A paper defect of coated groundwood-pulp papers generated during heatset drying. Groundwood pulps (unlike most chemical pulps) frequently contain bundles of fiber resulting from incomplete grinding of the logs during pulping. During heatset drying, the heat from the dryer explodes these fiber bundles, producing a rough, abrasive surface on the paper. Fiber puffing can be reduced by reducing the temperature of the dryer. (See also Blister.)
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