EP0144881B1 - Verfahren zum Verdichten von gewellten Faserzementplatten - Google Patents

Verfahren zum Verdichten von gewellten Faserzementplatten Download PDF

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Publication number
EP0144881B1
EP0144881B1 EP84114222A EP84114222A EP0144881B1 EP 0144881 B1 EP0144881 B1 EP 0144881B1 EP 84114222 A EP84114222 A EP 84114222A EP 84114222 A EP84114222 A EP 84114222A EP 0144881 B1 EP0144881 B1 EP 0144881B1
Authority
EP
European Patent Office
Prior art keywords
grooves
filtrate
air
channels
channel system
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
Application number
EP84114222A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0144881A2 (de
EP0144881A3 (en
Inventor
Silvio Sutter
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.)
Bell Maschinenfabrik AG
Original Assignee
Bell Maschinenfabrik AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4312080&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0144881(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bell Maschinenfabrik AG filed Critical Bell Maschinenfabrik AG
Priority to AT84114222T priority Critical patent/ATE32041T1/de
Publication of EP0144881A2 publication Critical patent/EP0144881A2/de
Publication of EP0144881A3 publication Critical patent/EP0144881A3/de
Application granted granted Critical
Publication of EP0144881B1 publication Critical patent/EP0144881B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/528—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement for producing corrugated sheets
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/46—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for humidifying or dehumidifying

