EP3450610B1 - A method of operation for washing using ultraviolet light - Google Patents

A method of operation for washing using ultraviolet light Download PDF

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Publication number
EP3450610B1
EP3450610B1 EP17204114.7A EP17204114A EP3450610B1 EP 3450610 B1 EP3450610 B1 EP 3450610B1 EP 17204114 A EP17204114 A EP 17204114A EP 3450610 B1 EP3450610 B1 EP 3450610B1
Authority
EP
European Patent Office
Prior art keywords
drum
period
ultraviolet light
time
washing
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.)
Active
Application number
EP17204114.7A
Other languages
German (de)
French (fr)
Other versions
EP3450610A1 (en
Inventor
Caner ULGUEL
Nizami Barkin Elmas
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.)
Vestel Beyaz Esya Sanayi ve Ticaret AS
Original Assignee
Vestel Beyaz Esya Sanayi ve Ticaret AS
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Publication of EP3450610A1 publication Critical patent/EP3450610A1/en
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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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/006—Methods for washing, rinsing or spin-drying for washing or rinsing only

Definitions

  • the present invention is related to a method of operating a washing machine that carry out a disinfection process with ultraviolet light (UV).
  • UV ultraviolet light
  • washing devices such as washing machines, which are generally used for washing textile products
  • the process of washing is carried out using washing liquids containing washing agents such as detergent.
  • washing agents such as detergent
  • it is aimed to dissolve foreign substances on the item to be washed on one hand and to destroy living things such as microbes and bacteria on the other hand.
  • said washing agents are generally successful in dissolving the foreign substances, they are not successful enough to destroy living things such as microbes and bacteria. Therefore, washing processes in the traditional applications cannot ensure disinfection of the washed items.
  • UV ultraviolet light
  • UV light is transmitted by an ultraviolet light source onto the items to be washed.
  • the ultraviolet light sent onto the items enables to destroy the living things such as microbes and bacteria that are present on the items.
  • UV light is not be able to be sent to all surfaces of the washed item, disinfection cannot be achieved at the desired level.
  • a washing machine comprising a cabinet, a door, a tub installed in the cabinet, a drum rotatably installed inside the tub, an ultraviolet light source for radiating ultraviolet rays into the drum and a washing method in the same.
  • the washing method comprises a sterilization step, in which step, the ultraviolet lamp is activated to radiate the ultraviolet rays after a dehydration step and during the ultraviolet radiation, the motor reverses the drum alternately clockwise and counter clockwise, for evenly shaking up the laundry; and rotates at a speed having centrifugal force below 1 G, for widely transmitting sterilization effects of the ultraviolet rays.
  • this shaking process is unable to unfold the washed items and provide the UV light to reach to the items sufficiently.
  • a drum-type washing machine comprising an ultraviolet irradiation device and a water level sensor to detect the water level stored in a water tank is disclosed.
  • water level is observed by the water level sensor, and the ultraviolet light is activated, when the water level reaches a predetermined level, which is higher than the installation height of the ultraviolet irradiation device. Since the water level is set higher than that of the ultraviolet irradiation device, the distance between the ultraviolet irradiation position and the washing item in the washing water becomes close, and the ultraviolet ray easily reaches the laundry.
  • KR20080043721A discloses a washing machine and a related method; wherein, in order to sterilize the laundry, optically stimulated anti-bacteria agent added water is used and ultraviolet light is radiated to the laundry during washing process.
  • JP2000157781A discloses a washing machine comprising a water tank, a drum rotatably provided in the water tank, a motor for driving the drum and a lamp for lighting the drum.
  • the lamp is an ultraviolet lamp and can be used for a tank cleaning process; in which process, the lamp is turned on and the drum is continuously driven to rotate with repetition of normal rotation and reverse rotation at a low speed for a predetermined time; then a predetermined amount of water is supplied into the water tank and then, the drum is again driven to rotate.
  • WO2014/104796A1 discloses a washing machine using a UV LED, which can sterilize and deodorize the interior, is disclosed. During washing, rinsing, dewatering and drying processes the UV lamp can be used for sterilization. However, these documents cannot provide a solution for folded laundries.
  • an anti-wrinkle cleaning method for a drum type washing machine is disclosed.
  • the bacteria are sterilized by regular ultraviolet irradiation to the washing tub.
  • the method includes the following steps: after the wrinkle treatment is started, the first cloth loosening stage is performed; after the first cloth loosening stage is completed, the first ultraviolet irradiation stage is performed; the first cloth loosening stage and the first ultraviolet irradiation stage are repeated, and the cloth loosening stage and the ultraviolet irradiation stage are cycled until the wrinkle treatment is over.
