阅读说明：本技术 一种废弃纺织纤维制备纸张的方法 (Method for preparing paper from waste textile fibers ) 是由 潘小艳 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种废弃纺织纤维制备纸张的方法,涉及纸张制造领域。本发明包括原料处理、清洁处理、精磨制浆、过滤提纯、纤维改性、浆液配制、纸业成型、热压处理和降温处理,所述原料处理包括对原料开松和除杂；设置有过滤提纯步骤,再需要将研磨所制成的浆液进行过滤除杂时,使用者将倒入至过滤机中,而过滤机中设置有多层过滤网,且过滤网按孔径大小由上到下排列,浆液会先通过上方孔径较大的过滤网,然后并向过滤机下方流动,且流动过程中会依次进入至不同孔径的过滤网,然后被多层过滤网过滤,从而可将浆液中的杂质进行过滤,且多层过滤网可对浆液中的杂质有效过滤,避免了浆液中含有任何杂质,进而提高了浆液的纯净度。(The invention discloses a method for preparing paper by using waste textile fibers, and relates to the field of paper manufacturing. The method comprises the steps of raw material treatment, cleaning treatment, fine grinding pulping, filtering and purifying, fiber modification, slurry preparation, paper industry forming, hot pressing treatment and cooling treatment, wherein the raw material treatment comprises opening and impurity removal of raw materials; be provided with and filter the purification step, when needing to filter the edulcoration with the thick liquid that the grinding was made again, the user will pour into to the filter in, and be provided with the multilayer filter screen in the filter, and the filter screen is arranged from top to bottom according to the aperture size, the thick liquid can be earlier through the great filter screen of top aperture, then flow to the filter below, and flow the in-process and can get into the filter screen in different apertures in proper order, then filtered by the multilayer filter screen, thereby can filter the impurity in the thick liquid, and the multilayer filter screen can be to the impurity effective filtration in the thick liquid, avoided containing any impurity in the thick liquid, and then improved the purity of thick liquid.)

1. A method for preparing paper by waste textile fibers comprises the steps of raw material treatment, cleaning treatment, fine grinding pulping, filtering and purifying, fiber modification, slurry preparation, paper industry molding, hot pressing treatment and cooling treatment, and is characterized in that: the raw material treatment comprises opening and impurity removal of the raw materials, and the method for preparing the paper by the textile fibers comprises the following steps:

the method comprises the following steps: raw material treatment

The raw material treatment comprises the steps of sorting the waste textile fibers according to fiber components, removing non-fiber hard impurities in the waste textile fibers, opening the sorted waste textile fibers by using an opener to remove impurities, opening the waste textile fibers into dispersed fibers, and collecting the dispersed fibers;

step two: cleaning process

Removing residues from the fibers dispersed in the first step by using a vertical pressure screen, wherein the pulp inlet concentration is 0.04-5%, the pulp outlet concentration is 0.04-5%, the pulp inlet flow is 200-800m/h, the residue discharge amount is 20-70%, the pulp inlet pressure is 0.16-0.5MPa, the pulp outlet pressure is 0.14-0.48MPa, the operating pressure difference is 0.02-0.06MPa, the sealing water flow is 4-12L/min, the sealing water pressure is higher than the pulp inlet pressure by 0.12-0.2MPa, and the dilution water flow is 20-60m/h, then the fiber after deslagging is arranged in a sterilization box, bacteria in the fiber are removed through high temperature, then, the textile fibers after sterilization enter a bleaching pool to be bleached, and the bleached textile fibers are dried by drying equipment after bleaching treatment, so that the bleached textile fibers can be obtained;

step three: fine grinding pulping

Adding the textile fibers bleached in the step two into a disc mill, starting a disc mill device in the disc mill to grind the textile fibers into a pulp state, and discharging and collecting the pulp in the disc mill;

