US2531016A - Treatment of fibro-cement products - Google Patents

Treatment of fibro-cement products Download PDF

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Publication number
US2531016A
US2531016A US616529A US61652945A US2531016A US 2531016 A US2531016 A US 2531016A US 616529 A US616529 A US 616529A US 61652945 A US61652945 A US 61652945A US 2531016 A US2531016 A US 2531016A
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US
United States
Prior art keywords
elements
moisture content
cement
sheets
pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US616529A
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English (en)
Inventor
Otto H Waechter
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Individual
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Individual
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Filing date
Publication date
Priority to BE497833D priority Critical patent/BE497833A/fr
Application filed by Individual filed Critical Individual
Priority to US616529A priority patent/US2531016A/en
Priority to GB19221/50A priority patent/GB677488A/en
Priority to FR1024159D priority patent/FR1024159A/fr
Application granted granted Critical
Publication of US2531016A publication Critical patent/US2531016A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245—Curing concrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
    • B28B11/0818—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for roughening, profiling, corrugating
    • B28B11/0827—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for roughening, profiling, corrugating for corrugating, profiling or the like of plates such as asbestos cement sheets

Definitions

  • This invention relates to the treatment of fibrocement products such as shingles, sidings, and the like to condition them in respect of their moisture content prior to pressing or texturing. More particularly, the invention relates to the treatment of such products made from laminated asbestos-cement sheet material produced on a wet machine by the well known Hatschek process.
  • a thin web of an aqueous mixture or slurry of Portland or hydraulic cement and asbestos or other mineral fibers, with or without other ingredients is formed on the endless belt or blanket of a wet machine of the cylinder or Fourdrinier type.
  • the web is carried by the belt to an accumulator drum or roll whereon it is wound, a number of times, until a laminated material of the desired thickness has been formed.
  • the material is then slit lengthwise of the drum, removed therefrom, and spread or opened out into a fiat sheet.
  • the sheet so produced is cut into elements such as shingles, sidings, and the like, which elements are subsequently subjected to a pressing operation to give them a finished textured or plain surface that enhancestheir appearance.
  • the pressing operation is performed either by means of a pressure roll or in a hydraulic press under high pressure.
  • the periphery of the pressure roll is formed to effect the texturing by contact pressure with a surface of the elements, or the elements are formed into a stack with suitable texture plates interposed between adjacent ones and the stack is pressed to effect the texturing.
  • the laminated asbestos-cement sheet material as it is removed from the accumulator drum and cut into elements, has a moisture content usually amounting to from about twenty-two to thirtyfive percent by weight. Prior to pressing or texturing the elements this normal moisture content must be substantially reduced because if the moisture content is too high deformation of the product will result in the pressing operation, while if it is toolow the product will crack.
  • the principal objectof the invention is to provide a method of conditioning the elements to effect a positive control of their moisture content prior to pressing or texturing.
  • Another object is to provide a method that requires no handling of the product from the time that the sheets are removed from the accumulator drum until after the blanks have been pressed or textured, and that results in reducing the cost of production.
  • a further object is to provide a method whereby pressing or texturing of the product is greatly accelerated and that results in the production of products of uniform quality and appearance.
  • the elements are carried from the cutter on a conveyor l5 to an endless belt or conveyor I 6 which progresses them through an elongated heating chamber l1 wherein they are conditioned by application of heat of a temperature above ordinary room temperature for a sufficient length of time to reduce their moisture content to about from fifteen to twenty-five percent by weight.
  • the conveyor It may operat continuously or intermittently.
  • the chamber I! may be heated by gas burners l8, electricity, radiant heat, or in any other suitable manner.
  • An important feature of the process consists in reducing the moisture content in the outer strata of the laminated elements uniformly prior to the application of pressure.
  • temperature and time are correlative factors, that is the time or rate of progress of the elements through the heating chamber may be shortened if the temperature is raised, or it may be lengthened if the temperature is decreased.
  • the absolute degree of temperature used is unimportant.
  • the elements On leaving the heating or conditioning chamber, the elements may be carried by the conveyor l6 through a coolin section I9 where they are somewhat cooled by exposure to the air.
  • the elements then pass to a conveyor 20 that carries them under a pressure roll 2i and over an opposition roll 22.
  • may be formed with a desired texture design, such as wood grain, stonework, etc., either in intaglio or relief, 50 as to impress or emboss the design on the surface of the elements.
  • a pressure roll any suitable press may be employed. Reduction of the moisture content results in a partial hardening of the elements to such a degree that they may be pressed without the excessive elongation or deformation that would occur if the blanks were not properly conditioned.
  • the pressed elements are delivered by a conveyor 23 and may then be trimmed, if necessary, packed in bundles or stacks and allowed to set and cure in the usual manner.
  • the process is continuous in the sense that no handling of the product is required from the time that the sheets have been stripped from the accumulator drum until after they have been conditioned and pressed. Moreover, the process is subject to definite control as to uniformity in the quality of production. In practice of the process, should it be found after the first element has been pressed that it had not been properly conditioned as toits moisture content, the temperature and/or time factors can easily be controlled to insure proper conditioning and uniformity of quality throughout the entire subsequent run.
  • a process of treating asbestos-cement products which consists in continuously and successively progressing a series of cut freshly formed laminated asbestos-cement sheets having 9, moisture content of from about 22 to 35% by weight first through a heating zone to condition the sheets for pressing by heating said sheets sufllciently to reduce the moisture content from the outer laminations to about 15% by weight, then through a cooling zone of room temperature, and finally subjecting the cooled moisture conditioned sheets to pressure to form a densified asbestoscement product.
  • a process of treatin asbestos-cement products which consists in continuously and successively progressing a series of freshly formed 1aminated asbestos-cement sheets having a moisture content of from about 22% to 35% by weight first through a heating zone to condition the sheets for pressing by heating said sheets sufliciently to reduce the moisture content from the outer laminations to about 15% by weight, then through a cooling zone of room temperature, and
  • a process of treating asbestos-cement products which consists in continuously and successively progressing a series of freshly formed laminated asbestos-cement sheets havin a moisture content of from about 22% to 35% by weight first through a heating zone to condition the sheets for pressing by heating said sheets sufliciently to reduce uniformly the moisture content from the outer laminations to about 15% by weight, then through a zone of room temperature, and finally subjecting the moisture conditioned sheets to pressure to form a densified asbestos-cement product.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
US616529A 1945-09-15 1945-09-15 Treatment of fibro-cement products Expired - Lifetime US2531016A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE497833D BE497833A (enrdf_load_stackoverflow) 1945-09-15
US616529A US2531016A (en) 1945-09-15 1945-09-15 Treatment of fibro-cement products
GB19221/50A GB677488A (en) 1945-09-15 1950-08-01 Improvements in or relating to the treatment of fibro-cement products
FR1024159D FR1024159A (fr) 1945-09-15 1950-08-31 Procédé de traitement de produits en asbeste-ciment

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US616529A US2531016A (en) 1945-09-15 1945-09-15 Treatment of fibro-cement products
GB19221/50A GB677488A (en) 1945-09-15 1950-08-01 Improvements in or relating to the treatment of fibro-cement products
FR1024159T 1950-08-31

Publications (1)

Publication Number Publication Date
US2531016A true US2531016A (en) 1950-11-21

Family

ID=78669038

Family Applications (1)

Application Number Title Priority Date Filing Date
US616529A Expired - Lifetime US2531016A (en) 1945-09-15 1945-09-15 Treatment of fibro-cement products

Country Status (4)

