US4945855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coater
Assignee: Valmet Technologies Oy
•
Filing: 1988-10-24
•
Granted: 1990-08-07
•
Expires: 2008-10-24
Abstract
Abstract A coater for coating a running paper or carboard web comprises a coating chamber having one side open against the web and means for filling the coating chamber with pressurized coating substance. The coating chamber is limited in the longitudinal direction of the web by a web entrance wall, and opposite thereof, a back wall in the form of a doctor member for forming a coating layer on the web. The distance between the walls is so short that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.3 s, preferably at the most 0.03 s. Coating substance is supplied by means of positive pressure to the coating chamber at a position close to the web entrance wall. Close to the web entrance wall the flow of coating substance in the coating chamber is divided into two branches, of which a first branch follows the web in its running direction towards the back wall and a second branch, which is considerably greater than the first branch, flows out from the coating chamber through a slot between the web entrance wall and the web.
Inventors
- 👤 Dan Eklund
- 👤 Sivert Westergard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:52
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/32; D21H23/40; B; B05; B05C; B05C11/00; B05C11/02; B05C11/04; D21H5/00; D21H5/0005; D21H5/0012; D21H5/0015
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
478 words
A coater for coating a running paper or cardboard web, comprising: wall means defining a coating chamber having an inlet end and an opposite outlet end, the chamber having an inlet opening at its inlet end for introducing coating substance into the chamber and being open against the web at its outlet end, the wall means including a web entrance wall that bounds the chamber in the upstream direction with respect to the path of movement of the web and is spaced from the web so as to define a slot for the web to enter the chamber, and a back wall structure that bounds the chamber in the opposite, downstream direction, said back wall structure including a doctor member that engages the web for forming a coating layer on the web, the distance between the web entrance wall and the doctor member at the outlet end of the chamber being such that, at normal web running speed, the web moves from the entrance wall to the doctor member in a time of at most 0.3 s, and the inlet opening being closer to the web entrance wall than to the back wall structure, whereby the flow of coating substance introduced into the coating chamber by way of the inlet opening is, at a position close to the web entrance wall, divided into two branches, of which a first branch follows the web in its running direction toward the back wall structure and a second branch, which is of a considerably greater volume flow rate than the first branch, flows out from the coating chamber through the slot, a partition wall located in said coating chamber between the web entrance wall and the back wall structure and spaced from the web, said partition wall defining passageways for the coating substance in said chamber, thereby leading the flow in said chamber, firstly, mainly along said web entrance wall, thereafter in the direction of the movement of the web, and thereafter along said back wall structure of the coating chamber away from the web, there being a throttled passage in the flow path of the coating substance at the web entrance wall side of the partition wall, and there being a pressure equalizing opening in the partition wall connecting the region of the coating chamber that is between the back wall structure and the partition wall with the region of the coating chamber that is between the web entrance wall and the partition wall and is immediately downstream of the throttled passage, and supply means connected to the inlet opening of the coating chamber for delivering pressurized coating substance into the coating chamber, the slot defined between the web entrance wall and the web being sufficiently narrow to limit the flow of coating substance from the coating chamber and thereby maintain the coating substance in the coating chamber under pressure.
