CN107663805B - Aseptic hand towel and production process thereof - Google Patents
Aseptic hand towel and production process thereof Download PDFInfo
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- CN107663805B CN107663805B CN201710944032.0A CN201710944032A CN107663805B CN 107663805 B CN107663805 B CN 107663805B CN 201710944032 A CN201710944032 A CN 201710944032A CN 107663805 B CN107663805 B CN 107663805B
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- 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
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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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Abstract
The invention discloses a sterile paper towel and a production process thereof, belonging to the technical field of paper towel production, wherein the paper towel is processed by the following raw materials by weight percent: 20-60% of bleached sulfate softwood pulp, 30-70% of CPMP and 0-10% of broke pulp. The invention adopts proper principle proportion, low-organochlorine wet strength agent, degradable nontoxic bactericide and FDA-certified coating, adopts lower longitudinal and transverse tension ratio forming equipment, a drying and sterilizing process at the temperature higher than 400 ℃, safe and nontoxic chemicals and combines proper embossing process, and the produced paper towel has the characteristics of low quantification, low longitudinal and transverse tension ratio, sterility, environmental protection and high water absorption.
Description
Technical Field
The invention belongs to the technical field of paper processing, and particularly relates to sterile hand towel and a production process thereof.
Background
The paper towel is a disposable sanitary product in the paper for daily use, is also called paper towel, has a roll shape, also has a two-fold folding structure, but at present, more paper towels are three-fold, are mainly used for wiping hands in toilets of public places such as hotels, guesthouses, office buildings, airports, operas houses, convention places and the like, and are certainly suitable for families; the paper towel can be used for wiping one hand and two hands without waiting, so that the paper towel is soft and comfortable, does not leave dust on the hands after being used, gradually replaces an electric hand drier in a washroom, and is popular with wide guests from five-star hotels more than ten years ago to the current urban coffee houses.
The Chinese tissue market accounts for 95 percent of personal consumption, the commercial market accounts for only 5 percent, the tissue is positioned in the commercial market for more than ten years and is not widely related to the household market, so that the tissue is not like handkerchief paper, napkin paper and toilet roll paper to personal consumer groups at present, the tissue is completely close to family life, people are often used to wipe hands with cotton towels after washing hands, and even most consumers do not know the tissue with the erasable hands, and do not know other purposes of the tissue; in fact, the price of the paper towel is lower than that of the common paper towel on a supermarket shelf in single piece according to the current selling price in the commercial market; paper towels are not a luxury item nor do they present the high consumer problems of the product.
The production of domestic toilet paper starts late, the starting point is low, the production quantity is small, the sale range is narrow, nearly 50% of products can not be really qualified toilet paper until now, the standard of high-quantitative crepe toilet paper is continuously used since a factory in Hebei Shizhuang produces the first toilet paper in the middle of the last 80 th century in China, the toilet paper needs certain physical indexes in processing and use, the required product characteristics can not be completely reflected by blind production, the models are mixed, the process is different, the quality is always different, and even the international standard is not met. The existing hand towel has higher quantitative rate, and the quantitative range is 30-45g/m2And the production of the prior paper towel is all produced on a cylinder mould or a short and long net paper machine, the paper machine has low efficiency and high energy consumption, and products produced by the cylinder mould or the short and long net paper machine generally have larger longitudinal and transverse tension because of the limitation of a flow box and the speed of the paper machine, so in order to meet the transverse tension, higher pulping power consumption, dry strength agent and more wet strength agent are often used to meet the tension requirement. And the existing paper towel has the problems of more bacteria and fungi.
Disclosure of Invention
The invention mainly solves the technical problem of providing the sterile paper towel which has the characteristics of low ration, low longitudinal and transverse tension ratio, sterility, environmental protection and high water absorption.
The invention also provides a production process of the sterile hand towel, and the hand towel prepared by adopting the proper production process and comprehensively controlling various conditions has the characteristics of low quantification, low longitudinal and transverse tension ratio, sterility, strong hygroscopicity and high wet strength.
In order to solve the technical problems, the invention adopts the following technical scheme:
the sterile paper towel is processed from the following raw materials in percentage by weight: 20-60% of bleached sulfate softwood pulp, 30-70% of CPMP and 0-10% of broke pulp.
