Preparation of an absorbent sheet
AssigneeTafnukim Amir Paper Products
InventorMoshe Bachar
Life of this patent
Estimating the term…
Abstract
A sheet of an absorbent material which, comprises a blend of a fibrous substance and of a granulated substance in which the granulated substance is non-uniformly distributed in the sheet, there being alternating zones of higher and of lower density of said substance along the sheet, is prepared by vacuum depositing (16) a dispersion of the fibrous substance (20) on a moving screen (14) and continuously applying the granulated substance (24) while changing the zone of application in a pendulum-like fashion (34, 36) along the screen.
Claims9
A process for the manufacture of a continuous sheet of extended length of an absorbent material, the sheet comprising a blend of a fibrous substance and of a granulated substance, the sheet having alternating zones of higher density of granulated substance and lower density of granulated substance along said length, the process comprising the steps of:
- (a) introducing a dispersion of the fibrous substance into a vacuum chamber having a foraminous screen, the screen moving in a first direction;
- (b) providing a vacuum through the screen so as to deposit the fibrous substance onto the screen;
- (c) continuously discharging the granulated substance through an opening at an end of a discharge means located above the screen and onto the moving screen;
- and
- (d) cyclically reciprocating the end of the discharge means between a first position and a second position so that in a first half of a cycle, the opening moves from the first position to the second position in the first direction so as to form a zone of higher density of granulated substance in said sheet and in a second half of said cycle, the opening moves from the second position to the first position in a second direction, the second direction being opposite of the first direction, so as to form a zone of lower density of granulated substance in said sheet.
An apparatus for the manufacture of a continuous sheet of an absorbent material, the sheet comprising a blend of a fibrous substance and a granulated substance, the sheet being of extended length and having alternating zones of higher density of granulated substance and lower density of granulated substance along said length, the apparatus comprising:
- (a) a vacuum chamber having an inlet for introducing a dispersion of the fibrous substance into said chamber;
- (b) a foraminous screen located in said vacuum chamber, said screen being adapt to move in a first direction;
- (c) vacuum forming means for providing a vacuum through said screen for depositing the fibrous substance onto said screen;
- (d) a discharge means having an opening at an end thereof above said screen for continuously discharging granulated substance onto said screen;
- and
- (e) a driving mechanism for cyclically reciprocating said end of said discharge means between a first position and a second position such that in a first half of a cycle, said opening is moved from said first position to said second position in said first direction so as to form a zone of higher density of granulated substance in said sheet and in a second half of said cycle, said opening is moved from said second position to said first position in a second direction, said second direction being opposite of said first direction so as to form a zone of lower density of said granulated substance in said sheet.
Dependencies are inferred from the claim text.