EP1674228B1 - System for compacting ceramic powders for forming slabs using a belt - Google Patents
System for compacting ceramic powders for forming slabs using a belt Download PDFInfo
- Publication number
- EP1674228B1 EP1674228B1 EP05077714.3A EP05077714A EP1674228B1 EP 1674228 B1 EP1674228 B1 EP 1674228B1 EP 05077714 A EP05077714 A EP 05077714A EP 1674228 B1 EP1674228 B1 EP 1674228B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- belt
- compacting
- powders
- strip
- inclination
- 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.)
- Active
Links
- 239000000843 powder Substances 0.000 title claims description 52
- 239000000919 ceramic Substances 0.000 title claims description 15
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 230000002269 spontaneous effect Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping
- B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
- B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
- B28B5/027—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of the indefinite length type, e.g. belts, and being continuously fed
-
- 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
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/12—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material
- B28B3/123—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material on material in moulds or on moulding surfaces moving continuously underneath or between the rollers, e.g. on an endless belt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
- B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
- B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
Definitions
- the present invention refers to a system for compacting ceramic powders for forming slabs using a belt.
- the dry forming process of ceramic powders on a belt foresees the use of compacting belts, bottom and top respectively, cooperating to dry compact a strip of ceramic powders that is made to advance, through a conveyor belt arranged between them, in an advancing direction parallel to the bottom belt.
- the compacting is assisted by two compacting rollers kept pressed against the strip of ceramic powders.
- the top belt has a first receiving portion inclined with respect to the advancing direction of the powders and a second expansion portion respectively upstream and downstream of the compacting rollers present in the compacting area.
- the inclination of the first portion of the top belt, with respect to the advancing direction of the strip of powders, ensures a progressive squashing of the powders and allows the air present inside them to be expelled.
- EP 1226927-A2 discloses a system for compacting ceramic powders according to the preamble of claim 1.
- the phenomenon is more noticeable when strips of ceramic powders of a thickness greater than 30 mm are processed.
- a further drawback of known systems derives from the fact that the receiving portion of the top belt, due to the rather small inclination, less than 2°, implies an elongation of the receiving portion of the powder that is increasingly great the greater the thickness of the powder.
- the continuous compacting has a use limited to small thicknesses of powder with low degrees of compacting (reduction in thickness no greater than 30%).
- the purpose of the present invention is that of providing a system for compacting ceramic powders for forming slabs using a belt that ensures the complete expulsion of air, during compacting, also for high thicknesses of powders and degrees of compacting.
- a further purpose is that of providing a system that has a limited size, bulk and costs compared to those of the
- Such purposes are accomplished through a system for compacting ceramic powders for forming slabs using a belt in accordance with claim 1.
- a system for compacting ceramic powders for forming slabs using a belt in accordance with the present invention is globally indicated with 1.
- the system 1 comprising a conveyor belt 40 on which a continuous strip "S" of powdered ceramic material is created, a first bottom compacting belt 20 arranged in contact with the conveyor belt 40 and a second top compacting belt 30 cooperating with the first belt 20 to dry compact the strip S of powders and obtain a coherent article of compacted powders.
- the top belt 30 has a first housing portion 30a, arranged on the left in the figure, and a second expansion portion 30b, arranged on the right in the figure.
- the lateral containment of the powders is, as usual, carried out by two deformable side walls provided by the belts 60.
- the receiving portion 30a of the top belt 30 has an inclination " ⁇ " with respect to the direction in which the powders advance of between 2° and 14°, preferably between 3° and 10°.
- each belt 20, 30 is wound on a pair of rollers, one of which is a drive roller, respectively indicated with 32 for the top belt 30 and with 22 for the bottom belt 20, and the other is an idler roller, respectively indicated with 31 for the top belt 30 and with 21 for the bottom belt 20.
- rollers 31, 32 and 21, 22 of each pair are arranged a distance apart such as to keep the respective wound belts 30, 20 taut.
- the bottom belt 20 and the top belt 30 are equipped with a compacting roller, indicated with 33 for the top belt 30 and with 23 for the bottom belt 20.
