69results about How to "Low kappa" patented technology

The invention discloses a microwave-assisted preparation method of bagasse bleached pulp, which is a method for clean and high-efficient preparation of bagasse bleached pulp by microwave radiation technology. The method comprises: performing microwave heating and water extracting treatment of air-dried bagasse raw materials, repeatedly soaking and cleaning the treated materials with deionized water to be neutral, then performing dehydration and dispersion, rapidly determining the water content of the dispersed materials, then performing delignification treatment of the materials with a known water content by sodium hydroxide / hydrogen peroxide / anthraquinone, finally soaking, dispersing and washing the treated pulp to be neutral, removing excessive water, and sealing to obtain the bagasse bleached pulp. The bagasse bleached pulp prepared by the method is milk white or in a white fiber form, low in paper pulp kappa number, high in whiteness, and moderate in viscosity.

The invention discloses an ECF bleaching technology of fast growing poplar by a sodium hydroxide anthraquinone pulp bio-chemical method. The ECF bleaching technology is characterized by comprising the following steps: (1) boiling: taking fast growing poplar chips, stewing the fast growing poplar chips in a digester to obtain virgin pulp, washing, and screening to obtain paper pulp; (2) xylanase pretreatment; and (3) ECF bleaching: bleaching the above paper pulp which has undergone enzyme treatment, wherein the bleaching process is one of three bleaching processes, namely ODQP, OPDQP or O1O2PDQP. According to the invention, xylanase is used to pretreat the paper pulp, and one of the three bleaching processes, namely ODQP, OPDQP or O1O2PDQP, is carried out for bleaching so as to obtain the paper pulp with higher whiteness and viscosity. In comparison with paper pulp which is directed bleached without xylanase pretreatment, the paper pulp produced by the ECF bleaching technology has the following advantages: beating whiteness loss is less, folding strength is averagely higher by 30 times, burst index is averagely higher by 0.35N.m.g<-1>, breaking length is averagely higher by 0.25KM, and tear index difference is basically unchanged or slightly reduced by a very small magnitude.

The invention relates to an antibacterial paper towel and a preparation method thereof, and discloses a process for papermaking by using Qianjinfang medicine residue, wherein the process comprises: microwave pretreatment, fermentation, washing, paper making, extracting of medicinal ingredients from waste liquid, paper modification and the like. According to the present invention, the short fiber is prepared by using the Qianjinfang medicine residue, and the long fiber property of the cotton fiber is combined, such that the prepared antibacterial paper towel has good tensile property; the prepared antibacterial paper towel has remarkable wet strength through internal sizing and surface application; by using the microwave radiation method and the biological method, harmful chemicals are notintroduced during the whole process, such that the hygienic characteristics of the paper are ensured; and the medicinal ingredients are extracted from the pulping waste liquid, and are mixed with thebase medicine liquid component comprising Cortex Ailanthi, Sophora flavescens Ait, Cortex Moutan, frankincense and borneol, and the obtained mixture is applied on the paper, such that the obtained antibacterial paper towel has good anti-inflammatory and antibacterial effects, can prevent microbial infection, does not have irritation and side effects on the skin and vaginal mucosa, and is suitablefor women.

The invention relates to a pulping method of a reed organic solvent slurry by pre-extracting hemicellulose and a product thereof. The method includes: reed preparation, prehydrolysis, solid-liquid separation and washing, and pulp preparation by a high boiling alcohol solvent method from residues. The method can obtain a reed pulp and a reed extracting liquid which can be used for preparation of saccharide compounds or ethanol. Compared with the reed raw material which is not subjected to hemicellulose extraction by hydrolysis, the Kappa number of the slurry obtained under the same pulping conditions is reduced by 5-8 units after the reed is subjected to prehydrolysis. By prehydrolysis to extract hemicellulose before pulping, the problem of high sugar content in a high boiling alcohol solvent recovery system can be solved, and effective utilization of all components of wood biomass raw materials also can be realizes, so that the added value of a byproduct is improved, and the economic costs of high boiling solvent alcohol pulping are balanced.

The invention discloses a method for cooking and pulping pinus khasys by using a propylene glycol organic solvent. According to the method, a special wood fiber raw material pinus khasys of Yunnan is adopted and is cooked and pulped by using a propylene glycol solvent, citric acid and sulfuric acid. Paper pulp prepared by the method disclosed by the invention has the characteristics of high yield, high viscosity, good strength and good paper pulp whiteness.

The invention discloses a TCE (Total Chlorine-Free) bleaching technology for sulfate pulp of growing poplar by biological chemical method. The technology comprises the following steps: (1), cooking: getting fast-growing polar pieces; putting the fast-growing polar pieces into a distilling pan for cooking, so as to obtain primary pulp, and then washing and screening the primary pulp to obtain paper pulp; (2), pre-treating the paper pulp with xylanase; (3), TCE bleaching: bleaching the paper pulp pre-treated with the xylanase, wherein the bleaching process is one of OP-Q-P, O1-O2P-Q-P or O1P-O2P-Q-P. According to the TCE (Total Chlorine-Free) bleaching technology for sulfate pulp of growing poplar by biological chemical method, the xylanase is adopted to pre-treat the paper pulp, then one of the bleaching processes OP-Q-P, O1-O2P-Q-P or O1P-O2P-Q-P is adopted for bleaching, so that the paper pulp with higher whiteness and viscosity is obtained; compared with the paper pulp obtained through directly bleaching without xylanase pre-treatment, the paper pulp provided by the invention has the advantages that the loss value of whiteness is lesser, the folding strength is higher 45 times averagely, the bursting index is higher 0.45 N*m*g <-1> averagely, the breaking length is higher 0.35 KM, and the tearing index is quite. The beating revolution number is lesser when the paper pulp reaches the same or similar beating degree, and the 20% of beating energy consumption can be saved approximately.

The invention belongs to the field of a papermaking technology, and in particular relates to a papermaking stewing accessory ingredient. The papermaking stewing accessory ingredient is prepared by the raw materials which comprise, by weight, 25-35 parts of sodium dodecyl benzene sulfonate, 15-30 parts of alkyl glucosides, 5-10 parts of poly aspartic acid, 10-16 parts of anthrahydroquinone, 5-12 parts of sodium polysulfide and 120-180 parts of deionized water. The invention further provides a preparation method of the papermaking stewing accessory ingredient. By means of the papermaking stewing accessory ingredient, the amount of alkali used for stewing is greatly reduced, the stewing time is shortened, the stewing temperature and the hardness of paper pulp can be lowered, the quality of the pulp is improved in all aspects, the yield of the pulp is improved, a pipeline is effectively prevented from forming scales, and continuous production is guaranteed.

Belonging to the technical field of pulping, the invention relates to a method of cooking pulping by preimpregnation of dendrocalamus giganteus in a propylene glycol organic solvent. The method includes: firstly splitting dendrocalamus giganteus into bamboo segments that are 2cm-3cm long and have a width of less than 3cm to serve as the pulping raw materials; adding the pulping raw materials into a propylene glycol analytically pure reagent to conduct preimpregnation, and then performing separation to obtain an impregnated material; adding a pulping agent into the impregnated material, then putting the mixture into a chain oil bath cooking pan, and separating the slurry and the waste liquid at the end of cooking; washing the separated slurry and then subjecting the slurry to screening in a pulp screener to obtain clean dendrocalamus giganteus paper pulp; adding cold water into the waste liquid to carry out dilution standing and centrifugal separation, performing microfiltration with a microfiltration membrane, conducting ultrafiltration with an ultrafiltration membrane, implementing reduced pressure distillation to remove water, and then using the obtained solution to replace the propylene glycol analytically pure reagent to serve as the preimpregnation reagent. The paper pulp prepared by the method has the advantages of high yield, high viscosity, high whiteness and good strength.

The invention relates to paper prepared from forestry and agricultural waste and a method thereof, and discloses a technology for preparing fiber through the forestry and agricultural waste. The technology comprises the steps of spiral squeezing processing, biological enzyme fermenting, papermaking, paper modifying and the like. The forestry and agricultural waste serves as raw materials for preparing fiber, then through the cooperation of ultrasonic waves and biological enzymes, the prepared fiber has high yield, high whiteness and a low kappa number, in the whole process, no harmful chemicalproducts are introduced, and the hygiene of the fiber is ensured. Since graphene dispersion liquid is added in the pulping process, the obtained product has high electric conduction and antibacterialperformance, and particularly has an effect of effectively inhibiting and killing staphylococcus aureus, escherichia coli and hemolytic streptococcus.

The present invention discloses an application of sodium tripolyph-osphate as protecting auxiliary in the oxygen delignification bleaching, and by weight percentage, the dosage of the sodium tripolyph-osphate of the protecting auxiliary is 0.1 percent to 0.5 percent. Compared with the prior universal protecting auxiliaries, such as bitter salt, the kappa value of the sodium tripolyph-osphate applied as the protecting auxiliary of oxygen delignification is low, that is, the delignification rate is high, exceeding 50 percent, while whiteness and viscosity are the highest, so the sodium tripolyph-osphate applied by the present invention, the protecting auxiliary of oxygen delignification, has the better effect than the bitter salt used as the protecting auxiliary of oxygen delignification, and while the sodium tripolyph-osphate protects carbohydrate, lignin is removed as much as possible. The environmental pollution is reduced. Using sodium tripolyph-osphate as the protecting auxiliary of oxygen delignification can increase the delignification rate, thus reducing the subsequent dosage of bleaching chemicals and therefore also reducing the pollution load of bleaching wastewater.