Gl&v-paper Machine Group, Inc.

Jefferson Smurfit Corporation

Jefferson Smurfit Corporation (u.s.)

Marcus Francis Foulger

Hanuman P Didwania

Joseph Edgar Parisian, Iii

John Andrew Taylor

Clyde H Sprague

A system for applying a suspension of uncooked starch particles in water to a web on a forming wire includes a source of such suspension and a source of dilution water, an application die positioned transversely of the web with an internal manifold opening into a downwardly opening die slot through which material flows from the manifold as a falling curtain onto the web. The die has a plurality of transversely spaced inlets leading into the manifold to define transversely spaced application zones across the web. The suspended starch and water are applied from the manifolds through control valves into the inlets by means of which the consistency or concentration of the starch may be varied at positions representing the application zones across the web to provide a desired strength profile to the dried web. The method includes the steps of controlling the ratio of starch and water by proportional valve means in accordance with a desired strength characteristic of the web as measured at the dry end of a paper machine and while maintaining a flow from the die at a relatively constant rate of flow into the fallen curtain of material.

Profiling wet end starch applicator

A method of applying a starch sizing to a forming web on a paper machine, such as in the form of a curtain on a fourdrinier machine, employs a suspension of uncooked particulate starch and water which is applied, as a suspension, to the inlet of a downwardly opening die positioned over the forming web and applied at a consistency of between about 2 to 10% onto the surface of the web as a free falling curtain, the impact velocity of which is controlled to a rate sufficiently low to prevent distortion of the web on impact. Improved drainage is achieved by heating the suspension to a temperature less than about 150.degree., to prevent the cooking of the starched particles. The curtain may be applied to the web at fourdrinier table consistencies as low as about 2% and still obtain starch retention rates of about 80%. An improved coater die for applying a curtain of finely divided material carried as a suspension, such as uncooked starch, on the surface of a newly formed web of paper material has an elongated die body formed as a pair of mating die body portions. The portions define opposed land surfaces which define an extrusion slot. A suspension feed passageway is formed through the die body in communication with the slot and is formed with ends which terminate exclusively at one of the die body portions thereby eliminating the need for a conventional die body end plate. The die lips are chilled to produce a sweating on the surface by moisture condensation for preventing a build up of coating particles at the die lips which would interrupt the integrity of the coating curtain. The feed-through passageway is tapered or reduced in cross section between the inlet and the outlet to maintain a turbulent flow condition therethrough to maintain the particulate material in suspension within the die body.

Wet end starch application

A method of applying a starch sizing to a forming web on a paper machine, such as in the form of a curtain on a fourdrinier machine, employs a suspension of uncooked particulate starch and water which is applied, as a suspension, to the inlet of a downwardly opening die positioned over the forming web and applied at a consistency of between about 2 to 10% onto the surface of the web as a free falling curtain, the impact velocity of which is controlled to a rate sufficiently low to prevent distortion of the web on impact. Improved drainage is achieved by heating the suspension to a temperature less than about 150.degree., to prevent the cooking of the starched particles. The curtain may be applied to the web at fourdrinier table consistencies as low as about 2% and still obtain starch retention rates of about 80%.

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Watertown, NY, United States of America

Marcus Francis Foulger