US3806389A - Method and apparatus for forming a lined folded edge on plasterboard - Google Patents

Method and apparatus for forming a lined folded edge on plasterboard Download PDF

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Publication number
US3806389A
US3806389A US00271464A US27146472A US3806389A US 3806389 A US3806389 A US 3806389A US 00271464 A US00271464 A US 00271464A US 27146472 A US27146472 A US 27146472A US 3806389 A US3806389 A US 3806389A
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US
United States
Prior art keywords
edge
board
sheet
cut
edges
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
US00271464A
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English (en)
Inventor
T Gwynne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BPB Ltd
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BPB Industries PLC
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Filing date
Publication date
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Publication of US3806389A publication Critical patent/US3806389A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/043—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1007—Running or continuous length work
    • Y10T156/1008—Longitudinal bending
    • Y10T156/1011—Overedge bending or overedge folding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1034—Overedge bending of lamina about edges of sheetlike base
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/125—Plural severing means each acting on a different work piece
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/232—Encased layer derived from inorganic settable ingredient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24777—Edge feature

Definitions

  • the invention relates to forming a sheet facing or lining on cut edges of plaster or gypsum board.
  • the core and backing sheet of the board are cut back, leaving a part of the facing sheet projecting beyond the cut edge.
  • the edge of the backing sheet and inner surface of the projecting part of the facing sheet are thinned, and the projecting part of the facing sheet is then folded over the edge of the core and is bonded to the thinned edge of the backing sheet.
  • the steps can be performed continuously on advancing plasterboard.
  • the invention is useful for restoring edges of damaged or cut boards and in forming from preformed board, smaller panels or tiles which can have all their edges lined or faced with sheet material.
  • the present invention relates to the manufacture of plasterboard, and more particularly to the reconstitution of the edges of cut or damaged board.
  • a slurry of gypsum plaster is cast between lining sheets, commonly of paper.
  • the paper in contact with the casting table or surface, which forms the face of the board and is commonly known as the cream paper from its usual color, has its lateral edges folded upwards to enclose the cast slurry and then inwards over the edge of the formed slurry.
  • the paper which is laid on top of the slurry, and which is commonly known as the grey paper, is laid over the inwardly turned edges of the cream paper and adhered thereto.
  • the lateral edges of the board are thus completely enclosed by the lining papers, which serves to protect and strengthen the edges and to restrict absorption of water.
  • facing sheet and backing sheet will be used for convenience in a board functional sense as indicating the relationship a particular sheet has to the board as a whole and to its production, and thus correspond respectively to the cream paper and grey paper.
  • the lining sheets can be of any desired color and that, for particular end uses, sheets of materials other than paper, for example of plastics material, may be preferred.
  • the present invention now provides a method and apparatus by which a lined edge can be formed at the edges of cut or damaged plasterboard, so that the strength and resistance to damage of the edges concerned is restored.
  • the core of the board to be treated is cut back along an edge thereof to a desired line and the backing sheet is cut back to the same extent; the outer surface of the backing sheet and the exposed inner surface of the now projecting part of the facing sheet are thinned along their respective edge regions; and the projecting part of the facing sheet is folded over the cut edge of the core and turned over and adhesively bonded to the thinned edge of the backing sheet.
