US3849904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal flat bed through drying system
Assignee: Aer Corp
•
Filing: 1973-04-04
•
Granted: 1974-11-26
•
Expires: 1993-04-04
Abstract
Abstract A horizontal flat bed through drier system for drying a wet web of fibrous material in which air heated directly by burners in the supply ducts is fed to the upper sections of a series of drier units and is drawn through the web and through an airpervious supporting fabric by suction means connected to the lower sections of the units as the web is carried successively through the units by the fabric and in which air removed from at least one unit adjacent to the dry end of the system is reheated and is supplied to another unit relatively adjacent to the wet end of the system and in which exhaust air from the system is brought into direct heat exchange relationship with fresh air being supplied to the system. Each unit includes adjustable edge deckles forming seals with the underside of the fabric edges and with means providing adjustable fabric edge air curtains for cooling the fabric edges. Means is provided for diverting the heated supply air to the exhaust when the fabric temperature exceeds a predetermined value. At least the unit adjacent to the dry end of the system is provided with suction moisture profile control means.
Inventors
- 👤 J Villalobos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:34
CPC Classifications
F; F26; F26B; F26B23/00; F26B23/001; F26B23/002; D; D21; D21F; D21F5/00; F26B13/00; F26B13/10; F26B13/101; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
149 words
A system for drying a wet web of fibrous material including in combination, a plurality of drier units each including an air input section and an air outlet section, means mounting said units in series between a wet web end of said system and a dry web end thereof, a support of air pervious material for carrying said web through said units between said sections in a direction from said wet end to said dry end, means for supplying heated fresh air to the input section of one of said units relatively adjacent to said dry end of said system, means independent of said fresh air supplying means for recycling air from the outlet section of said one unit directly to the input section of another unit relatively adjacent to said wet end of said system, and means for removing air from the outlet section of said other unit.
Claim 2
Independent Claim
149 words
A system for drying a wet web of fibrous material including in combination, a plurality of drier units each including an air input section and an air outlet section, means mounting said units in series between a wet web end of said system and a dry web end thereof, a support of air pervious material for carrying said web through said units between said sections in a direction from said wet end to said dry end, means for supplying heated fresh air to the input section of one of said units relatively adjacent to said dry end of said system, means independent of said fresh air supplying means for recycling air from the outlet section of said one unit directly to the input section of another unit relatively adjacent to said wet end of said system, and means for removing air from the outlet section of said other unit.
Claim 3
Dependent Claim
98 words
A system as in claim 1 in which said plurality of units comprises four units mounted in sequence between said wet end and said dry end and in which said one unit is the fourth unit and said other unit is the second unit, said system including means for supplying heated fresh air to the third unit, means independent of said fresh air supplying means for recycling air from the outlet section of said third unit directly to the input section of said first unit, and means for removing air from the outlet section of the first unit.
Claim 4
Dependent Claim
69 words
A system as in claim 2 in which said means for supplying heated fresh air to said fourth unit comprises means for passing fresh air into indirect heat exchange relationship with air removed from said second unit and which said means for supplying heated fresh air to said third unit comprises means for passing fresh air into indirect heat exchange relationship with air being removed from said first unit.
Claim 5
Dependent Claim
52 words
A system as in claim 1 in which said one unit and said other unit are immediately adjacent to each other, said system including means for passing air removed from the unit at said wet end into indirect heat exchange relationship with air being supplied to the unit at said dry end.
Claim 6
Dependent Claim
35 words
A system as in claim 1 in said supplying and removal means comprise means for passing air removed from one of said units in heat exchange relationship with fresh air being fed to another unit.
Claim 7
Dependent Claim
23 words
A system as in claim 1 including means responsive to the temperature adjacent to said support for exhausting air supplied to said units.
Claim 8
Dependent Claim
17 words
A system as in claim 1 including moisture profile control means associated with one of said units.
Claim 9
Dependent Claim
54 words
A system as in claim 1 including moisture profile control means associated with one of said units, said moisture profile control means comprising means for dividing the outlet section of said one unit into a plurality of subsections across the width of said support and a plurality of adjustable dampers associated with said subsections.
Claim 10
Dependent Claim
31 words
A system as in claim 1 in which the edges of said support extend beyond the edges of said web, said system including means for cooling the edges of said support.
Claim 11
Dependent Claim
47 words
A system as in claim 1 in which the edges of said support extend beyond the edges of said web, said system including means for cooling the edges of said support, said cooling means comprising means forming curtains of aiR directed onto the edges of said support.
Claim 12
Dependent Claim
64 words
A system as in claim 1 in which the edges of said support extend beyond the edges of said web, said system including means for cooling the edges of said support, said cooling means comprising means forming curtains of air directed onto the edges of said support, and means for adjusting the position of said curtains with reference to the centerline of said support.
Claim 13
Dependent Claim
22 words
A system as in claim 1 in which each of said units includes air distributing means located in the outlet section thereof.
Claim 14
Dependent Claim
22 words
A system as in claim 1 including a respective perforated air distributing plate in the outlet section of each of said units.
Claim 15
Dependent Claim
37 words
A system as in claim 1 including a respective perforated air distributing plate in the outlet section of each of said units and a respective second air distributing perforated plate in the inlet section of each unit.
Claim 16
Dependent Claim
24 words
A system as in claim 1 in which each of said units comprises respective edge deckles forming seals with the edges of said supports.
