Method and apparatus for depositing particles on a moving web of material
First Claim
1. An arrangement for depositing particles onto a moving material web, said arrangement comprising:
- a particle dispenser;
a perforated belt which moves over the material web;
the particle dispenser includes means for dispensing the particles continuously in a uniform and wide flow whose width is equal to or greater than the width of a hole-pattern of the belt;
the perforated belt extends in a same direction as the material web;
the belt is spaced from the material web at a distance which is at least sufficient to accommodate the particles deposited on the material web between said belt and said web; and
the arrangement includes means for removing particles which have been caught by the belt without the particles falling down onto the underlying material web, said means being located downstream of the particle dispenser.
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Accused Products
Abstract
An arrangement for depositing particles onto a moving material web includes a particle dispenser and a perforated belt which moves over the material web. According to the invention, the particle dispenser is intended to dispense particles continuously in a uniform and wide flow whose width is equal to or somewhat greater than the width of the hole-pattern of the belt and the belt is spaced at a distance from the material web which is at least sufficiently large for the particles deposited on the material web to be accommodated between the belt and the web. The arrangement also includes means which function to remove particles caught by the belt without the particles falling down onto the underlying material web. These means are located downstream of the particle dispenser. The invention also relates to a method for depositing particles to a moving material web.
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Citations
24 Claims
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1. An arrangement for depositing particles onto a moving material web, said arrangement comprising:
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a particle dispenser; a perforated belt which moves over the material web; the particle dispenser includes means for dispensing the particles continuously in a uniform and wide flow whose width is equal to or greater than the width of a hole-pattern of the belt; the perforated belt extends in a same direction as the material web; the belt is spaced from the material web at a distance which is at least sufficient to accommodate the particles deposited on the material web between said belt and said web; and the arrangement includes means for removing particles which have been caught by the belt without the particles falling down onto the underlying material web, said means being located downstream of the particle dispenser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for depositing particulate material onto a moving web of fibrous material through the intermediary of a perforated masking belt which moves at a distance above said web, so as to deposit the particulate material onto the web of fibrous material in discrete layers of uniformly distributed particles, comprising the steps of:
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driving the perforated belt in a same direction as the underlying web of fibrous material; dispensing the particles continuously from a particle dispenser in a uniform flow whose width is equal to or greater than a width of holes in the masking belt, so that the particulate material falls down through the holes in the masking belt and deposits on the web of fibrous material in a configuration corresponding to a hole pattern in the masking belt; and removing from the masking belt those particles which have been caught by said belt without falling down onto the underlying web of fibrous material and without said removal having a disturbing influence on the discrete particle layers deposited on said web of fibrous material. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of making a composite material that includes a fibrous material with particulate material thereon, comprising the steps of:
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moving a web of fibrous material in a given direction; driving a masking belt having a plurality of perforations in a hole pattern therein in the given direction at a distance above said fibrous material; depositing in a uniform flow a layer of particulate material onto the masking belt, said uniform flow having a width that equals or exceeds a width of the perforations so that the particulate material falls down through the perforations in the masking belt and is deposited on the fibrous material in a configuration corresponding to the hole pattern in the masking belt; and removing from the masking belt the particulate material which has been caught by the masking belt without disturbing the particulate material deposited on said fibrous material. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification