US3468036A - Method and apparatus for drying of materials - Google Patents

Method and apparatus for drying of materials Download PDF

Info

Publication number
US3468036A
US3468036A US696549A US3468036DA US3468036A US 3468036 A US3468036 A US 3468036A US 696549 A US696549 A US 696549A US 3468036D A US3468036D A US 3468036DA US 3468036 A US3468036 A US 3468036A
Authority
US
United States
Prior art keywords
air
moisture content
drying
relay
moisture
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
US696549A
Other languages
English (en)
Inventor
Josef Blaettler
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.)
INETA ESTABLISHMENT
Original Assignee
INETA ESTABLISHMENT
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 INETA ESTABLISHMENT filed Critical INETA ESTABLISHMENT
Application granted granted Critical
Publication of US3468036A publication Critical patent/US3468036A/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
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply

Definitions

  • ABSTRACT OF THE DISCLOSURE A method and apparatus for drying materials by means of circulating air condensation systems wherein the moisture content of the circulating air contacting the material to be dried is intermittently increased and subsequently decreased.
  • the actual value of moisture content in the circulating air is simultaneously compared with the reference value of moisture content throughout the intermittent increase and decrease thereof. If, during an intermittent increase of the moisture content of the circulating air, the actual value of moisture content fails to reach a predetermined reference value of moisture content Within a predetermined time interval, a signal is generated and delivered to a control apparatus which is effective to decrease or lower the reference value of the moisture content. The above operation is continued until the material is sufficiently dried.
  • the present invention relates to an improved method of drying materials by means of a so-called circulating air-condensation system. Furthermore, the present invention also pertains to an improved appartus for the performance of the aforementioned inventive method.
  • Another, more specific object of the present invention relates to an improved method and apparatus for the effective drying of materials in a highly etlicient, reliable and economical manner.
  • Another signicant object of the present invention relates to an improved method of, and apparatus for, the drying of materials in an extremely efficient, controlled and reliable manner, particularly for the drying of wood.
  • the inventive method is characterized by the features that the moisture content of the circulating air contacting the material to be dried is intermittently increased and subsequently decreased during the drying operation with simultaneous comparison of its reference value with its actual value, and during the reduction of the moisture content in previously determined time intervals a signal corresponding to the comparison is only then delivered to a control apparatus if after the expiration of a predetermined time the actual value of the air moisture content has not reached the reference value.
  • the quantity of cooling medium used in the cooling unit is regulated as a function of the moisture of the material to be dried.
  • the inventive apparatus for carrying out the aforementioned method is characterized by the features that a bridge circuit having a differential relay is provided for the intermittent increase and reduction of the air moisture content and a timing relay having a control mechanism is provided for the stepwise regulation of the moisture difference of the circulating air.
  • FIGURE 1 schematically illustrates in cross-sectional view a preferred embodiment of inventive drying installation
  • FIGURE 2 graphically illustrates a drying curve in order to explain the inventive method
  • FIGURE 3 is a lblock diagram of the electrical apparatus.
  • FIGURE 4 is a circuit diagram illustrating the differential relay as well as the time-relay provided with the reference value-control mechanism for the air moisture.
  • FIGURE 1 there is illustrated a housing H providing a chamber or compartment 7 which is partially mounted in the ground at the brick work 8. Located within the compartment or chamber 7 and at 4all sides thereof is a suitable insulating material 5. This drying chamber or compartment 7 is capable of receiving or housing the material 4 which is to be dried. This material ⁇ 4 is displaced into the drying chamber 7, for instance by means of suitable rails or the like which have conveniently only been schematically indicated by reference numerals 51. After completion of the drying operation this material 4 is again removed from such chamber 7.
  • the arrows 6 schematically represent the direction of ow or circulation of the air.
  • the circulating air is conveyed or transported in accordance with the direction of the arrows 6 by means of a suitable ventilator or blower 2, driven by means of a standard electric motor or other appropriate drive unit.
  • Reference numeral 1 designates a heating unit which serves to heat the circulating air to a constant pre-adjusted temperature.
  • reference numeral 3 designates a suitable cooling unit or device which cools the air below the dewpoint, and therefore, removes moisture from the air.
  • the water which condenses at the walls of the cooling unit 3 is removed by means of the discharge or outlet 9.
  • a vaporizer or evaporator 31 serves to moisten the chamber air.
  • the generated Vapor arrives at the air stream through the agency of a pipe or conduit 31a and the outlet portion or nozzle 3111. The purpose of this vaporizer or evaporator 31 for moistening the chamber air will be described in greater detail hereinafter.
  • FIGURE 1 there has only been illustrated one air circulating unit or system composed of the ventilator or blower 2, the heating device 1 and the cooling device or unit 3.
  • the ventilator or blower 2 the heating device 1 and the cooling device or unit 3.
  • larger chambers or cornpartments for instance with a chamber volume of 20 cubic meters and greater, it would be possible to use two or more such air circulation units.
  • Smaller drying installations for instance with a chamber volume up to five cubic meters are advantageously constructed as portable or transportable small installations which are formed as iron structures.
  • the curve A' for instance, is for hardwood and the curve B Ifor softwood. Furthermore, along the abscissa of this graph there is plotted the drying time, and along the ordinate the percent of relative atmospheric moisture. Such atmospheric moisture is measured by means of a suitable hygrometer which is applied to the location where the circulating air has absorbed the most moisture from the material to be dried.
  • the curve A for hardwood is represented by the connecting line for the peaks or tips of a so-called zig-zag curve. This zig-zag curve will now be explained and considered in detail.
  • the descending portion of the curve namely point C along the abscissa, for instance the section k1 signifies a reduction of the relative air moisture content from 90% to 80% of the circulating air which is flowing in the direction of the arrows 6.
  • This section k1 indicates that the cooling unit 3 is switched in and in this manner frees the circulating air of moisture until it reaches a moisture content of 80%. Thereafter, the cooling unit is switched out or the cooling work or efficiency is reduced by appropriately controlling the cooling medium, so that no moisture or only very little moisture is removed from the air, whereby the relative air moisture content again increases. This is indicated by section t1 at the curve A' in FIGURE 2.
  • FIGURE 2 This will be recognized in FIGURE 2 by the fact that the total drying curve A is sub-divided into DN sections. These sections have been labeled at the top of the curve by reference numerals I to V. Each of these sections represent a particular stage. In each stage there is adjusted a predetermined reference value of the air moisture content and such is compared with the actual air moisture content prevailing in the drying chamber 7. Now, as soon as the upper Value of the predetermined relative air moisture content which has been adjusted at each stage is no longer reached, for instance 90% is stage I, the next stage, for instance stage II, is automatically switched in and provides a new upper limit of the relative atmospheric moisture content for the entire control cycle.
  • FIGURE 2 there is depicted the above-described curve A', for instance for hardwood, and the further curve B for soft wood.
  • the curve B is constructed or plotted in the same manner as the curve A. Thus, it is not necessary to go into the further details of the curve B'.
  • the range or region B to C along the abscissa represents the heatingand vaporization period or time.
  • the vaporization time or period which likewise is plotted along the time axis at the interval or section B to C, is then provided if the stack of wood 4 is pre-dried wood, since by means of the so-called vaporization the dried pores ⁇ at the surface of the wood are again opened for the removal of the water from the interior of the wood cells.
  • the heating time as well as the vaporization time is solely dependent upon the type and quantity of the material to be dried as well as upon the degree of dryness of its surface.
  • FIGURE 3 there is depicted a block diagram of a preferred embodiment of inventive apparatus for carrying out the inventive method considered in connection with the explanation accompanying FIGURE 2.
  • a hygrometer 11 which is operatively coupled with two bridge circuits 12 and 13.
  • the bridge circuit or arrangement 12 acts upon a hygrometer 14.
  • This hygrometer 14 serves to indicate the relative air moisture content prevailing in the drying chamber lor compartment 7.
  • a further indicator is provided which can be set to a predetermined moisture value, for instance 40%.
  • the hygrometer ⁇ 14 switches the trip circuit or cutoff relay 16 through the agency of the amplifier 15. This cutoff relay or trip circuit 16 places the entire installation out of operation.
  • the hygrometer 11 which, as already described, is located at a suitable place within the chamber or compartment 7, is also simultaneously coupled with the bridge circuit or arrangement 13.
  • This bridge circuit 13 is composed of a bridge arm for the reference value adjustment of the air moisture content and a bridge arm for the actual-control of the actually prevailing air moisture content or humidity. This will be explained in greater detail in connection with FIGURE 4.
  • a differential relay 17 is arranged or operably associated with the bridge circuit 13. This differential relay 17 is energized when the bridge 13 is out of balance and controls the vaporizer 31 or the cooling unit 3 through the agency of an amplifier 18 and a relay 19.
  • Control of the cooling unit 3 is undertaken in such a manner, that in accordance with the predetermined values at the section C-D along the abscissa of the graph of FIGURE 2 in the periods k1-k4 (FIGURE 2) the cooling unit 3 is switched in and in the time periods t1-t3 the cooling unit 3 is switched out of its cooling work or capacity is reduced.
  • a time-relay 20 is connected with the relay 19 through the agency of a switching relay 30.
  • This switching relay 30 upon the expiration of predetermined time intervals, iniiuences the branch arm for the reference-value of the bridge circuit 13 but only then actuates the reference-value stages 21 when the amplifier 18 applies an appropriate potential to the connecting line or conductor to the time relay 20 by means of the relay 19.
  • the switching operation of the reference-value stages 21 will be recognized by referring to FIGURE 2 and is represented in the graph sections I to V.
  • the amplifier 18 is coupled with a time switch 22. This time switch 22 is responsible for placing into operation and terminating the heatingand vaporization time (see the abscissa section B-C of FIGURE 2).
  • the time switch 22 disconnects the voltage to the amplifier 18, so that the bridge circuit 13 can not influence the cooling unit 3 -by means of the relays 19 and 30. Only when the time switch 22 applies the voltage to the relay 30 does the actual drying operation begin as such has been indicated by the curves A and B in FIGURE 2.
  • the cut-off relay or trip circuit 16 which is arranged in the main line leading to the current supply network, represents the current supply for the amplifier 15, the amplifier 18, the time switch 22 and the amplifier 26.
  • the amplifier 26 is located in a control circuit which is influenced by a temperature feeler 23.
  • This temperature feeler 23 is likewise arranged in the drying chamber or compartment 7 and delivers its measurement value to the bridge circuit or arrangement 24.
  • the temperature indicating device 25 is provided with an indicator which is influenced by the bridge circuit 24 and thus indicates the temperature prevailing in the drying chamber or compartment 7 and furthermore such temperature indicating device 25 has a control indicator which can be adjusted to a predetermined temperature value.
  • FIGURE 4 there is depicted therein a circuit diagram of a portion of the block diagram of FIGURE 3.
  • the hygrometer 11 is electrically coupled with the bridge circuits 12 and 13 which have been schematically represented by the broken line or phantom lines boxes.
  • the hygrometer 11 is essentially composed of a potentiometer 111 with a variable tap 112.
  • the lower half of the potentiometer 111 provides the one arm of the bridge which is regulated in accordance with the measured air moisture content.
  • the other variable arm of the bridge is designated by the variable resistor 131.
  • This resistor 131 represents the maximum value which should be attained by the humidity of the air in the chamber or compartment 7.
  • Both of the other resistors which have been designated by reference numerals 132 are iixed bridge resistors.
  • a movingcoil device 17 which is constructed in known manner, and therefore, need not be considered in greater detail.
  • relay tube 181 which in known manner may be a gasfilled tube with auxiliary discharge and a starter electrode, anode and cathode, is not ignited in the illustrated position of the contact 171, and therefore does not energize the excitation coil 191 of the relay 19.
  • the switch contacts 192 and 194 are located in the illustrated position.
  • the contact 192 couples the starter electrode of the tube 181 with a negative potential, so that ignition of the tube 181 can not occur.
  • the cooling unit 3 canV only 7 then be actuated when, as already described in FIGURE 3, the time switch 22 has terminated the heatingand vaporizing period.
  • the arm of the bridge circuit 13 which is adjustable and responsible for the reference value can also assume different values as such is indicated by the variable resistor 131.
  • the variable resistor 131 For this purpose there are arranged a series of decade stages 21H to 21V which are electrically coupled via the switch contacts 221, 222, 223, 224 with the variable resistor 131, which provides the stage I.
  • a timing relay 20 is arranged between the control device 28 and the relay 19.
  • the contact 193 is thrown so that it is coupled with the left countercontact, that is to say when the cooling unit 3 is switched out, then voltage is applied to the timing relay 20 by means of the contact 201.
  • the actuated timing relay 20 after expiration of each regulated or adjusted time, closes its contact 202 so that the control device 28 is actuated.
  • the time relay 20 always only then only actuates the stepwise switching arrangement through the agency of the control device 28 when according to the curve A of FIGURE 2 at the time period t3 the upper range of the relative air humidity, for instance 86% at stage I of FIGURE 2, has not been reached.
  • the time t of the relay 20 can be seletcivelychanged during the entire drying operation in order to increase the moisture difference between the lower and the upper reference value.
  • the individual resistors a, b, c, d, e provided at the stages II to V are responsible for the adjustment of the reference value of the air humidity for each individual stage.
  • the selectors 226, 227, and so forth it is possible to select predetermined resistors. For instance, in stage II there has been selected the resistor e and in the stage III the resistor b, This selection is already undertaken prior to the beginning of the drying operation and by means of such selection it is possible to also regulate the ascent of the drying curve.
  • the selection of the reference value of the relative air moisture content or humidity in the individual stages can be delivered to the control device by means of a certain or predetermined program which has already been iixed prior to the drying operation and printed upon a punch card.
  • the dierential relay 17 Depending upon how the bridge 13 is adjusted in its values by the resistors 131 and a to e of the individual decade stages 21H to 21V, the dierential relay 17 accordingly switches its switch 171 to the one side, such as 172, or to the other side, such as 173.
  • the drying operation begins at point A along the abscissa of the graph of FIGURE 2.
  • the vaporizer 31 is switched in via the contact 194, relay 19 and via contact 301, and relay 30.
  • This vaporizer 31 generates water vapor which is conducted into the drying chamber or compartment 7 and by means of which it is possible to bring about a saturation of the air up to 90% relative moisture or humidity (section V1 of FIG- URE 2).
  • the vaporizer 31 it would be possible to employ a steam valve or some other equivalent structure.
  • the hygrorne-ter 11 assumes a resistance position whereby the bridge circuit or arrangement 13 is detuned in such a manner that the differential relay 17 switches to the counter contact 173.
  • the tripping relay 18 and the grid of the glow discharge tube 181 receives cathode potential, whereby such tube 181 ignites.
  • the anode current of the tube 181 ows through the coil of the relay 19 and the contacts 191 to 194 are thrown.
  • the vaporizer 31 is switched off.
  • the chamber air moisture or humidity drops. Due to the change of the air the resistance of the hygrometer 11 also changes together with the voltage of the bridge circuit 13 and the position of the differential relay 17. If the air humidity has dropped to then the bridge is detuned in such a manner that the differential relay 17 closes the contact 172, the tube 181 extinguishes and the relay 19 is de-energized. Now, the vaporizer 31 is again switched in by means of the Contact 194 (section V2 of FIGURE 2). This intermittent moistening of the chamber air occurs during the running of the timing relay 22 (section B-C of FIGURE 2).
  • the relay 30 is impressed with voltage, whereby the contacts 301 to 304 are thrown.
  • the vaporizer 31 is continuously switched ott and the cooling unit or condensator 3 is switched in via the contact 302, together with the time-delayed relay 20 Via the contact 303. If the air humidity has reached a relative Imoisture content of 90% owing to vaporization of moisture by the material to be dried, then the bridge is detuned in such a manner that the contact 172 closes.
  • the bridge current now ows in the opposite direction through the coil of the differential relay 17.
  • the glow discharge tube 181 extinguishes, relay 19 is de-energized and the cooling unit 3 is switched in via the contacts 194, 302 (section k1 of FIGURE 2).
  • the timing relay 20 is switched off and the cooling unit 3vis switched in via the contacts 194, 302 (section k2 of FIGURE 2).
  • This intermittent condensation repeats for such length of time (section CD1 of stage I of FIGURE 2) until the timing relay 20 has run out or expirerd without the maximum reference value of 90% relative air humidity having been reached.
