Note: Descriptions are shown in the official language in which they were submitted.
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METHOD OF AND ARRANGEMENT FOR .
PRODUCING PRESSED SHAPED BODY ~
AND SEIAPE~ B01:2Y PRODU~E~ THEREBY
1BACK~;ROUND OF THE I~IE~TIO~
The present invention relates to a method of and an
. arrangement for producing a shaped body of a fluid, but non-
swelling mixture of fibers and a heat-hardenable binding medium
by pressing in a pressing tool. The invention also relates to a
shaped body produced by the inventive method and arrangement.
Methods and arrangements o~ the above mentioned general
type are known in the art. One o~ such methods and arrangements
is disclosed in the D~-PS 2,548,739. In accordance with the
known method and arrangement, a plurality of different shaped
members can be produced in great numbers, such a~ covering shaped
members for the manufacture of outer and inner coverings on con-
struction gates, balcony coverings, table plates and the like.
The non-swelling mixture is composed mainly of ligno
cellulose-containing fiber materials, such as comminuted and
dried wooden chips, bagasse fibers and the l~ke, mixed with a
heat-hardenable synthetic resin such as melamine ureaformalde-
hyde resin or phenolformaldehyde resin. Instead of the commi-
nuted and dried wooden or bagasse fibers, also fibers of other .
materials can be used such as glass fibers, stone wool or
asbestos fibers, alone or in a mixture with one another, with
admixture of respective advantageously organic binding agent.
When a shaped body has a design which i~ homogenous and
little structured, it can be pressed in a simple manner in a
pressing tool composed of a lower part and an upper part~ The
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surfaces of the upper part and the lower part which face toward
the volume of the pressing tool receiving the mixture have a
shape corresponding to the shape of the shaped body.
Pressing of the shaped body is performed now so that the
lower part is filled uniformly with a predetermined quantity of
the mixture to a predetermined height. The filling height
amounts to approximately from 2 to 7 times the thickne~s of the
shaped body. When the shaped body to be produced does not have
to be provided wi~h a decorative outer sur~ace, it is pressed in
one working step and hardened by a heat supply. When the shaped
body must be produced with a decorative outer surface, a rough-
pressed member is first produced from the mixture in a fir~t
pressing step, and it is compressed fast to the volume of the
shaped body. This rough-pressed member is removed from the rough
press, inserted in another press together with a decorative surface
coating and finally pres~ed in the latter.
As was mentioned herein above, the utilization of the
above described method is possible only when the shaped body to
be pressed has a little s~ructured shape. It i8 also possibie to
produce the shaped body with a strongly structured shape from the
non-swellmg~mixture. However, it is necessary to have in this
case a pressing tool composed of more than two parts and to apply
required pressure not only in a vertical direction but also in a
horizontal direction.
There are also shaped members which possess a strongly
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1 s uctured shape and can be pressed of a non-swelling mixture.
However, the pressing tool for the production of ~uch articles is
expensive and therefore the articles are costly, or the article is
q~, strongly structured that a multi-partite to~ cannot be used.
Such an object is for example a square or rectangular
grid-like lattice covering which is composed of shaped webs
arranged in a cross-like pattern and merging into one another.
The shaped webs have a strongly structured cross-section having
for example a uniform square, rectangular or trapezoidal base and
one or more webs provided at one side of the base.
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1 5~aBY OF ~ I~Y~IQ~
;'
Accordingly, it is an object of the present invention to
provide a method of and an arrangement for producing a shaped body ,
and a sha~ed bddy produced thereby, which avoid the disadvantages of
the prior art.
More particularly, it is an object of the present inven-
tion to provide a method of and an arrangement for producing
shaped body, which can be used ~or producing shaped bodies having
the above mentioned cross-section.
In keeping with these objects and with others which will
become apparent herein after, one feature of the present inven-
tion resides, briefly stated~ in a method of producing a shaped
body in accordance with which a mixture is filled into a filling
space of a lower part of a pressing tool to a predetermined
filling height in the presence of at least one step which is
arranyed on a ~otbom of the lower part and narrows its filling
space, the mixture is compressed to its end size and simulta-
neously hardened under the action of heat, and then a one-piece
upper part of the pressing tool with a contour corresponding to
the contour of the shaped body is lowered into the lower part of
the pressing tool.
Another fea~ure of the present invention is an
arrangement for producing a shaped body,which has such upper part
and lower part, and at least one step located on a bottom of the
2S lower part and narrowing its filling space.
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1 Finally, still a further feature of the present
i~venS~on- is a shaped body which has at least one web extending
upwardly from an upper region of a base part, wherein a base part
has a ~oid located at the same side in a lower region of the base
part and having a shape corresponding to the shape of the web.
The novel features o~ the present invention which are
considered as characteristic for-the invention are set forth in
particular in the appended claims. The invention itself, how-
ever, both as to its construction and its method of operation,
together with additional objects and advantages thereo~, will be
best understood ~rom the ~ollowing description o~ specific embo-
diments when read in connection with the accompanying drawing~
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1 ~RTEF ~l~iCRIPTION QE ~ ~2Ba~
.' .
