EP2604745B1 - Machine à laver le linge - Google Patents

Machine à laver le linge Download PDF

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Publication number
EP2604745B1
EP2604745B1 EP12197097.4A EP12197097A EP2604745B1 EP 2604745 B1 EP2604745 B1 EP 2604745B1 EP 12197097 A EP12197097 A EP 12197097A EP 2604745 B1 EP2604745 B1 EP 2604745B1
Authority
EP
European Patent Office
Prior art keywords
catalyst
component
tub
machine
machine according
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.)
Not-in-force
Application number
EP12197097.4A
Other languages
German (de)
English (en)
Other versions
EP2604745A2 (fr
EP2604745A3 (fr
Inventor
Leonardo Arteconi
Annalisa Ciarletta
Luca Bossi
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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 Indesit Co SpA filed Critical Indesit Co SpA
Priority to EP16168385.9A priority Critical patent/EP3081686A1/fr
Publication of EP2604745A2 publication Critical patent/EP2604745A2/fr
Publication of EP2604745A3 publication Critical patent/EP2604745A3/fr
Application granted granted Critical
Publication of EP2604745B1 publication Critical patent/EP2604745B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/02—Devices for adding soap or other washing agents
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups

Definitions

  • the present invention relates to laundry-washing machines and has been developed with particular reference to improvement of exploitation of the washing agents used in said machines for carrying out the washing treatments.
  • Washing agents used in laundry-washing machines commonly include five main groups of components, namely, surfactants, fillers, buffering-softening agents, oxidizing or whitening agents, and enzymes.
  • a detergent for a laundry-washing machine can comprise the following active ingredients, grouped by components: surfactants (such as anionic surfactants, cationic surfactants, non-ionic surfactants), oxidizing agents (such as peroxide, photo-oxidizing agents, percarbonates, perborates), enzymes (such as lipase, amylase, cellulase, protease), softening agents (such as soaps, zeolites, silicates, citrates), polymers (such as polycarbonates, polyethylene glycol, cellulose derivatives), other ingredients (such as buffers, perfumes, optical-whitening agents, foam suppressors, chelating agents).
  • surfactants such as anionic surfactants, cationic surfactants, non-ionic surfactants
  • oxidizing agents such as per
  • ingredients of the detergent are aimed at achieving two main functions in aqueous solution:
  • the active components of the detergent of particular importance are the oxidizing agents, such as sodium percarbonate and sodium perborate.
  • These bleaching agents basically have the role of decolouring stains by degrading the structure of the corresponding coloured substances.
  • percarbonate has a good bleaching power in so far as - when it is dissolved in water - it is dissociated into sodium carbonate and peroxide according to the reaction: 2Na 2 CO 3 ⁇ 3H 2 O 2(aq) ⁇ 2 Na 2 CO 3(aq) + 3H 2 O 2(aq)
  • oxidizing-agent activators such as the TAED (tetraacetylethylenediamine).
  • This molecule is an activator that enables creation of new oxidizing molecules starting from peroxide, i.e., peracids.
  • Peracetic acid or more generically an acid belonging to the family of the peracids, which is formed as product of reaction, is an oxidizing agent that is much more powerful than peroxide and enables a good bleaching action to be obtained at a temperature of around 25-35°C.
  • TAED is a reagent that is exhausted during the reaction.
  • a possible way to improve the bleaching action is to provide the washing machine with dedicated means, for adding to the washing water an additional bleaching agent, such as a perborate or a chemical carbonate in liquid or powder form, or for generating the peroxide directly.
  • an additional bleaching agent such as a perborate or a chemical carbonate in liquid or powder form
  • the use of an additional bleaching agent imposes, however, a certain complication in the production of the machine and/or in its use by the user.
  • the presence of possible means for directly generating peroxide (for example, an electrochemical cell that is able to dissociate water and air in order to release peroxide) certainly facilitates the use of the machine by the user, but complicates production thereof and management of the operating programs.
  • the aim of the present invention is to provide a laundry-washing machine in which the exploitation of oxidizing components that may be present in the washing detergent is improved in a simple and inexpensive way.
  • the idea underlying the present invention is to provide the washing machine with a catalyst that is able to perform an action similar to that of TAED already normally present in detergents available on the market, i.e., to transform oxidizing substances that may be present in the detergents into active oxygen, in the form of peracids, during the washing action.
  • the catalyst in question is associated to at least one component that is in any case already normally provided on the machine, said component being chosen from among the ones that, during operation of the machine itself, are in contact with the washing solution, i.e., water and detergent.
  • the activity of the catalyst thus enables a better bleaching of the fabrics and oxidation of their stains, without this entailing any significant complications of construction of the machine or of its control logic, without in any way complicating the activity of the end user, and without entailing risks of damage to the garments being treated.
  • the catalyst in question acts in a way synergistic with TAED or possible other activators - such as for example NOBS (nonanoyloxybenzene sulphonate), nitriles or the like - that may already be present in the detergents used, enabling increase of the active oxygen in the solution, transforming perborates and percarbonates into a peracid, such as peracetic acid.
  • activators such as for example NOBS (nonanoyloxybenzene sulphonate), nitriles or the like - that may already be present in the detergents used, enabling increase of the active oxygen in the solution, transforming perborates and percarbonates into a peracid, such as peracetic acid.
  • NOBS nonanoyloxybenzene sulphonate
  • nitriles or the like that may already be present in the detergents used
  • the catalysts used in the machine according to the invention comprise transition metals (group “d” or else group “f” of the periodic table of elements), oxides of transition metals, and insoluble salts of transition metals, provided that they present insoluble during the washing conditions, i.e., in aqueous solutions with pH comprised between 3 and 12, temperature lower than 75°C in the presence of enzymes, surfactants, and all the various chemical agents present in the formulations of the detergents.
