Mechanical Force
Compression applied by rollers in a padding machine regulates the volume of liquid retained by a moving textile web. The foulard squeeze pressure dictates the wet pickup percentage before the fabric enters a drying oven. Two or more rollers, usually covered in rubber or synthetic polymers, exert this force to drive the finish into the interstices of the yarn.
Adjusting the nip load ensures a uniform application across the entire width of the material.
Roller Configuration
Hardness of the roller covering and the diameter of the cylinders change the contact area at the nip. Higher foulard squeeze pressure reduces the amount of liquid left in the fabric by physically pushing it out. This mechanical action is more effective than vacuum extraction for high speed continuous processing.
Precise pneumatic or hydraulic controls maintain the loading even as the fabric thickness varies.
Uniformity Requirement
Uneven loading across the roller face causes side to center shading or inconsistent chemical performance. Measuring the foulard squeeze pressure at multiple points helps identify if the rollers are bowing under the load. Modern machines use internal pressure adjustment systems to counteract the natural deflection of the cylinders.
Consistent pressure prevents the migration of dyes during the drying stage.
Absorption Limit
Maximum saturation depends on the porosity of the fibre and the speed of the line. Excess foulard squeeze pressure can damage delicate structures or flatten the pile of a fabric. The limit is reached when no further liquid can be removed without compromising the integrity of the material.
