Process and devices for producing a sheet-like spun-bonded web product

摘要

Process for producing a sheet-like spun-bonded web product from thermoplastic fibres by means of a web-blowing head which has a nozzle plate with at least one row of nozzle bores for the thermoplasticised plastic, flow channels for sheet-like blowing-air jets and an outlet gap, coordinated with the width of the sheet-like spun-bonded web product to be produced, for the blowing-air/fibre mixture. Associated therewith is a depositing device with a continuously moved screen band, on which the fibres are deposited to form the sheet-like spun-bonded web product, at least one of the quantities, namely nozzle-plate temperature, outlet-gap thickness and air-flow resistance of the depositing device, being varied operationally for the purpose of controlling and/or regulating the weight per unit area and/or air permeability of the sheet-like spun-bonded web product. Devices for carrying out the process according to the invention are also specified. <IMAGE>