  • the transition metal in question is cerium, and preferably the catalyst has a base of cerium oxide, more preferably with a base of cerium-oxide platinate (0.5% platinum).
  • heterogeneous catalysis where by the term "heterogeneous” is meant that the catalyst has a phase different from that of the reagents that constitute the main reaction
  • presupposes that the solution containing the washing agent is in contact with the catalyst may be associated to a stationary component of the machine according to the invention, or else to a movable component thereof or a component belonging to a movable member, it being understood that - during the steps of treatment carried out with the aid of detergent - at least the part of the component that carries the catalyst is in contact with the water-detergent mixture.
  • the catalyst is located in a corresponding point of the machine that is not reached by the garments agitated in the course of the treatment and contained in the basket of the machine.
  • Practical tests conducted by the present applicant have ascertained that said characteristic in no way reduces the activity of the catalyst aimed at transforming oxidizing substances such as perborates and percarbonates into peracids, enabling instead the integrity of the catalyst itself to be safeguarded in time. Thanks to said characteristic, the catalyst is not exposed to any rubbing and friction with the garments being treated: consequently, on the one hand, it is not subject to wear and risks of removal and, on the other hand, there is prevented the risk of the catalyst possibly abrading the garments undergoing treatment.
  • the component to which the catalyst is associated is made at least in part of synthetic material, for example a thermoplastic material, and the catalyst coats at least said part.
  • synthetic material for example a thermoplastic material
  • the material can be deposited on the surface of the synthetic component, even locally, in a very simple way, using any technique suitable for the purpose, for example selected from among painting, PVD (Plasma Vapour Deposition), CVD (Chemical Vapour Deposition), PECVD (Plasma Enhanced Chemical Vapour Deposition), cold-spraying, and the like.
  • the catalyst can be compounded or integrated directly in a synthetic material that constitutes at least part of the component in question, at its surface.
  • said solution is very simple to implement and can be obtained, for example, by mixing the catalyst and the synthetic material during moulding of the component in question or of its part of interest. Said embodiment is particularly advantageous in the case of components obtained via moulding of plastic material, in particular thermoplastic material.
  • the component to which the catalyst is associated includes at least a metal part, and the catalyst itself coats the aforesaid metal part at least partially on its surface.
  • the catalyst can be deposited on the surface of the metal part, using any technique suitable for this purpose, for example selected from among enamelling, painting, PVD, CVD, PECVD, cold-spraying, electrophoresis, and the like.
  • FIG. 1 is a schematic representation of a laundry-washing machine, designated as a whole by 1.
  • the machine 1 is a laundry-washing machine that comprises a cabinet 2, supported in a known way inside which is a tub 3.
  • a laundry basket 4 Rotatably mounted inside the tub 3 is a laundry basket 4, which can be driven in rotation via an electric motor M.
  • the basket 4 has a cylindrical wall associated to which are members for agitation of the laundry, or paddles, designated by 5.
  • the inside of the basket 4 is accessible to the user via an opening made in the cabinet 2 and closed, during operation of the machine 1, by a door, according to the known art.
  • the machine represented schematically is a front-loading machine, but it will be appreciated that the invention can be applied also in the case of top-loading machines.
  • a dispenser for washing agents of the type comprising a drawer container, for example divided into a plurality of compartments.
  • the aforesaid drawer container is slidably housed in a hopper, having a lower outlet that is connected, via a pipe 7, to the tub 3.
  • the dispenser of washing agents can be housed inside the door of the machine 1, according to a technique in itself known.
  • valve means having an inlet designed for connection with a domestic water mains supply 9.
  • the dispenser 6 and the valve means 8 are provided for causing passage of a flow of water coming from the mains 9 through the drawer container of the dispenser 6, according to a technique in itself known, in order to remove the washing agent and deliver it into tub.
  • the drawer container is divided into a plurality of compartments, the flow of water is made to pass selectively and in a controlled way in one of the compartments of the aforesaid drawer, according to the operating step of the machine 1. After the water has traversed the compartment of interest, it exits from the aforesaid hopper container entraining the washing agent, and then reaches the tub 3 via the pipe 7.
  • the valve means 8 may comprise a single solenoid valve, and the dispenser 6 may be provided with a movable nozzle, which can be controlled for directing selectively the flow admitted by the solenoid valve towards one of the aforesaid compartments; in another possible embodiment of a known type, the valve means may comprise a system of a number of solenoid valves in parallel.
  • the machine 1 can also comprise, in an inlet region of the sleeve 12, a device aimed at reducing waste of detergent, i.e., at preventing passage into the drain sleeve 12 of powdered detergent that has not yet dissolved in the water.
  • a device designated as a whole by 12a, may be of any known type; for example, it may comprise a floating body, such as a hollow body or a partition (see, for example, WO 87/02078 ).
  • Designated as a whole by 15 are the means for manual programming of the machine 1, i.e., its user interface, comprising a control panel.
  • Designated as a whole by 16 is a control unit, for example of the microcontroller type, which comprises, or to which are associated, non-volatile memory means.
  • Stored in the aforesaid memory means are the operation or management programs, which supervise execution of the treatment cycles that can be carried out by the machine and can be selected via the user interface 15.
  • the operation or management programs Stored in the aforesaid memory means are the operation or management programs, which supervise execution of the treatment cycles that can be carried out by the machine and can be selected via the user interface 15.
  • In said memory means there are obviously encoded also the instructions regarding the general functions of the machine 1.
