Multi-ply (for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00)

Full Title

Special paper not otherwise provided for, e.g. made by multi-step processes > Multi-ply (for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00)

Child Classifications

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• D21H 27/32 with materials applied between the sheets (attaching together paper or cardboard sheets B31F5/00; adhesives C09J)
• D21H 27/38 at least one of the sheets having a fibrous composition differing from that of other sheets
• D21H 27/40 at least one of the sheets being non-planar, e.g. crêped (crêping or corrugating paper B31F)
• D21H 27/42 comprising dry-laid paper