Note: Descriptions are shown in the official language in which they were submitted.
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This invent~on relates to a so-called sandwiched
pane having such a structure as to permit a particularly
advantageous use thereof ln a wide ran~e of fields of
the modern technology.
The invention is also related to a method and a
machinery for makin~ such a panel, which afford rapility
of construction of said panel at a reduced cos-t.
; A general object of the present invention is to
provide a sandwiched panel which, in addi-tion to possess-
i 10 ing the properties oE mechanical resistance which are
necessary for the intended purposes, afEords concurrently
satisfactory properties of thermal and acoustic insula-
tion and an extremely easy processability with machine
tools so as to be subjected without difficulty to quick
~1 15 operation of edge shaping whenever necessary.
To this purpose, according to the present invencion,
it has been envisaged to provide a sandwiched panel which
~s characterized in that it comprises two spaced-apart
outer sheets which enclose a core of an expandecL plastics
material surrounded by a frame~ also of an expanded
pla~qtics material~ havin~ a speci~ic gravity heavier than
that of the core material. Preferably~ but not c~mpul-
i sorily, the sheets can be of a woody material.
~j A metllod which is adapted to the manufact~re on
an l~du~tri-ll scale of the panel reEerled to above compri~
ses the steps oE : delimiting between sa:id external spaced
' apart sheets a Eirst enclosure the peridleter QL wh:ich is
, Ij
r~tracted relative to that of the sheets~ E:illing said
first enclosure with a first escpanded plas-tics material
so as to make up said core~ delimiting between the peri-
pheral surface of the core and the-she0ts ~ second enclo-
sure and fillin~ said second ~nclosure with a second expan-
i ded plastics material so as to form said fr~me.
Further -features, objects and advantages of tlle
invention will become still more apparent from the scrutiny
of the ensuing descrip~ion, aided by the accompanying
drawin~s~ wherein :
FIGURE 1 is a perspecti~e view, partly in cross-
sectio~ showing the panel cvnstrllcted accordin~ to the
invention.
~IGURE 2 is a partial perspective view showing a
basic article from which it i5 possible to start for obtain-
ing the panel shown in FIGURE 1.
FIGURE 3 is a partial perspectivé view showing a
i part of the machinery which can be employed in the ~anu-
i facture of the panel shown in FIGURE 1.
FIGURE 4 is a plan view, partly in cross-section
showing a machinery in the operative condition.
FIGURE 5 is a cross-sectional view, taken alon~ the
line V-V of FIGURE 4, and
~ FIGURE 6 is a cross-sec~ional view akin to that of
¦~ FIGURL` 4, but showing the machinery in another operative
i 20 position.
In FIGURE 1 of the drawings, the sandwiched panel
in question is gererally indicated at 10 and is structural-
l ly composed by two sheets ll, parallely spaced part from
;~ one another and preEerably consisting of a woody material
such as that known in the tradz under the name ~Faesite~
~Reg. Trade Mark) The space between the sheets ll is
I ~illed by a core 12~ of an expanded plas(ics material of
:j , low densi.~y~ whlch is surrounded by a Prame 13 of a second
plastics material ha~i.slg a density hea~iér than that of the
former material. Both the materials can be expanded poly~
~ styrene and also polyurethan or also phonolic resins,
j The panel depicted in FIGURE 1 can be made startin~
j from the article 14 shown in FIGURE 2: that is~ the t~o
sheets ll interconnected by spacers 15 fastened thereto in
posltions which are arrear with respect to the periphery
2.
,
)
of the ~l~eets.
The arti.cle 14 is clamped between the boards 169
17 of a moulding machinery ,shown in FIGURES from 4 to 6~
with the confrontingly placed 'inner surfaces of the sheets
11 spread with an adhesive. Between the sheets 11 it is
possible to slip injection nozz,l.es 18, one for each side
o~' the panel ( FIGURES 3 and 6). Each nozzle 18 can slide
towards and away in the directions shown by the arrows and
has a front 19 ( FIGURE 5 ) the langth of which is about equal
- 10 to that of the respective side of the panel
,., As shown in FIGURE 4, the nozzles 18 are first in~
'` troduced along a certain distance between the sheets ll
.... .
so as to define a firs-t enclosure having a volume equal to
i that o the core 12 a said enclosure being filled with a
~ first expanded material. If the material which is used
~i
- is~ for example~ polystyrene, it can be advaritageously
introduced by nozzles 20 formed through the nozzles 18.
The material is then expanded by introducing into the en-
~ closure a pressurized hot fluid. such as steam through
",~ 20 injectvrs 21 in the nozzles. The expanded material is
firmly united to the internal surfaces of the sheets 11
which had previously been spread with an adhesive as afore-
said. Thus the core 12 of the panel has been provided.
~, At this stage the nozzles 18 are brought back to
the posi,tion of FIGURE 6 so as to define between the core
'12 and the nozzles 18 a second enclosure having a volume
! equal to that oP the frame 13. This space is filled, st,ill
~ through the injectors 207 with a second expanded material
',, ''. having a density heavier than that oE the ~irst material.
'.~' 30 I the material wh.ich is used is polystyrene again~ it is
expanded as in the previous stage by introducing a hot fluid
, through 21.
I Thus the Erame 13 has been formed around ~he core 12
,) and a sandwi.ched panel structure has been formed 10, as
', 35 shown. in FIGU~E 1.
3-
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The panel 10 is removed from the moulding machinery
and sent to further processing, which can be o a nature
which differs according to the :intended final use for the
article~ but after ha~ing stak-lized the latter: s-tabili-
~ation can take place both in-the moulds or in a specially
ptovided ~ontrolled environment.
The panel according to the invention has proven parti-
cularly advantageous for the manufacture of doors by virtue
of its differential internal structure which is composed
by the core 12 and the frame 13, made of a lighter and a
dens~r material~ respectively~
The frame 13 of a denser rnaterial~ in addition to
l impress an adequate stiffness to the structure, can also
; ~- readily and quickly machined to the shape corresponding to
,,! 15 a conventional door ledge~ to be coated subsequently with
' an appropriate material~ such as a veneer.
1 In this connection it can be noted that the nozzles
}l 18 can be shaped with projecticns so as to define~ in the
, side of the frame 13, spaces in which plugs of a hard
material~ such as wood~ are insf3rted firmlyg so as to be
adapted to receive the hinges and the locks for the door.
As an alternative~ such plugs can be embedded in the
ex~anded material by setting them previously in the article
i 14 prior to the injection.
:i 25 It is possible to make the doorposts and the cross
¦ beam of the door frame by injecting an exp~nded plastics
materi.al within a preshaped erame oE wood or another con~
talner mater:ial.
The cnds Oe the posts ancl the cross beam can be dove-
3~ tailed for a stable and quiclc connection of the nnortise and
tenon type by impressing an appropriate shape to the in-
jection nozzles.
The panel accordlng to the invention c~n also be used
with advantage in the manufacture of pieces of furni-ture~
! 35 of van bodies, Oe containers~ of partition walls and like
I 40
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While a possible em~odiment of the invention has
been shown and described herein, it will be ~nderstood
that modifica-tions and changes can be introduced therein
without departing from the scope of *he invention as
defined in the appended claims.
For example~ one or both the outer sheets of the
panel could be shaped as desired consistently with the
final use intended for the pane~
The sheets 11 could also be discre-te (that is the
spacers 15 could be dispensed with). In this case3 they
could be held against the respec-tive boards 16, 17, for
example by suction means or mechanical holding means.
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