nonwoven pillowcase/pillowslip any size, any color, any style, best quality Use ultrasonic heat seal technique for welding Now our factory recommends a new product-----Ultrasonic heat sealed nonwoven pillowcase/pillowslipWe use the ultrasonic techniques for the welding of the nonwoven products. We can offer ultrasonic heat sealed shoe bags, pillowcase/pillow inner case, promotion bag, advertising ...