CN101255670A

CN101255670A - Exquisite kraft paper and producing method thereof

Info

Publication number: CN101255670A
Application number: CNA2008100933910A
Authority: CN
Inventors: 王福纪; 朱杰; 苏德良; 桂来争; 刘便初; 赵桂林; 杨爱平; 刘玉石; 杨蓉
Original assignee: XIANGJIANG PAPER INDUSTRY Co Ltd YONGZHOU
Current assignee: YUEYANG PAPER Co.,Ltd.
Priority date: 2007-06-26
Filing date: 2008-04-16
Publication date: 2008-09-03
Anticipated expiration: 2028-04-16
Also published as: CN101100829A; CN101255670B

Abstract

The invention relates to a exquisite kraft paper and the preparation method, which is that: more than 60% masson pine, less than 15% Chinese fir and less than 40% hardwood are prepared, steamed and boiled, washed and screened, oxygen delignified and blesched, then is made into a sulfate micro-bleaching pulp, the whiteness of the pulp is 24-34%, the beating consistensy is 3.5-4.0%, the beating degree is 26-34 degree SR, and the wet weight is 10-15 g. after carried on beating, the kraft paper is made by that the pulp is carried on desanding, flavoring, the fine screening of a pressure screen, molding, pressing, drying, curling, rewinding and packing. The quantitative product is 40-120 g/M<2>, the broke resistance index is less than 1.7 Kpa.m<2>/g, the surface water absorption is 25-45 g/M<2>, the whiteness is 21.5-30%, the water content is 6-11%, the lead content (weighting as Pb) is less than or equal to 3 mg/kg, the arsenic content (weighting as As) is less than or equal to 0.8 mg/kg, the fluorescent substances are 254 nm and 365 nm, the decolorization test (water, n-hexane) shows negative, the coliform group content is less than or equal to 30 per 100 g, and the pathogenic bacteria content is 0.

Description

Exquisite kraft paper and production method thereof

Technical field:

The present invention relates to a kind of paper and production method thereof, especially relate to a kind of Exquisite kraft paper and production method thereof.

Background technology:

Exquisite kraft paper is the renewal product of common brown paper, except that high strength, also need have presentation quality preferably, certain printing performance with common brown paper, to satisfy growing wrapper industry requirement, relevant research document has appearred in recent years:

Chinese patent application numbers 93109932 process for making highly finished kraft paper disclosed, comprise successively by stripping off the skin, chip, boiling, wash the preorder technology that material and slagging-off are formed, successively by making beating, online, squeezing, optical pressure, oven dry, press polish, curl and reach the post-order process that rewinding is formed, the invention is characterized in water content less than 35%, the cold water extract is less than 2.21%, the hot water extract is less than 1.9%, the 1%NaOH extract is less than 13.03%, the paper pulp fiber that lignin content becomes via the preorder PROCESS FOR TREATMENT less than 27.44% larch, by weight with fiber: calcium hypochlorite stirs by 100: 4 mixed, bleaching liquor 20～30 minutes, wash after concentrating that to expect into whiteness be 19 °～21 ° paper pulp, handle through post-order process again and make highly finished kraft paper.

Chinese patent application numbers 98106862 discloses a kind of technology for producing bleached refined kraft and products thereof.Finish by following operation: A, get 100% Russian bleaching needle-point leaf pulp raw material; B, raw material in the A operation dissolved in the water carry out pulping and put into stock tank with hydrabrusher; C, with pump the slurry in the B operation is squeezed into decker and concentrate, concentration is 3.4～4.8%; D, the slurry after will concentrating through the C operation with pump are squeezed into three The double plate mill carries out combined type series connection making beating, and beating degree is 24～38 ° of SR; E, will put into the pond of sizing mixing through the slurry after the D operation making beating and add 8～15 kilograms of/ton slurries of rosin, 40～60 kilograms of/ton slurries of alumina, 100～300 milliliters of/ton slurries of toner successively and size mixing, and put into then and copy preceding stock tank; F, the slurry after will sizing mixing through the E operation are copied paper with fourdrinier paper machine, and this machine hand's preface comprises online, squeezing, optical pressure, oven dry, press polish, curl etc.; G, then carry out rewinding; H, pack warehouse-in at last.

Chinese patent application numbers 200610047147 has proposed a kind of method of utilizing American waste paper to produce highly finished kraft paper, at first selected American waste paper, satisfactory American waste paper is packed in the container, add behind the water through heat treated, temperature is controlled between 90-130 ℃, heat time heating time is between 90-130 minute, high-temperature process need add cooking catalyst, dosage control is in ton consumption 0.5-0.9Kg, cooking catalyst adds at twice, before high-temperature process, add 50% of total amount for the first time, when the high-temperature process temperature reaches 80 ℃, add 50% of total amount for the second time again; Raw material after the heating also needs to carry out dispersion treatment with hot dispersing apparatus, again through making beating, rinsing, defibrination, remove quarrel, overfall, return then high-order cylinder again through online, squeezing, oven dry, press polish, curling to go out finished product.

Chinese patent application number 93109932 disclosed schemes use larch to be raw material, adopt hypochlorite bleaching, have to produce in the bleaching process to be difficult for biodegradable organic chloride the shortcoming that environment is polluted; The scheme of Chinese patent application numbers 98106862 is a raw material with 100% Russian bleaching needle-point leaf pulp, has the production cost height, externally the high shortcoming of dependence; Chinese patent application numbers 200610047147 has proposed a kind of method of utilizing American waste paper to produce highly finished kraft paper,

By the highly finished kraft paper of above-mentioned production, its product can not satisfy the quality requirement of national correlation department about the packaging for foodstuff body paper, is subjected to restriction to a certain degree in the use.And the fibrous raw material that uses is more single, and cost is higher.

Summary of the invention:

Technical problem to be solved by this invention provides the multiple fibrous raw material production of a kind of use, have low cost, the low pollution meets the cleaner production requirement, meet the requirement of packaging for foodstuff original paper quality, color is near the low whiteness Exquisite kraft paper and the production method thereof of fiber true qualities.

For solving the problems of the technologies described above, the present invention is achieved in that and uses the over dry mass ratio to be not less than 60% masson pine, is no more than 15% China fir, is no more than 40% leaf wood raw material and mixes or produce sulfate true qualities wood pulp separately; The true qualities wood pulp mixes the back and produces little wood pulp that floats by oxygen delignification and hydrogen peroxide bleaching, oxygen delignification slurry concentration 7-12%, temperature 70-90 ℃, oxygen is pressed 300-500Kpa, bleaching slurry concentration 8-12%, hydrogen peroxide consumption 1-2% (to the absolute dried paper pulp weight ratio), bleaching pH value 10.5-11; Little wood pulp whiteness 24-34% that floats, slurry is pulled an oar under beating consistency 3.5-4.0%, beating degree 26-34 ° of SR, weight in wet base: 10-15g, the slurry after the making beating through desanding, condiment, pressurized screen fine screen, go up net forming, squeezing, drying, batch, rewinding, packing form.The Exquisite kraft paper of producing quantitatively is 40-120g/M ², burst index is not less than 1.7KPam ²/ g, surface absorption 25-45g/M ², whiteness 21.5-30%, moisture 6-11%, lead content (in Pb)≤3mg/kg, arsenic content (in As)≤0.8mg/kg, fluorescent substance 254nm and 365nm and Decolorant Test (water, n-hexane) are all negative, every 100g coliform≤30, do not contain pathogenic bacteria.

Beneficial effect of the present invention: mix the slurry that uses needlebush and broad-leaved wood fiber raw material to make and manufacture paper with pulp, the Exquisite kraft paper of production, except that having higher physical strength, formation of sheet has significant improvement in appearance; Use China fir and multiple leaf wood to produce, solved a difficult problem of producing the China fir slurry, effectively utilized industrial wood waste China fir side plate, can save the needle-leaved wood fibre raw material, reduce production costs; Do not add the chemicals that country's restriction is used in process of production, the Exquisite kraft paper of production also meets the quality requirement of packaging for foodstuff body paper except that meeting ordinary packing with the paper use; Adopt the hydrogen peroxide bleaching technology, do not produce in process of production and be difficult to biodegradable organohalogen compounds (AOX), have the advantage that realizes cleaner production.

The specific embodiment:

The production method of embodiment 1 is as follows:

Masson pine, 15% China fir, 25% the multiple broadleaf fibrous raw material that uses over dry mass ratio 60% can mix in pulping process or independent slurrying through getting the raw materials ready, kraft cooking, washing sieve, produce sulfate true qualities wood pulp; The true qualities wood pulp mixes the back and produces little wood pulp that floats by oxygen delignification and hydrogen peroxide bleaching, oxygen delignification slurry concentration 7%, 70 ℃ of temperature, oxygen is pressed 310Kpa, 40 minutes time, bleaching slurry concentration 10%, hydrogen peroxide consumption 1% (to the absolute dried paper pulp weight ratio), bleaching pH value 10.5; Little wood pulp whiteness 24% of floating, slurry be in beating consistency 3.5% time making beating, 28 ° of SR of beating degree, weight in wet base: 12.5g, the slurry after the making beating through desanding, condiment, pressurized screen fine screen, go up net forming, squeezing, drying, batch, rewinding, packing form.

The Exquisite kraft paper of Sheng Chaning quantitatively is 40g/M after tested ², burst index 1.9KPam ²/ g, surface absorption 40g/M ², whiteness 21.5%, moisture 9%, lead content (in Pb) 0.39mg/kg, arsenic content (in As)＜0.2mg/kg, fluorescent substance 254nm and 365nm and Decolorant Test (water, n-hexane) are all negative, every 100g coliform＜30, do not detect pathogenic bacteria.

The production method of embodiment 2 is as follows:

Masson pine, 5% China fir, 15% the multiple broadleaf fibrous raw material that uses over dry mass ratio 80% can mix in pulping process or independent slurrying through getting the raw materials ready, kraft cooking, washing sieve, produce sulfate true qualities wood pulp; The true qualities wood pulp mixes the back and produces little wood pulp that floats by oxygen delignification and hydrogen peroxide bleaching, oxygen delignification slurry concentration 12%, 90 ℃ of temperature, oxygen is pressed 500Kpa, 60 minutes time, bleaching slurry concentration 12%, hydrogen peroxide consumption 12% (to the absolute dried paper pulp weight ratio), bleaching pH value 11; Little wood pulp whiteness 34% of floating, slurry be in beating consistency 4% time making beating, 32 ° of SR of beating degree, weight in wet base: 15g, the slurry after the making beating through desanding, condiment, pressurized screen fine screen, go up net forming, squeezing, drying, batch, rewinding, packing form.

The Exquisite kraft paper of Sheng Chaning quantitatively is 70g/M after tested ², tear index 8.5mNm ²/ g, burst index 2KPam ²/ g, surface absorption 45g/M ², whiteness 30%, moisture 7%, lead content (in Pb) 0.36mg/kg, arsenic content (in As)＜0.2mg/kg, fluorescent substance 254nm and 365nm, and Decolorant Test (water, n-hexane) is all negative, every 100g coliform＜30, does not detect pathogenic bacteria.

The production method of embodiment 3 is as follows:

The masson pine, 40% multiple broadleaf fibrous raw material of using over dry mass ratio 60% can mix in pulping process or independent slurrying through getting the raw materials ready, kraft cooking, washing sieve, produce sulfate true qualities wood pulp; The true qualities wood pulp mixes the back and produces little wood pulp that floats by oxygen delignification and hydrogen peroxide bleaching, oxygen delignification slurry concentration 10%, 80 ℃ of temperature, oxygen is pressed 400Kpa, 55 minutes time, bleaching slurry concentration 11%, hydrogen peroxide consumption 11% (to the absolute dried paper pulp weight ratio), bleaching pH value 10.8; Little wood pulp whiteness 30% of floating, slurry be in beating consistency 3.8% time making beating, 30 ° of SR of beating degree, weight in wet base: 12g, the slurry after the making beating through desanding, condiment, pressurized screen fine screen, go up net forming, squeezing, drying, batch, rewinding, packing form.

The Exquisite kraft paper of Sheng Chaning quantitatively is 120g/M after tested ², tear index is not less than 8.6mNm ²/ g, burst index 2.1KPam ²/ g, surface absorption 38g/M ², whiteness 26%, moisture 10%, lead content (in Pb) 3mg/kg, arsenic content (in As) 0.8mg/kg, fluorescent substance 254nm and 365nm and Decolorant Test (water, n-hexane) are all negative, every 100g coliform＜30, do not detect pathogenic bacteria.

Claims

1, a kind of Exquisite kraft paper is characterized in that: quantitative 40-120g/M ², burst index is not less than 1.7KPam ²/ g, water absorbent surface 25-45g/M ², whiteness 21.5-30%, moisture 6-11%, lead content (in Pb)≤3mg/kg, arsenic content (in As)≤0.8mg/kg, fluorescent substance 254nm and 365nm and Decolorant Test (water, n-hexane) are all negative, every 100g product coliform≤30.

2, according to the production method of the described Exquisite kraft paper of claim 1, fibrous raw material is through getting the raw materials ready, boiling, washing sieve, make slurry after bleaching, 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: use the over dry mass ratio to be not less than 60% masson pine, be no more than 15% China fir, be no more than 40% leaf wood raw material and mix or produce sulfate true qualities wood pulp separately; The true qualities wood pulp mixes the back and produces little wood pulp that floats by oxygen delignification and hydrogen peroxide bleaching, oxygen delignification slurry concentration 7-12%, temperature 70-90 ℃, oxygen is pressed 300-500Kpa, bleaching slurry concentration 8-12%, hydrogen peroxide consumption 1-2% (to the absolute dried paper pulp weight ratio), bleaching pH value 10.5-11; Little wood pulp whiteness 24-34% that floats, beating consistency 3.5-4.0%, beating degree 26-34 ° SR, weight in wet base: 10-15g.