EP0937810B1 - Process for drying laundry, or the like, in washer-driers, or the like - Google Patents
Process for drying laundry, or the like, in washer-driers, or the like Download PDFInfo
- Publication number
- EP0937810B1 EP0937810B1 EP98830096A EP98830096A EP0937810B1 EP 0937810 B1 EP0937810 B1 EP 0937810B1 EP 98830096 A EP98830096 A EP 98830096A EP 98830096 A EP98830096 A EP 98830096A EP 0937810 B1 EP0937810 B1 EP 0937810B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laundry
- movement
- rotation
- drying
- drum
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
- D06F33/52—Control of the operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/06—Type or material
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/28—Air properties
- D06F2103/34—Humidity
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/68—Operation mode; Program phase
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
- D06F2105/48—Drum speed
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
Definitions
- the invention relates to a process for drying laundry, or the like, in washer-driers and driers, or the like, according to the preamble of claim 1.
- the dimensions of the drum cannot be increased at will and must be kept within certain limits if the machines are not to become too large, which would be a serious inconvenience, especially for machines intended for domestic use.
- Document EP-A-761 discloses a process according to the preamble of claim 1.
- the drum is driven at a rotational speed which is higher than the speed normally used.
- the drying cicle comprises several phases during each of which phase the rotational speed of the drum is different relatively to the rotational speed of the following phase.
- the rotational speeds of the different phases may be higher, similar or lower than the drying rotational speed.
- Document CH-A-659841 discloses also a method for drying laundry.
- the method taught therein aims to reduce the mechanical stress on the laundry during drying and provides a variation of the revolution of the drum during the drying process. This variation consist in a reduction of the rotational speed from a first higher speed to a secondo lower speed.
- the rotational speed may be reduced step by step.
- the object of the invention is to provide a drying process that can be used in present-day driers and in particular in present-day washer-driers, that will increase the efficiency of the drying phase and therefore making it shorter, without requiring structural modifications to the actual machines.
- the invention achieves the above objects by means of a process for drying laundry, or the like, in washer-driers or driers, or the like, of the type according to the preamble of claim 1 and which further comprises the combination of steps according to the characterising part of claim 1.
- the speed of movement of the laundry is selected such that when the movement stops for the pause, the laundry is tumbled, whereas during the movement the inertial forces do not cause excessive compression and compacting of the said laundry.
- the speed of movement of the laundry during the drying phase is faster than its speed during washing by approximately a factor of up to 3.
- the speeds of movement of the laundry may be variable to suit the types of fabric being handled.
- the invention relates in particular and by way of example to an embodiment of the drying process used in conjunction with driers and/or washer-driers having a cylindrical drum with a horizontal axis of rotation, such as are conventionally used at present, but may be extended with no particular ingenuity to machines in which the drum rotates on a vertical axis and to any other type of washing machine and/or drier with laundry agitating cycles.
- the alternating rotation referring to the two opposite directions of rotation, can be achieved by any method.
- one possibility is an oscillating motion of the drum in both directions of rotation without the drum ever actually completing a full revolution in either direction.
- the drum may be rotated one or more times without interruption in one direction and one or more times in the opposite direction directly following on.
- drum movement programs described above in each phase of movement and the said drum movement programs can also vary from one phase of movement to the next in the course of the drying phase.
- the speeds of rotation In combination with the alternating rotation, that is referring to the directions of rotation of the drum, it is advantageous for the speeds of rotation to be between approximately 80 and 200, preferably between approximately 100 and 150 revolutions per minute of the said drum.
- the preset speed of rotation is sufficiently high to press the laundry gently against the sides of the drum without compressing it into too compact a mass and without causing it to continue to cling to the sides of the drum even when the drum has stopped.
- the laundry at the top of the drum can therefore tumble down. This ensures that all the items or all parts of the items of the laundry come into contact with the stream of hot air.
- the drying phase in accordance with the invention is repeated throughout the duration of the drying process. In this way all the laundry contained in the drum is subjected to the action of the hot drying air, in a uniform manner, both as regards laundry situated close to the hot air inlet and that close to the hot air outlet, as well as that on the bottom of the drum.
