The Blind Drill Press Roll is also coated with rubber or polyurethane on the iron roll core. Blind holes with a diameter of 2 mm and a depth of 12 to 15 mm are drilled on the rubberized surface. It is also possible to drill blind holes with different depths and two rows alternately. The opening rate of the blind hole pressing roller is about 25% to 30%, and its eye hole volume is about 5 times larger than that of the grooved pressing roller, so it can accommodate more Squeeze water. The solid part of the blind hole pressure roller is not as easy to damage as the grooved pressure roller, so the roller can be covered with a soft rubber layer, about 70-90 Shore hardness. As a result, first, it can reduce the wear of the felt, and second, it can provide a wider nip, which is beneficial to increase the line pressure of the nip. Compared with a grooved roller with a depth of 15 mm and a groove depth of 2.5 mm, it can be ground many times longer than a grooved roller before re-gluing.
Feature
1. Simple structure, easy processing 2. Large surface porosity, usually 30% (grooved roller 17%, vacuum roller 15% 25%), which is conducive to a large amount of dehydration 3. The total volume of the blind holes is usually twice the total volume of the grooves of the grooved press roller, which can accommodate a large amount of water pressed from the paper and can be effectively discharged, with a large dewatering capacity and high efficiency.
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