h a l f b a k e r yWhat was the question again?
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Plywood is a laminate material made from several thin
sheets of wood, glued together with the grain at
different angles (typically
alternating by 90 degrees). This makes the board stiff in
both planar axes.
Corrugated cardboard is effectively three layers of kraft
paper- two outer 'liners',
with the central one pleated up
and down to form
'flutes'. This makes it stronger, however it has a
directionality; it is easier to bend and fold along the
flutes.
Double-walled varieties have five layers; flat sheets
alternating with corrugations, and higher multi-wall
options all exist.
So, all multi-walled cardboard I've seen has the flutes in
the same direction. This obviously is sub-optimal for
many purposes,
since there is increased flexibility and creasing in one
orientation.
I suspect this is primarily due to ease of manufacture -
corrugating machines are apparently enormous, and
produce cardboard
at a very high rate. I think that generating longitudinal
pleats in a continuous manner may not be
straightforward.
Nevertheless, even if this is not feasible I believe that a
relatively simple engineering solution may be available.
Corrugated
cardboard with only two layers -one liner, one
corrugated medium ('single face board') is available as an
option at some
manufacturers.
The strategy requires that we run two manufacturing
lines - notionally but probably not literally at right angles
to each other.
One produces single-wall board, while the other
produces single-face board. Potentially these operations
may be performed
sequentially on the same corrugator, and these
intermediates rolled onto reels for storage.
In the final, assembly step, the top layer of the single-
wall is glued to the exposed flutes of the single-face
board at right angles to its own
crenelations. Obviously after this operation the product
will not bend well in either orientation and may have to
be cut into
sheets and stacked for storage rather than rolled up.
JP3150617U
https://patents.goo...atent/JP3150617U/en Cross laminated cardboard board [xaviergisz, May 04 2020]
WO2017179896A1
https://patents.goo...t/WO2017179896A1/en Figure 8 [xaviergisz, May 04 2020]
[link]
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This is a "surely it's a Thing" situation... but a dig around the
internet failed to turn up an existing example. |
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It's certainly known in the cardboard construction world. But
as a manufactured product, I also couldn't find an example. |
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//in the cardboard construction world// - where exactly are
you from [bs0u0155]? |
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"Acoustic Fiberboard" c 1960s- 1980s used this
principle; cross-ply corrugated absorbed sound,
reducing echoes inside speaker enclosures.
AFS/Kriket manufactured it until the early
1980s.
Yes, it's very strong. |
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"Acoustic Fiberboard" c 1960s- 1980s used this
principle; cross-ply corrugated absorbed sound,
reducing echoes inside speaker enclosures.
AFS/Kriket manufactured it until the early
1980s.
Yes, it's very strong. |
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Above: The "Acoustic Fibreboard" seems to cause an echo. |
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Sometimes that is the acoustic effect desired ... |
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////in the cardboard construction world// - where exactly
are you from [bs0u0155]?// |
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Given the amount of deliveries I've had, cardboard has
become an abundant resource. So, I had a look around the
internet and it turns out people use it to build stuff. I had
all the things and spare time, now I own a cardboard cat
cathedral. |
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That sounds like it could be highly entertaining. Is it anything like Notre Dame ? Does it have smoke detectors and sprinkler systems ? |
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[bs0u0155] - That is awesome. And you have finally
validated your cats by building them a temple. |
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It has a circular window, but only a single tower at the other
end. The tower is accessible from inside and with skill, one
cat can climb up inside and emerge on top of the tower,
where occasionally treats are to be found. Like a real
cathedral, it will soon require some roof restoration. Due to
certain leaping down from the tower circumstances. |
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I recommend adding some flying buttresses. And gargoyles. |
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