Patent EP0179445A1 successfully refreshed from Google Patents.
EP0179445A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process and apparatus for joining protective plastic films to an extruded plastic sheeet, with the aid of an auxilairy plastic film
Assignee: Carbolux SpA
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Filing: 1985-10-22
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Granted: —
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Expires: 2005-10-22
Abstract
Abstract A process and apparatus are described wherein a honeycombed sheet of plastic (13) is extruded from an extruding means (10) and at least one protective film of plastic is joined onto at least one of its surface layers, said protective film having a softening temperature lower than that for extruding the sheet. According to the invention the protective film (14), combined with the auxiliary film or support film (15), is layed onto the surface of the sheet (13) leaving the extruding means; then said sheet (13), protective film (14) and support film (15) are subjected to the calibrating and cooling stage; and lastly said support film (15) is separated from the sheet. The protective film has now been made an integral part of the sheet, (protected honeycombed sheet).
Inventors
- 👤 Stefano De Bernardi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 09:31
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/10; B29; B29C; B29C65/00; B29C65/02; B29C65/022; B29C65/028; B29C65/14; B29C65/1429; B29C65/1432; B29C65/1464; B29C65/1467; B29C65/78; B29C65/7855; B29C66/00; B29C66/003; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/45; B29C66/50; B29C66/51; B29C66/53; B29C66/532; B29C66/5326; B29C66/70; B29C66/72; B29C66/725; B29C66/7252; B29C66/72523; B29C66/73; B29C66/731; B29C66/7311; B29C66/73115; B29C66/73116; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8145; B29C66/81457; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/83421; B29C66/836; B32B37/00; B32B37/04; B32B37/14; B32B37/146; B32B38/18; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/0021; B29C48/0022; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/11; B29C48/16; B29C48/18; B29C48/23; B29C66/71; B29L; B29L2009/00; B29L2024/00; B29L2024/006; B32B37/02; B32B37/025; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1705; Y10T156/1712; Y10T156/1715; Y10T156/19; Y10T156/1911
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
A process according to which a sheet of plastic (13) is extruded frcm an extruding means (10) and then at least one protective filr of plastic is joined onto at least one of its surface layers, said protective film having a softening temperature lower than that for extruding the sheet; characterized in that the protective film (14), joined to an auxiliary film or support film (15), is layed on the surface of the sheet (13) coming out of the extruding means, then the combination of sheet (13), protective film (14) and support film (15), guided. pulled and held against the surface of the sheet (13) is subjected to the calibration and cooling stage, and finally said auxiliary film (15) is removed from the cooled combination, made up of the sheet (13) now integral with the protective film (14).
Claim 2
Dependent Claim
138 words
A process according to which a sheet of plastic (13) is extruded frcm an extruding means (10) and then at least one protective filr of plastic is joined onto at least one of its surface layers, said protective film having a softening temperature lower than that for extruding the sheet; characterized in that the protective film (14), joined to an auxiliary film or support film (15), is layed on the surface of the sheet (13) coming out of the extruding means, then the combination of sheet (13), protective film (14) and support film (15), guided. pulled and held against the surface of the sheet (13) is subjected to the calibration and cooling stage, and finally said auxiliary film (15) is removed from the cooled combination, made up of the sheet (13) now integral with the protective film (14).
Claim 3
Dependent Claim
32 words
A process according to claim 1, characterized in that the protective film (14) and the support film (15) are combined together by heating before being brought into contact with the sheet (13).
Claim 4
Dependent Claim
34 words
A process according to claim 1, characterized in that said protective film (14) and the support film (15) are combined by being pressed together before they are brought into contact with the sheet (13).
Claim 5
Independent Claim
104 words
An apparatus for carrying out the joining of protective film (14) to extruded sheets (13), characterized in that it comprises a die box (10) for extruding the sheet (13), at least one means of guiding the protective film (14), joined to a support film (15), to lay the protective film (14) on the surface of the sheet, at least one cooling-calibrating means (17a, 17b) and at least one means of bearing the reel (18) for rewinding the support film (15), after the combination formed by the shee: (13) and the protective film applied to one of its outer surfa:es has left the calibration device.
Claim 6
Independent Claim
104 words
An apparatus for carrying out the joining of protective film (14) to extruded sheets (13), characterized in that it comprises a die box (10) for extruding the sheet (13), at least one means of guiding the protective film (14), joined to a support film (15), to lay the protective film (14) on the surface of the sheet, at least one cooling-calibrating means (17a, 17b) and at least one means of bearing the reel (18) for rewinding the support film (15), after the combination formed by the shee: (13) and the protective film applied to one of its outer surfa:es has left the calibration device.
Claim 7
Dependent Claim
50 words
An apparatus according to claim 4, characterized in that it further comprises a cooling screen (12), placed between the die box (10) and the protective film (14) to be joined on so as to prevent heat radiation coming from the die box metallic surfaces softening the protective film too soon.
Claim 8
Dependent Claim
43 words
An apparatus according to claim 4, characterized in that the rreans for guiding the protective film (14) with the support film (15) is composed of at least one pair of rollers (9a and 9b) which combine the two films by pressing them together.
Claim 9
Dependent Claim
33 words
An apparatus according to claim 4, characterized in that it comprises at least one heating means for joining one surface of the protective film (14) to the support film (15) by thermal combining.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 4, characterized in that the support film (15) is made of fluoridated resin or polyester.
Claim 11
Dependent Claim
24 words
An apparatus according to claim 8, characterized in that said support film (15) has a softening temperature around 260°C and is about 100µm thick.
Claim 12
Dependent Claim
28 words
An apparatus according to claim 4, characterized in that it comprises only one traction device which is that provided for drawing the sheet coming out of the extruder.
Claim 13
Dependent Claim
32 words
An apparatus according to claim 4, characterized in that the bearing means (18) for rewinding the support film (15) is actuated by a motive means (22) using an adjustable clutch device (24).
Claim 14
Dependent Claim
35 words
An apparatus according to claim 4, characterized in that it comprises at least one roller at the area where the support film (15) and the sheet (13) and protective film (14), now joined together, separate.
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US3185614A
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US3434862A
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DE1704496A1
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FR1596114A
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DE1941830A1
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DE2427129A1
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EP0002174A1
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