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I just visited the FASBA (German SB association) gathering in
Walthershausen where 2 presenters focussed on this subject based on
laboratory testing trying to determine how much pre-tension is required
to avoid creep with unplastered bales. Basically what it boils down to
is that you need 30% pre compression on 100kg/m^3 dry density bales. ie
practically impossible. At the same time though I must clearly state
that the tests being done are very useful and will give us some very
useful data on the behavior of unplastered 2 string and Jumbo bales.
John Zahng of Australia has done similar plastered full wall tests and
found that about 4% pre-compression is required to avoid initial creep.
This figure roughly corresponds to what has been found in practice to
be the right amount of pre-compression. Incidentally the
force-deflection curves presented at the Fasba gathering exhibited the
same flow as those found by John Zahng.
On Aug 22, 2006, at 06:54, Maren Termens wrote:
does somebody know which pressure per area it's needed to compress
Nebraska-walls? Or can you tell me which pressure are you normally
using? I'm looking after essays and tests which work with this item, I
couldn't find technical information about that.
Thanks a lot.
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