US3701335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating apparatus for sheet material
Assignee: Feldmuehle AG
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Filing: 1971-02-12
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Granted: 1972-10-31
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Expires: 1991-02-12
Abstract
Abstract In an apparatus in which the thickness of a coating on sheet material is controlled by passing the material between a backing roll and a thin, rotating rod of a doctor blade assembly, the rod is rotatably embedded in a confined body of elastomeric polyurethane or synthetic rubber. A circumferential portion of the rod is exposed between two lips of the body which is under compressive stress between the confining walls and the rod. Lubricant and cooling liquid is fed to an axial groove open toward the receptacle of the body, mainly discharged axially from the groove and partly withdrawn by suction from another groove circumferentially spaced from the first groove in the direction of rod rotation.
Inventors
- 👤 Wolfgang Barnscheidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/08; D21H25/12; B; B05; B05C; B05C11/00; B05C11/02; B05C11/023; B05C11/025; D21H5/00; D21H5/0005; D21H5/006; D21H5/0062; D21H5/0067
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
226 words
In a coating apparatus for paper and like sheet material including a rotatable backing roll and a doctor blade assembly axially coextensive with the roll, said assembly including an elongated rod member and a holder arrangement supporting the rod member for rotation about an axis extending in the direction of elongation of said rod member and substantially parallel to the axis of said roll while sheet material backed by said roll is engaged by said rod member, the improvement which comprises: a. wall means in said holder arrangement defining a guide channel open toward said roll; and b. a body of elastomeric material conformingly received in said channel, 1. said body defining therein a receptacle elongated in said direction and transversely open toward said roll, said receptacle conformingly receiving said rod member, 2. the transverse dimensions of said receptacle in the absence of said rod member being smaller than the corresponding dimensions of said rod member in such a manner that said body is under compressive stress between said wall means and said rod member, 3. said body having two lip portions elongated in said direction, said lip portions bounding the open side of said receptacle, and a face in said receptacle connecting said lip portions, 4. the circumferential width of said face relative to said axis of the rod member being substantially greater than 180*.
Claim 2
Dependent Claim
226 words
In a coating apparatus for paper and like sheet material including a rotatable backing roll and a doctor blade assembly axially coextensive with the roll, said assembly including an elongated rod member and a holder arrangement supporting the rod member for rotation about an axis extending in the direction of elongation of said rod member and substantially parallel to the axis of said roll while sheet material backed by said roll is engaged by said rod member, the improvement which comprises: a. wall means in said holder arrangement defining a guide channel open toward said roll; and b. a body of elastomeric material conformingly received in said channel, 1. said body defining therein a receptacle elongated in said direction and transversely open toward said roll, said receptacle conformingly receiving said rod member, 2. the transverse dimensions of said receptacle in the absence of said rod member being smaller than the corresponding dimensions of said rod member in such a manner that said body is under compressive stress between said wall means and said rod member, 3. said body having two lip portions elongated in said direction, said lip portions bounding the open side of said receptacle, and a face in said receptacle connecting said lip portions, 4. the circumferential width of said face relative to said axis of the rod member being substantially greater than 180*.
Claim 3
Dependent Claim
42 words
the transverse dimensions of said receptacle in the absence of said rod member being smaller than the corresponding dimensions of said rod member in such a manner that said body is under compressive stress between said wall means and said rod member,
Claim 4
Dependent Claim
42 words
the transverse dimensions of said receptacle in the absence of said rod member being smaller than the corresponding dimensions of said rod member in such a manner that said body is under compressive stress between said wall means and said rod member,
Claim 5
Dependent Claim
72 words
In an apparatus as set forth in claim 1, said face being formed with one groove adjacent one of said lip portions and remote from the other lip portion, and with another groove adjacent said other lip portion and remote from said one lip portion, said grooves being eloNgated in said direction, means for supplying a liquid to said one groove, and suction means for withdrawing said liquid from said other groove.
Claim 6
Dependent Claim
47 words
In an apparatus as set forth in claim 1, the resiliency of said elastomeric material being sufficient to permit said rod member to be withdrawn between said lip portions through the open side of said receptacle, and to be inserted between said lip portions into said receptacle.
Claim 7
Dependent Claim
30 words
said body having two lip portions elongated in said direction, said lip portions bounding the open side of said receptacle, and a face in said receptacle connecting said lip portions,
Claim 8
Dependent Claim
30 words
said body having two lip portions elongated in said direction, said lip portions bounding the open side of said receptacle, and a face in said receptacle connecting said lip portions,
Claim 9
Dependent Claim
19 words
the circumferential width of said face relative to said axis of the rod member being substantially greater than 180*.
Claim 10
Dependent Claim
19 words
the circumferential width of said face relative to said axis of the rod member being substantially greater than 180*.
Claim 11
Dependent Claim
30 words
In an apparatus as set forth in claim 2, said other lip portion having an acutely angular edge bounding said other groove, the other groove tapering transversely toward said receptacle.
Claim 12
Dependent Claim
52 words
In an apparatus as set forth in claim 2, said lip portions having respective oppositely spaced edges, said edges and said grooves circumferentially bounding respective marginal portions of said face, the circumferential width of said face between said grooves being at least equal to the combined circumferential width of said marginal portions.
Claim 13
Dependent Claim
18 words
In an apparatus as set forth in claim 1, said body essentially consisting of polyurethane or synthetic rubber.
Claim 14
Dependent Claim
64 words
In an apparatus as set forth in claim 1, said roll having a substantially rigid core and two radially superposed layers of elastomeric coating material on said core, the material of the outer layer being substantially harder than the material of the inner layer, and the radial thickness of the inner layer being four to ten times the radial thickness of the outer layer.
Claim 15
Dependent Claim
25 words
In an apparatus as set forth in claim 7, said thickness of the outer layer being substantially smaller than the radius of said rod member.
Claim 16
Dependent Claim
31 words
In an apparatus as set forth in claim 1, a plurality of pneumatic motor means on said wall means yieldably urging said body to move in said channel toward said roll.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |