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Hat-plank′ing.

A finishing felting operation. See felting.

The hat-body being basoned or hardened is passed through a cistern containing a heated acidulated water with dregs of beer, or other planking liquor, and between two series of pressing rollers, by which the fibers are knitted together or consolidated into felt, when they are ready for the blocking.

In hat-planking machines the bodies are repeatedly passed through a boiling acidulated bath and under pressure, being frequently crazed. See also hat-body sizing-machine.

Crozing or crosing is refolding a hat-body so that in passing many times through a felting-machine it may present new surfaces to be acted upon.

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