WO2010066195A1 - 一种原纸以及制备方法和应用 - Google Patents

一种原纸以及制备方法和应用 Download PDF

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Publication number
WO2010066195A1
WO2010066195A1 PCT/CN2009/075431 CN2009075431W WO2010066195A1 WO 2010066195 A1 WO2010066195 A1 WO 2010066195A1 CN 2009075431 W CN2009075431 W CN 2009075431W WO 2010066195 A1 WO2010066195 A1 WO 2010066195A1
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WO
WIPO (PCT)
Prior art keywords
pulp
oxygen delignification
amount
cooking
slurry
Prior art date
Application number
PCT/CN2009/075431
Other languages
English (en)
French (fr)
Inventor
李洪法
宋明信
王建民
毕衍金
徐金香
何忠成
Original Assignee
山东福荫造纸环保科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CNU2008201808542U external-priority patent/CN201250368Y/zh
Priority claimed from CNU2008201808576U external-priority patent/CN201264421Y/zh
Priority claimed from CNU2008201808538U external-priority patent/CN201250367Y/zh
Priority claimed from CNU2008201808557U external-priority patent/CN201250366Y/zh
Priority claimed from CNU2008201808580U external-priority patent/CN201264422Y/zh
Application filed by 山东福荫造纸环保科技有限公司 filed Critical 山东福荫造纸环保科技有限公司
Priority to US13/143,809 priority Critical patent/US8771465B2/en
Priority to EP09831472.7A priority patent/EP2374930B1/en
Priority to CA2749168A priority patent/CA2749168C/en
Publication of WO2010066195A1 publication Critical patent/WO2010066195A1/zh

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • D21C3/14—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites ammonium bisulfite
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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
    • D21H27/10—Packing paper

Definitions

  • the invention relates to a base paper, which can be further processed into various processed papers.
  • they can be paper sheets of textbooks or can be written.
  • the base paper of the present invention is not added with other dyes, pigments or pigments.
  • the base paper is not bleached or only lightly bleached, and the obtained base paper itself can form a natural yellow color which is beneficial to vision. It can protect the eyes and prevent myopia.
  • 100% of the paper base of the present invention is used, the harm caused by chemicals such as dioxins can be avoided and the environmental protection can be positively affected.
  • the main object of the present invention is to provide a base paper
  • Another object of the present invention is to provide a method for preparing the base paper
  • Still another object of the invention is the use of the above-described base paper in paper products.
  • the mixed pulp of the base paper comprises straw pulp and other industrial pulp, wherein the weight ratio of the grass pulp in the mixed pulp is 10-100%, preferably 30-90%, more preferably 40-80%;
  • the woven pulp has a hardness of 10 _ 17 K Mn 0 4 , an average fiber length of 0. 1-2. 5 mm, a tensile index of 23_57 Nm / g, a tear index of 3. 0-6. OmN ⁇ mVg and a folding index 2_6 kPa ⁇ m 2 /g;
  • the whiteness of the grass pulp is 28-50%, preferably 30-45%, more preferably 25-43%.
  • the method of preparing the base paper comprises adding the grass raw material to the pot, adding the cooking liquid, heating the cooking liquid to a temperature of 100-200 ° C, and increasing the pressure to 0. 3-0. 9MPa, cooking time is 150-250 minutes,
  • the amount of ammonium sulfite is 5-20% of the amount of dry raw materials
  • the amount of sodium hydroxide is 0-15% of the amount of dry raw materials
  • the liquid ratio is 1: 2-15, and the obtained slurry is squeezed and washed. After the grass pulp is obtained.
  • the cooking material is added to the pot, and then the cooking liquid is added, and the cooking liquid is heated to 156-173 V, and the pressure is raised to 0.6-0.75 MPa, the cooking time is 180-220 minutes, and the cooking is performed.
  • the amount of ammonium sulfite is 9-15% of the amount of the dry raw material
  • the amount of sodium hydroxide is 0-8% of the amount of the dry raw material
  • the liquid ratio is 1:6-10, and the obtained slurry is squeezed. After the slurry is washed, the grass pulp is obtained.
  • the slurry obtained after the washing is further subjected to oxygen delignification, wherein the oxygen delignification comprises: feeding the slurry obtained after cooking or the washed slurry into an oxygen delignification reaction column, 2 MPa ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
  • the oxygen delignification process may also be added, wherein the oxygen delignification process comprises: 1) adjusting the concentration of the high-hardness pulp obtained after cooking; 2) pumping the slurry to the oxygen delignification reaction column, and adding sodium hydroxide and Oxygen; 3) the slurry is subjected to an oxygen delignification reaction in the oxygen delignification reaction column; the concentration of the high-hardness slurry obtained after the adjustment of the cooking means that the concentration of the slurry is adjusted to 8-18%;
  • the oxygen delignification is preferably a single stage oxygen delignification, carried out in an oxygen delignification reaction column.
  • the temperature of the slurry at the inlet of the reaction column is preferably 95-100 ° C, the pressure is preferably 0.9-1.2 MPa, and the temperature at the outlet is preferably 100-105 ° C.
  • the pressure is preferably 0. 2 - 0. 4Mpa; the amount of alkali used in the oxygen delignification is preferably 2-4% of the dry pulp amount based on sodium hydroxide, and the oxygen is preferably added per ton of pulp.
  • the reaction time of the slurry in the reaction tower is preferably 60-90 minutes; before the oxygen delignification treatment, the pulp is preferably conveyed and heated to 70 ° C and sent to a slurry tube; In the process of delignification, it is preferred to add 0.2 to 1% of magnesium salt as a protective agent.
  • the textbook made of the base paper of the present invention can form a yellow with a better vision environment without adding other dyes, pigments or color materials, thereby protecting the eyes and preventing myopia;
  • the product made of the base paper of the present invention may be free of dyes, pigments or pigments, and the straw is not bleached, thereby reducing the manufacturing cost.
  • the grass pulp described in this embodiment is a slurry obtained by a cooking, washing step, or a slurry obtained by a cooking, washing, and oxygen delignification step.
  • the cooking may be a conventional cooking method disclosed in the prior art, and includes an ammonium imide method, a caustic soda method, a caustic soda method, a sulfate method or an alkaline sodium-sodium method.
  • the invention preferably has the following method: adding the grass raw material to the pot, adding the cooking liquid, and heating the cooking liquid to the temperature
  • the pressure is increased to 0. 3-0. 9MPa
  • the cooking time is 150-250 minutes
  • the cooking agent wherein the amount of ammonium sulfite is 5-20% of the amount of the dry raw material
  • the amount of sodium hydroxide is 0-15% of the amount of the dry raw material
  • the liquid ratio is 1: 2-15
  • the grass material is added to the pot, and then the cooking liquid is added, the cooking liquid is heated to 156-173 ° C, and the pressure is raised to 0. 6-0. 75MPa, the cooking time is 180-220 minutes, the In the cooking agent, the amount of ammonium sulfite is 9-15% of the amount of the dry raw material, the amount of sodium hydroxide is 0-8% of the amount of the dry raw material, and the liquid ratio is 1: 6-10, and the obtained slurry is obtained. After the slurry is washed and washed, the grass pulp is obtained.