Figure 1 is a view schematically showing a cross-section
of an article pressed in accordance with a known method and in a
known arrangement;
S Figure 2 is a view schematically showing a section of a
pressing tool for producing'the article of Figure l;
Figure 3 is a view schematically showing a section of a
pressing tool in accordance with the present invention;
~igure 4 i8 a view sahematlcally showing a section o an
article in accordance with the present invention,produced in the
inventive pressing tool of Figure 3;
Figure 5 is a view showing a longitudinal section of a
grid-like lattice covering produced in accordance with the pre-
sent invention; and
lS Figure 6 is a view showing a fragment of the article of
Figure S.
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1 DESCRIPTIQN ~ PREFERRE~ E~RO~IMENTS
Figure l shows a cross-section oE an article which must
be pressed of a fluid but non-swelling mixture of fibers and a
heat-hardenable binding medium, as simp~y as possibleO The non-
swelling mixture can be composed of lig~o cellulose-containing
fiber materials such as comminuted and dried wood chips, bagasse
fibers and the like, mixed with a heat-hardenable synthetic resin
such as a melamineureaformaldehyde resin or phenolformaldehyde
resin. Ins~ead of the comminuted and dried wooden or bagas~e
fibers, also fibers of other materials can be used such as ~or
example glass fibers, stone wool or asbestos fibers alone or in
mixture with one another, with admixture of respective preferably
organic binding agent.
The above-mentioned cross-section of the article has a
rectangular base l with webs 2 extending upwardly from the upper
surface of the base l at its both sides.
When such an article must be pressed in accoedance with
known methods in an arrangement which has a pressing tool with a
lower part 3 and an upper part 4 as shown in Figure 2, a mixture
2~- to be pressed must fill the lower part of the pressing tool with
a thickness which is from 5 to 7 times the thickness of the
finished article. Figure 2 shows the mixture fil ling 5 which
corresponds to the 5 times the thickness of the finished article~
As can be seen from Figure 2, it is not simple to provide such a
25 fi ing of the lower p-~rt of th ressing tool. This is first of
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1 all difficult when a shaped body must be pressed from the mixture
filling 5 by lowering of the upper 4 of the pressing tool verti-
cally downwardly. In this case parts 6 of the mixture filling
from which the webs 2 must be produced in the shaped body fall
inwardly. As a result of this, in the finished pressed shaped
body, the webs 2 have a low density. They do not contain the
required quantity of the material and their strength i5 insuffi-
cient.
In accordance with the present invention this disad-
vantage is eliminated in the following manner. A shaped body ispressed in a lower part 3' of a pressing tool shown in Figure 3.
The lower part 3' of the pressing tool in accordance with Figure
3 differs from the lower part 3 of the pressing tool in accord-
ance with Figure 2 in that steps 7 are arranged on a bottom of '
the lower part 3' so as to narrow a fil~ing space in this region.
The steps 7 have a construction which is similar to the construc-
tion of the webs 2. When the step 7 is arranged in the lower
part 3'of the pressing tool, the lower part 3 can be filled with
the mixture filling 5 in uniform height,as can be seen from
Figure 3.
This step or the step 7 in the lower part 3' of the
pressing tool act so that a sufficient quantity of the mixture is
maintained in the region of the webs 2 to be pressed, so that the
finished webs 2 possess a sufficient density. This can be
clearly understood from Figure 3 in which an upper end size 10
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1 of the finished shaped body is shown in a bl~ken line.
When the one-piece,~ part 4 of the pressing tool is lowered
and the shaped body is pressed from the mixture filling 5, a
shaped body is formed with the cross-section shown in Figure 4.
; S This shaped body hasg as desired,the pressed out webs 2. How-
ever, its base 1' has two undercuts 8 which do not undesirably
affect the shaped body in any manner. Moreover, the webs 2
possess the same density and mechanical properties as ~he base
1'. The lower sides of the base 1' o~ the shaped body can also
be provided with depressions Eor example channel-like depres-
sions~
Figures 5 and 6 show an example of application of a
shaped body produced in accordance with the present invention.
Figure 5 is a longitudinal section of a half of a g~id-like lat-
tice covering. This grid-like lattice covering is composed of a
plurality of shaped bodies 9 arranged in a cross-like ~anner.
The cross-section of the shaped body 9 has a block-shaped base 1'
and at least one web 2. In the,embodiments shown in Figures 5
and 6, the shaped body has sharp edges. The same shaped body can
~0 also be produced in accordance with the present invention with
rounded edges. As can be seen from Figure 6 also depressions are
provided between the webs 2 and the upper part of the base 1'.
As can be seen from Figures 4 and 6, the shaped bodies
produced in accordance with the present invention differs from
the shaped body produced in accordance with the known methods and
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shown in Figure 1 in that the base 1' has at its sides two voids
with a shape substantially corresponding to the shape of the webs
2.
It will be understood that each of the elements des-
cribed above, or two or more together, may also find a useful
application in other types of co~structions differing from the
types described above.
While the invention has been illustrated and described
as embodied in a method of and an arrangement for producing a
pressed shaped body, and a pressed shaped body produced thereby,
it is not intended to be limited to the details shown, since
various modifications and structural changes may be made without
departing in any way from the spirit of the present invention~
Without further analysis, the foregoing will so fully
reveal the gist of the present invention that others can, by
applying current knowledge, readily adapt it for various applica-
tions without omitting features that, from the standpoint of
prior art, fairly constitute essential characteristics of the
generic or specific aspects of this invention.
What is claimed as new and desired to be protected by
Letters Patent is set forth in the appended claims.