step four: filtering and purifying

Pouring the slurry prepared in the third step into a filter, wherein the filter is provided with a plurality of layers of filter screens, the filter screens are arranged from top to bottom according to the pore size, the slurry firstly passes through the filter screen with larger pore size above, then flows towards the lower part of the filter, and sequentially enters the filter screens with different pore sizes in the flowing process, and then is filtered by the plurality of layers of filter screens, so that the impurities in the slurry can be filtered, and the plurality of layers of filter screens can effectively filter the impurities in the slurry, thereby avoiding any impurities in the slurry and further improving the purity of the slurry;

step five: modification of fibres

Diluting the pulp prepared in the fourth step into a fiber solution with the concentration of 7.5-12 wt%, modifying the fiber solution at constant temperature for 1-3 hours at the temperature of 65-96 ℃ by adopting a NaOH solution with the concentration of 1.44-4.32%, and washing the fiber solution modified by the NaOH solution until the pH value is neutral;

then adding the PVA solution into neutral fiber solution which is treated by NaOH solution and washed, stirring and mixing to prepare a fiber solution dispersion system, wherein the concentration of the PVA solution is 0.6-3.6 wt%;

step six: preparation of slurry

Adding the pulp and the pulp fibers obtained in the fifth step into a stirrer, uniformly stirring the pulp and the pulp fibers by a stirring device on the stirrer to form a mixed solution, and simultaneously, enabling a scraper blade on the stirring device to be in contact with the inner wall of the stirrer, scraping the solution attached to the inner wall of the stirrer by the scraper blade when the stirring device stirs the mixed solution, and throwing away the solution on the scraper blade under the action of centrifugal force, so that the problems that the solution is attached to the inner wall of the stirrer and is difficult to clean and waste are caused are solved;

step seven: paper industry forming

Filtering and dehydrating the mixed slurry obtained in the step six through an upper screen to form wet paper, wherein the concentration of the upper screen slurry is 0.04-6.0%, and the speed is 400-1100 m/min;

step eight: hot pressing treatment

Heating and drying the wet paper formed in the step seven, and performing hot pressing treatment to obtain paper;

step nine: temperature reduction treatment

And cooling the paper made in the step eight, starting cooling equipment by a user, blowing cold air to the surface of the paper by the cooling equipment, cooling the paper, and taking out the paper by the user.

2. A method of making paper from waste textile fibers as claimed in claim 1, wherein: in the first step, the fiber raw material is subjected to impurity removal and sterilization treatment, and the fiber raw material subjected to slag removal is treated at the steam temperature of 110-125 ℃ and the pressure of 0.2-0.4MPa for 14-20 minutes.

3. A method of making paper from waste textile fibers as claimed in claim 1, wherein: in the fourth step, the multiple layers of filter screens are equidistantly distributed in the filter, and the multiple layers of filter screens are all made of stainless steel materials.

4. A method of making paper from waste textile fibers as claimed in claim 1, wherein: in the fifth step, the concentration of the PVA solution is 2-8 wt%.

5. A method of making paper from waste textile fibers as claimed in claim 1, wherein: and in the sixth step, the stirring device comprises a motor, a driving shaft, a stirring rod and a scraper, and the rotating speed of the motor is 80-160 r/min.

6. A method of making paper from waste textile fibers as claimed in claim 1, wherein: in the process of forming the slurry in the step six, the addition amounts of the dispersing agent and the bonding agent are respectively 1.2-7.2% of the mass of the mixed slurry.

7. A method of making paper from waste textile fibers as claimed in claim 1, wherein: the hot pressing conditions in step eight are: hot pressing temperature: 50-80 ℃, hot pressing pressure: 2-5MPa, hot pressing time: 100 and 400 min.

8. A method of making paper from waste textile fibers as claimed in claim 1, wherein: in step nine, the cooling conditions are: cooling temperature: 10-25 ℃.

Technical Field

The invention relates to the field of paper manufacturing, in particular to a method for preparing paper by using waste textile fibers.

