US698134A - Process of drying redwood lumber. - Google Patents
Process of drying redwood lumber. Download PDFInfo
- Publication number
- US698134A US698134A US6866501A US1901068665A US698134A US 698134 A US698134 A US 698134A US 6866501 A US6866501 A US 6866501A US 1901068665 A US1901068665 A US 1901068665A US 698134 A US698134 A US 698134A
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- US
- United States
- Prior art keywords
- lumber
- pressure
- drying
- valves
- redwood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
Definitions
- PETER ca, Pnoroumo. wumncwmp. c.
- This invention relates to the process of drying redwood lumber by application chair or gases saturated with hot water or steam un der pressure and after this treatment withdrawing the sap from its containing wood by means of exhaustion of air or gas and watervapor with a vacuum-pump, and has 'for its object to render the process more expeditious and considerably cheaper.
- I employ, first, an increase of pressure above the normal air-pressure in order to upset the stable equilibrium of contained sap by means of a pressure-pump, and, second, a decrease of pressure below the normal air-pressure to produce a rapid discharge of contained sap from its containing wood by means of a vacuum pump, both in combination with air, gases, and water-vapor.
- A is a drying-chamber with locking-doors at each end and with suitable pressure and vacuum gages attached;
- B B a car-track on which a car loaded with green lumber is introduced into the chamber and removed at the other end after treatment without handling;
- G a steam-supply pipe extending to.
- This gas may be made to still further penetrate the lumber by application of pressure with the pressurepump D, it'required.
- V to V are hand-valves for controlling the various manipulations, reversing their order, omitting or repeating at will, and as shown on drawing will be readily understood and may be stated more in detail, as follows: First, introduce a car of lumber, stowed on edge, into the chamber and securely close the doors. Second, valves 2, 4, 7, and 9 being closed, valves 1, 8, and 5 being open, proceed to exhaust-air from chamber by means of vacuum-pump 0. Third, the air having-been nearly exhausted, valves 1, 4, 6, 7, and 8 be- 'ing closed, valves 9 and 10 being open, introduce chlorin gas, stored in tank E, into the chamber until the vacuum-gage shows one half atmosphere-pressure in the chamber. Thisis to prevent discoloration of surface of lumber by the acid sap.
- valves 1, 2, 5, 7, and 9 being closed, valves 3 and 4 being open, introduce steam from steam-supply G into the chamber until the steam or pressure gage shows'five pounds pressure within the chamber.
- Fifth valves 1, 3, 4, 6, and 9 being closed, valves 2 and 7 being open, operate the pressure -pump D until the pressure -1gage shows a pressure of about eighty pounds in the chamber.
- Sixth allow a period oftime for saturation of lumber varying withthe thickness of same, for lumber one inch thick about one hour.
- valves 2, 4, 7, and 9 being closed, valves 1,3, and 5 being open, operate thevacuum-pump 6 until the vacuum-gage shows asnear a vacuum as is possible to ob tain in the chamber.
Description
No. 698,134. Patented Apr. '22, I902. H. B. PHILLIPS. 4 PROCESS OF DRYING REDWOOD LUMBER.
[Application filed July 17, 1901.)
(No Model.)
TN! mam PETER: ca, Pnoroumo. wumncwmp. c.
UNITED STATES PATENT OF ICE.
HENRY B. PHILLIPS, OF BERKELEY, CA'LIFORNIA..
PROCESS OF DRYING REDWOOD LUMBER.
SPECIFICATION forming part of Letters Patent No. 698,134, dated April 22, 1902. Application filed July 1'7, 1901. Serial No. 68,665. (N Speimena) a citizen of the United stat'es, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful Improvements in Processes of Drying Redwood Lumber,0f which'the following is a specification.
This invention relates to the process of drying redwood lumber by application chair or gases saturated with hot water or steam un der pressure and after this treatment withdrawing the sap from its containing wood by means of exhaustion of air or gas and watervapor with a vacuum-pump, and has 'for its object to render the process more expeditious and considerably cheaper.
In drying redwood lumber the soluble and volatile constituents of the sap are discharged from the wood, and this has hitherto been effected by the action of air, heat, and moisture at the normal pressure of the atmosphere.
Instead of depending solely 'upon the agency of air, heat, and moisture at normal pressure I employ, first, an increase of pressure above the normal air-pressure in order to upset the stable equilibrium of contained sap by means of a pressure-pump, and, second, a decrease of pressure below the normal air-pressure to produce a rapid discharge of contained sap from its containing wood by means of a vacuum pump, both in combination with air, gases, and water-vapor. I attain these objects by the arrangement of apparatus illustrated in the accompanying drawings, in which A is a drying-chamber with locking-doors at each end and with suitable pressure and vacuum gages attached; B B, a car-track on which a car loaded with green lumber is introduced into the chamber and removed at the other end after treatment without handling; G, a steam-supply pipe extending to.
filling the vacant pores of the lumber to the subsequent exclusion of air. This gas may be made to still further penetrate the lumber by application of pressure with the pressurepump D, it'required.
V to V are hand-valves for controlling the various manipulations, reversing their order, omitting or repeating at will, and as shown on drawing will be readily understood and may be stated more in detail, as follows: First, introduce a car of lumber, stowed on edge, into the chamber and securely close the doors. Second, valves 2, 4, 7, and 9 being closed, valves 1, 8, and 5 being open, proceed to exhaust-air from chamber by means of vacuum-pump 0. Third, the air having-been nearly exhausted, valves 1, 4, 6, 7, and 8 be- 'ing closed, valves 9 and 10 being open, introduce chlorin gas, stored in tank E, into the chamber until the vacuum-gage shows one half atmosphere-pressure in the chamber. Thisis to prevent discoloration of surface of lumber by the acid sap. Fourth, valves 1, 2, 5, 7, and 9 being closed, valves 3 and 4 being open, introduce steam from steam-supply G into the chamber until the steam or pressure gage shows'five pounds pressure within the chamber. Fifth, valves 1, 3, 4, 6, and 9 being closed, valves 2 and 7 being open, operate the pressure -pump D until the pressure -1gage shows a pressure of about eighty pounds in the chamber. Sixth, allow a period oftime for saturation of lumber varying withthe thickness of same, for lumber one inch thick about one hour.- Seventh, valves 2, 4, 7, and 9 being closed, valves 1,3, and 5 being open, operate thevacuum-pump 6 until the vacuum-gage shows asnear a vacuum as is possible to ob tain in the chamber. Eighth, allow a period of time for discharge of sap from lumber. No arbitrary time can be stated, as it depends on the character of the1umber,--"the;dense heavy lumber from'butts ot "redwood-trees requiring more time than the lighter more porous lumber from the upp'erlportion of the trunks. It also depends upon thethickness of the lumber and also upon the perfection with which the precedingsteps have been executed. This period of time will vary from two to ten hours. N inth,-valves1, 4, 7, 6,-and 10 being closed, valves Band 9 being, open, admit carbonic-acid gas, stored in tank F, to
the chamber until normal air-pressure is obtained Within. Tenth, allowa period of time for penetration of gas into lumber, for lumher one inch thick two hours and other thicknesses in proportion.
hat I claim as my invention, and desire to secure by Letters Patent, is
The process of drying redwood lumber by application under a mechanicallyinduced pressure of air and gases saturated with water-vapor, followed by exhaustion of gases,
l air, vapor and sap by a mechanically-induced vacuum and the subsequent filling, of the vacuous interstices of the wood with carbonicacid gas, substantially as herein described. i In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. II. B. PHILLIPS.
.Vitnesses:
F. F. FINLAY, J. L. EWEN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6866501A US698134A (en) | 1901-07-17 | 1901-07-17 | Process of drying redwood lumber. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6866501A US698134A (en) | 1901-07-17 | 1901-07-17 | Process of drying redwood lumber. |
Publications (1)
Publication Number | Publication Date |
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US698134A true US698134A (en) | 1902-04-22 |
Family
ID=2766668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US6866501A Expired - Lifetime US698134A (en) | 1901-07-17 | 1901-07-17 | Process of drying redwood lumber. |
Country Status (1)
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2578039A (en) * | 1946-11-21 | 1951-12-11 | Prot Products Mfg Company | Tank for use in impregnating wood |
US3092537A (en) * | 1959-06-05 | 1963-06-04 | Cons Paper Corp Ltd | Flameproofing of organic materials |
-
1901
- 1901-07-17 US US6866501A patent/US698134A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2578039A (en) * | 1946-11-21 | 1951-12-11 | Prot Products Mfg Company | Tank for use in impregnating wood |
US3092537A (en) * | 1959-06-05 | 1963-06-04 | Cons Paper Corp Ltd | Flameproofing of organic materials |
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