Press felt

A press felt having a seam and a web-side and a machine-side, the press felt comprising:

• a first fiber layer on the web-side;
• a second fiber layer on the machine-side;
• at least one woven base fabric and at least one spiral fabric between the fiber layers, wherein the at least one spiral fabric comprises:
• a plurality of spiral loop yarns, wherein adjacent spiral loop yarns form channels therebetween, the adjacent spiral loop yarns and channels positioned to extend around the press felt when it is installed in a paper machine, a cardboard machine, a tissue machine or a pulp machine;
• a plurality of pintle wires each extending through one of said channels, and thereby connecting adjacent spiral loop yarns;
• wherein the spiral loop yarns have loops exterior to the channels with free spaces inside the loops;
• and
• wherein filler yarns extend inside the free spaces to enhance entanglement with an adjacent one of the fiber layers, wherein the filler yarns are twisted yarns.