  • the slurry obtained after the above washing is further subjected to oxygen delignification to obtain a desired grass pulp.
  • the oxygen delignification comprises: feeding the slurry obtained after cooking or the washed slurry into an oxygen delignification reaction tower, wherein the temperature of the slurry at the inlet of the reaction tower is 90-100 ° C, pressure of 0. 9- L 2MPa; temperature at the outlet of 95- 105 ° C, a pressure of 0. 2- 0. 6MPa;
  • the oxygen delignification is carried out for 60-90 minutes under the condition that the amount of alkali is 2-4% by weight of sodium hydroxide and the amount of oxygen is 20-40 kg per ton of pulp, and grass is obtained. Pulp.
  • the hardness of the straw is 10_17: 104, mean fiber length of 0. 1-2 5mm, tensile index.
  • the grass pulp has a whiteness of 28 to 50%, preferably 30 to 45%, more preferably 25 to 43%.
  • the straw pulp according to the embodiment is made of any one or more of a combination material including wheat grass straw, straw straw, reed, arundo or cotton stalk. Preferred are wheat straw and straw.
  • the embodiment further relates to a mixed pulp which further contains other industrial pulps, and the other industrial pulps include one or a combination of two or more of bagasse pulp, wood pulp, cotton pulp, bamboo pulp or secondary fibers.
  • the secondary fiber is a pulp fiber reconstituted from recycled waste paper.
  • the weight ratio of the straw pulp in the mixed pulp is 10-100%, preferably 30-90%, more preferably 40-80%.
  • This embodiment is a straw according to the same and other embodiments 1, except that, in the present embodiment, the hardness of the resulting straw as 100% value 10_17KMn0 4, an average fiber length of 0. 1- 2. 5
  • the tensile index is 23-57 N. m/g
  • the tear index is 3. 0-6. 0 m ⁇ m 2 /g
  • the bursting index is
  • Base paper formed by 2-6 kPa ⁇ m7g of straw pulp.
  • the embodiment further relates to a mixed pulp for preparing an anti-myopia textbook base paper, wherein the page is a grass pulp-containing pulp having a whiteness of 40-76%, preferably 50 76%, more preferably 60. 76% of the paper layer, free of dyes, pigments or pigments. Further, the page is a sheet layer having an opacity of 70 100%, preferably 80 99 %, more preferably 85 95 %.
  • the present embodiment also relates to a book base paper prepared by using a mixed pulp, wherein the base paper is referred to herein as a book, and the mixed pulp forms a whiteness of 40-76%, preferably 50 76%, more preferably 60 76%.
  • the paper sheet layer is free of dyes, pigments or pigments.
  • the book sheet has an opacity of 70 100%, preferably 80 99%, more preferably 85 95%.
  • the preparation and performance of the writing paper are as follows: the straw raw material is added to the pot, and then the cooking liquid is added, the cooking liquid is heated to 165 ° C, and the temperature is raised to 0. 70 MPa, and the cooking time is 240 minutes.
  • the amount of ammonium sulfate is 15% of the amount of dry raw materials, the amount of sodium hydroxide is 5% of the amount of dry raw materials, and the liquid ratio is 1:8.
  • the obtained pulp is squeezed and washed to obtain grass pulp, and the straw is obtained.
  • the hardness is 16 KMn0 4 value, the tensile index is 28 Nm/g, the tear index is 3. 9 m ⁇ m7 g, the folding index is 3.
  • the obtained straw pulp is mixed with the wood pulp and then subjected to a process such as papermaking to obtain a writing sheet (base paper). After testing, the surface area of the writing sheet is 0. 3-1. 5 2 dust degree is 75 ⁇ 2 , and the opacity is 91%.
  • the preparation and performance of the food packaging paper are as follows: the straw raw material is added to the pot, and then the cooking liquid is added, the cooking liquid is heated to 160 ° C, and the pressure is raised to 0.65 MPa, and the cooking time is 200 minutes, wherein the cooking agent is The amount of ammonium sulfite is 10% of the amount of dry raw materials, the amount of sodium hydroxide is 5% of the amount of dry raw materials, and the liquid ratio is 1:8.
  • the obtained pulp is squeezed and washed to obtain grass pulp, straw pulp.
  • the hardness is 16 KMn (U, the tensile index is 38 Nm/g, the tear index is 4. 8 m ⁇ m7 g, the folding index is 4.
  • the paper layer (base paper) of the food packaging paper is obtained by the process of papermaking, and the area of the paper layer is 0. 3-2.
  • the dust degree of 0 mm 2 is 120 m ⁇ 2 ; the bursting degree is 75 kPa.
  • the whiteness is 28_60%.
  • the degree of dust is the degree of dust described in the method for determining the dustiness of paper and paperboard of the national standard GB/T 1541-1989.
  • the straw pulp fiber of the present invention is defined as a straw pulp fiber obtained by a cooking and washing step according to the prior art, or is prepared by a cooking, washing and oxygen delignification step, including but not limited to an ammonium imide method and a base.
  • the alkali method includes a strontium caustic soda method, a sulphate method or an alkaline sodium method.
  • the retort time is 150-, and the cooking time is 150-200.
  • the cooking time is 0.5-, the cooking time is 150- 250 minutes, in the cooking agent, wherein the amount of ammonium sulfite is 5-20% of the amount of dry raw materials, the amount of sodium hydroxide is 0-15% of the amount of dry raw materials, and the liquid ratio is 1: 2- 15, then the pulp fiber is obtained by slurrying and washing.
  • the oxygen delignification process may be added after the cooking or the washing of the above method, wherein the oxygen delignification process is preferably:
  • the concentration of the high-hardness pulp obtained after the adjustment of the cooking means that the concentration of the slurry is adjusted to 8-18%, that is, the oxygen delignification is preferably carried out under medium-concentration conditions.
  • the oxygen delignification is preferably a single stage oxygen delignification, carried out in an oxygen delignification reaction column.
  • the temperature of the slurry at the inlet of the reaction column is preferably 95-100 ° C
  • the pressure is preferably 0.9-1.2 MPa
  • the temperature at the outlet is preferably 100-105 ° C. 5MPa ⁇
  • the pressure is preferably 0. 2 - 0. 4MPa.
  • the amount of alkali used in the oxygen delignification is preferably 2-4% of the dry pulp amount based on sodium hydroxide, and the oxygen is preferably added in an amount of 20-40 kg per ton of pulp ; the slurry is in the reaction tower.
  • the reaction time is preferably from 60 to 90 minutes.
