Fehrer system final
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The document summarizes different types of Fehrer carding systems used to produce air-laid nonwoven webs. It describes the K-12 and K-21 machines, including their operating principles, specifications, applications and advantages. It also discusses recent developments like the V-12R machine, which can produce heavier weight webs at higher throughput for uses like insulation felts and automotive waddings.
Fehrer system final
- 2. FEHRER CARDS Muhammad Asif Raza 10-NTU-6010
- 3. AIR-LAID WEB FORMATION The air-laying process belongs to a group of web formation processes by dry-laying, which use air as conveyance means, from the preparation of the raw material to the web formation system. The process consists in conveying the fibers, by aerodynamic flows, through perforated rotary rollers or through distribution systems, to form the web and deposit it on a conveyor belt. 3
- 4. CARDING PROCESS 4
- 5. 5
- 6. FEHRER SYSTEM Randomized webs production Areal mass 200 ~ 2000 g/m 2. Laminar Airflow. Suited to fiber fineness 10 ~ 110 dtex. Machines K12 (first machine) K21 (New machine) 6 V-12-R (Recent Developments)
- 7. K12 MACHINE First Introduced in 1968. Weight Range 20 ~ 2000 g/m2. Laminar Airflow Suitable for coarse fibers (10~110 dtex) 7
- 8. WORKING OF K-12 8
- 9. ADVANTAGES OF K12 Less web weight at the same web height, or increased web height at the same web weight. Improved web resilience and elasticity. Enhanced web precision. 9
- 10. SPECIFICATIONS Working widths (m): 1.2 - 5.4 Production speeds (m/min): up to 30 Weight range (g/m2): 40 - 3000 * in special configuration up to 6000 Capacity (kg/m/h): up to 450 10
- 11. APPLICATIONS OF K-12 WEBS Clothing and furniture industry wadding Filter materials. Make-up pads, etc 11
- 12. K-21 MACHINE Lighter wt. air Laid system Fabric of wt. 10~100 g/m2. Four Carding cylinders Fibers deposited in four different positions 12
- 13. CHARACTERISTICS OF FEHRER K-21 WEBS Highly isotropic and porous structure Lofty and good compressional characteristics. Soft Handle of webs formed. High Absorbency and wicking rate. High thermal resistance. Fibers from 1.7 to 3.3 dtex can be processed on the K21 to produce webs for hygienic and sanitary applications, for interlinings and basic material for cleaning cloth as well as coating 13 carriers.
- 14. WORKING OF FEHRER K-21 The K21 can follow a roller card or a combination of roller card and horizontal web laying device. It is, however, also offered by the manufacturer as an installation together with the pre-web forming device V21/R. The characteristic feature of the K21 is the use of four successive card cylinders which are each equipped with a pair of working/clearer rollers. 14
- 15. WORKING OF FEHRER K-21 A pre-web is fed via a tray feeding device (1) to the first card cylinder (2). Due to the centrifugal force, this cylinder throws part of the fibre amount through a fibre guiding channel (3) onto the suction screen belt (4), the majority of the fibres is transferred to the second card cylinder (5). This is done in an analogous way when transferring the material to the following card cylinders. A four-layer web is produced, the layers of which are inseparably linked to each other due to the three- dimensional depositing of the fibres. 15
- 16. END PRODUCTS OF FEHRER SYSTEM WEBS Interlinings Shoe linings HIGH-LOFT products for the garment and furniture industries Base material for coating substrates and synthetic leather Waddings 16
- 17. END PRODUCTS OF FEHRER SYSTEM WEBS Geo textiles Filter materials Carpets and wall coverings Technical felts 17
- 18. Comparison K-12 K-21 Weight 20 ~ 2000 g/m2 10 ~ 100 g/m2 Fiber 10 ~ 110 Dtex 1.7 ~ 3.3 Dtex Width 1.2 ~ 2.0 mtr upto 5.4 mtr
- 19. RECENT DEVELOPMENTS IN FEHRER SYSTEM To produce economic webs with high weights and throughput for, Insulationfelts, Waddings for the upholstery and Automotive industry 19
- 20. RECENT DEVELOPMENTS IN FEHRER SYSTEM V-12R With 5.4m working widths It consists of a smooth pressure roller, inlet roller, nose bar, picker and a perforated drum with a suction device inside. The perforated drum can be adjusted both horizontally and 20 vertically, and there is also a suction device underneath the
- 21. RECENT DEVELOPMENTS IN FEHRER SYSTEM V-12R Web forming zone with suction from both sides, which provides all the benefits derived from isotropy. Textile waste fibres, synthetic fibres, all natural fibres (e.g. coir, sisal, jute hemp, flax, cotton) and animal fibres, as well as fibre blends can be run on this machine. 21
- 22. RECENT DEVELOPMENTS IN FEHRER SYSTEM V-12R An economic machine to the market which, depending on type of the fibre used, has a weight range of 300 - 6000 g/m2 and a throughput of up to 1500 kg/m/h 22
- 23. RECENT DEVELOPMENTS IN FEHRER SYSTEM V-12R Other advantages of this machine include; Space saving design Low investment costs Economic production 23
- 24. THANKS FOR LISTENING WITH PATIENCE 24