  • this method there is not sufficient time for applying ultraviolet light after the laundries are unfolded.
  • the items in the washing device are separated from the drum, and subsequently the said items are unfolded (overlapping folded / stuck surfaces are smoothed).
  • overlapping folded / stuck surfaces are smoothed.
  • the object of the present invention is to provide a method of operation for enhancing disinfection in washing devices that carry out disinfection with ultraviolet light.
  • Another object of the present invention is to provide a method of operation that allows for sending ultraviolet light to different surfaces of the washed items.
  • Yet another object of the present invention is to provide a method of operation, which is fast, reliable and efficient.
  • washing devices such as washing machines
  • an item e.g. a textile product
  • washing liquid containing a washing agent such as detergent
  • washing agents cannot adequately provide a disinfection process, especially because of the fact that the washing agents are not sufficient to destroy living organisms.
  • Ultraviolet light can be used in washing devices to provide disinfection. For this reason, with the present invention, there is developed a method of operation for enhancing disinfection in washing machines that carry out disinfection process with ultraviolet light.
  • the method of operation developed according to the present invention is defined in the independent claim.
  • the method is adapted for use in washing machines that comprise at least one tub in which the washing process is carried out; at least one drum located inside the tub, which rotates in the tub, and into which the items to be washed are loaded; at least one door for allowing access to the drum; and at least one ultraviolet light source, which is preferably located on the door for transmitting ultraviolet light into the drum.
  • Said method of operation comprises the steps of transmitting ultraviolet light into the drum by activating the ultraviolet light source; rotating the drum for a first period of time at a first rotational speed; stopping the drum for a second period of time following the first period of time; repeating the steps of rotating the drum for a first period of time and stopping it for a second period of time, for a third period of time wherein the ultraviolet light source is activated; rotating the drum for a fourth period of time at a second rotational speed following the third period of time; stopping the drum for a fifth period of time following the fourth period of time; repeating the steps of rotating the drum for a fourth period of time and stopping it for a fifth period of time, for a sixth period of time wherein the ultraviolet light source is activated.
  • the method of operation for disinfection is carried out as the last part of the operation of washing machine (e.g. after the steps of washing, rinsing and spinning).
  • ultraviolet light source is activated so as to transmit ultraviolet light (e.g. UVC light) into the drum.
  • UVC light ultraviolet light
  • washed items can get stuck in the drum.
  • ultraviolet light cannot be sent to the surface, which is stuck in the drum, of the item.
  • the operations of stop/start are respectively carried out on the drum for a third period of time.
  • the items that get stuck in the drum are enabled to be separated from the drum by way of repeating the steps of rotating the drum for a first period of time and stopping the drum for a second period of time.
  • ultraviolet light By sending ultraviolet light into the drum during said third period of time, it is ensured that a large part of the washed items are exposed to the ultraviolet light.
  • the ultraviolet light may not be sent to all the surfaces of the items within said third period of time. Therefore, after the third period of time, by way of rotating the drum at a different speed and stopping it during a sixth period of time, the washed items are unfolded so as to ensure that ultraviolet light is sent to all surfaces of these items.
  • it is ensured that all the surfaces of the washed items are disinfected by means of ultraviolet light in an easy, practical and reliable manner.
  • said first rotational speed is in the range of 50-70 rpm.
  • the first period of time is in the range of 10-20 seconds
  • the second period of time is in the range of 10-20 seconds
  • the third period of time is in the range of 1-2 minutes. In this embodiment, it is ensured that the items that get stuck in the drum are separated from the drum in an easy and practical manner.
  • the second rotational speed is in the range of 20-40 rpm.
  • the fourth period of time is in the range of 5-10 seconds
  • the fifth period of time is in the range of 180-300 seconds
  • the sixth period of time is in the range of 30-50 minutes. In this manner, all the surfaces of the item are unfolded so that ultraviolet light is adequately sent to each surface.
  • the items in the washing device are separated from the drum, and subsequently the said items are unfolded (overlapping folded / stuck surfaces are smoothed).
  • better disinfection is able to be achieved by sending ultraviolet light to all surfaces of the washed item.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Description

    Technical field
  • The present invention is related to a method of operating a washing machine that carry out a disinfection process with ultraviolet light (UV).
    • Prior Art
  • In the washing devices, such as washing machines, which are generally used for washing textile products, the process of washing is carried out using washing liquids containing washing agents such as detergent. By using the washing agents such as detergent, it is aimed to dissolve foreign substances on the item to be washed on one hand and to destroy living things such as microbes and bacteria on the other hand. Although said washing agents are generally successful in dissolving the foreign substances, they are not successful enough to destroy living things such as microbes and bacteria. Therefore, washing processes in the traditional applications cannot ensure disinfection of the washed items.
  • In the state-of-the art, there are various applications for providing disinfection in washing devices in particular such as washing machines. One of the applications in the prior art is the use of ultraviolet light (UV). In this application, ultraviolet light is transmitted by an ultraviolet light source onto the items to be washed. The ultraviolet light sent onto the items enables to destroy the living things such as microbes and bacteria that are present on the items. However, since ultraviolet light is not be able to be sent to all surfaces of the washed item, disinfection cannot be achieved at the desired level.
  • In document US2011/252578A1 a washing machine comprising a cabinet, a door, a tub installed in the cabinet, a drum rotatably installed inside the tub, an ultraviolet light source for radiating ultraviolet rays into the drum and a washing method in the same is disclosed. The washing method comprises a sterilization step, in which step, the ultraviolet lamp is activated to radiate the ultraviolet rays after a dehydration step and during the ultraviolet radiation, the motor reverses the drum alternately clockwise and counter clockwise, for evenly shaking up the laundry; and rotates at a speed having centrifugal force below 1 G, for widely transmitting sterilization effects of the ultraviolet rays. However this shaking process is unable to unfold the washed items and provide the UV light to reach to the items sufficiently.
  • In document JP2007097705A a drum-type washing machine comprising an ultraviolet irradiation device and a water level sensor to detect the water level stored in a water tank is disclosed. In this document, in order to provide the ultraviolet light to reach the clothes, water level is observed by the water level sensor, and the ultraviolet light is activated, when the water level reaches a predetermined level, which is higher than the installation height of the ultraviolet irradiation device. Since the water level is set higher than that of the ultraviolet irradiation device, the distance between the ultraviolet irradiation position and the washing item in the washing water becomes close, and the ultraviolet ray easily reaches the laundry. KR20080043721A discloses a washing machine and a related method; wherein, in order to sterilize the laundry, optically stimulated anti-bacteria agent added water is used and ultraviolet light is radiated to the laundry during washing process. JP2000157781A discloses a washing machine comprising a water tank, a drum rotatably provided in the water tank, a motor for driving the drum and a lamp for lighting the drum. In an embodiment, the lamp is an ultraviolet lamp and can be used for a tank cleaning process; in which process, the lamp is turned on and the drum is continuously driven to rotate with repetition of normal rotation and reverse rotation at a low speed for a predetermined time; then a predetermined amount of water is supplied into the water tank and then, the drum is again driven to rotate. WO2014/104796A1 discloses a washing machine using a UV LED, which can sterilize and deodorize the interior, is disclosed. During washing, rinsing, dewatering and drying processes the UV lamp can be used for sterilization. However, these documents cannot provide a solution for folded laundries.
  • In CN101328663A an anti-wrinkle cleaning method for a drum type washing machine is disclosed. During the anti-wrinkle treatment of the washing, the bacteria are sterilized by regular ultraviolet irradiation to the washing tub. The method includes the following steps: after the wrinkle treatment is started, the first cloth loosening stage is performed; after the first cloth loosening stage is completed, the first ultraviolet irradiation stage is performed; the first cloth loosening stage and the first ultraviolet irradiation stage are repeated, and the cloth loosening stage and the ultraviolet irradiation stage are cycled until the wrinkle treatment is over. However in this method, there is not sufficient time for applying ultraviolet light after the laundries are unfolded.
    • Brief Description of the Invention
  • With the present invention, there is provided a method of operating a washing machine according to the features of claim 1.
  • According to the method of operation developed with the present invention, firstly, the items in the washing device are separated from the drum, and subsequently the said items are unfolded (overlapping folded / stuck surfaces are smoothed). Thus, better disinfection is able to be achieved by sending ultraviolet light to all surfaces of the washed item.
    • Object of the Invention
  • The object of the present invention is to provide a method of operation for enhancing disinfection in washing devices that carry out disinfection with ultraviolet light.
  • Another object of the present invention is to provide a method of operation that allows for sending ultraviolet light to different surfaces of the washed items.
  • Yet another object of the present invention is to provide a method of operation, which is fast, reliable and efficient.
    • Description of the Invention
  • In the washing devices, such as washing machines, an item (e.g. a textile product) is washed using washing liquid containing a washing agent such as detergent. However, washing agents cannot adequately provide a disinfection process, especially because of the fact that the washing agents are not sufficient to destroy living organisms. Ultraviolet light can be used in washing devices to provide disinfection. For this reason, with the present invention, there is developed a method of operation for enhancing disinfection in washing machines that carry out disinfection process with ultraviolet light.
  • The method of operation developed according to the present invention is defined in the independent claim. The method is adapted for use in washing machines that comprise at least one tub in which the washing process is carried out; at least one drum located inside the tub, which rotates in the tub, and into which the items to be washed are loaded; at least one door for allowing access to the drum; and at least one ultraviolet light source, which is preferably located on the door for transmitting ultraviolet light into the drum. Said method of operation comprises the steps of transmitting ultraviolet light into the drum by activating the ultraviolet light source; rotating the drum for a first period of time at a first rotational speed; stopping the drum for a second period of time following the first period of time; repeating the steps of rotating the drum for a first period of time and stopping it for a second period of time, for a third period of time wherein the ultraviolet light source is activated; rotating the drum for a fourth period of time at a second rotational speed following the third period of time; stopping the drum for a fifth period of time following the fourth period of time; repeating the steps of rotating the drum for a fourth period of time and stopping it for a fifth period of time, for a sixth period of time wherein the ultraviolet light source is activated.
  • In an exemplary embodiment of the present invention, the method of operation for disinfection is carried out as the last part of the operation of washing machine (e.g. after the steps of washing, rinsing and spinning). Here, firstly, ultraviolet light source is activated so as to transmit ultraviolet light (e.g. UVC light) into the drum. Especially in the spinning step of the washing device, washed items can get stuck in the drum. In such a case, ultraviolet light cannot be sent to the surface, which is stuck in the drum, of the item. For this reason, in the method of operation according to the present invention, the operations of stop/start are respectively carried out on the drum for a third period of time. In other words, the items that get stuck in the drum are enabled to be separated from the drum by way of repeating the steps of rotating the drum for a first period of time and stopping the drum for a second period of time. By sending ultraviolet light into the drum during said third period of time, it is ensured that a large part of the washed items are exposed to the ultraviolet light. However, the ultraviolet light may not be sent to all the surfaces of the items within said third period of time. Therefore, after the third period of time, by way of rotating the drum at a different speed and stopping it during a sixth period of time, the washed items are unfolded so as to ensure that ultraviolet light is sent to all surfaces of these items. Thus, it is ensured that all the surfaces of the washed items are disinfected by means of ultraviolet light in an easy, practical and reliable manner.
  • In a preferred embodiment of the present invention, said first rotational speed is in the range of 50-70 rpm. According to the present invention, the first period of time is in the range of 10-20 seconds, the second period of time is in the range of 10-20 seconds, and the third period of time is in the range of 1-2 minutes. In this embodiment, it is ensured that the items that get stuck in the drum are separated from the drum in an easy and practical manner.
  • In another preferred embodiment of the invention, the second rotational speed is in the range of 20-40 rpm. According to the present invention, the fourth period of time is in the range of 5-10 seconds, the fifth period of time is in the range of 180-300 seconds, and the sixth period of time is in the range of 30-50 minutes. In this manner, all the surfaces of the item are unfolded so that ultraviolet light is adequately sent to each surface.
  • With the method of operation according to the present invention, firstly, the items in the washing device are separated from the drum, and subsequently the said items are unfolded (overlapping folded / stuck surfaces are smoothed). Thus, better disinfection is able to be achieved by sending ultraviolet light to all surfaces of the washed item.