  • the pulp is conveyed and heated to 70 ° C for delivery to a slurry tube prior to said oxygen delignification treatment.
  • the oxygen delignification process is carried out by adding a weight of 0.2 to 1% of the magnesium salt as a protective agent.
  • the pulp hardness after oxygen delignification is preferably a potassium permanganate value of 10-14, which is equivalent to a high hardness pulp having a Kappa price of 13-19. More preferably, the hardness of the pulp obtained after the oxygen delignification reaction is a potassium permanganate value of 11-13, which corresponds to a Kappa price of 14. 5-17.
  • the straw pulp according to the present embodiment is made of any one or more of a combination of raw materials including wheat straw, straw straw, reed, arundo, or cotton stalk. Preferred are wheat straw and straw.
  • the mixed pulp of this embodiment further contains other industrial pulps, and the other industrial pulps include one or a combination of two or more kinds of bagasse pulp, wood pulp, cotton pulp, bamboo pulp or secondary fibers.
  • the secondary fiber is a pulp fiber reconstituted from recycled waste paper.
  • the weight content of the straw pulp fiber is preferably from 10 to 100%, more preferably from 30 to 97%, still more preferably from 51 to 95%, most preferably from 71 to 93%.
  • the household paper of the present embodiment may be constructed entirely of the straw pulp fibers, and the straw pulp fibers may be constructed with other vegetable pulp fibers.
  • the straw pulp fibers may be constructed with other vegetable pulp fibers.
  • wood pulp fibers, bamboo pulp fibers, and the like may be used.
  • the surface of the /g 0 is visible to the naked eye by 0.3 mm 2 to 2. 0 mm 2
  • the number of dust is 10 to 500 per square meter, preferably 20 to 400, more preferably 30 to 250.
  • the household paper is visible to the naked eye in a range of 2 to 5 mm, preferably 2 to 100, preferably 5 to 80, more preferably 20 to 60.
  • the base paper has a basis weight of 10 to 70 g/m 2 , preferably 15 to 50 g/m 2 , and more preferably 20 to 40 g/m 2 .
  • the color of the base paper is the base layer of the color of the straw pulp or straw pulp fibers and other vegetable pulp fibers.
  • the household paper is toilet paper, paper towel, wiping paper or tissue paper. The following are specific implementation examples.
  • the base layer has a basis weight of 10 g/m 2 and a whiteness of 45%.
  • the color is straw pulp fiber and wood.
  • the pulp fiber has a color, and the tensile index is 1. 5 N. m/g, 0. 3 mm 2 ⁇ 2. 0 mm 2 particles are less than 50 per square meter, and 3 to 10 mm holes are 3 to 10.
  • a sheet-like tissue paper consisting of three layers of 100% straw fiber.
  • the basic layer has a basis weight of 70 g/m 2 , a tensile index of 4 N. m/g, and a whiteness of 35%. straw color of the fibers themselves, 0. 3mm 2 ⁇ 2. 0mm 2 particles per square meter of 400 ⁇ 500, 2 ⁇ 5mm a 50 ⁇ 100 the bores.
  • a sheet-like paper towel consisting of two layers of 30% straw pulp fiber and 70% wood pulp fiber.
  • the base layer has a basis weight of 15 g/m 2 and a tensile index of 2 N. m/g. The degree is 55 ⁇ 70%, the color is the color of the straw fiber and the wood pulp fiber, 0. 3mm 2 ⁇ 2.
  • the particles are less than 20 per square meter, and the 2 ⁇ 5mm hole is 70 ⁇ 90. 5 N. m/g ⁇
  • a sheet-like wiping paper a basic layer composed of four layers of 60% straw fiber and 40% wood pulp fiber, the basic layer basis weight of 50g / m 2 , tensile index of 3. 5 N. m / g
  • the whiteness is 40%, the color is the color of the straw fiber and the wood pulp fiber, 0. 3mm 2 ⁇ 2.
  • the particles are less than 300 per square meter, and the 2 ⁇ 5mm hole is 30 ⁇ 50.
  • the utility model of the present invention is a basic layer composed of three layers of 80% straw pulp fibers and 20% wood pulp fibers, the basis layer having a basis weight of 20 g/m 2 and a tensile index of 2. 5 N. m/g, The whiteness is 38 ⁇ 40%, the color is the color of the straw fiber and the wood pulp fiber, 0. 3mm 2 ⁇ 2. 0mm 2 the particles are less than 450 per square meter, and the 2 ⁇ 5mm hole is 10 ⁇ 20.
  • the base paper is composed of two layers of 10% straw fiber and 90% bleached wood pulp fiber.
  • the basic layer has a basis weight of 30 ⁇ 40g/m 2 and a tensile index of 3 ⁇ 3.
  • 2 N. m/ g, whiteness is 65 ⁇ 75%, 0. 3mm 2 ⁇ 2.
  • 0mm 2 particles are less than 20 per square meter, 2 ⁇ 5mm holes 3 ⁇ 15.
  • the composite layer of the office paper has a split length of 1. 5 ⁇ 5km, preferably 2 ⁇ 4. 5km, more preferably 2. 5 ⁇ 4km; 70 ⁇ 100%, preferably 80 ⁇ 99%, more preferably 85 ⁇ 95%; 0. 3mm 2 ⁇ 2. 0mm 2
  • the number of dust is 10 ⁇ 500 per square meter, preferably 20 ⁇ 400, more It is preferably 30 to 250; and when the whiteness is 35 to 75%, it is preferably 35 to 65%, more preferably 40 to 60%.
  • the base layer (base paper) has a hue L value ranging from 65 to 95, a value range of 0 to 5, and b value ranging from 0 to 40; preferably, the L value is 70 ⁇ 94, a value of 0 to 4. 5, b value range of 0 to 35 base layer; more preferably L value of 80 to 91, a value of 0 to 3, b value of 0 to 30 base layer.
  • the composite layer of the office paper has a basis weight of 20 to 160 g/m 2 , preferably 30 to 80 g/m 2 , more preferably 40 to 70 g/m 2 .
  • the base layer of the office paper is provided with a glue layer on at least one side. That is, a glue layer can be provided on both sides, and a glue layer is provided on one layer.
  • the rubber layer is produced by a prior art sizing process, such as sizing with one or more of starch, animal glue or polyolefin materials, and specifically, for example, oxidized starch, polyacrylamide, Polyethylene-maleic anhydride polymer, acrylic latex, modified polyvinyl alcohol, sodium carboxymethyl cellulose or styrene-acrylate.
  • the sizing is carried out according to the prior art process, such as sizing by pressing method, sizing by glue tank, external sizing, spray sizing, door roller pressing sizing or calender sizing.
  • the amount of sizing agent can be referred to the prior art, preferably l 20 kg / ton of paper, more preferably 5 15 kg / ton of paper, most preferably 7 12 kg / ton of paper, specifically
  • a sheet-like offset printing paper comprising a base layer (base paper) composed of 50% of the straw pulp fiber and 50% unbleached wood pulp fiber, and a base layer on each side of the base layer, the basic layer whiteness 45 45%, hue L value range is 50 89 a value range is 0 2 b value range is 0 20, offset printing paper is 20 50 g / m 2 crack length is 1.5 2.5 km, 0.3 mm 2 2.0 2 particles are Less than 300 per square meter, opacity is 100%. Paper width is 10cm, length is 38cm
  • a sheet-like writing paper comprising a base layer of 100% of the straw pulp fibers, the base layer has a whiteness of 35 45%, and a layer of glue is applied to one side of the base layer.
  • the paper color is the color of the straw fiber itself.
  • Writing paper 0.3mm 2 2.0mm 2 particles are less than 500 per square meter, opacity is 95%
  • a sheet-like writing paper comprising a basic layer of 60% of the straw pulp fiber and 40% unbleached wood pulp fiber, the base layer has a whiteness of 40%, and the hue L value ranges from 65 to 75 a.
  • the value of 2.5 3 b is 20 35
  • the writing paper is 0.3mm 2 2.0mm 2
  • the particle size is less than 200 per square meter
  • the opacity is 80%
  • a typewriter paper the middle base layer is made up of 80% of the straw fiber and 20% wood pulp fiber structure
  • basic layer whiteness is 38 45%
  • hue L value range is 70 80 a value range is 3.5 5
  • b value range is 30 35
  • the opacity is 92%.
  • the paper has a width of 10 cm and a length of 20 cm.
  • the two surfaces of the base layer respectively have a rubber layer of modified polyvinyl alcohol, and the amount of sizing is 10 kg/ton of paper.
  • a sheet-shaped typewriter paper comprises a base layer of 10% of the straw pulp fiber and 90% wood pulp fiber (base paper), the basic layer whiteness is 55 65%, and the type paper is 0.3 mm 2 2.0 mm 2 particles per square meter. Less than 20, opacity is 94%
  • the base paper of the office paper of the present invention is constructed from the straw pulp fibers and/or other plant pulp fibers, and the configuration is any configuration of the prior art, such as The straw pulp is mixed with other vegetable pulps and then mixed, and the pulp can be first mixed and then beaten, so that the straw pulp fibers have a certain spatial structure with other plant pulp fibers, and the spatial structure is the prior art. Structure.
  • the office paper refers to xerographic paper, writing paper, offset printing paper or type paper.
  • the addition of a small amount of bleaching agent is 1/10 to 1/4 of the amount of the prior art.
  • the above-mentioned base paper made of oxygen delignification or straw pulp obtained by a bleaching process with a small amount of bleach can be used for the preparation of household paper and office paper.
