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Manufactory factory wall, partition, binders and raw materials for them

Manufactory factory wall, partition, binders and raw materials for them

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EP2036869A1 - Process for producing calcined gypsum and gypsum board - Google Patents

VIDEO ON THE TOPIC: Different Types of Wall Partitions used in Home Designing

Effective date : Kind code of ref document : A1. 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.

A calcined gypsum is manufactured by separately calcining or mixing and calcining raw gypsums such as chemical gypsums and natural gypsums so that the raw gypsum which is mainly dihydrate gypsum is principally converted into hemihydrate gypsum. An appropriate amount of water is added into the calcined gypsum obtained as described above to provide a slurry which is a dihydrate and hardens rapidly and therefore is preferably used for raw materials of various gypsum products, for example, used as a raw material for manufacturing of a gypsum board.

A gypsum board is a board-shaped one in which a core based on dihydrate gypsum is covered with a base paper for gypsum board, wherein, as for manufacturing thereof, a calcined gypsum, a bonding aid, a hardening accelerator, foam for lightening thereof, another additive, and the like, and further an admixture and water are kneaded, and thus obtained calcined gypsum slurry is poured into between upper and lower base papers for gypsum board, shaped into a board-like one, and subsequently cut roughly after hardening thereof, and cut into a product dimension after forced drying thereof.

The gypsum boards manufactured as described above have been widely used as interior materials for building in view of the fire-protection and fire-proof properties, sound-insulating property, workability, economical efficiency thereof and the like. Recently, while the recycle rate of waste gypsum boards at the time of new construction or demolition to gypsum board manufacturers has increased due to the social demand of volume reduction of industrial wastes, the compounding ratio of recycled gypsum in a raw gypsum for gypsum board is increased accordingly.

However, with increase of the recycle rate, there are problems of increase of the amount of mixing water for calcined gypsum to provide a calcined gypsum slurry with an appropriate fluidity, mainly caused by a fine gypsum crystal of a recycled gypsum, increase of drying energy required for increasing extra water that has to be dried out in a process for drying a gypsum board, and considerable lowering of the productivity of a gypsum board.

The following prior art is provided for reducing the amount of mixing water for calcined gypsum which is used for manufacturing a gypsum board. However, in this method, there is a problem that the rate of manufacturing of a gypsum board is forced to be reduced by increase of the setting time although the mixing water amount of a calcined gypsum can be reduced and a necessary drying energy can be reduced, or a large quantity of a setting accelerator has to be used in order not to reduce the rate of manufacturing of a gypsum board, thereby degrading the various physical properties of the gypsum board.

Furthermore, a new water addition treatment apparatus and a dryer for drying out free water remaining in a calcined gypsum after the water addition treatment are needed for this method, and there is a problem that the complexity of equipment or increase of the installation cost thereof is caused thereby increasing the cost for manufacturing a calcined gypsum.

The present invention relates to a method for manufacturing a calcined gypsum which is obtained by calcining a raw gypsum and aims to provide a calcined gypsum wherein increase of the mixing water amount is not caused and the setting time does not increase even if a recycled gypsum is used as a raw gypsum.

Another object of the present invention is to provide a method for manufacturing a gypsum board wherein a calcined gypsum obtained by the manufacturing method as described above is utilized. The inventors have actively conducted study, and as a result, have found that a calcined gypsum wherein the mixing water amount is small and the setting time does not increase can be obtained by compounding and calcining a raw gypsum with a carboxylic acid-type material, so as to have led to the present invention.

That is, a method for manufacturing a calcined gypsum according to the invention as recited in claim 1 is characterized in that a raw gypsum is compounded with a carboxylic acid-type material and calcined. A method for manufacturing a calcined gypsum according to the invention as recited in claim 2 is the method for manufacturing a calcined gypsum according to the invention as recited in claim 1, characterized in that the carboxylic acid-type material to be compounded with a raw gypsum is at least one kind of, succinic acid and salts thereof, malic acid and salts thereof, citric acid and salts thereof, tartaric acid and salts thereof, maleic acid and salts thereof, and gluconic acid and salts thereof.

A method for manufacturing a calcined gypsum according to the invention as recited in claim 3 is the method for manufacturing a calcined gypsum as recited in claim 1 or 2, characterized in that a proportion of the carboxylic acid-type material to be compounded with a raw gypsum is 0. A method for manufacturing a calcined gypsum according to the invention as recited in claim 4 is the method for manufacturing a calcined gypsum as recited in any of claims 1 to 3, characterized in that the raw gypsum comprises a recycled gypsum.

A method for manufacturing a gypsum board according to the invention as recited in claim 6 is characterized in that a calcined gypsum obtained by the method as recited in any of claims 1 to 5 is used. According to the present invention, a calcined gypsum wherein the mixing water amount is small and the setting time does not increase can be manufactured, as a raw gypsum is compounded with a carboxylic acid-type material and calcined.

Furthermore, a gypsum board can be manufactured without reducing the productivity in the case where the gypsum board is produced, because the mixing water amount is small and the setting time does not increase for a calcined gypsum manufactured as described above even if a large quantity of recycled gypsum causing increase of a mixing water amount is used as a raw gypsum.

Some embodiments of the present invention will be described below. A calcined gypsum according to the present invention is manufactured by compounding a raw gypsum with a carboxylic acid-type material and subsequently making calcination thereof.

The compounding quantity of the carboxylic acid-type material s is 0. If the compounding quantity of the carboxylic acid-type material s is less than 0. For a raw gypsum in the present invention, a natural gypsum or a chemical gypsum such as a neutralized gypsum or a by-product gypsum can be used solely or a combination of two or more kinds thereof can be used. For representative chemical gypsums, phosphogypsum, fluorogypsum, titanogypsum, desulfogypsum, and the like can be provided, for example.

Furthermore, the raw gypsum according to the present invention can include a recycled gypsum. The recycled gypsum may be any of recycled gypsums recovered from waste gypsum boards self-produced by a gypsum board manufacturer, waste gypsum boards produced at the time of new construction or demolition, and the like.

If the recycle rate is too small, a recycled gypsum to be recovered cannot fully be treated, and if the recycle rate is too large, an obtained calcined gypsum is a fine crystal with a large specific surface area due to a fine gypsum crystal of the recycled gypsum and the amount of mixing water for manufacturing a gypsum board is unfavorably large.

In regard to calcination, a calcined gypsum is obtained by calcining a raw gypsum compounded with a carboxylic acid-type material in an ordinary method using a calcination device such as a kettle or rotary kiln to be used by a person skilled in the art. The calcination device to be used is not particularly limited. In the present invention, a calcined gypsum obtained after calcination may be further pulverized by using a pulverizing apparatus such as a tube mill.

Thus obtained calcined gypsum is kneaded with a bonding aid, a hardening accelerator, foam for lightening, another additive, and the like and further an admixture and water and thus obtained calcined gypsum slurry referred to as "slurry" below is poured into between upper and lower base papers, shaped into a board-like one by passing through between shaping rolls arranged vertically or between upper and lower plates, subsequently hardened on a conveyor belt, cut roughly, and cut into a product dimension after forced drying thereof, so that it can be utilized effectively as a raw material for manufacturing a normal gypsum board to be produced.

Next, the present invention is illustrated by some practical examples. However, these practical examples merely illustrate one embodiment of the present invention and the present invention is not limited to these examples at all.

The samples of calcined gypsum obtained in practical examples 1 - 16 and comparison examples 1 - 2 were used to perform tests of their physical properties, that is, the mixing water amount and setting time thereof. The test methods of the mixing water amount and setting time of a calcined gypsum were in accordance with JIS R Each of the test results and raw material formulations is shown in Table 1.

While the mixing water amount of the calcined gypsum obtained in any of practical examples 1 - 16 and comparison examples 1 - 2 increased with increasing the compounding ratio of the recycled gypsum to the raw gypsum, there was found no change in the setting time with respect to the difference between the compounding ratios of the recycled gypsum.

Accordingly, it was confirmed that the effect of educing the mixing water amount was improved by increasing the loading of succinic acid from 0. It was shown that the mixing water amount of the calcined gypsum obtained in practical example 3 was comparable to that of the calcined gypsum obtained in practical example 2.

Accordingly, it was confirmed that the effect of further reducing the mixing water amount was not sufficiently exerted by increasing the compounding ratio of succinic acid from 2. It was shown that the mixing water amount and setting time of the calcined gypsum obtained in any of practical examples 4 - 16 were comparable to those of the clacined gypsum obtained in practical example 1.

As described above, it was confirmed that a raw gypsum was compounded with a carboxylic acid-type material and calcined according to the present invention so that a calcined gypsum wherein the mixing water amount is small and the setting time is short can be manufactured. Additionally, the present application claims the priority based on Japanese Parent Application No.

A method for manufacturing a calcined gypsum, characterized in that a raw gypsum is compounded with a carboxylic acid-type material and calcined. The method for manufacturing a calcined gypsum, characterized in that the carboxylic acid-type material to be compounded with a raw gypsum is at least one kind of, succinic acid and salts thereof, malic acid and salts thereof, citric acid and salts thereof, tartaric acid and salts thereof, maleic acid and salts thereof, and gluconic acid and salts thereof.

The method for manufacturing a calcined gypsum as claimed in claim 1 or 2, characterized in that a proportion of the carboxylic acid-type material to be compounded with a raw gypsum is 0. The method for manufacturing a calcined gypsum as claimed in any of claims 1 to 3, characterized in that the raw gypsum comprises a recycled gypsum.

A method for manufacturing a gypsum board, characterized in that a calcined gypsum obtained by the method as claimed in any of claims 1 to 5 is used.

USB2 en. EPA4 en. JPB2 en. KRB1 en. CNA en. AUB2 en. BRPIA2 en. CAC en. HKA1 en. MXA en. NOL en. RUA en. TWIB en. WOA1 en. CNB en.

Gypsum composition, gypsum slurry, gypsum hardened body, gypsum-based construction material, gypsum board, and method for producing gypsum-based construction material. BRA en. An improved process for making gypsum board and improved process for preparing and manufacturing calcined gypsum. DEC2 en. JPHB2 en. A process for preparing settable calcium sulphates from calcium sulphate dihydrate.

Process for the production of alpha hemihydrate calcium sulfate from flue gas sludge. Method and system for multi-stage calcining of gypsum to produce an anhydrite product. FGD gypsum dewatering improvement through crystal habit modification by carboxylic acids. JPA en. Process for manufacturing ready-mixed setting alpha-calcium sulphate hemi-hydrate and kit for same. EPB1 en. USA1 en. KRA en. CAA1 en. JPWOA1 en. TWA en. AUA1 en.

Dry gypsum cement mixture and method for producing outdoor gypsum cement using the mixture. USA en. Use of salts of water soluble condensation products of naphthalene sulfonic acid and formaldehyde as an additive for inorganic binders and building materials.

CAA en. JPB6 en. Low density calcium silicate hydrate strength accelerator additive for cementitious products. Method for manufacturing fire-resistant lightweight building elements with accurate dimensions. EPA2 en. TWB en. EPA1 en.

JPHA en. Use of sepiolite in manufacturing processes of fiber reinforced products containing mica.

Drywall also known as plasterboard , wallboard , sheet rock , gypsum board , buster board , custard board , or gypsum panel is a panel made of calcium sulfate dihydrate gypsum , with or without additives, typically extruded between thick sheets of facer and backer paper , used in the construction of interior walls and ceilings. In the midth century, drywall construction became prevalent in North America as a time and labor saving alternative to traditional lath and plaster. The first plasterboard plant in the UK was opened in in Rochester, Kent.

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A review of natural fibers and processing operations for the production of binderless boards

Lightweight framed construction is the most common construction system in Australia. The two most commonly used framing materials — steel and timber — can contribute to the comfort, appeal and environmental performance of your home. Although lightweight framed construction can be used for floors, walls and roofs, the focus of this article is on wall systems. Timber from sustainable sources provides a renewable building material that takes in carbon from the atmosphere while growing and stores it for the life of the building. Its greatest enemy is the termite, although rot and mould from condensation is becoming an increasingly critical threat as we seal our homes and increase insulation levels.

Bamboo Based Biocomposites Material, Design and Applications

Decreasing wood supplies and the need for formaldehyde-free particleboard have become important issues. This has led to studies about the use of raw materials other than wood, along with the manufacture of particleboard without using any synthetic adhesives. This paper presents an overview of the development of binderless boards from natural fibers using a diverse range of manufacturing processes, such as heat and steam treatments. The features of binderless boards produced with various parameters, such as pressing parameters, particle sizes, and additional substances, under various manufacturing processes, are discussed. Based on the availability of natural fibers, binderless boards are typically evaluated for their physical, mechanical, and thermal properties. Particleboard is a wood-based composite consisting of various shapes and sizes of lignocellulosic particles bonded with an adhesive and consolidated under heat and pressure.

It's a stupid and shortsighted policy, and other nations are putting us to shame. The Hemp Technologies Collective is uniquely positioned and very proud to offer their hempcrete workshop participants a world class team comprised entirely of industry leaders, experienced hempcrete builders and professional instructors from around the world who are immersed in.

Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. TABLE 7. While advances in extraction technology are capable of easing our dependence on foreign sources of raw materials, improved technology in other stages of the materials cycle could enhance the effectiveness of materials utilization and hence relieve pressure on new supply. Figure 2. A strong materials technology is a key element in permitting industry to be responsive to these pressures and yet still produce goods at reasonable cost. Consideration was directed in Chapter 2 to the changing world conditions in which the institutions of the materials field—in industry, government, and universities—must function. The features are highlighted by examining three key materials-producing industries metals, inorganic nonmetals, and plastics , and five industries that are major users of materials electronics, lighting, containers, automobile, and building. Finally, in the closing part of this section, the important role of materials standards and specifications is reviewed.

Original:Small scale Manufacture of Compound Animal Feed 7

Cork is a material which has been used for mankind for the last 5, years and it is a strategic material used for multiple applications, from wine bottles to aeronautics. Many of current cork materials are composites, in particular cork materials for floor and wall coverings and several other building and industrial applications. Recent developments in cork research have shifted from the classical cork-wine relationship to quality and environmental issues, exploitation of cork industry residues and new cork based materials.

Do not change the body text. We do not have permission to modify this work. Treat it as open access , which is an exception to the Appropedia license.

Effective date : Kind code of ref document : A1. 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. A calcined gypsum is manufactured by separately calcining or mixing and calcining raw gypsums such as chemical gypsums and natural gypsums so that the raw gypsum which is mainly dihydrate gypsum is principally converted into hemihydrate gypsum. An appropriate amount of water is added into the calcined gypsum obtained as described above to provide a slurry which is a dihydrate and hardens rapidly and therefore is preferably used for raw materials of various gypsum products, for example, used as a raw material for manufacturing of a gypsum board. A gypsum board is a board-shaped one in which a core based on dihydrate gypsum is covered with a base paper for gypsum board, wherein, as for manufacturing thereof, a calcined gypsum, a bonding aid, a hardening accelerator, foam for lightening thereof, another additive, and the like, and further an admixture and water are kneaded, and thus obtained calcined gypsum slurry is poured into between upper and lower base papers for gypsum board, shaped into a board-like one, and subsequently cut roughly after hardening thereof, and cut into a product dimension after forced drying thereof. The gypsum boards manufactured as described above have been widely used as interior materials for building in view of the fire-protection and fire-proof properties, sound-insulating property, workability, economical efficiency thereof and the like. Recently, while the recycle rate of waste gypsum boards at the time of new construction or demolition to gypsum board manufacturers has increased due to the social demand of volume reduction of industrial wastes, the compounding ratio of recycled gypsum in a raw gypsum for gypsum board is increased accordingly.

The manufacture of cob granules was carried out in two technological lead to the need to find ways improving the thermal properties of manufactured wall insulating materials based on vegetable raw materials for a comparative main components of thermal insulation products based on plant shive are a binder.

Cork Composites: A Review

Siti Suhaily, H. Abdul Khalil, W. Wan Nadirah and M. Materials Science - Advanced Topics. Bamboo or Bambusa in botanical has subfamilies of genres and there are difference species ranging from the type of wood to bamboo herb. However, each particular species of bamboo has different properties and qualities [ 1 ]. Bamboo productions dated back to thousands of years ago and thus they are rich with traditional elements. Bamboo naturally, suitable for varieties of uses and benefits. Bamboo often used as materials for constructions or used as the raw materials for the production of paper sheet, they are also used to control erosion and also for embellishments. Therefore, bamboo plant is sometimes regarded by some people as having positive features towards life such as properity, peace and mercy [ 3 ].

Lightweight framing

Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. The most common types of plaster mainly contain either gypsum , lime , or cement , [3] but all work in a similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface. The reaction with water liberates heat through crystallization and the hydrated plaster then hardens. Plaster can be relatively easily worked with metal tools or even sandpaper , and can be moulded, either on site or to make pre-formed sections in advance, which are put in place with adhesive.

Developments in the Formulation and Reinforcement of Concrete, Second Edition, presents the latest developments on topics covered in the first edition. In addition, it includes new chapters on supplementary cementitious materials, mass concrete, the sustainably of concrete, service life prediction, limestone cements, the corrosion of steel in concrete, alkali-aggregate reactions, and concrete as a multiscale material.

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Regret for the inconvenience: we are taking measures to prevent fraudulent form submissions by extractors and page crawlers. Received: May 19, Published: December 4, MOJ Civil Eng 3 5 : DOI:

Линия Джаббы оказалась занята, а службу ожидания соединения Джабба отвергал как хитрый трюк корпорации Американ телефон энд телеграф, рассчитанный на то, чтобы увеличить прибыль: простая фраза Я говорю по другому телефону, я вам перезвоню приносила телефонным компаниям миллионы дополнительных долларов ежегодно.

Отказ Джаббы использовать данную услугу был его личным ответом на требование АН Б о том, чтобы он всегда был доступен по мобильному телефону. Чатрукьян повернулся и посмотрел в пустой зал шифровалки.

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