PP Spun bonded nonwoven fabric making machinery HG NONWOVEN MACHINERY CO.,LTD. www.hgnonwoven.com The spunbond process is a nonwoven manufacturing system involving the direct conversion of a polymer into continuous filaments, integrated with the conversion of the filaments into a random-laid,...Send InquiryChat Now
PP Spun bonded nonwoven fabric making machinery
HG NONWOVEN MACHINERY CO.,LTD.
The spunbond process is a nonwoven manufacturing system involving the direct conversion of a polymer into continuous filaments, integrated with the conversion of the filaments into a random-laid, bonded nonwoven fabric. The spun bond process is one of the newer nonwoven technologies, having first been commercialized in the mid-1960's. Spunbond technology has received considerable attention since its initial introduction, as the resulting product has met some important market needs.
The typical spunbond nonwoven process consists of several integrated steps in the conversion of polymer / resin pellets into a finished nonwoven fabric. The major elements of the process are:
Polymer Feed. Polymer feedstock in pellet or powder form is conveyed from storage bins or silos to the feeder section of an extruder.
Extruder. Polymer feedstock is mixed with stabilizers, additives, color master-batch, resin modifiers, or other additives. This blend of raw materials is melted within the extruder barrel.
Fiber Spinning. The molten polymer mix is pumped through a heated conduit to a resin filter system and then to a distributor section that leads to the spinnerette units. The spinnerette usually consists of a perforated plate arranged across the width of the line. The resin is forced through the many small holes in the spinnerette plate to form continuous filaments.
Quenching / Attenuation Zone. As the filaments emerge through the spinnerette holes, they are directed downward into quench chambers or chimneys. As the filaments travel through these chambers, cool air is directed across the filament bundle to cool the molten filaments sufficiently to cause solidification. The filaments are then led further downward into a tapered conduit by an airsteam. A second stream of high velocity air is directed parallel to the direction of the filaments, causing an acceleration and accompanying attenuation or stretching of the individual filaments. This mechanical stretching results in increased orientation of the polymer chains making up the continuous filament. Such orientation leads to increased filament strength, along with modification of other filament properties, including the filament denier or thickness.
Web Forming. The filaments are deposited in a random manner on a moving, porous forming belt. A vacuum under the belt assists in forming the filament web on the forming belt and in removing the air used in the extrusion / orientation operation. In some processes, an electrostatic charge is placed on the filament bundle to ensure spreading and separation of individual filaments. In other processes, deflector plates are used to lay down the filament sheet in a random manner on the forming belt.
Bonding. The continuous filament web is delivered to a bonding section, where one of several bonding methods can be used to bond the loose filaments into a strong, integrated fabric.
Slitting / Winding. The bonded fabric encounters a slitting section where the two edges are trimmed to eliminate the non-uniform, rough edge created during the manufacturing step. In some operations, the fabric may also be further slit into precise, smaller widths to provide finished rolls of precise dimension. Following slitting, the fabric is wound onto a larger roll, either a full width roll or a series of narrow slit rolls. From this point, the fabric rolls are ready for wrapping and shipping.
Raw material ----> Melting ----> Filtering ----> Measuring ----> Spinning ----> Cooling ----> Stretching ----> Web forming ----> Calendering ----> Winding ----> Cutting----> Fabric roll