Patent Application
20220341171
The present invention relates to a cladding or covering sheet for roofs, for example a sandwich panel, as well as a line for obtaining such sheet. The present invention also relates to a method for obtaining such a sheet.
Many cladding sheets have been proposed which differ from each other for configuration, thickness and also obtaining materials.
Clearly, the sheets must meet specific mechanical requirements, although sometimes it is necessary that the sheets also have a pleasant appearance, naturally depending on the place of installation.
With specific reference to the mechanical requirements, if the sheet should be connected to a layer of insulating material, it is not always possible to obtain a satisfactory constraint.
In any case, it is often necessary to accept sheets which actually constitute a compromise between the needs that arise from time to time.
An object of the present invention is to provide a new cladding or covering sheet for roofs or walls, in particular a sheet that can be used alone or as the face of a panel or as the internal side of a covering.
Another object of the present invention is to provide a sheet which ensures an improved adhesion to an insulating layer, in particular made of polyurethane.
Another object of the present invention is to provide a sheet that ensures an improvement in mechanical performance with respect to traditional sheets.
Another object of the present invention is to provide a sheet which is aesthetically pleasing.
Another object of the present invention is to provide a line and a method for obtaining a sheet as indicated above.
Another object of the present invention is to provide a line and a method for obtaining a sheet as indicated above in a simple and rapid manner.
According to an aspect of the invention, a sheet according to the present application is provided.
The present application refers to preferred and advantageous embodiments of the invention.
Other features and advantages of the invention will be more evident from the description of an embodiment of a sheet and a line, illustrated as an indication in the accompanying drawings in which:
In the accompanying drawings, identical parts or components are indicated by the same reference numbers.
With reference to the attached figures, a cladding or covering sheet 1 for roofs or walls has been illustrated, in particular a sheet that can be used alone or as the face of a panel or as the internal side of a covering.
The sheet 1 comprises an external face 1a and an internal face 1b and of course an edge section, which can include or define the sides 1c, 1d of the sheet 1 as well as the front edge section 1e and the rear edge section 1f.
The sheet 1 naturally has a width WD, a length LN and a thickness TH, the width WD and the length LN being the main dimensions defining a main extension plane of the sheet 1. In this regard, the external 1a and internal 1b faces define the width WD and the length LN of the sheet 1, while the edge 1c-1f defines the thickness TH.
The width WD and length LN of the sheet can be any suitable size.
The metal sheet 1 preferably has a constant thickness TH, for example between 0.3 and 1.2 mm, if desired between 0.4 and 1 mm.
The sheet can be made of any suitable material, for example of steel, if desired galvanized, pre-painted, stainless steel, or of pre-painted or natural aluminum or of copper.
Moreover, the sheet 1 comprises a plurality, for example between 10 and 80, if desired between 18 and 30 or between 50 and 80, of first fold lines or ribs 2 spaced apart with each other, each first line 2 extending or developing, clearly for its entire extension, in a respective direction lying in a plane defined by the width WD and the length LN, advantageously in the direction of the width WD.
Also provided in the sheet 1 are a plurality of second fold lines or ribs 3, for example between 10 and 80, if desired between 18 and 30 or between 50 and 80, spaced apart with each other, each second line 3 extending or developing, clearly for its entire extension, in a respective direction lying in a plane defined by the width WD and the length LN, advantageously in the direction of the length LN, which second lines 3 are incident or intersect the plurality of first fold lines or ribs 2. The first fold lines 2 are preferably orthogonal to the second fold lines 3.
Advantageously, the first fold lines 2 are straight and parallel to each other and also the second fold lines 3 are straight and parallel to each other.
Even more advantageously, the first fold lines 2 all lie in the same plane and the second fold lines 3 also all lie in this plane.
Preferably, the first fold lines or ribs 2 define a recessed area in the same first face 1a and a protruding area in the other or second face 1b of the sheet 1.
With reference to this aspect, all the first fold lines preferably affect or engage the sheet 1 so as to fold it in the direction from one face to the other, for example from the external face 1a to the internal face 1b.
Preferably, the second fold lines or ribs 3 define a recessed area in the same first face 1a and a protruding area in the other or second face 1b of the sheet 1.
Even more preferably, the first 2 and second 3 lines define a recessed area in the same first face 1a and a protruding area in the other or second face 1b of the sheet 1.
With reference to this aspect, the second fold lines 3 affect or engage the sheet 1 so as to fold it in the direction from one face to the other, for example from the external face 1a to the internal face 1b.
Therefore, it will be understood that the sheet 1 can advantageously have a first series 2 of fold lines running parallel to a first direction and a second series 3 of fold lines running parallel to a second direction, the two directions being preferably orthogonal to each other and moreover that for each direction of folding, the sheet can be folded in the direction from one face to the other, for example from the external face 1a to the internal face 1b.
With reference to this aspect, as already indicated in part, by folding a sheet 1, the sections of the latter defining the fold line 2, 3 delimit among them an angle greater than 180° on one face of the sheet and on the other an angle smaller than 180° conjugated thereto, at least in the portions of the fold lines 2, 3 that do not intersect or incident other fold lines 3, 2.
In this regard, a sheet 1 according to the present invention has fold lines 2, 3 that intersect or incident each other, so that in the areas of intersection of fold lines 2 and 3 the sheet 1 is folded so as not to define an angle greater or less than 180° as now indicated.
Advantageously, the sheet parts 4 defined between two adjacent and subsequent first fold lines 2 and between two adjacent and subsequent second fold lines 3 have a substantially pyramidal or polygonal mesh configuration, for example with vertex or vertex zone 4a substantially in the center of the respective sheet part 4, if desired equidistant from the two respective first fold lines 2 as well as, if desired equidistant from the two respective second fold lines 3, so as to define a recessed zone RZ in a face 1b of the sheet 1, in particular the face where the fold lines 2, 3 define a protruding area as well as (so as to define) a protruding zone PZ in the other face 1a.
Preferably, all the sheet parts 4 between two adjacent and subsequent first fold lines 2 and between two adjacent and subsequent second fold lines 3 define a recessed zone RZ in the same face 1b of the sheet 1.
According to the non-limiting embodiment illustrated in the figures, in some or each part of sheet 4 between two first adjacent and subsequent fold lines 2 and between two adjacent and subsequent second fold lines 3, four fold sections 4b, 4c, 4d, 4e are defined, that are preferably straight, which each extend from the vertex or vertex zone 4a to a respective segment 2a, 3a of a respective fold line 2, 3 defining the respective sheet part 4.
The segments 2a of each first fold line 2 are the portions of this fold line 2 which extend between two adjacent and subsequent second fold lines 3 intersecting said first fold line 2.
The segment 3a of each second fold line 2 are instead the portions of this fold line 3 which extend between two adjacent and subsequent first fold lines 2 intersecting said second fold line 3.
If desired, for some or each part of sheet 4, two first fold sections 4b, 4d lie in a plane, preferably orthogonal to the main extension of the sheet 1, which is parallel to as well as intermediate between the planes (preferably always orthogonal to the main extension of the sheet 1) where the two fold lines or ribs 2 defining the respective part of the sheet 4 lay.
Even more advantageously, two first fold sections 4b, 4d lie in a plane which is equidistant from the lying plane of the two fold lines or ribs 2 defining the respective sheet part 4.
Preferably, the two first fold sections 4b, 4d are inclined with respect to each other so as to define an angle, in the respective plane orthogonal to the main extension of the sheet 1 where they lie, if desired greater than 180°, for example between 190° and 260°, if desired between 190° and 210° identifiable on one face 1a of the sheet 1, and an acute angle conjugated thereto, for example between 170° and 100°, if desired between 170° and 150° identifiable on the other face 1b of sheet 1.
The other two fold portions or second fold portions 4c, 4e can instead lie in a plane, preferably orthogonal to the main extension of the sheet 1, which is intermediate between and if desired equidistant from the planes (preferably always orthogonal to the main extension of the sheet 1) where two second fold lines or ribs 3 defining the respective sheet part 4 lie.
Preferably, the two second fold sections 4c, 4e are inclined with respect to each other so as to define an angle, in the respective plane orthogonal to the main extension of the sheet 1 where they lie, if desired greater than 180°, for example between 190° and 260°, if desired between 190° and 210° identifiable on one face 1a of the sheet 1, and an acute angle conjugated thereto, for example between 170° and 100°, if desired between 170° and 150° identifiable on the other face 1b of sheet 1.
According to the non-limiting embodiment illustrated in the figures, the sheet parts 4 between two first adjacent and subsequent fold lines 2 and between two adjacent and subsequent second fold lines 3 have a substantially pyramidal configuration with four wall sections between them inclined each defined by a length of a first fold line 2, a length of a second fold line 3, a first fold section 4b or 4d and a second fold section 4c or 4e.
In accordance with the non-limiting embodiment illustrated in the figures, the sheet 1 has thus first fold lines or ribs 2 and second fold lines or ribs 3 and therefore a plurality of sheet parts 4 defined between two first fold lines 2 adjacent and subsequent and between two second adjacent and subsequent fold lines 3, which sheet parts 4 actually protrude or in any case project with respect to the fold lines 2, 3.
