363 results about "Paper quality" patented technology

The invention discloses an automatic scanning examination paper marking system and a corresponding method, belonging to the image processing and mode identifying technique field. The system comprises a paper defining module, an answer sheet manufacturing tool based on VBA, a file scanner, a database server, an answer sheet information automatic identifying module, an answer sheet identified-result revising module and an automatic marking summarizing module. The whole structure of the automatic paper marking system appears as a star and the database server is the center of the system and other modules and apparatuses are respectively connected with the database server by network means and used for information transmission and network sharing. One automatic scanning examination paper marking method includes the following steps: paper defining, paper manufacturing based on VBA, examination, subjective question marking, answer sheet scanning, answer sheet information identifying, identified-result revising and automatic marking and summarizing. The advantage is that the invention can mark the paper including both subjective questions and objective questions; the requirements to the operation technique and apparatus are low; the requirements to the paper-quality of the answer sheet, pens and printing are low and the checking is convenient.

The invention discloses an authoritative author and high-quality paper recommending system and recommending method. According to each preset theme, the recommending system calculates an author authoritative value and a paper quality paper through a plurality of factors including an author level, a citation rate, publish date and a publish periodical or a meeting level of a paper, and hereby recommends an authoritative author and a high-quality paper with the specified theme, so as to avoid authors with low authoritative values or papers with low quality values in an author or paper recommending list, and to reduce system calculation burden and improve system response time. The system and the method, on the basis of properties of academic papers, introduce relates algorithms after taking various factors affecting the author authoritative value and the paper high-quality value into comprehensive consideration, so as to improve accuracy of recommended results, which not only recommends high-quality papers to users but also remarkably shortens calculation time, and the system and the method are good in a real-time updating effect; furthermore, the system can enhance diversity of recommended results in the paper recommending list, and overcome a shortcoming of an existing system which is narrow in user view.

The enzymatic straw material pulping process includes three stages of mechanical pre-treatment, enzyme treatment and chemical pulping or chemical-mechanical pulping. After being pretreated mechanically in a pulp grinder, the straw material is treated with hemicellulase liquid or mixed enzyme liquid comprising hemicellulase and lignin peroxidase at pH 3.5-6.5 and 40-60 deg.c for 1-10 hr. In chemical pulping, the material is presoaked with waste pulp-making liquor before extruding out wastes liquor and digested; and in chemical-mechanical pulping, the material is first treated with EDTA, NaOH and H2O2 at 40-80 deg.c for 30-120 min and then ground to form the pulp. The present invention is used in papermaking enterprises with straw as material and has the advantages of low pollution load, high, paper pulp quality, easy-to-process waste liquor, etc.

The invention relates to a cleaning process for extracting high quality fiber with high efficiency, high yield and low energy consumption from plant raw materials by a combination method of chemistry and machinery in a sectional type. The process comprises the following steps: a raw material is fully immersed in a NaOH solution or a KOH solution or limewater with low concentration (black liquor is used for supplementing into the corresponding alkaline for repeated and circular use) under the normal temperature or certain temperature, wherein the concrete immersion temperature and immersion time can be determined according to the types and the water content of the raw materials so that the alkaline liquor is fully, uniformly and properly absorbed and diffused into plants; steaming under normal pressure or steaming with pressure or no liquid steaming with pressure is used; the steamed material can be selected according to the paper quality requirement by using a blowout slurrying mode or a mode of pulp refining after blowing to form slurry or by using thread rolling and pulp refining to relief material once or multitime to prepare slurry. The novel process combines the advantages of chemical treatment and mechanical pulping, so that the uniform mass transfer and uniform heat transfer can be ensured and the damage to cellulose and hemicellulose by excessive alkali can be reduced, the yield of fiber is raised to about 75% from about 45% of the prior art, so that the novel pulping process is capable of avoiding the usage of auxiliary agents like sulfured and anthraquinone, conveniently extracting and using the cellulose and lignin in black liquor, and overcoming the influence on environment during the process of pulping and post-treating lignin.

Formulations for pitch control, and methods of making and using thereof, are described herein. The formulations contains one or more 1,3-selective lipases. 1,3-selective lipases catalyze the hydrolysis of the terminal ester groups in triglycerides leaving the internal ester group intact. The enzyme formulations can contain one or more additives, such as dispersants, metal ions, absorbents, adsorbents, cationic polymers, and combinations thereof. The enzyme formulation is typically applied as a solution to the pulp stock. The enzyme formulations can be applied at any of one or more various points during the pulping and paper manufacturing processes. The use of selective lipase(s) decreases the total concentration of fatty acids in the system, and catalyzes the formation of monoglycerides, which are more effective at dispersing fatty acids than glycerol, the product of non-selective lipases, thereby improving pulp and paper machine runnability and pulp and paper quality.