Preferably, the paper towel is processed by the following raw materials in percentage by weight: bleached kraft softwood pulp 40%, CPMP 55% and broke 5%.
Specifically, the quantitative amount of the hand towel is not more than 26g/m2' preferably, the basis weight of the paper towel is 20.5. + -. 0.8g/m2。
The production process of the sterile paper towel comprises the following steps:
(1) separately disintegrating and pulping the raw materials of softwood pulp and CPMP for producing the hand towel, wherein the softwood pulp is pulped by three disc mills, and the CPMP pulp is defibered by a single defibering machine;
(2) adding a bactericide: the addition amount of the bactericide Spectrum XD3899 is 0.1-0.5kg/t, the addition points are three, and a white water chute, a white water tower and a recycling pulp tank are conveyed to the whole papermaking system through the circulation of a white water system;
(3) uniformly mixing the pulped softwood pulp, CPMP and the damaged paper pulp, and adding a chemical additive; the chemical additives added per ton of paper specifically include: 14-18 kg/t of wet strength agent and 0-8 kg/t of dry strength agent;
(4) adopting a crescent toilet paper machine to carry out paper making, wherein the specific conditions of the paper making are as follows: the speed is 800 m/min-1500 m/min, the wrinkling rate is 12.0 +/-4.0%, the vacuum degree of a vacuum roll is-20 to-45 kPa, the squeezing pressure of the vacuum roll is 90 +/-4 kN/m, and the pulp mesh speed ratio is 0.9 to 1.0;
(5) adjusting the pulp-screen speed ratio to 0.9-1.0, and controlling the longitudinal and transverse tension ratio of the paper within 1.4;
(6) and (3) forming a coating: diluting and mixing the cylinder sticking agent of 50-120ml/min and the cylinder removing agent of 20-50ml/min with clear water at 30-45 ℃, and spraying the mixture to a drying cylinder;
(7) squeezing: adopting a Valmet shoe press roll, and adopting a B area mode to press;
(8) and (3) drying: the drying cylinder and the high-speed hot air hood are adopted, the steam pressure of the drying cylinder is adjusted to be 4.0-6.5bar, and the drying load distribution of the high-speed hot air hood is adopted, so that the temperature of the natural gas reaches above 400 ℃, and spore bacteria and fungi are killed instantly.
Specifically, the process for disintegrating softwood pulp and CPMP comprises the following steps: adding 0-0.4 kg/t of pulping enzyme, 0.4-0.6 kg/t of resin control agent, 0-0.5 kg/t of sodium hydroxide, the pulping concentration is 5-6%, the pulping time is 6-10min, the beating degree of softwood pulp is 25-45 DEG SR, the beating degree of CPMP is 15-20 DEG SR, and the pulping processes are as follows: the beating concentration is 3-6%, the beating temperature is 25-55 ℃, and the pH value of the white water is 5-10.
Preferably, the wet strength agent is PAE, the pulping enzyme is Buzyme 2535, the dry strength agent is cationic PAM, the bactericide is Spectrum XD3899, the control agent is DC3970, the cylinder sticking agent is cylinder sticking agent 3718, and the cylinder removing agent is cylinder removing agent R150.
Preferably, the diameter of the drying cylinder is 4.5-5.8 m.
The hand towel prepared by the method has the longitudinal tensile strength of 24-26 N.m/g, the transverse tensile strength of 9.5-10.5 N.m/g, the longitudinal wet strength of more than or equal to 30N/m, the longitudinal elongation of more than or equal to 15% and the softness of more than or equal to 300mN/2 layers.
The invention has the beneficial effects that:
(1) the present invention adopts a single-layer hand wiping paper process at home, the internal porosity of the single-layer paper is low, and the transverse liquid absorption height is often less than 20mm/100 s.
(2) The bleached sulfate softwood pulp, the CPMP wood pulp and the broke pulp are matched, and the proper proportion is adopted, so that the bulk of the finished paper is higher, the paper has better absorption performance and elasticity, and the cost performance is higher in price.
(3) The invention adopts a crescent high toilet paper machine to make paper, and can obtain lower longitudinal and transverse tension ratio to avoid adding a dry strength agent and lower using amount of a wet strength agent. In the forming process of paper, the longitudinal tension is greater than the transverse tension due to the longitudinal arrangement of the fibers, so that in the use of the paper wipe, a cylinder paper machine or a short and long net paper machine can be obtained by meeting the requirement of the transverse tension due to the characteristics of a former, the speed of the vehicle is low, the longitudinal arrangement of the fibers is more, and therefore, in the forming process, the base paper with lower longitudinal and transverse tension ratio is difficult to obtain, the longitudinal and transverse tension ratio of the base paper is more than 1.8 than that of the common base paper, and therefore, in order to make up for the shortage of the transverse tension, only the beating degree is improved, and the using. In order to satisfy the wet tensile strength in the cross direction, a cylinder machine or a fourdrinier machine was used, and the wet strength agent was added in an amount of 30 to 50kg per ton of paper. The wet strength agent is thermosetting resin, a wet strength agent-fiber-wet strength agent water-resistant network structure can be formed in the drying process, and the liquid absorption speed and the liquid absorption amount can be further prevented by adding a large amount of the wet strength agent. And the crescent high-speed toilet paper machine can obtain lower longitudinal-transverse tension ratio, thereby meeting the tension requirement of the paper towel with lower beating degree. With the improvement of the beating degree, the hydrogen bond bonding and the fiber bonding force are increased, the tension of the paper towel is improved, but the size and the number of air holes in the paper are reduced, so that the liquid absorption performance of the paper is reduced. The crescent high-speed toilet paper machine can obtain lower longitudinal and transverse tension and can easily obtain higher transverse tension, thereby reducing the beating strength and improving the liquid absorption performance of paper.
(4) The production process of the paper towel is provided with a large-diameter drying cylinder (with the diameter of 4.5-5.8 m) and a high-speed hot air cover, the temperature of natural gas can reach more than 400 ℃ by adjusting the drying load distribution of steam of the drying cylinder and the high-speed hot air cover, and spore bacteria and fungi which can not be killed by a steam air cover of a common paper machine at 150 ℃ and 180 ℃ can be killed.
(5) The wet strength agent addition amount of the production process is 6-10 kg/ton paper, and the use amount is reduced by 60-80% compared with other production processes of hand towel paper. Meanwhile, the method avoids the problem that the residual wet strength agent causes poor biochemical effect and difficult treatment for wastewater treatment due to the large addition of the wet strength agent.
(6) The invention adopts the special bactericide for Spectrum XD3899, which is a weak oxidant, has better sterilization effect, less corrosion to equipment, no drug resistance, basically no influence on other chemicals, and no residual organic matter in degradable.
(7) The invention adopts the Valmet shoe press roll to replace a press roll, adopts a B area mode, has a large press roll nip, achieves the same dryness of the wet paper, has long press dewatering time, ensures dewatering, and can maximally keep the bulk, thereby ensuring the water absorption of the paper.
(8) The invention belongs to the technology of high-grade hand towel process development, fills the domestic blank in the aspect, and plays a positive demonstration role in reducing the energy consumption of the whole domestic paper industry.
Detailed Description
The present invention will be further explained below by way of specific examples, but it should be understood that the present invention may be embodied in various forms and should not be limited by the examples set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
Example 1
The sterile paper towel is processed from the following raw materials in percentage by weight: bleached kraft softwood pulp 20%, CPMP 70% and broke pulp 10%.
The production process of the sterile paper towel comprises the following steps:
(1) separately disintegrating and pulping the raw materials of softwood pulp and CPMP for producing the hand towel, wherein the softwood pulp is pulped by three disc mills, and the CPMP pulp is defibered by a single defibering machine;
(2) adding a bactericide: the addition amount of the bactericide Spectrum XD3899 is 0.1kg/t, the addition points are three, and a white water chute, a white water tower and a recycling pulp tank are sent to the whole papermaking system through the circulation of a white water system;
(3) uniformly mixing the pulped softwood pulp, CPMP and the damaged paper pulp, and adding a chemical additive; the chemical additives added per ton of paper specifically include: 14kg/t of wet strength agent and 4kg/t of dry strength agent;
(4) adopting a crescent toilet paper machine to carry out paper making, wherein the specific conditions of the paper making are as follows: the vehicle speed is 800m/min, the wrinkling rate is 12.0 percent, the vacuum degree of the vacuum roll is-20 kPa, the squeezing pressure of the vacuum roll is 90kN/m, and the pulp mesh speed ratio is 0.9;
(5) adjusting the pulp-screen speed ratio to be 0.9, and controlling the longitudinal and transverse tension ratio of the paper to be within 1.4;
(6) and (3) forming a coating: diluting and mixing a cylinder sticking agent of 50ml/min and a cylinder removing agent of 20ml/min by clear water at 30 ℃, and spraying the mixture to a drying cylinder;
(7) squeezing: adopting a Valmet shoe press roll, and adopting a B area mode to press;
(8) and (3) drying: a drying cylinder with the diameter of 4.5m and a high-speed hot air cover are adopted, the temperature of natural gas reaches above 400 ℃ by adjusting the steam pressure of the drying cylinder to be 4.0bar and the drying load distribution of the high-speed hot air cover, and spore bacteria and fungi are killed instantly.
