US3921309A - Method of drying lumber - Google Patents

Method of drying lumber Download PDF

Info

Publication number
US3921309A
US3921309A US500767A US50076774A US3921309A US 3921309 A US3921309 A US 3921309A US 500767 A US500767 A US 500767A US 50076774 A US50076774 A US 50076774A US 3921309 A US3921309 A US 3921309A
Authority
US
United States
Prior art keywords
chamber
steps
lumber
steam
blowing
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
Application number
US500767A
Other languages
English (en)
Inventor
Kenji Nakayashiki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SEIWA KOSAN Ltd
Original Assignee
SEIWA KOSAN Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SEIWA KOSAN Ltd filed Critical SEIWA KOSAN Ltd
Application granted granted Critical
Publication of US3921309A publication Critical patent/US3921309A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum

Definitions

  • This invention provides an improved method of drying lumber, comprising:
  • FIGS. 1 and 2 each illustrates an apparatus for conducting an embodiment of the invention.
  • This invention has an advantage that the drying steps can be accomplished in one and the same chamber from the beginning to the end.
  • FIGS. 1 and 2 each diagrammatically illustrates an apparatus for conducting an embodiment of the basic concept of the invention.
  • the lumber l to be dried is placed in hermetically sealable chamber 2, and steam is blown through the chamber from the steam blowing pipe 3. Condensed moisture is removed through steam trap 4. This blowing of steam provides a disinfection, but the frequency of conducting this step must be much smaller in comparison with that of the blowing of hot air and vacuum drying presented hereinbelow.
  • the fan 5 is then switched on, and hot air is introduced in the chamber 2 through air heater 6 via hot air conducts 7 and 8.
  • the vacuum pump 9 is switched on to evacuate the chamber 2, through vacuum exhaust 13 via conducts l0 and 11 and condenser 12.
  • the condenser 12, through which cold water is circulated, is arranged in order to effectively collect the vapor in the chamber 2 and lighten the burden of the vacuum pump 9.
  • the hot air can be circulated as shown in FIG. 2.
  • the surface of the lumber is maintained in a damp condition, and therefore, splitting and warping occur less frequently.
  • the air heater 6 may be arranged inside the chamber 2, if desired, FIG. 2 shows air return 14 for recirculation of the hot air.
  • the present invention provides a method of drying lumber, in which vacuum drying can be performed at an extremely low temperature by evacuating a chamber containing the lumber to be dried as highly as possible, after blowing steam and hot air through the chamber to transfer the latent heat of vaporization to the lumber by convection.
  • vacuum drying step is operated at 20 mm Hg (abs)
  • the temperature need only lie above the saturation temperature at that pressure, about 20C.
  • step (1) steps (2) and (3) are repeated alternately three to eight times, preferably four or five times. Step (1) is then repeated, and steps (2) and (3) are repeated as mentioned above. The series of these steps is repeated about four to 20 times in total. Satisfactory results are not obtained due to frequent occurrence of splitting and warping, if step (1) is not operated at regular intervals between the repetition of steps (2) and (3).
  • EXAMPLE 1 One hundred elm boards (90 X 300 X 2000 mm: initial moisture content: 30-60 percent were placed in piles in a chamber 2 of the type described in FIG. 1 having a volume of 30 m at vertical intervals of 3 cm and at horizontal intervals of 1 cm between the boards. The boards were dried according to the following procedures:
  • EXAMPLE 2 Three hundred elm boards (50 X 300 X 2000 mm; initial moisture content: 60-80 percent) were arranged in EXAMPLE 3 Two hundred and fifty elm boards (50 X 380 X 2600 mm; initial moisture content: 100-120 percent) were arranged in a similar manner to the arrangement in Example l in a chamber 2 of the type shown in FIG. 2 having a volume of 90 m The boards were dried according to the following procedures:
  • a method of drying lumber comprising the steps of:
  • step (4) is repeated three to eight times and step (5) is repeated four to 20 times.
  • step (1 said steam is at a temperature of about C and the blowing of said steam is for about 0.5 to 1 hour, in step (2) the blowing is for about 0.5 to 1 hour, and in step (3) said chamber is evacuated to a pressure of about 10 to 60 mm Hg and maintained evacuated for about 0.25 to 2 hours.
  • step (2) said air is circulated.
  • step (1 the steam employed is at a temperature of about 100C such that it is almost saturated with water.
  • step (3) said evacuating is conducted at about 10 to about 60 mm Hg.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US500767A 1973-08-24 1974-08-26 Method of drying lumber Expired - Lifetime US3921309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48095365A JPS5044545A (Direct) 1973-08-24 1973-08-24

