CN117604806A - Method for pulping and papermaking by utilizing coffee silver skin - Google Patents
Method for pulping and papermaking by utilizing coffee silver skin Download PDFInfo
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- CN117604806A CN117604806A CN202410036416.2A CN202410036416A CN117604806A CN 117604806 A CN117604806 A CN 117604806A CN 202410036416 A CN202410036416 A CN 202410036416A CN 117604806 A CN117604806 A CN 117604806A
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- pulp
- silver skin
- coffee silver
- papermaking
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- 235000013353 coffee beverage Nutrition 0.000 title claims abstract description 92
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 87
- 239000004332 silver Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004537 pulping Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 61
- 239000002002 slurry Substances 0.000 claims abstract description 41
- 238000010009 beating Methods 0.000 claims abstract description 20
- 239000000654 additive Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 14
- 108010029541 Laccase Proteins 0.000 claims description 14
- 235000013922 glutamic acid Nutrition 0.000 claims description 14
- 239000004220 glutamic acid Substances 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000007853 buffer solution Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 238000007873 sieving Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 238000009835 boiling Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 241000533293 Sesbania emerus Species 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229920001410 Microfiber Polymers 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 239000003658 microfiber Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000002551 biofuel Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- 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
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/061—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using cutting devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The invention discloses a method for pulping and papermaking by utilizing coffee silver skin, which comprises the following steps: s1, pretreating coffee silver skin; s2, mixing raw wood pulp, coffee silver skin and deionized water to obtain paper pulp A with pulp concentration of 1% -1.5% and beating degree of 30-40 DEG SR; s3, adding a caking additive and water into the paper pulp A obtained in the step S2 according to parts by weight to obtain paper pulp B with the pulp concentration of 2% -3% and the pH value of 6.0, and obtaining pulp after the reaction is completed; s4, adding water into the slurry obtained in the step S3 according to parts by weight to obtain slurry with the slurry concentration of 0.2% -0.4%, pouring the slurry into a paper machine, and performing hot press drying, constant temperature and constant humidity standing for 24 hours, and cutting to obtain a finished product. According to the method for pulping and papermaking by utilizing the coffee silver skin, the coffee silver skin is recycled, the consumption of raw wood pulp is reduced, and the caking additive is added, so that the coffee silver skin and the raw wood pulp are better glued together, the paper performance is improved, and the sustainable development of the papermaking industry is promoted.
Description
Technical Field
The invention relates to the technical field of coffee silver skin resource utilization, in particular to a method for pulping and papermaking by utilizing coffee silver skin.
Background
The coffee silver skin is a layer of underwear which is tightly wrapped by coffee beans under the endocarp of the coffee pulp, most of the coffee silver skin can be directly fallen off due to deepening of the roasting degree, and the fallen coffee silver skin is quite fluffy. In order to ensure safety of coffee during its production, the presence of harmful substances is reduced while improving taste and appearance, and the removal of silver skin from coffee is indispensable. However, the dropped coffee silver skin is exposed to the surrounding environment, so that the risk of spontaneous combustion is high, and certain potential safety hazard exists. Meanwhile, the coffee silver skin is a very valuable resource and can be used for making foods, beauty products, biofuels and the like. Therefore, the recycling of the waste coffee silver skins is imperative.
Paper making technology is one of the four inventions in China, and paper making is mainly divided into two processes of pulping and papermaking. Pulping, namely, adopting a mechanical method, a chemical method or a combination of the mechanical method and the chemical method to dissociate the plant fiber raw material into natural pulp. Paper making, i.e. the paper pulp fiber suspended in water is processed and synthesized to obtain the required paper.
With the continuous development of modern society and papermaking technology in China, people have more and more demands on various papers and paper products, and the demands on papermaking fiber raw materials are also more and more. The shortage of papermaking fiber raw materials restricts the sustainable development of the papermaking industry in China to a certain extent. The shortage of forest resources and low utilization rate of waste paper lead to the urgent problem of raw material shortage in the paper industry.
In the prior art, fiber raw materials which can be replaced and can be continuously utilized are searched, a part of raw wood pulp is replaced by solid waste containing plant fibers, and the use amount of the raw wood pulp is reduced, so that the method is a development direction with great potential of papermaking technology.
Disclosure of Invention
The invention aims to provide a method for pulping and papermaking by utilizing coffee silver skin, which is characterized in that the coffee silver skin is recycled, the consumption of raw wood pulp is reduced, and a caking additive is added, so that the coffee silver skin and the raw wood pulp are better glued together, the paper performance is improved, and the sustainable development of the papermaking industry is promoted.
To achieve the above object, the present invention provides a method for pulping and papermaking by using coffee silver skin, comprising the steps of:
s1, pretreating coffee silver skin;
s2, mixing raw wood pulp, coffee silver skin and deionized water to obtain paper pulp A with pulp concentration of 1% -1.5% and beating degree of 30-40 DEG SR;
s3, adding a caking additive and water into the paper pulp A obtained in the step S2 according to parts by weight to obtain paper pulp B with the pulp concentration of 2% -3% and the pH value of 6.0, and obtaining pulp after the reaction is completed;
s4, adding water into the slurry obtained in the step S3 according to parts by weight to obtain slurry with the slurry concentration of 0.2% -0.4%, pouring the slurry into a paper machine, and performing hot press drying, constant temperature and constant humidity standing for 24 hours, and cutting to obtain a finished product.
Preferably, the material comprises the following raw materials in parts by weight: 55-80 parts of raw wood pulp, 20-40 parts of coffee silver skin and 2-3 parts of caking additive;
the raw wood pulp is one or more of wood pulp, straw pulp, cane pulp, reed pulp and cotton pulp;
the caking agent comprises laccase and glutamic acid, wherein 1-1.5 parts of laccase and 1-1.5 parts of glutamic acid.
Preferably, in the step S1, the coffee silver skin pretreatment method comprises the steps of crushing the pressed coffee silver skin in a crusher, removing ash and impurities through winnowing, grinding and sieving to obtain the coffee silver skin with 40-80 meshes.
Preferably, in the step S2, the preparation method of the paper pulp A comprises the steps of adding excessive raw wood pulp, coffee silver skin and deionized water in proportion to obtain paper pulp A with the total volume of 20L and the pulp concentration of 1% -1.5%, fluffing the paper pulp A in a beater for 30min, and controlling the beating time according to the requirement until the beating degree of the paper pulp A reaches 30-40 DEG SR.
Preferably, in step S3, the preparation method of the paper pulp B comprises taking out part of the paper pulp A obtained in step S2, wringing out water, measuring the water content of the paper pulp A by a rapid moisture meter, weighing the paper pulp A corresponding to the weight part of the absolute dry pulp, adding a caking additive and water, and adopting NaH 2 PO 4 /Na 2 HPO 4 The pH value of the buffer solution is regulated to 6.0, and the pulp B with the pulp concentration of 2-3% is prepared.
Preferably, in the step S3, the slurry reaction is specifically carried out by placing pulp liquid into a constant-temperature water bath kettle with the temperature of 50 ℃ and the rotating speed of 200r/min, stirring for 90-120 min, boiling water bath for 5min, cooling to room temperature, filtering, and balancing water for more than 24 h.
Preferably, in step S4, the papermaking ration of the paper machine is 60g/m 2 。
Preferably, in step S4, the temperature of the hot press drying is 105 to 120 ℃.
Therefore, the invention adopts the method for pulping and papermaking by utilizing the coffee silver skin, and has the following technical effects:
(1) The invention utilizes the plant fiber in the silver coffee skin to help the improvement of paper performance, and the addition of the silver coffee skin can reduce the consumption of raw wood pulp and reduce the cost of raw materials.
(2) The invention changes the waste materials from coffee production into resources, makes reasonable use of the resources, changes waste materials into valuable materials, and promotes sustainable development of the paper industry.
(3) According to the invention, the binding aid is adopted, and the laccase can remove part of lignin in the original wood pulp, promote the exposure of micro fibers and improve the binding force between the fibers, so that the paper strength is improved; the glutamic acid introduces more carboxyl groups into the fiber, and the improvement of the carboxyl content can improve the flexibility and swelling performance of the fiber.
The technical scheme of the invention is further described in detail through examples.
Detailed Description
The technical scheme of the invention is further described below by examples. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The method for pulping and papermaking by utilizing the coffee silver skin comprises the following raw materials in parts by weight: 55-80 parts of raw wood pulp, 20-40 parts of coffee silver skin, 2-3 parts of a caking agent (1-1.5 parts of laccase and 1-1.5 parts of glutamic acid).
The raw wood pulp is one or more of wood pulp, grass pulp, cane pulp, reed pulp and cotton pulp.
The preparation method comprises the following steps:
s1, pretreatment of coffee silver skin: crushing the pressed coffee silver skin in a crusher, removing ash and impurities (coffee bean scraps, dust and the like) by winnowing, preventing particles from being wrapped in paper made by paper, affecting the performance and texture, and grinding and sieving to obtain the 40-80 mesh coffee silver skin.
S2, slurry preparation: adding excessive raw wood pulp, coffee silver skin and deionized water according to a proportion to obtain paper pulp A with the total volume of 20L and the pulp concentration of 1% -1.5%, fluffing for 30min in a Valley beater, and controlling the beating time according to the requirement until the beating degree of the paper pulp A reaches 30-40 DEG SR.
S3, mixing: taking out part of pulp A obtained in step S2 from a Valley beater tank, wringing out water, measuring the water content of the pulp A by a rapid moisture meter, weighing the pulp A equivalent to the weight part of absolute dry pulp (absolute dry pulp refers to the mixture of raw wood pulp without water and coffee silver skin), adding a caking additive and water, and adopting NaH 2 PO 4 /Na 2 HPO 4 Regulating the pH value of the buffer solution to 6.0, and preparing paper pulp B with the pulp concentration of 2% -3%; and (3) adopting a constant-temperature water bath (the temperature is 50 ℃ and the rotating speed is 200 r/min), stirring for 90-120 min, cooling to room temperature after boiling water bath for 5min, filtering, and balancing the water for more than 24h to obtain the slurry.
S4, papermaking: adding the slurry obtained in the step S3 and water according to weight parts to obtain slurry with the slurry concentration of 0.2-0.4%, and pouring the slurry into a paper machine (the papermaking quantitative is 60 g/m) 2 ) And (3) hot-pressing and drying for 10min at 105-120 ℃, standing for 24h at constant temperature and constant humidity, and cutting to obtain a finished product.
Example 1:
the method for pulping and papermaking by utilizing the coffee silver skin comprises the following raw materials in parts by weight: 15.5g of log pulp; coffee silver skin (pretreated) 4g; 0.5g of caking additive, wherein 0.2g of laccase and 0.3g of glutamic acid.
The preparation method comprises the following steps:
s1, pretreatment of coffee silver skin: crushing the pressed coffee silver skin in a crusher, removing ash and impurities (coffee bean scraps, dust and the like) through winnowing, grinding and sieving to obtain the 40-80-mesh coffee silver skin.
S2, slurry preparation: 155g of raw wood pulp and 40g of coffee silver skin are placed in a Valley beater, deionized water is added to 20L (pulp concentration is 1%), the Valley beater is started to defiberize for 30min, and the beating time is controlled according to the requirement until the beating degree of the pulp A reaches 30 DEG SR.
S3, mixing: taking out part of the pulp A obtained in the step S2 from the Valley beater tank, wringing out the water, measuring the water content of the pulp A by a rapid moisture meter, weighing the pulp A equivalent to 19.5g of absolute dry pulp, adding water and 0.5g of caking additive (laccase 0.2g and glutamic acid 0.3 g) at the same time, and adopting NaH 2 PO 4 /Na 2 HPO 4 The pH value of the buffer solution is regulated to 6.0, the pulp B which is prepared into pulp with the concentration of 2% is poured into a constant-temperature water bath, the pulp B is stirred in the constant-temperature water bath for 90min (the rotating speed is 200r/min and the temperature is 50 ℃), the pulp B is cooled to the room temperature after boiling water bath for 5min, the pulp is obtained by filtering and collecting pulp bags, and the water content is balanced for more than 24 h.
S4, papermaking: adding the slurry obtained in the step S3 and 10kg of water to obtain a slurry with a slurry concentration of 0.2%, and pouring into a paper machine (paper making quantitative of 60 g/m) 2 ) And (3) hot-pressing and drying for 10min at 110 ℃, standing for 24h at constant temperature and constant humidity, and cutting to obtain a finished product.
Example 2:
the method for pulping and papermaking by utilizing the coffee silver skin comprises the following raw materials in parts by weight: 13.5g of raw wood pulp; coffee silver skin (pretreated) 6g; 0.5g of caking additive, wherein 0.2g of laccase and 0.3g of glutamic acid.
The preparation method comprises the following steps:
s1, pretreatment of coffee silver skin: crushing the pressed coffee silver skin in a crusher, removing ash and impurities (coffee bean scraps, dust and the like) through winnowing, grinding and sieving to obtain the 40-80-mesh coffee silver skin.
S2, slurry preparation: 162g of raw wood pulp and 72g of coffee silver skin are placed in a Valley beater, deionized water is added to 20L (pulp concentration is 1.2%), the Valley beater is started to defiberize for 30min, and the beating time is controlled according to the requirement until the beating degree of the pulp A reaches 32 DEG SR.
S3, mixing: taking out part of the pulp A obtained in the step S2 from the Valley beater tank, wringing out the water, measuring the water content of the pulp A by a rapid moisture meter, weighing the pulp A equivalent to 19.5g of absolute dry pulp, adding water and 0.5g of caking additive (laccase 0.2g and glutamic acid 0.3 g) at the same time, and adopting NaH 2 PO 4 /Na 2 HPO 4 The pH value of the buffer solution is regulated to 6.0, the pulp B with the pulp concentration of 2.5% is prepared, the pulp B is poured into a constant-temperature water bath kettle, the mixture is stirred in the constant-temperature water bath kettle for 100min (the rotating speed is 200r/min and the temperature is 50 ℃), the mixture is cooled to the room temperature after being boiled for 5min, the pulp is obtained by filtering and collecting pulp bags, and the water content is balanced for more than 24 h.
S4, papermaking: adding the slurry obtained in the step S3 and water in proportion to obtain a slurry with the slurry concentration of 0.2%, pouring the slurry into a paper machine (the papermaking quantitative is 60 g/m) 2 ) And (3) hot-pressing and drying for 10min at 116 ℃, standing for 24h at constant temperature and constant humidity, and cutting to obtain a finished product.
Example 3:
the method for pulping and papermaking by utilizing the coffee silver skin comprises the following raw materials in parts by weight: 11.5g of raw wood pulp; coffee silver skin (pretreated) 8g; 0.5g of caking additive, wherein 0.2g of laccase and 0.3g of glutamic acid.
The preparation method comprises the following steps:
s1, pretreatment of coffee silver skin: crushing the pressed coffee silver skin in a crusher, removing ash and impurities (coffee bean scraps, dust and the like) through winnowing, grinding and sieving to obtain the 40-80-mesh coffee silver skin.
S2, slurry preparation: 172.5g of raw wood pulp and 120g of coffee silver skin are placed in a Valley beater, deionized water is added to 20L (pulp concentration is 1.5%), the Valley beater is started to fluffe for 30min, and the beating time is controlled according to the requirement until the beating degree of the paper pulp A reaches 37 DEG SR.
S3, mixing: taking out part of the pulp A obtained in the step S2 from the Valley beater tank, wringing out the water, measuring the water content of the pulp A by a rapid moisture meter, weighing the pulp A equivalent to 19.5g of absolute dry pulp, adding water and 0.5g of caking additive (laccase 0.2g and glutamic acid 0.3 g) at the same time, and adopting NaH 2 PO 4 /Na 2 HPO 4 The pH value of the buffer solution is regulated to 6.0, the pulp B with the pulp concentration of 3.0% is prepared, the pulp B is poured into a constant-temperature water bath kettle, the mixture is stirred in the constant-temperature water bath kettle for 120min (the rotating speed is 200r/min and the temperature is 50 ℃), the mixture is cooled to the room temperature after being boiled for 5min, the pulp is obtained by filtering and collecting pulp bags, and the water content is balanced for more than 24 h.
S4, papermaking: adding the slurry obtained in the step S3 and water in proportion to obtain a slurry with the slurry concentration of 0.2%, pouring the slurry into a paper machine (the papermaking quantitative is 60 g/m) 2 ) And (3) hot-pressing and drying for 10min at 108 ℃, standing for 24h at constant temperature and constant humidity, and cutting to obtain a finished product.
Comparative example 1
The method for pulping and papermaking by utilizing the coffee silver skin comprises the following raw materials in parts by weight: 12g of raw wood pulp; coffee silver (pretreated) 8g.
The preparation method comprises the following steps:
s1, pretreatment of coffee silver skin: crushing the pressed coffee silver skin in a crusher, removing ash and impurities (coffee bean scraps, dust and the like) through winnowing, grinding and sieving to obtain the 40-80-mesh coffee silver skin.
S2, slurry preparation: 180g of raw wood pulp and 120g of coffee silver skin are placed in a Valley beater, deionized water is added to 20L, the Valley beater is started, the pulp is fluffed for 30min, and the beating time is controlled according to the requirement until the beating degree of the pulp A reaches 29 DEG SR.