Country Link
US (1) US2531016A (enrdf_load_stackoverflow)
BE (1) BE497833A (enrdf_load_stackoverflow)
FR (1) FR1024159A (enrdf_load_stackoverflow)
GB (1) GB677488A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695549A (en) * 1949-02-17 1954-11-30 Johns Manville Asbestos millboard and method of manufacture
US2738713A (en) * 1952-09-18 1956-03-20 Keasbey & Mattison Method and apparatus for making decorated asbestos-cement sheet material
US2778088A (en) * 1950-12-23 1957-01-22 Southern Zonolite Company Manufacture of roofing slabs and the like
US2791159A (en) * 1952-03-26 1957-05-07 Victor Mfg & Gasket Co Method of making cement bound asbestos paper
US3202746A (en) * 1961-12-08 1965-08-24 Structural Clay Products Inst Method and apparatus for manufacturing small clay cylinders
US3954556A (en) * 1974-06-10 1976-05-04 Johns-Manville Corporation Inorganic composition for high temperature use and method of forming a millboard therefrom
US4468361A (en) * 1981-08-27 1984-08-28 Fulgurit Gmbh & Co. Kommanditgesellschaft Process for imparting surface-structures to wood-cement boards

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451812A1 (fr) * 1979-03-23 1980-10-17 Everitube Procede et machine de densification d'un materiau humide en plaques, notamment de plaques d'amiante-ciment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1332457A (en) * 1918-12-12 1920-03-02 John A Scharwath Press for making concrete slabs
US1785357A (en) * 1927-11-07 1930-12-16 Flintkote Co Waterproof fibrous product
GB354001A (en) * 1929-07-13 1931-08-06 Hubert Leopold Becher Pulp board and method of making the same
US1927047A (en) * 1931-11-18 1933-09-19 Lancaster Processes Inc Fibrous product and method of making the same
US2006392A (en) * 1933-04-10 1935-07-02 Carey Philip Mfg Co Material and article containing fiber and method of making the same
US2348804A (en) * 1940-04-11 1944-05-16 Patent & Licensing Corp Method of manufacturing asbestoscement shingles or the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1332457A (en) * 1918-12-12 1920-03-02 John A Scharwath Press for making concrete slabs
US1785357A (en) * 1927-11-07 1930-12-16 Flintkote Co Waterproof fibrous product
GB354001A (en) * 1929-07-13 1931-08-06 Hubert Leopold Becher Pulp board and method of making the same
US1927047A (en) * 1931-11-18 1933-09-19 Lancaster Processes Inc Fibrous product and method of making the same
US2006392A (en) * 1933-04-10 1935-07-02 Carey Philip Mfg Co Material and article containing fiber and method of making the same
US2348804A (en) * 1940-04-11 1944-05-16 Patent & Licensing Corp Method of manufacturing asbestoscement shingles or the like

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695549A (en) * 1949-02-17 1954-11-30 Johns Manville Asbestos millboard and method of manufacture
US2778088A (en) * 1950-12-23 1957-01-22 Southern Zonolite Company Manufacture of roofing slabs and the like
US2791159A (en) * 1952-03-26 1957-05-07 Victor Mfg & Gasket Co Method of making cement bound asbestos paper
US2738713A (en) * 1952-09-18 1956-03-20 Keasbey & Mattison Method and apparatus for making decorated asbestos-cement sheet material
US3202746A (en) * 1961-12-08 1965-08-24 Structural Clay Products Inst Method and apparatus for manufacturing small clay cylinders
US3954556A (en) * 1974-06-10 1976-05-04 Johns-Manville Corporation Inorganic composition for high temperature use and method of forming a millboard therefrom
US4468361A (en) * 1981-08-27 1984-08-28 Fulgurit Gmbh & Co. Kommanditgesellschaft Process for imparting surface-structures to wood-cement boards

Also Published As

Publication number Publication date
GB677488A (en) 1952-08-13
BE497833A (enrdf_load_stackoverflow)
FR1024159A (fr) 1953-03-30

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