Posted 16 September 2020 - 02:24 PM
I’ve run a single knot big square baler for 22 years. The limiting factor of a single knotter is not so much twine strength as it is bale density and baler chamber height. Increasing either of those puts more demand on the twine holder than it can take and pretty soon you are getting misties because the twine is pulling out of the holder. The main reason to use a double knot is to quit trying to pull all the twine all the way around the bale while it is being forced through the chamber. In the case of the D1000 we run, the chamber is only 24” tall and we don’t go wild with density. A single knot works fine for that baler. Try to go to a higher density or go to a taller chamber (like the ill fated D2000 or JD 100) and the single knot is a disappointment.
Yes, the single tie knotter is simpler than a double tie knotter. No, it is not nearly as foolproof as the knotters a small square has, even though it is the exact same principle.
One comment about single knotters and twine strength. Whether or not a knotter can handle a stronger twine depends on whether or not the knotter was designed for it. The D1000 has two different twine holder designs. The early serial number machines had a thin lower disc in the twine holder and they do not like 440 twine. 350 is fine. The later SN machines with the thick lower disc work equally well on 350 and 440.