  • the inner surface of the facing sheet, especially where the sheet is of paper, is preferably scored along the line of the cut edge of the core to a sharp and regular fold.
  • apparatus for forming a lined edge on the cut edge of plasterboard comprising a flat bed over which the board can be advanced, a first cutter adjacent to the bed and adapted to make a horizontal cut in the edge of the board at a height above the bed equal to the thickness of the facing sheet, a second cutter adjacent to the bed and spaced from the first cutter in the direction of advance of the board along the bed and adapted to remove from the board the portion of the core and the backing sheet overlying the said horizontal cut, means for thinning the outer surface of the backing sheet and the inner surface of the facing sheet along their respective edge regions, means for applying adhesive to at least one of the sheet surfaces to be bonded, and folding guides alongside the bed to fold the edge portion of the facing sheet upwards and inwards to bond it to the edge region of the backing sheet.
  • the first cutter is preferably preceded by a cutter which trims the edge of the advancing board accurately to the appropriate width before reconstitution of the lined edge is begun.
  • the apparatus is preferably also provided with means for advancing the board at
  • the invention provides a plasterboard along at least one edge of which the facing sheet is folded over the edge surface of the core and over the edge portion of the backing sheet, the overlapping portions of the lining sheets being thinner than the main portions of the sheet and the facing sheet being adhesively bonded on top of the backing sheet.
  • the board diifers from conventional board, where the backing sheet is bonded at the lateral edges on top of the overfolded edges of the facing sheet.
  • the second cutter includes a rotary cutting blade mounted on a horizontal axis and spaced from the bed sufficiently to permit cutting of the backing sheet and the core and partial cutting through the thickness (scoring) of the facing sheet, and auxiliary blades rotating about the same axis as the rotary blade and respectively spaced from the bed to remove part only of the thickness of the facing sheet as it passes along the bed and of the backing sheet on the upper surface of the board.
  • the adhesive employed to bond the sheets together is preferably a hot melt adhesive, since this gives a virtually instant bond and facilitates handling of the board after the edge treatment.
  • the invention can be used to make lined-edge board of narrower widths from previously formed, lined gypsum board. Apart from the economical manufacture of narrow board from standard width board, it is also possible to make use of damaged board which might otherwise be scrap. Furthermore, theinvention makes it possible to produce gypsum tiles having fully lined edges on all four sides, as compared with conventional cut lengths of plasterboard, which have lined edges only at the longitudinal edges. A further advantage of the invention is that it can be employed to give edges of greater accuracy than is usually achieved in casting board, so that the resulting panels and tiles can be fitted more closely together in dry constructions to give very fine joints which may need no filling before decoration.
  • FIG. lA-E shows in diagrammatic cross section five stages in the manufacture of a paper-edged board in accordance with this invention
  • FIG. 2 is a general side elevation of apparatus according to this invention for making a paper edge on gypsum board
  • FIG. 3 is an enlarged detailed cross section along the line 3-3 in FIG. 2.
  • FIG. 1A there is shown a gypsum board which has been cut longitudinally into a working piece a of the desired width and a remainder 10b.
  • the original board was fully paper-lined and had lined edges at which the thin edges of the grey paper 11 was laid over and adhered to the inturned edges of the cream paper 12.
  • the core 13 of the workpiece 10a is cut back or rebated at 14, immediately above the cream paper, leaving an edge portion 12a of the latter projecting.
  • the unwanted portion of the core and the grey paper are removed, to leave a board which has the final desired width less the thickness of the cream paper.
  • the inner surface of the cream paper is scored at the base 15 of the projecting portion 12a, and the edges of the same portion and of the grey paper are thinned at 1211 and 11b respectively.
