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US 4,055,460 AGranted
Paper machine shake
AssigneeJWI Ltd.
InventorJohn Gordon Buchanan
Life of this patent
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AssigneeJWI Ltd.
InventorJohn Gordon Buchanan
Estimating the term…
The invention is to shake the upper run of a Fourdrinier forming fabric of a paper machine by imparting vibratory motion, in a direction transverse to the machine direction, to light-weight foil blades mounted at the dilute end of the Fourdrinier section. The foils, which are in contact with the fabric, cause the upper run to vibrate in the same transverse direction, thereby shaking the stock and improving paper formation. It is preferred to vibrate the foils at a frequency close to the resonant natural frequency of the upper run of a fabric or a harmonic thereof. All or part of the top surface of some of the foils, which contact the upper run of the forming fabric, may be coated with a material having a relatively high coefficient of friction to increase the frictional contact between the upper surface of the foil and the forming fabric.
Shaking means for use on a paper making apparatus which includes an endless belt-like forming fabric driven in a machine direction by a drive roll, said fabric having an upper stock carrying run having a natural frequency of lateral vibration and a lower run between the drive roll and a driven roll and including dewatering foils, disposed between the upper run and lower run, underlying and supporting the upper run at intervals in a dewatering zone, said shaking means for vibrating the upper run of the fabric including movable foil means, said shaking means comprising one or more elongated foil members disposed in a substantially horizontal attitude for engagement transversely on the under surface of the upper run downstream of a stock feed end in the dewatering zone, said foil members being mounted for limited independent movement in a cross machine direction while engaging the under surface of the said upper run and said foil members having a continuous, uninterrupted top flat fabric supporting surface over the entire length thereof in frictional contact in the cross machine direction with the said under surface of the fabric;
The method of producing paper and ensuring a uniform repetitive quality of the paper comprising the steps of:
Shaking means for vibrating a stock carrying run of an endless belt-like forming fabric of a paper making apparatus, said stock carrying run having a natural frequency of lateral vibration;
A method of producing paper having uniform formation on a paper making machine comprising a forming section having an endless fabric forming belt which has a stock-carrying run having a natural frequency of lateral vibration, comprising the steps of:
Dependencies are inferred from the claim text.