Claim 2
Dependent Claim
478 words
A coater for coating a running paper or cardboard web, comprising: wall means defining a coating chamber having an inlet end and an opposite outlet end, the chamber having an inlet opening at its inlet end for introducing coating substance into the chamber and being open against the web at its outlet end, the wall means including a web entrance wall that bounds the chamber in the upstream direction with respect to the path of movement of the web and is spaced from the web so as to define a slot for the web to enter the chamber, and a back wall structure that bounds the chamber in the opposite, downstream direction, said back wall structure including a doctor member that engages the web for forming a coating layer on the web, the distance between the web entrance wall and the doctor member at the outlet end of the chamber being such that, at normal web running speed, the web moves from the entrance wall to the doctor member in a time of at most 0.3 s, and the inlet opening being closer to the web entrance wall than to the back wall structure, whereby the flow of coating substance introduced into the coating chamber by way of the inlet opening is, at a position close to the web entrance wall, divided into two branches, of which a first branch follows the web in its running direction toward the back wall structure and a second branch, which is of a considerably greater volume flow rate than the first branch, flows out from the coating chamber through the slot, a partition wall located in said coating chamber between the web entrance wall and the back wall structure and spaced from the web, said partition wall defining passageways for the coating substance in said chamber, thereby leading the flow in said chamber, firstly, mainly along said web entrance wall, thereafter in the direction of the movement of the web, and thereafter along said back wall structure of the coating chamber away from the web, there being a throttled passage in the flow path of the coating substance at the web entrance wall side of the partition wall, and there being a pressure equalizing opening in the partition wall connecting the region of the coating chamber that is between the back wall structure and the partition wall with the region of the coating chamber that is between the web entrance wall and the partition wall and is immediately downstream of the throttled passage, and supply means connected to the inlet opening of the coating chamber for delivering pressurized coating substance into the coating chamber, the slot defined between the web entrance wall and the web being sufficiently narrow to limit the flow of coating substance from the coating chamber and thereby maintain the coating substance in the coating chamber under pressure.
Claim 3
Dependent Claim
43 words
A coater according to claim 1, wherein the supply means include an inlet conduit that terminates at said inlet opening, said inlet conduit being oriented to introduce coating substance into the coating chamber in a direction substantially parallel to the web entrance wall.
Claim 4
Dependent Claim
47 words
A coater according to claim 1, wherein the distance between the web entrance wall and the back wall is such that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.03 s.
Claim 5
Dependent Claim
24 words
A coater according to claim 1, in which said slot between said web entrance wall and said web converges in the web running direction.
Claim 6
Dependent Claim
34 words
A coater according to claim 1, wherein the position of the partition wall is adjustable in a manner such as to influence the height of a slot between the partition wall and the web.
Claim 7
Dependent Claim
29 words
A coater according to claim 1, in which there is a wider slot between the web entrance wall and the web than between the partition wall and the web.
Claim 8
Dependent Claim
23 words
A coater according to claim 1, in which said coating chamber has an outlet opening adjacent to the back wall of the chamber.
Claim 9
Dependent Claim
25 words
A coater according to claim 7, in which a duct is connected to said outlet opening, said duct comprising a passage with adjustable throttling means.
Claim 10
Dependent Claim
49 words
A coater according to claim 1, in which there is, outside the coating chamber in front of the web entrance wall, a wall forming together with the web entrance wall a flow duct for coating substance flowing out through the slot between the web entrance wall and the web.
Claim 11
Dependent Claim
26 words
A coater according to claim 9, comprising means for maintaining a partial vacuum in the flow duct outside the web entrance wall of the coating chamber.
Claim 12
Dependent Claim
446 words
A coater for coating a running paper or cardboard web, comprising: wall means defining a coating chamber having an inlet end and an opposite outlet end, the chamber having an inlet opening at its inlet end for introducing coating substance into the chamber and being open against the web at its outlet end, the wall means including a web entrance wall that bounds the chamber in the upstream direction with respect to the path of movement of the web and its spaced from the web so as to define a slot for the web to enter the chamber, and a back wall structure that bounds the chamber in the opposite, downstream direction, said back wall structure including a doctor member that engages the web for forming a coating layer on the web, the distance between the web entrance wall and the doctor member at the outlet end of the chamber being such that, at normal web running speed, the web moves from the entrance wall to the doctor member in a time of at most 0.3 s, and the inlet opening being closer to the web entrance wall than to the back wall structure, whereby the flow of coating substance introduced into the coating chamber by way of the inlet opening is, at a position close to the web entrance wall, divided into two branches, of which a first branch follows the web in its running direction toward the back wall structure and a second branch, which is of a considerably greater volume flow rate than the first branch, flows out from the coating chamber through the slot, a partition wall located in said coating chamber between the web entrance wall and the back wall structure and spaced from the web, said partition wall defining passageways for the coating substance in said chamber, thereby leading the flow in said chamber, firstly, mainly along said web entrance wall, thereafter in the direction of the movement of the web, and thereafter along said back wall structure of the coating chamber away from the web, there being a pressure equalizing opening in the partition wall connecting the region of the coating chamber that is between the back wall structure and the partition wall with the region of the coating chamber that is between the web entrance wall and the partition wall, and supply means connected to the inlet opening of the coating chamber for delivering pressurized coating substance into the coating chamber, the slot defined between the web entrance wall and the web being sufficiently narrow to limit the flow of coating substance from the coating chamber and thereby maintain the coating substance in the coating chamber under pressure.
Claim 13
Dependent Claim
446 words
A coater for coating a running paper or cardboard web, comprising: wall means defining a coating chamber having an inlet end and an opposite outlet end, the chamber having an inlet opening at its inlet end for introducing coating substance into the chamber and being open against the web at its outlet end, the wall means including a web entrance wall that bounds the chamber in the upstream direction with respect to the path of movement of the web and its spaced from the web so as to define a slot for the web to enter the chamber, and a back wall structure that bounds the chamber in the opposite, downstream direction, said back wall structure including a doctor member that engages the web for forming a coating layer on the web, the distance between the web entrance wall and the doctor member at the outlet end of the chamber being such that, at normal web running speed, the web moves from the entrance wall to the doctor member in a time of at most 0.3 s, and the inlet opening being closer to the web entrance wall than to the back wall structure, whereby the flow of coating substance introduced into the coating chamber by way of the inlet opening is, at a position close to the web entrance wall, divided into two branches, of which a first branch follows the web in its running direction toward the back wall structure and a second branch, which is of a considerably greater volume flow rate than the first branch, flows out from the coating chamber through the slot, a partition wall located in said coating chamber between the web entrance wall and the back wall structure and spaced from the web, said partition wall defining passageways for the coating substance in said chamber, thereby leading the flow in said chamber, firstly, mainly along said web entrance wall, thereafter in the direction of the movement of the web, and thereafter along said back wall structure of the coating chamber away from the web, there being a pressure equalizing opening in the partition wall connecting the region of the coating chamber that is between the back wall structure and the partition wall with the region of the coating chamber that is between the web entrance wall and the partition wall, and supply means connected to the inlet opening of the coating chamber for delivering pressurized coating substance into the coating chamber, the slot defined between the web entrance wall and the web being sufficiently narrow to limit the flow of coating substance from the coating chamber and thereby maintain the coating substance in the coating chamber under pressure.
Claim 14
Dependent Claim
43 words
A coater according to claim 11, wherein the supply means include an inlet conduit that terminates at said inlet opening, said inlet conduit being oriented to introduce coating substance into the coating chamber in a direction substantially parallel to the web entrance wall.
Claim 15
Dependent Claim
34 words
A coater according to claim 11, wherein the position of the partition wall is adjustable in a manner such as to influence the height of a slot between the partition wall and the web.
Claim 16
Dependent Claim
29 words
A coater according to claim 11, in which there is a wider slot between the web entrance wall and the web than between the partition wall and the web.
Claim 17
Dependent Claim
23 words
A coater according to claim 11, in which said coating chamber has an outlet opening adjacent to the back wall of the chamber.
Claim 18
Dependent Claim
25 words
A coater according to claim 15, in which a duct is connected to said outlet opening, said duct comprising a passage with adjustable throttling means.
