US3766756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum impregnating apparatus for treating webs
Assignee: Sir James Farmer Norton and Co Ltd
•
Filing: 1972-02-07
•
Granted: 1973-10-23
•
Expires: 1992-02-07
Abstract
Abstract A vacuum impregnating apparatus in which cloth is passed firstly past a vacuum unit which removes air from the cloth interstices. The evacuated cloth immediately being presented to an impregnation unit which delivers impregnating liquid into the evacuated cloth. The impregnated cloth is then subjected either to the action of a squeezing nip or suction unit to remove excess impregnating liquid.
Inventors
- 👤 G Farrar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:18
CPC Classifications
D; D06; D06B; D06B1/00; D06B1/10; D06B1/14; D06B1/144; D06B21/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
100 words
Apparatus for use in the impregnation treatment of a textile or other web with a fluid, the apparatus comprising a vacuum chamber having a slot or other opening past which a web can be moved, an impregnation bath immediately after the vacuum chamber, an impervious, vacuum-sealing belt, band or the like for moving the web past the vacuum slot closely adjacent thereto and past or through the impregnating bath, and a porous member disposed immediately adjacent the vacuum chamber and the impregnation bath and between them and the impervious belt to define with the latter a path for the web.
Claim 2
Dependent Claim
100 words
Apparatus for use in the impregnation treatment of a textile or other web with a fluid, the apparatus comprising a vacuum chamber having a slot or other opening past which a web can be moved, an impregnation bath immediately after the vacuum chamber, an impervious, vacuum-sealing belt, band or the like for moving the web past the vacuum slot closely adjacent thereto and past or through the impregnating bath, and a porous member disposed immediately adjacent the vacuum chamber and the impregnation bath and between them and the impervious belt to define with the latter a path for the web.
Claim 3
Dependent Claim
44 words
Apparatus as claimed in claim 1, in whiCh the impregnation bath has an impregnating medium outlet opening on to the porous member between which and the vacuum sealing belt the web can be moved in close contact with said outlet by the vacuum-sealing belt.
Claim 4
Dependent Claim
47 words
Apparatus as claimed in claim 1, in which the porous member is a porous flexible metal cylinder within which is located stationarily in tandem the vacuum chamber and the impregnation bath, whereof the vacuum slot or opening and the impregnation outlet are closely adjacent to one another.
Claim 5
Dependent Claim
80 words
Apparatus as claimed in claim 3, in which the porous metal cylinder houses internally a tube subdivided internally along the axis of the cylinder by a partition to form the vacuum chamber and the impregnation bath and is closed at its bottom by a wearing plate bearing on the internal surface of the cylinder and constituting the bottom of the vacuum chamber and the impregnation bath, the wearing plate being apertured to provide the vacuum opening and the impregnation outlet.
Claim 6
Dependent Claim
17 words
Apparatus as claimed in claim 4, in which the impregnation outlet is defined by an elongate slot.
Claim 7
Dependent Claim
23 words
Apparatus as claimed in claim 5, in which the slot connects the tops of a row of holes formed in the wearing plate.
Claim 8
Dependent Claim
90 words
Apparatus as claimed in claim 4, in which the vacuum opening is defined by two rows of holes in the wearing plate with the holes of one row staggered relative to the holes of the other row and with the bottoms of the holes in one of the rows merging in a elongate slot at their trailing edges in the direction of movement of the web, while the holes in the other row merge in an elongate slot at their leading edges in the direction of movement of the web.
Claim 9
Dependent Claim
17 words
Apparatus as claimed in claim 4, in which the wearing plate is formed of high density polyethylene.
Claim 10
Dependent Claim
57 words
Apparatus as claimed in claim 3, in which the porous metal cylinder is constituted by thin flexible mesh material and is supported at its ends by annular mounting and bearing assemblies, one of which is position stationary and one of which is axially movable by spring means axially to tension the flexible porous cylinder and prevent sag.
Claim 11
Dependent Claim
45 words
Apparatus as claimed in claim 3, in which the vacuum sealing belt extends around an arc of the porous cylinder, the belt being endless and passing around a pair of rollers, one of which is movable for tensioning said belt while the other is driven.
Claim 12
Dependent Claim
29 words
Apparatus as claimed in claim 10, comprising a prime mover driving the belt roller via an endless belt, which belt also drives the porous cylinder via a gear train.
Claim 13
Dependent Claim
78 words
Apparatus as claimed in claim 1, in which the impregnation bath is part of a recirculatory circuit including a liquor supply tank connected to the impregnation bath for feeding liquor to the impregnation bath, a liquor level tank also connected to the impregnation bath to ensure topping up of the latter and a drip through under the impregnation bath and vacuum sealing belt to collect excess liquor, the impregnating liquor being fed gravitationally out of the impregnation bath.
Claim 14
Dependent Claim
23 words
Apparatus as claimed in claim 1, in which the vacuum chamber is connected to a high vacuum pump via a high vacuum receiver.
Claim 15
Dependent Claim
23 words
Apparatus as claimed in claim 1, and further comprising, after the impregnation bath, a squeezing nip to remove excess liquor from the web.
Claim 16
Dependent Claim
36 words
Apparatus as claimed in claim 1, and further comprising, after the impregnation bath, a suction pump connected to a suction box via a suction receiver, which further apparatus serves to remove excess liquor from the web.
Claim 17
Dependent Claim
43 words
Apparatus as claimed in claim 1 in which, when the apparatus is used with solvents, the vacuum-sealing belt, porous member, vacuum chamber, and impregnation bath are enclosed in a casing closed by hinged covers, and the casing is connected to a solvent extractor.
Claim 18
Dependent Claim
60 words
Apparatus as claimed in claim 1 in which the vacuum chamber is a vacuum tube with a vacuum slot, the porous member is a driven endless pervious belt surrounding the vacuum tube, and the impervious belt arcs arouNd the vacuum tube in the region of the vacuum slot and defines with the wall of the vacuum tube the impregnating bath.
References Cited (Backward Citations)
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |