How should the gap size and rotational speed of the three-roll calender be adjusted?

How should the gap size and rotational speed of the three-roll calender be adjusted?

The thickness of the sheet material is related to the gap size of the three-roll calender. Generally, the spacing between the rolls of the three-roll calender should be adjusted to be equal to or slightly larger than the thickness of the sheet material, and the spacing between the rolls should be adjusted uniformly along the width of the sheet. When the material passes through the gap of the three-roll calender, there should be a certain amount of material stored in the gap; otherwise, when the material output at the machine head is uneven, phenomena such as material shortage and large spots will occur. However, the amount of stored material should not be too much, otherwise, due to the lower temperature of the stored material, "rib-like" stripes will form on the surface of the sheet material. The rotational speed of the rolls of the three-roll calender also directly affects the thickness of the sheet material. The rotational speed of the three-roll calender is generally controlled to be 10% to 20% higher than the extrusion rate of the extruder, which is beneficial to improving the longitudinal tensile strength of the sheet material. The higher the rotational speed of the rolls, the greater the tensile effect on the sheet material, and the smaller the thickness.
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