Stock material or miscellaneous articles – Sheet including cover or casing – Noninterengaged fibered material encased
Patent
1995-12-27
1998-06-30
Loney, Donald
Stock material or miscellaneous articles
Sheet including cover or casing
Noninterengaged fibered material encased
428114, 428167, 428172, 428174, 428178, 428182, 156 60, 156210, 264257, 425397, B32B 104, B31B 160
Patent
active
057731179
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a deep ribbed sandwich panel and a method for its manufacture.
Sandwich panels are known consisting of two profiled metal sheets between which a layer of insulating material, preferably polyurethane foam, is interposed.
A method for the continuous manufacture of said panels is known by which two sheet metal webs are passed through suitable shaping machines which give them their required shape, in particular by forming longitudinal stiffening ribs which in some cases have a height comparable with the overall thickness of the panel (deep ribbed panel). The webs are advanced in such a manner as to be maintained at a distance apart corresponding to the thickness of the panel to be formed, and a plastics material such as polyurethane foam is fed between these so that on expanding it forms the insulating layer of the panel. When the plastics expansion process has ended, the continuous panel hence formed is passed through a cutting station in which it is reduced to finished panels of the required length.
These known panels have however the drawback of poor flame resistance due to the presence of the foamed material.
To obviate this drawback it has been proposed to form sandwich panels in which the internal layer of insulating material consists of a plurality of side-by-side coplanar strips of mineral fibre with their longitudinal axis perpendicular to the longitudinal axis of the panel and with the fibre axis perpendicular to the metal sheets.
In the case of deep ribs the problem of rib filling exists because the mineral fibres cannot be injected, whereas the more simple solution of not in fact filling the ribs has certain drawbacks, including: case of fire, handling difficulties during installation, condensate formation.
To overcome these drawbacks it has been proposed to fill the rib cavities with a plastic insulating material such as polyurethane.
Such a panel has however the drawback, in the case of fire, of different behaviour between the non-combustible mineral fibres and the highly combustible polyurethane.
In another known type of panel a mixture of polyurethane and mineral fibres is injected into the deep ribs.
However, although to a lesser extent, this type of panel also has the drawback of possibility of combustion because of the polyurethane present.
An object of the invention is to obviate these drawbacks by providing a deep ribbed sandwich panel in which the entire filling consists of mineral fibres.
A further object of the invention is to provide a method enabling a panel to be manufactured continuously and automatically.
These and further objects which will be apparent from the ensuing description are attained according to the invention by a sandwich panel as described.
The invention addresses a deep ribbed sandwich panel, as well as a process and apparatus for making the panel. The panel includes at least one shaped metal sheet having at least one rib thereon and a layer of insulating material wherein the ribs are filled with mineral fiber strips having a cross section complementary to the cross section of the ribs.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is described in detail hereinafter with reference to the accompanying drawings in which:
FIG. 1 is a cross-section through a sandwich panel according to the invention;
FIG. 2 is a schematic view of an apparatus for inserting the strips into the ribs;
FIG. 3 is a side view thereof;
FIG. 4 is a detail of the raising system;
FIG. 5 is a plan view of a further plant for forming the panel;
FIG. 6 is a view thereof on the line VI--VI of FIG. 5;
FIG. 7 is a view thereof on the line VII--VII of FIG. 5;
and
FIG. 8 is a view thereof on the line VIII--VIII of FIG. 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As can be seen from the figures, the sandwich panel according to the invention, indicated overall by 1, is of the deep ribbed type, ie with stiffening ribs of height comparable with the overall panel thickness and consists of two metal sheets 3,4 between which a layer 5 of mineral wool fibres is i
REFERENCES:
patent: 2576698 (1951-11-01), Russum
patent: 3003902 (1961-10-01), McDutt
patent: 3031358 (1962-04-01), Rutter et al.
patent: 3302358 (1967-02-01), Jackson
patent: 3969563 (1976-07-01), Hollis
patent: 4294875 (1981-10-01), Schramm
Loney Donald
Metecno S.P.A.
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