CN115305744A - Non-woven fabric for photovoltaic table surface paper and production method thereof - Google Patents
Non-woven fabric for photovoltaic table surface paper and production method thereof Download PDFInfo
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- CN115305744A CN115305744A CN202211056483.8A CN202211056483A CN115305744A CN 115305744 A CN115305744 A CN 115305744A CN 202211056483 A CN202211056483 A CN 202211056483A CN 115305744 A CN115305744 A CN 115305744A
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/02—Synthetic cellulose fibres
- D21H13/08—Synthetic cellulose fibres from regenerated cellulose
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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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/24—Polyesters
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides a non-woven fabric for photovoltaic table surface paper and a production method thereof. The production method comprises the steps of mixing polyester fibers and low-melting-point bonding fibers to prepare slurry, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; uniformly loading the prepared coating on the surface of the first non-woven fabric, and drying to obtain a second non-woven fabric; and then carrying out hot-pressing treatment on the second non-woven fabric, and rewinding and cutting to obtain the non-woven fabric for the photovoltaic table surface paper. Through the mode, the strength and smoothness of the surface of the non-woven fabric can be effectively improved, so that the prepared non-woven fabric is high in longitudinal and transverse tensile strength, good in uniformity, good in thickness consistency and high in air permeability, and can meet the performance requirements of the non-woven fabric used as photovoltaic table tissue; the production method is simple in process and strong in controllability, can meet the requirements of industrial production, and has high practical application value.
Description
Technical Field
The invention relates to the technical field of non-woven fabrics, in particular to a non-woven fabric for photovoltaic table surface paper and a production method thereof.
Background
The screen printing is an important process in the production process of the photovoltaic cell, is used for printing positive and negative electrodes and a back surface field on two sides of a coated silicon wafer, and has important significance for improving the production efficiency and the photoelectric conversion efficiency of the photovoltaic cell. In the screen printing process, special photovoltaic table surface paper needs to be arranged on the printing table surface, the performance of the photovoltaic table surface paper directly influences the silicon wafer and the screen printing effect, and the photovoltaic table surface paper with the use performance meeting the requirements is of great importance for the production of photovoltaic cell pieces.
At present, the non-woven fabric produced by a dry non-woven fabric production process is usually used for the photovoltaic table surface paper, but the non-woven fabric produced by the method has poor longitudinal and transverse tensile strength, poor evenness, large aperture and porosity and poor surface smoothness, and the use effect of the non-woven fabric as the photovoltaic table surface paper is seriously influenced. Compared with the non-woven fabric produced by the dry process, the non-woven fabric produced by the wet process generally has better uniformity, but the non-woven fabric for the photovoltaic table surface paper produced by the wet process is still lacked at present. How to improve the existing wet-process non-woven fabric production process so that the non-woven fabric produced by the process meets the performance requirements of the non-woven fabric for the photovoltaic table surface paper is a problem to be solved urgently at present.
In view of the above, there is a need for an improved nonwoven fabric for photovoltaic table top paper and a method for producing the same, which solves the above problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a non-woven fabric for photovoltaic table paper and a production method thereof.
In order to achieve the aim, the invention provides a production method of non-woven fabric for photovoltaic table surface paper, which comprises the following steps:
s1, mixing polyester fibers and low-melting-point bonding fibers according to a preset mass ratio to prepare slurry with a preset concentration, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; the melting point of the low-melting-point bonding fiber is lower than that of the polyester fiber by more than 20 ℃;
s2, preparing a predetermined amount of paint, uniformly loading the paint on the surface of the first non-woven fabric obtained in the step S1, and drying to obtain a second non-woven fabric;
and S3, carrying out hot-pressing treatment on the second non-woven fabric obtained in the step S2, and rewinding and cutting to obtain the non-woven fabric for the photovoltaic table surface paper.
As a further improvement of the invention, in step S2, the coating comprises the following components in parts by weight:
CaCO 3 95 to 100 parts of porcelain clay, 0 to 5 parts of porcelain clay, 0 to 4 parts of latex, 40 to 60 parts of starch, 2 to 4 parts of surface sizing agent, 0 to 1.5 parts of whitening agent and 0.05 to 0.1 part of defoaming agent.