  • the machine 1 also comprises of course all the further components necessary for its normal operation (level sensors, filters, door, safety devices, etc.), which are not represented and described herein in so far as they are not of immediate interest for the purposes of an understanding of the present invention
  • the catalyst used in the machine according to the invention - here assumed as comprising cerium oxide - may be associated to a stationary component of the machine 1, provided that this component - or at least its part carrying the catalyst - comes into contact with the water-detergent solution.
  • Figure 2 exemplifies for this purpose the case of application of the catalyst to the tub 3, and more precisely on the corresponding inner side, which is to come into contact with the washing liquid.
  • the catalyst is preferentially in a lower region of the tub 3, i.e., the area that tends to be occupied by the washing bath.
  • designated by 3a is an insert that is partially embedded in a plastic material - for example, polypropylene with fillers - of a body 3' that forms the peripheral wall of the tub 3.
  • the upper surface of the insert 3a is directly exposed towards the inside of the tub 3, and deposited at least on said surface of the insert is the catalyst, for example via a technique selected from among enamelling, painting, PVD, CVD, PECVD, cold-spraying, electrophoresis, and the like.
  • the aforesaid insert 3a may for example be made of stainless steel.
  • the catalyst may also be deposited directly on the plastic material constituting the body 3', for example in the same area that in Figure 2 is occupied by the insert 3a.
  • the catalyst deposited or an insert carrying the catalyst may also be located in the region of the sump 10.
  • the catalyst may be deposited superficially on said material.
  • Other stationary components of the machine 1, to which the catalyst may advantageously be associated belong to the means for loading the liquid into the tub, for example the hopper of the dispenser 6, in its part underlying the drawer container, and the pipe 7.
  • the catalyst can be associated also to components of the discharge means, for example the part of the sleeve 12 that directly faces the inside of the tub, at the hole 10a of Figure 2 .
  • Another stationary component that may advantageously function as substrate for the catalyst is the heating resistance 11, on which the catalyst itself can be deposited using techniques similar to those used for application of anti-lime coatings, for example selected from among enamelling, painting, PVD, CVD, PECVD, cold-spraying, electrophoresis, and the like.
  • the washing liquid containing the detergent comes at least temporarily into contact with the catalyst, in the course of operation of the machine 1, in order to carry out its own action. Instead, the catalyst does not come in contact with the laundry contained in the basket 3.
  • a possible movable member of the machine to which the catalyst may be associated is the basket 4, which in the course of its rotation passes into the washing bath present on the bottom of the tub.
  • the catalyst is positioned so as never to come into contact with the garments being treated, and for this reason, the catalyst will preferably be set on the outside of the basket 4.
  • the catalyst can be deposited superficially on plastic or metal parts of the basket, or else applied on inserts of the type previously designated by 3a.
  • the catalyst may also be positioned within the basket 3, but in a position shielded with respect to the garments. Possible advantageous embodiments in this sense are exemplified in Figure 3 .
  • the catalyst can be conveniently provided inside them in order not to come into contact with the laundry.
  • the catalyst can be deposited on an inner surface of the body 5' of the paddles, such as the one designated by 5a in Figure 3 , irrespective of whether said body is made of metal or - as more commonly is the case - of plastic material.
  • the catalyst may also being integrated in the plastic material constituting the body 5' of the paddle 5.
  • a metal plate 5b on the major surfaces of which the catalyst is deposited, as is also exemplified in Figure 3 .
  • the paddle 5 will be at least partially in contact with the washing liquid present on the bottom of the tub, as normally occurs in any laundry-washing machine.
  • the general structure of the paddle 5 is of a generally known conception, and in said perspective it is coupled to the peripheral wall of the basket 3 in the absence of particular seals. In this way, part of the water-detergent mixture can penetrate into the cavity 5c of the paddle and come into contact with the catalyst, which thus can carry out its own function.
  • the body of the paddle 5 has a plurality of holes 5d, through which the mixture that penetrates into the cavity 5c can sprinkle onto the laundry in the course of rotation of the basket.
  • the peripheral wall of the basket 3 may be provided with one or more openings in the area where the paddle 5 is mounted.
  • all the paddles 5 of the machine can include the catalyst in question.
  • the catalyst may be deposited or integrated in the part of a corresponding component directly facing the inside of the tub 3, such as for example the floating body already referred to (whether this be of a hollow or partition type).
  • the part containing the catalyst may be an external part of the body of the component (for example, in the case of the basket 4) or else an internal part (for example, in the case of the tub 3).
  • the catalyst according to the invention can of course be provided also in parts of the hydraulic circuit of the machine different from the ones exemplified previously. It is pointed out, for example, that, in the case of machines equipped with a circuit for recirculation of the washing liquid, the catalyst may be applied along a duct of said circuit. It is then clear that the catalyst may be provided also inside the drawer container of the dispenser 6, and in particular in its compartment or compartments that are dedicated to containing the usual commercially available washing agents, which contain, as has been said, perborates and/or percarbonates.
  • the catalyst according to the invention may also be applied to a container of detergent of the type designed to be set inside the basket, directly between the laundry being treated (the so-called “detergent balls"). In such a case, the catalyst will be applied inside the cavity of the aforesaid container so as not to be reached by the laundry.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detergent Compositions (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Centrifugal Separators (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Claims (9)

