Process for making plaster board
AssigneeSaint-Gobain Industries
InventorsAdrien Delcoigne, Jacques Lanneau
Life of this patent
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Abstract
The present invention is concerned with manufacturing board from a fluid evolutive product, such as a plaster and water mixture. The process comprises pouring upon a conveyor a fluid evolutive product, such as a plaster and water mixture, contained in storage above the conveyor, through a transverse, parallel slit into which the product is introduced in continuous process through a number of nozzles which discharge into the storage product mass. A reinforcement may be introduced into the poured product. The invention offers as well mechanism for the implementation of the process and products manufactured by the process. Typically the invention is applied to plaster board manufacturing.
Claims27
A process for making a board from a fluid evolutive product including pouring said product into a reservoir located above a conveyor moving at a uniform speed, passing said product through a slit transverse to the conveyor so that the board is formed between the conveyor and the downstream wall of the reservoir, characterized by continuously introducing streams of fresh fluid evolutive product substantially horizontally into the reservoir through spaced nozzles discharging into the product in the reservior with such force as to eliminate dead spots and prevent premature hardening of said product.
A process for making a board from a fluid evolutive product including pouring said product into a reservoir located above a conveyor moving at a uniform speed through a slit transverse to the conveyor so that the board is formed between the conveyor and the downstream wall of the reservoir characterized by continuously agitating the fluid evolutive product in the reservoir by continuously introducing streams of fluid evolutive product substantially horizontally into the product in the reservoir with such force as to eliminate dead spots.
A continuous process of making plaster board comprising the steps of
- pouring a supply of plaster powder at a constant rate into a mixing tank,
- pouring a quantity of water into the mixing tank at a constant rate,
- directing a portion of the water along the walls of the tank to flush it and keep it clean,
- directing a portion of the water at the shaft of a turbine to flush it and keep it clean,
- mixing the plaster powder and water with the impeller of the turbine and throwing the mixture outwardly to create a single vortex about a vertical center line,
- mixing the plaster powder in the tank for a time in the range of 15 to 30 seconds,
- discharging the mixture from the bottom of the tank into an ejection device,
- discharging the mixture from the bottom of the ejection device in a tangential manner,
- passing the mixture into a valve having an elastic sleeve forming an orifice,
- sensing the level of the mixture in the tank by weighing the tank and mixture,
- controlling the size of the valve orifice in accordance with the tank mixture level in order to maintain that level and the time of the mixture in the tank,
- vibrating the valve sleeve to prevent deposit of mixture thereon,
- passing the mixture to a distributor,
- distributing the mixture from the distributor to a number of nozzles,
- ejecting the mixture through the nozzles into a trough of the mixture and spreading the mixture transversely,
- creating a number of horizontal vortices to spread the mixture laterally in the trough and prevent any dead spots and deposit of the mixture,
- moving the mixture horizontally on a moving conveyor through at slit to form a flat sheet,
- reinforcing the mixture by adding reinforcement material to the mixture before it sets, and
- allowing the mixture to set to form plaster board.
A process for making a board from a fluid evolutive product including
- pouring said product into a reservoir above a conveyor moving at a uniform speed through a slit transverse to the conveyor so that the board is formed between the conveyor and the downstream wall of the reservoir, characterized in that
- streams of fresh fluid evolutive product are introduced continuously into the reservoir through spaced nozzles discharging into the product in the reservoir,
- said streams being introduced horizontally and with such force as to create agitation along closed flow lines and to eliminate dead spots in the product in the reservoir.
Dependencies are inferred from the claim text.