31results about How to "Whiteness stability" patented technology

The invention discloses an Italian poplar ASGW pulping process. The main features are: ① sawing and peeling the logs; ② rough grinding with alkali on the millstone grinder; ③ fine grinding with alkali and hydrogen peroxide on the disc mill; ④ screening, purification and bleaching; the main parameters are: wood section 560± 10mm; coarse grinding sodium hydroxide dosage 1.0-2.0% (for absolute dry pulp); fine grinding sodium hydroxide dosage 1.5-2.5% (for absolute dry pulp); H2O2 dosage 0.2-0.6% (for absolute dry pulp). Its quality characteristics are: breaking length ≥ 2.0Km, tear index ≥ 3.0Mn.m2 / g, percussion degree ≥ 65°SR, wet weight ≥ 2.6g, whiteness before bleaching / whiteness after bleaching 50-55% / 70 - 75% (ISO).

The invention discloses paper pulp and a high-bulk energy-saving environment-friendly card prepared from the same. The paper pulp is prepared from the following components in percentage by weight: 1 to 10 percent of bleached sulfate softwood pulp, 30 to 70 percent of bleached sulfate hardwood pulp, 20 to 50 percent of chemithermomechanical pulp, and 10 to 30 percent of alkaline peroxide mechanical pulp. The invention also provides the copperplate card prepared from the paper pulp and other components. The paper made with the paper pulp is high in bulk, the gram weight of the paper is effectively controlled to be in a certain range, the paper pulp is prevented from being put into production excessively, and the defibrination energy consumption of a paper machine is reduced correspondingly, so that the effects of environment friendliness and energy saving are effectively achieved.

The present invention provides a method for preparing high-strength, high-whiteness, high-thermal-shock-resistance petuntse. The preparation method comprises the following production steps of (1) mechanically beating pyrophyllite, washing to remove mud and removing iron by magnetic separator and sieving; (2) mechanically beating kaolin, washing to remove mud and removing iron by magnetic separator and sieving; (3) according to the percentage by weight, weighting 28% of potassium feldspar, 12% of aluminum oxide, 10% of illite, 10% of montmorillonite and 30% of kaolin, mixing with 10% of pyrophyllite, ball milling, removing iron by magnetic separator and sieving to obtain petuntse materials; (4) press filtering the above sieved petuntse materials to obtain petuntse. The petuntse prepared by the invention is suitable for the production of ceramic products for daily use, product qualification rate is high. The strength, whiteness and thermal shock resistance of the product are superior to that of bone china, porcelain and highly siliceous magnesia porcelain, production cost is low, products are particularly applied in dishwashers, microwaves, refrigerators and sterilized cupboard.

The invention relates to preparation of aluminum hydroxide, in particular to a method for producing high-whiteness aluminum hydroxide by a two-stage decomposition method. The method comprises the following steps of: decomposing carbonic acid in refining solution into which CO2 is introduced and which is delivered to a carbon decomposing tank from the first tank, transferring the refining solutionin which the carbonic acid is decomposed to a second tank of the carbon decomposing tank for stirring, and after stirring, performing solid-liquid separation; and performing carbon decomposition or continuous seed decomposition of the solution obtained after the solid-liquid separation to obtain the high-whiteness aluminum hydroxide. By adopting the preparation method, the color fluctuation of the aluminum hydroxide stock solution, namely the refining solution, caused by the fluctuation in the production process of a sintering method is eliminated, and the quality of the high-whiteness aluminum hydroxide is stabilized.

A method to stabilize the paper pulp brightness belongs to the pulp and paper making technical field. By adding the diethylenetriamine pentaacetic acid into a front pulp grinding chest, a white waterchest and a pulp mixing chest of an alkaline peroxide mechanical pulp respectively, metallic ions in the system are concealed to reach the purpose of stabilizing the color and luster of the alkaline peroxide mechanical pulp(APMP pulp), promote the brightening efficiency of a brightening agent which is added subsequently, keep the original color and luster of the pulp, and reduce the amount of thebrightening agent added subsequently. With the method, the brightness of the finished paper reaches over 80 degrees SR, the brightening efficiency of the brightening agent added subsequently is promoted, and the amount of the brightening agent used is reduced. The finished product is provided with the bright color and luster, and the smooth feeling, and can meet the requirement of printing, so thegrade of the finished paper is promoted. Moreover, the working efficiency is promoted, the production cost is reduced, and the energy is saved.

The invention relates to a production technology of a white top liner. The technology comprises the following steps that 1, ONP pulp is prepared, water is added to fibers obtained from first flotation of the ONP pulp, bleaching is conducted, first ONP pulp is obtained, water is added to fibers obtained from second flotation of the ONP pulp, bleaching is conducted, second ONP pulp is obtained, concentration is conducted on ONP pulp of two times of flotation, and third ONP pulp is conducted; 2, DMOW pulp is conducted, water is added to fibers obtained from first flotation of the DMOW pulp, bleaching is conducted, first DMOW pulp is obtained, water is added to fibers obtained from second flotation of the DMOW pulp, bleaching is conducted, second DMOW pulp is obtained, concentration is conducted on DMOW pulp of two times of flotation, and third DMOW pulp is conducted; 3, the first DMOW pulp, the first ONP pulp and original wood pulp are mixed, a surface layer is obtained after the mixture flows to paper-making meshes, the second DMOW pulp and the second ONP pulp are mixed, a bottom layer is obtained after the mixture flows to the paper-making meshes, the third DMOW pulp, the third ONP pulp and OCC pulp are mixed, and a core layer is obtained after the mixture flows to the paper-making meshes.