  • a sheet-like electrophotographic paper comprising a base layer of 30% of the straw pulp fibers and 70% bleached wood pulp fibers, the grass fibers being made by cooking, washing and adding a small amount of bleaching agent.
  • the small amount is a 1/4 amount of bleaching agent added to the prior art, and each layer has a layer of glue on both sides of the base layer, the base layer has a whiteness of 65 to 75 %, and the hue L value ranges from 55 to 80, a range of values.
  • Lmm5 ⁇ 5, b value range is 9 ⁇ 35
  • the amount of xerographic paper is 130 ⁇ 160g/m 2
  • the length of the crack is 2 ⁇ 4. 5km, 0. 3mm 2 ⁇ 2. 0mm 2 particles are less per square meter At 20, the opacity is 90%.
  • the copy paper was sized with polyacrylamide.

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说 明 书
一种原纸以及制备方法和应用 技术领域
本发明涉及的是一种原纸 （base paper, 或者称加工原纸） ， 本发明所述的原 纸可以被进一步加工制成各种加工纸， 例如， 它们可以是课本的纸页层， 也可以是 写字本或包装纸的薄层， 或者是生活用纸的片状结构， 或者是办公用纸的基本层， 以及所述原纸的生产方法。 背景技术
现有技术中， 课本、 写字本、 复印纸等纸张的白度存在对眼睛的剌激， 同时存 在使用大量化学品的造成环境污染的问题
本发明所述的原纸没有添加其它染料、 颜料或色料， 在绝大部分情形下， 所述 的原纸不进行漂白或者仅仅进行轻漂白， 所得到的原纸自身可形成对视力有益的自 然黄色， 起到保护眼睛、 防治近视的目的； 同时， 在 100%使用本发明所述的纸基时， 还可避免二噁英等化学物质对人体造成的危害并对环保起到正面的作用。 发明内容
本发明的主要目的在于提供一种原纸；
本发明的另一个目的在于提供一种所述原纸的制备方法；
本发明还有一个目的是上述原纸在纸制品中的应用。
本发明的目的可以通过以下方式得以实现：
一种原纸， 抄造所述原纸的混合浆包括草浆和其他工业纸浆， 所述的混合浆中 草浆的重量比例为 10-100%， 优选为 30-90%， 更优选 40-80%; 所述的草浆的硬度为 10_17KMn04值， 平均纤维长度为 0. 1-2. 5mm, 抗张指数为 23_57Nm/g， 撕裂指数为 3. 0-6. OmN · mVg以及耐折指数为 2_6kPa · m2/g; 所述的草浆的白度为 28_50%，优选 为 30-45%， 更优选 25-43%。
所述原纸的制备方法包括将禾草类原料加入锅中， 再加入蒸煮液， 蒸煮液升温 100-200 °C , 升压至 0. 3-0. 9MPa， 蒸煮时间为 150-250分钟， 所述的蒸煮药剂中， 其中亚硫酸铵用量为对绝干原料量的 5-20%， 配氢氧化钠量为绝干原料量的 0-15%， 液比为 1 : 2-15, 得到的浆经挤浆、 洗涤后得到草浆。
其中优选的为将禾草类原料加入锅中， 再加入蒸煮液， 蒸煮液升温至 156-173 V， 升压至 0. 6-0. 75MPa， 蒸煮时间为 180-220分钟， 所述的蒸煮药剂中， 其中亚硫 酸铵用量为对绝干原料量的 9-15%， 配氢氧化钠量为绝干原料量的 0-8%， 液比为 1 : 6-10, 得到的浆经挤浆、 洗涤后得到草浆。
所述的洗浆后得到的浆料进一步氧脱木素， 所述的氧脱木素包括： 将蒸煮后所 得的浆料或者洗涤后的浆料送入氧脱木素反应塔中， 所述浆料在反应塔进口处的温 度为 90— 100°C， 压力为 0. 9— 1. 2MPa; 出口处的温度为 95— 105°C， 压力为 0. 2— 0. 6MPa; 所述的氧脱木素在用碱量为以氢氧化钠计对绝干浆量的 2-4%， 氧气的加入 量为每吨浆 20— 40kg的条件下进行 60— 90分钟， 得到草浆。
还可加入氧脱木素过程， 其中氧脱木素过程包括： 1 )调节蒸煮后所得高硬度浆 的浓度； 2 ) 将该浆泵送至氧脱木素反应塔， 并加入氢氧化钠和氧气； 3 ) 该浆在该 氧脱木素反应塔内进行氧脱木素反应； 所述的调节蒸煮后所得高硬度浆的浓度是指 将所述浆的浓度调节为 8— 18 % ; 所述的氧脱木素优选为单段氧脱木素，在氧脱木素 反应塔中进行。
在氧脱木素过程中， 所述的浆在该反应塔进口处的温度优选为 95— 100°C，压力 优选为 0. 9— 1. 2MPa， 出口处的温度优选为 100— 105°C， 压力优选为 0. 2— 0. 4Mpa; 所述的氧脱木素中用碱量优选为以氢氧化钠计对绝干浆量的 2-4%， 氧气的加入 量优选为每吨浆 20— 40kg; 所述浆在该反应塔内的反应时间优选为 60— 90分钟； 所述的氧脱木素处理之前优选将纸浆输送并加热至 70°C送到一浆管； 所述氧脱木素过程中优选加入绝干浆重量 0. 2— 1 %的镁盐作为保护剂。
可以加入现有技术的 1/10〜1/4的漂白剂。
本发明的有益效果具有如下有益效果：
( 1 )本发明所述的原纸制成的课本不用添加其它染料、 颜料或色料就能使人形 成较佳视力环境的黄色， 起到保护眼睛、 防治近视的目的；
( 2 )本发明所述的未经过漂白工序的草浆， 避免了二噁英等造成的健康威胁和 环保问题；
( 4)本发明所述的原纸制成的产品， 可以不含染料、 颜料或色料， 草浆也不用 漂白， 从而降低了制造成本。 具体实施方式
以下用实施例对本发明的技术方案作进一步的说明， 将有助于对本发明的技术 方案的优点， 效果有更进一步的了解， 实施例不限定本发明的保护范围， 本发明的 保护范围由权利要求来决定。
实施例 1
本实施例涉及的是本发明所述草浆的制备方法：
本实施例所述的草浆是包括经蒸煮、 洗涤步骤后得到的浆， 或者经蒸煮、 洗涤、 氧脱木素步骤得到的浆。
所述的蒸煮可以是现有技术公开的常用的蒸煮方法， 其包括亚铵法、 烧碱法、 烧碱一蒽醌法、 硫酸盐法或碱性亚钠-蒽醌法。
本发明优选如下方法： 将禾草类原料加入锅中， 再加入蒸煮液， 蒸煮液升温至
100-200°C , 升压至 0. 3-0. 9MPa， 蒸煮时间为 150-250分钟， 所述的蒸煮药剂中， 其 中亚硫酸铵用量为对绝干原料量的 5-20%， 配氢氧化钠量为绝干原料量的 0-15%， 液 比为 1 : 2-15, 得到的浆经挤浆、 洗涤后得到草浆。
更优选为： 将禾草类原料加入锅中， 再加入蒸煮液， 蒸煮液升温至 156-173°C， 升压至 0. 6-0. 75MPa， 蒸煮时间为 180-220分钟， 所述的蒸煮药剂中， 其中亚硫酸铵 用量为对绝干原料量的 9-15%，配氢氧化钠量为绝干原料量的 0-8%，液比为 1 : 6-10, 得到的浆经挤浆、 洗涤后得到草浆。
将上述洗浆后得到的浆料进一步氧脱木素， 得到需要的草浆。
所述的氧脱木素包括： 将蒸煮后所得的浆料或者洗涤后的浆料送入氧脱木素反 应塔中， 所述浆料在反应塔进口处的温度为 90— 100°C， 压力为 0. 9— L 2MPa; 出口 处的温度为 95— 105°C， 压力为 0. 2— 0. 6MPa;
所述的氧脱木素在用碱量为以氢氧化钠计对绝干浆量的 2-4%， 氧气的加入量为 每吨浆 20— 40kg的条件下进行 60— 90分钟， 得到草浆。
所述的草浆的硬度为 10_17 ：104值， 平均纤维长度为 0. 1-2. 5mm， 抗张指数为
23-57Nm/g, 撕裂指数为 3. 0-6. Om · m2/g以及耐折指数为 2_6kPa · m2/g。
所述的草浆的白度为 28-50%， 优选为 30-45%， 更优选 25_43%。
本实施例所述的草浆， 是由包括麦草秸秆、 稻草秸秆、 芦苇、 芦竹或棉秆中的 一种或者二种以上的任意组合原料制成。 优选为麦草和稻草。 本实施例还涉及一种混合浆还含有其他工业纸浆， 所述的其他工业纸浆包括蔗 渣浆、 木浆、 棉浆、 竹浆或二次纤维的一种或两种以上的任意组合。
所述二次纤维为回收废纸重新制成的纸浆纤维。
所述的混合浆中草浆的重量比例为 10-100%， 优选为 30-90%， 更优选 40-80% 实施例 2
本实施例是涉及的一种草浆， 其他和实施例 1相同， 不同的是， 在本实施例中， 所得到的 100%草浆的硬度为 10_17KMn04值、 平均纤维长度为 0. 1-2. 5
抗张指数为 23-57N. m/g、 撕裂指数为 3. 0-6. 0 m · m2/g、 耐破指数为
2-6kPa · m7g的草浆所形成的原纸。
本实施例还涉及一种混合浆用来制备一种防近视课本原纸， 其中， 所述的 页面为一含草浆的纸浆形成的白度为 40-76%、优选 50 76%、更优选 60 76%的纸页 层， 不含染料、 颜料或色料。 进一步的， 所述的页面为不透明度为 70 100 %， 优选 为 80 99 %， 更优选为 85 95 %的纸页层。
本实施例还涉及一种用混合浆制备的一种书刊原纸， 由所述的原纸在此指 书页， 所述的混合浆形成白度 40-76%、 优选 50 76%、 更优选 60 76%的纸页层， 不 含染料、 颜料或色料， 进一步的， 所述的书页不透明度为 70 100 %， 优选为 80 99 % , 更优选为 85 95 %的纸页层。
实施例 3
其他同实施例 1同， 具体的， 通过以下方式得到的草浆纤维和木浆纤维的交织 成的网状结构， 这种网状结构的纸多孔、 粗糙， 光学非结合面积大， 纸页的不透明 度高。
写字纸的制备及性能如下： 将稻草原料加入锅中， 再加入蒸煮液， 蒸煮液升温 至 165 °C， 升压至 0. 70MPa， 蒸煮时间为 240分钟， 所述的蒸煮药剂中， 其中亚硫酸 铵用量为对绝干原料量的 15%， 配氢氧化钠量为绝干原料量的 5%， 液比为 1 : 8， 得 到的浆经挤浆、 洗涤后得到草浆， 草浆的硬度为 16 KMn04值， 抗张指数为 28Nm/g 撕裂指数为 3. 9m · m7g， 耐折指数为 3. 4kPa · m7g， 草浆的白度为 35%。 所得草浆 与木浆混合后进行抄造等工艺得到写字页 （原纸） ， 经检测， 写字页表面上面积为 0. 3-1. 5 2的尘埃度 75个 · 2, 不透明度为 91%, 白度为 51% 食品包装纸的制备及性能如下： 将稻草原料加入锅中， 再加入蒸煮液， 蒸煮液 升温至 160°C， 升压至 0. 65MPa， 蒸煮时间为 200分钟， 所述的蒸煮药剂中， 其中亚 硫酸铵用量为对绝干原料量的 10%， 配氢氧化钠量为绝干原料量的 5%， 液比为 1 : 8， 得到的浆经挤浆、 洗涤后得到草浆， 草浆的硬度为 16 KMn(U ， 抗张指数为 38Nm/g， 撕裂指数为 4. 8m · m7g， 耐折指数为 4. 6kPa · m2/g， 草浆的白度为 35%。 所得浆料 进行抄造等工艺得到食品包装纸的纸层（原纸）， 经检测， 纸层的面积为 0. 3-2. 0mm2 的尘埃度 120个 · m— 2 ; 耐破度 75kPa。 纸层的白度为 28_60%。
所述的尘埃度为国家标准 GB/T 1541-1989纸和纸板尘埃度的测定方法中所述的 尘埃度。 实施例 4
本发明所述的草浆纤维定义为按照现有技术经蒸煮和洗涤步骤得到的草浆纤 维， 或者经蒸煮、 洗涤和氧脱木素步骤制备， 所述蒸煮包括但不限于亚铵法和碱法， 所述的碱法包括蒽醌一烧碱法、 硫酸盐法或碱性亚钠法。
本实施例优选按照如下方法进行蒸煮： 将秸秆类植物原料加入锅中， 再加入蒸 煮液， 蒸煮液升温至 100-200°C， 升压至 0. 3-0. 9MPa， 蒸煮时间为 150-250分钟， 所述的蒸煮药剂中， 其中亚硫酸铵用量为对绝干原料量的 5-20%，配氢氧化钠量为绝 干原料量的 0-15%， 液比为 1 : 2-15, 然后再经挤浆、 洗浆得到所述草浆纤维。
在上述方法的蒸煮后或洗浆后还可加入氧脱木素过程， 其中氧脱木素过程优选 为：
1 ) 调节蒸煮后所得高硬度浆的浓度；
2 ) 将该浆泵送至氧脱木素反应塔， 并加入氢氧化钠和氧气；
3 ) 该浆在该氧脱木素反应塔内进行氧脱木素反应。
所述的调节蒸煮后所得高硬度浆的浓度是指将所述浆的浓度调节为 8— 18 %，也 就是说， 优选在中浓条件下进行氧脱木素。
所述的氧脱木素优选为单段氧脱木素， 在氧脱木素反应塔中进行。 在氧脱木素 过程中， 所述的浆在该反应塔进口处的温度优选为 95— 100°C， 压力优选为 0. 9— 1. 2MPa, 出口处的温度优选为 100— 105°C， 压力优选为 0. 2— 0. 4MPa。
所述的氧脱木素中用碱量优选为以氢氧化钠计对绝干浆量的 2-4%， 氧气的加入 量优选为每吨浆 20— 40kg; 所述浆在该反应塔内的反应时间优选为 60— 90分钟。 所述的氧脱木素处理之前优选将纸浆输送并加热至 70°C送到一浆管。
所述氧脱木素过程中优选加入绝干浆重量 0. 2— 1 %的镁盐作为保护剂。
氧脱木素后的浆硬度优选为高锰酸钾值 10-14，相当于卡伯价 13-19. 8的高硬度 浆。 更为优选的是， 氧脱木素反应后得到的浆硬度为高锰酸钾值 11一 13， 相当于卡 伯价为 14. 5-17. 9。
本实施例所述的草浆， 是由包括麦草秸秆、 稻草秸秆、 芦苇、 芦竹或棉秆中的 一种或者二种以上的任意组合原料制成。 优选为麦草和稻草。
本实施例所述混合浆还含有其他工业纸浆， 所述的其他工业纸浆包括蔗渣浆、 木浆、 棉浆、 竹浆或二次纤维的一种或两种以上的任意组合。 所述二次纤维为回收 废纸重新制成的纸浆纤维。
其中所述草浆纤维重量含量优选为 10〜100 %， 更优选为 30〜97 %， 再优选为 51〜95 %， 最优选为 71〜93 %。
本实施例所述生活用纸可以全部由所述草浆纤维构造而成， 还可用所述草浆纤 维同其它植物浆纤维构造而成， 例如可以使用木浆纤维、 竹浆纤维等。
所述的生活用纸， 其原纸抗张指数为 1. 5〜4 N. m/g, 优选为 2〜3. 5 N. m/g, 更 优选为 2. 3〜3. 2 N. m/g0表面肉眼可见的 0. 3mm2〜2. 0mm2尘埃数量为每平米 10〜500 个， 优选为 20〜400个， 更优选为 30〜250个。 所述的生活用纸， 所述生活用纸肉 眼可见 2〜5mm洞眼为 2〜100个， 优选为 5〜80个， 更优选为 20〜60个。
本实施例所述的尘埃和洞眼均参见国家标准定义， 如标准 GB/T20808-2006即提 到所述的尘埃和洞眼。 本实施例所述的生活用纸， 所述原纸的定量为 10〜70g/m2， 优选为 15〜50g/m2， 更优选为 20〜40g/m2。 所述原纸的颜色为所述草浆纤维或草浆 纤维和其它植物浆纤维自身颜色的基本层。 所述的生活用纸为卫生纸、 擦手纸、 擦 拭纸或纸巾纸。 以下是具体的实施例子。
一种片状纸巾纸， 为一层 50 %草浆纤维和 50 %木浆纤维构造而成的基本层， 基 本层定量为 10g/m2， 白度为 45 %， 颜色为草浆纤维和木浆纤维自身颜色， 抗张指数 为 1. 5 N. m/g, 0. 3mm2〜2. 0mm2颗粒物为每平米少于 50个， 2〜5mm洞眼 3〜10个。
一种片状纸巾纸， 为三层 100 %草浆纤维构造而成的基本层组成，基本层定量为 70g/m2，抗张指数为 4 N. m/g,白度为 35 %，颜色为草浆纤维自身颜色， 0. 3mm2〜2. 0mm2 颗粒物为每平米 400〜500个， 2〜5mm洞眼 50〜100个。 一种片状擦手纸，为两层 30 %草浆纤维和 70 %木浆纤维构造而成的基本层组成， 基本层定量为 15g/m2， 抗张指数为 2 N. m/g， 白度为 55〜70 %， 颜色为草浆纤维和 木浆纤维自身颜色， 0. 3mm2〜2. 0mm2颗粒物为每平米少于 20个， 2〜5mm洞眼 70〜90 个。 一种片状擦拭纸，为四层 60 %草浆纤维和 40 %木浆纤维构造而成的基本层组成， 基本层定量为 50g/m2， 抗张指数为 3. 5 N. m/g， 白度为 40 %， 颜色为草浆纤维和木 浆纤维自身颜色， 0. 3mm2〜2. 0mm2颗粒物为每平米少于 300个， 2〜5mm洞眼 30〜50 个。 一种卷筒卫生纸，为三层 80 %草浆纤维和 20 %木浆纤维构造而成的基本层组成， 基本层定量为 20g/m2， 抗张指数为 2. 5 N. m/g, 白度为 38〜40 %， 颜色为草浆纤维 和木浆纤维自身颜色， 0. 3mm2〜2. 0mm2颗粒物为每平米少于 450个， 2〜5mm洞眼 10〜 20个。
一种片状卫生纸， 制成长条状并折叠放置。 所述卫生纸为两层 10 %草浆纤维和 90 %漂白木浆纤维构造而成的基本层组成， 基本层定量为 30〜40g/m2， 抗张指数为 3〜3. 2 N. m/g， 白度为 65〜75 %， 0. 3mm2〜2. 0mm2颗粒物为每平米少于 20个， 2〜5mm 洞眼 3〜15个。 实施例 5
其他同实施例 4， 不同的是， 所述的办公用纸的复合层为裂断长为 1. 5〜5km， 优选为 2〜4. 5km， 更优选为 2. 5〜4km; 不透明度为 70〜100 %， 优选为 80〜99 %， 更优选为 85〜95 %； 肉眼可见的 0. 3mm2〜2. 0mm2尘埃数量为每平米 10〜500个， 优 选为 20〜400个， 更优选为 30〜250个； 白度为 35〜75 %时， 优选为 35〜65 %， 更 优选为 40〜60 %。所述的办公用纸， 所述基本层（原纸）的色相 L值范围为 65〜95， a值范围为 0〜5， b值范围为 0〜40的基本层；优选为 L值为 70〜94， a值为 0〜4. 5， b值范围为 0〜35的基本层； 更优选为 L值为 80〜91， a值为 0〜3， b值为 0〜30的 基本层。 所述的办公用纸的复合层为定量为 20〜160g/m2， 优选为 30〜80g/m2， 更优 选为 40〜70g/m2。
所述办公用纸基本层至少一侧设置胶层。 即可以为两侧都设置胶层， 一层设置 胶层。 所述胶层为现有技术施胶工艺所产生， 譬如采用淀粉类、 动物胶类或者聚烯 烃类材料中的一种或几种结合进行施胶， 再具体譬如采用氧化淀粉、 聚丙烯酰胺、 聚乙烯 -马来酸酐聚合物、 丙烯酸胶乳、 改性聚乙烯醇、 羧甲基纤维素钠或苯乙烯- 丙烯酸酯等。 按照现有技术工艺进行施胶， 譬如采用压搾法施胶、 施胶槽施胶、 机 外施胶、 喷雾施胶、 门辊压搾施胶或压光机施胶等方法。 施胶剂用量可以参照现有 技术， 优选为 l 20kg/吨纸， 更优选为 5 15kg/吨纸， 最优选为 7 12kg/吨纸， 具 体地：
一种片状胶版印刷纸， 包含一层 50%所述草浆纤维和 50%未漂木浆纤维构造而 成的基本层 （原纸） ， 基本层两侧各有一层胶层， 基本层白度为 45 50%， 色相 L 值范围为 50 89 a值范围为 0 2 b值范围为 0 20，胶版印刷纸定量为 20 50g/m2 裂断长为 1.5 2.5km, 0.3mm2 2.0 2颗粒物为每平米少于 300个， 不透明度为 100 %。 纸张宽度为 10cm， 长度 38cm
一种片状书写纸， 包含一层 100%所述草浆纤维构造而成的基本层，基本层白度 为 35 45%， 基本层一侧涂布一层胶层。 纸张颜色为所述草浆纤维自身颜色。 书写 纸 0.3mm2 2.0mm2颗粒物为每平米少于 500个， 不透明度为 95%
一种片状书写纸， 包含一层 60%所述草浆纤维和 40%未漂木浆纤维构造而成的 基本层， 基本层白度为 40%， 色相 L值范围为 65 75 a值范围为 2.5 3 b值范 围为 20 35，书写纸 0.3mm2 2.0mm2颗粒物为每平米少于 200个，不透明度为 80% 一种打字纸， 中间的基本层由 80%所述草浆纤维和 20%木浆纤维构造而成， 基 本层白度为 38 45%，色相 L值范围为 70 80 a值范围为 3.5 5 b值范围为 30 35， 打字纸 0.3mm2 2.0mm2颗粒物为每平米少于 450个， 不透明度为 92%。 纸张宽 度为 10cm，长 20cm。基本层两个表面分别具有改性聚乙烯醇的胶层，施胶量为 10kg/ 吨纸。
一种片状打字纸。所述打字纸包括一 10%所述草浆纤维和 90%木浆纤维构造而 成的 （原纸） 基本层， 基本层白度为 55 65%， 打字纸 0.3mm2 2.0mm2颗粒物为每 平米少于 20个， 不透明度为 94% 本发明所述的办公用纸的原纸由所述草浆纤维和 /或其它植物浆纤维构造而成， 所述构造即为现有技术任何构造， 譬如可以将草浆同其它植物浆分别打浆后混合均 勾， 也可以是先混合均勾后再打浆， 从而草浆纤维同其它植物浆纤维具有了一定的 空间结构， 这种空间结构即为现有技术的结构。
所述的办公用纸是指静电复印纸、 书写纸、 胶版印刷纸或打字纸。 实施例 6
其他同实施例 4或 5， 不同的是， 可以采用蒸煮、洗涤和加入少量漂白剂漂白的 步骤。
所述加入少量漂白剂为现有技术加入量的 1/10〜1/4。上述经过氧脱木素或使用 少量漂白剂漂白过程后得到的草浆纤维制成的原纸可以用来制备生活用纸和办公用 纸。
例如， 一种片状静电复印纸， 包含一层 30 %所述草浆纤维和 70 %漂白木浆纤维 构造而成的基本层， 所述草纤维为经蒸煮、 洗涤和加入少量漂白剂制成， 所述少量 为加入现有技术 1/4的量的漂白剂， 基本层两侧各有一层胶层， 基本层白度为 65〜 75 % , 色相 L值范围为 55〜80， a值范围为 L 5〜5， b值范围为 9〜35， 静电复印纸 定量为 130〜160g/m2， 裂断长为 2〜4. 5km， 0. 3mm2〜2. 0mm2颗粒物为每平米少于 20 个， 不透明度为 90 %。 所述复印纸使用聚丙烯酰胺施胶。

Claims

权 利 要 求 书
、 一种原纸， 其特征在于抄造所述原纸的混合浆包括草浆和其他工业纸浆，所述的 混合浆中草浆的重量比例为 10-100%， 优选为 30-90%， 更优选 40-80%; 所述的草 浆的硬度为 10_17KMn04值， 平均纤维长度为 0. 1-2. 5匪， 抗张指数为 23_57Nm/g， 撕裂指数为 3. 0-6. Om · mVg以及耐折指数为 2_6kPa · m7g; 所述的草浆的白度 为 28-50%， 优选为 30-45%， 更优选 25-43%。
、 一种制备权利要求 1所述原纸的方法，其特征在于所述的方法包括将禾草类原料 加入锅中， 再加入蒸煮液， 蒸煮液升温至 100-200°C， 升压至 0. 3-0. 9MPa， 蒸煮 时间为 150-250分钟， 所述的蒸煮药剂中， 其中亚硫酸铵用量为对绝干原料量的 5-20%， 配氢氧化钠量为绝干原料量的 0-15%， 液比为 1 : 2-15, 得到的浆经挤浆、 洗涤后得到草浆。
、 根据权利要求 2所述的方法，其特征在于将禾草类原料加入锅中，再加入蒸煮液， 蒸煮液升温至 156_173°C， 升压至 0. 6-0. 75MPa， 蒸煮时间为 180-220分钟， 所 述的蒸煮药剂中， 其中亚硫酸铵用量为对绝干原料量的 9-15%， 配氢氧化钠量为 绝干原料量的 0-8%， 液比为 1 : 6-10, 得到的浆经挤浆、 洗涤后得到草浆。 、 根据权利要求 2或 3所述的方法，其特征在于所述的洗浆后得到的浆料进一步氧 脱木素， 所述的氧脱木素包括： 将蒸煮后所得的浆料或者洗涤后的浆料送入氧脱 木素反应塔中， 所述浆料在反应塔进口处的温度为 90— 100°C， 压力为 0. 9—
1. 2MPa; 出口处的温度为 95— 105°C， 压力为 0. 2— 0. 6MPa; 所述的氧脱木素在 用碱量为以氢氧化钠计对绝干浆量的 2-4%， 氧气的加入量为每吨浆 20— 40kg的 条件下进行 60— 90分钟， 得到草浆。
、 根据权利要求 2或 3所述的方法，其特征在于蒸煮或洗浆后还可加入氧脱木素过 程， 其中氧脱木素过程包括： 1 ) 调节蒸煮后所得高硬度浆的浓度； 2 ) 将该浆泵 送至氧脱木素反应塔， 并加入氢氧化钠和氧气； 3 ) 该浆在该氧脱木素反应塔内 进行氧脱木素反应； 所述的调节蒸煮后所得高硬度浆的浓度是指将所述浆的浓度 调节为 8— 18 % ; 所述的氧脱木素优选为单段氧脱木素， 在氧脱木素反应塔中进 行； 在氧脱木素过程中， 所述的浆在该反应塔进口处的温度优选为 95— 100°C， 压力优选为 0. 9— L 2MPa， 出口处的温度优选为 100— 105°C， 压力优选为 0. 2— 0. 4Mpa; 所述的氧脱木素中用碱量优选为以氢氧化钠计对绝干浆量的 2-4%，氧气 的加入量优选为每吨浆 20— 40kg; 所述浆在该反应塔内的反应时间优选为 60—
1 90分钟； 所述的氧脱木素处理之前优选将纸浆输送并加热至 70°C送到一浆管； 所述氧脱木素过程中优选加入绝干浆重量 0. 2— 1 %的镁盐作为保护剂。
6、 一种原纸， 其特征在于所述的原纸的色相 L值范围为 65〜95， a值范围为 0〜5， b值范围为 0〜40; 优选为 L值为 70〜94， a值为 0〜4. 5， b值范围为 0〜35; 更 优选为 L值为 80〜91， a值为 0〜3， b值为 0〜30; 氧脱木素后的浆硬度优选为 高锰酸钾值 10-14， 相当于卡伯价 13-19. 8的高硬度浆； 更为优选的是， 氧脱木 素反应后得到的浆硬度为高锰酸钾值 11一 13， 相当于卡伯价为 14. 5-17. 9; 在制 备原纸采用的混合浆中， 草浆纤维重量含量优选为 10〜 100 %， 更优选为 30〜97 % , 再优选为 51〜95 %， 最优选为 71〜93 %。
7、 一种制备权利要求 6所述原纸的方法，其特征在于用于原纸的草浆的制备方法包 括， 将原料加入锅中， 再加入蒸煮液， 蒸煮液升温至 ioo-2(xrc， 升压至
0. 3-0. 9MPa, 蒸煮时间为 150-250分钟， 所述的蒸煮药剂中， 其中亚硫酸铵用量 为对绝干原料量的 5-20%，配氢氧化钠量为绝干原料量的 0-15%，液比为 1 : 2-15， 然后再经挤浆、 洗浆得到所述草浆纤维。
8、 根据权利要求 7所述的方法，其特征在于在所述的蒸煮后或洗浆后还可加入氧脱 木素过程， 其中氧脱木素过程优选为：
1 ) 调节蒸煮后所得高硬度浆的浓度；
2 ) 将该浆泵送至氧脱木素反应塔， 并加入氢氧化钠和氧气；
3 ) 该浆在该氧脱木素反应塔内进行氧脱木素反应；
所述的调节蒸煮后所得高硬度浆的浓度是指将所述浆的浓度调节为 8— 18 % ; 所述的氧脱木素优选为单段氧脱木素， 在氧脱木素反应塔中进行； 在氧脱木素 过程中， 所述的浆在该反应塔进口处的温度优选为 95— 100°C， 压力优选为 0. 9— 1. 2MPa, 出口处的温度优选为 100— 105°C， 压力优选为 0. 2— 0. 4Mpa;
所述的氧脱木素中用碱量优选为以氢氧化钠计对绝干浆量的 2-4%， 氧气的加入 量优选为每吨浆 20— 40kg; 所述浆在该反应塔内的反应时间优选为 60— 90分钟； 所述的氧脱木素处理之前优选将纸浆输送并加热至 70°C送到一浆管； 所述氧脱木素过程中优选加入绝干浆重量 0. 2— 1 %的镁盐作为保护剂。
9、 根据权利要求 7所述的方法，其特征在于可以加入现有技术的 1/10〜1/4的漂白 剂。
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