard. The composite enzyme prepared by the present invention is added to the bleached pulp before grinding. Through grinding, under the same freeness conditions of pulping, the grinding power consumption is greatly reduced, the paper strength is improved, the dust on the surface of the paper is reduced, and the pulp whiteness is slightly improved; the problems of dust, whiteness reduction and large grinding power consumption caused by the reuse of white water in the production process of white cardboard can be avoided.
[0004] To achieve the above object, the present invention adopts the following technical scheme: its operation steps are as follows:
[0005] Step 1: In a 1m2 3 First, add 10 parts by mass of deionized water into a container, then add 0.1-0.5 parts of sodium dehydroacetate or ethyl p-hydroxybenzoate and 0.1-0.8 parts of Tween-80 to dissolve;
[0006] Step 2: After the mixture is dissolved, 15-20 parts of cellulase, 3-6 parts of laccase, 20-30 parts of lipase and 5-10 parts of Fe-mimetic enzyme are added in sequence, stirred and mixed, and then stored in a low temperature environment in a preparation tank.
[0007] Preferably, the container in step 1 is provided with a paddle stirrer.
[0008] Preferably, the preparation tank is provided with a heat-insulating interlayer outside, and cold water at 5-10°C is passed into the interlayer to ensure a low-temperature storage environment of 10-15°C.
[0009] Preferably, in step 2, the speed of the paddle stirrer is 50-100 rpm, and the stirring and mixing is performed for 5-10 minutes.
[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a composite enzyme preparation process suitable for white cardboard bleached pulp board grinding pulp, the composite enzyme prepared by the present invention is added to the bleached pulp before grinding, and through grinding, under the same pulping freeness conditions, the grinding power consumption is greatly reduced, the paper strength is improved, the dust on the paper surface is reduced, and the pulp whiteness is slightly improved; the problems of dust, whiteness reduction and large grinding power consumption caused by the reuse of white water in the production process of white cardboard can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 The table is a comparison of the freeness of the pulp after tapping after adding the complex enzyme of the present invention under similar mill power and the same broadleaf pulp flow rate.
[0012] Figure 2 The table is a comparison of mill power after adding the composite enzyme of the present invention when the freeness remains similar.
[0013] Figure 3 This is a comparative test of the effect of the composite enzyme of the present invention on the dust degree in the pulping process of bleached chemical pulp. DETAILED DESCRIPTION
[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. The preferred embodiments in the description are only used as examples, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.
[0015] This specific implementation adopts the following technical solution: its operation steps are as follows:
[0016] Step 1: Equip a paddle stirrer with a capacity of 1m 3 First, add 10 parts by mass of deionized water into a container, then add 0.2 parts of sodium dehydroacetate and 0.3 parts of Tween-80 to dissolve;
[0017] Step 2: After dissolution, add 16 parts of cellulase, 5 parts of laccase, 25 parts of lipase and 5 parts of Fe-mimetic enzyme in sequence, use a paddle stirrer at a speed of 50-100 rpm, stir and mix for 5-10 minutes, and after stirring and mixing, store in a low temperature environment in a preparation tank. The preparation tank is provided with an insulating interlayer outside, and cold water at 5-10°C is passed into the interlayer to ensure a low temperature storage environment of 10-15°C.
[0018] The composite enzyme prepared by the present invention is added to the inlet of the bleaching pulp tower pump. The enzyme pump and the slurry pump are controlled and interlocked by PLC. The enzyme flow is interlocked with the slurry pump flow meter and the concentration meter to ensure that the enzyme addition amount is accurately controlled to the set addition amount.
[0019] Under similar mill power and the same broadleaf pulp flow rate, the freeness of the pulp after tapping is compared with that without adding the composite enzyme of the present invention. Figure 1 ,Depend on Figure 1 It can be seen from the data that under the premise of the same mill power, slurry flow rate and concentration, adding the composite enzyme before slurry beating can reduce the slurry freeness by 60ml, and slightly increase the tensile index and cohesion.
[0020] When the freeness is kept similar, the mill power is compared between adding the composite enzyme of the present invention and not adding the composite enzyme. Figure 2 ,Depend on Figure 2 The data show that after adding the composite enzyme, the power decreased by 120kw, the tensile index increased by 6.2N·m / g, and the cohesive force increased by 14J / ㎡; the composite enzyme has a good effect in promoting the reduction of pulping energy consumption. After adding the composite enzyme, the pulp strength is improved to a certain extent.
[0021] Comparative test of the effect of compound enzyme on dust content during bleached chemical pulp refining process Figure 3 ,Depend on Figure 3 The data shows that when the amount of compound enzyme added increases, the freeness of the pulp after tapping decreases, the dustiness of the front side decreases from 96 to 44, and the dustiness of the back side decreases from 146 to 70, and the dustiness decreases by 54% and 52% respectively. The compound enzyme has a significant effect on reducing the dust problem caused by the reuse of white water. The whiteness of the front side of the finished paper increases from 86.3% to 92.0%. While the whiteness of the finished paper increases, the amount of whitening agent used in the core layer and the surface layer can be reduced while maintaining the same whiteness, which is conducive to reducing the production cost of white cardboard.
[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a composite enzyme preparation process suitable for white cardboard bleached pulp board grinding pulp, the composite enzyme prepared by the present invention is added to the bleached pulp before grinding, and through grinding, under the same pulping freeness conditions, the grinding power consumption is greatly reduced, the paper strength is improved, the dust on the paper surface is reduced, and the pulp whiteness is slightly improved; the problems of dust, whiteness reduction and large grinding power consumption caused by the reuse of white water in the production process of white cardboard can be avoided.
[0023] For those skilled in the art, they can modify the technical solutions described in the aforementioned embodiments and make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A composite enzyme preparation process suitable for polishing pulp of white cardboard bleached pulp, characterized in that: Its operation steps are as follows: Step (a) with a capacity of 1m 3 First, add 10 parts by mass of deionized water into a container, then add 0.1-0.5 parts of sodium dehydroacetate or ethyl p-hydroxybenzoate and 0.1-0.8 parts of Tween-80 to dissolve; Step (ii), after dissolution, add 15-20 parts of cellulase, 3-6 parts of laccase, 20-30 parts of lipase and 5-10 parts of Fe-mimetic enzyme in sequence, stir and mix, and then store in a low temperature environment in a preparation tank.
2. The process for preparing a composite enzyme for polishing white cardboard bleached pulp according to claim 1, characterized in that: The container in the step (i) is provided with a paddle stirrer.
3. The process for preparing a composite enzyme for polishing white cardboard bleached pulp according to claim 2, characterized in that: The preparation tank is provided with a heat-insulating interlayer outside, and cold water at 5-10°C is passed into the interlayer to ensure a low-temperature storage environment of 10-15°C.
4. The process for preparing a composite enzyme for polishing white cardboard bleached pulp according to claim 3, characterized in that: In the step (ii), the speed of the paddle stirrer is 50-100 rpm, and the stirring and mixing is performed for 5-10 minutes.