Definitions

  • the invention relates to a method for compacting moist, corrugated fiber cement boards, which lie on a press-resistant, permeable press base and are pressed therewith between an upper and a lower mold for compacting the fiber cement mass, the pressed-out aqueous filtrate via a provided on the lower mold , to the permeable press pad open channel system is discharged, wherein the channel system can be flowed through with an air stream from an air pressure source in the direction of the filtrate discharge to a suction point, which entrains the drops of the aqueous filtrate which have leaked through the press pad during the compression. accelerated and transported.
  • the compression improves the quality of the product: the strength values are increased and the weather resistance is improved.
  • the preformed fiber cement board becomes 10 to 25% thinner.
  • the press pad is a corrugated perforated sheet corresponding to the wave form of the fiber cement board, the surface of which is provided with a sieve fabric layer which bridges the holes in the sheet.
  • the surface of the lower mold has waves that correspond exactly to those on the lower side of the press base.
  • the pressing surface of the upper die has corrugations which correspond to the corrugated shape of the upper side of the compressed fiber cement board.
  • the fiber cement board is compressed using a pressure of 50 to 200 kp / cm 2 (5 to 20 MPa), which is achieved within 2 to 10 seconds and maintained for 1 to 20 seconds.
  • a pressure of 50 to 200 kp / cm 2 5 to 20 MPa
  • an aqueous filtrate flows out of the fiber cement mass through the screen mesh and the holes in the press base and is discharged through a channel system on the lower press mold.
  • the molds are moved apart and the press base with the compressed fiber cement board is moved out of the press, then unloaded, and another press base, which has meanwhile been loaded with another fiber cement board to be compressed, is moved into the press.
  • the unloaded press pad returns to be loaded in one cycle with a new fiber cement board to be compacted.
  • a number of press documents circulate in a circuit.
  • the homogeneity of the fiber cement board which is to be achieved by compacting, requires an even pressing, using a high pressing pressure, and a uniform dewatering of the mass.
  • the aqueous filtrate to be pressed out of the mass must also be removed from the mass evenly and quickly.
  • GB-A-1 535 356 shows a suction of a filtrate when producing cardboard sheets upwards through an upper press plate. The removal of the filtrate can be supported by blowing an air stream into the collecting spaces of the filtrate. However, this filtrate has no crust-forming components.
  • this object is achieved by the features specified in claim 1. This makes it possible to evenly, quickly and completely remove the amount of fil squeezed out occurs through a suitable channel system, the paths of which do not impair the strength of either the lower mold or the press base. If the air flow is of sufficient speed, there are no bottlenecks caused by incrustations that prevent the filtrate from being removed, because the walls of the paths remain unwetted or dry.
  • a fiber cement plate 3 is compacted in a space 4 between a lower mold 1 and an upper mold 2.
  • the molds are installed in a press of known construction, which is not shown in the drawing, and are vertically relative to one another, also known here means not shown movable.
  • a moist, preformed to be compacted, i.e. H. corrugated fiber cement plate 3 lies in a space 4 between the two molds 1 and 2 on a permeable, press-resistant press base 5. This is made of a perforated plate with holes 6.
  • the press pad 5 lies on the surface of the lower die 1 which has corrugations, the corrugation of the press die 1 and the corrugation of the adjacent side of the press pad 5 being matched to one another, so that the press pad 5 can lie tightly on the surface of the press die 1.
  • the surface of the press pad 5 is provided with a fine-mesh screen fabric 7, which bridges the holes 6 of the press pad 5.
  • a separating layer 8 is provided between the fiber cement plate 3 and the corrugated structure of the upper mold 2. which prevents the fiber cement plate from sticking to the upper mold 2.
  • the surface pressure In order to achieve a desired compression effect, the surface pressure must be generated in the range of 50 to 200 kp / cm 2 (5 to 20 MPa). After the desired maximum surface pressure in a time of z. B. 2-10 seconds is reached, the corresponding pressing force is still for a few seconds, for. B. 1 to 20 seconds. The molds 1 and 2 are then moved apart and the compacted fiber cement plate with the press pad is moved out of the space between the press molds.
  • the channel system adjoining the holes 6 of the press base 5 for discharging the pressed filtrate has upwardly open grooves or grooves 9 on the corrugated surface of the lower press mold 1 with respect to the holes 6. These run over the width of the mold 1 in accordance with the fall lines in each case from a wave trough 10 over the wave crest 11 into the next wave trough 10 and are arranged closely next to one another along the length of the mold 1, as can be seen in FIG. 1 in a transverse view and in FIG 2 is shown particularly clearly in longitudinal section.
  • the division or distribution of the grooves 9 on the press mold 1 and the division or distribution of the holes 6 through the press base 5 are selected such that a sufficient plurality of holes lies above the grooves 9 and only a minority of these lies above the webs 12 the grooves.
  • a vertical bore 13 is provided in each trough 10 of each groove 9, which leads into collecting channels 14, which run under the troughs 10 through the press mold according to the length of the press mold.
  • a sufficient air flow speed in the grooves 9 is in the range of 15 to 20 m / sec. This is sufficient for the droplets of the pressed-out filtrate to be entrained by the air stream flowing through, accelerated, broken up into particles or atomized and transported at this speed through the grooves 9 and the bores 13 into the collecting channels 14 without the walls of these being relatively narrow To wet flow profiles.
  • the maintenance of the pressing pressure in the final phase of the pressing must correspond to the time required to remove the filtrate from the grooves. This will be accomplished in a few seconds.
  • all collecting channels 14 running through the press mold in the longitudinal direction below the wave troughs 10 are connected to a suction line 17 (on the right in the picture) on an end face of the lower press mold 1, which is connected via a separator 18 to separate the filtrate leads from the air to the suction side of a fan 19.
  • the front side of the fan 19 is connected via a pressure line 20 (left in the picture) to all air distribution channels 15, which each run through the press mold in the longitudinal direction under the wave crests 11.
  • the channels 15 are covered on the opposite end face of the mold 1.
  • the channels 14 on the end face of the mold 1 opposite the suction line 17 are also covered.
  • the air flows from an air pressure source, the fan 19, into the air distribution channels 15, from there through the bores 16 to the wave crests 11, through the grooves 9, where the drops of the filtrate are carried along, accelerated, atomized, and this air filtrate.
  • Mixture flows through the bores 13 into the collecting channels 14 and into the separator 18. After separation from the filtrate in the separator 18, the air is again conveyed via the fan 19 into the air distribution channels 14 and so on in the circuit described.
  • the width of the grooves 9 and the width of the webs 12 provided between the grooves 9 must be selected so that the material of the press base 5 bridging the grooves 9 and the webs 12 does not press into the grooves 9 under the normal high operating pressure is driven in, although it must have a lower strength than the material of the mold 1.
  • the edges of the webs 12 are left sharp, i. H. they must not be rounded off so that the material of the press base 5 is not bent on the webs 12 under the pressure.
  • the grooves 9, like the webs 12, can be only a few millimeters and both approximately the same width.
  • the perforation of the press base 5 can also be selected with the same density, the holes 6 being at the tips of an imaginary isosceles triangle with a side of a few millimeters to one another. If a hard foreign body occurs in the fiber cement mass, with a certain thickness of the foreign body in relation to the thickness of the fiber cement board to be compacted, the pressing pressure can increase locally so high that the material of the pressing base 5, the tightly perforated sheet metal, no longer withstands and locally in one or a few Grooves penetrate. The mold or the grooves 9 or the webs 12 remain intact. The locally damaged press pad is discarded from the process and replaced with a reserve. The damaged press pad can be easily repaired by reinserting and welding in an appropriate piece of perforated sheet.
  • the cross section of the respective longitudinal channel 14 or 15 corresponds approximately to the sum of the cross sections of the grooves 9 located above it and connected to it by bores 13 and 16, respectively, which are bridged with the press base 5, so that they form channels in this way.
  • the above-mentioned flow rate of about 15 to 20 m / sec prevails.
  • the speed in the connecting bores 13 and 16 is approximately twice as high.
  • the drops of the filtrate flowing freely through the press base 5, or even under suction, into the channel-like grooves 9 are immediately entrained and carried away. This is done by atomizing the drops with a volume excess air to the volume of the filtrate to be removed. With this excess air, there is no wetting of the walls of the filtrate discharge paths, so that no incrustations form that narrow the paths.
  • the trails are kept dry so that it is after Switching off the pressing pressure to prevent the filtrate, once pressed out, from being sucked back into the compressed fiber cement board. Uniform dehumidification of the entire surface of the fiber cement board is achieved.
  • the lower mold 1 can be divided into a number of longitudinal sections. Such a dividing line is designated by 21 in FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Laminated Bodies (AREA)
  • Artificial Filaments (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Paper (AREA)
  • Catalysts (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
EP84114222A 1983-12-09 1984-11-24 Verfahren zum Verdichten von gewellten Faserzementplatten Expired EP0144881B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114222T ATE32041T1 (de) 1983-12-09 1984-11-24 Verfahren zum verdichten von gewellten faserzementplatten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6596/83 1983-12-09
CH6596/83A CH661470A5 (de) 1983-12-09 1983-12-09 Verfahren zum verdichten von gewellten faserzementplatten.