  • the time relay 20 closes the contact 202, applies voltage to the stage switch 28 and switches to stage II (section D1-D2 of FIGURE 2).
  • the cycle which was described in stage I repeats in the same manner, however between the maximum reference value of relative air humidity and the value of 75 relative air humidity.
  • control device switches the stage III (section Dz-Ds of FIGURE 2), and so fourth, until the air moisture content of humid- 9 ity which has been previously adjusted at the hygrometer 14 of FIGURE 3 has been obtained and via the amplifier 15 switches-off the cut off relay 16 and interrupts the control current circuit.
  • switching off of the control current via the cut off relay or tripping circuit 16 can also take place by means of a counting mechanism 40 depicted in FIGURE 3.
  • This counting mechanism 4'0 records the amount of separated condensate in liters during the drying period. After the previously regulated number of liters has been condensed, then a signal is delivered to the amplifier 15 of FIGURE 3 which interrupts the control voltage from the cut off relay 16 ,and switches oftr the control current circuit.
  • FIGURE 4 there has been employed by way of illustration and explanation, relays and mechanical switch contacts, it is to be expressly understood that such is not to be construed in a limiting fashion with respect to the underlying concepts of the present invention. Quite to the contrary, it would be readily possible to use electronic components which can fulfill the same purpose. Moreover, it will be apparent that various modifications and changes can be undertaken by those skilled in the art without departing from the teachings and principles of the subject invention.
  • a method of drying materials by means of circulating air condensation systems comprising the steps of:
  • both the comparison magnitude between the reference value of moisture content and the actual value of moisture content during each intermittent increase and subsequent decrease of moisture content as well as the duration of said intermittent increase and subsequent decrease in moisture content are regulated to one another in such a way that the relationship between the air moisture content of the circulating air and said duration results in a drying characteristic which is inherent for the relevant material to be dried.
  • a method of drying materials as defined in claim S further including the step of progressively reducing the quantity of cooling .medium utilized to cool the circulating air.
  • said means for intermittently increasing and decreasing through a predetermined moisture difference the moisture content of the circulating air contacting the material to be dried, said means including bridge circuit means and differential relay means;
  • time delay relay means operatively coupled with said differential relay means, said time delay relay means responding during an intermittent increase of the moisture content in the circulating air only if the moisture content fails to reach a predetermined reference value during a predetermined time interval;
  • control device means responsive to said time delay relay means for the stepwise adjustment of said moisture difference of said circulating air.
  • said bridge circuit .means includes a measuring :bridge arrangement having an indicating device for indicating the actual moisture content of the circulating air and including a terminal switch operative when said actual moisture content reaches a terminal value, said bridge circuit means further including a control bridge arrangement for comparing the actual value of moisture content in the air with a reference value; wherein said differential relay means is operatively coupled with said control bridge arrangement for continually evaluating the compared reference and actual values of the moisture content of the circulating air.
  • control device means includes stage switch means operatively coupled with said time delay relay means for controlling the reference value of the air moisture content.
  • control device means includes decade stage switch means for adjusting the moisture difference of the actual value of the moisture content during the intermittent increase and decrease of the moisture content.
  • said means for intermittently increasing and decreasing the moisture content of the circulating air includes cooling means for cooling and condensing the moisture from the circulating air, and switch means operatively coupled between said differential relay means and said time delay relay means for selectively switching in said cooling means and said time delay relay means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US696549A 1967-01-13 1968-01-09 Method and apparatus for drying of materials Expired - Lifetime US3468036A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH48067A CH469237A (de) 1967-01-13 1967-01-13 Verfahren und Einrichtung zum Trocknen von Gütern

Publications (1)

Publication Number Publication Date
US3468036A true US3468036A (en) 1969-09-23

Family

ID=4187962

Family Applications (1)

Application Number Title Priority Date Filing Date
US696549A Expired - Lifetime US3468036A (en) 1967-01-13 1968-01-09 Method and apparatus for drying of materials

Country Status (9)

Country Link
US (1) US3468036A (de)
AT (1) AT284733B (de)
CH (1) CH469237A (de)
DE (1) DE1729411C3 (de)
FI (1) FI48136C (de)
FR (1) FR1550816A (de)
GB (1) GB1175301A (de)
NO (1) NO125205B (de)
SE (1) SE348824B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744144A (en) * 1971-04-23 1973-07-10 H Weis Automated controls for lumber drying kiln
US3972128A (en) * 1973-01-08 1976-08-03 Viktor Vanicek Process for drying hygroscopic materials
US4519145A (en) * 1984-03-12 1985-05-28 Magic Chef, Inc. Electrostatic and moisture control system for automatic clothes dryers
US4850118A (en) * 1988-05-13 1989-07-25 Calcomp Inc Humidity control for roll paper electrostatic plotters
US4989995A (en) * 1988-09-07 1991-02-05 Fabritec International Corporation Anti-static garment bag for reducing static buildup in the drycleaning process
US5082466A (en) * 1988-09-07 1992-01-21 Fabritec International Corporation Anti-static garment bag for reducing static buildup in the drycleaning process
WO1995022035A1 (en) * 1994-02-11 1995-08-17 ABB Fläkt AB Method and arrangement for drying wood
WO1997008504A1 (en) * 1995-08-14 1997-03-06 Utec Sm Ab Method for drying wood
US20050050753A1 (en) * 2001-11-30 2005-03-10 Heinz Resch Drier for continuous flow drying of food products
DE102011055105A1 (de) 2011-11-07 2013-05-08 Reinhard Krüger Verfahren zur Herstellung von getrocknetem Holz sowie getrocknetes Holz
WO2015072919A1 (en) * 2013-11-18 2015-05-21 Coldbay Ab A method and system for drying wood in a drying compartment
US11235737B2 (en) 2018-06-25 2022-02-01 Eisenmann Se Temperature control apparatus for controlling the temperature of objects
BE1029615B1 (nl) * 2021-07-22 2023-02-20 Cras Nv Werkwijze voor het drogen van een stapel hout

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896558A (en) * 1972-11-08 1975-07-29 Lovgrens Byggnads Ab Alfred Method of controlling drying of timber in a closed room
SE423931B (sv) * 1980-10-15 1982-06-14 Nils Oskar Tore Loof Sett att torka treprodukter
JPS57501882A (de) * 1980-11-14 1982-10-21
AT384887B (de) * 1981-11-03 1988-01-25 Leisser Josef Trockeneinrichtung fuer holz
DE3400300C2 (de) * 1983-06-24 1986-01-23 Gebrüder Bühler AG, Uzwil Verfahren zur Herstellung von langen Teigwaren und Vorrichtung zur Durchführung eines solchen Verfahrens
SE8401221D0 (sv) * 1984-03-06 1984-03-06 Sten Zeilon Slutet, intermittent torkningsforfarande
FR2681673A1 (fr) * 1991-09-19 1993-03-26 Semada Ingenierie Procede et installation de sechage de materiaux granulaires.
DE102022106284A1 (de) 2022-03-17 2023-09-21 Dürr Systems Ag Behandlungsanlage und Verfahren zum Behandeln von Werkstücken

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920398A (en) * 1955-01-15 1960-01-12 Svenska Flaektfabriken Ab Channel driers
US3148955A (en) * 1960-11-21 1964-09-15 Nichols Ervy Dry kiln humidifier
US3337967A (en) * 1961-05-08 1967-08-29 Fan Air Systems Inc Low temperature, high humidity lumber drying kiln

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920398A (en) * 1955-01-15 1960-01-12 Svenska Flaektfabriken Ab Channel driers
US3148955A (en) * 1960-11-21 1964-09-15 Nichols Ervy Dry kiln humidifier
US3337967A (en) * 1961-05-08 1967-08-29 Fan Air Systems Inc Low temperature, high humidity lumber drying kiln

