Carding Apparatus Profile Device for Web Thickness

The fiber pile is profiled before carding to pre-compensate for the smile effect and edge thickening that will occur during carding. By creating a convex profile in advance, the subsequent carding process produces a uniform pile thickness across the width, eliminating the need for post-processing adjustments.

The invention changes the physical parameter of the fiber pile by applying controlled stretching and compressing forces through profiling devices. This modifies the pile's cross-sectional shape from a standard uniform profile to a predetermined convex profile that compensates for carding-induced thickness variations.

By profiling the fiber pile before laying, the system pre-compensates for thickness variations that would cause vibrations during carding of wide fabrics. This preliminary adjustment ensures uniform pile thickness across the entire laying width, enabling stable production of large-area nonwoven fabrics without manufacturing defects.

The profiling device applies different stretching and compressing forces to different regions of the fiber pile cross-section. The edges receive different treatment than the center, creating a localized convex profile that specifically addresses edge thickening and smile effect, thereby ensuring uniform thickness across the entire width during subsequent carding.

The invention converts the harmful carding nap effects (smile effect and edge thickening) into a benefit by using the profiling device to create a compensating convex profile. The harmful thickness variations are transformed into a deliberate pre-profile that, when carded, produces the desired uniform web thickness.

The profiling device applies forces in advance to counteract the upcoming harmful effects of carding. By stretching the edges and compressing the center of the fiber pile before carding, the system creates a pre-profile that opposes and neutralizes the smile effect and edge thickening that will occur during the carding process.