- the process according to the invention is very simple and, as is clear, requires no structural modifications to machines currently in use. Moreover the process achieves greater drying efficiency with total drying times 20 to 40% shorter than can be achieved by currently known methods.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
- Drying Of Solid Materials (AREA)
- Compounds Of Unknown Constitution (AREA)
- Detergent Compositions (AREA)
Abstract
Description
- The invention relates to a process for drying laundry, or the like, in washer-driers and driers, or the like, according to the preamble of claim 1.
- In known driers, and particularly in known washer-driers, the rotating drums are not very large and the laundry occupies almost the entire available space. In addition, the type of drum movement currently employed, in which the drum has phases of rotation at a predetermined speed and in one direction only, alternating with pauses, does not agitate and lift the laundry sufficiently to ensure the formation of considerable spaces through which the hot drying air can pass. The difficulty the hot air has in traversing the laundry reduces the efficiency of the drying process, which is consequently made slower. Known processes therefore involve relatively long drying times.
- Moreover, the dimensions of the drum cannot be increased at will and must be kept within certain limits if the machines are not to become too large, which would be a serious inconvenience, especially for machines intended for domestic use.
- Document EP-A-761 discloses a process according to the preamble of claim 1. During the drying cicle, the drum is driven at a rotational speed which is higher than the speed normally used. The drying cicle comprises several phases during each of which phase the rotational speed of the drum is different relatively to the rotational speed of the following phase. Advantageosly the rotational speeds of the different phases may be higher, similar or lower than the drying rotational speed.
- Document CH-A-659841 discloses also a method for drying laundry. The method taught therein aims to reduce the mechanical stress on the laundry during drying and provides a variation of the revolution of the drum during the drying process. This variation consist in a reduction of the rotational speed from a first higher speed to a secondo lower speed. The rotational speed may be reduced step by step.
- The object of the invention is to provide a drying process that can be used in present-day driers and in particular in present-day washer-driers, that will increase the efficiency of the drying phase and therefore making it shorter, without requiring structural modifications to the actual machines.
- The invention achieves the above objects by means of a process for drying laundry, or the like, in washer-driers or driers, or the like, of the type according to the preamble of claim 1 and which further comprises the combination of steps according to the characterising part of claim 1.
- The speed of movement of the laundry is selected such that when the movement stops for the pause, the laundry is tumbled, whereas during the movement the inertial forces do not cause excessive compression and compacting of the said laundry.
- The speed of movement of the laundry during the drying phase is faster than its speed during washing by approximately a factor of up to 3.
- The speeds of movement of the laundry may be variable to suit the types of fabric being handled.
- In addition to varying the speed of the motion of agitation/movement of the laundry, it is also possible for the program of alternating movement between the successive phases of movement of the drying process to be varied in accordance with any program.
- During the spinning phase, normally only some 50% of the water is removed. This means that faster speeds of movement can be used during the subsequent drying phase without running the risk that the inertial effect produced by the motion on the mass of water still held within the laundry will cause it to be too heavily compressed and hence compacted. As the drying process proceeds, the mass of water held within the laundry gradually decreases so that the speed of movement is increased without the danger of excessive compression and hence of excessive compacting of the laundry.
- The invention relates in particular and by way of example to an embodiment of the drying process used in conjunction with driers and/or washer-driers having a cylindrical drum with a horizontal axis of rotation, such as are conventionally used at present, but may be extended with no particular ingenuity to machines in which the drum rotates on a vertical axis and to any other type of washing machine and/or drier with laundry agitating cycles.
- In particular, when using drums rotating on a horizontal axis of rotation, the movement of the laundry is achieved by an alternating rotation of the drum in both clockwise and anticlockwise directions.
- The alternating rotation, referring to the two opposite directions of rotation, can be achieved by any method. For example, one possibility is an oscillating motion of the drum in both directions of rotation without the drum ever actually completing a full revolution in either direction.
- Alternatively, the drum may be rotated one or more times without interruption in one direction and one or more times in the opposite direction directly following on.
- As an alternative, it is also possible to perform several rotations in one direction and several rotations in the opposite direction for each phase of movement of the laundry, each rotation or several rotations in one direction being followed by one or more rotations in the opposite direction.
- It is also possible to have combinations of the drum movement programs described above in each phase of movement and the said drum movement programs can also vary from one phase of movement to the next in the course of the drying phase.
- In combination with the alternating rotation, that is referring to the directions of rotation of the drum, it is advantageous for the speeds of rotation to be between approximately 80 and 200, preferably between approximately 100 and 150 revolutions per minute of the said drum.
- By means of these arrangements, during the phase of alternating rotation of the drum the laundry is held against the sides of the drum, leaving a free region in the centre which allows the hot drying air to pass through along the full length of the drum.
- The preset speed of rotation is sufficiently high to press the laundry gently against the sides of the drum without compressing it into too compact a mass and without causing it to continue to cling to the sides of the drum even when the drum has stopped.
- During the pause, i.e. when the drum stops, the laundry at the top of the drum can therefore tumble down. This ensures that all the items or all parts of the items of the laundry come into contact with the stream of hot air.
- The drying phase in accordance with the invention is repeated throughout the duration of the drying process. In this way all the laundry contained in the drum is subjected to the action of the hot drying air, in a uniform manner, both as regards laundry situated close to the hot air inlet and that close to the hot air outlet, as well as that on the bottom of the drum.
- The process according to the invention is very simple and, as is clear, requires no structural modifications to machines currently in use. Moreover the process achieves greater drying efficiency with total drying times 20 to 40% shorter than can be achieved by currently known methods.
- Needless to say, the reduction in drying times also means that less energy is used.
- The process according to the invention is not limited to the embodiments described above but can be greatly varied without thereby departing from the underlying principle set forth above and claimed below.
Claims (9)
- Process for drying laundry, or the like, in washer-driers and driers, or the like, in which the laundry, which has first undergone removal of a certain amount of water, by spinning, is subjected to the action of a stream of hot air while at the same time being agitated/moved to produce a lifting/tumbling of the laundry and greater exposure to the stream of hot air, the said process comprises further at least two, or more, phases of movement of the laundry, or the like, alternating with pauses, in which, during the phases of movement, the laundry is subjected to a motion of movement/agitation which concentrates the said laundry in order to leave a considerable free volume for the passage of the hot drying air through the laundry containment vessel, preferably forming a channel for the passage of the drying air through the laundry which is distributed uniformly around this channel, and in which the drying laundry is subjected to an alternating motion in.two different directions, preferably opposite directions, each phase of movement being carried out at a predetermined different speed of movement of the laundry, characterised in that the said predetermined different speed of each phase of movement increases as the drying process proceeds.
- Process according to Claim 1, characterized in that during the phases of movement, the speed of movement of the laundry is selected such that the inertial forces acting on the laundry do not cause excessive compression and compacting of the said laundry, and during the pause when the movement stops the laundry is tumbled.
- Process according to Claim 1 or 2, characterized in that during washing the drum is rotated at a predetermined speed while the speed of movement of the laundry during the movement phases of the drying process is faster than the speed during washing by approximately a factor of up to 3.
- Process according to one or more of the preceding claims, characterized in that the speeds of movement of the laundry may be variable to suit the types of fabric being handled.
- Process according to one or more of the preceding claims, in which drying is performed in driers or washer-driers having a cylindrical drum with a horizontal and/or vertical axis of rotation.
- Process according to Claim 5, characterized in that the alternating movement of the laundry is achieved by an alternating rotation of the drum in both clockwise and anticlockwise directions of rotation.
- Process according to Claim 6, characterized in that the alternating rotation, referring to the two opposite directions of rotation, is in the form of an oscillating motion of the drum in both directions of rotation with angular amplitudes smaller than a complete revolution in each of the two directions.
- Process according to one or more of the preceding claims, characterized in that during each phase of movement the drum performs one or more rotations in each of the two directions of rotation, which rotations are carried out in each direction without interruption, or else each rotation or at least two rotations in one direction alternate with one or at least two rotations in the opposite direction.
