Case study
Agricultural covers
THE PROJECT
For a Dutch costumer specialized in the production of very large agricultural covers in polyethylene we developed a full-automatic multiple-roll welding station with hot air technology. The machine had to create sheets of infinite lengths with overlaps and left and right pockets with rope insertion.
Fabric came from 2 extremely heavy bobbins with width up to 2,9 m. Off-cut material needed to be rewound so that it could be used again on the same machine. The customer also requested to develop a rewinder for the extremely heavy finished products, a job made even more challenging by the rope insertions on either side of the sheets.
THE PROCESS
We built a heavy duty unwinding and welding station. The core of the machine was the heat-resistant vacuumed conveyor belt that keeps the fabric under continuous control during the welding cycles. The polyethylene sheets are pulled also by 2 motorized unwinding systems with digital fabric tension control and edge control: automatic and continuous monitoring and correction of the position of the fabric during the feeding with a precision of millimeters.
A range of specifically designed heavy duty hot air welding heads allow for the creation of extremely strong seams. The finished product, extremely long sheets with left and right pockets with rope, were then rewound into heavy but manageable bobbins by a specifically designed, heavy duty rewinding station.
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