Claims (3)

  1. A method of operating a washing machine whereby the washing machine comprises at least one tub in which the washing process is carried out; at least one drum located inside the tub, which is rotatable at different rotational speeds in the tub, and into which the items to be washed are loaded; at least one door for allowing access to the drum; and at least one ultraviolet light source for transmitting ultraviolet light into the drum, the method comprising the steps of:
    - transmitting ultraviolet light into the drum by activating the ultraviolet light source;
    - for a third period of time, wherein the ultraviolet light source is activated and which is in the range of 1-2 minutes, repeating the steps of:
    • rotating the drum for a first period of time, which is in the range of 10-20 seconds, at a first rotational speed;
    • stopping the drum for a second period of time, which is in the range of 10-20 seconds, following the first period of time;
    - following the third period of time, for a sixth period of time, wherein the ultraviolet light source is activated and which is in the range of 30-50 minutes, repeating the steps of:
    • rotating the drum for a fourth period of time, which is in the range of 5-10 seconds, at a second rotational speed, which is different from the first rotational speed;
    • stopping the drum for a fifth period of time, which is in the range of 180-300 seconds, following the fourth period of time;
  2. A method of operation according to Claim 1, characterized in that said first rotational speed is in the range of 50-70 rpm.
  3. A method of operation according to Claim 1, characterized in that the second rotational speed is in the range of 20-40 rpm.
EP17204114.7A 2017-08-29 2017-11-28 A method of operation for washing using ultraviolet light Active EP3450610B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR2017/12911A TR201712911A2 (en) 2017-08-29 2017-08-29 It's a way of working.

Publications (2)

Publication Number Publication Date
EP3450610A1 EP3450610A1 (en) 2019-03-06
EP3450610B1 true EP3450610B1 (en) 2022-07-06

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EP17204114.7A Active EP3450610B1 (en) 2017-08-29 2017-11-28 A method of operation for washing using ultraviolet light

Country Status (2)

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TR (1) TR201712911A2 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3544874B2 (en) * 1998-11-30 2004-07-21 株式会社東芝 Drum type washing machine
JP2007097705A (en) * 2005-09-30 2007-04-19 Toshiba Corp Drum washing machine
CN101929054B (en) * 2005-11-18 2012-03-21 Lg电子株式会社 Sterilizable washing machine using ultraviolet radiation and sterilizable washing method
TW200902790A (en) * 2006-11-14 2009-01-16 Matsushita Electric Ind Co Ltd Washing machine and washing method
CN101328663B (en) * 2008-07-31 2010-06-09 南京乐金熊猫电器有限公司 Crease-resist cleaning method of washings in drum-type washing machine
WO2014104796A1 (en) * 2012-12-28 2014-07-03 Seoul Viosys Co., Ltd. Washing machine having ultraviolet light-emitting diode

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Publication number Publication date
TR201712911A2 (en) 2019-03-21
EP3450610A1 (en) 2019-03-06

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