- Process according to one or more of Claim 5 to 8 , characterized in that the speed of rotation of the drum during the phases of movement of the laundry is between approximately 80 and approximately 200, preferably between approximately 100 and approximately 150 revolutions per minute.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT98830096T ATE241719T1 (en) | 1998-02-24 | 1998-02-24 | METHOD FOR DRYING LAUNDRY OR THE LIKE IN A WASHER-DRYER OR THE LIKE |
DK98830096T DK0937810T3 (en) | 1998-02-24 | 1998-02-24 | Process for drying laundry or the like in washing / drying machines or the like |
DE69815056T DE69815056T2 (en) | 1998-02-24 | 1998-02-24 | Method for drying laundry or the like in a washer dryer or the like |
PT98830096T PT937810E (en) | 1998-02-24 | 1998-02-24 | DRYING PROCESS, OR EQUIVALENT, IN "WASHING MACHINES - DRYERS", OR EQUIVALENTS |
EP98830096A EP0937810B1 (en) | 1998-02-24 | 1998-02-24 | Process for drying laundry, or the like, in washer-driers, or the like |
ES98830096T ES2200301T3 (en) | 1998-02-24 | 1998-02-24 | PROCEDURE FOR DRYING OF COLADA, OR SIMILAR, IN WASHERS-DRYERS, OR SIMILAR. |
HK00100930A HK1022001A1 (en) | 1998-02-24 | 2000-02-17 | Process for drying laundry, or the like, in washer-driers, or the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98830096A EP0937810B1 (en) | 1998-02-24 | 1998-02-24 | Process for drying laundry, or the like, in washer-driers, or the like |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0937810A1 EP0937810A1 (en) | 1999-08-25 |
EP0937810B1 true EP0937810B1 (en) | 2003-05-28 |
Family
ID=8236552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98830096A Expired - Lifetime EP0937810B1 (en) | 1998-02-24 | 1998-02-24 | Process for drying laundry, or the like, in washer-driers, or the like |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0937810B1 (en) |
AT (1) | ATE241719T1 (en) |
DE (1) | DE69815056T2 (en) |
DK (1) | DK0937810T3 (en) |
ES (1) | ES2200301T3 (en) |
HK (1) | HK1022001A1 (en) |
PT (1) | PT937810E (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1577433B2 (en) † | 2004-02-17 | 2015-11-25 | LG Electronics, Inc. | Operation control method for a drum type washing machine |
FR2907806B1 (en) * | 2006-10-25 | 2008-12-05 | Brandt Ind Sas | METHOD FOR DRYING THE LAUNDRY OF A DRYING MACHINE |
EP2458076B1 (en) | 2010-11-29 | 2014-01-08 | Electrolux Home Products Corporation N.V. | Rotatable-drum laundry drier and method of controlling a rotatable-drum laundry drier to dry delicate laundry |
DE102016113723A1 (en) | 2016-07-26 | 2018-02-01 | Miele & Cie. Kg | A method for treating laundry, method and apparatus for operating a laundry treating machine and laundry treating machine for treating laundry |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH659841A5 (en) * | 1982-07-26 | 1987-02-27 | V Zug Ag | Process for the drying of ready-made clothing laundry in a drum-type dryer |
FR2738262B1 (en) * | 1995-09-01 | 1997-09-26 | Esswein Sa | IMPROVED DRYING PROCESS FOR LAUNDRY AND MACHINE USING THE SAME |
-
1998
- 1998-02-24 ES ES98830096T patent/ES2200301T3/en not_active Expired - Lifetime
- 1998-02-24 EP EP98830096A patent/EP0937810B1/en not_active Expired - Lifetime
- 1998-02-24 AT AT98830096T patent/ATE241719T1/en not_active IP Right Cessation
- 1998-02-24 PT PT98830096T patent/PT937810E/en unknown
- 1998-02-24 DE DE69815056T patent/DE69815056T2/en not_active Expired - Fee Related
- 1998-02-24 DK DK98830096T patent/DK0937810T3/en active
-
2000
- 2000-02-17 HK HK00100930A patent/HK1022001A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE241719T1 (en) | 2003-06-15 |
DE69815056D1 (en) | 2003-07-03 |
EP0937810A1 (en) | 1999-08-25 |
ES2200301T3 (en) | 2004-03-01 |
DK0937810T3 (en) | 2003-10-27 |
HK1022001A1 (en) | 2000-07-21 |
DE69815056T2 (en) | 2004-03-18 |
PT937810E (en) | 2003-10-31 |
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