YOSHINO GYPSUM CO., LTD Patent applications |
Patent application number | Title | Published |
20160123895 | SIZING DEFECT DETECTION SYSTEM AND SIZING DEFECT DETECTION METHOD - A light emission part projects a laser light toward an edge portion of a formation. The laser light extends in a direction intersecting a conveyance direction of a forming belt. A light receiving part is opposed to the light emission part and located on the opposite side of the formation. The laser light passes through an area above an upper surface of the formation at least partially and is partially blocked by rising of the edge portion of the formation. A control device determines occurrence of the glue-joint failure on the basis of whether the quantity of light received by the light receiving part is reduced by at least a predetermined value or a predetermined rate, and provides or gives a visual display or a warning of the occurrence of glue-joint failure. | 05-05-2016 |
20160107935 | LIQUID DISPERSANT COMPOSITION FOR GYPSUM - The present invention relates to a liquid dispersant composition for gypsum, containing (A) a particular polycarboxylic acid copolymer, a particular nitrogen-containing compound, such as a particular alkylamine, and water, and having pH of 7.0 or more and 13.0 or less at 20° C. | 04-21-2016 |
20150315074 | MIXING AND STIRRING DEVICE, MIXING AND STIRRING METHOD, AND METHOD FOR MANUFACTURING LIGHTWEIGHT GYPSUM BOARD - Turning motion of gypsum slurry spouting onto a sheet of paper for a gypsum board liner is restricted for preventing maldistribution, deviation or irregular dispersion from occurring in the density distribution of the slurry on the sheet of paper. A mixing and stirring device for gypsum slurry has a circular casing forming a mixing area, a rotary disc positioned in the casing, and a tubular passage for feeding the slurry onto the sheet of paper for gypsum board liner. A chute has a fluid passage portion with its cross section being non-axisymmetric with respect to a center axis of the tubular passage, or a fluid passage portion varying a position of the center axis of the tubular passage by means of change or lateralization of the cross section of fluid passage. | 11-05-2015 |
20150225293 | GYPSUM COMPOSITION, GYPSUM SLURRY, GYPSUM HARDENED BODY, GYPSUM-BASED BUILDING MATERIAL, GYPSUM BOARD, AND MANUFACTURING METHOD FOR A GYPSUM-BASED BUILDING MATERIAL - A gypsum composition includes a calcined gypsum and a starch urea phosphate. | 08-13-2015 |
20150218052 | PROCESS FOR MANUFACTURING HIGH-EXPANSION GYPSUM PLASTER COMPOSITION AND HIGH-EXPANSION GYPSUM PLASTER COMPOSITION OBTAINED BY SAID PROCESS - An object of the present invention is to provide a high-expansion gypsum composition in which the expansion coefficient of a general purpose dental gypsum material or the like is simply and effectively improved to such an extent that has never been achieved with conventional technologies without using any special material by adding an inexpensive additive even in a small addition amount, and furthermore another object of the present invention is to provide a high-expansion gypsum composition the setting expansion coefficient of which is appropriately controlled so that the contraction of a resin to be used can be precisely dealt with, the high-expansion gypsum composition being useful for manufacturing a reproduction model to be used in manufacturing a “non-clasp denture” having no problem in, for example, occlusion (adaptability). The objects of the present invention are achieved by means of a method for producing a high-expansion gypsum composition, the method producing a gypsum composition having an enhanced setting expansion coefficient by copulverizing in a dry system a powdered gypsum composition containing calcined gypsum as a main component and dihydrate gypsum. | 08-06-2015 |
20150136350 | CASTING INVESTMENT COMPOSITION AND CASTING PROCESS USING SAME - The object of the present invention is to provide an embedding material composition for casting that makes it possible to conduct a favorable casting in the case where casting is conducted using a resin pattern that is different from a conventional wax pattern in disappearance temperature and disappearance behaviors through “rapid heating” excellent in treatment efficiency. The present invention relates to an embedding material composition for casting not using a heat-expandable refractory material as a main component, comprising: a binder; and a non-heat-expandable refractory material having an average particle diameter of 5 to 20 μm as main components, in which a content of the binder is 25 to 40 parts by mass and a content of the non-heat-expandable refractory material is 60 to 75 parts by mass in the case where the total amount of the main components is 100 parts by mass, and the present invention also relates to a casting process using the embedding material composition for casting. | 05-21-2015 |
20140335365 | GYPSUM BOARD HAVING MOLD RESISTANCE - A gypsum board having mold resistance includes a gypsum core and gypsum board paper covering two surfaces of the gypsum core. The gypsum core contains first and second anti-mold agents, each having a water solubility of 200 ppm or less, and a waterproofing agent. A mixture consisting of the first and second anti-mold agents and starch is applied on a surface of the gypsum board paper, which surface is out of contact with the gypsum core. The first anti-mold agent is 2-(4-thiazolyl)-benzimidazole (TBZ) or 2-benzimidazol carbamic acid methyl ester (BCM), and the second anti-mold agent is 3-iodo-2-propyl butyl carbamate (IPBC). The total amount of the first and second anti-mold agents contained in the gypsum core is 0.03% to 0.2% of gypsum forming the gypsum core on an active ingredient basis, and the additive amount of the waterproofing agent is 0.3% to 1.5% of the gypsum forming the gypsum core. | 11-13-2014 |