If desired, the first fold lines or ribs 2 and the second fold lines or ribs 3 preferably all extend in the same first plane, while the sheet parts 4 all extend or protrude in the same direction starting from the fold lines 2, 3 and between them.
In this case, the vertices or vertex zone 4a are substantially aligned in the same second plane at a distance from the first plane.
If desired, the fold lines 2, 3 have a depth between 0.5 and 2 mm, for example 0.7-0.9 mm.
By “depth” it is clearly meant the distance between the first plane defined by the fold lines 2, 3 and the second plane defined by the vertices 4a.
Preferably, one or more pairs of adjacent and subsequent first fold lines 2 are at a distance one from the adjacent or from each of the adjacent ones between 5 and 100 mm, for example between about 10 and about 20 mm or between about 40 and about 50 mm.
Advantageously, one or more pairs of adjacent and subsequent second fold lines 3 are at a distance one from the adjacent or from each of the adjacent ones between 5 and 100 mm, for example between about 10 and about 20 mm or between about 40 and about 50 mm.
Preferably, the distance between the first adjacent and subsequent fold lines 2 is substantially the same as that between the adjacent and subsequent second fold lines 3.
Clearly, a sheet 1 according to the present invention can have the configuration indicated above for most of its extension, for example more than 70%, 80% or 90%, while the remaining part may not be shaped as above indicated.
In this regard, the sheet 1 could have respective sides or flanks 1c, 1d suitably shaped for an interlocking constraint or even only resting with/on sheets, in use, next to and adjacent to it.
So far as the front edge section 1e and the rear edge section if are concerned, they could be straight or in any case not shaped except in the stations 6 and 7, which will be discussed later.
In accordance with the present invention, a sandwich panel is also provided, for example with a support or insulating first layer or main block (not shown in the figures), if desired in mineral wool, expanded polyurethane or rigid expanded foam in general or in glass wool, as well as at least a first metal sheet 1 applied or adhered to at least one external, in use, or, if desired, also internal face, of the first main support layer. If desired, a second sheet is also applied or adhered to the other external or internal, in use, face of the first main support layer.
Moreover, the first layer could also comprise coupled sub-layers, each made of a respective material.
If the first layer is made of expanded polyurethane or other expandable component, then the bond between the first layer and the sheet 1 could be obtained by adhesion following the expansion of the polyurethane or expandable component close to the first sheet 1 before the final hardening or solidification of the polyurethane or expandable component.
In this case, the insulating layer, in particular in the case in which it comprises polyurethane or an expandable component, is in contact with the internal face 1b where the recessed zones RZ are defined.
More specifically, in this case, the insulating layer actually fills, following the respective expansion, these recessed zones RZ and, at them, it is in continuous contact with the internal, in use, face 1b of the sheet 1 for all or most (at least 60%, 70%, 80% or 90%) of that face.
If a non-expandable component is used, such as for example wool, if desired mineral or glass wool, this is preferably bonded to the sheet by means of glue.
As will be understood, the configuration of the recessed zones RZ improves the adhesion of the first layer to the sheet 1.
The present invention also relates to a line 5 for processing sheets 1, which line 5 comprises at least a first shaping station 6 arranged to deform the flat sheets 1 so as to form on the latter first fold lines 2 which extend in all or partially orthogonally to the direction of advancement A-A of the sheets 1 in the line 5 and at least a second shaping station 7 arranged to deform the sheets 1 so as to form second fold lines 3, which extend in whole or in part parallel to the direction of advancement A-A of sheets 1 in line 5.
If desired, the sheet or sheets 1 are fed into the line 5 with the width WD perpendicular to the direction of advancement A-A and length LN substantially parallel to the direction of advancement A-A.
In this regard, the first shaping station 6 can comprise at least a first pair of rollers 8, 9 mounted for rotation each around a respective axis of rotation x-x, y-y, a lower roller 8 and an upper roller 9, among which rollers the sheet or sheets 1 can be fed. The rollers 8, 9 are preferably arranged with an axis of rotation x-x, y-y orthogonal to the direction of advancement A-A of the sheets through the first station 5.
Each of the rollers 8, 9 comprises an external shaping surface 8a, 9a that is tubular and knurled or toothed with parallel lines or teeth parallel to the axis x-x, y-y of the respective roller 8, 9, i.e. an external surface 8a, 9a whose distance from the axis of rotation x-x, y-y of the respective roller 8, 9 varies in the passage around the axis x-x, y-y itself of the roller 8, 9. Therefore, the rollers 8, 9 are substantially configured as a toothed wheel.