  • a band or head of hot melt adhesive is applied at 16 to the upper surface of the projecting portion 12a of the cream paper.
  • the cream paper is folded up against the edge of the core and the edge 12b is folded over on top of the thinned edge 11b of the grey paper.
  • the adhesive is caused to flow round the edge of the board by the pressure on the paper and secures the paper 12 to the edge of the core and the edge of the grey paper.
  • FIGS. 2 and 3 Suitable apparatus for performing the invention is shown in FIGS. 2 and 3.
  • a bed for example a fiat table 20 is provided along which a length of plasterboard to be treated can be advanced. It is desirable that means should be provided for advancing the board at constant speed by a positive drive; any suitable mechanism can be used, and the drive is here omitted from the drawing for the sake of clarity.
  • an electrically driven circular cutter 21 is fitted to cut the incoming board to the desired working width, which is somewhat wider than the finished width of the cut board. If desired, this preliminary out can be carried out elsewhere, as it is not necessary in every case to provide such a cutter on the apparatus of this invention.
  • an electrically driven circular cutter 22 which, unlike the first-mentioned cutter 21, operates in the horizontal plane and rotates about a vertical axis.
  • the blade 23 of the cutter 22 is set at a distance above the bed 20 equal to the thickness of the cream paper of the board to be processed (so as to make a cut as shown at 14 in FIG. 1B) and for this reason is preferably adjustable. If an edge formation as taught in the aforesaid US. patent is desired, blade 23 can be replaced with one having the proper contour edge. That is, the edge must be concaved to give a prescribed cut core surface 14 which is convex.
  • a further cutter 24 which includes blades to perform the various operations shown in FIG. 1C.
  • the cutters 22 and 24 are preferably provided with a dust collection box 25 or hood which is connected by ducts to a dust extractor.
  • the cutter 24 is best seen in FIG. 3, and includes a circular cutting blade 26 rotating in a vertical plane, which severs the unwanted portion of the core of the board and the grey paper and scores the inner surface of the cream paper to facilitate folding.
  • the height of this blade above the bed is preferably adjustable.
  • a guide or diverter 27 is mounted near the blade 26 to lead off the severed portion of the core.
  • a compressed air jet nozzle 31 which is a preferred fitting and serves to remove dust particles from the board before the adhesion stages.
  • An adhesive applicator 32 follows which, if a hot melt adhesive is used, is connected by lines 33 to a heated adhesive supply and pressure vessel.
  • the next length of the bed 20 is provided with folding guides to engage the edge of the cream paper of the advancing board and turn it upwards and inwards over the edge of the grey paper.
  • the folding guides 34 are preferably spring loaded, as indicated by the springs 35.
  • the cutters 21, 22, and 24, the air nozzle 31, adhesive applicator 32 and folding guides 34 are still arranged along one side of the bed 20.
  • a guide 36 or series of guides to ensure that boards passing through the apparatus keep accurately to the prescribed path and emerge at the desired width.
  • Such guides are preferably adjustable so that the machine can handle boards of various widths.
  • a process according to claim 1 including the step of scoring the inner surface of the facing sheet along a line adjacent to the cut edge of the core before folding it 5 6 over the cut edge whereby a sharp and regular fold is 6.
  • the apparatus as defined in claim 5, and further obtained. including means for scoring the inner surface of the facing 3.
  • a process according to claim 2 wherein the facing sheet along a line adjacent to the cut edge of the core. sheet and the backing sheet are of paper.
  • 52417 X thinning means for removing the backing sheet and the 1,575,342 3/ 1926 s n 52596 exposed inner surface of the projecting facing sheet 15 along their respective edge regions;
  • PHILIP DIER Pnmary Exammer folding means for folding the thinned edge region of U S Q XR the projecting facing sheet over the cut core and over the thinned edge of the backing sheet; and 52417, 596; 156-216, 296, 443, 511; 161-43, 44, 99,