Background

The textile industry is the traditional industry of China and is a prop industry related to national civilization, the processing amount of textile fibers in China in 2010 is 4130 ten thousand tons according to the statistics of the country and the industry, the textile fiber consumption is about 2500 ten thousand tons in China according to the internal demand of more than 60 percent. Considering the factors of the limited cotton resource, the rapid increase of chemical fiber consumption, the annual reduction of cotton fiber consumption ratio and the like, the absolute value of the mankind cotton fiber consumption is expected to increase year by year; the consumption of the human-average textile fiber reaches 19 kg, wherein the consumption of the cotton fiber accounts for 51 percent; the consumption of the homo cotton fiber reaches 12 kg; if the service life of the textile is 2 years, the waste amount is 70 percent, and the loss in production and circulation is added, nearly ten million tons of waste textiles are generated in China every year; in view of the difference of the quality states of the waste textile fibers and the complexity of waste components, the fibers of the waste textile fibers and products are too short to be used for weaving textile fabrics after primary treatment.

According to the Chinese patent with the publication number CN103147337B, a method for preparing paper by waste textile fibers is disclosed, which takes waste textile fibers and products as raw materials, and prepares the paper by processes of sorting, opening, impurity removal, cleaning treatment, fine grinding, fiber modification, pulp preparation, paper sheet forming, hot pressing treatment and the like for the waste textile fibers and under the action of temperature of 100 ℃ and 280 ℃ and pressure of 0.2-1.2KN/cm, the paper ration is 13-48g/m2, the tightness is 0.31-0.78g/cm3, the evenness index is 62-78, the tensile index is 27-223Nm/g, the tearing index is 7.6-26.2mN.m2/g, the bursting index is 2.67-7.15kPa.m2/g, and the static water surface contact angle reaches 20-90 degrees.

The method can be realized through weaving and papermaking equipment, the process flow is simple, the adaptability is strong, the invention provides a recycling treatment approach for the waste textile fibers and also provides a new raw material for pulping and papermaking; however, in the process of processing the raw materials, the obtained slurry is not filtered after the raw materials are ground and pulped, so that the slurry possibly contains some impurities, and the purity of the slurry is reduced, so that the quality of subsequent finished products of the paper industry is influenced; meanwhile, after the paper is dried and formed, the surface temperature of the paper becomes very high, if a user takes out the paper immediately, the palm part of the user is easily scalded, so that the paper needs to be naturally cooled down after waiting for a period of time, and the paper needs to spend a long time, so that the paper taking-out efficiency is reduced, and the forming progress of subsequent paper is influenced.

Disclosure of Invention

The invention aims to: in order to solve the problems that the pulp prepared by grinding is not filtered and purified, the surface temperature of the dried paper is high, and the paper is inconvenient to take out, a method for preparing the paper by using the waste textile fibers is provided.

In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing paper by waste textile fibers comprises the steps of raw material treatment, cleaning treatment, fine grinding pulping, filtering and purifying, fiber modification, slurry preparation, paper industry forming, hot pressing treatment and cooling treatment, wherein the raw material treatment comprises opening and impurity removal of raw materials, and the method for preparing the paper by the textile fibers comprises the following steps:

the method comprises the following steps: raw material treatment

The raw material treatment comprises the steps of sorting the waste textile fibers according to fiber components, removing non-fiber hard impurities in the waste textile fibers, opening the sorted waste textile fibers by using an opener to remove impurities, opening the waste textile fibers into dispersed fibers, and collecting the dispersed fibers;

