73 results about "Chemical pulp" patented technology

The invention relates to a chemical pulping, cooking and washing control method based on an ACE technology and a storage medium, the method comprises the following steps: collecting process parameter data of a chemical pulping, cooking and washing process, the process parameter data comprising cooking temperature, cooking pressure, pH value, cooking time, liquid ratio, additive concentration, steam flow and liquid level; preprocessing the collected process parameter data, wherein the preprocessing comprises data screening and data filtering; identifying time delay among the process parameter data in the chemical pulping, cooking and washing process; constructing a high-precision multivariable model, and capturing strong nonlinearity and coupling among process parameter data in the chemical pulping, cooking and washing process; and generating an optimal adjustment strategy of the process parameter data of the required target through the multivariable prediction control model. And the influence of single variable adjustment on other variables is avoided, so that the large loss of the production process in the aspects of yield, quality and energy consumption is reduced.

The invention discloses environment-friendly high-barrier packaging paper and a preparation method thereof, and belongs to the technical field of paper product manufacturing. The method comprises the following steps: dispersing bleached sulfate softwood pulp in an aqueous solution of TEMPO and NaBr, adding a NaClO solution, adjusting the pH value, carrying out a reaction, washing the product obtained by the reaction, and carrying out high-pressure homogenization to obtain TEMPO oxidized nanocellulose (TOCNF); mixing the bleached sulfate softwood chemical pulp, hardwood pulp and viscose fibers, pulping, papermaking and the like to obtain original paper; then, TOCNF and waterborne epoxy modified acrylic emulsion are mixed, and a mixed coating is prepared; and finally, coating the surface of original paper with the coating according to a certain mass ratio, and carrying out hot-pressing curing to obtain the environment-friendly high-barrier packaging paper. The packaging paper is excellent in mechanical property, high in barrier property, good in surface uniformity and printing property, environment-friendly and degradable in raw materials, simple to prepare and low in cost.

The invention discloses a method for preparing high-quality dissolving pulp from low-grade plant fiber raw materials, and belongs to the technical field of biomass pulping. The preparation method comprises the following steps: screening a low-grade plant fiber raw material to obtain a fiber raw material of which the length is 20-30 mm, the width is 10-15 mm and the thickness is 3-5 mm; carrying out deep prehydrolysis-sulfate cooking treatment on the screened fiber raw materials to obtain unbleached sulfate pulp fibers; performing deep eutectic solvent and elemental chlorine-free bleaching treatment on the unbleached sulfate pulp fiber to obtain paper pulp fiber with low kappa number; and carrying out biological enzyme treatment on the paper pulp fibers with low kappa number to obtain the high-quality dissolving pulp. According to the method, the morphology and the structure of chemical pulp fibers are effectively regulated and controlled by designing deep eutectic solvent treatment, and deep dissolution of residual hemicelluloses and lignin is achieved; through biological enzyme treatment, the alpha-cellulose content and the Fock reaction performance are further improved, and finally the high-quality dissolving pulp is prepared.

The invention provides a paperboard and a preparation method thereof. The preparation method comprises the steps that paper pulp is prepared, the paper pulp comprises core layer paper pulp, face lining layer paper pulp, face layer paper pulp and bottom layer paper pulp, and microfibrillated cellulose and chemical pulp are added to at least one of the face lining layer paper pulp and the bottom layer paper pulp to be ground together before grinding; making raw paper from the paper pulp; and coating surface glue on the surface of the surface layer of the body paper. According to the preparation method of the paperboard provided by the embodiment of the invention, the adding point of the MFC applied to the high-speed paper machine system is determined, the influence on the paper machine system is reduced, and dehydration of the pulp and operation of the paper machine are ensured. By combining the papermaking characteristics of a multi-layer paper machine, the surface lining layer and the bottom layer applied to the paper sheets can effectively improve the interlayer bonding strength between the paper sheets, improve TV-16, reduce the use amount of spraying starch in the conventional process or cancel the spraying starch, and improve the operation of the paper machine.