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744144A (en) * 1971-04-23 1973-07-10 H Weis Automated controls for lumber drying kiln
US3972128A (en) * 1973-01-08 1976-08-03 Viktor Vanicek Process for drying hygroscopic materials
US4519145A (en) * 1984-03-12 1985-05-28 Magic Chef, Inc. Electrostatic and moisture control system for automatic clothes dryers
US4850118A (en) * 1988-05-13 1989-07-25 Calcomp Inc Humidity control for roll paper electrostatic plotters
US4989995A (en) * 1988-09-07 1991-02-05 Fabritec International Corporation Anti-static garment bag for reducing static buildup in the drycleaning process
US5082466A (en) * 1988-09-07 1992-01-21 Fabritec International Corporation Anti-static garment bag for reducing static buildup in the drycleaning process
WO1995022035A1 (en) * 1994-02-11 1995-08-17 ABB Fläkt AB Method and arrangement for drying wood
WO1997008504A1 (en) * 1995-08-14 1997-03-06 Utec Sm Ab Method for drying wood
US20050050753A1 (en) * 2001-11-30 2005-03-10 Heinz Resch Drier for continuous flow drying of food products
US6895687B2 (en) * 2001-11-30 2005-05-24 Buhler Ag Drier for continuous flow drying of food products
DE102011055105A1 (de) 2011-11-07 2013-05-08 Reinhard Krüger Verfahren zur Herstellung von getrocknetem Holz sowie getrocknetes Holz
WO2015072919A1 (en) * 2013-11-18 2015-05-21 Coldbay Ab A method and system for drying wood in a drying compartment
US11235737B2 (en) 2018-06-25 2022-02-01 Eisenmann Se Temperature control apparatus for controlling the temperature of objects
BE1029615B1 (nl) * 2021-07-22 2023-02-20 Cras Nv Werkwijze voor het drogen van een stapel hout

Also Published As

Publication number Publication date
GB1175301A (en) 1969-12-23
DE1729411B2 (de) 1973-08-23
CH469237A (de) 1969-02-28
AT284733B (de) 1970-09-25
FI48136B (de) 1974-02-28
DE1729411C3 (de) 1974-03-28
SE348824B (de) 1972-09-11
FI48136C (fi) 1974-06-10
FR1550816A (de) 1968-12-20
DE1729411A1 (de) 1972-08-31
NO125205B (de) 1972-07-31

Similar Documents

Publication Publication Date Title
US3468036A (en) Method and apparatus for drying of materials
US3131034A (en) Process for drying lumber
US3940860A (en) Method and apparatus for drying a hygroscopic material possessing fibrous structure
US2920398A (en) Channel driers
US3337967A (en) Low temperature, high humidity lumber drying kiln
US3636638A (en) Automatic grain dryer
US2403630A (en) Apparatus for drying fabrics
US1525131A (en) Process of drying articles
GB1000055A (en) Improvements in or relating to drying apparatus
US2763069A (en) Method of controlling air seasoning of wood
US3155471A (en) Dry air system for isolated phase bus
US1422839A (en) Method of humidifying air
US1416218A (en) Apparatus for dehumidifying air
DE929612C (de) Offsetdruckverfahren und Vorrichtung
US3399680A (en) Apparatus for the treatment of vegetable matter, in particular tobacco
US3434223A (en) Apparatus for changing the moisture content of a material by the action of air
US1422620A (en) Dehydrator or drier
JPH0627631B2 (ja) 乾燥空気制御方法
JP2877537B2 (ja) 鋼帯の乾燥方法
SU115691A1 (ru) Экспериментальна экологическа камера с автоматическим регулированием параметров
JPH076642B2 (ja) 除湿機の使用方法
US1371083A (en) Apparatus for drying materials, especially leather, by means of gases
JP3194453B2 (ja) 陶芸用乾燥装置
US1228283A (en) Apparatus and process for drying.
US2984913A (en) Automatic control for air conditioning means