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Laminated Bodies (AREA)
  • Finishing Walls (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
US00271464A 1971-07-15 1972-07-13 Method and apparatus for forming a lined folded edge on plasterboard Expired - Lifetime US3806389A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3335471A GB1396288A (en) 1971-07-15 1971-07-15 Manfuacture of plasterboard

Publications (1)

Publication Number Publication Date
US3806389A true US3806389A (en) 1974-04-23

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ID=10351844

Family Applications (1)

Application Number Title Priority Date Filing Date
US00271464A Expired - Lifetime US3806389A (en) 1971-07-15 1972-07-13 Method and apparatus for forming a lined folded edge on plasterboard

Country Status (15)

Country Link
US (1) US3806389A (de)
AU (1) AU4459872A (de)
BE (1) BE786293A (de)
CA (1) CA979345A (de)
CH (1) CH541425A (de)
DE (1) DE2234482A1 (de)
ES (1) ES404706A1 (de)
FR (1) FR2146064A5 (de)
GB (1) GB1396288A (de)
IE (1) IE36535B1 (de)
IT (1) IT962871B (de)
LU (1) LU65731A1 (de)
NL (1) NL7209634A (de)
SE (1) SE376272B (de)
ZA (1) ZA724699B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181767A (en) * 1977-04-25 1980-01-01 Hoechst Aktiengesellschaft Plaster board panels
US4313614A (en) * 1978-06-26 1982-02-02 Trak Incorporated Ski and its manufacture
US4322929A (en) * 1980-03-12 1982-04-06 The Specialty Papers Company Packaging method using an adhesive coated web
US4584224A (en) * 1985-03-18 1986-04-22 National Gypsum Company Tapered edge board
US6655434B2 (en) 2000-02-01 2003-12-02 Peter Danko Apparatus for closing an open end of a product, and product formed thereby
US6931814B2 (en) 2000-10-05 2005-08-23 Stephen A. Henits Devices for positioning and tapering the edges of adjacent wallboards and methods for using same
WO2013089570A1 (en) * 2011-12-12 2013-06-20 Aron Consulting Llc Method and device for chamfering panels with a core encased in a liner
US20170174434A1 (en) * 2015-12-01 2017-06-22 Kingspan Insulated Panels, Inc. Panel Forming Assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412673A (en) * 1979-04-02 1983-11-01 Bechtel International Corporation Beaded liquid apparatus and method
DE10054978B4 (de) * 2000-08-26 2006-03-16 Karl Bauer Gipskarton-Platte mit einer randseitingen, sich über die ganze Länge eines Seitenrandes erstreckende Ausnehmung, Verfahren zur Herstellung und Verwendung derselben
DE102004053881B4 (de) * 2004-11-04 2008-11-13 Ima Klessmann Gmbh Holzbearbeitungssysteme Verfahren zum Fertigen von formatierten Leichtbauplatten
CN112207966A (zh) * 2020-09-22 2021-01-12 临沂周兴建材有限公司 天花板封边机

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181767A (en) * 1977-04-25 1980-01-01 Hoechst Aktiengesellschaft Plaster board panels
US4313614A (en) * 1978-06-26 1982-02-02 Trak Incorporated Ski and its manufacture
US4322929A (en) * 1980-03-12 1982-04-06 The Specialty Papers Company Packaging method using an adhesive coated web
US4584224A (en) * 1985-03-18 1986-04-22 National Gypsum Company Tapered edge board
US6655434B2 (en) 2000-02-01 2003-12-02 Peter Danko Apparatus for closing an open end of a product, and product formed thereby
US20040060644A1 (en) * 2000-02-01 2004-04-01 Peter Danko Method and apparatus for closing an open end of a product, and product formed thereby
US7951252B2 (en) 2000-02-01 2011-05-31 Peter Danko Method and apparatus for closing an open end of a product, and product formed thereby
US6931814B2 (en) 2000-10-05 2005-08-23 Stephen A. Henits Devices for positioning and tapering the edges of adjacent wallboards and methods for using same
WO2013089570A1 (en) * 2011-12-12 2013-06-20 Aron Consulting Llc Method and device for chamfering panels with a core encased in a liner
US20170174434A1 (en) * 2015-12-01 2017-06-22 Kingspan Insulated Panels, Inc. Panel Forming Assembly
US10882202B2 (en) * 2015-12-01 2021-01-05 Kingspan Insulated Panels, Inc. Panel forming assembly

Also Published As

Publication number Publication date
DE2234482A1 (de) 1973-01-25
CH541425A (de) 1973-09-15
AU4459872A (en) 1974-01-17
FR2146064A5 (de) 1973-02-23
SE376272B (de) 1975-05-12
LU65731A1 (de) 1972-10-30
IE36535L (en) 1973-01-15
ZA724699B (en) 1973-04-25
IT962871B (it) 1973-12-31
BE786293A (fr) 1972-11-03
GB1396288A (en) 1975-06-04
ES404706A1 (es) 1975-06-16
IE36535B1 (en) 1976-11-24
CA979345A (en) 1975-12-09
NL7209634A (de) 1973-01-17

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