CPC Definition - Subclass D01D
This place covers:
Mechanical methods and apparatus for the manufacture of artificial fibres and filaments.
Many documents in the field disclose features related to both the mechanical (D01D) and the chemical (D01F) aspects of fibre manufacture. Two cases can be envisaged:
a) When a document is concerned with mechanical aspects but mentions specific polymers, a class should always be given in D01D and a class may be added in D01F when the chemical aspects are relevant or non-usual polymers or additives are used. No D01F class should be given when a long list of polymers is mentioned, even in the claims.
b) When a document is concerned with chemical aspects but mentions specific techniques (e.g. melt-blowing, electrospinning) a class should always be given in D01F and a class may be added in D01D when the specific technique plays an important role. No D01D class should be given when several unrelated techniques are mentioned, even in the claims.
This place does not cover:
Working or processing of metal wire | |
Production of metallic filaments | |
Production of glass fibres | |
Production of ceramic fibres | |
Apparatus specially adapted for the manufacture of carbon filaments are classified | |
Processes starting from pre-made fibres or filaments, such as the production of yarns from single filaments |
Attention is drawn to the following places, which may be of interest for search:
Shaping foodstuffs by extruding | |
Synthetic grass (lawns for playground or sports grounds: E01C 13/08) | |
Artificial hair | |
Bristles (production of filaments to make bristles: D01D/F) | |
Medical devices | |
Strings for tennis rackets | |
Filters (Cigarette filters: A24D 3/00) | |
Extrusion in general | |
Handling of filamentary materials (e.g. winding) | |
Composite materials - (chemical aspects) - (mechanical aspects) | |
Treatment of natural materials to make fibres-(mechanical) - (chemical) | |
Mechanical preliminary treatment of fibres (e.g. cutting, roughening, carding) | |
Spinning and twisting | |
Crimping or curling | |
Yarns and their applications (Tyre yarns see also B60C 9/00) | |
Finishing- (mechanical), - (chemical) | |
Nonwoven fabrics | |
Strings for musical instruments |
A group in D01D is not automatically allocated whenever a specific technique is used or mentioned in a document, but only when important aspects are disclosed related to that technique, or when there is an inter-relationship with the technique used and the other features.
When a document is also related to a neighbouring field it should always be circulated to the related classifiers. In the cases where many different applications of the invention are claimed, the document should only be circulated to the exemplified or the most relevant technical field.
In this place, the following terms or expressions are used with the meaning indicated:
Fibre | a relatively-short, elongated member of natural or artificial material; |
Filament | an endless or quasi-endless, elongated member of natural or artificial material; |
Thread | an assembly of yarns or filaments, usually produced by twisting. |
Yarn | a unitary assembly of fibres, usually produced by spinning; |
This place covers:
The treatment of the fibre-forming material before extrusion.
This place does not cover:
Working of plastics or substances in a plastic state, in general |
This place covers:
Details about the constructional features and the cleaning of spinneret packs, i.e. the devices through which the polymer melt/solution is extruded
This place does not cover:
Rotating spinnerets | |
Spinnerets for making hollow filaments | |
Spinnerets for making fibres with a non-round cross-section | |
Spinnerets for making conjugated filaments | |
Spinnerets for making hollow fibres membranes |
Attention is drawn to the following places, which may be of interest for search:
Extrusion dies |
This place covers:
Formation of filaments or the like
Attention is drawn to the following places, which may be of interest for search:
Production of specific nonwoven fabrics (e.g. electrospun, spunbonded, melt-blown) |
In this place, the following terms or expressions are used with the meaning indicated:
Simultaneous stretching | the stretching is done while the fibres are not yet solidified, i.e. before quenching or the like |
Further details of subgroups
spunbonding and melt-blowing
this group is not in use. Corresponding documents are classified in D01D 5/08 and its subgroups.
Continuous melt-spinning processes including a stretching step on the solid fibres
this group includes both centrifugal spinning and rotating spinnerets for making helically wound filaments (e.g. spiral wire).
e.g. thick-and-thin fibres, beads-on-a-string fibres.
Hollow fibre membranes are normally classified in B01D 69/00 or B01D 71/00 because they are not fibres in the classical sense. They might also get a class in D01D when specific aspects related to the fibre extrusion are mentioned. The production of hollow/tubular articles in general is classified in B29D 22/00- B29D 23/00. When additives are used to make hollow or porous fibres the D01F 1/08 should be given.
This place covers:
Collecting the filaments or the like. Mechanical methods and apparatus for collecting fibres, filaments, yarns, threads or the like after spinning
This place does not cover:
Electrospinning processes and apparatus characterized by the collector | |
Collection with simultaneous imparting of twist |
This place covers:
Physical treatment of the filaments or the like during their manufacture, i.e. during a continuous production process before the filaments have been collected.
This place covers:
Machines including both mechanical apparatus for forming fibres or filaments and mechanical apparatus for assembling the fibres or filaments into threads.