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The four roll bending process

1. Plate alignment and squaring positively against the back roll.

2. Plate pinching (on DAVI, at a pre-set, safe, pressure).

3. Plate is moved as far back as possible between the top and bottom rolls, for the very minimal flat-end.

4. Side roll is moved up, to bend the edge of the plate (pre-bending position).

5. The rolls rotate, to feed the plate, to round the entire leading edge.

6. Inversing the side rolls (down the front roll; up the rear roll).

7. Rotate the rolls, feeding the plate to roll the entire plate length to the required diameter.

8. Pre-bending the trailing edge is an automatic end-of-process feature, continuing feeding the plate forward.

Four roll design



What influences the flat-end of a rolled can? The flat-end (pre-bending) depends almost solely by the load that can be generated on the lower clamping roll.

The length of the flat-end does NOT depend by the side bending roll distance from the clamping spot, or large or narrow geometry of the side bending rolls, compared to the center of the machine (the axis of the two clamping rolls).

The more load that can be applied on the bottom clamping roll, no matter how far the side bending roll would raise to bend the plate, the shorter the flat-end (best pre-bending).

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