20130199418 | DRIED GYPSUM COMPOSITION AND GYPSUM-BASED COATING - Disclosed is a dry gypsum composition containing hemihydrate gypsum, at least one pigment and a crystal habit modifier. The crystal habit modifier is at least one compound selected from the group consisting of sulfate salts, carboxylate salts, carbonate salts and inorganic chlorides, and a content of the at least one compound is in a range of 0.1 to 5 parts by mass per 100 parts by mass of the hemihydrate gypsum, whereby upon hydration of the hemihydrate gypsum into dihydrate gypsum, the dihydrate gypsum is controlled to become plate crystals having an aspect ratio of 1 to 9. A gypsum-based coating formulation making use of the dry gypsum composition is also disclosed. | 08-08-2013 |
20120285348 | JOINT FILLER COMPOSITION - A joint filler composition may include 100 parts by mass of a base material, 1 to 20 parts by mass of inorganic hollow particles, and 3 to 20 parts by mass of a mineral having a chain structure or a layer structure. | 11-15-2012 |
20120255576 | DEVICE AND METHOD FOR CLEANING CONVEYING SURFACE - Labor saving and automatization of cleaning work of a conveyance face for articles or materials are intended to reliably and quickly execute the cleaning work. A cleaning apparatus has a cleaning implement ( | 10-11-2012 |
20120153058 | METHOD OF RECOVERING A BASE PAPER FOR GYPSUM BOARD AND APPARATUS OF RECOVERING A BASE PAPER FOR GYPSUM BOARD - There are provided a method of recovering a base paper for gypsum board for continuously and efficiently recovering a base paper for gypsum board from a waste material of gypsum board including a gypsum core and the base paper for gypsum board adhering thereto. The method of recovering a base paper for gypsum board includes steps of breaking the waste material of gypsum board, separating a gypsum component and a paper piece of the base paper for gypsum board from the broken waste material of gypsum board, and washing the separated paper piece with water using a rotary drum-type washing device so as to eliminate a gypsum component adhering to the paper piece. | 06-21-2012 |
20110135930 | PROCESS FOR CONTINUOUS MODIFICATION OF DIHYDRATE GYPSUM AND MODIFIED DIHYDRATE GYPSUM OBTAINED BY THE PROCESS - Disclosed is a process for the continuous modification of dihydrate gypsum. The process includes a hemihydration step of calcining the dihydrate gypsum as a raw material into hemihydrate gypsum and a recrystallization step of hydrating and recrystallizing the hemihydrate gypsum in an aqueous slurry to convert the hemihydrate gypsum into modified dihydrate gypsum of a crystalline form different from the dihydrate gypsum as the raw material. In the recrystallization step, the aqueous slurry in a recrystallization reaction tank is maintained at a constant temperature under stirring such that the aqueous slurry becomes uniform, and a feed rate of the hemihydrate gypsum to the recrystallization reaction tank and a discharge rate of the recrystallized and modified dihydrate gypsum from the recrystallization reaction tank are controlled such that the feed rate and the discharge rate become substantially equal to each other, whereby the feeding of the hemihydrate gypsum and the discharging of the recrystallized and modified dihydrate gypsum are conducted continuously or intermittently. According to the process, dihydrate gypsum as a starting raw material can be converted into high-purity, modified dihydrate gypsum of large crystals by recrystallizing the starting dihydrate gypsum after it is once calcined into hemihydrate gypsum although such modified dihydrate gypsum is not available in general. | 06-09-2011 |
20100190017 | GYPSUM BOARD HAVING MOLD RESISTANCE - A gypsum board having mold resistance includes a gypsum core containing a first anti-mold agent poorly soluble in water and a waterproofing agent; and gypsum board paper containing a second anti-mold agent poorly soluble in water. | 07-29-2010 |
20100048372 | SCORING DEVICE FOR GYPSUM BOARD PRODUCTION DEVICE - The invention provides a whetstone type of scoring device for production of gypsum boards which can accurately and stably form a groove of a constant depth on a sheet of paper for gypsum board liner, and which can prevent wear of a rotary blade and a backing block. The scoring device ( | 02-25-2010 |
20090256291 | METHODS FOR MANUFACTURING A CALCINED GYPSUM AND A GYPSUM BOARD - The present invention provides a method for manufacturing a calcined gypsum wherein the mixing water amount is reduced and the setting time does not increase. As a raw gypsum is compounded with a carboxylic acid-type material and calcined, a calcined gypsum can be manufactured wherein the mixing water amount is small and the setting time does not increase. Furthermore, a regular gypsum board can be manufactured without reducing the productivity of the gypsum board even if a large quantity of recycled gypsum causing increase of the mixing water amount is used as a raw gypsum, because the mixing water amount is small and the setting time does not increase for the calcined gypsum manufactured as described above. | 10-15-2009 |