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MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
Definition statement
This subclass/group covers:

Mechanical methods and apparatus for the manufacture of artificial fibres and filaments.

It does also cover the physical and mechanical treatment of fibres and filaments during their production, e.g. before winding (after production: D01G, D02).

Relationship between large subject matter areas

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.

References relevant to classification in this subclass
This subclass/group 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
Informative references
Attention is drawn to the following places, which may be of interest for search:
Shaping foodstuffs by extruding
Composite materials - (chemical aspects) - (mechanical aspects)
Treatment of natural materials to make fibres-(mechanical) - (chemical)
Finishing- (mechanical), - (chemical)
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)
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)
Nonwoven fabrics
Strings for musical instruments
Special rules of classification within this subclass

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.

Glossary of terms
In this subclass/group, 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;
Treatment of filament-forming or like material (working of plastics or substances in a plastic state, in general B29)
Definition statement
This subclass/group covers:

The treatment of the fibre-forming material before extrusion.

References relevant to classification in this group
This subclass/group does not cover:
Working of plastics or substances in a plastic state, in general
Spinnerette packs; Cleaning thereof ( {D01D 5/0069} , D01D 5/24, D01D 5/253, D01D 5/28 take precedence)
Definition statement
This subclass/group covers:

Details about the constructional features and the cleaning of spinneret packs, i.e. the devices through which the polymer melt/solution is extruded

References relevant to classification in this group
This subclass/group does not cover:
Spinnerets for making fibres with a non-round cross-section
Spinnerets for making hollow fibres membranes
Rotating spinnerets
Spinnerets for making hollow filaments
Spinnerets for making conjugated filaments
Informative references
Attention is drawn to the following places, which may be of interest for search:
Extrusion dies
Formation of filaments, threads, or the like
Definition statement
This subclass/group covers:

Formation of filaments or the like

Informative references
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)
Glossary of terms
In this subclass/group, 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.

Collecting the newly-spun products { (D01D 5/0076 takes precedence) } (collecting newly-spun products with the imparting of twist D01H)
Definition statement
This subclass/group covers:

Collecting the filaments or the like. Mechanical methods and apparatus for collecting fibres, filaments, yarns, threads or the like after spinning

References relevant to classification in this group
This subclass/group does not cover:
Collection with simultaneous imparting of twist
Electrospinning processes and apparatus characterized by the collector
Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected (finishing D02J)
Definition statement
This subclass/group 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.

References relevant to classification in this group
This subclass/group does not cover:
Chemical or physicochemical treatment during manufacture
Mechanical treatment after manufacture
Spinning of yarns
Yarns
Production of fabrics
Complete machines for producing artificial threads
Definition statement
This subclass/group covers:

Machines including both mechanical apparatus for forming fibres or filaments and mechanical apparatus for assembling the fibres or filaments into threads.

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Last Modified: 10/11/2013