  1. Machine à laver le linge, comprenant une cuve de lavage (3), un panier à linge (4) monté dans ladite cuve (3) et pouvant être entraîné en rotation via un moyen formant moteur (M), un moyen de chargement (6, 7, 8) permettant de délivrer un liquide dans ladite cuve (3), un distributeur d'agent de lavage (6) permettant d'ajouter un agent de lavage au liquide, un moyen de chauffage (11) permettant de chauffer le liquide, un moyen de décharge (10, 12, 13) permettant de vidanger le liquide de la cuve (3) et un système de commande (15, 16), dans laquelle la machine à laver le linge comprend un catalyseur adapté pour favoriser la transformation de substances oxydantes qui peuvent être présentes dans l'agent de lavage en peracides, le catalyseur étant associé à un composant de la machine (1) qui, durant le fonctionnement de la machine, est en contact avec le liquide contenant l'agent de lavage,
    caractérisée en ce que ledit composant est un composant stationnaire, ledit composant stationnaire comprenant au moins un élément parmi :
    - la cuve de lavage (3) ; le catalyseur étant associé à l'intérieur de la cuve (3), en particulier dans sa région inférieure ;
    - un conduit (7) qui appartient audit moyen de chargement (6, 7, 8) ;
    - un manchon (12) qui appartient audit moyen de décharge (10-13) ;
    - une résistance (11) qui appartient audit moyen de chauffage ;
    ou est un composant mobile ou appartient à un composant mobile, ledit composant mobile comprenant au moins un élément parmi :
    - le panier à linge (4), le catalyseur étant associé à l'extérieur du panier (4) ;
    - un organe de brassage (5) monté à l'intérieur du panier (4), le catalyseur étant associé à l'intérieur de l'organe de brassage (5) ;
    - un corps mobile (12a) faisant partie d'un dispositif antigaspillage de détergent associé à un manchon de vidange (12) de la cuve (3)
    et en ce que le catalyseur est agencé de telle manière qu'il ne vient pas en contact avec le linge contenu dans le panier.
  2. Machine selon la revendication 1, dans laquelle le catalyseur comprend au moins l'un parmi un métal de transition, un oxyde d'un métal de transition et un sel insoluble d'un métal de transition.
  3. Machine selon la revendication 1, dans laquelle le métal de transition est le cérium.
  4. Machine selon l'une quelconque des revendications précédentes, dans laquelle ledit composant a au moins une partie constituée de matière de synthèse et le catalyseur revêt superficiellement au moins partiellement la partie constituée de matière de synthèse.
  5. Machine selon l'une quelconque des revendications précédentes, dans laquelle ledit composant a au moins une partie constituée de matière de synthèse et le catalyseur est combiné dans la matière de synthèse au moins à sa surface.
  6. Machine selon l'une quelconque des revendications précédentes, dans laquelle ledit composant (3 ; 5) inclut au moins une pièce en métal (3a ; 5b) et le catalyseur revêt au moins partiellement la pièce en métal (3a ; 5b).
  7. Machine selon la revendication 6, dans laquelle la pièce en métal (3a) comprend un insert de la cuve (3).
  8. Machine selon la revendication 6, dans laquelle ledit organe de brassage (5) a une cavité interne (5c) et la pièce en métal (5a) est à l'intérieur de ladite cavité (5c).
  9. Machine selon la revendication 1, dans laquelle ledit composant comprend un contenant pour agent de lavage.
EP12197097.4A 2011-12-15 2012-12-13 Machine à laver le linge Not-in-force EP2604745B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16168385.9A EP3081686A1 (fr) 2011-12-15 2012-12-13 Machine à laver le linge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001154A ITTO20111154A1 (it) 2011-12-15 2011-12-15 Macchina per il lavaggio di lavabiancheria

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP16168385.9A Division EP3081686A1 (fr) 2011-12-15 2012-12-13 Machine à laver le linge
EP16168385.9A Division-Into EP3081686A1 (fr) 2011-12-15 2012-12-13 Machine à laver le linge

Publications (3)

Publication Number Publication Date
EP2604745A2 EP2604745A2 (fr) 2013-06-19
EP2604745A3 EP2604745A3 (fr) 2014-01-08
EP2604745B1 true EP2604745B1 (fr) 2016-06-22

Family

ID=45541012

Family Applications (2)

Application Number Title Priority Date Filing Date
EP12197097.4A Not-in-force EP2604745B1 (fr) 2011-12-15 2012-12-13 Machine à laver le linge
EP16168385.9A Withdrawn EP3081686A1 (fr) 2011-12-15 2012-12-13 Machine à laver le linge

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16168385.9A Withdrawn EP3081686A1 (fr) 2011-12-15 2012-12-13 Machine à laver le linge

Country Status (2)

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EP (2) EP2604745B1 (fr)
IT (1) ITTO20111154A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20131099A1 (it) * 2013-12-31 2015-07-01 Indesit Co Spa Macchina lavasciugatrice con sistema di prevenzione dell¿intasamento di un filtro dell¿aria
CN106498666B (zh) * 2016-12-26 2019-07-12 珠海格力电器股份有限公司 消泡装置、洗衣机及其控制方法
JP6642473B2 (ja) * 2017-02-07 2020-02-05 株式会社豊田中央研究所 電解用アノード

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4821537A (en) 1985-10-03 1989-04-18 Miele & Cie. Gmbh & Co. Washing machine or washing drying machine with devices to avoid losses of washing agent
US6513180B2 (en) * 2001-05-10 2003-02-04 Maytag Corporation Washing machine incorporating a bleach activator

Also Published As

Publication number Publication date
ITTO20111154A1 (it) 2013-06-16
EP3081686A1 (fr) 2016-10-19
EP2604745A2 (fr) 2013-06-19
EP2604745A3 (fr) 2014-01-08

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