The invention discloses an chemi-mechanical pulp production method capable of improving the filtration property of chemi-mechanical pulp, and relates to the technical field of papermaking, high-concentration grinding freeness is optimized to 640 + / -30ml, pulp fine fibers can be controlled at 22%-33%, the tensile index middle-lower limit and the bulk middle-upper limit, the high-concentration grinding effect is improved, the effect between fibers is facilitated, the effect between the fibers and a grinding sheet is reduced, and the filtration property of the chemi-mechanical pulp is improved. Fiber cutting is reduced, and the content of pulp fine fibers is reduced; the MSD torque is increased to 250 + / -10 KNM, the tearing effect of wood chips is improved, the preimpregnation reaction of the wood chips is facilitated, the original fine content is controlled to 26%-29% from original 22%-33%, the pulp bulk is increased by about 0.1 cm < 3 > / g, and the tensile index is increased by 1.0 N.m / g; the four low-concentration grinders are changed into parallel connection, so that the residence time of pulp in the low-concentration grinders is prolonged, the cutting effect of the pulp ground by the low-concentration grinders on fibers is reduced, light friction between grinding sheets and the fibers is increased, fibrillation of the fibers is facilitated, the bulk and the tensile strength are improved to a certain extent, and under the content of fine fibers, the size of the fibers is reduced. And the bulkiness and the tensile index of the finished pulp are also improved to a certain extent.

The present application relates to pulping technology field, the present application provides a kind of high-strength high-cleanliness chemical pulp's pulping process, with bamboo willow edge scrap as fiber raw material, after 1 stage pre-steaming, chip washing, dehydration, 2 stage pre-steaming;The wood chip material after 2 stage pre-steaming is 1 stage extrusion and is dissolved, 1 stage chemical liquid pre-impregnation, 2 stage extrusion and is dissolved, 2 stage chemical liquid pre-impregnation;1 stage chemical liquid pre-impregnation uses sodium hydroxide solution and does not use hydrogen peroxide, the chemical reagent of 2 stage chemical liquid pre-impregnation process is sodium hydroxide, hydrogen peroxide and sodium silicate;Material after 2 stage chemical liquid pre-impregnation is 1 stage refining, separation, cooling, 1 stage high-concentration bleaching, 1 stage dehydration, 2 stage high-concentration bleaching, 2 stage dehydration;Pulp after 2 stage dehydration is latent, refining etc., and the finished product is prepared.This application process can produce high-strength, high-cleanliness chemical pulp, and the pulp cost is lower, and the pulp quality is better, and it is beneficial to high-end cultural paper etc. application.

The present invention relates to a glass paper for stripping interleaving paper, wherein the majority of the fiber ingredients are non-regenerated bleached chemical pulp from hardwood such as birch or eucalyptus. A small amount of recycled pulp produced from release liner glass paper and / or pulp mill broke is used to adjust the characteristics of the fiber ingredients. The invention makes it possible to produce cellophane, wherein the fibrous ingredients do not contain non-recycled chemical pulp produced from cork.

The invention discloses a preparation method of all-bamboo fiber basic color paper cup body paper and a product thereof, and the preparation method comprises the following steps: mechanically grinding bamboo chemical pulp fibers and bamboo chemical thermo-mechanical pulp fibers as raw materials, carrying out biological treatment on the bamboo chemical thermo-mechanical pulp fibers by using laccase / mediator, and preparing the paper cup body paper by adopting a three-layer composite papermaking process. The paper cup body paper is composed of a surface layer (bamboo chemical pulp), a core layer (bamboo chemical thermo-mechanical pulp treated by laccase / ABTS) and a bottom layer (bamboo chemical pulp), and aluminum sulfate, rosin size and CPAM are added in the papermaking process. The technical problems that the production cost is high due to the fact that traditional unbleached paper cup body paper depends on wood pulp, and bamboo pulp fibers are difficult to give consideration to high bulkness and high strength are solved, the raw material cost is low, the production process is environmentally friendly, the product has excellent physical strength, bulkness and water resistance, wood resource consumption can be reduced, and sustainable development of the papermaking industry is promoted.

1. The name of the design product: whiteness tester. 2. The use of the design product: for measuring the whiteness of paper and paperboard, pulp and chemical pulp, cotton and chemical fiber, textiles, plastics, ceramics, porcelain, starch, salt, white cement, porcelain clay, talc, calcium carbonate, nano calcium carbonate and other objects. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best shows the design points: perspective view.