- the two compacting rollers 33 and 23 act directly on the belts 30, 20 at the tangency points, indicated with 34 and 24 respectively for the top belt 30 and for the bottom belt 20.
- the distance between the two tangency points 34 and 24 is equal, apart from the thicknesses of the belts, to the minimum gap through which the strip S of powders is forced to pass.
- two rollers 36, 26 are arranged, formed from a plurality of idler rollers, which act on the respective belts 30, 20 upstream of the two compacting rollers 33, 23 and that have the function of keeping the belts 30 and 20 pressed to press the strip of powders S.
- the respective axes of the compacting rollers 33, 23 lie on a common plane perpendicular to the direction in which the strip S of powders advances.
- the minimum distance between the two belts 30, 20 and therefore the distance between the two compacting rollers 33 and 23 must be varied, i.e. the mutual position between the tangency points 34 and 24.
- top belt 30 is distanced from the bottom belt 20 through the displacement of the rollers 31, 32 on which it is wound.
- the inclination " ⁇ " of the first receiving portion 30a can also be varied, as desired between 2° and 14°, preferably between 3° and 10° with respect to the direction in which the strip S of powders advances.
- the point of first contact, indicated with 50, between the strip S of powders and the receiving portion 30a itself of the top belt 30 gets closer to the compacting rollers 33, 23, whereas they move away as the thickness of the strip S increases.
- the choice of the most suitable inclination P to be assigned to the receiving portion 30a to effectively remove the air incorporated in the powders to be compacted is carried out taking into account the specific properties of the powders to be treated.
- the length A of the portion of strip S of powders involved at the instant of compacting must be between 2 and 28 times the thickness of the strip S.
- the length A is equal to that of the projection, on the conveyor belt 40, of the distance between the point of first contact 50 of the top belt 30 by the strip S of powders and the tangency point 34 of the compacting roller 33 with the top belt 30.
- the system for compacting ceramic powders for forming slabs using a belt according to the present invention allows the requirements to be satisfied and allows the drawbacks mentioned in the introductory part of the present description with reference to the prior art to be overcome.
Description
- The present invention refers to a system for compacting ceramic powders for forming slabs using a belt.
- As known, the dry forming process of ceramic powders on a belt foresees the use of compacting belts, bottom and top respectively, cooperating to dry compact a strip of ceramic powders that is made to advance, through a conveyor belt arranged between them, in an advancing direction parallel to the bottom belt.
- The compacting is assisted by two compacting rollers kept pressed against the strip of ceramic powders.
- The top belt has a first receiving portion inclined with respect to the advancing direction of the powders and a second expansion portion respectively upstream and downstream of the compacting rollers present in the compacting area.
- The inclination of the first portion of the top belt, with respect to the advancing direction of the strip of powders, ensures a progressive squashing of the powders and allows the air present inside them to be expelled.
- Such a compacting system is described in detail in European patent application
EP-A-1356909 to the same Applicant, to which we refer for a complete understanding thereof. -
EP 1226927-A2 discloses a system for compacting ceramic powders according to the preamble ofclaim 1. - Up to now it has been considered that such an inclination must be between 1° and 2°.
- However, as the thickness of powder to be pressed increases, it has been found that there is insufficient discharge of air during pressing.
- The absence of air in the formed article is necessary to avoid imperfections during the subsequent movement, decoration and firing.
- If air is present the articles tend to break up dividing into thin layers to the detriment of the required integrity of the end product.
- The phenomenon is more noticeable when strips of ceramic powders of a thickness greater than 30 mm are processed.
- A further drawback of known systems derives from the fact that the receiving portion of the top belt, due to the rather small inclination, less than 2°, implies an elongation of the receiving portion of the powder that is increasingly great the greater the thickness of the powder.
- Therefore, the continuous compacting has a use limited to small thicknesses of powder with low degrees of compacting (reduction in thickness no greater than 30%).
- The purpose of the present invention is that of providing a system for compacting ceramic powders for forming slabs using a belt that ensures the complete expulsion of air, during compacting, also for high thicknesses of powders and degrees of compacting.