Publications (1)

Publication Number Publication Date
US3921309A true US3921309A (en) 1975-11-25

Family

ID=14135587

Family Applications (1)

Application Number Title Priority Date Filing Date
US500767A Expired - Lifetime US3921309A (en) 1973-08-24 1974-08-26 Method of drying lumber

Country Status (3)

Country Link
US (1) US3921309A (Direct)
JP (1) JPS5044545A (Direct)
CA (1) CA1025208A (Direct)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017980A (en) * 1973-04-30 1977-04-19 Kleinguenther Robert A Apparatus and process for treating wood and fibrous materials
FR2422915A1 (fr) * 1978-04-13 1979-11-09 Pagnozzi Vincenzo Procede et installation utilisant un systeme de vapeur surchauffee pour le sechage du bois massif
US4194296A (en) * 1977-05-17 1980-03-25 Pagnozzi Ernesto Guglielmo Vacuum drying kiln
US4233753A (en) * 1979-01-22 1980-11-18 Allwood, Inc. Method for preventing the splitting of logs during drying
US4467532A (en) * 1983-01-06 1984-08-28 Drake Harry W Apparatus and process for drying lumber
WO1986007547A1 (fr) * 1985-06-21 1986-12-31 Gerhard Gergely Procede et dispositif pour la manipulation de materiau de traitement et le produit de reaction fabrique a l'aide du procede et/ou du dispositif
US4781778A (en) * 1983-11-16 1988-11-01 Stig Olofsson Method for manufacturing in wood cases used within the telecommunications industry
FR2614682A1 (fr) * 1987-04-30 1988-11-04 Giuliani Lando Procede et dispositif de sechage d'un corps dans lequel une partie de l'humidite a extraire est retenue dans des cellules fermees
US4876802A (en) * 1983-12-21 1989-10-31 Gerhard Gergely Process and means for the heat treatment of powdery or granulate material
US5392530A (en) * 1991-03-04 1995-02-28 Izumi; Hyogo Method of seasoning lumber
US5578274A (en) * 1994-06-17 1996-11-26 Seidner; Marc A. Shipboard apparatus for heat-treating wood and wood products
KR20030042316A (ko) * 2001-11-22 2003-05-28 한전기공주식회사 급속 건조장치
US20080223360A1 (en) * 2005-10-04 2008-09-18 Basf Se Production of Modified Lignocellulosic Materials
US8291611B2 (en) 2010-06-30 2012-10-23 Eriksen Timothy L Multiple stage even-drying wood kiln system and method
US10627160B2 (en) * 2017-02-09 2020-04-21 Ulvac, Inc. Vacuum drying apparatus and vacuum drying method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5853268B2 (ja) * 1975-09-18 1983-11-28 大塚家具工業株式会社 木材の乾燥方法
JPS5320401A (en) * 1976-08-11 1978-02-24 Fujimi Toshiharu Method of and apparatus for drying woods
JPS53139703A (en) * 1977-05-10 1978-12-06 Toshiharu Fujimi Wood drying method
JPS5930876Y2 (ja) * 1980-08-30 1984-09-03 藤見 敏治 木材の乾燥装置
JPH04132388U (ja) * 1991-05-24 1992-12-08 千住金属工業株式会社 真空乾燥装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1050151A (en) * 1909-06-03 1913-01-14 Loomis Utilization Company Process of drying and seasoning wood.
US1763070A (en) * 1927-10-15 1930-06-10 Shinn Forrest Streator Method of seasoning wood
US1778079A (en) * 1925-11-29 1930-10-14 Fribergs Hogvacuumpump Ab Method of drying wet materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1050151A (en) * 1909-06-03 1913-01-14 Loomis Utilization Company Process of drying and seasoning wood.
US1778079A (en) * 1925-11-29 1930-10-14 Fribergs Hogvacuumpump Ab Method of drying wet materials
US1763070A (en) * 1927-10-15 1930-06-10 Shinn Forrest Streator Method of seasoning wood

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017980A (en) * 1973-04-30 1977-04-19 Kleinguenther Robert A Apparatus and process for treating wood and fibrous materials
US4194296A (en) * 1977-05-17 1980-03-25 Pagnozzi Ernesto Guglielmo Vacuum drying kiln
FR2422915A1 (fr) * 1978-04-13 1979-11-09 Pagnozzi Vincenzo Procede et installation utilisant un systeme de vapeur surchauffee pour le sechage du bois massif
US4233753A (en) * 1979-01-22 1980-11-18 Allwood, Inc. Method for preventing the splitting of logs during drying
US4467532A (en) * 1983-01-06 1984-08-28 Drake Harry W Apparatus and process for drying lumber
US4781778A (en) * 1983-11-16 1988-11-01 Stig Olofsson Method for manufacturing in wood cases used within the telecommunications industry
US4876802A (en) * 1983-12-21 1989-10-31 Gerhard Gergely Process and means for the heat treatment of powdery or granulate material
WO1986007547A1 (fr) * 1985-06-21 1986-12-31 Gerhard Gergely Procede et dispositif pour la manipulation de materiau de traitement et le produit de reaction fabrique a l'aide du procede et/ou du dispositif
FR2614682A1 (fr) * 1987-04-30 1988-11-04 Giuliani Lando Procede et dispositif de sechage d'un corps dans lequel une partie de l'humidite a extraire est retenue dans des cellules fermees
US5392530A (en) * 1991-03-04 1995-02-28 Izumi; Hyogo Method of seasoning lumber
US5578274A (en) * 1994-06-17 1996-11-26 Seidner; Marc A. Shipboard apparatus for heat-treating wood and wood products
KR20030042316A (ko) * 2001-11-22 2003-05-28 한전기공주식회사 급속 건조장치
US20080223360A1 (en) * 2005-10-04 2008-09-18 Basf Se Production of Modified Lignocellulosic Materials
US8291611B2 (en) 2010-06-30 2012-10-23 Eriksen Timothy L Multiple stage even-drying wood kiln system and method
US10627160B2 (en) * 2017-02-09 2020-04-21 Ulvac, Inc. Vacuum drying apparatus and vacuum drying method

Also Published As

Publication number Publication date
CA1025208A (en) 1978-01-31
JPS5044545A (Direct) 1975-04-22

Similar Documents

Publication Publication Date Title
US3921309A (en) Method of drying lumber
US4984587A (en) Rotary cylinder dryer and method of drying tobacco products
US4194296A (en) Vacuum drying kiln
US4343095A (en) Pressure dryer for steam seasoning lumber
US5687490A (en) Method of drying lumber
FI874354A7 (fi) Foerfarande foer torkning av trae och traebaserade produkter.
US2296546A (en) Method of artificially seasoning lumber
US1678559A (en) Drying materials
US3283412A (en) Process and apparatus for drying and treating lumber
US1778079A (en) Method of drying wet materials
US2513991A (en) Process for the esiccation of aqueous materials from the frozen state
WO2000067970A1 (en) Method and apparatus for drying material
GB1558913A (en) Drying of wet material
RU2162581C2 (ru) Способ сушки материала из древесины
RU2192590C2 (ru) Агрегат для сушки пиломатериалов
RU2105256C1 (ru) Вакуумно-конвективная лесосушильная камера
US3271873A (en) Method and apparatus for drying materials
RU2045720C1 (ru) Способ сушки древесины
SU620766A1 (ru) Способ сушки древесины
US3927478A (en) Method and apparatus for drying fibrous material
GB2268254A (en) Drying tobacco
SU982639A1 (ru) Способ зав ливани чайного листа
JPS63223481A (ja) 穀類の乾燥装置
US233473A (en) Process for drying fruit
JP2002031480A (ja) 密閉式乾燥方法及び乾燥装置