step two: cleaning process

Deslagging the fibers dispersed in the first step by adopting a vertical pressure screen, wherein the pulp inlet concentration is 0.04-5%, the pulp outlet concentration is 0.04-5%, the pulp inlet flow is 200-800m/h, the slag discharge amount is 20-70%, the pulp inlet pressure is 0.16-0.5MPa, the pulp outlet pressure is 0.14-0.48MPa, the operating pressure difference is 0.02-0.06MPa, the sealing water flow is 4-12L/min, the sealing water pressure is higher than the pulp inlet pressure by 0.12-0.2MPa, and the dilution water flow is 20-60m/h, then placing the fibers subjected to deslagging in a sterilization box, removing bacteria in the fibers through high temperature, then feeding the textile fibers subjected to sterilization into a bleaching tank to perform bleaching treatment on the textile fibers, and drying the bleached textile fibers through drying equipment after the bleaching treatment, obtaining bleached textile fiber;

step three: fine grinding pulping

Adding the textile fibers bleached in the step two into a disc mill, starting a disc mill device in the disc mill to grind the textile fibers into a pulp state, and discharging and collecting the pulp in the disc mill;

step four: filtering and purifying

Pouring the slurry prepared in the third step into a filter, wherein the filter is provided with a plurality of layers of filter screens, the filter screens are arranged from top to bottom according to the pore size, the slurry can pass through the filter screen with the larger pore size at the upper part and then flows towards the lower part of the filter, and the slurry can sequentially enter the filter screens with different pore sizes in the flowing process and then is filtered by the plurality of layers of filter screens, so that impurities in the slurry can be filtered, and the plurality of layers of filter screens can effectively filter the impurities in the slurry, thereby avoiding any impurities in the slurry and further improving the purity of the slurry;

step five: modification of fibres

Diluting the pulp prepared in the fourth step into a fiber solution with the concentration of 7.5-12 wt%, modifying the fiber solution at constant temperature for 1-3 hours by adopting a NaOH solution with the concentration of 1.44-4.32% at the temperature of 65-96 ℃, and washing the fiber solution modified by the NaOH solution until the pH value is neutral;

then adding the PVA solution into neutral fiber solution which is treated by NaOH solution and washed, stirring and mixing to prepare a fiber solution dispersion system, wherein the concentration of the PVA solution is 0.6-3.6 wt%;

step six: preparation of slurry

Adding the pulp and the pulp fibers obtained in the fifth step into a stirrer, uniformly stirring the pulp and the pulp fibers by a stirring device on the stirrer to form a mixed solution, wherein a scraper blade on the stirring device is in contact with the inner wall of the stirrer, so that when the stirring device stirs the mixed solution, the scraper blade can scrape the solution attached to the inner wall of the stirrer, and the solution on the scraper blade can be thrown away under the action of centrifugal force, thereby avoiding the problem that the solution is attached to the inner wall of the stirrer and is difficult to clean and cause waste;

step seven: paper industry forming

Filtering and dehydrating the mixed slurry obtained in the step six through a screen to form wet paper, wherein the concentration of the screened slurry is 0.04-6.0%, and the speed is 400-;

step eight: hot pressing treatment

Heating and drying the wet paper formed in the step seven, and performing hot pressing treatment to obtain paper;

step nine: temperature reduction treatment

And (4) cooling the paper made in the step eight, starting a cooling device by a user, blowing cold air to the surface of the paper by the cooling device, so that the paper is cooled, and then taking out the paper by the user.

Preferably, in the step one, the fiber raw material is subjected to impurity removal and sterilization treatment, and the fiber raw material after residue removal is subjected to treatment for 14-20 minutes at the steam temperature of 110-125 ℃ and the pressure of 0.2-0.4 MPa.

Preferably, in the fourth step, multiple layers of filter screens are equidistantly distributed in the filter, and all the multiple layers of filter screens are made of stainless steel materials.

Preferably, the concentration of the PVA solution in step five is 2 wt% to 8 wt%.

Preferably, in the sixth step, the stirring device comprises a motor, a driving shaft, a stirring rod and a scraper, and the rotating speed of the motor is 80-160 r/min.

Preferably, in the process of forming the slurry in the sixth step, the addition amount of the dispersant and the binder is 1.2-7.2% of the mass of the mixed slurry respectively.

