Webs with an exciting difference!

The latest FEHRER aerodynamic web forming line, comprised of a vibratory chute feed, weighing device, V 21/R pre-web former , K 12 random card and " HIGH-LOFT" device is the most flexible currently available on the world market. A fact underlined by recent product developments.

The new FEHRER line represents the latest advance in a long history of technical progress, which has seen the steady upgrading of a proven basic design. Indeed, over 300 FEHRER lines are presently in operation around the globe.

The line is ideal for applications that range from geotextiles to flooring, and from waddings to automotive trim. What's more, the fibres employed can extend from any synthetic in the 1.5 to 200 denier range, to blends, waste fibres, special fibres such as aramid, wool, cotton and other natural products such as flax, jute and kenaf.

The flexibility of the line is also apparent in connection with its working width, which can be varied between 1.2 and 5.4m. In addition, a width adjustment device permits reductions in the breadth of the finished web. Depending on the raw material used and the web weight, hourly production rates of up to 500 kg/m working width are available and total hourly performance rises in a linear ratio to the working width.

The function of the line is as straightforward as the results are spectacular. Following opening and blending, the material is transported pneumatically to the vibratory chute feed, which supplies a uniform fibre mat to the downstream weighing device.

The V21/R then reopens this web before creating an aerodynamic pre-web (approx. 300-400 g/m2) for optimum feeding of the K 12 random card, where final web forming takes place. The K 12 opens the pre-web and then cards it prior to the even laying of the individual fibres from the drum on the outlet belt. The area weight of the webs can be controlled by means of in- and outlet speed controls.


Single- or multi-layer webs at your fingertips

As the fibres are emitted from the drum by centrifugal force, the various weights of fibre are emitted at differing times with heavier fibres emerging prior to light ones. Using a special deflector tube, these partial fibre flows can be controlled to produce a web, which demonstrates a thoroughly homogeneous fibre blend over the entire web cross-section.

Alternatively, this device can also facilitate the virtual separation of the various fibre components. Depending on requirements, the heavier components can be on the top of the web with the lighter ones below, or vice versa. Moreover, despite this structure, both layers of the web remain inseparable.

Adjustments to the deflector tube make virtually any degree of separation or blending possible. The photo shows two webs consisting of 60% flax and 40% PP fibres, which are black for better definition. In one case, the deflector tube was used for thorough blending and in the other, for maximum separation.

This effect is applied in many filter materials, where graduated filtration over the cross-section is frequently required, in insulation materials with increased insulation on one side and in drainage felts with controlled behaviour.

What's more, product trials can be arranged at any time with FEHRER in the company's brand new testing facilities. All it takes is a telephone call !