CPC Definition - Subclass D21G
This place covers:
Calenders, smoothing apparatus.
Rolls for calenders, controlled deflection rolls, doctors, safety devices for paper machinery, damping devices, paper making control systems, devices for threading web tails through a paper machine.
Coating devices in combination with calenders or other sections in a paper machine.
Attention is drawn to the following places, which may be of interest for search:
Rolls for rolling metal | |
Registering, tensioning, smoothing or guiding webs | |
Methods and devices for coating paper webs in general | |
Rolls in general |
Subgroups and head groups.
If a document concerns embodiments which are covered by several subgroups dependent on a higher hierarchy group, the following rules apply:
the specific technical information relevant for some of the subgroups is classified in all said subgroups;
if relevant, the structural association (e.g. the combination) of the elements covered by the subgroups is classified in the head group;
analogously, if generic technical information common to all of the subgroups is disclosed and only schematic embodiments of the specific subgroup embodiments are represented, the documents is classified in the head group only.
In this place, the following terms or expressions are used with the meaning indicated:
Section | portion of a paper production machine effecting a certain process step, for example forming, pressing, drying, calendering, coating, ...; |
Doctor | device or cleaning the surface of a band, cylinder or roll or for metering a coating substance on the surface of a web |
This place covers:
Doctor devices for paper machines in general.
Attention is drawn to the following places, which may be of interest for search:
Application blades in general | |
Doctors for crêping | |
Doctors for printing machines | |
Doctors for coaters |
This place covers:
Damping devices for paper machines, i.e. devices for applying moisture in form of water or steam.
This place does not cover:
Web conditioning devices arranged in calenders | |
Damping devices for printing machines | |
Steam blow boxes arranged in the paper machine |
This place covers:
Devices that can be used e.g. for controlling or measuring parameters, not essential for the technical functioning of the machine; Control systems and methods; Coating devices in combination with paper machine sections;
Attention is drawn to the following places, which may be of interest for search:
Sensor rolls | |
Fault detection | |
Measuring paper sheets |
This place covers:
Coating processes using two rolls rotating at different speed.
Complete papermaking machines (i.e. at least two sections in combination) comprising a coating section in combination with other paper machine sections, e.g. calendering or drying section.
Attention is drawn to the following places, which may be of interest for search:
Apparatus for coating paper webs in general |