Tama Assist Knowledge Twine Main

Twine Spool – shape

Make sure that the spool centre is round, not squashed out of shape. If the centre of the spool is not open and uniform, it can cause the twine to become jammed and not run freely from the spool.
Twine Spool

Twine Spool – care

It is important that the spool is not crushed or out of shape before use. If so, this can upset the internal winding of the twine, allowing the spool to collapse inside and the twine not pulling freely from the spool.
Twine care
Take care of your twine spools, if spools are dropped, crushed or subject to bad handling the twine may not run freely from the spool during use.
Twine care

Twine Spool – size

Spools must be correct size to easily fit in the storage box on the baler, so as not to be damaged when loading. Ensure that spool fits easily into the box.

If the spool is too big, and needs to be forced into the box and become crushed, it could disturb the accurate winding inside the spool and create problems when in use (as shown above).

Twine size

Ensure the spool is not too tall, and can fit easily below the twine guides in the top of the twine box on the baler. If there is insufficient space above the spool, the twine may not be able to pull freely from the spool.
Twine size

Twine Spool – correct alignment

Correct alignment
The spool MUST be used the correct way up, so that the twine pulls from the spool in a Counter-Clockwise direction.
Correct alignment
If the twine is pulled from the wrong end of the spool, it will increase the twist, creating loops that can become trapped on the internal parts of the baler.
Correct alignment
In extreme conditions, over-twisting will eventually cause the twine to knot on itself.

Twine Spool – correct alignment

The Reef Knot, or Square Knot. is quick and easy to tie and provides a good join with a flat profile for ease of movement through the twine guides.
Correct alignment
Tails on spool joining knot (‘X’) should be 15 – 20mm after tightening
!
WARNING

On Double-knotter balers, it is important NOT to join different types/thickness of twine on same knotter
Ensure that the Upper and Lower twines are of the same type and diameter, to avoid any risk of knotting problems caused by twine slipping and knots opening.
warning

BALER CHECK

Twine box
Ensure the spools are correctly connected and routed through the baler to the knotter.

Check that the twine spools are connected in the correct order, as per the baler manufacturer’s recommendation.
twine box

Twine tension settings
In order that a correct and secure knot is made, it is essential that twine tension is correct and all tension devices are adjusted correctly to achieve this.

Tension plates
Ensure the twine tension plates are adjusted correctly, as per operator manual

tension plates

Adjust the twine tensioners at the twine box with slight tension to prevent twine free falling.

Ensure twine tension plates are kept clean and free from crop debris, which if allowed to build up between the plates,
can reduce the twine tension.

Tension rollers
Pull the twine (3) from inside the chamber, with a spring-balance
Adjust the springs (1) on the tension rollers (2) to give a pull-tension of 6 – 8kg

Upper twine tensioner

tension rolls

Lower twine tensioner

tension rolls

Twine guides
Check carefully, and regularly, the twine guide rings below the baler, between the twine boxes and the needles.
twine guide

Worn or damaged guides can damage the twine, breaking fibres and reducing the twine strength.

Knotters

Knotters
Ensure knotters are free from dust and crop residue, which can interfere with knotting process

Needles

Needles
Ensure the needle wheels are free turning and are correctly aligned with the bill-hook and that twine is not outside the needle wheels

TWINE GENERAL KNOWLEDGE

In all spools of Tama Twine, 15m of twine is removed to minimise the effect of deformed twine at the start of each new spool use.

When under the correct tension inside the baler, any wrinkled twine will tighten fully to operate normally in the knotter.

twine genral

Knots
Depending on the OEM make of baler, there are two types of knots made by large-square balers. The knots are quite different and have an impact on the overall ‘strength’ of the twine after the bale is made.

Cormick knot (or ‘Loop’ knot)
All Claas Quadrant and Welger large square balers have knotters which make a Cormiock knot.
cormick knot

Deering knot
All other makes of baler (Single or Double-knot) have Deering knotters, which make a standard knot.
Deering knot

Strength vs Performance
The ‘tensile’ strength of twine, is the strength in Kilogram Force (Kgf) at which a single, un-knotted, length of twine will break.

Once a knot is made in the twine, the overall ‘strength’ of the piece of twine is reduced, depending upon the type of knot that is made.

Because the Cormick and Deering knots are different, the overall twine ‘strength’ at the knot is different.

Cormick knot retains 75% of the twine’s original tensile strength
Deering knot retains only 55% of the twine’s original tensile strength

For example:
Twine with ‘tensile’ strength of 350 Kgf

  • overall strength at the knot when made using a Cormick knot = 245 Kgf
  • overall strength at the knot when made using a Deering knot = 192 Kgf

The same twine is 22% ‘weaker’ at the knot on the Deering knotter.

Comparing twine quality using the reference value of ‘knot strength’ of the twine is not accurate.

Without knowing which type of baler the twine will be used on (so knowing the retained strength of the twine after knotting), it is wrong to use ‘knot strength’ as a reference of security of the twine to hold the bale.

Most twine failures on a bale are a result of the knot opening after the bale is ejected from the baler, and NOT as a result of the twine breaking.

This is because many ‘old technology’ twine producers make twine heavier per metre, so making it thicker. Thicker twine is less able to make a stable knot, tightly formed with long tails, which increases the risk of the knot opening after the bale is released by the baler.

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