51 results about "Fine paper" patented technology

A foamed product that generates no smoke when incinerated, has a low calorific value, and achieves a desired dimension and thermal insulation performance is provided. A foamed product 1 is formed by heat-mixing, in an extruder 11, a paper pellet 7 that is a mixture of a fine paper powder having a particle diameter of 30 to 200 μm and starch, a container recycle pellet 8 that is a mixture of polypropylene, polyethylene, and polystyrene, foamable polypropylene 9, and water 10. A weight distribution is set so that the paper pellet 7 is 50 to 65% by weight, the container recycle pellet 8 is 15 to 25% by weight, the foamable polypropylene 9 is 10 to 30% by weight, and the water 10 is 10 to 20% by weight to these resins and other materials.

A continuous filler treatment process has been developed to enhance the fixation of anionic latex on filler in a short time. In this process anionic polymer dispersions (latex) are added to common papermaking filler slurries at ambient temperature and then mixed with water of temperature higher than the glass transition temperature (Tg) of the latex used. To efficiently fix the latex the temperature of the filler / latex mixture must be 30-60° C. higher than the Tg of the latex used. The chemical composition of the resin and the type of surfactant used during the emulsion polymerisation process of the polymer latex dispersions are important factors for efficiently fixing the latex onto the filler by adding hot water and improving the properties of paper made with the treated filler. The enhanced fixation of anionic latex onto filler using hot water is done in mixing vessels that can control shear and mixing time. The anionic latexes applied by this process are totally and irreversibly fixed or bound onto the filler particles and the aggregated filler slurry is stable over time. The latex-treated filler slurry can be added to papermaking furnishes at any point prior to the headbox of the paper machine or stored for later use. It can be added to wood-free or wood-containing furnishes commonly used for making fine papers, mechanical pulp papers, and multi-ply paperboards. The latex-treated filler slurry improves filler retention, only slightly reduces sheet strength and improves sizing performance. Furthermore, latex-treated calcium carbonate filler, such as precipitated calcium carbonate (PCC), is more acid-resistant and, when used in manufacturing mechanical pulp paper under neutral conditions, less acid is needed to control the pH.

The invention relates to a method in the treatment of suface-sized paper, in particular fine paper, in a finishing section of a paper machine. In the method a paper web (W) is first dried in a forward dryer section (D) of the paper machine in several successive downward open drying groups (G1...g6) that apply single-wire draw, after which the paper web (W) is finished in the finishing section. In the finishing section the web (W) is surface-sized in a surface-sizing unit (20) and dried. According to the invention, in the method, the surface-sized paper web (W) is mainly dried by means of contact-free drying. The web (W) is dried at least partly by means of airbone web-dryers (31, 32, 34, 36) or by means of impingement drying. In the method, the power of the airbone web-drying / impingement drying is regulated on both sides of the web (W) such that the tendency of curling created in the web (W) in the forward dryer section (D) can be controlled. In addition, the invention relates to a finishing section of a paper machine in the treatment of surface-sized paper, in particular fine paper, in the paper finishing section. Before the finishing section, the paper machine comprises a forward dryer section (D) in which there are several successive downward open drying groups (G1...G6) that apply single-wire draw. The finishing section comprises surface-sizing devices (20) and drying means. According to the invention, the drying means of the finishing section are mainly based on contact-free drying. At least one of the means are airborne web-dryers / impingement dryers (31, 32, 35, 36), whose power can be regulated such that the tendency of curling of the web can be controlled by the effect of drying applied on the different sides of the web (W).

A heat insulator that generates no smoke when incinerated, has a low calorific value, and achieves a desired dimension and heat insulation performance is provided. A heat insulator 1 is formed by heat-mixing, in an extruder 11, a paper pellet 7 that is a mixture of a fine paper powder having a particle diameter of 30 to 200 μm and starch, a container recycle pellet 8 that is a mixture of polypropylene, polyethylene, and polystyrene, foamable polypropylene 9, and water 10 to obtain a plate-like foamed product 2, and orthogonally overlaying a plurality of plate-like foamed products 2. A weight distribution is set so that the paper pellet 7 is 50 to 65% by weight, the container recycle pellet 8 is 13 to 25% by weight, the foamable polypropylene 9 is 10 to 30% by weight, and the water 10 is 10 to 20% by weight to these resins and other materials.

The invention relates to a styrene-acrylic emulsion, a preparation method thereof, and an application thereof. The styrene-acrylic emulsion provided by the invention comprises the components of: starch, amylases, a cationic monomer, an acrylate monomer, a crosslinking monomer, styrene, a dispersing agent, hydroxyethyl methacrylate, an initiator aqueous solution with a concentration of 20wt%, and deionized water. A surface sizing emulsion prepared by using the styrene-acrylic emulsion provided by the invention and biological latex has better film-forming performance and good hydrophobicity. With the surface sizing emulsion, paper can be provided with better surface strength, better printing performance, and certain water resistance. The styrene-acrylic emulsion is environment-friendly. When in use, the surface sizing emulsion prepared by using the styrene-acrylic emulsion provided by the invention is directly coated on the surface of paper, and surface sizing starch is no longer used during the surface sizing process. Therefore, a fine paper surface sizing operation process is simplified, and surface sizing process stability in fine paper production is improved.