CN116122074A - Optimization method of straw papermaking process - Google Patents

Optimization method of straw papermaking process Download PDF

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CN116122074A
CN116122074A CN202310064961.8A CN202310064961A CN116122074A CN 116122074 A CN116122074 A CN 116122074A CN 202310064961 A CN202310064961 A CN 202310064961A CN 116122074 A CN116122074 A CN 116122074A
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straw
papermaking
pulp
paper
performance index
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李文斌
陈满
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Jiangsu Lee and Man Paper Manufacturing Co Ltd
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Jiangsu Lee and Man Paper Manufacturing Co Ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass

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Abstract

The invention belongs to the technical field of papermaking, and particularly relates to an optimization method of a straw papermaking process. The method comprises the steps of determining test groups, wherein the total number of the test groups is N; taking N parts of straw fibers, and preprocessing the straw fibers to obtain N slag materials; pulping N slag materials to obtain N straw pulp materials; mixing N kinds of straw pulp and waste paper pulp to obtain M kinds of papermaking pulp; manufacturing M kinds of paper-making pulp, recording the manufacturing performance indexes of the paper-making pulp at the same time, obtaining M kinds of paper, and evaluating the paper to obtain the performance indexes of the paper; the process parameter combination of the comprehensive test group, the mixing proportion of straw pulp and waste paper pulp, the papermaking performance index of papermaking pulp and the paper performance index are optimized for the straw papermaking process. The invention optimizes the straw papermaking process by comprehensively considering the cost, the papermaking performance, the paper performance and the like, and can increase the use amount of straw and reduce the cost on the basis of ensuring the quality.

