Loading patent…
AssigneeYoshino Gypsum Co., Ltd.
InventorsKunitoshi Sasaki, Mikiyoshi Simojima, Shouichi Endo, Shinji Yonezawa
Estimating the term…
Provided are a process and an apparatus for producing gypsum boards, both of which feature minimized occurrence of defective products and especially excellent continuous productivity and superb efficiency. Making use of the facts that lining paper sheets for gypsum boards are insulators and a gypsum slurry held between the lining paper sheets is a good electrical conductor, a detection of an electric current flowing between an upper forming unit and a lower forming unit or a like method makes it possible to promptly detect any localized tearing which may occur in the overlay paper and/or underlay paper due to an undesired object or the like mixed in during continuous production of gypsum boards and moreover, to readily remove the undesired object or the like as a cause for the tearing without stopping the production of gypsum boards while preventing the localized tearing from spreading over the entire width of the paper. The production process and apparatus, therefore, permit stable and continuous production of gypsum boards.
A process for producing gypsum board by holding a gypsum slurry at upper and lower surfaces thereof with an overlay paper and an underlay paper, respectively, and then causing a resulting perform to travel between and lower forming units, which are composed in combination of plated and/or forming rolls as an upper forming unit and a lower forming unit, while pressing said preform with said upper forming unit, which comprises:
A process for producing gypsum boards by holding a gypsum slurry at upper and lower surfaces thereof with an overlay paper and an underlay paper, respectively, and then causing a resulting preform to travel between an upper forming roll and a lower forming roll or between an upper forming roll or a lower plate while pressing said preform with said upper forming roll, which comprises:
An apparatus for producing gypsum boards by holding a gypsum slurry at upper and lower surfaces thereof with an overlay paper and an underlay paper, respectively, and then causing a resulting preform to travel between upper and lower forming units, which are composed in combination of plates and/or forming rolls as an upper forming unit and a lower forming unit, while pressing said preform with said upper forming unit, which comprises:
Dependencies are inferred from the claim text.