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AssigneeSCA Hygiene Products AB
InventorRalph Dovertie
Estimating the term…
A method and a device of forming a composite web containing at least one layer of superabsorbent particulate material and at least one layer of fibrous material, the web being intended for use as an absorbent structure in absorbent articles. The layers of fibrous material and at least one layer of particulate material are deposited in consecutive steps on a moving foraminous support (12), wherein the airborn stream of particulate material when entering an applicator chamber (15) is allowed to expand and is forced to change flow direction at an angle between about 90 and about 125° , preferably between 100 and 120°, with respect to the first flow direction , resulting in a considerable reduction of speed of the stream of particulate material as it exits the outlet opening (19) of the applicator chamber (15). The invention further refers to an absorbent structure has a composite web made according to the method and includes at least one discrete layer (22a,b) of superabsorbent particles arranged between discrete layers (19a-c) of fibrous material.
A method of forming a composite web structure containing at least one layer of particulate material and at least one layer of fibrous material, said web structure being adapted for use as an absorbent structure in an absorbent article, the method comprising:
A device for forming a composite web containing at least one layer of particulate material and at least one layer of fibrous material, said web being adapted for use as an absorbent structure in an absorbent article, said device comprising a device for depositing at least one layer of fibrous material and a device for depositing at least one layer of particulate material in consecutive steps on a moving foraminous support to form layers on top of each other, at least one conveyor for feeding an airborn stream of particulate material in a first flow direction at a speed of about 25 m/s or higher to an applicator chamber, said applicator chamber having an outlet opening located adjacent said foraminous support, and having a cross sectional area that increases towards said outlet opening, so that the airborn stream of particulate material when entering said applicator chamber is allowed to expand, said applicator chamber further having at least one curved or angled wall portion positioned at an angle between about 90 and about 125° to said first flow direction so as to cause said airborn stream of particulate material to hit said wall portion and change flow direction to a second flow direction, resulting in a considerable reduction of speed of the airborn stream of particulate material as it exits the outlet opening of the applicator chamber.
Dependencies are inferred from the claim text.