Preferably, the external surface 8a of the lower roller 8 is configured as the external surface 9a of the upper roller 9 and these surfaces have substantially corresponding dimensions.
Basically, the external surface 8a, 9a of each roller 8, 9 has, in the direction of rotation or passage around the axis x-x, y-y of the respective roller 8, 9, first protruding straight zones 8b, 9b alternating with second recessed straight zones 8c, 9c.
The first straight zones 8b, 9b are actually aligned along a first ideal cylinder, which is at a distance greater from the axis x-x, y-y (or has a diameter greater with respect to the axis), while the second straight zones 8c, 9c are in fact aligned along a second ideal cylinder at a distance shorter from the axis of rotation x-x, y-y (or have a diameter with respect to the axis).
In this case, the first protruding straight areas 8b, 9b and the second recessed straight areas 8c, 9c are parallel to the rotation axis of the respective roller 2, 3.
If desired, the distance of the external surface 8a, 9a of each roller 8, 9 from the axis of rotation x-x, y-y of the same gradually decreases in the passage from each first straight zone 8b, 9b to the adjacent second straight zone 8c, 9c.
In this regard, the teeth of each roller 8, 9 are delimited between two adjacent and successive second recessed straight zones 8c, 9c and comprise the section that extends from a second recessed zone 8c, 9c to a first protruding straight zone 8b, 9b (intermediate between the two second straight zones 8c, 9c) and then from the latter to the other second recessed straight zone 8c, 9c.
Basically, the external surface 8a, 9a of each roller 8, 9, starting from a first straight zone 8b, 9b and moving substantially circumferentially or in any case around the respective axis of rotation x-x, y-y, has a zone of gradual reduction of the distance from the axis x-x, y-y up to a second recessed straight area 8c, 9c, then a zone of gradual increase in the distance from the axis x-x, y-y up to an adjacent first straight area 8b, 9b protruding which is followed by another zone of gradual reduction of the distance from the axis x-x, y-y and then another second zone 8c, 9c recessed straight and so on until returning (once a complete revolution around the axis x-x, y-y has been completed) to the starting first straight zone 8b, 9b.
The two rollers 8 and 9 are positioned one 9 above the other 8 with rotation axes, which are parallel and preferably lying in the same vertical plane, with the top, each time, section of the lower roller 8 in engagement, preferably, without contact with a bottom, each time, section of the upper roller 9 so as to define a first gap or imprint G1 between them for the passage and dragging of the sheets to be shaped.
More specifically, the gap G1 is defined in succession, following the rotation of the rollers 8, 9, first between a protruding zone 8b of the lower roller 8 and a recessed zone 9c of the upper roller 9 in which this protruding zone 8b is partially inserted without contact with the upper roller 9, then by the partial insertion without contact of a protruding zone 9b of the upper roller 9 in a recessed zone 8c of the lower roller 8, then by the partial insertion without contact of another protruding zone 8b of the lower roller 8 in another recessed zone 9c of the upper roller 9 and so on.
Clearly, the two rollers 8 and 9 are positioned or can be positioned so that by making them rotate (for example one motorized and the other idle or driven or, if desired, both motorized), the knurling or the teeth of the external surface 8a engage continuously, preferably without contact the knurling or teeth of the outer surface 9a. More particularly, during the rotation of the rollers 8, 9 a knurling section or one or more upper, in use, teeth of the outer surface 8a of the lower roller 8 is in engagement, preferably without contact, with a knurling section or one or more lower, in use, teeth of the outer surface 9a of the upper roller 9 so as to suitably shape and fold, according to the first fold lines 2, a sheet 1 which is fed between them.
This expedient ensures that a sheet which passes between the two rollers 8, 9 is suitably fold along the first fold lines 2, according to the engagement zones of the external surfaces 8a, 9a.
So far as the expression “non-contact engagement” is concerned, it is understood that during the rotation of the rollers 8, 9, protruding zones at the top of the lower roller 8 are inserted in an area defined by the bottom recessed zones of the upper roller 9 and vice versa, according to a sort of engagement scheme between the edge of toothed wheels, without however there being contact between the external surface 8a of the lower roller 8 and the external surface 9a of the upper roller 9.
Naturally, the expression “engagement without contact” does not refer to the sheets 1, which indeed certainly come into contact with the two rollers 8, 9 and, more particularly with the upper, each time, portion or section of the lower roller 8 and the lower, each time, portion or section of the upper roller 9.
In this regard, the sheet 1 can come into contact with the first protruding straight zones 8b, 9b and the second recessed straight zones 8c, 9c, but not with the sections or portions between them of the surfaces 8a, 9a or at least to an extent minor with the latter.
Clearly, by setting the rollers 8, 9 in rotation, all the different protruding zones 8b and all the second recessed zones 8c are sequentially brought, from time to time to the top of the lower roller 8 and are brought, from time to time, to the bottom of the top roller 9 all the recessed zones 9c and all the protruding zones 9b, so that during the advancement of a sheet 1 in the gap G1 following preferably the rotation of the rollers (in particular by controlling the rotation of the lower roller 8) the various portions of the sheet 1 that are found in a given time interval in the gap G1 will be treated or bent from time to time by the protruding zones 8b of the lower roller 8 and by the recessed zones 9c of the upper roller 9 and/or by the recessed zones 8c of the lower roller and from the protruding zones 9b of the upper roller 9 which define the gap G1 in that time interval.
Preferably, the first gap G1 comprises, although variable as a result of the rotation of the rollers 8, 9, a first straight section G1a and a second straight section G1b inclined with respect to the first straight section G1a. Basically, the first gap G1 can have a substantially V-shaped configuration.
More specifically, the two straight sections G1a, G1b are defined, on the one hand, between two adjacent first protruding zones 8b (with a second recessed zone 8c in the middle) or (depending on the rotation of the roller 8) between two second recessed zones 8c adjacent (with a second protruding zone 8b in the middle) and, on the other side between two adjacent second recessed zones 9c (with a second protruding zone 9b in the middle) or (depending on the rotation of the roller 9) between two first protruding zones 9b adjacent (with a second recessed zone 9c in the middle).
The width of the rollers 8, 9 can be greater or less than the width of the sheets 1 to be treated. In this regard, the sheets 1 could protrude laterally with respect to the rollers 8, 9, so that the sides of the sheets 1 would not be treated or shaped, or the rollers 8, 9 could protrude laterally with respect to the sheets 1, so that the sheets 1 would be treated across their entire width.
Clearly, the rollers 8, 9 could also have an external shaping surface 8a, 9a for the entire extension of their tubular surface or even only for part of it.
Preferably, the distance between the first adjacent and subsequent straight protruding zones 8b, 9b can be slightly greater than the distance between the first fold lines 2 which is to be obtained.
The same can apply to the distance between adjacent and subsequent second recessed straight zones 8c, 9c.
It will be understood that the difference between the maximum height or level of the first protruding zones 8b of the lower roller 8 and the minimum height or level of the first protruding zones 9b of the upper roller 9, also as a function of the feeding height of the sheet 1 in the first station 6, is such as to determine fold lines 2 by means of the first protruding zones 8b and/or the first protruding zones 9b.
Of course, the speed of rotation of the rollers, in particular of the drive roller, as well as the thickness of the sheet are also important.
The first station 6 of course comprises a support base 10 for the rotatable support of the lower roller 8 as well as columns or uprights 11 extending from the support base 10 and designed to rotatably support the upper roller 9.
In this regard, the support base 10 can have two zones defining a cradle or area 12a, 12b for rotatingly support, by means of suitable bearings 13a, 13b of respective tangs or hubs 8d, 9d protruding from respective sides of each roller 8, 9. Clearly, the rollers 8, 9 could each define a through seat where a respective shaft is fitted, which then protrudes from the sides of the rollers, a shaft which is then supported by the base 10.
On the other hand, one of the rollers, for example the lower roller 8, can be driven into rotation by means of a suitable electric motor or other motor, if desired with the interposition of suitable motion transmission means including for example gears, pulleys, belts and/or chains, which roller is designed to drag the sheets 1 at least in advance through the first station 6, while the other roller 9 can be idle supported, so that it is dragged in rotation by the sheet 1, in turn dragged by the lower roller 8. Alternatively, it could be considered to motorize the upper roller 9 or to drag the sheet 1 in a different way, which would determine the advancement of the rollers 8, 9.
In this regard, the lower roller 8 can be keyed or made integral with at least a lower first gear or toothed wheel 14, for example by keying or making the latter integral with the tip of a respective tang 8d of the lower roller 8.
The upper roller 9 can instead be keyed or made integral, for example by means of a special shrink disc 15, to at least a second gear or toothed wheel 16, in which the tip of a respective tang 9d of the upper roller 9 is mounted and then keyed or made integral.
The first station 6 can then be provided with means for lifting/lowering 17 of the upper roller 9 or of the lower roller 8, for example one or a pair of pneumatic, hydraulic or electric actuators 17a, which can be supported by respective support structures, for example rising from the base 10. In this regard, according to the non-limiting embodiment illustrated in the figures, two actuators 17a can be provided, each designed to lift a respective tang or hub 9d of the upper roller 9.
Clearly, the lifting/lowering means 17 may be necessary both during the assembly of the first station 6, and for its maintenance or even to adjust the distance between the rollers 8, 9 according to the thickness of the sheets 1 to be treated.
Advantageously, the first shaping station 6 also comprises means for eliminating or reducing 18 the play between the lower 8 and upper 9 rollers, in particular between the respective external shaping surfaces 8a, 9a.
In accordance with the specific embodiment illustrated in the figures, the means for eliminating or reducing 18 the play correspond to an auxiliary half gear or toothed wheel 18 which is fixed on a second gear or toothed wheel 16 so that the respective circumferential recesses and teeth 18a, 16a are slightly offset.
With reference to this aspect, a second gear or toothed wheel 16 has an annular body with circumferential teeth and recesses 16a, while the auxiliary half-gear 18 has a tubular body with an external diameter equal to that of the second gear or toothed wheel 16 and with circumferential teeth and recesses 18a at the same distance from the respective axis with respect to the teeth and recesses 16a of the second gear or toothed wheel 16.
On the other hand, the auxiliary half-gear 18 is mounted or fixed in abutment to the second gear or toothed wheel 16 so that respective side walls are abutting, with the respective axial openings aligned, but with the circumferential teeth and recesses 18a of the auxiliary half-gear 18 slightly offset with respect to the circumferential teeth and recesses 16a of the second gear or toothed wheel 16.
As it will be understood, this expedient would reduce the free space for the engagement of the recesses or teeth of a first gear 14, so that the play between the lower 8 and upper 9 rollers would be limited.
If desired, the second gear or toothed wheel 16 could also comprise a first section 16b defining recesses or teeth and a second outer section 16c with a smaller diameter without recesses or teeth and on which the auxiliary half-gear 18 can be mounted, which would define clearly an axial opening having an width corresponding to the external bulk of the second section 16c. One could clearly have a reverse configuration whereby the second gear 16 is mounted on the auxiliary half gear 18.
Moreover, in the second gear 16 two, three, four or more holes 19 could be delimited, for example threaded holes, while in the auxiliary half-gear 18 two, three, four or more slots 20 could be delimited, which, in use, are aligned each to a respective hole 19, then providing for the insertion of screws or pins for tightening and fixing the second gear 16 to the auxiliary half-gear 18.
As regards the second shaping station 7, it can comprise at least a second pair of rotating rollers 21, 22 each around a respective axis of rotation z-z, w-w, a lower one 21 and an upper one 22 between which the sheets can be fed. 1. The rollers 21, 22 are preferably arranged with an axis of rotation z-z, w-w orthogonal to the direction of advancement A-A of the sheets through the second station 6.
Clearly, these rollers 21, 22 could also be supported as described with reference to the rollers 8, 9 of the first station 6, also if desired with equivalent play elimination or reduction means.
Each of these rollers 21, 22 comprises an external shaping surface 21a, 22a tubular and knurled or toothed with knurls or teeth configured as circumferences coaxial to the axis z-z, w-w of the respective roller 21, 22. That is to say that the rollers 21, 22 have an external surface 21a, 22a whose distance from the axis z-z, w-w of the respective roller 21, 22 varies in the passage from one side of the roller to the other.
The side of the roller 21, 22 clearly means one of the two end parts of the respective tubular or cylindrical surface. According to the non-limiting embodiment example in the figures, the sides of the rollers are those from which respective tangs 21d, 22d protrude or a respective shaft protrudes.
Preferably, the external surface 21a of the lower roller 21 is substantially configured as the external surface 22a of the upper roller 22 and these surfaces have substantially corresponding dimensions.
Basically, the external surface 21a, 22a of each roller 21, 22 has, in the passage from one side to the other of the roller itself, protruding third zones 21b, 22b alternating with recessed fourth zones 21c, 22c.
The third zones 21b, 22b are in fact aligned along a third ideal cylinder which is at a distance greater from the respective axis z-z, w-w (or has a diameter greater with respect to the axis), while the fourth zones 21c, 22c are in fact aligned along an ideal fourth cylinder at a distance shorter from the axis of rotation z-z, w-w (or have a smaller diameter with respect to the axis). It will be noted that the third zones 21c, 22c and the fourth zones 21c, 22c are substantially circular or cylindrical or annular and coaxial to the axis of rotation z-z, w-w of the respective roller 21, 22.
If desired, the distance of the external surface 21a, 22a of each roller 21, 22 from the axis of rotation z-z, w-w of the same gradually decreases in the passage from each third zone 21b, 22b to the adjacent fourth straight zone 21b, 22c.
Basically, the external surface 21a, 22a of each roller 21, 22, starting from a third protruding zone 21b, 22b at one side of the respective roller and moving axially towards the other side, has a zone of gradual reduction of the distance from the z-z, w-w axis up to a fourth recessed zone 21c, 22c, then a zone of gradual increase in the distance from the axis z-z, w-w up to an adjacent third protruding zone 21b, 22b which will be followed by another zone of gradual reduction of the distance from the axis z-z, w-w and then another fourth zone in recess 21c, 22c and so on until reaching the other side of the roller 21, 22.
The two rollers 21 and 22 are positioned one 22 above the other with axes of rotation z-z, w-w parallel and preferably lying in the same vertical plane, with the top, each time, section of the lower roller 21 in engagement, preferably, without contact with a bottom, from time to time, section of the upper roller 22 so as to define a second gap or imprint G2 between them for the passage and dragging of the sheets to be shaped.
Clearly, the two rollers 21 and 22 are positioned or can be positioned so that by making them rotate (for example one motorized and the other idle or driven or, if desired, both motorized), the knurling or the teeth of the external surface 21a engage continuously, preferably without contact the knurling or teeth of the outer surface 22a. More specifically, during the rotation of the rollers 21, 22, an upper, in use, section of knurling of the outer surface 21a of the lower roller 21 is engaged, preferably without contact, with a lower, in use, knurling section of the external surface 22a of the upper roller 21 so as to suitably shape and fold a sheet which is fed between them.
With regard to the expression “engagement without contact”, by the same it is meant that during rotation, each protruding zone of a lower roller 21 is inserted in an area defined by the bottom recessed zones of the upper roller 22 and vice versa, according to a sort of engagement scheme between the edge of toothed wheels, without however there being contact between the external surface 21a of the lower roller 21 and the external surface 22a of the upper roller 22.
Of course, also in this case the expression “engagement without contact” does not refer to the sheets 1, which indeed during the course certainly come into contact with the two rollers 21, 22 and, more particularly with the upper from time to time portion or section of the lower roller 21 and the lower from time to time portion or section of the upper roller 22.
Clearly, by setting the rollers 21, 22 in rotation, all the circumferential sections of the protruding zones 21b and of the second recessed zones 21c are brought each time to the top of the lower roller 21 in a sequential manner and are brought each time to the bottom of the upper roller 22 all the circumferential sections of the recessed zones 22c and of the protruding zones 22b, so that during the advancement of a sheet 1 in the gap G2 preferably following the rotation of the rollers (in particular by controlling the rotation of the lower roller 21) the various portions of the sheet 1 that are found in a given time interval in the gap G2 will be treated or fold from time to time by the sections of the protruding zones 21b of the lower roller 21 and of the recessed zones 22c of the upper roller 22 and from the sections of the recessed zones 21c of the lower roller and of the protruding zones 22b of the upper roller 22 which define the gap G2 in that time interval.
The gap G2 clearly has a width slightly greater than the thickness of the sheet 1.
Preferably, the second gap G2 comprises a sequence of substantially V-shaped sections from one side to the other, therefore with alternating concavity upwards and concavity downwards.
It will be understood how the difference between the maximum height or level of the third protruding zones 21b of the lower roller 21 and the minimum height or level of the third protruding zones 22b of the upper roller 22, also as a function of the feeding height of the sheet 1 in the second station 7, is such as to determine fold lines 3 by means of the third protruding zones 21b and/or the third protruding zones 22b.
Of course, the speed of rotation of the rollers, in particular of the drive roller, as well as the thickness of the sheet are also important.
The width of the rollers 21, 22 can be greater or less than the width of the sheets 1 to be treated.
Clearly, the rollers 21, 22 could also have an external shaping surface 21a, 22a for the entire extension of their tubular surface or even only for part of it.
Naturally, a line 5 according to the present invention can also comprise other known stations for sheet processing lines, such as sheet cutting stations, if desired downstream of the stations 6 and 7, or side shaping stations 1c, 1d, for example upstream of stations 6 and 7 or other suitable stations, such as those of constraint or application of a first layer to the sheet.
The line 5 can then be equipped with an electronic control unit, as well as a user interface and other standard components for sheet processing lines.
A subject-matter of the present patent right is also a method for working sheet 1, in particular by means of a line 5 according to the present invention.
This method first foresees to prepare at least one starting sheet to be treated, for example substantially flat FS at least at a main part of its extension (the sides 1c, 1d could also have been previously shaped and thus not flat) and then to pass said sheet in the first shaping station 6 or better between the respective rollers 8, 9 so as to fold the starting sheet FS and form on it first fold lines 2 which extend orthogonally to the direction of advancement A-A of the sheets in line 5, thereby obtaining a partially folded or shaped sheet.