Preferably, the hot pressing conditions in step eight are: hot pressing temperature: 50-80 ℃, hot pressing pressure: 2-5MPa, hot pressing time: 100 and 400 min.

Preferably, in step nine, the cooling conditions are: cooling temperature: cooling time at 10-25 deg.C: for 1 min.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, through the arrangement of the filtering and purifying step, when the slurry prepared by grinding needs to be filtered and purified, a user pours the slurry into the filter, the filter is provided with a plurality of layers of filter screens, the filter screens are arranged from top to bottom according to the pore sizes, the slurry firstly passes through the filter screen with the larger pore diameter at the upper part and then flows towards the lower part of the filter, and sequentially enters the filter screens with different pore diameters in the flowing process and then is filtered by the plurality of layers of filter screens, so that the impurities in the slurry can be filtered, and the plurality of layers of filter screens can effectively filter the impurities in the slurry, thereby avoiding any impurities in the slurry and further improving the purity of the slurry;

2. according to the invention, through the step of temperature reduction treatment, after the wet paper is subjected to hot pressing treatment, the surface temperature of the paper is higher, at the moment, a user starts the cooling equipment, the cooling equipment can be used for cooling the paper to reduce the surface temperature of the paper, then the user can take out the formed paper quickly, and the mode does not need the user to wait for a long time, so that the time of the user is saved, the paper taking-out efficiency is improved, meanwhile, the palm part of the user can be prevented from being scalded, and the subsequent paper forming process can be carried out orderly.

Detailed Description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships and are used merely to facilitate the description of the present invention and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention in specific cases. The following describes an embodiment of the present invention based on its overall structure.

The first embodiment is as follows:

the invention provides a technical scheme that: a method for preparing paper by waste textile fibers comprises the steps of raw material treatment, cleaning treatment, fine grinding pulping, filtering and purifying, fiber modification, slurry preparation, paper industry forming, hot pressing treatment and cooling treatment, wherein the raw material treatment comprises opening and impurity removal of raw materials, and the method for preparing the paper by the textile fibers comprises the following steps:

the method comprises the following steps: raw material treatment

The raw material treatment comprises the steps of sorting the waste textile fibers according to fiber components, removing non-fiber hard impurities in the waste textile fibers, opening the sorted waste textile fibers by using an opener to remove impurities, opening the waste textile fibers into dispersed fibers, and collecting the dispersed fibers;

step two: cleaning process

Deslagging the fibers dispersed in the first step by adopting a vertical pressure screen, wherein the pulp inlet concentration is 0.04-5%, the pulp outlet concentration is 0.04-5%, the pulp inlet flow is 200-800m/h, the slag discharge amount is 20-70%, the pulp inlet pressure is 0.16-0.5MPa, the pulp outlet pressure is 0.14-0.48MPa, the operating pressure difference is 0.02-0.06MPa, the sealing water flow is 4-12L/min, the sealing water pressure is higher than the pulp inlet pressure by 0.12-0.2MPa, and the dilution water flow is 20-60m/h, then placing the fibers subjected to deslagging in a sterilization box, removing bacteria in the fibers through high temperature, then feeding the textile fibers subjected to sterilization into a bleaching tank to perform bleaching treatment on the textile fibers, and drying the bleached textile fibers through drying equipment after the bleaching treatment, obtaining bleached textile fiber;

step three: fine grinding pulping

Adding the textile fibers bleached in the step two into a disc mill, starting a disc mill device in the disc mill to grind the textile fibers into a pulp state, and discharging and collecting the pulp in the disc mill;

step four: filtering and purifying

Pouring the slurry prepared in the third step into a filter, wherein the filter is provided with a plurality of layers of filter screens, the filter screens are arranged from top to bottom according to the pore size, the slurry can pass through the filter screen with the larger pore size at the upper part and then flows towards the lower part of the filter, and the slurry can sequentially enter the filter screens with different pore sizes in the flowing process and then is filtered by the plurality of layers of filter screens, so that impurities in the slurry can be filtered, and the plurality of layers of filter screens can effectively filter the impurities in the slurry, thereby avoiding any impurities in the slurry and further improving the purity of the slurry;

step five: modification of fibres

Diluting the pulp prepared in the fourth step into a fiber solution with the concentration of 7.5-12 wt%, modifying the fiber solution at constant temperature for 1-3 hours by adopting a NaOH solution with the concentration of 1.44-4.32% at the temperature of 65-96 ℃, and washing the fiber solution modified by the NaOH solution until the pH value is neutral;

then adding the PVA solution into neutral fiber solution which is treated by NaOH solution and washed, stirring and mixing to prepare a fiber solution dispersion system, wherein the concentration of the PVA solution is 0.6-3.6 wt%;

step six: preparation of slurry

Adding the pulp and the pulp fibers obtained in the fifth step into a stirrer, uniformly stirring the pulp and the pulp fibers by a stirring device on the stirrer to form a mixed solution, wherein a scraper blade on the stirring device is in contact with the inner wall of the stirrer, so that when the stirring device stirs the mixed solution, the scraper blade can scrape the solution attached to the inner wall of the stirrer, and the solution on the scraper blade can be thrown away under the action of centrifugal force, thereby avoiding the problem that the solution is attached to the inner wall of the stirrer and is difficult to clean and cause waste;

step seven: paper industry forming

Filtering and dehydrating the mixed slurry obtained in the step six through a screen to form wet paper, wherein the concentration of the screened slurry is 0.04-6.0%, and the speed is 400-;

step eight: hot pressing treatment

Heating and drying the wet paper formed in the step seven, and performing hot pressing treatment to obtain paper;

step nine: temperature reduction treatment

And (4) cooling the paper made in the step eight, starting a cooling device by a user, blowing cold air to the surface of the paper by the cooling device, so that the paper is cooled, and then taking out the paper by the user.

Removing impurities from the fiber raw materials and sterilizing in the first step, and treating the fiber raw materials after slag removal at the steam temperature of 110-125 ℃ and the pressure of 0.2-0.4MPa for 14-20 minutes; in the fourth step, the multiple layers of filter screens are equidistantly distributed in the interior of the filter, and the multiple layers of filter screens are all made of stainless steel materials.

In the fifth step, the concentration of the PVA solution is 2 to 8 weight percent; and in the sixth step, the stirring device comprises a motor, a driving shaft, a stirring rod and a scraper, and the rotating speed of the motor is 80-160 r/min.

In the forming process of the slurry in the step six, the addition amounts of the dispersing agent and the bonding agent are respectively 1.2-7.2% of the mass of the mixed slurry; the hot pressing conditions in step eight are: hot pressing temperature: 50-80 ℃, hot pressing pressure: 2-5MPa, hot pressing time: 100 and 400 min.

In step nine, the cooling conditions are: cooling temperature: cooling time at 10-25 deg.C: for 1 min.

Example two:

the method comprises the following steps: raw material treatment

The raw material treatment is to sort the waste textile fibers according to fiber components, remove non-fiber hard impurities in the waste textile fibers, open and remove impurities from the sorted waste textile fibers by an opener to form dispersed fibers, clean the dispersed fibers, and then grind the dispersed fibers by a disc grinder to prepare the raw materials into slurry;

step two: cleaning process

Deslagging the fibers dispersed in the step one by adopting a vertical pressure screen, wherein the pulp inlet concentration is 0.08-10%, the pulp outlet concentration is 0.08-10%, the pulp inlet flow is 400-1600m/h, the slag discharge amount is 40-95%, the pulp inlet pressure is 0.32-1MPa, the pulp outlet pressure is 0.28-0.96MPa, the operating pressure difference is 0.04-0.12MPa, the sealing water flow is 8-24L/min, the sealing water pressure is higher than the pulp inlet pressure by 0.24-0.4MPa, and the dilution water flow is 40-120m/h, then placing the fibers subjected to deslagging in a sterilization box, removing bacteria in the fibers through high temperature, then feeding the textile fibers subjected to sterilization into a bleaching tank to carry out bleaching treatment on the textile fibers, and drying the bleached textile fibers through drying equipment after the bleaching treatment, obtaining bleached textile fiber;