- A further purpose is that of providing a system that has a limited size, bulk and costs compared to those of the
- Such purposes are accomplished through a system for compacting ceramic powders for forming slabs using a belt in accordance with
claim 1. - The dependent claims outline preferred and particularly advantageous embodiments of the system according to the invention.
- Further characteristics and advantages of the invention shall become clear from reading the following description provided as an example and not for limiting purposes, with the help of the figure illustrated in the attached table, which shows a schematic view of a system for compacting ceramic powders for forming slabs using a belt in accordance with the present invention.
- With reference to the aforementioned figure, a system for compacting ceramic powders for forming slabs using a belt in accordance with the present invention is globally indicated with 1.
- The
system 1 comprising aconveyor belt 40 on which a continuous strip "S" of powdered ceramic material is created, a firstbottom compacting belt 20 arranged in contact with theconveyor belt 40 and a secondtop compacting belt 30 cooperating with thefirst belt 20 to dry compact the strip S of powders and obtain a coherent article of compacted powders. - The
top belt 30 has afirst housing portion 30a, arranged on the left in the figure, and asecond expansion portion 30b, arranged on the right in the figure. - The lateral containment of the powders is, as usual, carried out by two deformable side walls provided by the
belts 60. - In accordance with the present invention, it has been seen that, in order to effectively expel the air incorporated in the strip S of powders it is essential that the length "A" of the portion of strip S of powders involved at the instant of compacting is as short as possible.
- According to the invention, the
receiving portion 30a of thetop belt 30 has an inclination "β" with respect to the direction in which the powders advance of between 2° and 14°, preferably between 3° and 10°. - In the example, each
belt top belt 30 and with 22 for thebottom belt 20, and the other is an idler roller, respectively indicated with 31 for thetop belt 30 and with 21 for thebottom belt 20. - The
rollers respective wound belts - In order to carry out the compacting action more effectively, the
bottom belt 20 and thetop belt 30 are equipped with a compacting roller, indicated with 33 for thetop belt 30 and with 23 for thebottom belt 20. - The two
compacting rollers belts top belt 30 and for thebottom belt 20. - Basically, the distance between the two
tangency points - Moreover, and as known in the field, between the pairs of
rollers rollers respective belts compacting rollers belts - In order to have correct compacting, the respective axes of the compacting
rollers - To vary the desired thickness of the end slab the minimum distance between the two
belts rollers tangency points - This can be carried out through moving means, known in the field and therefore not illustrated here, suitable for distancing and approaching the compacting
rollers - Of course, the
top belt 30 is distanced from thebottom belt 20 through the displacement of therollers - Downstream of the
compacting rollers expansion portion 30b of thetop belt 30 and the second acts on thebottom belt 20, to control the spontaneous expansion of the strip of compacted powders S. - Advantageously, in order to allow the compacting of strips S of powders having substantially different thicknesses, as well as suitably distancing the
belts respective compacting rollers portion 30a can also be varied, as desired between 2° and 14°, preferably between 3° and 10° with respect to the direction in which the strip S of powders advances. - This is possible, for example, through the use of suitable means, not illustrated, that allow the roller arranged at the inlet end of the strip S of powders, in the example the
idler roller 31, to be distanced and approached with respect to theconveyor belt 40 where the continuous strip S of ceramic powders is arranged. - As the inclination P assigned to the
receiving portion 30a varies, the point of first contact, indicated with 50, between the strip S of powders and thereceiving portion 30a itself of thetop belt 30 gets closer to thecompacting rollers - The choice of the most suitable inclination P to be assigned to the receiving
portion 30a to effectively remove the air incorporated in the powders to be compacted is carried out taking into account the specific properties of the powders to be treated. - In particular, their fluidity must be taken into account.
- Indeed, should the inclination P be excessive, the top portion of the strip S of powders would not be carried between the
belts - From the tests carried out it has been ascertained that in order to obtain a sufficient deaeration of the powder, the length A of the portion of strip S of powders involved at the instant of compacting must be between 2 and 28 times the thickness of the strip S.
