Patent classifications
D
TEXTILES; PAPER
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D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
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D21B
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
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1/00
Fibrous raw materials or their mechanical treatment
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D21B1/04
by dividing raw materials into small particles, e.g. fibres
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D21B1/12
by wet methods, by the use of steam
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D21B1/30
Defibrating by other means
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D21B1/36
Explosive disintegration by sudden pressure reduction
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