CN101555672A - Food wrapper and manufacturing method thereof - Google Patents
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- CN101555672A CN101555672A CNA2009100434334A CN200910043433A CN101555672A CN 101555672 A CN101555672 A CN 101555672A CN A2009100434334 A CNA2009100434334 A CN A2009100434334A CN 200910043433 A CN200910043433 A CN 200910043433A CN 101555672 A CN101555672 A CN 101555672A
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Abstract
The invention relates to a food wrapper and a manufacturing method thereof. Burst index of the food wrapper is not lower than 3kPa.m<2>/g, longitudinal tensile strength thereof is not lower than 3.0KN/m, lead content thereof is not higher than 5.0mg/kg and arsenic content is not higher than 1.0mg/kg; decoloring testing proves negative; fluorescent matter is not contained; pathogen can not be detected; whiteness of the wrapper ranges from 20% to 30%; the wrapper is brown; the manufacturing method comprises the following steps: DDS displacement cooking, washing screen, oxygen delignification and hydrogen peroxide bleaching are carried out on wood fibrous material to be prepared into micro-bleach pulp with a whiteness of 22% to 36%; beating, desanding, flovoring, fine sizing by a pressurized screen, wiring and moulding, pressing, drying, reeling, rewinding and packaging are carried out on the pulp, thus obtaining the food wrapper.
Description
Technical field
The present invention relates to a kind of package paper, this paper has higher physical strength, color is a health demand brown, that meet food wrapper.The invention still further relates to the production method of this food wrapper, especially utilize pin, wealthy wood fiber raw material, adopt the technology of DDS displacement cooking, oxygen delignification, hydrogen peroxide bleaching explained hereafter food wrapper.The invention still further relates to the application of this food wrapper.
Background technology
For a long time, plastic products are used in packaging for foodstuff in a large number, since the extremely difficult natural degradation of plastics, the plastic garbage intractable, food uses plastics package in a large number, easily causes the wasting of resources and environmental pollution, and food-packaging bag is the main source of present " white pollution ".Therefore; developed country launches respectively the plastics packed use of regulation limitations, and in order to protect environment, to economize on resources, China was from June 1st, 2008; forbid producing, selling and uying the super-thin plastic shopping bag, rules such as implementation plastic shopping bag paid utilization system limit the use of plastic shopping bag.Food wrapper is mainly used in the substitute of food plastic packing; develop biodegradable food wrapper substituted for plastic packing; help preserving the ecological environment; promote comprehensive utilization of resources; become the theme of packaging industry development today; help advancing energy-saving and emission-reduction work, reduce " white pollution ", preserve the ecological environment.In the food wrapper production process, the part paper uses chlorine-containing bleaching to produce high whiteness chemical pulp, adds fluorescent whitening agent etc. to human body and the harmful chemicals of environment in joining the process of copying.
The applicant applied for the patent of invention of title " method for producing Chinese red pine chemical pulp ", and application number is 200710035263.6, and the applying date is on June 26th, 2007, and this patent application document has been introduced a kind of masson pine DDS displacement cooking method.
The applicant also applied for the patent of invention of title " a kind of production of stretched paper bag ", and application number is 2007100349737, and the applying date is on May 17th, 2007, and this patent application document has been introduced a kind of production of stretched paper bag.
Chinese patent application numbers 200410050681.9 discloses a kind of method of utilizing cornstalk to make total chlorine free bleaching pulp production food wrapper and cultural paper on March 30th, 2005.With cornstalk or to remove the marrow cornstalk be raw material, through cut-out, dedusting, preimpregnation, boiling, bleaching.Digestant is based on ammonium sulfite and potassium sulfite or sodium sulfite, and sulphur or sulphur urine are auxiliary agent, and urea and NaOH are buffer.That bleaching process is strengthened with oxygen and alkali, with urea or sulphur urine protection fiber and activate two sections or multistage bleaching of hydrogen peroxide.Produce cornstalk or remove marrow cornstalk paper pulp completely without chlorine process, production and food, direct or indirect total chlorine free bleaching food wrapper and cardboard, cultural paper and the cardboard that contacts of human body.Product does not contain organic chloride, and as hypertoxic dioxin carcinogen, bleaching waste liquor not chloride ion-containing can enter alkali recovery, waste water reusable edible.Yet, because of cornstalk is a grass as raw material, this method digestant is an ammonium sulfite etc., digestion time is long, the energy consumption height is difficult to solve problem of environmental pollution in pulping process, become the paper physical strength also lower, has limited the range of application of product.
