D21FLevel 3
PAPER-MAKING MACHINES
**Definition:** This place covers:
Methods and devices in the wet end, press section and drying section of a papermaking machine, embossing paper, forming discontinuous sheets of paper.
**Limiting references (this place does not cover):** - Calendering paper webs -> D21G - Coating paper webs -> D21H
**Glossary:** - Section: portion of a paper production machine effecting a certain process step, for example forming, pressing, drying, calendering, coating, etc. - Yankee: steam heated drying cylinder of large diameter, mainly used for the production of creped tissue paper - TAD: through air drying process, drying paper webs by passing streams of air therethrough
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