Specifically, the process for disintegrating softwood pulp and CPMP comprises the following steps: 0.2kg/t of pulping enzyme, 0.4kg/t of resin control agent and 0.2kg/t of sodium hydroxide are added, the pulping concentration is 5 percent, the pulping time is 6min, the beating degree of softwood pulp is 25 degrees SR, the beating degree of CPMP is 15 degrees SR, and the pulping processes are both as follows: the beating concentration is 3%, the beating temperature is 25 ℃, and the white water pH is 5.
The wet strength agent is PAE, the pulping enzyme is Buzyme 2535, the dry strength agent is cationic PAM, the bactericide is Spectrum XD3899, the control agent is DC3970, the cylinder sticking agent is cylinder sticking agent 3718, and the cylinder removing agent is cylinder removing agent R150.
The paper towel prepared by the method is determined to have a quantitative of 20.1g/m2The longitudinal tensile strength is 24.2 Nm/g, the transverse tensile strength is 9.8 Nm/g, the longitudinal wet strength is more than or equal to 30N/m, the longitudinal elongation is more than or equal to 15 percent, and the softness is more than or equal to 300mN/2 layers, which all meet the standard.
Example 2
The sterile paper towel is processed from the following raw materials in percentage by weight: bleached kraft softwood pulp 60%, CPMP 30%% and broke pulp 10%.
The production process of the sterile paper towel comprises the following steps:
(1) separately disintegrating and pulping the raw materials of softwood pulp and CPMP for producing the hand towel, wherein the softwood pulp is pulped by three disc mills, and the CPMP pulp is defibered by a single defibering machine;
(2) adding a bactericide: the addition amount of the bactericide Spectrum XD3899 is 0.5kg/t, the addition points are three, and a white water chute, a white water tower and a recycling pulp tank are sent to the whole papermaking system through the circulation of a white water system;
(3) uniformly mixing the pulped softwood pulp, CPMP and the damaged paper pulp, and adding a chemical additive; the chemical additives added per ton of paper specifically include: 18kg/t of wet strength agent and 6kg/t of dry strength agent;
(4) adopting a crescent toilet paper machine to carry out paper making, wherein the specific conditions of the paper making are as follows: the vehicle speed is 1500m/min, the wrinkling rate is 16.0 percent, the vacuum degree of the vacuum roll is-45 kPa, the squeezing pressure of the vacuum roll is 94kN/m, and the pulp-screen speed ratio is 1.0;
(5) adjusting the pulp-screen speed ratio to be 1.0, and controlling the longitudinal and transverse tension ratio of the paper within 1.4;
(6) and (3) forming a coating: diluting and mixing 120ml/min of a cylinder sticking agent and 50ml/min of a cylinder removing agent with clear water at 45 ℃, and spraying the mixture to a drying cylinder;
(7) squeezing: adopting a Valmet shoe press roll, and adopting a B area mode to press;
(8) and (3) drying: a drying cylinder with the diameter of 5.8m and a high-speed hot air cover are adopted, the temperature of natural gas reaches above 400 ℃ by adjusting the steam pressure of the drying cylinder to be 6.5bar and the drying load distribution of the high-speed hot air cover, and spore bacteria and fungi are killed instantly.
Specifically, the process for disintegrating softwood pulp and CPMP comprises the following steps: 0.4kg/t of pulping enzyme, 0.6kg/t of resin control agent and 0.5kg/t of sodium hydroxide are added, the pulping concentration is 6 percent, the pulping time is 10min, the beating degree of softwood pulp is 245 DEG SR, the beating degree of CPMP is 20 DEG SR, and the pulping processes are both as follows: the pulping concentration is 6 percent, the pulping temperature is 55 ℃, and the pH value of white water is 10.
Preferably, the wet strength agent is PAE, the pulping enzyme is Buzyme 2535, the dry strength agent is cationic PAM, the bactericide is Spectrum XD3899, the control agent is DC3970, the cylinder sticking agent is cylinder sticking agent 3718, and the cylinder removing agent is cylinder removing agent R150.
The detection shows that the weight of the paper towel prepared by the method is 21.0g/m2A tensile strength in the machine direction of 26 N.m/g and a transverse directionThe tensile strength is 10.2 N.m/g, the longitudinal wet strength is more than or equal to 30N/m, the longitudinal elongation is more than or equal to 15 percent, and the softness is more than or equal to 300mN/2 layers.
Example 3
The sterile paper towel is processed from the following raw materials in percentage by weight: bleached kraft softwood pulp 40%, CPMP 55% and broke 5%.
The production process of the sterile paper towel comprises the following steps:
(1) separately disintegrating and pulping the raw materials of softwood pulp and CPMP for producing the hand towel, wherein the softwood pulp is pulped by three disc mills, and the CPMP pulp is defibered by a single defibering machine;
(2) adding a bactericide: the addition amount of the bactericide Spectrum XD3899 is 0.3kg/t, the addition points are three, and a white water chute, a white water tower and a recycling pulp tank are sent to the whole papermaking system through the circulation of a white water system;
(3) uniformly mixing the pulped softwood pulp, CPMP and the damaged paper pulp, and adding a chemical additive; the chemical additives added per ton of paper specifically include: 16kg/t of wet strength agent and 4kg/t of dry strength agent;
(4) adopting a crescent toilet paper machine to carry out paper making, wherein the specific conditions of the paper making are as follows: the vehicle speed is 1200m/min, the wrinkling rate is 12.0%, the vacuum degree of the vacuum roll is-30 kPa, the squeezing pressure of the vacuum roll is 90kN/m, and the pulp mesh speed ratio is 1.0;
(5) adjusting the pulp-screen speed ratio to be 1.0, and controlling the longitudinal and transverse tension ratio of the paper within 1.4;
(6) and (3) forming a coating: diluting and mixing a cylinder sticking agent of 100ml/min and a cylinder removing agent of 35ml/min with clear water at 40 ℃, and spraying the mixture to a drying cylinder;
(7) squeezing: adopting a Valmet shoe press roll, and adopting a B area mode to press;
(8) and (3) drying: a drying cylinder with the diameter of 5.0m and a high-speed hot air cover are adopted, the temperature of natural gas reaches above 400 ℃ by adjusting the steam pressure of the drying cylinder to be 5.0bar and the drying load distribution of the high-speed hot air cover, and spore bacteria and fungi are killed instantly.
Specifically, the process for disintegrating softwood pulp and CPMP comprises the following steps: 0.2kg/t of pulping enzyme, 0.5kg/t of resin control agent and 0.2kg/t of sodium hydroxide are added, the pulping concentration is 6 percent, the pulping time is 8min, the beating degree of softwood pulp is 35 DEG SR, the beating degree of CPMP is 18 DEG SR, and the pulping processes are both as follows: the beating concentration is 4%, the beating temperature is 40 ℃, and the white water pH is 7.
The wet strength agent is PAE, the pulping enzyme is Buzyme 2535, the dry strength agent is cationic PAM, the bactericide is Spectrum XD3899, the control agent is DC3970, the cylinder sticking agent is cylinder sticking agent 3718, and the cylinder removing agent is cylinder removing agent R150.
The detection shows that the quantitative amount of the paper towel prepared by the method is 20.8g/m2The longitudinal tensile strength is 24-26 Nm/g, the transverse tensile strength is 9.5-10.5 Nm/g, the longitudinal wet strength is more than or equal to 30N/m, the longitudinal elongation is more than or equal to 15%, and the softness is more than or equal to 300 mN/2.
And the inventor obtains the production process and technical parameters of the invention as shown in table 1 through a plurality of laboratory tests and pilot trials.