The invention provides a coating used in the papermaking field. The coating contains nanometer microcrystalline cellulose, a pigment, a latex, an assistant and water, and the nanometer microcrystalline cellulose is highly-crystallized cellulose having a length of 100-500nm and a width of 3-100nm obtained by hydrolyzing a cellulose raw material in a strong acid; and the bone dry mass parts of the nanometer microcrystalline cellulose, the pigment, the latex, the assistant and water in the coating are 0.02-10, 75-95, 5-15 and 0.35-10 respectively. The invention also provides a coated paper made by using the coating. The coating is coated on the surface of paper to effectively improve the glossiness, the post-print glossiness and the roughness of the coated paper in order to improve the paper quality.

In an image forming apparatus, when a general user pulls a paper tray out of the image forming apparatus, changes used paper with another paper having different paper quality to insert the paper tray into the image forming apparatus and operates a touch panel to change the paper quality setting, a CPU stores paper quality data before change in a RAM. The CPU returns the paper quality setting to the paper quality setting before change when a printing job is completed on the paper after paper quality change.

The invention discloses low-specific-gravity stone paper relating to synthetic paper. The low-specific-gravity stone paper comprises a base paper layer and a coating layer, wherein the coating layer is coated on the base paper layer; the base paper layer comprises 15-30 parts by weight of synthetic resin and 70-85 parts by weight of mixing material, wherein the synthetic resin is polylactic acid, EVA (ethylene vinyl acetate copolymer), PP (polypropylene), PE (poly ehtylene) or a mixture of any two of the polylactic acid, the EVA, the PP and the PE; the mixing material is a hollow glass ball, coal ash or the mixture of the hollow glass ball and the coal ash; and the coating layer comprises 20-40 parts by weight of acrylic resin, 20-40 parts by weight of lithopone and 30-50 parts by weight of deionized water. The low-specific-gravity stone paper has the following benefits: the mixing material is the hollow glass ball or coal ash so that the mixing material has low specific gravity and good dispersity; the lithopone has good covering power, thus the weight of the paper is convenient to reduce, the paper quality is improved, and the manufacturing cost is reduced.

A thermal transfer printer includes: a pealing roller which is disposed downstream of a printing position set between a thermal head and a platen roller and defines a peeling start position of an ink ribbon; and a tension plate which is disposed on a further downstream side than the peeling roller and slidably stretches the ink ribbon under a tension relative to the printing position, via the peeling roller. With a back tension being ensured by means of the tension plate to prevent slackness of the ink ribbon, the peeling roller performs peeling, thereby avoiding retention of dust or the like and the lowered quality of paper due to such retention. In this manner, problems such as wrinkles occurring with the ink ribbon are eliminated without damaging paper, and further, improvement of printing quality is compatible with that of paper quality, through a design based upon a mechanism concerning the occurrence of wrinkles.

The technique of the present invention enhances the stability of paper material identification of sheets. To achieve the above purpose, both short-wavelength light in the range of 370 nm and long-wavelength light in the range of 420 to 1000 nm are irradiated to paper to be identified in identifying the paper material. The identification is carried out, based on the difference in absorbance of the paper, which is obtained for each irradiated light. The absorbance of the paper varies according to the paper material, thereby enabling the identification of the paper material free from influence, which are caused by differences in manufacturing process, such as shading patterns. In addition, the simultaneous use of the short-wavelength light and the long-wavelength light declines influence on the absorbance, which are caused by environmental factors, such as humidity and deterioration of sheets, thereby resulting in stable identification of the paper material.

The invention relates to a method for manufacturing environment-friendly paper, comprising the following steps that: two raw materials, which are 60 to 80 percent in weight of mineral composition powder and 19 to 37 percent of seaweed glue, are mixed first and with 1 to 3 percent of auxiliary material to form a mixture which is subjected to extruding, compounding and pelleting and thus a raw material of finished product is produced; the raw material of finished product is heated and softened inside a paper film making machine and is bleached by the auxiliary material as well as is extended to form a paper film by atmospheric pressure; the white paper is made by bi-directional extension molding and cooling as well as drying. The method takes the mineral composition powder and the seaweed glue as the main raw materials, thereby not only saving wood resources and other raw materials for making paper, lowering the cost for making paper and avoiding the pollution of chemical substances such as acid and alkali on the environment. In addition, the paper made by the method has the characteristics of good intensity, good flexibility, and high whiteness, thereby not only improving the paper quality but also lowering the production cost of the paper and having important benefits.

The invention relates to a quality evaluation method of color ink-jet paper based on multi-level grey relational evaluation. The quality evaluation method comprises the following steps of: selecting a plurality of types of the color ink-jet paper which needs to be evaluated, and measuring basic physical performances of the paper; selecting a professional photo printer to sequentially print professional test versions, color scales and images on paper samples; measuring attribute printing performance of the printed images by an instrument; based on modeling which applies the multi-level grey relation technology to a comprehensive evaluation system, analyzing a plurality of evaluation data of the paper samples, calculating the relation degree of each type of the paper samples, finally establishing a printing quality evaluation system of the color ink-jet paper according to a multi-level grey evaluation model and then testing sensitivity of the system; and distinguishing the relationship among various influence factors according to a relation degree matrix. The quality evaluation method has the following beneficial effects that: a qualitative and quantitative evaluation result is obtained by applying the model based on the multi-level grey system to quality evaluation of the color ink-jet paper, thus solving the difficult problem that the overall quality of the color ink-jet paper is difficult to be scientifically and accurately evaluated in the printing field, obtaining the scientific and quantized comprehensive evaluation result of the paper quality, reaching a more scientific and accurate effect without judgment depending on subjective consciousness of a person, and playing a certain reference role in establishment of quality standard of ink-jet printing of the color ink-jet paper.

The invention relates to a paper technology, especially for electrolytic capacitor paper manufacturing method. The method includes the following steps: absorbing layer pulping; using paper pulp to manufacture paper; pressure layer pulping; using paper pulp to manufacture paper; compositing absorbing and pressure layers; the pulping degree of the absorbing layer is 12degreeSR-50degreeSR. And it adopts side wave fourdrinier paper machine to copy paper. But the pressure layer respectively is 30degreeSR-98degreeSR and cylinder paper machine. Thus the invention resolves the problem that cross direction water uptake of electrolytic capacitor paper is not very good. And the invention has the advantages of high purity, uniform paper quality, thickness, tightness, and fiber array.

The invention provides a sizing agent for paper, which is mainly prepared by mixing glue, polyvinyl alcohol, cationic styrene acrylate, aluminum sulfate and fatty acid ester, wherein the glue is prepared by the following steps: adding a biological enzyme into a 20-25 wt% starch water solution, carrying out enzyme digestion at 80-85 DEG C for 10-20 minutes, heating to 130-140 DEG C, and boiling for 0.5-1 minute to inactivate the enzyme; and the polyvinyl alcohol accounts for 1-2 wt% of the glue, the cationic styrene acrylate accounts for 2-4 wt% of the glue, the aluminum sulfate accounts for 2-4 wt% of the glue, and the fatty acid ester accounts for 0.1-0.3 wt% of the glue. The sizing agent is simple in composition and easy to prepare; and after being applied to paper, the sizing agent can obviously improve the paper quality, enhance the breaking resistance, tear resistance and moisture absorption resistance of the paper, so that the paper has favorable smoothness and strong adaptability to surface printing.

The invention discloses a wall paper production processing device. The device comprises a support frame, two sides of the bottom of the inner cavity of the support frame are fixedly connected to roller blocks, the top of the roller block is provided with a roller groove, the inner cavity of the roller groove is movably connected to the roller through a rotation shaft, the top of the roller is fixedly connected to a stirring kettle, the centre axis in the left side of the stirring kettle is fixedly connected to a U-shaped block, and the inner cavity of the U-shaped block is movably connected to a connecting rod through a vertical rod. A second motor rotates and drives a second belt plate and a first belt plate to rotate so that a fixed rod and a stirring rod are driven to rotate and stirring blades further stir the materials. A cutting blade cuts fibers of the materials so that stirring and mixing are full. The device solves the problem that the traditional wall paper production device cannot fully stir fibers in paper pulp, further reduces stirring efficiency and seriously influences wall paper quality.

The invention provides a tipping paper quality test warning system and a corresponding test method, and belongs to the technical field of material measurement and analysis by optical means. The quality test warning system includes a reel splitting machine, a data center and a rewinding test device. The reel v machine is provided with an on-line test device (1); during splitting of the reel paper, information of paper with defects is recorded and stored in the data center; the data center is used as a connecting device for integration of the reel splitting machine and the rewinding test device; at the same time, for the defective products of small volume need rewinding test, a controller of the rewinding test device retrieves the corresponding information stored in the data center, and controls the rewinding test device to stop at a proper position, and conducts operations of removal and connection. The system and method achieve one-time test of a variety of processing defects, save investment in equipment, meet the quality requirements of tipping paper, quickly and accurately find and eliminate defects, and improve the test reliability, accuracy and efficiency of test.