EP0208920A1 - Vorrichtung zum Brennen von keramischen Materialien, insbesondere für glasierte Kacheln - Google Patents

Vorrichtung zum Brennen von keramischen Materialien, insbesondere für glasierte Kacheln Download PDF

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Publication number
EP0208920A1
EP0208920A1 EP86108077A EP86108077A EP0208920A1 EP 0208920 A1 EP0208920 A1 EP 0208920A1 EP 86108077 A EP86108077 A EP 86108077A EP 86108077 A EP86108077 A EP 86108077A EP 0208920 A1 EP0208920 A1 EP 0208920A1
Authority
EP
European Patent Office
Prior art keywords
reliefs
channel
crown
firing
distance
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.)
Withdrawn
Application number
EP86108077A
Other languages
English (en)
French (fr)
Inventor
Renato Bossetti
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.)
Impianti Termoelettrici Industriali SpA Siti Soc
Original Assignee
Impianti Termoelettrici Industriali SpA Siti Soc
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 Impianti Termoelettrici Industriali SpA Siti Soc filed Critical Impianti Termoelettrici Industriali SpA Siti Soc
Publication of EP0208920A1 publication Critical patent/EP0208920A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/007—Partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • F27B2009/3027—Use of registers, partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F27B2009/3638—Heaters located above and under the track
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F27B2009/3646—Heating the ceiling or the walls for a reverberatory effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/32—Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used

Definitions

  • This invention relates to an apparatus for firing ceramic materials particularly useful for firing tiles and especially glazed tiles.
  • Glazed tiles are tiles which have been subjected to a firing treatment at a temperature higher than 1100°C.
  • glazed tiles are fired in roller furnaces heated by a plurality of burners.
  • the tiles are transported through the furnace by plural independently rotating rollers.
  • This type of roller furnace while affording high production rates, has a typical disadvantage of some importance: some of the tiles are distorted by the firing process. The distortion typically turns a square or rectangular raw tile into a fired tile of trapezoidal shape.
  • a trapezoidal tile cannot be laid even though its distortion may be relatively smalls because during installation, in particular with the Italian layout method, the fault of any tile would add to the fault of a successive tile yielding an end fault which is quite showy and unattractive.
  • Italian patent application No. 28352 A/77 filed by Welko Industriale S.p.A. on October 7, 1977 discloses a channel type furnace which has a plurality of muffle-chambers laid serially along the path for the ceramic material. According to said Welko application, connection between each chamber and the next is accomplished through pairs of upper and lower transverse walls which form bottle necked portions which force the hot gas stream to sweep as close as possible to the materials to be fixed.
  • Such bottle necked portions are adjustable according to said patent application to accomodate different sizes of the ceramic material, such that the upper wall can be lowered to skim the moving ceramic material.
  • a further object of this invention is to reduce rejects and in the extreme, to avoid the need itself for the above-described sorting apparatus placed at the furnace outlet.
  • a not least object of this invention is to allow utilization of the whole inner space of the channel as a firing zone, thus decreasing the channel dimensions and increasing thermal output correspondingly.
  • an apparatus for firing ceramic materials comprising:
  • the curve pattern is indicative of the cross-distribution of temperatures.
  • that curve is optimal if in the section 2-3 the maximum temperature variation, from the set average, is less than 2-3°C and if over the sections 1-2,3-4 the maximum temperature variation, from the set average, is less than 5-6°C (0.5% of the furnace temperature).
  • the sections 1-2,3-4 have a length of about 5-10 cm.
  • the ceramic material firing apparatus comprises a channel 10 heated by a plurality of burners 11 arranged in the proximity of the crown 12 and by a plurality of burners 13 arranged in the proximity of the sole 30.
  • the apparatus comprises a plurality of rollers 14 which convey the tiles 20 in a longitudinal direction along the channel.
  • the crown 12 has a plurality of reliefs 16 according to the invention extending transversely to the direction of advance of the tiles.
  • Each reliefs 16 extends downwards from the crown 12 of the channel to the base 18 of the reliefs 16.
  • that extension when measured vertically, exceeds 1/6 and even more preferably exceeds 1/4 the distance from the crown 12 to the bearing plane of the tiles 20 on the rollers 14.
  • the reliefs 16 have coupling means consisting, for example, of the detent ribs 22, adapted to engage with the supporting structures 23 of the crown of the channel 10.
  • the reliefs 40 form a unitary construction with the supporting beams of the crown 12 of the channel and, accordingly, they form supporting beams by themselves.
  • the apparatus according to this invention affords glazed tiles which are free of distortions in excess of 0.2% with respect to the standard preset form, practically without rejects, thus conclusively solving both the installation and thermal efficency problems.
  • This invention allows in fact the whole surface of the transport plane defined by the rollers to be utilized without leaving dead spaces, thereby reducing the volumes and increasing the output.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
EP86108077A 1985-07-02 1986-06-13 Vorrichtung zum Brennen von keramischen Materialien, insbesondere für glasierte Kacheln Withdrawn EP0208920A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2139885 1985-07-02
IT21398/85A IT1185164B (it) 1985-07-02 1985-07-02 Apparato per la cottura di materiali ceramici particolarmente adatto per la cottura di piastrelle greficate

