Plant for producing a non-woven fiber product

A plant for producing a non-woven. web-formed fiber product comprising:

• a first endless forming wire having an inlet and an outlet end and a lower and an upper part, configured such that the upper part of the first wire, at the inlet end picks up a carded or air-laid layer of fiber in operation and transports the layer to the outlet end of the first wire;
• a roller with an upper and lower roller part for compressing the fiber layer;
• a second endless wire having a lower and an upper part wherein the lower part of the second wire extends between the upper and lower roller part of the roller and the lower part of the second wire extends at least to the outlet end of the first wire;
• and
• a first suction arrangement positioned above at least a portion of the lower part of the second wire,
• wherein the upper part of the roller is a stationary, smooth sheet.

A plant for producing a non-woven, web-formed fiber product comprising:

• a first endless forming wire having an inlet and an outlet end and a lower and an upper part, configured such that the upper part of the first wire, at the inlet end, picks up a carded or air-laid layer of fiber in operation and transports the layer to the outlet end of the first wire;
• a roller with an upper and lower roller part for compressing the fiber layer;
• a second endless wire having a lower and an upper parts wherein the lower part of the second wire extends between the upper and lower roller part of the roller and the lower part of the second wire extends at least to the outlet end of the first wire;
• and
• a first suction arrangement positioned above at least a portion of the lower part of the second wire,
• wherein the upper part of the roller is a perforated sheet extending underneath the first suction arrangement.

A plant for producing a non-woven, web-formed fiber product comprising:

• a first endless forming wire having an inlet and an outlet end and a lower and an upper part, configured such that the upper part of the first wire, at the inlet end, picks up a carded or air-laid layer of fiber in operation and transports the layer to the outlet end of the first wire;
• a roller with an upper and lower roller part for compressing the fiber layer;
• a second endless wire having a lower and an upper part, wherein the lower part of the second wire extends between the upper and lower roller part of the roller and the lower part of the second wire extends at least to the outlet end of the first wire;
• a first suction arrangement positioned under at least a portion of the upper part of the first wire;
• and
• a second suction arrangement positioned above at least a portion of the lower part of the second wire between the outlet end of the first wire and the roller, wherein said second suction arrangement is provided by a rotating, perforated drum that is connected to a vacuum source.

A method for producing a non-woven, web-formed fiber product comprising:

• carding or air-laying a layer of loose fibers on a first endless forming wire having an inlet and an outlet end and a lower and an upper part and transporting this layer in a transport direction to the outlet end of the first wire;
• pre-compressing the fiber layer and at the same time pressing air out of the layer between the upper part of the first endless forming wire and a section of a lower part of the second wire, which section is positioned above the first wire;
• transferring the pre-compressed fiber layer from the upper part of the first wire to the lower part of the second endless wire;
• compressing the fiber layer placed on the lower part of the second endless wire and at the same time pressing more air out of the fiber layer in a roller with an upper roller part placed above and a lower roller part placed underneath the lower part of the second endless wire;
• suctioning the fiber layer against the underside of the lower part of the second endless wire simultaneously with suctioning air out of the fiber layer by means of a first suction arrangement placed above the lower part;
• and
• suctioning air out of the fiber layer placed on the upper part of the first endless forming wire by means of a second suction arrangement that overlaps the first suction arrangement of the second wire and which is placed underneath the upper part of the first wire.