Some tips for wrapping bales:
Handle the plastic with care. Throwing rolls around will damage the plastic, making it impossible for the wrap to unroll properly.
In hot weather, keep the roll boxed and in a shaded area until needed. This will limit excess tack coming out of the plastic. Film that is very tacky will cause tack build up on the stretch unit rollers, and result in the film ‘necking down’
Keep the rollers clean. Some tack will stick to the rollers whatever steps are taken, so make sure that they are cleaned using a white spirit between roll changes when the weather is hot. Dirty rollers will affect stretch percentage, and cause too much neck-down on the bale.
To measure that the correct amount of stretch is being achieved, mark or tape 2 points horizontally 10 inches apart on the roll after pulling the wrap through the pre-stretcher. Measure the distance once the wrap has been applied to the bale. For conventional film such as Silawrap, 55% stretch would mean a reading of 15.5 inches and 60% would mean a reading of 16 inches.
To check neck-down, the width of wrap on the bale should be 580mm to 610mm for 750mm ( 30 inch) wrap, and 380 to 410mm for 500mm (20 inch) wrap.
Always wrap bales within 2 hours of baling.
If wrapping in the field, move bales to the stack straight after wrapping.
Follow the bale wrapper manufacturer’s recommendations for setting up the machine.
On single bale wrappers, make sure that the centre of the bale and centre of the roll of film are horizontal. Take into account different bale sizes and adjust the height of the psu accordingly.
To ensure that 6 layers of film are applied, count the number of revolutions it takes to completely cover the bale once. Add one more and repeat twice.
So, if it takes 7 revolutions to cover the bale once, add 1 (= 8) and multiply by 3. Therefore, 24 revolutions are needed to apply six layers of film.
On in-line wrappers, the number of layers applied is adjusted by altering the number of inches the bale is moved forward per revolution of the hoop. To apply 6 layers on an inline wrapper (with 2 pre-stretchers) using a 30 inch (750mm) roll of film, adjust to a 5-inch movement. (30inches divided by 6 layers).
Handle the plastic with care. Throwing rolls around will damage the plastic, making it impossible for the wrap to unroll properly.
In hot weather, keep the roll boxed and in a shaded area until needed. This will limit excess tack coming out of the plastic. Film that is very tacky will cause tack build up on the stretch unit rollers, and result in the film ‘necking down’
Keep the rollers clean. Some tack will stick to the rollers whatever steps are taken, so make sure that they are cleaned using a white spirit between roll changes when the weather is hot. Dirty rollers will affect stretch percentage, and cause too much neck-down on the bale.
To measure that the correct amount of stretch is being achieved, mark or tape 2 points horizontally 10 inches apart on the roll after pulling the wrap through the pre-stretcher. Measure the distance once the wrap has been applied to the bale. For conventional film such as Silawrap, 55% stretch would mean a reading of 15.5 inches and 60% would mean a reading of 16 inches.
To check neck-down, the width of wrap on the bale should be 580mm to 610mm for 750mm ( 30 inch) wrap, and 380 to 410mm for 500mm (20 inch) wrap.
Always wrap bales within 2 hours of baling.
If wrapping in the field, move bales to the stack straight after wrapping.
Follow the bale wrapper manufacturer’s recommendations for setting up the machine.
On single bale wrappers, make sure that the centre of the bale and centre of the roll of film are horizontal. Take into account different bale sizes and adjust the height of the psu accordingly.
To ensure that 6 layers of film are applied, count the number of revolutions it takes to completely cover the bale once. Add one more and repeat twice.
So, if it takes 7 revolutions to cover the bale once, add 1 (= 8) and multiply by 3. Therefore, 24 revolutions are needed to apply six layers of film.
On in-line wrappers, the number of layers applied is adjusted by altering the number of inches the bale is moved forward per revolution of the hoop. To apply 6 layers on an inline wrapper (with 2 pre-stretchers) using a 30 inch (750mm) roll of film, adjust to a 5-inch movement. (30inches divided by 6 layers).
My son and I were discussing the other day about how the 'new' netwrap doesn't seem to go over the edges as well as decades back. We tried enjoying with the braking mechanism stress, seemed to help a little.
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