Publications (1)

Publication Number Publication Date
EP0208920A1 true EP0208920A1 (de) 1987-01-21

Family

ID=11181169

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108077A Withdrawn EP0208920A1 (de) 1985-07-02 1986-06-13 Vorrichtung zum Brennen von keramischen Materialien, insbesondere für glasierte Kacheln

Country Status (6)

Country Link
EP (1) EP0208920A1 (de)
JP (1) JPS6210588A (de)
BR (1) BR8602970A (de)
ES (1) ES8705105A1 (de)
IT (1) IT1185164B (de)
YU (1) YU44581B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0576934B1 (de) * 1992-06-23 1998-09-16 TDK Corporation Kalzinierungsofen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR596680A (fr) * 1925-03-25 1925-10-29 Ac Spark Plug Co Procédé et appareil pour la cuisson des objets en céramique
US3328861A (en) * 1965-06-24 1967-07-04 Pullman Inc Roller hearth tunnel kilns
EP0046993A1 (de) * 1980-08-28 1982-03-10 Buchtal GmbH Keramische Betriebe Verfahren zur Verhinderung der Reoxidation des Brenngutes in der Kühlzone für einen Rollenofen
DE3338078C1 (de) * 1983-10-20 1985-03-21 Adolf A. Fleischmann Inh. Werner Fleischmann, 6000 Frankfurt Trennwehr für Kühlerkanal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR596680A (fr) * 1925-03-25 1925-10-29 Ac Spark Plug Co Procédé et appareil pour la cuisson des objets en céramique
US3328861A (en) * 1965-06-24 1967-07-04 Pullman Inc Roller hearth tunnel kilns
EP0046993A1 (de) * 1980-08-28 1982-03-10 Buchtal GmbH Keramische Betriebe Verfahren zur Verhinderung der Reoxidation des Brenngutes in der Kühlzone für einen Rollenofen
DE3338078C1 (de) * 1983-10-20 1985-03-21 Adolf A. Fleischmann Inh. Werner Fleischmann, 6000 Frankfurt Trennwehr für Kühlerkanal

Also Published As

Publication number Publication date
YU44581B (en) 1990-10-31
ES8705105A1 (es) 1987-04-16
IT1185164B (it) 1987-11-04
IT8521398A0 (it) 1985-07-02
BR8602970A (pt) 1987-02-17
JPS6210588A (ja) 1987-01-19
ES556343A0 (es) 1987-04-16
YU114386A (en) 1988-10-31

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Inventor name: BOSSETTI, RENATO