Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A type of REFINER consisting of a conical plug which fits into a matching conical shell. The outside of the plug and the inner surface of the shell are fitted with knives or bars. The plug is pushed into the shell to the point where the knives or bars of each are almost touching. When fibrous stock in solution enters the shell, usually at its smaller end, the knives or bars of the rotating plug and stationary shell mascerate the fibrous material and help reduce it further. (17 )

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