Publications (3)

Publication Number Publication Date
EP0144881A2 EP0144881A2 (de) 1985-06-19
EP0144881A3 EP0144881A3 (en) 1985-07-17
EP0144881B1 true EP0144881B1 (de) 1988-01-20

Family

ID=4312080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114222A Expired EP0144881B1 (de) 1983-12-09 1984-11-24 Verfahren zum Verdichten von gewellten Faserzementplatten

Country Status (13)

Country Link
EP (1) EP0144881B1 (fi)
JP (1) JPS60139405A (fi)
AT (1) ATE32041T1 (fi)
AU (1) AU567379B2 (fi)
BR (1) BR8406032A (fi)
CH (1) CH661470A5 (fi)
DE (1) DE3468832D1 (fi)
DK (1) DK160684C (fi)
ES (1) ES8604805A1 (fi)
FI (1) FI76952C (fi)
IE (1) IE56098B1 (fi)
MX (1) MX162222A (fi)
MY (1) MY101046A (fi)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE830168C (de) * 1939-06-27 1952-01-31 Pino Salvaneschi Verfahren und Vorrichtung zum Herstellen von profilierten Teilen aus Zementmischung o. dgl.
DE1459311A1 (de) * 1961-07-15 1969-03-27 Giuseppe Gremigni Verfahren und Vorrichtung zum Formen und Verdichten von Platten aus formbarem Werkstoff,insbesondere aus Asbestzement
BE790805A (nl) * 1971-12-10 1973-02-15 Eternit Nv Inrichting voor het vervaardigen van vormlichamen uit vezelstof
GB1535356A (en) * 1977-02-04 1978-12-13 Green Son & Waite Ltd W Presses for compressing liquid containing material into block form
DE2832094C3 (de) * 1978-07-21 1981-02-19 G. Siempelkamp Gmbh & Co, 4150 Krefeld Mit einer wellenförmigen Preßfläche ausgebildete Preßvorrichtung innerhalb einer Anlage zum Herstellen von gewellten Asbestzementplatten

Also Published As

Publication number Publication date
DK160684C (da) 1991-09-30
BR8406032A (pt) 1985-08-27
IE842973L (en) 1985-06-09
EP0144881A2 (de) 1985-06-19
FI76952B (fi) 1988-09-30
ATE32041T1 (de) 1988-02-15
MY101046A (en) 1991-07-16
ES538397A0 (es) 1986-03-01
JPH0321323B2 (fi) 1991-03-22
MX162222A (es) 1991-04-01
DE3468832D1 (en) 1988-02-25
FI76952C (fi) 1989-01-10
ES8604805A1 (es) 1986-03-01
EP0144881A3 (en) 1985-07-17
AU3643184A (en) 1985-06-13
IE56098B1 (en) 1991-04-10
DK585884A (da) 1985-06-10
FI844536L (fi) 1985-06-10
JPS60139405A (ja) 1985-07-24
DK585884D0 (da) 1984-12-07
CH661470A5 (de) 1987-07-31
FI844536A0 (fi) 1984-11-19
AU567379B2 (en) 1987-11-19
DK160684B (da) 1991-04-08

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