Summary of the invention
Technical problem to be solved by this invention is that a kind of cleaning pulping paper method that has low energy consumption, low pollution, paper physical intensity height, environmental friendliness, helps comprehensive utilization of resources is provided on the aforementioned techniques basis, the food wrapper that obtains with its production method has higher-strength, meets the packaging for foodstuff hygienic requirements.
In order to solve the problems of the technologies described above, the invention provides the raw materials for production and the production technology of food product wrapping paper are improved, the product of production reaches following technical indicator: burst index is not less than 3kPam
2/ g, machine direction tensile strength 〉=3.0KN/m, lead content≤5.0mg/kg, arsenic content≤1.0mg/kg, Decolorant Test is negative, does not contain fluorescent substance, can not detect and contain salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus, paper color is brown, whiteness 20～33% (ISO), form and aspect: L value 63～75, a value 3.5～7.5, b value 21～27.
In order to obtain above-mentioned packaging for foodstuff paper product, production method of the present invention comprises following content: wood fiber raw material, adopt the DDS displacement cooking, sieve is washed in sealing, oxonium base delignification, the little wood pulp that floats of hydrogen peroxide bleaching explained hereafter, float the disposed slurry whiteness at 22%～36% (ISO), paper with 100% primary wood pulp through joining slurry, be to pull an oar under 2.5%～4.5% the condition at slurry concentration, beating degree is 26～32 ° of SR, weight in wet base is 10.5～15g, and the making beating disposed slurry is through desanding, fine screen, wet end dehydration moulding, squeezing, preceding dry, the back is dry, batch, packing forms food wrapper.
As the improvement project one of the said goods, the food wrapper burst index is not less than 4.0kPam
2/ g, machine direction tensile strength is not less than 3.6KN/m, lead content≤2.0mg/kg, arsenic content≤0.6mg/kg, paper color is brown, whiteness 24～28% (ISO), form and aspect: L value 65～72, a value 4.0～7.0, b value 21.5～26, and satisfy other requirement of basic product simultaneously.
As the improvement project two of the said goods, food wrapper longitudinal tear degree index is not less than 10mN.m
2/ g, longitudinal tensile strain rate are not less than 6%, and satisfy other requirement of basic product simultaneously.
As the improvement project one of above-mentioned production decision, in basic production method, the production wood fiber raw material of food wrapper is not less than 70% masson pine, 30% with interior hardwood raw material for using.
Improvement project two as above-mentioned production decision, in basic production method, page through the compression of stretching property device, can further improve the physical strength of page when producing food wrapper in dry run, after the special raising longitudinal stretching rate, the paper tensile property is improved.
The food wrapper that the foregoing description is produced can be directly used in food or other class material packing; Also can after filtering film, produce leaching membrane paper, further improve its performance, be used for packaging for foodstuff or other class material packing.
Since adopt DDS displacement cooking, sealing wash sieve, oxonium base delignification, hydrogen peroxide bleaching, in dense technology, reduced the energy consumption in the pulping process, (AOX) reaches the purpose of cleaner production with the generation of dioxin noxious material to have reduced discharged waste water and organohalogen compounds; Because of adopting the cold boiling technology that spurts of DDS, oxonium base delignification, hydrogen peroxide bleaching is produced little wood pulp that floats, the Kappa number and the paper pulp yield of slurry have been improved, reduced in the production process damage to fiber, improved the intensity of chemical pulp, adopt specific beating process and page is vertically compressed processing with stretching property device, improved the physical strength of paper, under the prerequisite that keeps product high strength to require, can mix the leaf wood paper pulp of more staple fibres, enlarge the use amount and the fibrous raw material source of broadleaf, especially can utilize relatively poor wood machining residues of wood fibre and small dimension wood raw material, can economize on resources, reduce production costs, by improving the intensity of page, enlarge the scope of application of paper.
The specific embodiment:
Embodiment 1:
Masson pine with 70%, all the other are multiple leaf wood composite material fibrous raw material, after getting the raw materials ready, adopt the DDS displacement cooking, the chemical true qualities wood pulp that sieve series becomes Kappa number 46-56 is washed in sealing, slurry is through the oxonium base delignification, behind the hydrogen peroxide bleaching, pulp brightness is at 22% (ISO), this slurry preparation is become concentration 3.4%, with slurry pulping to 26 ° SR, weight in wet base 12g, slurry is desanding after diluting, control online concentration 0.2%, online pH value: 6.5, through the pressurized screen fine screen, with food-grade gum rosin and aluminum sulfate condiment, the long mesh paper making machine moulding, squeezing, dry, batch, rewinding, be packaged into finished product.
Oxygen delignification hydrogen peroxide bleaching technology is 60 minutes oxygen delignification section time, slurry concentration 8%, 80 ℃ of temperature, oxygen pressure 1200Kpa, pH value 10, air dried pulp flow of oxygen 20kg per ton, sodium hydroxide concentration 20kg; 60 minutes bleachery slurry time of staying, slurry concentration 8%, 60 ℃ of temperature, adjust pH value to 10.5, air dried pulp hydrogen peroxide consumption 5kg per ton with NaOH.
After tested, gained food wrapper moisture content 7.8%, whiteness 20.5% (ISO), form and aspect: 1 value 63, a value 3.6, b value 22 quantitatively are 64.8g/m
2, bursting strength 245kPa, machine direction tensile strength 4.1kN/m, lead content 0.30mg/kg, arsenic content＜0.2mg/kg.Decolorant Test is negative, does not detect fluorescent substance and salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus pathogenic bacteria.
Embodiment 2:
Masson pine with 85%, all the other are multiple leaf wood composite material fibrous raw material, after getting the raw materials ready, adopt the DDS displacement cooking, the chemical true qualities wood pulp that sieve series becomes Kappa number 50 is washed in sealing, slurry is through the oxonium base delignification, hydrogen peroxide bleaching disposed slurry whiteness is at 28% (ISO), this slurry key is made into concentration 3.0%, with slurry pulping to 29 ° SR, weight in wet base 12.3g, slurry is desanding after diluting, control online concentration 0.22%, online pH value: 6.1, through the pressurized screen fine screen, with food-grade gum rosin and aluminum sulfate condiment, the long mesh paper making machine moulding, squeezing, dry, batch, rewinding, be packaged into finished product.
Oxygen delignification hydrogen peroxide chlorine-free bleaching technology is 80 minutes oxygen delignification section time, slurry concentration 10%, 95 ℃ of temperature, oxygen pressure 820Kpa, pH value 10.5, air dried pulp flow of oxygen 28kg per ton, sodium hydroxide concentration 22kg; 85 minutes bleachery technical data time, slurry concentration 11%, 70 ℃ of temperature, adjust pH value 10.6, air dried pulp hydrogen peroxide consumption 25kg per ton with NaOH.
After tested, the brown food wrapper moisture content 8% of gained, whiteness 25.5% (ISO), form and aspect: l value 70, a value 5, b value 23 quantitatively are 70g/m
2, bursting strength 285kPa, machine direction tensile strength 3.9kN/m, lead content 0.35mg/kg, arsenic content＜0.2mg/kg.Decolorant Test is negative, does not detect fluorescent substance and salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus pathogenic bacteria.
Embodiment 3:
With masson pine timber fibrous raw material, after getting the raw materials ready, adopt DDS displacement cooking, sealing to wash the chemical true qualities wood pulp that sieve series becomes Kappa number 35, slurry through oxonium base delignification, hydrogen peroxide bleaching disposed slurry whiteness at 35% (ISO), with this slurry preparation become concentration 3.6%, with slurry pulping to 32 ° SR, weight in wet base 13g, slurry is desanding after diluting, control online concentration 0.2%, online pH value: 6, through the pressurized screen fine screen, with food-grade gum rosin and aluminum sulfate condiment, long mesh paper making machine moulding, squeezing, drying, batch, rewinding, be packaged into finished product.
Oxygen delignification hydrogen peroxide chlorine-free bleaching technology is 90 minutes oxygen delignification section time, slurry concentration 12%, 100 ℃ of temperature, oxygen pressure 1050Kpa, pH value 11.5, air dried pulp flow of oxygen 30kg per ton, sodium hydroxide concentration 30kg; 90 minutes bleachery technical data time, slurry concentration 11%, 85 ℃ of temperature, adjust pH value 10.6, air dried pulp hydrogen peroxide consumption 28kg per ton with NaOH.
After tested, gained food wrapper moisture content 9%, whiteness 33% (ISO), form and aspect: 1 value 74, a value 7, b value 22 quantitatively are 70g/m
2, bursting strength 308kPa, machine direction tensile strength 4.4kN/m, lead content 0.36mg/kg, arsenic content 0.3mg/kg.Decolorant Test is negative, does not detect fluorescent substance and salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus pathogenic bacteria.
Embodiment 4:
Masson pine with 75%, all the other are multiple leaf wood composite material fibrous raw material, after getting the raw materials ready, adopt the DDS displacement cooking, the chemical true qualities wood pulp that sieve series becomes Kappa number 48 is washed in sealing, slurry is through the oxonium base delignification, hydrogen peroxide bleaching disposed slurry whiteness is at 25% (ISO), with this slurry preparation form slurry concentration 3.4%, with slurry pulping to 26 ° SR, weight in wet base 12g, slurry is desanding after diluting, control online concentration 0.2%, online pH value 6.5 is through the pressurized screen fine screen, with food-grade gum rosin and aluminum sulfate condiment, the long mesh paper making machine moulding, squeezing, preceding dry, the compression of stretching property device, batch, rewinding, be packaged into finished product.
Oxygen delignification hydrogen peroxide chlorine-free bleaching technology is 60 minutes oxygen delignification section time, slurry concentration 8%, 80 ℃ of temperature, oxygen pressure 1120Kpa, pH value 10, air dried pulp flow of oxygen 20kg per ton, sodium hydroxide concentration 20kg; 60 minutes bleachery slurry time of staying, slurry concentration 8%, 60 ℃ of temperature, adjust pH value to 10.5, air dried pulp hydrogen peroxide consumption 5kg per ton with NaOH.92 ℃ of stretching property device stretching property of when compression cylinder surfaces temperature, advance stretching property cylinder page moisture 33%, page is 4% at stretching property cylinder compression ratio.
After tested, gained food wrapper moisture content 9%, whiteness 23.5% (ISO), form and aspect: 1 value 66, a value 3.8, b value 22 quantitatively are 75g/m2, bursting strength 345kPa, machine direction tensile strength 3.8kN/m, longitudinal tear degree index 11mN.m
2/ g, longitudinal tensile strain rate 6%, lead content 0.30mg/kg, arsenic content＜0.2mg/kg.Decolorant Test is negative, does not detect fluorescent substance and salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus pathogenic bacteria.
Embodiment 5:
Masson pine with 90%, all the other are multiple leaf wood composite material fibrous raw material, after getting the raw materials ready, adopt the DDS displacement cooking, the chemical true qualities wood pulp that sieve series becomes Kappa number 50 is washed in sealing, slurry is through the oxonium base delignification, hydrogen peroxide bleaching disposed slurry whiteness is at 27% (ISO), with this slurry preparation form slurry concentration 4.5%, with slurry pulping to 28 ° SR, weight in wet base 14.5g, slurry is desanding after diluting, control online concentration 0.2%, the online pH value: 5.9, through the pressurized screen fine screen, with food-grade gum rosin and aluminum sulfate condiment, the long mesh paper making machine moulding, squeezing, preceding dry, the compression of stretching property device, batch, rewinding, be packaged into finished product.
Oxygen delignification hydrogen peroxide chlorine-free bleaching technology is 85 minutes oxygen delignification section time, slurry concentration 10.5%, 95 ℃ of temperature, oxygen pressure 810Kpa, pH value 10.5, air dried pulp flow of oxygen 22kg per ton, sodium hydroxide concentration 21kg; 84 minutes bleachery slurry time of staying, slurry concentration 10%, 70 ℃ of temperature, adjust pH value to 11, air dried pulp hydrogen peroxide consumption 15kg per ton with NaOH.102 ℃ of stretching property device stretching property of when compression cylinder surfaces temperature, advance stretching property cylinder page moisture 35%, page is 7% at stretching property cylinder compression ratio.
After tested, gained food wrapper moisture content 10%, whiteness 25.5% (ISO), form and aspect: l value 69, a value 6.8, b value 25 quantitatively are 68g/m2, bursting strength 305kPa, machine direction tensile strength 3.6kN/m, longitudinal tear degree index 10.5mN.m
2/ g, longitudinal tensile strain rate 7%, lead content 0.35mg/kg, arsenic content 0.3mg/kg.Decolorant Test is negative, does not detect fluorescent substance and salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus pathogenic bacteria.
Embodiment 6:
With masson pine timber fibrous raw material, after getting the raw materials ready, adopt the DDS displacement cooking, the chemical true qualities wood pulp that sieve series becomes Kappa number 47 is washed in sealing, slurry is through the oxonium base delignification, hydrogen peroxide bleaching disposed slurry whiteness is at 32% (ISO), with gained slurry preparation form slurry concentration 4.2%, with slurry pulping to 32 ° SR, weight in wet base 15g, slurry is desanding after diluting, control online concentration 0.2%, the online pH value: 6, through the pressurized screen fine screen, with food-grade gum rosin and aluminum sulfate condiment, the long mesh paper making machine moulding, squeezing, preceding dry, the compression of stretching property device, batch, rewinding, be packaged into finished product.
Oxygen delignification hydrogen peroxide chlorine-free bleaching technology is 90 minutes oxygen delignification section time, slurry concentration 12%, 100 ℃ of temperature, oxygen pressure 850Kpa, pH value 12, air dried pulp flow of oxygen 30kg per ton, sodium hydroxide concentration 34kg; 90 minutes bleachery slurry time of staying, slurry concentration 10%, 65 ℃ of temperature, adjust pH value to 11, air dried pulp hydrogen peroxide consumption 30kg per ton with NaOH.115 ℃ of stretching property device stretching property of when compression cylinder surfaces temperature, advance stretching property cylinder page moisture 38%, page is 8% at stretching property cylinder compression ratio.
After tested, gained food wrapper moisture content 10%, whiteness 30% (ISO), form and aspect: l value 75, a value 7, b value 27 quantitatively are 80g/m2, bursting strength 378kPa, fracture length 7.32Km, longitudinal tear degree index 12mN.m
2/ g, longitudinal tensile strain rate 8%, lead content 0.26mg/kg, arsenic content＜0.2mg/kg.Decolorant Test is negative, does not detect fluorescent substance and salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus pathogenic bacteria.
Certainly, also can in connotation of the present invention, change process conditions, obtain the close product of performance, have same effect, also belong to the scope that the present invention asks for protection, so do not repeat.
The burst index of aforementioned food wrapper, tensile strength, percentage elongation, paper whiteness, form and aspect, lead content, arsenic content, Decolorant Test, fluorescent substance content, salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus content all detect by pulping and paper-making industry concerned countries, portion or industry standard, are known technology.
Claims (9)
1. a food wrapper is characterized in that: burst index 〉=3kPa.m
2/ g, machine direction tensile strength 〉=3.0kN/m, lead content≤5.0mg/kg, arsenic content≤1.0mg/kg, Decolorant Test is negative, does not contain fluorescent substance, can not detect and contain salmonella, Shigella, staphylococcus aureus and hemolytic streptococcus, paper color is brown, whiteness 20%～33%, form and aspect: L value 63～75, a value 3.5～7.5, b value 21～27.
2. food wrapper according to claim 1 is characterized in that: burst index 〉=4.0kPa.m
2/ g, lead content≤2.0mg/kg, arsenic content≤0.6mg/kg, paper whiteness 24%～28%, form and aspect: L value 65～72, a value 4.0～7.0, b value 21.5～26.
3. food wrapper according to claim 1 and 2 is characterized in that: machine direction tensile strength 〉=3.6kN/m, longitudinal tensile strain rate 〉=6%.
4. the application of food wrapper according to claim 1 and 2 is characterized in that: product is used for packaging for foodstuff through drenching after film is handled.
