Claims
- 1. Apparatus for continuously coating a strip of material, such as a web of paper, with a liquid, comprising a support member over which the strip material is passed in the coating operation, wall means forming a box having at least one open side, said box positioned adjacent said support member so that a portion of the periphery of said support member is located within the range of the open side in said box, means for supplying a coating liquid into said box so that the strip of material passing over said support member contacts the liquid therein, a first flexible wiping blade positioned within said box and extending into the range of the open side of said box for providing a wiping action on the strip of material following the completion of its passage in contact with the coating liquid, said first wiping blade having a supported edge spaced from said support member and a free edge spaced from and opposite said supported edge with said free edge being in line contact with the strip of material passing over said support member to effect said wiping action the combination of said wall means, said support member for the strip material and said first wiping blade providing a closed chamber containing the coating liquid, and means in communication with said closed chamber for providing a partial vacuum within said closed chamber as compared to higher pressure conditions exterior of said closed chamber, said first wiping blade extending between said free edge and said supported edge positioned to be exposed to and flexibly responsive to the partial vacuum within said closed chamber and the higher pressure conditions exterior of said closed chamber, and means for varying the angle between said first wiping blade and the strip of material, and said means for varying the angle between said first blade and the strip of material comprises a portion of the closed chamber wall having the shape of a circular arc, and a part secured to said supported edge of said first blade spaced from said support member and having the shape of a circular arc complementary to and movably mounted on said arcuate wall portion, and means disposed within the chamber defining a pivotably adjustable spillway for regulating the level of the coating liquid therein, and further means comprised of a bottom portion of the chamber wall providing a preliminary smoothing and compressing action on the strip, said further means comprising a flexible blade member disposed in a biased contact with said strip as it commences its passage through the closed chamber.
- 2. Apparatus, as set forth in claim 1 including means for exerting a torque on said second blade at a position spaced from its linear edge contact with the strip of material supported on said support member for holding it against said support member.
- 3. Apparatus, as set forth in claim 2, wherein said means for exerting a torque on said second blade comprises a channel located at a portion of said second blade spaced from said support member and a tube having a regulable hydraulic pressure therein for adjustably controlling the torque acting on said second blade.
- 4. Apparatus, as set forth in claim 2, wherein said support member comprises a cylindrically shaped roller having its axis arranged horizontally and the location of contact of said second blade with the strip of material supported on said support member positioned below said first wiping blade.
- 5. Apparatus, as set forth in claim 1, wherein said wall means comprises stationary side walls disposed in spaced relationship to said support member and movably positionable side walls mounted on said fixed side walls and arranged to be positioned in sealing contact with the strip of material supported on said support member.
- 6. Apparatus for continuously coating a strip of material, such as a web of paper, with a liquid, comprising a support member over which the strip of material is passed in the coating operation, wall means forming a box having at least one open side, said box positioned adjacent said support member so that a portion of the periphery of said support member is located within the range of the open side in said box, means for supplying a coating liquid into said box for providing a body of the coating liquid therein within the range of the open side of said box so that the strip of material passing over said support member contacts the body of the coating liquid therein, a flexible wiping blade positioned in said box and adapted to provide a wiping-off action on the strip of material following the completion of its passage in contact with the coating liquid said wiping blade having a supported edge spaced from said support member and a free edge spaced from and opposite said supported edge with said free edge being in line contact with the strip of material passing over said support member whereby to effect said action, the combination of said wall means, said support member for the strip material and said wiping blade providing a closed chamber containing the coating liquid, means for varying the angle between said wiping blade and the strip of material, means in communication with said closed chamber for providing a partial vacuum within said closed chamber as compared to a higher air pressure on the exterior of said closed chamber whereby, to influence said flexible wiping blade contact with the coated strip and said means for varying the angle between said wiper blade and the strip of material comprises a portion of the closed chamber wall having the shape of a circular arc, and a part secured to said supported edge of said wiper blade spaced from said support member and having the shape of a circular arc complementary to and movably mounted on said base arcuate wall portion, and means disposed within the chamber defining a pivotably adjustable spillway for regulating the level of the coating liquid therein, and further means comprised of a bottom portion of the chamber wall providing a preliminary smoothing and compressing action on the strip, said further means comprising a flexible blade member disposed in a biased contact with said strip as it commences its passage through the closed chamber.
- 7. Apparatus for continuously coating a strip of material, such as a web of paper, with a liquid, comprising a support member over which the strip of material is passed in the coating operation, wall means forming a box having at least one open side, said box positioned adjacent said support member so that a portion of the periphery of said support member is located within the range of the open side in said box, means for supplying a coating liquid into the box so that the strip of material passing over said support member contacts the liquid therein, a flexible wiping blade positioned within said box and extending into the range of the open side of said box for providing a wiping action on the strip of material following the completion of its passage in contact with the coating liquid, said wiping blade having a supported edge spaced from said support member and a free edge spaced from and opposite said supported edge with said free edge being in line contact with the strip of material whereby to effect said action, the combination of said wall means, said support member for the strip material and said wiping blade providing a closed chamber containing the coating liquid, and means in communication with said closed chamber for providing differential pressure conditions between the interior of said closed chamber and the exterior of said closed chamber with lower pressure conditions within the interior of said closed chamber, said wiping blade arranged to be exposed to the differential pressure conditions for biasing said wiping blade into contact with the strip material as it passes over said support member, and said means for varying the angle between said wiper blade and the strip of material comprises a portion of the closed chamber wall having the shape of a circular arc, and a part secured to said supported edge of said wiper blade spaced from said support member and having the shape of a circular arc complementary to and movably mounted on said base arcuate wall portion, and means disposed within the chamber defining a pivotably adjustable spillway for regulating the level of the coating liquid therein, and further means comprised of a bottom portion of the chamber wall providing a preliminary smoothing and compressing action on the strip, said further means comprising a flexible blade member disposed in a biased contact with said strip as it commences its passage through the closed chamber.
- 8. Apparatus, as set forth in claim 7, wherein said contact of the second plate member is at a linear plate edge.
- 9. Apparatus, as set forth in claim 7, wherein said means for regulating the level of the coating liquid comprises a pivotally mounted spreader pipe arranged to supply the coating liquid into said closed chamber, and a pair of flanges secured to and extending from opposite sides of said pipe with one of said flanges arranged to form a seal with the lower surface of said closed chamber and the other one of said flanges arranged to form a spillway defining the upper level of the liquid within said closed chamber.
- 10. Apparatus, as set forth in claim 7, wherein the front edge of the second blade extends beyond a sealing contact thereof with the strip on said support member and in the opposite direction to which the strip of material passes over said support member as it moves through said closed chamber.
- 11. Apparatus, as set forth in claim 10, wherein said wall means includes a stationary slip plate having one edge adjacent said support member with said slip plate extending outwardly therefrom above the liquid level within said closed chamber and said slip plate defining an enclosing part of said closed chamber, so that after the strip of material supported on said support member passes upwardly above the level of the coating liquid it travels along and in contact with the surface of said slip plate until it leaves said closed chamber, and said wiping blade contacting the strip of material as it passes over said slip plate.
- 12. Apparatus, as set forth in claim 11, wherein said chamber forms a sump for receiving the coating liquid flowing over said spillway.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7315528 |
Nov 1973 |
SEX |
|
7409968 |
Aug 1974 |
SEX |
|
Parent Case Info
This is a division of application Ser. No. 523,051 filed Nov. 12, 1974, now abandoned.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
Country |
Parent |
523051 |
Nov 1974 |
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