EP0865870A2 - Method for sizing natural- or synthetic-stone elements, particularly ceramic tiles, and machine for carrying out the method - Google Patents
Method for sizing natural- or synthetic-stone elements, particularly ceramic tiles, and machine for carrying out the method Download PDFInfo
- Publication number
- EP0865870A2 EP0865870A2 EP98103581A EP98103581A EP0865870A2 EP 0865870 A2 EP0865870 A2 EP 0865870A2 EP 98103581 A EP98103581 A EP 98103581A EP 98103581 A EP98103581 A EP 98103581A EP 0865870 A2 EP0865870 A2 EP 0865870A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wear
- pair
- sizing
- grinding wheel
- size
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
- B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
Definitions
- the invention relates to a method for sizing elements made of natural or synthetic stone, particularly ceramic tiles, and to the machine associated thereto, i.e., to a new method for sizing and advantageously also squaring the edges of the tiles, and to a machine adapted to carry out the method.
- the state of the art comprises a method which entails sorting the tiles or product elements in general, before grading, according to at least two sizes (with reference to the dimensions of the format).
- the sizing operation is performed on both pairs of sides of each element, in two successive steps, by intermediate rotation through 90 o , by means of grinding machines with diamondized grinding wheels, installed bilaterally with respect to the transfer line of said elements and, only in the case of porcelainized gres tiles, generally by associating it with the requirement of said material to be mostly dressed on the exposed face, with the consequent compulsory need for water cooling.
- the sizing method currently performed has first of all a drawback due to the use of diamondized grinding wheels, since it entails that the product absorbs water, or cooling liquid in general, and that therefore it is necessary to wait for the product to dry before packaging in order to prevent soaking of the container, which is generally made of paper-like material.
- Another severe drawback is the need to adopt a plurality of sizes of the product in order to contain the tolerance range within each size class, in order to comply with the planned tolerances in the use of the product.
- the invention solves the above problem by adopting a method for the dry sizing of natural- or synthetic-stone elements, optionally associated with squaring, eliminating the plurality of sizes; as regards the additional aspect of eliminating the drawbacks due to the rapid wear of the grinding wheels, by providing a method for automatically compensating for said wear without any interruption of the process, which consists in returning the working face of the grinding wheel, or tool in general, into the working position after backing off the grinding wheel at preset time intervals.
- the fraction of workload that is neutralized for the backoff of one pair of grinding wheels is assigned to the next pair, while the fraction that is neutralized for the backoff of the last pair can be assigned to the preceding pair;
- control of the wear of the last pair of grinding wheels of each plant section is assigned to the section that controls the size of the element being processed in the corresponding plant section; compensation for the wear of the last pair is controlled by reading the size reached by the element being processed.
- the sizing method entails:
- the advantages achieved by the present invention are: the elimination of the need to resort to more than one size, with a very significant simplification in terms of processing, storage, administration and transport and a consequent considerable cost reduction; the possibility to use dry sizing and squaring, eliminating the waiting times and the associated costs for the drying of the items before placing them in the packages; the production -- by means of the squaring and of the subsequent checks -- of elements which are geometrically precise and particularly adapted for laying without gaps; the elimination of wet sizing and squaring, with the consequent elimination of the waiting times for the drying of the element being processed; the possibility of performing processing directly at the exit of the kiln, i.e., online, differently from what occurs in wet sizing and optional squaring, which must be performed in an adapted environment, separately from the production line: therefore, a further cost reduction; the possibility to work both with glazed products and with non-glazed products, consequently expanding the product range; higher productivity.
- the reference numeral 1 designates a motor, for example an electric one, from a spindle 2 of which a shaft 3 protrudes.
- the shaft 3 supports a grinding wheel 4 or abrasive tool for dry working, made for example of carborundum, which is adapted to grind the edge of an element 5 being processed and to perform any squaring.
- the reference numeral 6 designates a sensor, for example of the fiber-optic photocell type, which is arranged transversely and bilaterally in a position which is proximate to the edge of the element to be ground and at a distance from said ground edge.
- the reference numeral 7 designates at least one sleeve which supports, so that it can slide in a longitudinally guided manner, the motor 1 on at least one guide 8.
- the reference numeral 9 designates a linear actuator, for example of the step type, which actuates the movement of the at least one sleeve 7.
- the reference numeral 10 designates the supporting frame.
- the reference numeral 11 (figure 3) designates at least one pair of oscillating elements, for example leaf springs, which support the motor 1, protrude from a base 12 and are actuated by a linear actuator 13.
- the reference numeral 14 designates conveyor belts or elements for conveying the elements being processed.
- the reference numerals 15, 16 and 17 designate the frames of the machine sections that compose the plant.
- the reference numerals 18 and 19 designate the devices for measuring and checking, respectively, the size of a pair of edges and for measuring and checking the size of the other pair and the squaring.
- the reference numeral 20 designates the device for centering the elements being machined.
- the reference numeral 21 designates the device for presetting for squaring, which in each instance can act on the rear edge or on the front edge of said elements.
- the reference numeral 22 (figure 8) designates the first section of the sizing plant.
- the reference numeral 23 designates the second section, which optionally also comprises squaring;
- the reference numerals 24, 25 designate the two measurement and control sections with optional automatic feedback to perform the necessary corrections of the active position of the grinding wheel or wheels, advantageously on the last pair thereof which is part of the machines 1.
- the reference numerals 26 and 27 designate the device for optional correction after comparison between the read measurement and the reference measurement.
- the sizing method is carried out as follows. Sizing of the first pair of sides of the element 5 being processed occurs in the first plant section 15, where the element 5, conveyed by the line 14, is centered in the device 20 for centering with respect to the longitudinal axis of said first section, after positioning the pairs of grinding wheels 4, which work dry and are rotationally actuated by the motors 1 and moved into position by the respective linear actuators 9 or 13, so that each one reaches the working front according to a preset program, determining the distance d from the front of the corresponding plant section.
- the various and subsequent pairs of grinding wheels 4 gradually reduce the width of the element 5 until one reaches the dimension that corresponds to the preset size, which is checked by the device 18, while said element 5 continues through the rotation station (the so-called carousel) and then enters the second plant section 17.
- the element 5 undergoes an additional centering operation which is simultaneous with, or subsequent to, a positioning step for squaring, which is performed one element at a time by sets of elements 5, with subsequent insertion between the pairs of grinding wheels 4 which are adapted to perform, where necessary, simultaneously with squaring, also the sizing of the other dimension of the second pair of sides of the element being processed.
- This is followed by dimensional checking of the second size and by geometric checking of squareness, by measuring the angle or by comparing the lengths of the diagonals.
- compensation occurs mainly as follows.
- the linear actuator backs off each grinding wheel 4 by an extent which is sufficient to clear the path related to the sensor 6 and then returns the grinding wheel to the working front, and so forth.
- the fraction of workload that is neutralized during backoff is assigned to the next pair of grinding wheels 4 or to the next grinding wheel, except for the last fraction, which can be assigned to the preceding grinding wheel or pair of grinding wheels.
- an adapted sensor When each grinding wheel 4 reaches its wear limit, an adapted sensor, not shown, produces the backoff of said grinding wheel, the issuing of an adapted alarm and operational presetting for tool replacement. During replacement, the workload related to the grinding wheel is assigned to other grinding wheels, as in the case of wear compensation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Ceramic Products (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
Claims (17)
- A method for sizing elements made of natural or synthetic stone, particularly ceramic tiles, which comprises the sizing and optional squaring, on both pairs of sides, of each natural- or synthetic-stone element in two successive steps by means of an intermediate rotation through 90o, characterized in that sizing and optional squaring are achieved by means of a dry grinding process with continuous compensation of the wear of at least one grinding wheel.
- A method according to claim 1, characterized in that a single size is used for the dimensions of each element.
- A method according to claim 1, characterized in that it comprises the steps of:-- sizing the element in a first plant section, with subsequent removal of thickness of each edge of a pair of sides until finishing occurs by reaching the size;-- checking the dimensions of the size by measurement and comparison;-- rotating through 90o;-- centering the element in a second plant section and performing optional squaring:-- sizing the second pair of sides, where necessary;-- geometrically checking the squaring, if performed;-- checking the dimensions of the size of the second pair of sides; compensation of the wear of the at least one grinding wheel being provided.
- A method according to claim 1, characterized in that the wear of the at least one dry grinding wheel is compensated according to time intervals which are preset according to the degree of precision of the element being processed and to the wear characteristics of the grinding wheel.
- A method according to claim 4, characterized in that wear compensation on the at least one grinding wheel is performed after backing off from the working front in order to measure the value of the wear.
- A method according to claim 5, characterized in that the grinding wheel backoff value between the working front and the front of said grinding wheel is sufficient to clear the control path of an interposed control means.
- A method according to claim 6, characterized in that the front of each grinding wheel returns to the working front by moving by an extent which is equal to the extent of the backoff, including the value of the grinding thickness of the edge of the element, plus the wear that has occurred in the previous time interval.
- A method according to claim 7, characterized in that the work load fraction of one pair of grinding wheels is assigned to the next pair of grinding wheels.
- A method according to claim 7, characterized in that the workload fraction that is neutralized in the backoff of one pair of grinding wheels is assigned to the preceding pair of grinding wheels.
- A method according to claim 4, characterized in that control of the compensation of the wear of the last pair of grinding wheels of each plant section is assigned to the size control section of the corresponding plant section: wear compensation being actuated by reading the size of the element being processed.
- A machine for sizing elements made of natural or synthetic stone, particularly ceramic tiles, characterized in that it comprises at least one dry abrasive tool (4) which is made to rotate about its own axis and moves axially with respect to an element (5) being processed.
- A machine according to claim 11, characterized in that at least one sensor (6) is interposed -- with its own path -- between said element (5) being processed and each one of said abrasive tools (4).
- A machine according to claim 12, characterized in that said abrasive tool (4), rotationally actuated by a motor (1), is allowed to slide axially on at least one guide (8) by means of a linear actuator (9) which is supported on a frame (10).
- A machine according to claim 13, characterized in that said abrasive tool (4) rotationally actuated by the motor (1) is allowed to slide axially by means of a linear actuator (13) which acts on a pair of oscillating elements (11).
- A plant for treating natural or synthetic stone elements, particularly ceramic tiles, characterized in that it comprises a machine as defined in claim 11.
- A plant according to claim 15, characterized in that it comprises elements (14) for conveying the natural-or synthetic-stone elements (5) which are sized and/or squared by dry abrasive tools (4), after passing through a centering device (20) and optionally a squaring device (21), with subsequent measurement and control sections with optional automatic feedback.
- A plant according to claim 15, characterized in that it further comprises a device (26, 27) for size correction after comparison between the read measurement and the reference measurement in each plant section (15, 17).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MO000039A IT1292686B1 (en) | 1997-03-11 | 1997-03-11 | METHOD FOR CALIBRATING NATURAL OR ARTIFICIAL STONE ELEMENTS, PARTICULARLY CERAMIC TILES, AND RELATED MACHINE. |
ITMO970039 | 1997-03-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0865870A2 true EP0865870A2 (en) | 1998-09-23 |
EP0865870A3 EP0865870A3 (en) | 2000-05-17 |
EP0865870B1 EP0865870B1 (en) | 2002-12-11 |
Family
ID=11386278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980103581 Expired - Lifetime EP0865870B1 (en) | 1997-03-11 | 1998-03-02 | Method for sizing natural- or synthetic-stone elements, particularly ceramic tiles, and machine for carrying out the method |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0865870B1 (en) |
DE (1) | DE69809986D1 (en) |
ES (1) | ES2186934T3 (en) |
IT (1) | IT1292686B1 (en) |
PT (1) | PT865870E (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000054932A1 (en) * | 1999-03-18 | 2000-09-21 | Galimberti Romolo S.P.A. | Automatic smoothing and polishing system for plates and blocks made of marble, granite and stone in general |
WO2003106128A1 (en) * | 2002-06-13 | 2003-12-24 | Max Bögl Bauunternehmung GmbH & Co. KG | Method and device for the production of a precise concrete prefabricated part |
EP1422024A1 (en) * | 2002-11-20 | 2004-05-26 | BIESSE S.p.A. | Method for controlling the operating position of a grinding wheel used in a machine for machining edges of plates of glass, marble and similar stony materials, and machine for implementing said method |
EP1468784A2 (en) * | 2003-04-16 | 2004-10-20 | Forvet S.r.l. | Grinding head for a grinding machine for glass slabs, and machine equipped with such head |
CN100343020C (en) * | 2004-12-31 | 2007-10-17 | 广东科达机电股份有限公司 | Dry ceramic tile edger |
EP1955810A2 (en) | 2007-02-12 | 2008-08-13 | Maincer, S.L. | Grinding machine for ceramic tiles |
EP2145729A1 (en) * | 2008-07-17 | 2010-01-20 | Maincer, S.L. | Machine for unifying tile profiles |
ITUA20164621A1 (en) * | 2016-06-23 | 2017-12-23 | Ancora Spa | PLANT AND METHOD OF CALIBRATION AND / OR SQUARING OF SQUARABLE ELEMENTS, SUCH AS CERAMIC ARTICLES OR NATURAL AND SIMILAR STONES |
IT201600087008A1 (en) * | 2016-08-24 | 2018-02-24 | Elettromeccanica Bovone Srl | REGULATED DEVICE FOR PERFECT PROCESSING OF FLAT SHEETS |
IT201800006214A1 (en) * | 2018-06-11 | 2019-12-11 | MACHINE AND ANTIQUE LINE OF SHEETS OF CONSTRUCTION MATERIALS | |
IT201800009638A1 (en) * | 2018-10-19 | 2020-04-19 | Bottero Spa | METHOD FOR THE GRINDING OF GLASS SHEETS |
IT201900004559A1 (en) * | 2019-03-27 | 2020-09-27 | Neptun S R L | Automatic tool measuring method and device, particularly for glass grinding machines. |
IT201900010563A1 (en) * | 2019-07-01 | 2021-01-01 | Alfa Impianti Soc A Responsabilita Limitata Semplificata | GRINDING MACHINE AND CONTROL METHOD OF THE SAME |
IT202000004819A1 (en) * | 2020-03-06 | 2021-09-06 | Bottero Spa | UNIT FOR GRINDING OR POLISHING A SHEET, IN PARTICULAR A GLASS SHEET, AND METHOD OF WORKING THE SHEET USING THIS UNIT |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10133607C5 (en) * | 2001-02-14 | 2010-08-19 | Max Bögl Bauunternehmung GmbH & Co. KG | Method and pallet for producing a precise precast concrete part |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4524547A (en) * | 1983-09-06 | 1985-06-25 | Litton Industrial Products, Inc. | Automatic double disc grinder control cycle |
DE4136252A1 (en) * | 1990-11-12 | 1992-05-14 | Toncelli Dario | Installation for checking length and width of stone or ceramic tiles - has mechanism to bevel tile edges if required |
EP0697558A1 (en) * | 1994-07-25 | 1996-02-21 | Shonan Gosei - Jushi Seisakusho K.K. | Cutter apparatus |
WO1996011083A1 (en) * | 1994-10-11 | 1996-04-18 | Keller Gmbh | Lateral evening process and device |
-
1997
- 1997-03-11 IT IT97MO000039A patent/IT1292686B1/en active IP Right Grant
-
1998
- 1998-03-02 PT PT98103581T patent/PT865870E/en unknown
- 1998-03-02 DE DE69809986T patent/DE69809986D1/en not_active Expired - Lifetime
- 1998-03-02 ES ES98103581T patent/ES2186934T3/en not_active Expired - Lifetime
- 1998-03-02 EP EP19980103581 patent/EP0865870B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4524547A (en) * | 1983-09-06 | 1985-06-25 | Litton Industrial Products, Inc. | Automatic double disc grinder control cycle |
DE4136252A1 (en) * | 1990-11-12 | 1992-05-14 | Toncelli Dario | Installation for checking length and width of stone or ceramic tiles - has mechanism to bevel tile edges if required |
EP0697558A1 (en) * | 1994-07-25 | 1996-02-21 | Shonan Gosei - Jushi Seisakusho K.K. | Cutter apparatus |
WO1996011083A1 (en) * | 1994-10-11 | 1996-04-18 | Keller Gmbh | Lateral evening process and device |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000054932A1 (en) * | 1999-03-18 | 2000-09-21 | Galimberti Romolo S.P.A. | Automatic smoothing and polishing system for plates and blocks made of marble, granite and stone in general |
WO2003106128A1 (en) * | 2002-06-13 | 2003-12-24 | Max Bögl Bauunternehmung GmbH & Co. KG | Method and device for the production of a precise concrete prefabricated part |
CN100358696C (en) * | 2002-06-13 | 2008-01-02 | 马克斯·博格建筑两合公司 | Method and device for the production of a precise concrete prefabricated part |
EP1422024A1 (en) * | 2002-11-20 | 2004-05-26 | BIESSE S.p.A. | Method for controlling the operating position of a grinding wheel used in a machine for machining edges of plates of glass, marble and similar stony materials, and machine for implementing said method |
EP1468784A2 (en) * | 2003-04-16 | 2004-10-20 | Forvet S.r.l. | Grinding head for a grinding machine for glass slabs, and machine equipped with such head |
EP1468784A3 (en) * | 2003-04-16 | 2005-05-11 | Forvet S.r.l. | Grinding head for a grinding machine for glass slabs, and machine equipped with such head |
CN100343020C (en) * | 2004-12-31 | 2007-10-17 | 广东科达机电股份有限公司 | Dry ceramic tile edger |
EP1955810A2 (en) | 2007-02-12 | 2008-08-13 | Maincer, S.L. | Grinding machine for ceramic tiles |
EP1955810A3 (en) * | 2007-02-12 | 2008-10-22 | Maincer, S.L. | Grinding machine for ceramic tiles |
EP2145729A1 (en) * | 2008-07-17 | 2010-01-20 | Maincer, S.L. | Machine for unifying tile profiles |
ITUA20164621A1 (en) * | 2016-06-23 | 2017-12-23 | Ancora Spa | PLANT AND METHOD OF CALIBRATION AND / OR SQUARING OF SQUARABLE ELEMENTS, SUCH AS CERAMIC ARTICLES OR NATURAL AND SIMILAR STONES |
WO2017221212A1 (en) * | 2016-06-23 | 2017-12-28 | Ancora S.P.A. | System and method for calibrating and/or squaring squareable elements, such as ceramic or natural stone items and the like |
IT201600087008A1 (en) * | 2016-08-24 | 2018-02-24 | Elettromeccanica Bovone Srl | REGULATED DEVICE FOR PERFECT PROCESSING OF FLAT SHEETS |
WO2018037303A1 (en) * | 2016-08-24 | 2018-03-01 | Elettromeccanica Bovone Srl | Enhanced adjustment device for machining flat sheets |
US11344992B2 (en) | 2016-08-24 | 2022-05-31 | Elettromeccanica Bovone Srl | Enhanced adjustment device for machining flat sheets |
IT201800006214A1 (en) * | 2018-06-11 | 2019-12-11 | MACHINE AND ANTIQUE LINE OF SHEETS OF CONSTRUCTION MATERIALS | |
IT201800009638A1 (en) * | 2018-10-19 | 2020-04-19 | Bottero Spa | METHOD FOR THE GRINDING OF GLASS SHEETS |
EP3639973A1 (en) * | 2018-10-19 | 2020-04-22 | Bottero S.p.A. | Method for grinding glass sheets |
IT201900004559A1 (en) * | 2019-03-27 | 2020-09-27 | Neptun S R L | Automatic tool measuring method and device, particularly for glass grinding machines. |
EP3715052A1 (en) * | 2019-03-27 | 2020-09-30 | Neptun S.r.l. | Method and device for the automatic measurement of tools, particularly for grinding machines for glassworking |
IT201900010563A1 (en) * | 2019-07-01 | 2021-01-01 | Alfa Impianti Soc A Responsabilita Limitata Semplificata | GRINDING MACHINE AND CONTROL METHOD OF THE SAME |
IT202000004819A1 (en) * | 2020-03-06 | 2021-09-06 | Bottero Spa | UNIT FOR GRINDING OR POLISHING A SHEET, IN PARTICULAR A GLASS SHEET, AND METHOD OF WORKING THE SHEET USING THIS UNIT |
EP3875219A1 (en) * | 2020-03-06 | 2021-09-08 | Bottero S.p.A. | Grinding or polishing unit of a sheet, in particular a glass sheet, and method for processing sheets using such unit |
Also Published As
Publication number | Publication date |
---|---|
ITMO970039A1 (en) | 1998-09-11 |
PT865870E (en) | 2003-04-30 |
EP0865870B1 (en) | 2002-12-11 |
IT1292686B1 (en) | 1999-02-11 |
EP0865870A3 (en) | 2000-05-17 |
DE69809986D1 (en) | 2003-01-23 |
ES2186934T3 (en) | 2003-05-16 |
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