As a further improvement of the invention, in step S2, the solid content of the coating is 5wt% to 30wt%; the loading capacity of the coating on the surface of the first non-woven fabric is 2-4 g/m 2 。
As a further improvement of the present invention, in step S1, the mass concentration of the slurry is 1% to 2%, and the mass concentration of the slurry after dilution treatment is 0.01% to 0.08%; preferably, the dilution treatment comprises primary dilution and secondary dilution, the mass concentration of the slurry after the primary dilution is 0.2-0.4%, and the mass concentration of the slurry after the secondary dilution is 0.02-0.03%.
As a further improvement of the invention, in step S1, before the primary dilution, a dispersant and an antifoaming agent are further added to the slurry, wherein the amount of the dispersant is 0.03% to 0.06% of the mass of the slurry, and the amount of the antifoaming agent is 0.1% to 0.3% of the mass of the slurry; after the secondary dilution, a retention aid is also added, and the using amount of the retention aid is 0.8-2.0% of the mass of the slurry after the secondary dilution; preferably, the dispersing agent is polyethylene oxide, the defoaming agent is a polyether defoaming agent, and the retention aid is polyethylene oxide.
As a further improvement of the invention, in step S1, the low-melting-point binder fiber has a melting point of 230 to 250 ℃ and a softening point of 100 to 220 ℃; preferably, the melting point of the low-melting-point bonding fiber is 230 ℃, and the softening point of the low-melting-point bonding fiber is 180-200 ℃.
As a further improvement of the invention, in step S1, the fineness of the polyester fiber is 0.5 to 1.5D, and the length is 2 to 8mm; the titer of the low-melting-point bonding fiber is 1.2-2D, and the length of the low-melting-point bonding fiber is 3-6 mm.
As a further improvement of the invention, in the step S1, the mass ratio of the polyester fiber to the low-melting-point binding fiber is (50-70) to (30-50).
As a further improvement of the present invention, in step S3, the hot pressing treatment includes a primary hot pressing treatment and a secondary hot pressing treatment which are performed in sequence; the temperature of the compression roller of the primary hot-pressing treatment is 140-230 ℃, and the thickness of the non-woven fabric after the primary hot-pressing treatment is 0.14-0.16 mm; the temperature of the compression roller of the secondary hot-pressing treatment is 160-220 ℃, and the thickness of the non-woven fabric after the secondary hot-pressing treatment is 0.09-0.12 mm.
In order to achieve the purpose, the invention also provides a non-woven fabric for the photovoltaic table tissue, which is prepared according to any one of the technical schemes.
The beneficial effects of the invention are:
(1) According to the production method of the non-woven fabric for the photovoltaic table surface paper, provided by the invention, the polyester fiber and the low-melting-point bonding fiber are subjected to wet papermaking under low concentration, a trace amount of coating is loaded on the surface of the non-woven fabric, and then hot pressing treatment is carried out, so that the strength and smoothness of the surface of the non-woven fabric are effectively improved, the prepared non-woven fabric has the advantages of good evenness, high air permeability, small transverse width quantitative difference, uniform transverse width moisture and the like, the paper is uniform and consistent in quantification, thickness and moisture, and the tightness and the non-folding of two sides of the base paper in the hot pressing process can be ensured; meanwhile, the prepared non-woven fabric has high longitudinal and transverse tensile strength, the longitudinal tensile strength of the non-woven fabric can reach more than 8kN/m, and the performance requirement of the non-woven fabric used as photovoltaic table surface paper can be completely met. In addition, the production method of the non-woven fabric for the photovoltaic table surface paper, provided by the invention, is simple in overall process and strong in controllability, can meet the requirements of industrial production, and has a high practical application value.
(2) According to the production method of the non-woven fabric for the photovoltaic table surface paper, provided by the invention, the micro coating on the surface of the non-woven fabric can be realized by further regulating and controlling the loading amount of the coating, the fiber on the surface of the non-woven fabric is effectively finished and coated while the air permeability effect of the non-woven fabric is not influenced, the surface binding force among the fibers is improved, and the subsequent hot pressing treatment is facilitated; meanwhile, the coating with a specific composition is prepared, so that the surface smoothness and strength of the non-woven fabric can be effectively improved, and the prepared non-woven fabric can meet the performance requirements of the non-woven fabric for the photovoltaic table paper.
(3) According to the production method of the non-woven fabric for the photovoltaic table surface paper, the polyester fibers and the low-melting-point bonding fibers are mixed according to a specific proportion, and the melting point and the fineness of the low-melting-point bonding fibers are further limited, so that on one hand, two temperature change areas and the thermal bonding property of the low-melting-point bonding fibers can be utilized, and the hot-melt bonding effect and efficiency are effectively improved; on the other hand, the small fiber diameter of the low-melting-point bonding fiber also enables the low-melting-point bonding fiber to have a large specific surface area, the low-melting-point bonding fiber and the polyester fiber are mixed and made into a web, the aperture of the non-woven fabric can be more uniform, the interweaving capacity of the fiber can be improved, the bonding of the fiber is facilitated in the web making process, the directionality of the fiber is reduced, the non-woven fabric has higher bonding strength and uniformity, the longitudinal and transverse tension ratio can be reduced while the tensile strength is improved after hot pressing, and the air permeability of the non-woven fabric is more uniform while hot melting bonding is realized. Based on the above, the blending of the low-melting-point binder fiber and the polyester fiber effectively improves the uniformity and strength of the non-woven fabric in the processes of making a net by paper making and hot-pressing treatment, so that the finally prepared non-woven fabric for the photovoltaic table tissue has better uniformity and higher strength.
(4) According to the production method of the non-woven fabric for the photovoltaic table surface paper, provided by the invention, the concentration of the slurry is regulated and controlled, and the dispersing agent is added before the slurry is diluted, so that the initial dispersion liquid with higher concentration can be subjected to fiber preliminary dispersion, and then is diluted step by step, and further is continuously dispersed step by step, so that the fibers can generate larger friction force during dispersion, and can be dispersed more quickly. Meanwhile, the mode can also avoid the condition of doubling among a plurality of fibers caused by higher fiber concentration in the initial dispersion liquid with higher concentration, thereby reducing the probability of doubling of a plurality of fibers in the finally prepared non-woven fabric material and improving the uniformity and air permeability of the non-woven fabric.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a production method of non-woven fabric for photovoltaic table surface paper, which comprises the following steps:
s1, mixing polyester fibers and low-melting-point bonding fibers according to a preset mass ratio to prepare slurry with a preset concentration, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; the melting point of the low-melting-point bonding fiber is lower than that of the polyester fiber by more than 20 ℃;
s2, preparing a predetermined amount of paint, uniformly loading the paint on the surface of the first non-woven fabric obtained in the step S1, and drying to obtain a second non-woven fabric;
and S3, carrying out hot-pressing treatment on the second non-woven fabric obtained in the step S2, and rewinding and cutting to obtain the non-woven fabric for the photovoltaic table surface paper.
In step S1, the mass ratio of the polyester fiber to the low-melting-point binding fiber is (50-70): 30-50; the mass concentration of the slurry is 1-2%, and the mass concentration of the diluted slurry is 0.01-0.08%; the mass fraction of the papermaking and net forming process is 0.01-0.03%, and the dryness of the net part after dehydration is 20-30%; and squeezing and dewatering before drying, wherein the dryness of the squeezed and dewatered fabric is 45%, and after drying, the low-melting-point bonding fibers contained in the first nonwoven fabric are primarily bonded with the polyester fibers.
Preferably, the dilution treatment comprises primary dilution and secondary dilution, the mass concentration of the slurry after the primary dilution is 0.2-0.4%, and the mass concentration of the slurry after the secondary dilution is 0.02-0.03%.
Preferably, before the primary dilution, a dispersant and a defoaming agent are also added into the slurry, wherein the dosage of the dispersant is 0.03-0.06% of the mass of the slurry, and the dosage of the defoaming agent is 0.1-0.3% of the mass of the slurry; after the secondary dilution, a retention aid is also added, and the using amount of the retention aid is 0.8-2.0% of the mass of the slurry after the secondary dilution; preferably, the dispersing agent is polyethylene oxide, the defoaming agent is a polyether defoaming agent, and the retention aid is polyethylene oxide.
