EP0283072A2 - Alveolar sheet of polycarbonate - Google Patents
Alveolar sheet of polycarbonate Download PDFInfo
- Publication number
- EP0283072A2 EP0283072A2 EP88200354A EP88200354A EP0283072A2 EP 0283072 A2 EP0283072 A2 EP 0283072A2 EP 88200354 A EP88200354 A EP 88200354A EP 88200354 A EP88200354 A EP 88200354A EP 0283072 A2 EP0283072 A2 EP 0283072A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- polycarbonate
- added
- layer
- baffles
- sheet
- 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- Withdrawn
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/54—Slab-like translucent elements
- E04C2/543—Hollow multi-walled panels with integrated webs
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/66—Units comprising two or more parallel glass or like panes permanently secured together
- E06B3/67—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light
- E06B3/6715—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light specially adapted for increased thermal insulation or for controlled passage of light
Definitions
- the present invention relates to an alveolar sheet of polycarbonate comprising a first outer wall and a second outer wall, with both of said walls being horizontal and parallel, and joined with each other by perpendicular, equidistant baffles. At least one of said outer walls comprises a polycarbonate layer, to which a substance capable of neutralizing the action of U.V. light -- which in the following is simply denominated "U.V.-protective substance" -- is added.
- the alveolar sheets of polycarbonate are used above all in the industrial buildings for replacing glass when large luminous surfaces endowed with optimum characteristics of thermal insulation, impact strength, light-weight, easy assemblage and transportation, have to be accomplished.
- polycarbonate is known to the particularly sensitive to U.V. light, the sun light is composed by.
- the U.V. beam impinging against an U.V.-protective particle is obviously neutralized by the said particle.
- At least one of the two outer walls, kept bonded to the other outer wall by vertical baffles, is constituted by two overlapping polycarbonate layers.
- the first, outermost, layer is constituted by simple polycarbonate
- the second layer, underlying the first layer, and adherent to it is constituted by polycarbonate to which an U.V.-protective substance is added.
- the purpose of the present invention is to provide a sheet which makes it possible the above drawbacks to be obviated, and which is hence endowed with a good level of resistance to ageing, even if low percentages of U.V.-protective substance are used, and which, thanks to the use of limited percentages of U.V.-protective substance is also cheap and easily extrudable.
- the alveolar sheet of polycarbonate of the present invention comprises a first outer wall and a second outer wall, both of which are horizontal and parallel, and are joined with each other by equidistant perpendicular baffles, with at least one of said two outer walls comprising a layer of polycarbonate to which an U.V. light neutralizing substance is added, and is characterized in that it comprises, associated with said layer of polycarbonate to which an U.V. light neutralizing substance is added, a set of layers perpendicular to said layer, which perpendicular layers also are made from polycarbonate to which an U.V.-protective substance is added.
- the advantages obtained by means of the present invention are substantially those of producing a sheet which, with its resistance to ageing being the same, results cheaper, and more easily extrudable.
- the better extrusion ability of the sheet results in a reduction in the pieces affected by imperfections.
- Figure 1 shows a perspective view of a piece of sheet manufactured according to the invention.
- the sheet of the invention is a polycarbonate sheet of alveolar type.
- first outer wall 2 and a second outer wall 3 which are joined with each other by a plurality of baffles 4 positioned perpendicularly to the same walls 2 and 3.
- the first wall 2 is constituted by an outer layer 5 of pure carbonate adhering to an inner layer 6 of polycrbonate to which an U.V.-protective substance is added.
- the inner layer 6 is constituted by 96% of polycarbonate and 4% of U.V.-protective substance.
- the perpendicular baffles 4 have a thickness which is substantially equal to the thickness of the walls 2 and 3 and in the nearby of their middle axis, baffles 7 are provided, which are parallel to the walls 2 and 3, and have a thickness lower than the thickness of the perpendicular baffles 4.
- the portions 10 of the perpendicular baffles 4 between the baffles 7 and the inner layer 6 are constituted by a structure having, for purely indicative purposes, a composition of 98% of polycarbonate, to which a 2% of U.V.-protective substance is added.
- the sheet 1 is assembled in the building in such a way that the wall 2 is directed towards the light source generating the U.V. light. Nearly all of the U.V. light impinging of the wall 2 is neutralized by the inner layer 6, and the outer layer 5 performs a simple action of protection of the inner layer 6 from possible attacks of chemical, or mechanical nature, which may take place above all during the sheet extrusion process.
- the overall effectiveness of the inner layer 6 associated with the pluralty of portions of baffles 10 perpendicular to it, is generally higher than it would be obtained by means of a single layer, or of a plurality of parallel layers containing, in the overall, identical percentages of U.V.-protective substance.
- the layer(s) of polycarbonate containing the U.V.-protective substance, and associated with the perpendicular baffles 4 can be also extended, of course, along the portions 6.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Dental Preparations (AREA)
- Panels For Use In Building Construction (AREA)
Abstract
At least one of said two outer wall (2.3) and said perpendicular baffles (4) comprise a layer of polycarbonate to which an U.V. light neutralizing substance is added.
Description
- The present invention relates to an alveolar sheet of polycarbonate comprising a first outer wall and a second outer wall, with both of said walls being horizontal and parallel, and joined with each other by perpendicular, equidistant baffles. At least one of said outer walls comprises a polycarbonate layer, to which a substance capable of neutralizing the action of U.V. light -- which in the following is simply denominated "U.V.-protective substance" -- is added.
- The alveolar sheets of polycarbonate are used above all in the industrial buildings for replacing glass when large luminous surfaces endowed with optimum characteristics of thermal insulation, impact strength, light-weight, easy assemblage and transportation, have to be accomplished.
- However, polycarbonate is known to the particularly sensitive to U.V. light, the sun light is composed by.
- Such U.V. light has the property of neutralizing the molecular bonds which endow the polycarbonate with the excellent mechanical characteristics it is provided with, causing it to rapidly decay. In the presence of such a phenomenon, those skilled in the art are used to speak in terms of "polycarbonate ageing".
- In order to obviate such a drawback, it is known to blend a U.V.-protective substance to polycarbonate during the extrusion step. Said U.V.-protective substance performs its function by performing a filtering action, of random character, of U.V. light.
- In other terms, the higher the concentration of particles of U.V.-protective substances per each unit of surface area to be protected, the higher the probability that a U.V. beam impinging on the same surface meets one of said particles, rather than a molecule of polycarbonate. The U.V. beam impinging against an U.V.-protective particle is obviously neutralized by the said particle.
- A sheet as above described is already known from European patent No. 110,238.
- According to such patent, in said sheet at least one of the two outer walls, kept bonded to the other outer wall by vertical baffles, is constituted by two overlapping polycarbonate layers.
- The first, outermost, layer, is constituted by simple polycarbonate, and the second layer, underlying the first layer, and adherent to it, is constituted by polycarbonate to which an U.V.-protective substance is added.
- Such a structure, although fulfils in a satisfactory way the tasks it was designed for, suffers from some drawbacks. Those skilled in the art know that the addition of the U.V.-protective substance impairs the extrusion ability characteristics of a polycarbonate containing such an additive, and that, therefore, the higher the percentage of U.V.-protective substance, the more difficult the sheets to be obtained with no extrusion drawbacks.
- Furthermore, from a probabilistic standpoint, the increase, beyond certain limits, of the concentration of U.V.-protective substances along one surface only of the sheet, does not result in a proportional increase in protection, but in an actual protection increase, which is proportionally lower and lower, until a saturation limit is reached.
- One should furthermore bear in his mind that the U.V.-protective substance is particularly expensive, and that the manufacturers of the sheets are interested in keeping the used percentages thereof as low as possible.
- The purpose of the present invention is to provide a sheet which makes it possible the above drawbacks to be obviated, and which is hence endowed with a good level of resistance to ageing, even if low percentages of U.V.-protective substance are used, and which, thanks to the use of limited percentages of U.V.-protective substance is also cheap and easily extrudable.
- The alveolar sheet of polycarbonate of the present invention comprises a first outer wall and a second outer wall, both of which are horizontal and parallel, and are joined with each other by equidistant perpendicular baffles, with at least one of said two outer walls comprising a layer of polycarbonate to which an U.V. light neutralizing substance is added, and is characterized in that it comprises, associated with said layer of polycarbonate to which an U.V. light neutralizing substance is added, a set of layers perpendicular to said layer, which perpendicular layers also are made from polycarbonate to which an U.V.-protective substance is added.
- The advantages obtained by means of the present invention are substantially those of producing a sheet which, with its resistance to ageing being the same, results cheaper, and more easily extrudable. The better extrusion ability of the sheet results in a reduction in the pieces affected by imperfections.
- The invention is disclosed in greater detail in the following, with the aid of the hereto attached drawing table, wherein Figure 1 shows a perspective view of a piece of sheet manufactured according to the invention.
- The sheet of the invention, generally indicated by the reference numeral 1, is a polycarbonate sheet of alveolar type.
- It is constituted by a first outer wall 2 and a second
outer wall 3, which are joined with each other by a plurality ofbaffles 4 positioned perpendicularly to thesame walls 2 and 3. - The first wall 2 is constituted by an
outer layer 5 of pure carbonate adhering to an inner layer 6 of polycrbonate to which an U.V.-protective substance is added. - For indicative purposes, the inner layer 6 is constituted by 96% of polycarbonate and 4% of U.V.-protective substance.