TABLE 1 technical indices of sterile paper towel
The hand towel produced by the process of the invention belongs to high-grade paper series, fills the domestic blank in the aspect, and plays an active demonstration role in reducing the energy consumption of the whole domestic paper industry.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The sterile paper towel is characterized in that the paper towel is processed by the following raw materials in percentage by weight: bleached kraft softwood pulp 40%, CPMP 55% and broke pulp 5%; the production process comprises the following steps:
(1) separately disintegrating and pulping the raw materials of softwood pulp and CPMP for producing the hand towel, wherein the softwood pulp is pulped by three disc mills, and the CPMP pulp is defibered by a single defibering machine;
(2) adding a bactericide: the addition amount of the bactericide Spectrum XD3899 is 0.1-0.5kg/t, the addition points are three, and a white water chute, a white water tower and a recycling pulp tank are conveyed to the whole papermaking system through the circulation of a white water system;
(3) uniformly mixing the pulped softwood pulp, CPMP and the damaged paper pulp, and adding a chemical additive; the chemical additives added per ton of paper specifically include: 14-18 kg/t of wet strength agent and 0-8 kg/t of dry strength agent;
(4) adopting a crescent toilet paper machine to carry out paper making, wherein the specific conditions of the paper making are as follows: the speed is 800 m/min-1500 m/min, the wrinkling rate is 12.0 +/-4.0%, the vacuum degree of a vacuum roll is-20 to-45 kPa, the squeezing pressure of the vacuum roll is 90 +/-4 kN/m, and the pulp mesh speed ratio is 0.9 to 1.0;
(5) adjusting the pulp-screen speed ratio to 0.9-1.0, and controlling the longitudinal and transverse tension ratio of the paper within 1.4;
(6) and (3) forming a coating: diluting and mixing the cylinder sticking agent of 50-120ml/min and the cylinder removing agent of 20-50ml/min with clear water at 30-45 ℃, and spraying the mixture to a drying cylinder;
(7) squeezing: adopting a Valmet shoe press roll, and adopting a B area mode to press;
(8) and (3) drying: the drying cylinder and the high-speed hot air hood are adopted, the steam pressure of the drying cylinder is adjusted to be 4.0-6.5bar, and the drying load distribution of the high-speed hot air hood is adopted, so that the temperature of the natural gas reaches above 400 ℃, and spore bacteria and fungi are killed instantly.
2. The sterile wipe of claim 1 wherein said wipe has a basis weight of no more than 26g/m2。
3. The sterile wipe of claim 2 wherein said wipe has a basis weight of 20.5 ± 0.8g/m2。
4. The sterile hand towel of claim 1, wherein the softwood pulp, CPMP, disintegration process comprises: adding 0-0.4 kg/t of pulping enzyme, 0.4-0.6 kg/t of resin control agent, 0-0.5 kg/t of sodium hydroxide, the pulping concentration is 5-6%, the pulping time is 6-10min, the beating degree of softwood pulp is 25-45 DEG SR, the beating degree of CPMP is 15-20 DEG SR, and the pulping processes are as follows: the beating concentration is 3-6%, the beating temperature is 25-55 ℃, and the pH value of the white water is 5-10.
5. The aseptic hand-towel of claim 1, wherein the drying cylinder has a diameter of 4.5 to 5.8 m.
6. The sterile paper towel according to claim 1, wherein the prepared paper towel has longitudinal tensile strength of 24-26N-m/g, transverse tensile strength of 9.5-10.5N-m/g, longitudinal wet strength of more than or equal to 30N/m, longitudinal elongation of more than or equal to 15%, and softness of more than or equal to 300mN/2 layers.
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| CN108999031B (en) * | 2018-09-11 | 2019-09-17 | 重庆龙璟纸业有限公司 | A kind of molten water roll paper and preparation method thereof |
| CN110876576A (en) * | 2019-11-27 | 2020-03-13 | 丹东恒耀纸业有限公司 | Production process of disposable embossed toilet seat paper |
| CN111364270A (en) * | 2020-03-23 | 2020-07-03 | 潍坊杰高非织材料科技有限公司 | Liquid absorbing material and pulping process thereof |
| CN114263067B (en) * | 2021-12-29 | 2023-01-10 | 福建恒安集团有限公司 | Preparation process of raw paper material of high-water-absorption hand towel paper |
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