5. production method of making claim 1 or 2 described food wrappers, wood fiber raw material passes through boiling, washes sieve, bleaches and make slurry, slurry through making beating, desanding, condiment, pressurized screen fine screen, go up net forming, squeezing, drying, batch, rewinding, packing form, it is characterized in that: adopt DDS displacement cooking, oxonium base delignification, the little wood pulp that floats of hydrogen peroxide bleaching explained hereafter, float disposed slurry whiteness 22%～36%, beating consistency 2.5%～4.5%, 26～32 ° of SR of beating degree, weight in wet base: 10.5～15g.
6. the production method of food wrapper according to claim 5 is characterized in that: wood fiber raw material is not less than 70% masson pine, 30% with interior hardwood raw material for using.
7. the production method of food wrapper according to claim 5 is characterized in that: 60～90 minutes oxygen delignification section time, slurry concentration 8%～12%, 80～100 ℃ of temperature, oxygen pressure 800～1200Kpa, pH value 10～12, air dried pulp flow of oxygen 20～30kg per ton, sodium hydroxide concentration 20～35kg; 60～90 minutes hydrogen peroxide bleaching time, slurry concentration 8%～12%, 60～85 ℃ of temperature, adjust pH value 10.5～11, air dried pulp hydrogen peroxide consumption 5～30kg per ton with NaOH.
8. the production method of food wrapper according to claim 5, it is characterized in that: page in dry run through stretching property device compression, 90～115 ℃ of stretching property cylinder surfaces temperature during compression, advance stretching property cylinder page moisture 32%～38%, page is 4%～8% at stretching property cylinder compression ratio.
9. the production method of food wrapper according to claim 5 is characterized in that: adopt food-grade gum rosin and aluminum sulfate applying glue in the condiment process.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914861A (en) * | 2010-07-23 | 2010-12-15 | 福建省建宁县联丰造纸有限公司 | Method for producing milk facial tissue |
| CN102268845A (en) * | 2011-07-27 | 2011-12-07 | 岳阳林纸股份有限公司 | Food packing paper and production method thereof |
| CN102505572A (en) * | 2011-11-03 | 2012-06-20 | 岳阳林纸股份有限公司 | Method for producing noodle packing paper |
| CN108179647A (en) * | 2018-02-27 | 2018-06-19 | 日照华泰纸业有限公司 | A kind of micro- drift softwood pulp preparation method of no chlorine |
| CN108755258A (en) * | 2018-06-15 | 2018-11-06 | 台州市玫瑰纸业股份有限公司 | A kind of abrasive base paper and preparation method thereof |
| CN109853299A (en) * | 2019-03-11 | 2019-06-07 | 南京林业大学 | Low basis weight food wrapper and its production method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295396C (en) * | 2004-10-26 | 2007-01-17 | 田新 | Method for fabrication food wrap paper and cultural paper by using corn stalk to make no chlorin bleached pulp |
| CN101148847B (en) * | 2006-09-19 | 2012-06-27 | 珠海经济特区红塔仁恒纸业有限公司 | Liquid and food packing paper and method for producing the same |
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2009
- 2009-05-18 CN CN2009100434334A patent/CN101555672B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914861A (en) * | 2010-07-23 | 2010-12-15 | 福建省建宁县联丰造纸有限公司 | Method for producing milk facial tissue |
| CN101914861B (en) * | 2010-07-23 | 2012-11-14 | 福建省建宁县联丰造纸有限公司 | Method for producing milk facial tissue |
| CN102268845A (en) * | 2011-07-27 | 2011-12-07 | 岳阳林纸股份有限公司 | Food packing paper and production method thereof |
| CN102505572A (en) * | 2011-11-03 | 2012-06-20 | 岳阳林纸股份有限公司 | Method for producing noodle packing paper |
| CN108179647A (en) * | 2018-02-27 | 2018-06-19 | 日照华泰纸业有限公司 | A kind of micro- drift softwood pulp preparation method of no chlorine |
| CN108755258A (en) * | 2018-06-15 | 2018-11-06 | 台州市玫瑰纸业股份有限公司 | A kind of abrasive base paper and preparation method thereof |
| CN109853299A (en) * | 2019-03-11 | 2019-06-07 | 南京林业大学 | Low basis weight food wrapper and its production method |
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| CN101555672B (en) | 2010-11-03 |
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