Description

Optimization method of straw papermaking process
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to an optimization method of a straw papermaking process.
Background
With the increasing consumption demands of paper and paper products, there are a series of problems such as shortage of fiber raw materials and shortage of wood resources, and continuous consumption of a large amount of resources and energy sources caused by rapid development of paper industry.
The straw fiber is a natural cellulose fiber, has good biodegradability, can be used for replacing wood to be used for papermaking, producing plates, making artware, producing active carbon, and also can be used for replacing grains to produce xylitol and the like. The industrial utilization level of the straw is continuously improved, the straw is scientifically utilized for pulping and papermaking, the contradiction between the supply and demand of the fiber pulp can be relieved to a certain extent by reasonably and efficiently utilizing the straw fiber pulp, meanwhile, the cost of the straw pulp is lower than the price of waste paper pulp, and good economic benefits can be created for enterprises by adopting the straw papermaking.
However, the existing pretreatment process system of the straw fiber is not perfect, the performance of the treated straw slurry is not enough, the addition amount of the straw fiber in the paper pulp is small, and the problem of increasing the use amount of the straw on the basis of guaranteeing the quality is solved.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the optimization method of the straw papermaking process, which optimizes the straw papermaking process by comprehensively considering the cost, the papermaking performance, the paper performance and the like, and can increase the use amount of straw and reduce the cost on the basis of ensuring the quality.
In order to solve the defects in the prior art, the technical scheme provided by the invention is as follows:
an optimization method of a straw papermaking process comprises the following steps,
s1: determining the technological parameter combination of a test group according to the technological parameter types of the pretreatment of the straw fiber to be optimized and the value ranges of all the technological parameters, wherein the total number of the test group is N;
s2: taking N parts of straw fibers, respectively carrying out pretreatment on the straw fibers according to the technological parameter combinations of each test group, and carrying out water washing and slag-water separation to obtain N slag materials;
s3: respectively pulping N slag materials to obtain N straw pulp materials;
s4: mixing N kinds of straw pulp with waste paper pulp according to different proportions to obtain M kinds of papermaking pulp;
s5: respectively making M kinds of papermaking slurries, recording the making performance indexes of each papermaking slurry at the same time, obtaining M kinds of papers after making, and evaluating the papers to obtain the performance indexes of the papers;
s6: the process parameter combination of the comprehensive test group, the mixing proportion of straw pulp and waste paper pulp, the papermaking performance index of papermaking pulp and the paper performance index are optimized for the straw papermaking process.
Preferably, the process parameter combination of the comprehensive test group, the mixing proportion of straw pulp and waste paper pulp, the papermaking performance index of papermaking pulp and the performance index of paper optimize the straw papermaking process, comprising,
the process evaluation scores of the M papers are respectively calculated according to the following formulas:
Figure BDA0004061828820000021
wherein Q is the process evaluation score of the paper;
P i normalized values for the ith process parameter of the test set; i=1, 2, …, O; o is the total number of process parameter types; when P i P when the cost or time of pretreatment of straw fibers is positively correlated i Is-1, when P i P when the cost or time of pretreatment of straw fibers is inversely related i 1 is shown in the specification;
a is the raw material cost of papermaking pulp, is the sum of the cost of straw fiber and the cost of waste paper pulp, and is related to the mixing proportion of the straw pulp and the waste paper pulp;
B k for the normalized value of the papermaking performance index of the kth papermaking slurry, k=1, 2, …, R is the total number of the papermaking performance indexes of the papermaking slurry; when B is k B when the papermaking performance of the papermaking slurry is positively correlated k 1, when B k B when the papermaking performance of the papermaking slurry is inversely related k Is-1;
C l for the normalized value of the performance index of the first paper, l=1, 2, …, S is the total number of the performance indexes of the paper; when C l C when positively correlated with paper properties l 1, when C l When the performance of the paper is inversely related, c l Is-1;
and optimizing the process parameter combination of the test group and the mixing proportion of the straw pulp and the waste paper pulp by taking the highest process evaluation score as a target.
Preferably, in the step S1, the pretreatment of the straw fiber is an enzymatic pretreatment or a chemical pretreatment.
Preferably, when the pretreatment of the straw fiber is enzyme pretreatment, the technological parameters comprise one or more of enzyme type, pH, temperature, enzyme concentration, straw fiber concentration and treatment time.
Preferably, when the pretreatment of the straw fiber is chemical pretreatment, the technological parameters comprise one or more of pH, temperature, concentration of the straw fiber and treatment time.
Preferably, in the step S5, the papermaking performance index of the papermaking slurry includes one or more of drainage performance index, wire section dewatering performance index, press section dewatering performance index, retention rate index, drying performance index, wet paper performance index, white water characteristic index, and sizing performance index.
Preferably, in the step S5, the performance index of the paper includes one or more of a tensile index, a burst index, a ring crush strength, and a folding endurance.
Preferably, in the step S1, the process parameter combinations of the respective test groups are determined by a controlled variable method.
Preferably, in the step S1, the process parameter combinations of the respective test groups are determined by an orthogonal test method.
Preferably, the straw fiber needs to be decontaminated and dedusted before pretreatment.
The invention has the beneficial effects that:
the invention optimizes the straw papermaking process by comprehensively considering the cost, the papermaking performance, the paper performance and the like, and can increase the use amount of straw and reduce the cost on the basis of ensuring the quality.
Drawings
Fig. 1 is a flowchart of an optimization method of a straw papermaking process provided by the invention.
Detailed Description
The invention is further described below in connection with embodiments. The following embodiments are only for more clearly illustrating the technical aspects of the present invention, and should not be used to limit the scope of the present invention.
The embodiment of the invention provides an optimization method of a straw papermaking process, which is shown in fig. 1 and comprises the following steps:
s1: and determining the technological parameter combination of the test group according to the technological parameter types of the pretreatment of the straw fiber to be optimized and the value ranges of all the technological parameters, wherein the total number of the test group is N.
The pretreatment method of the straw fiber is enzyme pretreatment or chemical pretreatment. When the pretreatment of the straw fiber is enzyme pretreatment, the technological parameters comprise one or more of enzyme type, pH, temperature, enzyme concentration, straw fiber concentration and treatment time. When the pretreatment of the straw fiber is chemical pretreatment, the process parameters include one or more of pH, temperature, concentration of the straw fiber and treatment time.
The process parameter combinations of the test groups can be determined by a controlled variable method, and the process parameter combinations of the test groups can also be determined by an orthogonal test method.
S2: and (3) taking N parts of straw fibers, respectively carrying out pretreatment on the straw fibers according to the technological parameter combinations of each test group, and carrying out water washing and slag-water separation to obtain N slag materials. Before pretreatment, the straw fiber needs to be decontaminated and dedusted.
S3: and respectively pulping the N slag materials to obtain N straw pulp.
S4: and mixing the N kinds of straw pulp with waste paper pulp according to different proportions to obtain M kinds of papermaking pulp. When mixing, if the mixing proportion is multiple, each straw slurry needs to be divided into multiple parts and then mixed one by one.
S5: and (3) respectively carrying out papermaking on the M papermaking slurries, recording the papermaking performance indexes of each papermaking slurry at the same time, obtaining M papers after papermaking, and evaluating the papers to obtain the performance indexes of the papers.
The papermaking performance index of the papermaking slurry comprises one or more of drainage performance index, wire section dehydration performance index, press section dehydration performance index, retention rate index, drying performance index, wet paper sheet performance index, white water characteristic index and sizing performance index, and the papermaking performance index of the papermaking slurry to be evaluated is determined and selected according to the purpose of the paper. The paper performance index comprises one or more of tensile index, bursting index, ring pressure strength and folding endurance, and the paper performance index to be evaluated is determined and selected according to the paper application.
S6: the process parameter combination of the comprehensive test group, the mixing proportion of straw pulp and waste paper pulp, the papermaking performance index of papermaking pulp and the paper performance index optimize the straw papermaking process:
the process evaluation scores of the M papers are respectively calculated according to the following formulas:
Figure BDA0004061828820000031
wherein Q is the process evaluation score of the paper;
P i normalized values for the ith process parameter of the test set; i=1, 2, …, O; o is the total number of process parameter types; when P i P when the cost or time of pretreatment of straw fibers is positively correlated i Is-1, when P i P when the cost or time of pretreatment of straw fibers is inversely related i 1 is shown in the specification; when the process parameter is pH, P i Normalized value of absolute value of difference between pH value and 7;
a is the raw material cost of papermaking pulp, is the sum of the cost of straw fiber and the cost of waste paper pulp, and is related to the mixing proportion of the straw pulp and the waste paper pulp; the cost of the straw fiber is lower than that of the waste paper pulp, and when the proportion of the straw fiber is increased, the cost of the paper is reduced;
B k for the normalized value of the papermaking performance index of the kth papermaking slurry, k=1, 2, …, R is the total number of the papermaking performance indexes of the papermaking slurry; when B is k B when the papermaking performance of the papermaking slurry is positively correlated k 1, when B k B when the papermaking performance of the papermaking slurry is inversely related k Is-1;
C l for the first paperNormalized values of performance indexes, i=1, 2, …, S is the total number of performance indexes of the paper; when C l C when positively correlated with paper properties l 1, when C l When the performance of the paper is inversely related, c l Is-1;
and optimizing the process parameter combination of the test group and the mixing proportion of the straw pulp and the waste paper pulp by taking the highest process evaluation score as a target.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (10)