- Where the length A is equal to that of the projection, on the
conveyor belt 40, of the distance between the point offirst contact 50 of thetop belt 30 by the strip S of powders and thetangency point 34 of thecompacting roller 33 with thetop belt 30. - As can be appreciated from what has been described, the system for compacting ceramic powders for forming slabs using a belt according to the present invention allows the requirements to be satisfied and allows the drawbacks mentioned in the introductory part of the present description with reference to the prior art to be overcome.
- Of course, a man skilled in the art can bring numerous modifications and variants to the system for compacting ceramic powders for forming slabs using a belt described above in order to satisfy contingent and specific requirements, all of which are covered by the scope of protection of the invention, as defined by the following claims.
Claims (5)
- System (1) suitable for compacting ceramic powders for forming slabs using a belt comprising:- a conveyor belt (40);- a continuous strip (S) of powdered ceramic material on the conveyor belt (40);- a first bottom compacting belt (20) arranged in contact with the conveyor belt (40) and below it;- a second top compacting belt (30) cooperating with said first belt (20) and having a first receiving portion (30a) having an inclination (β) with respect to the direction in which the powders (S) advance, and a second controlled expansion portion (30b),
wherein each belt (20, 30) is wound on a pair of rollers, one of which (22, 32) is a drive roller and the other (21, 31) is an idler roller,
wherein each belt (20, 30) is equipped with a compacting roller (23, 33) acting directly on the belt at a tangency point (24, 34),
wherein the distance between the two tangency point (24, 34) is equal, apart from the thickness of the belts, to a minimum gap through which the strip (S) of powders is forced to pass,
characterised in that, downstream of the compacting rollers (33, 23), the system comprises two opposite plates (35, 25), a first of which (35) acts on the expansion portion (30c) of the second top belt (30) and the second acts on the first bottom belt (20), to control the spontaneous expansion of the strip of compacted powders (S), and
in that the length (A) of the portion of powder (S) involved at the instant of compacting is between 2 and 28 times the thickness of the powders (S), said thickness being measured at the point of first contact (S) between the strip (S) of powders and the receiving portion (30a) of said top compacting belt (20)
and in that said inclination (β) of the first receiving portion (30a) is between 2° and 14°. - System (1) according to claim 1, comprising means for adjusting the inclination (β) suitable for varying the inclination (β) of the first receiving portion (30a).
- System (1) according to claim 1, wherein said top belt (30) and bottom belt (20) are mutually mobile apart and towards each other perpendicularly with respect to the direction in which the powders (S) advance.
- System (1) according to claim 1, wherein the respective rotation axes of said pair of compacting rollers (33, 23) lie on a common plane perpendicular to the direction in which the powders (S) advance, irrespective of the value of the length (A).
- System (1) according to claim 1, wherein said inclination (β) of the first receiving portion (30a) is between 3° and 10°.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL05077714T PL1674228T3 (en) | 2004-12-22 | 2005-12-01 | System for compacting ceramic powders for forming slabs using a belt |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000152A ITRE20040152A1 (en) | 2004-12-22 | 2004-12-22 | COMPACT SYSTEM WITH CERAMIC TAPES FOR SLAB FORMING |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1674228A2 EP1674228A2 (en) | 2006-06-28 |
EP1674228A3 EP1674228A3 (en) | 2006-10-25 |
EP1674228B1 true EP1674228B1 (en) | 2015-03-25 |
Family
ID=35871006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05077714.3A Active EP1674228B1 (en) | 2004-12-22 | 2005-12-01 | System for compacting ceramic powders for forming slabs using a belt |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1674228B1 (en) |
CN (1) | CN1792592B (en) |
ES (1) | ES2538492T3 (en) |
IT (1) | ITRE20040152A1 (en) |
PL (1) | PL1674228T3 (en) |
PT (1) | PT1674228E (en) |
RU (1) | RU2412049C2 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102744956A (en) * | 2012-06-28 | 2012-10-24 | 合肥通用机械研究院 | Nano-dry powder fully-closed continuous rolling plate making process |
ITUA20164307A1 (en) * | 2016-06-13 | 2017-12-13 | Sacmi | MACHINE AND METHOD FOR THE COMPACTION OF CERAMIC POWDER |
ITUA20164452A1 (en) * | 2016-06-16 | 2017-12-16 | System Spa | Compactor device for pressing ceramic products |
CN106079037A (en) * | 2016-07-29 | 2016-11-09 | 徐春雷 | A kind of it is compacted the solid loose material device and method with shaping slab |
CN106239702B (en) * | 2016-09-27 | 2020-04-14 | 广东科达洁能股份有限公司 | Continuous forming ceramic brick press and production process thereof |
IT201600105117A1 (en) * | 2016-10-19 | 2018-04-19 | Sacmi | MACHINE FOR THE COMPACTION OF MATERIAL POWDER |
IT201700075495A1 (en) * | 2017-07-05 | 2019-01-05 | Sacmi | METHOD AND PLANT FOR THE PRODUCTION OF CERAMIC PRODUCTS |
EP3852991B1 (en) * | 2018-09-21 | 2022-12-21 | Sacmi Cooperativa Meccanici Imola Societa' Cooperativa | Machine and method for compacting powder material |
CN109291218A (en) * | 2018-10-15 | 2019-02-01 | 广东科达洁能股份有限公司 | A kind of full-automatic lifting formula roll squeezer |
CN109227891A (en) * | 2018-10-24 | 2019-01-18 | 广东科达洁能股份有限公司 | A kind of rolling device producing the ceramic adobe with back line |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4325686A (en) * | 1980-11-28 | 1982-04-20 | Cabot Corporation | Apparatus for densifying powders of sub-micron particle size |
JPH04187706A (en) * | 1990-11-21 | 1992-07-06 | Nisshin Steel Co Ltd | Powder rolling mill |
DE4301594C2 (en) * | 1993-01-21 | 2002-10-31 | Dieffenbacher Gmbh Maschf | Process and plant for the production of chipboard |
IT1287473B1 (en) * | 1996-09-13 | 1998-08-06 | Emilceramica S P A | DEVICE FOR DECORATING CERAMIC TILES |
ITMI20010153A1 (en) * | 2001-01-29 | 2002-07-29 | Mauro Comastri S R L | LINEAR PRESSING POWDER COMPACTING MACHINE |
ITRE20010047A1 (en) * | 2001-05-08 | 2002-11-08 | Sacmi | PLANT FOR THE FORMING OF LARGE CERAMIC TILES, AND METHOD |
CN2505263Y (en) * | 2001-11-20 | 2002-08-14 | 山东鲁阳股份有限公司 | Ceramic fibre article squeezing press |
ITRE20020035A1 (en) * | 2002-04-24 | 2003-10-24 | Sacmi | METHOD AND PLANT FOR THE FORMING OF SLABS OR CERAMIC TILES |
CN2631726Y (en) * | 2003-01-16 | 2004-08-11 | 徐建 | Transfer apparatus of ceramic tile shaper |
-
2004
- 2004-12-22 IT IT000152A patent/ITRE20040152A1/en unknown
-
2005
- 2005-12-01 PL PL05077714T patent/PL1674228T3/en unknown
- 2005-12-01 EP EP05077714.3A patent/EP1674228B1/en active Active
- 2005-12-01 PT PT50777143T patent/PT1674228E/en unknown
- 2005-12-01 ES ES05077714.3T patent/ES2538492T3/en active Active
- 2005-12-14 CN CN2005101296314A patent/CN1792592B/en active Active
- 2005-12-14 RU RU2005138889/03A patent/RU2412049C2/en active IP Right Revival
Also Published As
Publication number | Publication date |
---|---|
ITRE20040152A1 (en) | 2005-03-22 |
PL1674228T3 (en) | 2015-08-31 |
CN1792592B (en) | 2010-05-26 |
EP1674228A3 (en) | 2006-10-25 |
CN1792592A (en) | 2006-06-28 |
PT1674228E (en) | 2015-06-25 |
RU2412049C2 (en) | 2011-02-20 |
RU2005138889A (en) | 2007-06-20 |
EP1674228A2 (en) | 2006-06-28 |
ES2538492T3 (en) | 2015-06-22 |
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