Seamed press felt with monofilament seam support yarns
A seamed press felt formed from a base fabric having a CD width and an MD length with two opposing MD ends that are joined to form a continuous belt. MD oriented yarns form uniform loops at the two opposing MD ends that are interdigitated to define a pintle channel extending across the CD width. CD oriented yarns are connected to the MD oriented yarns, in a woven or non-woven construction. Loop open spaces are located within the loops on each of the two opposing MD ends in a seam region, with the loop open spaces being defined between a last one of the CD yarns at each of the two opposing MD ends and the pintle channel. At least one CD monofilament support yarn is located in the loop open spaces on each of the two opposing MD ends. The at least one CD monofilament support yarn has a diameter that is at least 1.6 times a diameter of the CD oriented yarns. A pintle extends through the pintle channel to form a seam.
1. A seamed press felt comprising:
a multiaxial base fabric having a CD width and a MD length with two opposing MD ends that are joined to form a continuous belt;
MD oriented yarns form uniform loops at the two opposing MD ends that are interdigitated to define a pintle channel extending the CD width;
CD oriented yarns connected to the MD oriented yarns;
loop open spaces located within the loops on each of the two opposing MD ends in a seam region, the loop open spaces being defined between a last one of the CD yarns at each of the two opposing MD ends and the pintle channel;
at least one CD monofilament support yarn located in the loop open spaces on each of the two opposing MD ends, the at least one CD monofilament support yarn having a diameter that is at least 3 times a diameter of the CD oriented yarns and no more than 7 times the diameter of the CD oriented yarns, and filling at least 25% of a total area of the respective loops;
a pintle extending through the pintle channel to form a seam; and
wherein a width and degree of low pressure areas in the seam region is reduced by 50% or more in comparison to a control sample of a press felt having a same construction except for the at least one CD monofilament support yarn having a same or lesser diameter than the CD oriented yarns.
2. The press felt according to claim 1 , wherein a single one of the CD monofilament support yarns is used in the loop open spaces on each of the two opposing MD ends.
3. The press felt according to claim 1 , wherein no more than two of the CD monofilament support yarns are used in the loop open spaces on each of the two opposing MD ends.
4. The press felt according to claim 1 , wherein two of the CD monofilament support yarns are used in the loop open spaces on each of the two opposing MD ends.
5. The press felt according to claim 4 , wherein the diameter of the CD monofilament support yarns is no more than 4 times a diameter of the CD oriented yarns.
6. The press felt according to claim 1 , further comprising batt fibers needled to the base fabric.
7. The press felt according to claim 1 , wherein an air permeability of the press felt across the seam region is within 15% of an air permeability of the press felt outside of the seam region.
8. The press felt according to claim 1 , wherein an air permeability of the press felt across the seam region is within 10% of an air permeability of the press felt outside of the seam region.
9. The press felt according to claim 1 , wherein the at least one CD monofilament support yarn fills at least 39% of a total area of the loops.
10. The press felt according to claim 1 , wherein the base fabric is woven.
11. The press felt according to claim 1 , wherein the base fabric is non-woven.
12. The press felt according to claim 1 , wherein the at least one CD monofilament support yarn has a diameter of at least 0.5 mm.
13. The press felt according to claim 1 , wherein the at least one CD monofilament support yarn has a diameter of at least 1.0 mm.
14. The press felt according to claim 1 , wherein the at least one CD monofilament support yarn is made of polyurethane.