The application belongs to the field of increasing the water retention value of chemical pulp waste paper fibers, and discloses a method for efficiently increasing the water retention value of chemical pulp waste paper fibers, which comprises the following preparation steps: firstly, mixing chemical pulp waste paper fibers with pentaerythritol; then, adding a certain amount of acetylcholine and acetic acid in sequence; after being mixed uniformly, heating treatment is performed, the pretreatment temperature and time are controlled, and after the treatment is completed, an ethanol solution is added to terminate the reaction, so that modified waste paper pulp fibers are obtained. The application has the advantages of short time, simple process, mild conditions, simple steps, easy operation and suitability for industrial production.

The useful solution refers to the technology for manufacturing waterproof and heat-resistant paper (brown paper) used in food processing, including the following steps: (i) Pulp pulverization; (ii) Pulp grinding; (iii) Mixing of chemical additives; (iv) Paper making; (v) Paper surface treatment; (vi) Paper drying. The resulting product possesses excellent oil and water resistance and stable heat resistance during food processing (baking, frying, steaming, etc.); while also ensuring food safety standards according to current regulations, minimizing the risk of unwanted substances leaching during use.

The invention discloses a preparation method of coated gift packaging paper. The preparation method comprises the following operation steps: S1, pulping: respectively pulping bleached sulfate softwood chemical pulp, bleached sulfate broadleaf wood chemical pulp and alkaline hydrogen peroxide bleached poplar chemimechanical pulp, and mixing to form mixed pulp; s2, auxiliary material adding, wet paper sheet forming and pre-drying; s3, coating and sizing are conducted, specifically, the front face and the back face of the paper sheet are coated with a coating respectively, and the coating comprises coating-grade light calcium carbonate, coating-grade talcum powder, a dispersing agent, sodium hydroxide, modified acrylic copolymer emulsion, polyvinyl acetate latex, coating starch, sodium carboxyl cellulose, a lubricating agent and a defoaming agent; s4, carrying out post-drying and carrying out super-soft calendering treatment by adopting eight rollers and seven pressing areas; the invention also provides the coated gift packaging paper prepared by adopting the preparation method, the smoothness of the coated gift packaging paper is greater than 1200s, the roughness of the coated gift packaging paper is less than 1.2 microns, and the coated gift packaging paper completely meets the requirements of the coated gift packaging paper for absorbing and drying gravure or flexographic printing water-based ink.

The invention discloses a pulping method of bleached chemical pulp, which comprises the following steps: (A) adjusting the concentration of pulp after cooking reaction with water, and adding bio-enzyme and oxidizing compound for oxygen removal reaction to obtain pulp after oxygen delignification; (B) bleaching the paper pulp subjected to oxygen delignification with chlorine dioxide to obtain bleached paper pulp; (C) carrying out alkali extraction on the bleached paper pulp to obtain the bleached chemical pulp, the biological enzyme is one or more of xylanase, hemicelluloses hydrolase, laccase, fiber oxidase, lignin peroxidase and multifunctional peroxidase. According to the method, specific bio-enzyme is added in an oxygen removal section, a common oxygen removal section is converted into bio-enzyme and oxygen bleaching delignification, delignification of a rear section is selectively improved, the load of front-section cooking can be released, the use amount of caustic soda for oxygen removal and cooking is reduced, and the production cost is reduced. Meanwhile, the oxygen removal efficiency, the subsequent bleaching efficiency and the sustainable production level of the paper pulp can be improved.

The invention relates to the technical field of boarding kraft paper, in particular to a preparation process of boarding kraft paper. Comprising the following steps: step 1, adding softwood sulfate bleached chemical pulp, broadleaf wood sulfate bleached chemical pulp and coffee grounds into deionized water for repulping treatment and pulping, then adding an additive for papermaking treatment, coating latex for coating, and drying to obtain pretreated kraft paper; step 2, soaking the pretreated kraft paper in deionized water added with a softening agent, washing for 1-2 hours, drying, adding a specially-made auxiliary material into a machine, carrying out first-time grain kneading, airing, adding the specially-made auxiliary material into the machine, carrying out second-time grain kneading, rolling, carrying out quality inspection, and packaging; therefore, the boarding kraft paper is obtained.