S3, mixing: taking out part of pulp A obtained in step S2 from the Valley beater tank, wringing out water, measuring the water content of pulp A with a rapid moisture meter, weighing pulp A equivalent to 20g of absolute dry pulp, adding water, and adopting NaH 2 PO 4 /Na 2 HPO 4 The pH value of the buffer solution is regulated to 6.0, the pulp B with the pulp concentration of 3.0% is prepared, the pulp B is poured into a constant-temperature water bath kettle, the pulp B is stirred in the constant-temperature water bath kettle for 90min (the rotating speed is 200r/min and the temperature is 50 ℃), the pulp B is cooled to the room temperature after being boiled for 5min, the pulp is obtained by filtering and collecting pulp bags, and the water content is balanced for more than 24 h.
S4, papermaking: adding the slurry obtained in the step S3 and water in proportion to obtain a slurry with the slurry concentration of 0.2%, pouring the slurry into a paper machine (the papermaking quantitative is 60 g/m) 2 ) At 108 DEG CAnd hot-pressing and drying for 10min, standing for 24h at constant temperature and constant humidity, and cutting to obtain a finished product.
Comparative example 2: the outer paper bag is used in a commercial chain coffee drink store.
Comparative example 3: a4 white paper is commercially available.
Test
Comparing the invention with the external paper bag and A4 white paper which are used in a certain chain coffee beverage shop without adding the caking additive, the folding endurance, tearing endurance, beating degree and bursting strength are respectively measured by using a folding endurance instrument, a tearing endurance instrument, a beating degree instrument and a bursting strength measuring instrument.
Folding endurance: is a sample of standard width, and is folded back and forth under a certain condition to the logarithm of the number of double folds (base 10) required for breaking. The folding endurance is divided into a transverse folding endurance and a longitudinal folding endurance, and the folding endurance in table 1 is the transverse folding endurance (generally, the longitudinal folding endurance > the transverse folding endurance).
Tear strength: on the tear gauge, a small incision is opened in advance to be a sheet of paper, and the force required for reaching a certain length is expressed in milli-newtons (mN). The paper-making process has low beating degree, uneven paper making and uneven thickness of the same paper, and the tearing degree is in a range or about several.
Degree of tapping: the working time of the beater is consistent, and the unit is DEG SR measured by beating out the slurry under the condition that the slurry concentration is basically the same.
Burst strength: is the paper and the maximum stress of the paper which is uniformly increased in unit area, and the unit is kPa; the burst index refers to the ratio of the maximum stress to the maximum strain which the material can bear under the action of external force, and the unit is kPa m 2 /g。
The paper properties obtained by the paper made at different amounts of coffee silver skin were compared and the results of the paper properties test are shown in table 1.
Table 1 paper performance test results
Conclusion: in the embodiment 3 with the silver coffee skin content of 40%, the utilization rate of the silver coffee skin is high, the paper performance is good, and the silver coffee skin has strong transverse folding endurance and tearing strength. Meanwhile, the paper textures of example 1, example 2, example 3 and comparative example 1 are inferior to those of comparative example 2 and comparative example 3.
The coffee silver skin content of comparative example 1 and example 3 is 40%, the coffee silver skin and the log pulp are directly mixed and pulped by adding water without adding any caking additive in comparative example 1 to prepare a pulp liquid with the pulp concentration of 0.2%, and compared with example 3, the paper performance of comparative example 1 is poorer, because the coffee silver skin contains part of lignin, and the paper performance is affected by the existence of lignin.
The data of example 3 and comparative example 3 are less different, and the paper part performance of the papermaking made by the invention is the same as that of the household paper, and example 3 is the optimal pulp ratio of the invention. By improving the equipment and working conditions, the papermaking with better performance can be obtained. In addition, the performances of whiteness, kappa number, tensile strength and the like of the paper can be specifically regulated and controlled according to the actual application scene of papermaking.
It was found from table 1 that the paper properties largely depend on the magnitude of the degree of tapping. The laccase can remove part of lignin in the original wood pulp, promote the exposure of micro fibers and improve the binding force between the fibers, thereby improving the strength of paper; the glutamic acid introduces more carboxyl groups into the fiber, and the improvement of the carboxyl content can improve the flexibility and swelling performance of the fiber. The coalescing agent formed by mixing laccase and glutamic acid ensures that plant fibers provided by coffee silver skin and fibers in raw wood pulp are better glued together, and meanwhile, part of lignin is effectively removed, so that the influence on the pulp is reduced.
