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3073 results about "Papermaking" patented technology

The art, science, and technology of papermaking addresses the methods, equipment, and materials used to make paper and cardboard, these being used widely for printing, writing, and packaging, among many other purposes and useful products. Today almost all paper is manufactured using industrial machinery, while handmade paper survives as a specialized craft and a medium for artistic expression.

Absorbent sheet having regenerated cellulose microfiber network

An absorbent paper sheet for tissue or towel includes from about 99 percent to about 70 percent by weight of cellulosic papermaking fiber and from about 1 percent to about 30 percent by weight fibrillated regenerated cellulose microfiber which was regenerated form a cellulosic dope utilizing a tertiary amine N-oxide solvent or an ionic liquid. Fibrillation of the microfiber is controlled such that it has a reduced coarseness and a reduced freeness as compared with unfibrillated regenerated cellulose microfiber from which it is made and provides at least one of the following attributes to the absorbent sheet: (a) the absorbent sheet exhibits an elevated SAT value and an elevated wet tensile value as compared with a like sheet prepared without fibrillated regenerated cellulose microfiber; (b) the absorbent sheet exhibits an elevated wet/dry CD tensile ratio as compared with a like sheet prepared without fibrillated regenerated cellulose microfiber; (c) the absorbent sheet exhibits a lower GM Break Modulus than a like sheet having like tensile values prepared without fibrillated regenerated cellulose microfiber; or (d) the absorbent sheet exhibits an elevated bulk as compared with a like sheet having like tensile values prepared without fibrillated regenerated cellulose microfiber. In some embodiments, the pulp is pre-treated with debonder to enhance the wet/dry CD tensile ratio of the sheet.
Owner:GPCP IP HLDG LLC

Low compaction, pneumatic dewatering process for producing absorbent sheet

A low-compaction method of making an absorbent cellulosic web includes: forming a nascent web from a papermaking furnish; dewatering the nascent web to a consistency of from about 10 to about 30 percent on a foraminous forming support traveling at a first speed; rush-transferring the web at a consistency of from 10 to about 30 percent to an open texture fabric traveling at a second speed slower than the first speed of the forming support; further dewatering the web on the impression fabric to a consistency of from about 30 to about 60 percent by way of (i) combining the open texture fabric bearing said web with a fluid distribution membrane and an anti-rewet felt as the three pass through a nip into a pressure chamber defined in part by a plurality of nip rolls, the fluid distribution membrane bearing against the side of the open texture fabric away from the web, with the anti-rewet felt bearing against the web, and (ii) applying a pneumatic pressure gradient from the distributor membrane through the web thereby dewatering the web; and drying the web. Preferably the process includes the steps of selecting the papermaking furnish and controlling the process such that the dried web has a void volume fraction of at least 0.7, a hydraulic diameter in the range of from about 3 to about 20 microns and a Wet Springback Ratio of at least about 0.65. Optionally provided is a high solids fabric crepe in a pressure nip.
Owner:GPCP IP HLDG LLC

Method for preparing calcium sulfate crystal whiskers by using impurity-containing gypsum as raw material

The invention relates to a method for preparing calcium sulfate crystal whiskers (CaSO4) by using impurity-containing gypsum as a raw material. The method comprises the following steps of: removing main impurities in the raw material which is the low-priced impurity-containing gypsum resource in a mode of roasting, acid-complex leaching and alkaline leaching and simultaneously thinning crystal grains to obtain a superfine dihydrate calcium sulfate precursor which is high in purity and dispersibility; and preparing the anhydrous calcium sulfate crystal whiskers with a length of 20 to 2,000mu m, a diameter of 0.5 to 20 mu m, a length-diameter ratio of 40 to 1,000 and a weight percent content of over 95 percent in a mode of hydrothermal conversion-roasting of a fluxing agent. The method has the advantages of low-priced and easily bought raw materials, simple process, wide application range, and high added value. The calcium sulfate crystal whiskers prepared by the method have a big length-diameter ratio and regular shape, and can be used as reinforcing, heat insulating or flame retardant materials in industries of plastics, rubbers, coatings, papermaking, building materials and the like.
Owner:KUNMING UNIV OF SCI & TECH

Two-stage ultrasonic vibration atomizer

The invention discloses a two-stage ultrasonic vibration atomizer, which comprises a liquid conveying pipeline, a bolt, a rear cover plate, a piezoelectric ceramic plate, an electrode sheet, an amplitude transformer, a first-stage atomizing spray head and a second-stage atomizing radiation surface, wherein the rear cover plate, the piezoelectric ceramic plate and the electrode sheet are pressed by the connection between the amplitude transformer and the thread at the front end of the bolt, so as to form a second-stage ultrasonic atomizing vibrator; the first-stage atomizing spray head is connected with the front end of the amplitude transformer; and the second-stage atomizing radiation surface is clamped between the front end of the amplitude transformer and the rear end of the first-stage atomizing spray head. According to the invention, the vibrator part adopts a sandwich transducer structure, and has high power capability; the first-stage atomizing is realized by the micro-spraying holes on the first-stage atomizing spray head; the second-stage atomizing is realized by ultrasonic vibration; and through two-stage atomizing, the two-stage ultrasonic vibration atomizer has the advantages of small gas atomizing grains and the like, and can be applied to the fields of cooling of mechanical processing and cutting heat, air moistening, medical treatment, dedusting, deodorizing, weaving, printing and dyeing, tobacco, flowers, papermaking, electronics, spray-coating, chemical industry, granulating, fungus culturing, fruit storage and the like.
Owner:SUZHOU UNIV OF SCI & TECH

Method for preparing multifunctional titanium dioxide pigment with chlorination method

The invention relates to a method for preparing multifunctional titanium dioxide pigment with a chlorination method, which comprises the following steps of: blending a titanium dioxide primary product into titanium dioxide slurry by adopting a chlorination method and adjusting a pH value between 9.0 and 11.0; adding a phosphate dispersing agent and carrying out grinding treatment; removing a grinding medium from the slurry and heating; adding a water-soluble silicate solution for curing; adjusting the pH value of the slurry for forming amorphous silica and curing for forming a first coating layer; cooling the slurry to 50-70 DEG C; adding a sodium metaaluminate solution and curing; adjusting the pH value of the slurry between 8.0 and 9.0, curing and forming an amorphous alumina coating layer on the first coating layer; adding an aluminum salt solution, maintaining the pH of the slurry between 7.0 and 9.0 and curing; adjusting the pH value of the slurry between 6.0 and 7.0 and curing; and washing the slurry with deionized water till the conductivity of a filter cake is larger than 15,000 ohm.cm, and carrying out drying and steaming pulverizing treatment to obtain a finished product. The multifunctional titanium dioxide pigment prepared with the method has higher weather resistance, whiteness, covering capability, opacity and dispersibility and excellent processing performance in the fields of coating, plastics, papermaking, and the like.
Owner:中信钛业股份有限公司

Process for preparing cultural paper by utilizing full-recovered pulp

The invention belongs to the technical field of a papermaking process and particularly relates to a process for preparing cultural paper by utilizing full-recovered pulp. The process for preparing the cultural paper by utilizing the full-recovered pulp comprises the following preparation steps of: a step A of sorting and loading waste paper raw materials; a step B of beating; a step C of screening and purifying; a step D of carrying out primary floatation deinking; a step E of carrying out primary concentration and heat dispersion; a step F of carrying out secondary floatation deinking; a step G of carrying out secondary concentration and heat dispersion; a step H of carrying out oxidation bleaching; a step I of carrying out reduction bleaching; a step J of storing in a tower; a step K of milling pulp; a step L of preparing the pulp; a step M of forming and manufacturing the paper with the pulp; a step N of squeezing and dehydrating; a step O of drying; a step P of squeezing and sizing; and a step Q of carrying out press polishing and then completing processing of a finished product by the working sections of reeling, rewinding, packaging and warehousing. According to the process disclosed by the invention, the high-quality cultural paper of which the appearance quality and the physical indexes all reach the domestic and overseas standards is produced by utilizing the low-price waste paper raw materials; the production cost is reduced; the production environment is clean and environmental-friendly; and the production efficiency is high.
Owner:DONGGUAN NINE DRAGONS PAPER IND

Modified calcium sulfate crystal whisker papermaking filler, preparation method and applications thereof

The present invention discloses a modified calcium sulfate crystal whisker papermaking filler, a preparation method and applications thereof, wherein a modified calcium sulfate crystal whisker papermaking filler is prepared, and then the modified calcium sulfate crystal whisker papermaking filler is applied in papermaking industry. The application of the modified calcium sulfate crystal whisker papermaking filler in the papermaking industry comprises: 1) selection a papermaking slurry, (2) use of the modified calcium sulfate crystal whisker papermaking filler and related auxiliary materials, 3) papermaking, and 4) white water circulation. According to the present invention, the calcium sulfate crystal whisker raw material source is wide, conditions are wide, and solid waste pollution can be effectively solved; the modified calcium sulfate crystal whisker product has characteristics of high whiteness, low abrasion, effectively-controlled solubility, high papermaking retain rate, and low white water load, the problem of pipe scale is eliminated, and the product can completely replace calcium carbonate, kaolin, talc powder, and other papermaking fillers, and partial plant fiber raw materials; and the method has characteristics of low equipment investment, simple modification process, strong operability and low cost, and is applicable for large scale production.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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