step three: fine grinding pulping

Adding the textile fibers bleached in the step two into a disc mill, starting a disc mill device in the disc mill to grind the textile fibers into a pulp state, and discharging and collecting the pulp in the disc mill;

step four: filtering and purifying

Pouring the slurry prepared in the third step into a filter, wherein the filter is provided with a plurality of layers of filter screens, the filter screens are arranged from top to bottom according to the pore size, the slurry can pass through the filter screen with the larger pore size at the upper part and then flows towards the lower part of the filter, and the slurry can sequentially enter the filter screens with different pore sizes in the flowing process and then is filtered by the plurality of layers of filter screens, so that impurities in the slurry can be filtered, and the plurality of layers of filter screens can effectively filter the impurities in the slurry, thereby avoiding any impurities in the slurry and further improving the purity of the slurry;

step five: modification of fibres

Diluting the pulp prepared in the fourth step into 15-24 wt% fiber solution, modifying the fiber solution at constant temperature for 1-3 hours at 65-96 ℃ by adopting 2.88-8.64% NaOH solution, and washing the fiber solution modified by the NaOH solution until the pH value is neutral;

then adding the PVA solution into neutral fiber solution which is treated by NaOH solution and washed, stirring and mixing to prepare a fiber solution dispersion system, wherein the concentration of the PVA solution is 1.2-7.2 wt%;

step six: preparation of slurry

Adding the pulp and the pulp fibers obtained in the fifth step into a stirrer, uniformly stirring the pulp and the pulp fibers by a stirring device on the stirrer to form a mixed solution, wherein a scraper blade on the stirring device is in contact with the inner wall of the stirrer, so that when the stirring device stirs the mixed solution, the scraper blade can scrape the solution attached to the inner wall of the stirrer, and the solution on the scraper blade can be thrown away under the action of centrifugal force, thereby avoiding the problem that the solution is attached to the inner wall of the stirrer and is difficult to clean and cause waste;

step seven: paper industry forming

Filtering and dehydrating the mixed slurry obtained in the step six through a screen to form wet paper, wherein the concentration of the screened slurry is 0.08-12%, and the speed is 800-;

step eight: hot pressing treatment

Heating and drying the wet paper formed in the step seven, and performing hot pressing treatment to obtain paper;

step nine: temperature reduction treatment

And (4) cooling the paper made in the step eight, starting a cooling device by a user, blowing cold air to the surface of the paper by the cooling device, so that the paper is cooled, and then taking out the paper by the user.

Removing impurities from the fiber raw materials and sterilizing in the first step, and treating the fiber raw materials after slag removal at the steam temperature of 110-125 ℃ and the pressure of 0.2-0.4MPa for 14-20 minutes; in the fourth step, the multiple layers of filter screens are equidistantly distributed in the interior of the filter, and the multiple layers of filter screens are all made of stainless steel materials.

In the fifth step, the concentration of the PVA solution is 4-16 wt%; and in the sixth step, the stirring device comprises a motor, a driving shaft, a stirring rod and a scraper, and the rotating speed of the motor is 80-160 r/min.

In the forming process of the slurry in the step six, the addition amounts of the dispersing agent and the bonding agent are respectively 2.4-14.4% of the mass of the mixed slurry; the hot pressing conditions in step eight are: hot pressing temperature: 50-80 ℃, hot pressing pressure: 2-5MPa, hot pressing time: 100 and 400 min. In step nine, the cooling conditions are: cooling temperature: cooling time at 10-25 deg.C: for 1 min.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.