- The
perpendicular baffles 4 have a thickness which is substantially equal to the thickness of thewalls 2 and 3 and in the nearby of their middle axis, baffles 7 are provided, which are parallel to thewalls 2 and 3, and have a thickness lower than the thickness of theperpendicular baffles 4. - The
portions 10 of theperpendicular baffles 4 between the baffles 7 and the inner layer 6 are constituted by a structure having, for purely indicative purposes, a composition of 98% of polycarbonate, to which a 2% of U.V.-protective substance is added. - The sheet 1 is assembled in the building in such a way that the wall 2 is directed towards the light source generating the U.V. light. Nearly all of the U.V. light impinging of the wall 2 is neutralized by the inner layer 6, and the
outer layer 5 performs a simple action of protection of the inner layer 6 from possible attacks of chemical, or mechanical nature, which may take place above all during the sheet extrusion process. - The U.V. light which succeeds in overcoming the inner layer 6 is neutralized by the
baffle portions 10, with a particularly high effectiveness, precisely thanks to the perpendicular position of saidbaffle portions 10 relatively to the layer 6. - The overall effectiveness of the inner layer 6 associated with the pluralty of portions of
baffles 10 perpendicular to it, is generally higher than it would be obtained by means of a single layer, or of a plurality of parallel layers containing, in the overall, identical percentages of U.V.-protective substance. - The layer(s) of polycarbonate containing the U.V.-protective substance, and associated with the
perpendicular baffles 4 can be also extended, of course, along the portions 6.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2116987U IT210076Z2 (en) | 1987-03-18 | 1987-03-18 | POLYCARBONATE ALVEOLAR SHEET. |
IT2116987U | 1987-03-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0283072A2 true EP0283072A2 (en) | 1988-09-21 |
EP0283072A3 EP0283072A3 (en) | 1990-05-16 |
Family
ID=11177795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88200354A Withdrawn EP0283072A3 (en) | 1987-03-18 | 1988-02-25 | Alveolar sheet of polycarbonate |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0283072A3 (en) |
IT (1) | IT210076Z2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2406353A (en) * | 2003-09-03 | 2005-03-30 | Ultraframe Uk Ltd | Glazing panels |
WO2009041973A1 (en) * | 2007-09-27 | 2009-04-02 | Sabic Innovative Plastics Ip Bv | Polymer sheeting |
GB2464331A (en) * | 2008-07-03 | 2010-04-21 | David John Anderson | Glazing |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4114597A (en) * | 1975-12-31 | 1978-09-19 | The Franklin Institute | Unitary solar collector |
EP0054856A1 (en) * | 1980-12-23 | 1982-06-30 | Bayer Ag | Strutted double panels |
EP0110221A2 (en) * | 1982-11-25 | 1984-06-13 | Röhm Gmbh | Polycarbonate plastic panel |
DE3414116A1 (en) * | 1984-04-14 | 1985-10-24 | Bayer Ag, 5090 Leverkusen | UV-STABILIZED POLYCARBONATE MOLDED BODY |
-
1987
- 1987-03-18 IT IT2116987U patent/IT210076Z2/en active
-
1988
- 1988-02-25 EP EP88200354A patent/EP0283072A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4114597A (en) * | 1975-12-31 | 1978-09-19 | The Franklin Institute | Unitary solar collector |
EP0054856A1 (en) * | 1980-12-23 | 1982-06-30 | Bayer Ag | Strutted double panels |
EP0110221A2 (en) * | 1982-11-25 | 1984-06-13 | Röhm Gmbh | Polycarbonate plastic panel |
DE3414116A1 (en) * | 1984-04-14 | 1985-10-24 | Bayer Ag, 5090 Leverkusen | UV-STABILIZED POLYCARBONATE MOLDED BODY |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2406353A (en) * | 2003-09-03 | 2005-03-30 | Ultraframe Uk Ltd | Glazing panels |
WO2009041973A1 (en) * | 2007-09-27 | 2009-04-02 | Sabic Innovative Plastics Ip Bv | Polymer sheeting |
CN101878107A (en) * | 2007-09-27 | 2010-11-03 | 沙伯基础创新塑料知识产权有限公司 | Polymer sheeting |
GB2464331A (en) * | 2008-07-03 | 2010-04-21 | David John Anderson | Glazing |
Also Published As
Publication number | Publication date |
---|---|
IT210076Z2 (en) | 1988-11-14 |
EP0283072A3 (en) | 1990-05-16 |
IT8721169V0 (en) | 1987-03-18 |
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Effective date: 19920721 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19931019 |