Press felt useful in a wet part of a paper machine, comprises two spirally winded layers, each of which comprises layer strips, where the spirally winded layers lie one upon the other or lie on each other

摘要

The press felt (120) useful in a wet part of a paper machine, comprises two spirally winded layers, each of which comprises layer strips (15, 25), where the spirally winded layers lie one upon the other or lie on each other. The width of the layer strips is smaller than the total width of the layer. The layer strips are arranged with an angle alpha to the direction of the machine in an overlapping manner and have different widths and functions. The layer strips are made of fleeces, lattice structures, non-woven, tissues, knitted fabrics, braided fabrics, thread arrangements, and/or scrims. The press felt (120) useful in a wet part of a paper machine, comprises two spirally winded layers, each of which comprises layer strips (15, 25), where the spirally winded layers lie one upon the other or lie on each other. The width of the layer strips is smaller than the total width of the layer. The layer strips are arranged with an angle alpha to the direction of the machine in an overlapping manner and have different widths and functions. The layer strips are made of fleeces, lattice structures, non-woven, tissues, knitted fabrics, braided fabrics, thread arrangements, scrims, bunches of threads, and/or permeable or impermeable substrate. The layers differentiate itself from each other in characteristics such as thickness, width, structure, design, material and/or function of the layer. The lattice structures are extruded lattice structures, which consist of optionally vulcanized thermoplastic or thermoplastic elastomer. The lattice structures have weight per area of 100-200 g/m 2>, and pore size and -shape. The layers are made of fleece with a weight per area of 80-160 g/m 2>. The thread arrangements, the scrims or bunches of threads have a predefined parallel longitudinal threads, and a thread density of 85-110 threads per 10 cm width. The fiber titer of the thread fibers is 67-100 dtex. An angular offset of the layer strips is less than or equal to the width of the one of the layer strips, corresponds to the narrower or narrowest width of the one of the layer strips, is equally and largely adjusted over the winded total width of the strips and is 10% of the width of the one of the layer strips. The layer strip has a thickness of less than 1 mm and is formed in a single-layered- or multi-layered manner. Independent claims are included for: (1) a method for producing layer structures useful in a press felt; and (2) a device for producing layer structures useful in a press felt.