with exposure time controlled by the belt speed after cooling the fused fabric surface was smooth and each crossover point was found to be firmly bonded together resulting in excellent dimensional stability while the unfused needled surface of the fabric retained its fibrous structure and was compressible in another embodiment a core wrap yarn was prepared using the following components core three ends of dupont nylon 840 denier 140 filaments type 715 inner and outer wraps two ends of 420 denier 35 filament twist 0 52 herculon olefin yarn type 309 inner wrap in 34 z 34 direction and outer wrap in 34 s 34 direction using the above core wrap yarn in both warp and filling directions a woven structure was formed into an endless belt a fibrous batt comprising 50 by weight of 6 0 denier 2 5 34 polypropylene staple and 50 nylon 6 6 of 6 denier 3 34 staple was needled onto its uppermost surface the endless belt mounted between two rotating rolls with a tension of 5 pounds per lineal inch applied to it was subjected to 340 u00b0 f temperature the undersurface of the fabric was fused while maintaining tension with exposure time controlled by the felt speed after cooling the fused fabric surface was found smooth batt layer anchored firmly to the base fabric with each crossover point bonded together resulting in excellent dimentional stability in another embodiment a core wrap yarn was prepared using the following components b three ends of 350 denier 34 filaments low temperature meltable nylon type grilon k115 emser industries inner and outer wrap yarn two ends of 350 denier 34 filaments grilon k115.