The melting point of the low-melting-point bonding fiber is 230-250 ℃, and the softening point is 100-230 ℃; preferably, the melting point of the low-melting-point bonding fiber is 230 ℃, and the softening point of the low-melting-point bonding fiber is 180-200 ℃; the titer of the polyester fiber is 0.5-1.5D, and the length is 2-8 mm; the titer of the low-melting-point bonding fiber is 1.2-2D, and the length of the low-melting-point bonding fiber is 3-6 mm.
Preferably, the low-melting binder fiber is undrawn polyester fiber, and the surface is hydrophilically treated to have good dispersibility in water so as to be more uniformly mixed with the polyester fiber in the slurry.
In the step S2, the coating comprises the following components in parts by weight:
CaCO 3 95 to 100 parts of porcelain clay, 0 to 5 parts of porcelain clay, 0 to 4 parts of latex, 40 to 60 parts of starch, 2 to 4 parts of surface sizing agent, 0 to 1.5 parts of whitening agent and 0.05 to 0.1 part of defoaming agent.
The solid content of the coating is 5-30 wt%; the loading capacity of the coating on the surface of the first non-woven fabric is 2-4 g/m 2 。
Preferably, the coating is coated on the surface of the first non-woven fabric by a double-roller surface sizing machine; the transmission side pressure/operation side pressure of the double-roller surface sizing machine is preferably 16-28/16-28 kN/m.
In step S3, the hot pressing process includes a primary hot pressing process and a secondary hot pressing process performed in sequence. Preferably, the primary hot-pressing treatment is hard-pressing treatment, the surface temperature of the metal pressing roller is 140-230 ℃, and the thickness of the non-woven fabric subjected to the primary hot-pressing treatment is 0.14-0.16 mm; the secondary hot pressing treatment is soft pressing treatment, the temperature of the surface of the metal pressing roller is 160-220 ℃, and the thickness of the non-woven fabric after the secondary hot pressing treatment is 0.09-0.12 mm.
In order to achieve the purpose, the invention also provides a non-woven fabric for the photovoltaic table surface paper, which is prepared according to any one of the technical schemes.
The nonwoven fabric for photovoltaic table surface paper and the production method thereof provided by the present invention will be described below with reference to specific examples and comparative examples.
Example 1
The embodiment provides a production method of non-woven fabric for photovoltaic table surface paper, which comprises the following steps:
s1, wet papermaking into net
The polyester fiber and the low-melting-point binder fiber were mixed in a mass ratio of 60. Wherein, the titer of the polyester fiber is 1D, the length is 5mm, and the melting point is 250 ℃; the low-melting-point bonding fiber is undrawn polyester fiber subjected to hydrophilic treatment on the surface, the fineness of the low-melting-point bonding fiber is 1.2D, the length of the low-melting-point bonding fiber is 5mm, the melting point of the low-melting-point bonding fiber is 230 ℃, the softening point of the low-melting-point bonding fiber is 130-200 ℃, and the low-melting-point bonding fiber has a temporary softening and bonding effect when the temperature reaches the softening point.
Before the slurry is diluted, adding a dispersant polyethylene oxide and a polyether defoaming agent into the slurry; wherein the dosage of the dispersant is 0.05 percent of the mass of the slurry, and the dosage of the defoamer is 0.1 percent of the mass of the slurry. And then, regulating and controlling the concentration of the slurry by adopting an optical detection regulating and controlling device, firstly regulating the mass concentration of the slurry to be 0.4% by primary dilution, and then regulating the mass concentration of the slurry to be 0.02% by secondary dilution. After the secondary dilution was completed, the slurry was fed to a pressure sieve for treatment, and at the outlet of the pressure sieve, a retention aid polyethylene oxide was added in an amount of 0.8% by mass of the slurry.
Feeding the diluted pulp into an inclined-wire pulp flowing box to be made into a net, wherein the mass fraction of the made net is 0.02%, and the dryness of the net after dehydration is 30%; and then sequentially carrying out squeezing dehydration and drying treatment to obtain the first non-woven fabric. Wherein the pressing dehydration dryness of the pressing dehydration is 45 percent, the drying treatment is carried out by adopting a drying cylinder, the temperature of the drying cylinder is 120 ℃, so that the low-melting-point bonding fiber contained in the first nonwoven fabric is primarily bonded with the polyester fiber, and the water content of the finally obtained first nonwoven fabric is 6 percent.
S2, coating a trace amount of coating on the surface
Weighing the following raw materials in parts by weight:
CaCO 3 98 parts of china clay, 2 parts of latex, 50 parts of starch, 3 parts of surface sizing agent, 1 part of whitening agent and 0.05 part of defoaming agent.
After the raw materials are mixed, water is added and the mixture is stirred uniformly to prepare the coating with the solid content of 10 wt%. Then the coating is applied to a surface sizing machine with two rollers according to the proportion of 3g/m 2 Coating the loaded amount on the surface of the first nonwoven fabric, and drying with a drying cylinder to obtain a second nonwoven fabricThe water content of the woven fabric was 2%.
S3, hot pressing treatment
And (3) sequentially carrying out primary hot-pressing treatment and secondary hot-pressing treatment on the second non-woven fabric obtained in the step (S2). Wherein the primary hot-pressing treatment is hard pressing treatment, the surface temperature of the metal press roll is 230 ℃, the press roll pressure is adjusted to be 70kg/cm, and the thickness of the non-woven fabric subjected to the primary hot-pressing treatment is 0.15mm; the secondary hot pressing treatment is soft pressing treatment, the surface temperature of the metal compression roller is 220 ℃, the pressure of the compression roller is adjusted to be 110kg/cm, and the thickness of the non-woven fabric subjected to the secondary hot pressing treatment is 0.10mm.
In the hot pressing treatment process, the semi-melting condition of the low-melting-point bonding fibers generates bonding strength, so that the short piles erected on the surface of the fiber web are pressed down and bonded with each other, and the non-woven fabric for the photovoltaic table tissue can be obtained after rewinding, slitting, packaging and warehousing.
The performance test data of the nonwoven fabric for photovoltaic table top paper produced in this example are shown in table 1.
Table 1 performance parameters of the nonwoven fabric for photovoltaic table paper prepared in example 1
| Detecting items | The result of the detection |
| Breadth (mm) | 1100 |
| Quantitative (g) | 69.1 |
| Thickness (um) | 90 |
| Tensile Strength (KN/m) | The longitudinal direction is more than or equal to 10.20; transverse direction is more than or equal to 4.5 |
| Smoothness(s) | Front side: 32; back side 24 |
| Air permeability (cm 3/cm 2/s) | 2.5 |
As can be seen from the combination of the table 1, the non-woven fabric prepared by the embodiment is good in uniformity, high in longitudinal and transverse tensile strength, high in smoothness and high in air permeability, and can meet the performance requirements of the non-woven fabric used as photovoltaic table paper.
Examples 2 to 7 and comparative examples 1 to 2
Examples 2 to 7 and comparative examples 1 to 2 respectively provide a method for producing a non-woven fabric for photovoltaic table top paper, and compared with example 1, the method is different in that process parameters such as the mass ratio of the polyester fibers and the low-melting-point binder fibers, the slurry concentration, and the usage amount of the dispersant, the defoamer and the retention aid in step S1 are changed, the process parameters corresponding to each example and comparative example are shown in table 2, and the remaining production methods and process parameters are consistent with those in the comparative document 1, and are not described again.
TABLE 2 Process parameters for examples 2 to 7 and comparative examples 1 to 2
The nonwoven fabrics for photovoltaic table paper prepared in examples 2 to 7 and comparative examples 1 to 2 were examined for their properties, and the results are shown in table 3.