The invention provides carboxymethylated bamboo pulp reinforced composite paper and a preparation method thereof. The BCTMP is subjected to carboxymethylation modification by adopting an alkalization-etherification method, and compared with unmodified BCTMP, the prepared carboxymethylated bamboo wood chemithermomechanical pulp (CM-BCTMP) has the advantages that the fiber softness, the hydrophilicity and the inter-fiber binding capacity are remarkably improved. After the modified bamboo pulp and the unbleached sulfate wood pulp are mixed according to the proportion of 5: 5, the tensile index of finished paper is increased by 70% or above, the burst index is increased by 30% or above, the bottleneck problem that the paper strength is sharply reduced due to high-proportion bamboo pulp mixing is successfully solved, and a new way is provided for preparing a low-cost and high-strength paper-based material.

The invention relates to a light lining board for a corrugated board. The present invention relates to a lightweight liner for a corrugated board, which has good strength properties and reduces the problem of wave-shaped shrinkage in the corrugated board produced therefrom. The liner of the invention comprises at least one sheet layer comprising 20-80% by weight of CTMP from wood fibers and 20-80% by weight of chemical pulp, all percentages being calculated based on the total fiber weight of the first sheet layer wherein the CTMP exhibits a bulk of at least 2.5 cm3 / g.

The application provides a white card paper and a base paper thereof, the base paper comprising: a surface layer, a core layer and a bottom layer which are sequentially stacked; wherein the pulp of the core layer comprises wood pulp, ground calcium carbonate and white mud light calcium carbonate; wherein the wood pulp comprises 50-95% by mass of mechanical pulp and 5-50% by mass of chemical pulp; the mass fraction of the ground calcium carbonate is 10-50%, and the mass fraction of the white mud light calcium carbonate is 10-50%. The base paper of the white card paper provided in the application can improve bulk, improve sizing efficiency, improve ash retention, reduce abrasion and has great market application value by mixing a certain amount of white mud light calcium carbonate which can be obtained at low cost into the pulp.

The invention relates to an energy-saving and emission-reducing production process and process method for alkaline chemical pulping, which belongs to the technical field of pulping, cooking and washing, and adopts the technical scheme that a dipping pot, a cooking pot, a pulp washing pot, a washing tank and the like are connected with a pulp pump, a valve and a pipeline through a vacuum and compressed air system; the method has the beneficial effects that the high-concentration and high-temperature black liquor is directly extracted from the steamer and sent to the alkali recovery evaporation section, the black liquor is firstly reduced to the temperature required by evaporation through flash evaporation, and secondary steam is reused for production, so that the evaporation steam consumption is greatly reduced; the steam produced by alkali recovery can meet the requirements of evaporation, causticization and cooking, and the residual steam can be used by other workshops; real zero emission of bamboo and wood pulping wastewater is realized, and ultralow emission of straw pulping wastewater is realized; the amount of water for washing the bamboo wood pulp is 0 (clear water), and the amount of water for washing the straw pulp is ultra-low; the two problems of water pollution and high energy consumption of alkaline pulping are solved satisfactorily.

The present invention relates to a paperboard having improved light barrier properties, comprising at least three plies; a top layer sheet and a back layer sheet; and a middle layer sheet. The top sheet comprises at least 80 wt% of a chemical pulp. The intermediate plies comprise at least 40 wt% of CTMP from spruce, calculated based on the total fiber weight of the respective plies, wherein the CTMP from spruce has a brightness of between 40 and 60 according to ISO 2470-1: 2016. The back layer sheet comprises at least 80 wt% of an unbleached hardwood or softwood kraft pulp, calculated based on the total fiber weight of the back layer sheet, wherein a) if the unbleached kraft pulp in the back ply is from hardwood, this hardwood unbleached kraft pulp exhibits a Kappa number according to ISO 302: 2015 of at least 15, b) if the unbleached kraft pulp in the back ply is from softwood, this softwood kraft pulp exhibits a Kappa number according to ISO 302: 2015 of at least 20. The invention also relates to a packaging material, a liquid packaging container made of said packaging material and a method of manufacturing a paperboard.

The invention discloses an chemi-mechanical pulp transfer screw press suitable for double bleaching towers, and relates to the technical field of chemi-mechanical pulp treatment equipment, a rotating shaft is arranged in the transfer screw press, the diameter of the rotating shaft is obliquely arranged from small to large from left to right, and a spiral stirring blade is fixed on the rotating shaft; the feeding mechanism is arranged on the upper left portion of the two transfer screw press bodies. The dehydration mechanism is connected with the two transfer screw press bodies; the pushing mechanism is connected with the squeezing pipe; the first mounting frame is arranged between the pushing mechanism and the squeezing pipe; the rapid switching of the feeding pipelines is realized, and the continuous dehydration operation of the chemi-mechanical pulp in the double-bleaching-tower system is ensured; online cleaning during blockage is facilitated, and the downtime is shortened; accumulated slurry is thoroughly removed, and residues are prevented from affecting the subsequent process; the two sets of independent transfer screw press bodies are arranged, flexible switching is achieved through the material distribution mechanism, it is ensured that the system can still operate continuously when a single machine is maintained or cleaned, and the overall operation continuity is improved.

The invention belongs to the technical field of papermaking, and discloses a manufacturing method of body paper suitable for rotary digital printing and bar code label paper. The manufacturing method comprises the following steps: by taking bleached sulfate needlebush chemical pulp and needlebush hot-ground chemimechanical pulp as fiber raw materials, mixing the bleached sulfate needlebush chemical pulp and the needlebush hot-ground chemimechanical pulp in a weight ratio of (20-40%): (60-80%) to form mixed pulp; the raw paper suitable for rotary digital printing is prepared through sizing, pulp screening, pulp flowing, net part dehydration forming, drying and specific surface coating; carboxymethyl cellulose salt with the substitution degree of 1-1.3 is added between the sizing step and the pulp screening step, and the dosage is 3-5 kg / t paper. The prepared paper product has an excellent ink fixing effect, is high in longitudinal and transverse tearability, has excellent printing processing performance, is relatively low in cost, and can be used as bar code label paper.

The invention relates to the field of papermaking, and particularly provides a light-weight paper-based material reinforcing method which comprises the following steps: S100, pulping bleached chemical pulp, adding a reinforcing agent, and carrying out papermaking on a net to obtain finished paper; s200, the surface of finished paper is coated with the polyvinyl alcohol / nanocellulose coating, and after drying treatment, a paper-based material is obtained; s300, carrying out calendering treatment on the paper-based material to obtain a light-weight paper-based material; wherein the reinforcing agent comprises a dry strength agent and a wet strength agent. According to the invention, multi-dimensional synergistic enhancement is adopted, so that the light weight of the paper is ensured, and meanwhile, the dry and wet strength, the surface performance and the overall structure compactness of the paper are remarkably improved.

The invention discloses a wood nanocellulose hydrophobic oil-resistant agent as well as a preparation method and application thereof, and belongs to the technical field of oil-resistant agent preparation. According to the preparation method of the wood nanocellulose hydrophobic oil-resistant agent provided by the invention, a hydrogen bond acceptor, a Bronsted acid donor and a Lewis acid metal salt are adopted to construct a ternary eutectic solvent, a lignin network in chemi-mechanical pulp is cooperatively cracked, and a catalytic environment is provided; synchronously adding chemi-mechanical pulp and a bio-based modifier coumaric acid-phytosterol ester into the solvent, and integrally completing in-situ nanocrystallization dissociation and surface hydrophobic esterification functionalization of the fibers in an inert atmosphere; and carrying out shearing dispersion assisted by dihydrolevoglucosenone, centrifugal purification and reduced pressure distillation on the reaction mixture to obtain the wood nanocellulose hydrophobic oil-resistant agent. According to the method, synchronous construction of efficient nano dissociation and a modified catalytic environment of the chemi-mechanical pulp is achieved through the ternary eutectic solvent, a nano-crystallization-hydrophobic oil-resistant modification integrated process is achieved, toxic and harmful substances are avoided, and the method is green and environmentally friendly.

The application discloses a chemical pulp grinding steam recovery method and system. The chemical pulp grinding steam recovery system comprises a grinding steam conveying pipeline, a grinding steam ejector, a primary evaporation tank and a forced evaporation tank; the grinding steam ejector comprises a first input end connected with an output port, receives grinding steam to be recovered and pressurizes the grinding steam; the primary evaporation tank and the forced evaporation tank are connected with the output end of the grinding steam ejector through a steam header, and the pressurized grinding steam is input into the primary evaporation tank and the forced evaporation tank through the steam header to exchange heat and then condense. The design makes the grinding steam to be recovered not directly sent into the intermediate evaporation tank for heat exchange, but pressurized through the grinding steam ejector, enters the primary evaporation tank and the forced evaporation tank through the steam header for the first round of heat exchange, thereby avoiding the problems that the intermediate evaporation tank is seriously covered with fiber scale and the load of the grinding steam is limited.

