Non-woven fabrics and method for producing them
AssigneeCarl Freudenberg KG
InventorsRobert Groten, Christoph Josefiak, Georges Riboulet, Peter Dengel
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Abstract
The invention relates to non-woven fabrics comprising threads not produced with the spun-bonding method, for example made of non-melt spinnable thread-forming materials. The use of these fibers, optionally in combination with filaments produced using the spun-bonding method, allows the production of novel non-woven fabrics with novel property combinations. The production can be carried on conventional spun-bonding equipment, wherein part of the extruding devices are used as conveyors for the threads not produced with the spun-bonding method.
Claims30
A non-woven fabric with a basis weight of up to 250 g/m2 and a high level of uniformity, expressed by a mass coefficient of variance of the basis weight distribution CV of less than 10%, as determined by samples measuring 5*5 cm2, comprising randomly deposited threads not produced with the spun-bonding method.
A non-woven fabric comprising randomly deposited threads made of non-melt spinnable materials.
A method for producing non-woven fabrics comprising the following measures:
- i) feeding threads to several supply devices A, particularly threads comprising fibers or filaments made of non-melt spinnable materials,
- ii) optionally feeding threads to further supply devices B, which threads differ from the threads located in the supply devices A,
- iii) pulling the threads off the supply devices A by means of at least one conveying device,
- iv) random depositing of the threads pulled off in step iii) in the form of a non-bonded non-woven onto a transport device in multiple layers,
- v) optionally pulling the threads off the supply devices B by means of at least one conveying device,
- vi) optionally random depositing of the threads pulled off in step v) in the form of a non-bonded non-woven onto a transport device in multiple layers, and
- vii) bonding the obtained non-bonded non-woven by using familiar mechanical, hydromechanical, pneumatic and/or thermal methods and/or by using chemical binding agents.
A method for producing non-woven fabrics comprising the following measures:
- i) feeding threads comprising fibers or filaments made of non-melt spinnable materials originating from a production system A′ used for these threads and pulling these threads off with at least one conveying device,
- ii) optionally feeding threads to several supply devices A, particularly threads comprising fibers or filaments made of non-melt spinnable materials,
- iii) optionally feeding threads to further supply devices B, which threads differ from the threads located in the supply devices A,
- iv) optionally pulling the threads off the supply devices A by means of at least one conveying device,
- v) random depositing of the threads pulled off in step i) in the form of a non-bonded non-woven onto a transport device in multiple layers,
- vi) random depositing of the threads pulled off in step iv) in the form of a non-bonded non-woven onto a transport device in multiple layers,
- vii) optionally pulling the threads off the supply devices B by means of at least one conveying device,
- viii) optionally random depositing of the threads pulled off in step vii) in the form of a non-bonded non-woven onto a transport device in multiple layers, and
- ix) bonding the obtained non-bonded non-woven by using familiar mechanical, hydromechanical, pneumatic and/or thermal methods and/or by using chemical binding agents.
Dependencies are inferred from the claim text.