Claim 19
Dependent Claim
359 words
A coater for coating a running paper or cardboard web, comprising: wall means defining a coating chamber having an inlet end and an opposite outlet end, the chamber having an inlet opening at its inlet end for introducing coating substance into the chamber and being open against the web at its outlet end, the wall means including a web entrance wall that bounds the chamber in the upstream direction with respect to the path of movement of the web and is spaced from the web so as to define a slot for the web to enter the chamber, and a back wall structure that bounds the chamber in the opposite, downstream direction, said back wall structure including a doctor member that engages the web for forming a coating layer on the web, the distance between the web entrance wall and the doctor member at the outlet end of the chamber being such that, at normal web running speed, the web moves from the entrance wall to the doctor member in a time of at most 0.3 s, a partition wall located in said coating chamber between the web entrance wall and the back wall structure and spaced from the web, said partition wall dividing the coating chamber into a first region between the web entrance wall and the partition wall and a second region between the partition wall and the back wall structure, and there being a pressure equalizing opening in the partition wall connecting the first and second regions of the coating chamber, the inlet opening being between the web entrance wall and the partition wall so that coating substance introduced into the coating chamber by way of the inlet opening flows firstly mainly along said web entrance wall, and the flow is divided at a position close to the web entrance wall into a first branch, which follows the web in its direction towards the back wall structure and thereafter flows away from the web along the back wall structure, and a second branch, which is of a considerably greater volume flow rate than the first branch and flows out from the coating chamber through the slot.
Claim 20
Dependent Claim
359 words
A coater for coating a running paper or cardboard web, comprising: wall means defining a coating chamber having an inlet end and an opposite outlet end, the chamber having an inlet opening at its inlet end for introducing coating substance into the chamber and being open against the web at its outlet end, the wall means including a web entrance wall that bounds the chamber in the upstream direction with respect to the path of movement of the web and is spaced from the web so as to define a slot for the web to enter the chamber, and a back wall structure that bounds the chamber in the opposite, downstream direction, said back wall structure including a doctor member that engages the web for forming a coating layer on the web, the distance between the web entrance wall and the doctor member at the outlet end of the chamber being such that, at normal web running speed, the web moves from the entrance wall to the doctor member in a time of at most 0.3 s, a partition wall located in said coating chamber between the web entrance wall and the back wall structure and spaced from the web, said partition wall dividing the coating chamber into a first region between the web entrance wall and the partition wall and a second region between the partition wall and the back wall structure, and there being a pressure equalizing opening in the partition wall connecting the first and second regions of the coating chamber, the inlet opening being between the web entrance wall and the partition wall so that coating substance introduced into the coating chamber by way of the inlet opening flows firstly mainly along said web entrance wall, and the flow is divided at a position close to the web entrance wall into a first branch, which follows the web in its direction towards the back wall structure and thereafter flows away from the web along the back wall structure, and a second branch, which is of a considerably greater volume flow rate than the first branch and flows out from the coating chamber through the slot.
Claim 21
Dependent Claim
43 words
A coater according to claim 17, wherein the supply means include an inlet conduit that terminates at said inlet opening, said inlet conduit being oriented to introduce coating substance into the coating chamber in a direction substantially parallel to the web entrance wall.
Claim 22
Dependent Claim
34 words
A coater according to claim 17, wherein the position of the partition wall is adjustable in a manner such as to influence the height of a slot between the partition wall and the web.
Claim 23
Dependent Claim
29 words
A coater according to claim 17, in which there is a wider slot between the web entrance wall and the web than between the partition wall and the web.
Claim 24
Dependent Claim
41 words
A coater according to claim 17, in which said coating chamber has an outlet opening adjacent to the back wall of the chamber, and a duct is connected to said outlet opening, said duct comprising a passage with adjustable throttling means.
Claim 25
Dependent Claim
49 words
A coater according to claim 17, in which there is, outside the coating chamber in front of the web entrance wall, a wall forming together with the web entrance wall a flow duct for coating substance flowing out through the slot between the web entrance wall and the web.
Claim 26
Dependent Claim
55 words
A coater according to claim 17, in which there is a throttled passage in the flow path of the coating substance at the web entrance wall side of said partition wall, said throttled passage being immediately upstream of the pressure equalizing opening with respect to the flow of coating substance along the web entrance wall.
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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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |