165results about "Chemical/biochemical paper treatment" patented technology

The invention relates to a machine for chromatogenous grafting treatment of a scrolling substrate (S) having a hydroxylated face (Fh), comprising:

• • an application device (3) of a grafting reagent on the hydroxylated face (Fh) of the substrate,
  • a heating roller (4) for the development of the grafting reaction on the hydroxylated face (Fh) of the substrate, said roller (4) being provided with a bar-end system (5a, 5b) for applying a face of the substrate (S) against said heating roller (4),
  • an extraction device (6) of the hydrochloric acid produced during the grafting reaction,
  • an application device (7) of an air knife on the treated face of the substrate for eliminating the residual grafting reagent.

The invention also relates to a chromatogenous grafting process used in said machine.

A method of modifying a polymeric material which comprises the steps of activation-treatment and a hydrophilic polymer-treatment, or comprises the steps of activation-treatment, a hydrophilic polymer-treatment, and monomer grafting in this order, or comprises the step of a solvent-treatment followed by these steps. Thus, the polymeric material, e.g., polyolefin, is improved in hydrophilicity, adhesion, etc. without lowering the practical strength thereof The polymeric material thus improved in adhesion and other properties can be used in many applications where water absorption and adhesion are required, such as an absorption material, e.g., a wiping/cleansing material, a water retention material, a material for microorganism culture media, a separator for batteries (or cells), a synthetic paper, a filter medium, a textile product for clothing, a medical/sanitary/cosmetic supply, and reinforcing fibers for composite materials.

The invention discloses multifunctional nano compound treating fluid for protecting paper cultural relics. The multifunctional nano compound treating fluid takes deionized water as a solvent, and comprises nano magnesium hydroxide, nano titanium dioxide and hydroxyethyl cellulose, wherein nano magnesium hydroxide accounts for 0.2-1.0% of the weight of deionized water, nano titanium dioxide accounts for 0.1-0.8% of the weight of deionized water, and hydroxyethyl cellulose accounts for 0.2-0.8% of the weight of deionized water. The invention also discloses a preparation method of the multifunctional nano compound treating fluid. The multifunctional nano compound treating fluid can be used for large-area treatment of the paper cultural relics, and can be used for providing protection for deacidification, solidification, light-resistant degradation and mould proofing of the paper cultural relics during a large-area treatment of the paper cultural relics. The pH value of the paper cultural relics treated by the multifunctional nano compound treating fluid can reach an alkalescence degree, and the paper cultural relics have a certain alkali residue, can resist external acid, can be greatly improved in tensile strength, and have a certain antibacterial property.

Disclosed is a battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of the nonwoven fabric is 20 m2/m2 or more, a thickness of the nonwoven fabric is 0.1 mm or less, a uniformity index of the nonwoven fabric is 0.15 or less, and the nonwoven fabric contains fine fibers having a fiber diameter of 4 mum or less.

Methods for reducing energy required for a pulp refining processes by treating a mechanical pulp with a hemicellulase composition are presented. The enzymatic treatment can be carried out at a temperature of from about 10° C. to about 90° C., and/or at a pH of from about 2 to about 10. Paper made from the treated pulp has improved strength over paper made from untreated pulp.

The present invention is directed to a fibre-reinforced film comprising a paper-reinforced alginate film containing polyhydric alcohol. Further, the invention is directed to a process for producing the fibre-reinforced film, and the use thereof for packaging food products, particularly meat products to be cooked and smoked.

A process for production of a lignocellulosic material modified by conjugation thereto of a phenolic substance comprising a substituent which, in the conjugated form of the phenolic substance, is, or may become, negatively or positively charged, respectively, comprises: reacting a lignocellulosic fibre material and the phenolic substance with an oxidizing agent in the presence of an enzyme capable of catalyzing the oxidation of phenolic groups by the oxidizing agent; and reacting together the products of the reactions; with the proviso that the phenolic substance is not a phenolic polysaccharide. A strengthened lignocellulose-based product (e.g. a paper product) may be prepared by a procedure wherein a product produced in accordance with the latter process is treated with a strengthening agent having an ionic charge of sign opposite to that which is conferred on the modified lignocellulosic material by the charge-conferring substituent.

The present invention provides an automatic control system, method and paper manufacturing machine using such control system for automatically controlling the amount of press section dewatering via the metered application of chemical dewatering agents applied to a paper web in a paper manufacturing process. The control system includes a feedback controller for controlling the amount of chemical dewatering agent applied to a paper web, and a monitoring device for obtaining a measurement of the moisture of the paper web exiting the press section.

A process for producing microfibrillated cellulose comprises providing a slurry comprising cellulosic fibers, treating the slurry with an enzyme, mechanically treating the slurry so that the fibers are disintegrated wherein the mechanical treatment and the treatment with the enzyme is performed simultaneously in a single treatment step. In this way it is possible to produce microfibrillated cellulose (MFC) in an improved and energy efficient way. A microfibrillated cellulose is produced according to the process.