As regards this step in detail, preferably, but not necessarily, the sheet 1 is fed between the rollers 8, 9 at a height or level substantially equal to the maximum height or level of the first protruding straight zones 8b of the lower roller 8, with the first protruding zones 9b of the upper roller 9 having a minimum height or level suitably lower than this maximum height or level and the height or feeding level of the sheet (or rather of the main extension of the sheet) in the first station 6.
Thanks to this expedient, the first fold lines 2 are in fact formed by the engagement of the sheet 1 by the first protruding straight zones 9b of the upper roller 9. In this regard, as will be understood a first protruding straight zone 8b of the lower roller 8 reaches its maximum height or level once the lower roller 8 is rotated so as to bring it to the highest point of the latter.
Alternatively, in this step the sheet 1 is fed between the rollers 8, 9 at a height or level substantially equal to the minimum height or level of the first protruding straight zones 9b of the upper roller 9, with the first protruding zones 8b of the roller lower 8 having a maximum height or level suitably higher than this minimum height or level and the height or feeding level of the sheet (or better of the main extension of the sheet) in the first station 6.
Subsequently, the partially folded or shaped sheet, i.e. with the first fold lines 2, is made to pass into the second shaping station 7 or better between respective rollers 21, 22 so as to further fold such sheet and form second fold lines 3 on it, which extend parallel to the direction of advancement A-A of the sheets 1 in the line 5, thereby obtaining a sheet 1 according to the present invention.
As regards this step in detail, preferably, but not necessarily, the sheet 1 is fed between the rollers 21, 22 at a height or level substantially equal to the minimum height or level of the third protruding zones 22b of the upper roller 22, with the third protruding zones 21b of the lower roller 21 having a maximum height or level suitably higher than this minimum height or level and the feeding height or level of the sheet (or better than the main extension of the sheet). Thanks to this arrangement, the second fold lines 3 are actually formed mainly by the engagement of the sheet 1 by the third protruding zones 21b of the lower roller 21.
Alternatively, in this step the sheet 1 is fed between the rollers 21, 22 at a height or level substantially equal to the maximum height or level of the third protruding zones 21b of the lower roller 21, with the third protruding zones 22b of the upper roller 22 having a minimum height or level suitably lower than this maximum height or level and the feeding height or level of the sheet (or rather the main extension of the sheet). Thanks to this arrangement, the second fold lines 3 are actually formed mainly by the engagement of the sheet 1 by the third protruding zones 22b of the upper roller 22.
As a result of the folding along the fold lines 2, 3, in the sheet parts 4 defined between two first adjacent and subsequent fold lines 2 and between two adjacent and subsequent second fold lines 3, a substantially pyramidal or polygon mesh-shaped configuration can be formed or determined, for example with vertex or vertex zone 4a substantially in the center of the respective sheet part 4.
In this regard, according to the non-limiting embodiment illustrated in the figures, by imparting to the sheet 4 fold lines or ribs 2 and 3, fold sections are practically automatically formed on the sheet 1, for example the fold sections 4b, 4c, 4d, 4e.
Subsequently, it is also possible to provide, upstream or downstream of the stations 6 and 7, a station for applying a first insulating layer on the thus obtained sheets 1 and/or a station for cutting and/or shaping the sides 1c, 1d.
In this regard, the step of applying the insulating layer can be carried out by pouring or applying polyurethane or other expandable component in the liquid state on one face of the sheets and then determining the expansion of the polyurethane or expandable component or leaving the polyurethane or expandable component to expand close to the sheet.
Alternatively, the first insulating layer can be made separately and then applied and adhered to the previously formed sheets 1.
As regards one or more cutting stations, advantageously a single sheet is fed into the line, which is then cut downstream of the stations 6 and 7 so as to obtain a plurality of sheet pieces in the same plant or even in a different plant. According to a less preferred variant, pre-cut sheet pieces are fed to the stations 6 and 7.
Naturally, a method for obtaining a sheet according to the present invention could also be carried out differently, for example manually or with stations provided with blades or in another suitable way.
It will be understood how thanks to the present invention it is possible to obtain sheets 1 with a particular finish with a series of fold lines or micro-ribs.
It has been appreciated that such a structure improves the mechanical performance of the sheets following folding or micro-ribbing.
In this regard, this structure improves, among other things, the adhesion of any layer of insulation, for example made of polyurethane foam or mineral wool.
Moreover, a sheet according to the present invention is also aesthetically pleasing, having a substantially diamond-coated configuration.
Changes and variants of the invention are possible within the scope defined by the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102021000010271 | Apr 2021 | IT | national |
