US3635643A - Feeding device for sheet and planular blanks in multilayer presses - Google Patents

Feeding device for sheet and planular blanks in multilayer presses Download PDF

Info

Publication number
US3635643A
US3635643A US559854A US3635643DA US3635643A US 3635643 A US3635643 A US 3635643A US 559854 A US559854 A US 559854A US 3635643D A US3635643D A US 3635643DA US 3635643 A US3635643 A US 3635643A
Authority
US
United States
Prior art keywords
frame
sheets
sheet
press
feeding device
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
US559854A
Other languages
English (en)
Inventor
Rolf Bertil Reinhall
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.)
Valmet AB
Original Assignee
Defibrator AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Defibrator AB filed Critical Defibrator AB
Application granted granted Critical
Publication of US3635643A publication Critical patent/US3635643A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/20—Moulding or pressing characterised by using platen-presses
    • B27N3/22—Charging or discharging
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard

Definitions

  • ABSTRACT A feeding device for use in multipresses t or the production of sheets or boards of fibrous vegetable material by pressure between superimposed press plates.
  • the sheet or board blank is pressed between flexible foraminous metallic sheets such as sheets of wire cloth which are individually stretched in frames 398, 399 and held in their stretched condition therein while being inserted between the press plates; the frames being each of such 56] References Cited dimensions as to be located outside of the press plates so that pressure is not imposed on them and they receive a minimum UNITED STATES PATENTS of heat during the pressing operation and the flexible metallic sheets being secured in the frame only at the opposite ends of 1,005,706 /1911 Hloch ..162/399 the frame 1,587,462 6/1926 Adams et 211. .18/19 P UX 1,908,699 5/1933 Ellis 1 8/17 P UX 2 Claims, 4 Drawing Figures FUENTES JPN 8 I972 SHEET 1 BF 2 Fig.4
  • This invention relates to a feeding device for sheet or planular blanks in multilayer presses.
  • this invention relates to a feeding device in multilayer presses for the production of sheets or boards of cellulosic or other vegetable fibrous material, comprising a plurality of superimposed and press plates between which the sheets or board blanks are fed and subsequently subjected to pressure and possible heat.
  • the wire feeding system has since been replaced to a large extent by the so-called plate feed system, where the blanks are placed on conveying plates and then fed into the press.
  • the conveying plates are withdrawn from the press together with the finished sheets positioned thereon into a rack designed for this purpose.
  • the sheets are removed and the conveying plates then returned, by way of various different conveying means, to the feed side ready for the next working operation.
  • the plate feeding system has advantages, both concerning capacity and reliability. However, at the same time it has a plurality of annoying drawbacks.
  • the pressed sheets are obtained with uneven thickness due to large deviations in tolerance of the conveying plates. Great losses in heat are encountered when hot pressing is applied due to the conveying plates being heated for each working cycle and then becoming cooled on return to the press and the new charge. Deviations in tolerance have been particularly prominent when producing, e.g., fiber boards in the press.
  • the wet, cold sheet blank is fed on a cold conveying plate between the press plates of the hot press, the press plates working at a temperature of between 200 and 250 C. and a specific compression pressure on the introduced fiber blank of an order of magnitude between 50 and 100 kgs./cm.
  • wire cloth feeding system is not encumbered with corresponding large thickness tolerances of the final product.
  • wire cloth feeding systems known hitherto have either low capacity and large wear and tear, or require too complicated feed and discharge means, resulting in the plate feeding system, despite its obvious drawbacks, being used to an overwhelming degree.
  • Another object of the invention is to provide a feeding device reducing the heat the requirements of mechanical strength of the conveying means on which the blanks are introduced between the press plates and the pressed articles removed from the press.
  • a further object of the invention is to provide a feeding device which permits to retain the conveying means of the plate feeding system are retained in their entirety, i.e., with respect to loading racks, pushing means, discharge racks withdrawal means and return conveyors with supporting and loading means for the material.
  • FIG. 1 is a plan view of a conveyor means designed according to the invention.
  • FIG. 2 is a partial side view of a multipress together with a side view of a transport means entered into said press, with portions cut away in vertical section.
  • FIG. 3 is a sectional view along the line III--III of FIG. 2.
  • FIG. 4 shows a similar section as that in FIG. 3 according to a somewhat modified form of the invention.
  • the conveying means is provided with a rectangular elongated frame, generally indicated by the reference numeral 10, in which a wire cloth piece 12 is held stretched.
  • the frame 10 is composed of two frame pieces 14 forming the two long sides of the same, said frame pieces M being securely connected at the ends with shorter crosspieces 16, 18
  • the frame pieces 14 can be constituted of flattened tubing, as is particularly evident from FIG. 3 and l, whereas the crosspieces l6, 13 have enlarged cross-sectional dimensions and are possibly composed of two or more portions.
  • Strip formed elements 20 which fit the inner cross section of the tube 14 and which are inserted in said tube are rigidly connected to the lower face of the crosspieces.
  • the wire cloth piece 112 is secured in the frame 10 at the short sides only, for which purpose the striplike crosspieces 16, 118 can be provided with transversal slots 22.
  • the end portion of the wire cloth piece 12 is passed through said slots in the form of a loop 24 into which is inserted a rod 26 which locks the loop so that it cannot leave the slots 22.
  • the long sides of the rectangular wire cloth piece 12 are suitably free in relation to the frame pieces 14.
  • the wire cloth piece is stretched to the required degree by means of the crosspieces l6, 18 before their telescoped striplike elements 20 are fastened in the tube M.
  • a setscrew Ma may be used to hold the elements 20 in the required cloth-stretching position as shown in FIG. 2.
  • the upper plate supports a so-called polishing plate or press plate 32 by means of retainer members 33 to 36.
  • a wire cloth piece 38 can be positioned, in a manner known per se, between said polishing plate and the upper press plate 30.
  • the lower press plate 28 is provided at both its long edges with chamfers 40 which fit the frame pieces M.
  • the crosspieces l6 and 18 are located outside the press in the working position of the conveying means between the press plates. This involves that the frame 10 in its entirety is located outside the surface 42 in the lower press plate 28 against which pressing of the blank 44 is effected. Consequently, the frame is only heated to a low degree by the press plate.
  • the lower press plate 28 is provided with brackets 46 in the form of an angle irons of which one is retained at each longitudinal side end wall of the press plate by means of screws 48.
  • brackets 46 in the form of an angle irons of which one is retained at each longitudinal side end wall of the press plate by means of screws 48.
  • the wire cloth piece 12 can be replaced by a thin foraminous carrier metal sheet.
  • a thin foraminous carrier metal sheet is so thin as to be pliable or flexible and thus lacking inherent rigidity.
  • the conveying means resting on a support is passed between the separated press plates 28, 30 after the fiber blank has been placed on the layer 12 by subjecting the crosspiece 16 to a force acting in the direction of the arrow 50, by means of a suitable traction means (not shown). Subsequent to the pressing operation the conveying means is withdrawn by applying a traction force to the crosspiece 18 in the direction of the arrow 52.
  • the frame only requires sufficient rigidity to retain the layer 12, with the sheet of wet fiber pulp mounted thereon, stretched during insertion of the conveying means into the press.
  • the tube piece 14 of the long sides has thus sufficient buckling resistance to withstand the stresses occurring in conjunction therewith.
  • the frame need not necessarily be so strong that it can support the layer 12 together with the wet pulp blank positioned thereon if the frame, e.g., is supported on its short crosspieces l6, 18.
  • the conveying means may thereby be given a relatively low weight.
  • a feeding device for use in multipresses for producing boards or sheets of fibrous vegetable material comprising, a plurality of superimposed press sheets between which the sheet or board blank is fed on flexible metallic sheets and sub- 5 jected to pressure and heat between the plates, each of the metallic sheets being carried in and stretched on a frame, the metallic sheets in the frames being each connected to the frame only at opposite ends of the frame and being free of connection to the frame at its side edges, one of the ends of the frame being adjustable toward or away from the opposite end thereof to effect stretching action of the metallic sheet, the frame being of greater size than the size of the effective pressure surfaces of the press plates so that when one of the frames and its metallic sheet are disposed in pressing position, the frame will be disposed beyond the pressing surfaces and hence will receive no pressure therefrom and a minimum of heat.
  • a lower pressing plate has a depressed area adjacent to its periphery and beyond its pressing surface, such depressed area providing a supporting shelf for parts of the frame so that such frame parts are not subjected to pressure from the press plates.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Paper (AREA)
US559854A 1966-02-10 1966-06-23 Feeding device for sheet and planular blanks in multilayer presses Expired - Lifetime US3635643A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1720/66A SE324698B (en, 2012) 1966-02-10 1966-02-10

Publications (1)

Publication Number Publication Date
US3635643A true US3635643A (en) 1972-01-18

Family

ID=20258708

Family Applications (1)

Application Number Title Priority Date Filing Date
US559854A Expired - Lifetime US3635643A (en) 1966-02-10 1966-06-23 Feeding device for sheet and planular blanks in multilayer presses

Country Status (4)

Country Link
US (1) US3635643A (en, 2012)
DE (1) DE1653175B1 (en, 2012)
NO (1) NO119392B (en, 2012)
SE (1) SE324698B (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230141881A1 (en) * 2021-11-11 2023-05-11 National Yang Ming Chiao Tung University Fixture for heat pressing process of manufacturing airbag

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1005706A (en) * 1910-07-11 1911-10-10 Franz Hloch Apparatus for making asbestos-cement slabs and the like.
US1587462A (en) * 1919-11-04 1926-06-01 Barrett Co Process and apparatus for crimping plastic material
US1908699A (en) * 1930-10-20 1933-05-16 Insulite Co Means for feeding articles to and withdrawing them from a press
US2946091A (en) * 1954-07-02 1960-07-26 American Brake Shoe Co Presses for thermosetting compositions
US3025566A (en) * 1959-02-06 1962-03-20 Kostur J Edward Automatic vacuum forming machine for plastics
GB933354A (en) * 1960-12-24 1963-08-08 Herbert Van Huellen Improvements in or relating to the manufacture of chip-board or the like
US3167816A (en) * 1961-11-30 1965-02-02 Internat Fabric Molders Inc Apparatus for making brassieres and other garments
US3286304A (en) * 1963-03-19 1966-11-22 Defibrator Ab Device in multilayer presses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1198543B (de) * 1962-10-16 1965-08-12 Eugen Siempelkamp Etagenpresse mit Beschicksieben fuer die Herstellung von Spanplatten, Faserplatten od. dgl.
DE1204403B (de) * 1963-03-19 1965-11-04 Eugen Siempelkamp Etagenpresse mit Beschicksieben fuer die Herstellung von Spanplatten, Faserplatten od. dgl.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1005706A (en) * 1910-07-11 1911-10-10 Franz Hloch Apparatus for making asbestos-cement slabs and the like.
US1587462A (en) * 1919-11-04 1926-06-01 Barrett Co Process and apparatus for crimping plastic material
US1908699A (en) * 1930-10-20 1933-05-16 Insulite Co Means for feeding articles to and withdrawing them from a press
US2946091A (en) * 1954-07-02 1960-07-26 American Brake Shoe Co Presses for thermosetting compositions
US3025566A (en) * 1959-02-06 1962-03-20 Kostur J Edward Automatic vacuum forming machine for plastics
GB933354A (en) * 1960-12-24 1963-08-08 Herbert Van Huellen Improvements in or relating to the manufacture of chip-board or the like
US3167816A (en) * 1961-11-30 1965-02-02 Internat Fabric Molders Inc Apparatus for making brassieres and other garments
US3286304A (en) * 1963-03-19 1966-11-22 Defibrator Ab Device in multilayer presses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230141881A1 (en) * 2021-11-11 2023-05-11 National Yang Ming Chiao Tung University Fixture for heat pressing process of manufacturing airbag
US12017417B2 (en) * 2021-11-11 2024-06-25 National Yang Ming Chiao Tung University Fixture for heat pressing process of manufacturing airbag

Also Published As

Publication number Publication date
DE1653175B1 (de) 1970-07-09
SE324698B (en, 2012) 1970-06-08
NO119392B (en, 2012) 1970-05-11

Similar Documents

Publication Publication Date Title
US2779969A (en) Apparatus for the continuous manufacture of compressed boards and sheets
IT9021943A1 (it) Procedimento e dispositivo per riscaldare una pressa a piastra di riscaldamento operante in continuo
US3635643A (en) Feeding device for sheet and planular blanks in multilayer presses
US3173976A (en) Method and device for the formation and transport of blanks, formed of particles such as wood shavings, fibres and the like destined to be compressed to boards
DE2228244B2 (de) Vorrichtung zum beschicken und entleeren einer mehretagenpresse
DE2248181C3 (de) Verfahren und Vorrichtung zum Verkleben flächenförmiger Textilstücke
US2642782A (en) Fiberboard forming press with loader and unloader
US3378884A (en) Apparatus for making fiber reinforced resin articles especially in sheet form
CN207592524U (zh) 一种五金配件用连续冲压装置
CN210031194U (zh) 一种防皱边的纺织面料加工装置
US3728799A (en) Apparatus for producing thermoplastic sheet articles
CN209737827U (zh) 一种新型自动保压拼板机
US3284917A (en) Warpage control in molded pulp articles
CN220597884U (zh) 一种袜子定型机的定位板
CN210684320U (zh) 一种带3d压花装置的吸水纸生产线
CN103009452A (zh) 薄型中密度重组竹板材的制造方法
CN214649226U (zh) 一种覆膜机的自动包角装置
KR20180113759A (ko) 연속 복합섬유를 이용한 중공 파이프 성형장치
US3259535A (en) Method and apparatus for treating mats of a loose fibrous or filamentary structure
DE1909158A1 (de) Verfahren zur Herstellung von Pappe aus wiederaufbereitetem papp- und thermoplastischem Material
US3690801A (en) Discharge device for platen press
US4412801A (en) Pressed-board plant with multilevel press
US2437254A (en) Drum drier for sheet material
CN219908153U (zh) 一种烫平机
CN221142228U (zh) 一种面料纺织自动上料装置