Screen cylinder stress concentration relief

D - Textiles – Paper – 21 – D

Patent

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Details

D21D 5/16 (2006.01)

Patent

CA 2334572

A screen cylinder, and a method of making the screen cylinder, take into account the stress concentrations that are formed, particularly at the inner and outer surfaces of the finished screen cylinder, so as to minimize them. The stress relief minimization is accomplished by providing a plurality of stress relief grooves (25) in land areas (121) between accept flow providing grooves (113) that are in substantially end-to-end alignement, the stress relief grooves each having a depth between about 10-80 % (e.g. between about 40-60 %) of the thickness dimension (119) of the plate (110), so as to reduce by at least 10 % (e.g. about 30-50 %) the magnitude of deformation of the screen slots (115) due to compression or tension in the surfaces of the screen cylinder as a result of cylinder formation from the plate, compared to if the relief grooves were not present.

Cette invention se rapporte à un cylindre tamiseur et à un procédé de fabrication de ce cylindre tamiseur, qui prennent en considération les concentrations de contraintes qui se forment notamment aux surfaces interne et externe du cylindre tamiseur fini, afin de les réduire au minimum. Cette réduction et cette relaxation des contraintes sont obtenues grâce à la présence de plusieurs rainures de relaxation de contraintes (25) dans des zones plates (121) situées entre les rainures (113) formant le flux d'entrée qui sont essentiellement alignées bout à bout, ces rainures de relaxation des contraintes ayant chacune une profondeur d'environ 10 à 80 % (notamment 40 à 60 %) de l'épaisseur (119) de la plaque (110), afin de réduire d'au moins 10 % (notamment d'environ 30 à 50 %) l'amplitude de la déformation des fentes (115) du tamiseur due à la compression ou à la tension se produisant aux surfaces du cylindre tamiseur lors de la formation du cylindre à partir de la plaque, par rapport à la situation dans laquelle des rainures de relaxation des contraintes ne seraient pas présentes.

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