The invention discloses a process for manufacturing flat vulcanized fibre. The process comprises the following steps of: performing gelling treatment on base paper by using solution of zinc chloride according to the preset temperature condition; cramming a plurality of gelled raw vulcanized fibre flat plates into grids to perform ageing treatment; performing desalination on the aged raw vulcanized fibre by using the solution of zinc chloride with degressive relative concentration; and cleaning, drying and shaping the desalted raw vulcanized fibre flat plates sequentially. The manufacturing process can overcome the defects of non-uniform shrinkage, easy deformation, easy cracking, low safety and the like in the prior art so as to realize the advantages of uniform shrinkage, no deformation, no cracking and high safety.

The invention provides a production method of special anti-counterfeiting rice paper for a postage stamp, which comprises the following steps: adopting wingceltis barks and straws from sand fields as raw materials, preparing pulp through soaking, beating and bleaching with calcium hypochlorite bleach solution; purifying the prepared pulp, fetching paper, drying, and cutting to manufacture raw rice paper; performing the alum dragging treatment of the raw rice paper in alum solution, and naturally drying the rice paper to obtain non-absorbent rice paper; and applying glue on the back of the non-absorbent rice paper, and drying and flattening to manufacture the special anti-counterfeiting rice paper for the postage stamp. Since the production method in the invention is an improvement based on the conventional production process, the produced rice paper not only preserves the properties of the conventional rice paper, but also has excellent printing applicability. Therefore, the rice paper can be used as the special anti-counterfeiting rice paper for stamps, stamped postcards and other postage stamps.

A paper tissue and products made from paper tissue, such as paper handkerchiefs, facial tissues, bath and cosmetic tissues, paper tissue wipes of any kinds and the like. The invention describes both the process for making a smooth and absorbent lotioned paper tissue, with high transferability of the lotion. The process steps comprises the steps of (a) providing a paper tissue web continuously moving next to a lotion application unit comprising at least one rotating surface, (b) transferring said lotion onto one rotating surface,’(c) expulsing said lotion from the said rotating surface into a stream of lotion droplets, by primarily the centrifugal force of the rotation of said rotating surface, (d) intercepting said paper tissue with said stream of lotion droplets. The invention also describes a paper tissue comprising a lotion distributed as discrete deposits on its surface. The deposits have a high local concentration of lotion and cover a relatively small area of the tissue.

A method of deinking paper includes applying a deinking solution to the paper to be deinked; the deinking solution being comprised of a cleaning solution and a surfactant; abrading the paper to remove the ink from the paper; and washing the paper to remove the deinking solution from the paper.

The present invention concerns a method for enzymatic treatment of lignocellulosic materials which contain xylan-polymers, such as cellulose kraft pulps. According to a method of the present kind, at least a part of the hexenuronic acid groups present in the material is selectively removed in order to remove metal ions from the pulp, to change the surface charge thereof, to improve the brightness stability of the pulp and to render the material more suitable for enzymatic treatment.

The invention relates to the technical field of functional paper, in particular to superhydrophobic paper and a preparation method thereof. The preparation method includes the steps of 1), subjectingthe paper to hydroxylation modification; 2), etching the paper with a plasma etching method; 3), subjecting the paper to plasma pretreatment with Ar as an air source; 4), deposing a superhydrophobic membrane on the surface of the paper with a plasma chemical vapor deposition method. A micro-structure can be prepared on the surface of the paper by adopting the plasma etching method to have the paper etched, specific surface area of the paper is increased, roughness of the paper is increased, the surface of the paper is enabled to be difficult to infiltrate, contact angle is favorably increased,the fluorine-containing superhydrophobic membrane is deposed on the surface of the paper with a plasma chemical vapor deposition method through fluorine modification, the superhydrophobic membrane has the advantages of high strength and scratch resistance, and hydrophobicity has a long lasting effect.

The invention makes available a method to introduce specific chemical groups onto the surface of any polymeric carbohydrate material to alter the physico-chemical properties of said material. In particular, the method comprises the controlled introduction of chemically-modified oligosaccharides into a carbohydrate polymer using a transglycosylating enzyme.

The invention relates to a gas diffusion layer for a proton exchange membrane fuel cell and a preparation method thereof, and the method comprises the following steps: carrying out papermaking and drying on a carbon fiber suspension mainly composed of a fibrous adhesive, water, a dispersant and carbon fibers with different length-diameter ratios to obtain carbon fiber raw paper, carrying out carbonization and graphitization treatment under the protection of nitrogen or inert gas to obtain the gas diffusion layer for the proton exchange membrane fuel cell; the fibrous adhesive being a composite fiber or a blend fiber composed of phenolic resin and other resin; the finally prepared gas diffusion layer for the proton exchange membrane fuel cell having pore gradient, and the layer with the minimum pore diameter being an intrinsic microporous layer. According to the method, the step of impregnating the base paper with the resin is omitted, integrated forming of the carbon paper and the microporous layer can be achieved, subsequent coating preparation of the microporous layer is omitted, the process is simple, and the cost is reduced.