Device for uniformly applying small amounts of fluid to moving webs
AssigneeEduard Kusters
InventorsWalter Keller, Johannes Kutz, Gerhard Severens
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Abstract
In a three-roller device for uniformly coating a moving web with small quantities of fluid, the middle roller is provided with a contoured or grooved elastic covering, one of the two other rollers with a smooth elastic covering and the third with an incised elastic covering or sheath. Fluid is transferred to the middle roller from the roller which is not in contact with the moving web, the fluid being introduced either via a pool on a trough or via a spraying apparatus.
Claims14
In a device for uniformly applying small quantities of fluid to a moving web, said device comprising a contoured first roller and a pair of second rollers engaging said first roller at diametrically opposed sides thereof, said second rollers having elastic coverings, said web moving between said first roller and one of said second rollers at a nip formed thereby, the other of said second rollers serving to transfer fluid, the improvements wherein:
- the first roller is provided with an elastic covering having a hardness of 80.degree. to 90.degree. Shore D;
- the elastic covering of said first roller is provided with circumferential grooves having an axial center-to-center spacing of 0.3 to 1.5 mm and a depth 0.3 to 1.5 times as large as the center-to-center spacing;
- and
- one of the second rollers is provided with circumferential incisions having a longitudinal spacing of 0.2 to 1 mm and a depth of 0.5 to 1.5 mm.
Dependencies are inferred from the claim text.