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PROCEDIMENTO E DISPOSITIVO PER FORMARE NASTRI CON PROFILI DI GRAMMATURA PREDETERMINATI PARTICOLARMENTE NASTRI DI MATERIALE PARTICELLARE DI LEGNO O FIBRE SINTETICHE

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Title:
PROCEDIMENTO E DISPOSITIVO PER FORMARE NASTRI CON PROFILI DI GRAMMATURA PREDETERMINATI PARTICOLARMENTE NASTRI DI MATERIALE PARTICELLARE DI LEGNO O FIBRE SINTETICHE
Author: SISLEGARD LARS OTTO ; THORBJORNSSON SVEN INGVAR
Subjects: BRAIDING ; CIGARETTES ; CIGARS ; COTTON-WOOL ; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS ; HUMAN NECESSITIES ; IMPREGNATING OR COATING OF PAPER ; KNITTING ; LACE-MAKING ; MACHINES FOR MAKING CIGARS OR CIGARETTES ; MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL ; MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUTORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTINGOF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL ; METHODS OF PRODUCING PAPER THEREON ; NAILING OR STAPLING MACHINES IN GENERAL ; NATURAL OR ARTIFICIAL THREADS OR FIBRES ; NON-WOVEN FABRICS ; PAPER NOT OTHERWISE PROVIDED FOR ; PAPER-MAKING ; PAPER-MAKING MACHINES ; PERFORMING OPERATIONS ; PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING ; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D ; PRODUCTION OF CELLULOSE ; PULP COMPOSITIONS ; SMOKERS' REQUISITES ; SPINNING ; TEXTILES ; TOBACCO ; TRANSPORTING ; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G ; TRIMMINGS ; WADDING ; WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL
Description: A method and apparatus for forming a web having a predetermined grammage profile in its transverse direction is provided. The method includes the steps of introducing a flow of particulate material into the distribution chamber of a forming head through an oscillating nozzle and depositing the material on an air permeable belt to form a web while changes in the upper surface of the web are detected downstream of the distribution chamber, signals are generated in response to any change which are compared with predetermined set points, and an output control signal is generated as a result of the comparison. The pattern of movement of the nozzle is controlled in response to the output control signal to provide the predetermined grammage profile for the web. In addition, the speed of the web may be measured and used to control the frequency of the nozzle so that a web having uniform grammage in the longitudinal direction is also provided. An apparatus for accomplishing each of the steps of the method is additionally provided.
Creation Date: 1987
Language: Italian
Source: esp@cenet

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PROCEDIMENTO E DISPOSITIVO PER FORMARE NASTRI CON PROFILI DI GRAMMATURA PREDETERMINATI PARTICOLARMENTE NASTRI DI MATERIALE PARTICELLARE DI LEGNO O FIBRE SINTETICHE

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