1. The optimization method of the straw papermaking process is characterized by comprising the following steps of,
s1: determining the technological parameter combination of a test group according to the technological parameter types of the pretreatment of the straw fiber to be optimized and the value ranges of all the technological parameters, wherein the total number of the test group is N;
s2: taking N parts of straw fibers, respectively carrying out pretreatment on the straw fibers according to the technological parameter combinations of each test group, and carrying out water washing and slag-water separation to obtain N slag materials;
s3: respectively pulping N slag materials to obtain N straw pulp materials;
s4: mixing N kinds of straw pulp with waste paper pulp according to different proportions to obtain M kinds of papermaking pulp;
s5: respectively making M kinds of papermaking slurries, recording the making performance indexes of each papermaking slurry at the same time, obtaining M kinds of papers after making, and evaluating the papers to obtain the performance indexes of the papers;
s6: the process parameter combination of the comprehensive test group, the mixing proportion of straw pulp and waste paper pulp, the papermaking performance index of papermaking pulp and the paper performance index are optimized for the straw papermaking process.
2. The optimization method of the straw papermaking process according to claim 1, wherein the process parameter combination of the comprehensive test group, the mixing ratio of straw pulp and waste paper pulp, the papermaking performance index of papermaking pulp and the performance index of paper optimize the straw papermaking process, and the method comprises the following steps of,
the process evaluation scores of the M papers are respectively calculated according to the following formulas:
Figure FDA0004061828810000011
wherein Q is the process evaluation score of the paper;
P i normalized values for the ith process parameter of the test set; i=1, 2, …, O; o is the total number of process parameter types; when P i P when the cost or time of pretreatment of straw fibers is positively correlated i Is-1, when P i P when the cost or time of pretreatment of straw fibers is inversely related i 1 is shown in the specification;
a is the raw material cost of papermaking pulp, is the sum of the cost of straw fiber and the cost of waste paper pulp, and is related to the mixing proportion of the straw pulp and the waste paper pulp;
B k for the normalized value of the papermaking performance index of the kth papermaking slurry, k=1, 2, …, R is the total number of the papermaking performance indexes of the papermaking slurry; when B is k B when the papermaking performance of the papermaking slurry is positively correlated k 1, when B k B when the papermaking performance of the papermaking slurry is inversely related k Is-1;
C l for the normalized value of the performance index of the first paper, l=1, 2, …, S is the total number of the performance indexes of the paper; when C l C when positively correlated with paper properties l 1, when C l When the performance of the paper is inversely related, c l Is-1;
and optimizing the process parameter combination of the test group and the mixing proportion of the straw pulp and the waste paper pulp by taking the highest process evaluation score as a target.
3. The method according to claim 1, wherein in the step S1, the pretreatment of the straw fiber comprises an enzymatic pretreatment being a chemical pretreatment.
4. A method of optimizing a straw papermaking process according to claim 3, wherein when the straw fiber pretreatment is an enzyme pretreatment, the process parameters include one or more of enzyme type, pH, temperature, enzyme concentration, straw fiber concentration, and treatment time.
5. A method of optimizing a straw papermaking process according to claim 3, wherein when the straw fiber pretreatment is a chemical pretreatment, the process parameters include one or more of pH, temperature, straw fiber concentration, and treatment time.
6. The method according to claim 1, wherein in the step S5, the papermaking performance index of the papermaking slurry includes one or more of drainage performance index, wire section dewatering performance index, press section dewatering performance index, retention index, drying performance index, wet paper performance index, white water performance index, sizing performance index.
7. The method according to claim 1, wherein in the step S5, the paper performance index includes one or more of tensile index, burst index, ring crush strength, and folding endurance.
8. The method according to claim 1, wherein in the step S1, the process parameter combinations of each test group are determined by a controlled variable method.
9. The method according to claim 1, wherein in the step S1, the process parameter combinations of each test group are determined by an orthogonal test method.
10. The method for optimizing a papermaking process by using straw as claimed in claim 1, wherein the straw fiber is subjected to impurity removal and dust removal before pretreatment.
CN202310064961.8A 2023-02-06 2023-02-06 Optimization method of straw papermaking process Pending CN116122074A (en)

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Application Number Priority Date Filing Date Title
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