Therefore, the method for pulping and papermaking by utilizing the coffee silver skin disclosed by the invention is adopted to recycle the coffee silver skin, so that the consumption of raw wood pulp is reduced; the addition of the caking additive ensures that the coffee silver skin and the raw wood pulp are better glued together, improves the paper performance and promotes the sustainable development of the paper industry.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (8)
1. A method for pulping and papermaking by using coffee silver skin, which is characterized by comprising the following steps:
s1, pretreating coffee silver skin;
s2, mixing raw wood pulp, coffee silver skin and deionized water to obtain paper pulp A with pulp concentration of 1% -1.5% and beating degree of 30-40 DEG SR;
s3, adding a caking additive and water into the paper pulp A obtained in the step S2 according to parts by weight to obtain paper pulp B with the pulp concentration of 2% -3% and the pH value of 6.0, and obtaining pulp after the reaction is completed;
s4, adding water into the slurry obtained in the step S3 according to parts by weight to obtain slurry with the slurry concentration of 0.2% -0.4%, pouring the slurry into a paper machine, and performing hot press drying, constant temperature and constant humidity standing for 24 hours, and cutting to obtain a finished product.
2. The method for pulping and papermaking by utilizing coffee silver skin according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 55-80 parts of raw wood pulp, 20-40 parts of coffee silver skin and 2-3 parts of caking additive;
the raw wood pulp is one or more of wood pulp, straw pulp, cane pulp, reed pulp and cotton pulp;
the caking agent comprises laccase and glutamic acid, wherein 1-1.5 parts of laccase and 1-1.5 parts of glutamic acid.
3. The method for pulping and papermaking by utilizing the coffee silver skin according to claim 1, wherein in the step S1, the coffee silver skin pretreatment method is characterized in that the coffee silver skin after being pressed is crushed and put into a crusher for crushing, ash and impurities are removed through air separation, and the coffee silver skin with 40-80 meshes is obtained through grinding and sieving.
4. The method for pulping and papermaking by utilizing the coffee silver skin according to claim 1, wherein in the step S2, the preparation method of the paper pulp A is to add excessive raw wood pulp, the coffee silver skin and deionized water in proportion to obtain the paper pulp A with the total volume of 20L and the pulp concentration of 1% -1.5%, and the paper pulp A is placed in a pulping machine to be fluffed for 30min, and the pulping time is controlled according to the requirement until the beating degree of the paper pulp A reaches 30-40 DEG SR.
5. The method of claim 1, wherein in step S3, the pulp B is prepared by taking out part of the pulp A obtained in step S2, wringing out the water, measuring the water content of the pulp A by a rapid moisture meter, weighing the pulp A corresponding to the weight of the absolute dry pulp, adding a caking additive and water, and using NaH 2 PO 4 /Na 2 HPO 4 The pH value of the buffer solution is regulated to 6.0, and the pulp B with the pulp concentration of 2-3% is prepared.
6. The method for pulping and papermaking by utilizing the coffee silver skin according to claim 1, wherein in the step S3, the slurry reaction is specifically carried out by placing pulp liquid into a constant-temperature water bath kettle with the temperature of 50 ℃ and the rotating speed of 200r/min, stirring for 90-120 min, cooling to room temperature after boiling water bath for 5min, and balancing the water content for more than 24h after filtering.
7. A method for pulping and papermaking by using coffee silver skin according to claim 1, wherein in step S4, the papermaking ration of the paper machine is 60g/m 2 。
8. A method of pulping and papermaking using coffee silver skin according to claim 1, wherein in step S4, the temperature of the hot press drying is 105-120 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410036416.2A CN117604806A (en) | 2024-01-10 | 2024-01-10 | Method for pulping and papermaking by utilizing coffee silver skin |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410036416.2A CN117604806A (en) | 2024-01-10 | 2024-01-10 | Method for pulping and papermaking by utilizing coffee silver skin |
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| CN117604806A true CN117604806A (en) | 2024-02-27 |
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| CN202410036416.2A Pending CN117604806A (en) | 2024-01-10 | 2024-01-10 | Method for pulping and papermaking by utilizing coffee silver skin |
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| CN (1) | CN117604806A (en) |
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