Claim 17
Dependent Claim
42 words
A system as in claim 1 in which each of said units comprises respective edge deckles forming seals with the edges of said supports and means for adjusting the positions of said edge deckles with respect to the centerline of said support.
Claim 18
Dependent Claim
37 words
A system as in claim 1 in which each of said units comprises a plurality of spaced elongated stationary rods extending across said unit for carrying said support in the course of its passage through said unit.
Claim 19
Dependent Claim
44 words
A system as in claim 1 in which each of said units comprises a plurality of spaced elongated stationary rods extending across said unit for carrying said support in the course of its passage through said unit and means for rotatably adjusting said rods.
Claim 20
Dependent Claim
24 words
A system as in claim 1 in which said supplying means comprises ducts connected to said inlet sections and heaters located in said ducts.
Claim 21
Dependent Claim
107 words
A drier unit for use in a system for drying a wet web of fibrous material including in combination an upper section, a lower section, a flexible air pervious fabric for carrying said web through said unit between said sections, a plurality of elongated stationary elements extending across said lower section and in spaced relationship therealong for supporting said fabric in the course of its movement through the unit, means for supplying heated air to the upper section, and means for removing air from the lower section to cause air supplied to the upper section to pass through said web and said fabric to dry said web.
Claim 22
Dependent Claim
107 words
A drier unit for use in a system for drying a wet web of fibrous material including in combination an upper section, a lower section, a flexible air pervious fabric for carrying said web through said unit between said sections, a plurality of elongated stationary elements extending across said lower section and in spaced relationship therealong for supporting said fabric in the course of its movement through the unit, means for supplying heated air to the upper section, and means for removing air from the lower section to cause air supplied to the upper section to pass through said web and said fabric to dry said web.
Claim 23
Dependent Claim
25 words
A drier unit as in claim 20 in which said elements are generally cylindrical rods and means for rotatably adjusting the position of said rods.
Claim 24
Dependent Claim
19 words
A drier unit as in claim 20 including respective air distribution plates extending across said upper and lower sections.
Claim 25
Dependent Claim
32 words
A drier unit as in claim 20 in which said fabric extends beyond the edges of said web and respective means for cooling the edges of said fabric beyond the web edges.
Claim 26
Dependent Claim
48 words
A drier unit as in claim 20 in which said fabric extends beyond the edges of said web and respective means for cooling the edges of said fabric beyond the web edges, said cooling means comprising means for directing respective curtains of cooling air onto said fabric edges.
Claim 27
Dependent Claim
65 words
A drier unit as in claim 20 in which said fabric extends beyond the edges of said web and respective means for cooling the edges of said fabric beyond the web edges, said cooling means comprising means for directing respective curtains of cooling air onto said fabric edges, and means for adjusting the positions of said curtains with respect to the centerline of said fabric.
Claim 28
Dependent Claim
33 words
A drier unit as in claim 20 including edge deckles carried by said lower section adapted to form a seal with the underside of said fabric adjacent to the edges of said web.
Claim 29
Dependent Claim
51 words
A drier unit as in claim 20 including edge deckles carried by said lower section adapted to form a seal with the underside of said fabric adjacent to the edges of said web and means for adjuSting the positions of said edge deckles with respect to the centerline of said fabric.
Claim 30
Dependent Claim
70 words
A drier unit as in claim 20 in which said fabric extends beyond the edges of said web, said unit including means carried by said upper section for directing cooling air curtains onto the upper surface of said fabric adjacent to the edges of said web and respective edge deckles carried by the lower section adapted to form seals with the underside of said fabric adjacent to the web edges.
Claim 31
Dependent Claim
104 words
A drier unit as in claim 20 in which said fabric extends beyond the edges of said web, said unit including means carried by said upper section for directing cooling air curtains onto the upper surface of said fabric adjacent to the edges of said web and respective edge deckles carried by the lower section adapted to form seals with the underside of said fabric adjacent to the web edges, and means for adjusting the position of said curtains with respect to the centerline of said fabric and means for adjusting the positions of said deckles with respect to the centerline of said fabric.
Claim 32
Dependent Claim
51 words
A drier unit as in claim 20 including a plurality of partitions spaced across said lower section for dividing said section into a plurality of subsections, respective dampers associated with said section and means for adjusting said dampers to achieve a desired moisture profile control across the width of said web.
Claim 33
Dependent Claim
126 words
A drier unit for use in a system for drying a wet web of fibrous material including in combination, an upper section, a lower section, a flexible air pervious fabric for carrying said web through said unit between said sections, said fabric extending beyond the edges of said web, means for supplying heated air to said upper section, means for removing air from said lower section to cause air supplied to said upper section to pass through said web and said fabric to dry said web, means carried by said upper section for directing curtains of cooling fluid onto the upper surface of said fabric adjacent to the web edges, and respective edge deckles forming seals with the underside of said fabric adjacent the web edges.
Claim 34
Dependent Claim
126 words
A drier unit for use in a system for drying a wet web of fibrous material including in combination, an upper section, a lower section, a flexible air pervious fabric for carrying said web through said unit between said sections, said fabric extending beyond the edges of said web, means for supplying heated air to said upper section, means for removing air from said lower section to cause air supplied to said upper section to pass through said web and said fabric to dry said web, means carried by said upper section for directing curtains of cooling fluid onto the upper surface of said fabric adjacent to the web edges, and respective edge deckles forming seals with the underside of said fabric adjacent the web edges.
Claim 35
Dependent Claim
17 words
A drier unit as in claim 31 including an air distributing plate extending across said lower section.
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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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |