1. CPC Sections
  2. CPC Section D
  3. CPC Class D21
  4. CPC Subclass D21G
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CPC
COOPERATIVE PATENT CLASSIFICATION
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D21G
CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H) [2018-08]
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
D21G 1/00
Calenders (if restricted to the treatment of particular materials see the relevant class, e.g. B29C 43/24, D06); Smoothing apparatus [2013-01]
D21G 1/0006
.
{Driving arrangements} [2013-01]
D21G 1/0013
. .
{for controlled deflection rolls} [2013-01]
D21G 1/002
.
{Opening or closing mechanisms; Regulating the pressure} [2013-01]
D21G 1/0026
. .
{Arrangements for maintaining uniform nip conditions} [2013-01]
D21G 1/0033
. . .
{by offsetting the roll axes horizontally} [2013-01]
D21G 1/004
. .
{Regulating the pressure} [2013-01]
D21G 1/0046
. . .
{depending on the measured properties of the calendered web} [2013-01]
D21G 1/0053
. . .
{using magnetic forces} [2013-01]
D21G 1/006
.
{with extended nips} [2013-01]
D21G 1/0066
.
{using a special calendering belt} [2013-01]
D21G 1/0073
.
{Accessories for calenders} [2013-01]
D21G 1/008
. .
{Vibration-preventing or -eliminating devices} [2013-01]
D21G 1/0086
. .
{Web feeding or guiding devices} [2013-01]
D21G 1/0093
. .
{Web conditioning devices} [2013-01]
D21G 1/02
.
Rolls; Their bearings (in general F16C 13/00) [2013-01]
D21G 1/0206
. .
{Controlled deflection rolls} [2013-01]
D21G 1/0213
. . .
{with deflection compensation means acting between the roller shell and its supporting member} [2013-01]
D21G 1/022
. . . .
{the means using fluid pressure} [2013-01]
D21G 1/0226
. .
{Bearings} [2013-01]
D21G 1/0233
. .
{Soft rolls} [2013-01]
D21G 1/024
. . .
{formed from a plurality of compacted disc elements or from a spirally-wound band} [2013-01]
D21G 1/0246
. .
{Hard rolls} [2013-01]
D21G 1/0253
. .
{Heating or cooling the rolls; Regulating the temperature} [2013-01]
D21G 1/026
. . .
{using the hydraulic fluid in controlled deflection rolls} [2013-01]
D21G 1/0266
. . .
{using a heat-transfer fluid (D21G 1/026 takes precedence)} [2013-01]
D21G 1/0273
. . . .
{on the exterior surface of the rolls} [2013-01]
D21G 1/028
. . .
{using electrical means} [2013-01]
D21G 1/0286
. . .
{Regulating the axial or circumferential temperature profile of the roll} [2013-01]
D21G 1/0293
. .
{Provisions or constructions to facilitate the removal of the rolls} [2013-01]
D21G 3/00
Doctors [2013-01]
D21G 3/005
.
{Doctor knifes} [2013-01]
D21G 3/02
.
for calenders [2013-01]
D21G 3/04
.
for drying cylinders [2013-01]
D21G 5/00
Safety devices [2013-01]
D21G 5/005
.
{for calenders} [2013-01]
D21G 7/00
Damping devices [2013-01]
D21G 9/00
Other accessories for paper-making machines [2013-01]
D21G 9/0009
.
{Paper-making control systems} [2013-01]
D21G 9/0018
. .
{controlling the stock preparation} [2013-01]
D21G 9/0027
. .
{controlling the forming section} [2013-01]
D21G 9/0036
. .
{controlling the press or drying section} [2013-01]
D21G 9/0045
. .
{controlling the calendering or finishing} [2013-01]
D21G 9/0054
. .
{details of algorithms or programs} [2013-01]
D21G 9/0063
.
{Devices for threading a web tail through a paper-making machine} [2013-01]
D21G 9/0072
. .
{using at least one rope} [2013-01]
D21G 9/0081
.
{Apparatus for removing samples from travelling web material} [2013-01]
D21G 9/009
.
{Apparatus for glaze-coating paper webs} [2013-01]