The invention relates to a multi-ply containerboard for corrugated board, said multi-ply containerboard comprising a first outer ply, a second outer ply, and at least one intermediate ply sandwiched between the first and second outer ply, wherein the first and second outer ply comprise at least 70 wt-%, based on dry weight, of neutral sulphite semi-chemical (NSSC) pulp, and wherein the intermediate ply comprises at least 30 wt-%, based on dry weight, of unbleached kraft pulp and at least one cellulose-based strength enhancer, and wherein the intermediate ply comprises less than 30 wt-%, based on dry weight, of NSSC pulp.

The present application discloses a method for manufacturing high-strength impregnation-dyed base paper, comprising the following steps: S1, using bleached kraft softwood chemical pulp and insoluble polyacrylamide fiber as fiber raw materials for papermaking; S2, subjecting the product obtained in step S1 to sequential processing through a thick stock screen, seasoning, pulping, sand removal and degassing, sizing, paper machine screen, headbox, fourdrinier paper machine wire section dehydration and forming, pressing, drying, calendering, winding, and packaging to produce the high-strength impregnation-dyed base paper. The product produced by the method for manufacturing high-strength impregnation-dyed base paper provided in the present application has excellent air permeability and ink absorbency, excellent thickness and softness, good uniformity, excellent burst index and breaking length, good wet strength, and strong mechanical properties during dyeing.

The invention provides a tail pulp recovery and reproduction process and application thereof, and relates to the technical field of pulping and papermaking production. The tail pulp recovery and reproduction process comprises the following steps: S1, pretreatment: mixing tail pulp with a surfactant, adding xylanase, and performing secondary mixing to obtain pretreated tail pulp; s2, softening: mixing the pretreated tail pulp obtained in the step S1 with an enzyme preparation to obtain softened pulp; the enzyme preparation is a mixture of keratinase, lignin peroxidase and galactosidase; s3, pulp grinding: concentrating the softened pulp obtained in the step S2 until the concentration is 18%-25%, and performing graded pulp grinding to obtain ground pulp; and S4, shoving: shoving the ground slurry obtained in the step S3 until the dryness is 45-65% to obtain the slurry. The prepared paper pulp is good in physical performance and high in strength, and the method is provided for recycling of the tail pulp of the chemical pulp.

The application discloses a preparation method of a paper suitable for intaglio printing and brush writing, and comprises the following steps: step (1), pulp preparation: bleached kraft softwood chemical pulp and bleached kraft hardwood chemical pulp are proportioned at a ratio of 5-10% and 90-95%; step (2), beating: the NBKP beating degree is controlled to be 38-48SR to provide good fiber bonding force and paper strength; the LBKP beating degree is controlled to be 25-35SR to provide excellent paper forming uniformity, smoothness and softness; step (3), sizing: carboxymethyl modified starch is added to the pulp before a paper machine pressure screen; step (4), pulp washing, sand and gas removal and sizing: step (5), fine screening, net section dewatering forming, pressing and pre-drying, to obtain raw paper: step (6), surface coating. The paper prepared by the method has excellent printing performance, excellent writing experience and excellent comprehensive quality, and the process is advanced.

The invention provides a dyeing process of bleached sulfate paper pulp and a paperboard containing a bleached sulfate paper pulp layer, and the dyeing process is as follows: under certain conditions, bleached sulfate paper pulp and direct dye are subjected to a circulating contact dyeing reaction in water, and coloring pulp is obtained through forming. The dyeing process can achieve a specific coloring effect, and is short in dyeing time, good in color fastness, small in dye consumption, small in dye loss after dyeing and environment-friendly. The paperboard is provided with more than two layers of layered structures, and the coloring paste obtained by the dyeing process is distributed in one layer or a plurality of layered structures of the paperboard. The paperboard can be composed of dyed and bleached sulfate chemical pulp and undyed and bleached sulfate chemical pulp, can be made with paper according to the color and form of the dyed pulp, can be used for counterfeiting prevention, decoration and other personalized use, and is safe and environment-friendly.