TABLE 3 Properties of nonwoven fabrics for photovoltaic table paper prepared in examples 2 to 7 and comparative examples 1 to 2
As can be seen from Table 3, the nonwoven fabrics for photovoltaic table surface paper prepared in examples 2 to 7 all had a longitudinal tensile strength of 8kN/m or more, a front smoothness of 25s or more, and an air permeability of 2cm or more 3 /cm 2 And the surface uniformity is better than the second, and the performance requirements of the non-woven fabric for the photovoltaic table surface paper can be met. Compared with the embodiment 1, the slurry concentration in the comparative example 1 is too high, which causes poor fiber dispersion uniformity, fibers are easy to interweave and flocculate, and the uniformity of a fiber net formed in papermaking is poor, thereby directly influencing the strength and the surface performance of the finally prepared non-woven fabric product. In comparative example 2, no dispersant and defoamer were added, and the fiber density was slightly greater than the water density, and the fibers were easily combined with small bubbles in water during dispersion and flocculated together, which resulted in the problems of small flocs or fiber entanglement during papermaking, resulting in a decrease in the quality of the finally produced nonwoven fabric and poor surface flatness.
Examples 8 to 11 and comparative examples 3 to 4
Examples 8 to 11 and comparative examples 3 to 4 respectively provide a method for producing a non-woven fabric for photovoltaic table top paper, which is different from example 1 in that the composition of the coating and the loading amount of the coating on the surface of the first non-woven fabric in step S2 are changed, the coating composition and the loading amount corresponding to each example and comparative example are shown in table 4, and the remaining production methods and process parameters are consistent with those of the comparative document 1, and are not described again.
TABLE 4 Process parameters for examples 8 to 11 and comparative examples 3 to 4
The nonwoven fabrics for photovoltaic table top paper prepared in examples 8 to 11 and comparative examples 3 to 4 were examined for their performance, and the results are shown in table 5.
TABLE 5 Properties of nonwoven fabrics for photovoltaic table paper prepared in examples 8 to 11 and comparative examples 3 to 4
As can be seen from Table 5, the nonwoven fabrics for photovoltaic table top paper prepared in examples 8 to 11 all had a longitudinal tensile strength of 8kN/m or more, a front smoothness of 25s or more, and an air permeability of 2cm or more 3 /cm 2 And the surface uniformity is better than the second, and the performance requirements of the non-woven fabric for the photovoltaic table surface paper can be met. Comparative example 3 is not added with calcium carbonate, although the strength is improved to a certain extent, the smoothness is obviously lower than that of other examples, mainly because the calcium carbonate added in other examples can uniformly cover the surface of the non-woven fabric, and the uneven surface and larger gaps formed by the fibers are filled, which is beneficial to obtaining a paper surface with good uniformity and smoothness. Comparative example 4 has a certain improvement in smoothness due to the increase in the coating amount, but the strength is significantly reduced compared to other examples. Therefore, in order to ensure that the tensile strength and the smoothness of the prepared non-woven fabric can meet application requirements, the composition of the coating and the coating amount thereof need to be properly regulated.
In conclusion, the invention provides a non-woven fabric for photovoltaic table surface paper and a production method thereof. The production method comprises the steps of mixing polyester fibers and low-melting-point bonding fibers to prepare slurry, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; uniformly loading the prepared coating on the surface of the first non-woven fabric, and drying to obtain a second non-woven fabric; and then carrying out hot-pressing treatment on the second non-woven fabric, and rewinding and cutting to obtain the non-woven fabric for the photovoltaic table surface paper. Through the mode, the strength and smoothness of the surface of the non-woven fabric can be effectively improved, so that the prepared non-woven fabric is high in longitudinal and transverse tensile strength, good in uniformity, good in thickness consistency and high in air permeability, and can meet the performance requirements of the non-woven fabric serving as the photovoltaic table surface paper; the production method is simple in process and strong in controllability, can meet the requirements of industrial production, and has high practical application value.
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 various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. The production method of the non-woven fabric for the photovoltaic table surface paper is characterized by comprising the following steps of:
s1, mixing polyester fibers and low-melting-point bonding fibers according to a preset mass ratio to prepare slurry with a preset concentration, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; the melting point of the low-melting-point bonding fiber is lower than that of the polyester fiber by more than 20 ℃;
s2, preparing a predetermined amount of paint, uniformly loading the paint on the surface of the first non-woven fabric obtained in the step S1, and drying to obtain a second non-woven fabric;
and S3, carrying out hot-pressing treatment on the second non-woven fabric obtained in the step S2, and rewinding and cutting to obtain the non-woven fabric for the photovoltaic table surface paper.
2. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in the step S2, the coating comprises the following components in parts by weight:
CaCO 3 95 to 100 parts of porcelain clay, 0 to 5 parts of porcelain clay, 0 to 4 parts of latex, 40 to 60 parts of starch, 2 to 4 parts of surface sizing agent, 0 to 1.5 parts of whitening agent and 0.05 to 0.1 part of defoaming agent.
3. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in step S2, the solid content of the coating is 5wt% to 30wt%, and the coating is on the negative side of the surface of the first nonwoven fabricThe loading capacity is 2-4 g/m 2 。
4. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in step S1, the mass concentration of the slurry is 1% to 2%, and the mass concentration of the slurry after dilution is 0.01% to 0.08%; preferably, the dilution treatment comprises primary dilution and secondary dilution, the mass concentration of the slurry after the primary dilution is 0.2-0.4%, and the mass concentration of the slurry after the secondary dilution is 0.02-0.03%.
5. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 4, characterized in that: in step S1, before the primary dilution, a dispersant and a defoaming agent are added into the slurry, wherein the dosage of the dispersant is 0.03-0.06% of the mass of the slurry, and the dosage of the defoaming agent is 0.1-0.3% of the mass of the slurry; after the secondary dilution, a retention aid is also added, and the using amount of the retention aid is 0.8-2.0% of the mass of the slurry after the secondary dilution; preferably, the dispersing agent is polyethylene oxide, the defoaming agent is a polyether defoaming agent, and the retention aid is polyethylene oxide.
6. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in step S1, the melting point of the low-melting-point binding fiber is 230-250 ℃, and the softening point is 100-230 ℃; preferably, the melting point of the low-melting-point bonding fiber is 230 ℃, and the softening point of the low-melting-point bonding fiber is 180-200 ℃.
7. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in the step S1, the titer of the polyester fiber is 0.5-1.5D, and the length is 2-8 mm; the titer of the low-melting-point bonding fiber is 1.2-2D, and the length of the low-melting-point bonding fiber is 3-6 mm.
8. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in step S1, the mass ratio of the polyester fiber to the low-melting-point binder fiber is (50-70): (30-50).
9. The method for producing a nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: in step S3, the hot-pressing treatment includes a primary hot-pressing treatment and a secondary hot-pressing treatment which are performed in sequence; the temperature of the compression roller of the primary hot-pressing treatment is 140-230 ℃, and the thickness of the non-woven fabric after the primary hot-pressing treatment is 0.14-0.16 mm; the temperature of the compression roller of the secondary hot-pressing treatment is 160-220 ℃, and the thickness of the non-woven fabric after the secondary hot-pressing treatment is 0.09-0.12 mm.
10. The nonwoven fabric for photovoltaic table paper according to claim 1, characterized in that: the photovoltaic table paper nonwoven fabric is produced by the production method according to any one of claims 1 to 9.
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| JPH10264546A (en) * | 1997-03-27 | 1998-10-06 | Kuraray Co Ltd | Base paper for screen printing |
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| US20110293851A1 (en) * | 2009-02-02 | 2011-12-01 | Bollstroem Roger | Method for creating a substrate for printed or coated functionality, substrate, functional device and its use |
| US20200305278A1 (en) * | 2017-10-04 | 2020-09-24 | Institut Polytechnique De Grenoble | Process for manufacturing a functional flexible cellulosic substrate, setup for implementing said process |
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| JPH10264546A (en) * | 1997-03-27 | 1998-10-06 | Kuraray Co Ltd | Base paper for screen printing |
| JPH1158651A (en) * | 1997-08-28 | 1999-03-02 | Toray Ind Inc | Thermal screen printing stencil paper and its production |
| JP2000118162A (en) * | 1998-10-19 | 2000-04-25 | Toray Ind Inc | Unwoven fabric for heat sensitive stencil printing original paper |
| US20110293851A1 (en) * | 2009-02-02 | 2011-12-01 | Bollstroem Roger | Method for creating a substrate for printed or coated functionality, substrate, functional device and its use |
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| US20200305278A1 (en) * | 2017-10-04 | 2020-09-24 | Institut Polytechnique De Grenoble | Process for manufacturing a functional flexible cellulosic substrate, setup for implementing said process |
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