EP0282214B2 - Verfahren zum Reinigen von Geschirr - Google Patents

Verfahren zum Reinigen von Geschirr Download PDF

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Publication number
EP0282214B2
EP0282214B2 EP88301755A EP88301755A EP0282214B2 EP 0282214 B2 EP0282214 B2 EP 0282214B2 EP 88301755 A EP88301755 A EP 88301755A EP 88301755 A EP88301755 A EP 88301755A EP 0282214 B2 EP0282214 B2 EP 0282214B2
Authority
EP
European Patent Office
Prior art keywords
sprayed
cleaning
cleaning formulation
zone
formulation
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
EP88301755A
Other languages
English (en)
French (fr)
Other versions
EP0282214B1 (de
EP0282214A1 (de
Inventor
Jochen Blecher
Berthold Langenstein
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.)
Diversey Inc
Original Assignee
Unilever NV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6322513&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0282214(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Unilever NV filed Critical Unilever NV
Priority to DE1988301755 priority Critical patent/DE282214T1/de
Priority to AT88301755T priority patent/ATE68087T1/de
Publication of EP0282214A1 publication Critical patent/EP0282214A1/de
Publication of EP0282214B1 publication Critical patent/EP0282214B1/de
Application granted granted Critical
Publication of EP0282214B2 publication Critical patent/EP0282214B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0055—Metering or indication of used products, e.g. type or quantity of detergent, rinse aid or salt; for measuring or controlling the product concentration
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane

Definitions

  • This invention relates to a machine dishwashing process; more particularly, it relates to an improvement in continuous or non-continuous machine dishwashing, whether conducted using a single tank, multitank or conveyor type machine.
  • tableware or cookware such as dishes soiled with food remains, trays, cutlery and lipstick-smeared glasses, is intensively sprayed with water in a prewash zone or prewash cycle.
  • the water used for the prewash may be cold or preheated fresh water or cooling water from a vapour condensation process, but is generally overflow water of a wash liquor, which is generally sprayed onto the articles under relatively low pressure and in relatively large amounts using suitably located spray nozzles.
  • the articles enter the actual wash zone or wash cycle, where they are again vigorously sprayed this time with a wash liquor.
  • the wash liquor is generally water at a temperature of from 50 to 60°C to which a liquid or powder-form detergent is added.
  • a liquid or powder-form detergent is added to water to provide from 0.1 to 0.3 weight percent of active cleaning agent in solution.
  • This resulting wash liquor is sprayed onto the articles by pump means through lower and upper nozzles and, in some cases, through additional lateral nozzles.
  • the soil present on the articles is removed or at least swollen or softened and partially dissolved by the wash liquor. In following rinse zones or cycles, the swollen or softened food remains are removed and, at the same time, the wash liquor is rinsed off by water.
  • any residues of the wash liquor are removed by water at a temperature of up to about 85°C.
  • the final-rinse water consists of fresh water with an added rinse aid, which ensures that only an ultrathin film of water remains on the articles, which can evaporate in a following drying zone.
  • GB-A-1,099,701 which may be regarded as the most pertinent prior art, relates to a process for cleaning a surface in which a liquid medium comprising a detergent in a concentration of at least 0.5% in which are suspended substantially water-impregnable non-abrasive inert particles is sprayed onto the surface.
  • a liquid medium comprising a detergent in a concentration of at least 0.5% in which are suspended substantially water-impregnable non-abrasive inert particles is sprayed onto the surface.
  • An object of the present invention is to provide surprisingly advantageous dishwashing.
  • the improved efficiency of cleaning obtainable may reduce labour, water and chemical consumption, hence lower pollution and rejects, while ensuring satisfactory cleaning even in adverse conditions.
  • the present invention provides a machine dishwashing process which comprises spraying onto at least partially soiled articles a highly concentrated aqueous cleaning formulation comprising at least 0.5 weight percent of one or more active cleaning agents and, after a contact time of at least 2 seconds, removing the cleaning formulation and soil in one or more subsequent stages.
  • a dishwashing machine may be adapted to effect such a process, for example by addition of extra spray nozzles and associated systems and/or by modifications to the control systems of the machine.
  • the aqueous cleaning formulation may be derived from powder-form or liquid materials.
  • the sprayed cleaning formulation comprises at least 0.5 weight percent of one or more active cleaning agents. While, say, 30 weight percent might be regarded as an upper limit, the critical factor is that the formulation must remain sprayable.
  • the sprayed cleaning formulation comprises from 0.8 to 10 weight percent, more preferably from 0.9 to 3 weight percent, of one or more active cleaning agents.
  • a contact time of at least 2 seconds will be sufficient for the desired chemical, as opposed to mechanical, action. In preferred embodiments, this may be from 5 to 100 seconds, in particular from 8 to 25 seconds. So as to provide the desired prolonged intimate contact or “saturation", the "mechanical effect" of spraying is at least minimised, if not avoided. During this contact time, the articles being washed are not deliberately sprayed.
  • the claimed machine dishwashing process optionally comprises one or more prewash cycles or zones in order, for example to remove heavy soil, one or more wash zones and one or more rinse zones.
  • the unusually high concentration cleaning solution is sprayed somewhere prior to the final rinse, commonly as at least part of a wash cycle or in a wash zone.
  • cleaning agents While all of the cleaning agents required may be included in the sprayed concentrate, it may be advantageous to introduce additional cleaning formulation in a conventional manner at some stage of the process.
  • This further material is generally not the same as the sprayed concentrate, but may merely be the same composition further diluted.
  • the present system also enables chemicals which would normally be incompatible when mixed in a single product to be used in conjunction, for example oxidising agents, such as hypochlorite, may be used in the spray with, for example, water conditioning agents, such as NTA (nitrilotriacetate) being introduced later.
  • oxidising agents such as hypochlorite
  • water conditioning agents such as NTA (nitrilotriacetate) being introduced later.
  • the concentrated cleaning formulation is generally sprayed more or less throughout the appropriate part of the dishwashing process, it may be used intermittently or occasionally, for example during the wash cycle in a non-conveyor type machine.
  • the aqueous cleaning formulation sprayed must be flowable, but may be in the form of a solution, emulsion or slurry, for example.
  • a basic cleaning formulation will comprise a source of alkalinity and a source of sequestering activity.
  • Such formulations may be adapted to combat particular problems. For example, tea-stain removal might suggest the inclusion of bleaching agents, while products based on amylase may be useful for starch removal without alkalinity.
  • a machine for carrying out the present process may be a conveyor transport machine with an optional prewash zone, a wash zone, a rinse zone, a final rinse zone and a drying zone. Fresh water is only supplied to the final-rinse zone, subsequently passing cascade-fashion towards the prewash zone in countercurrent to the direction of transport of the dishes.
  • a simple product fairly efficient in removing built-up starch residues and stains may be formulated from the following:
  • Such a product may be blended with water in-line before being sprayed at a dilution of about 2.5 % through suitable spray nozzles situated within the wash zone immediately before or after the conventional wash zone. Sprayed ware may then pass through part of the wash zone with the pumps turned off (unless there is already sufficient separation between zones) so as to allow a contact time of about 15 seconds, before reaching a further wash or rinse zone. Further detergent may be added by conventional means at other stages to provide additional destaining and prevention of incrustation of machine parts. Thereafter, the ware passes to a final rinse stage where rinse aid may be introduced.
  • each nozzle may be delivering as little as 6 l/hour and typically there will be from 3 to 10 nozzles.
  • the system is arranged or adapted to ensure that nothing disturbs the desired prolonged intimate contact.
  • the speed of the conveyor belt is advantageously selected so that the contact time of the detergent solution, depending on its concentration, is from 2 to 100 seconds, generally about 10 seconds.
  • Such a contact time and the high concentration of the detergent solution ensure that all food remains on the dishes, especially grease (fats), starch, stains and protein, are completely removed and bacteria destroyed.
  • the detached food remains, together with the detergent solution sprayed on, are washed off by the subsequent stages using conventional spray nozzles, the wash liquor consisting of overflow water from the rinse zone and of rinsed-off, concentrated detergent solution and any additional dosed complementary cleaning formulation.
  • the wash liquor consisting of overflow water from the rinse zone and of rinsed-off, concentrated detergent solution and any additional dosed complementary cleaning formulation.
  • any loosened food and soil remains still present on the dishes and residues of the wash liquor are rinsed off with clear water at a temperature of about 70°C.
  • clear water at a temperature of about 70°C.
  • fresh water at a temperature of about 85°C with rinse aid added ensures that only a thin film of water remains on the dishes, which dries rapidly in the following drying zone either through the heat of the dishes or by introduction of hot air.

Landscapes

  • Detergent Compositions (AREA)
  • Washing And Drying Of Tableware (AREA)

Claims (9)

  1. Verfahren zur maschinellen Reinigung von Geschirr, wobei ein oder mehrere optionale Vorwaschgänge oder -zonen, ein oder mehrere Waschzyklen oder -zonen und ein oder mehrere Spülzyklen oder -zonen vorhanden sind, umfassend das Aufsprühen einer hochkonzentrierten wäßrigen Reinigungsformulierung in einem feinen, sanften, nebelähnlichen Spray aus einer Vielzahl von Sprühdüsen in der Maschine auf zumindest teilweise verschmutzte Gegenstände, wobei die Reinigungsformulierung zumindest 0,5 Gew.-% eines oder mehrerer aktiver Reinigungsmittel umfaßt und, nach einer Kontaktzeit von 2 bis 100 Sekunden, während der die Gegenstände nicht absichtlich besprüht werden, die Entfernung der Reinigungsformulierung und des Schmutzes in einem oder mehreren nachfolgenden Schritten, wobei die Reinigungsformulierung vor dem letzten Spülzyklus oder der letzten Spülzone aufgesprüht wird.
  2. Verfahren nach Anspruch 1, wobei die aufgesprühte Reinigungsformulierung 0,8 bis 10 Gew.-%, bevorzugt 0,9 bis 3 Gew.-%, eines oder mehrerer aktiver Reinigungsmittel aufweist.
  3. Verfahren nach Anspruch 1 oder 2, wobei die Kontaktzeit 5 bis 100 Sekunden, bevorzugt 8 bis 25 Sekunden, beträgt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei die Reinigungsformulierung in einer solchen Menge und in einer solchen Weise aufgesprüht wird, um die Oberflächen der verschmutzten Gegenstände im wesentlichen vollständig damit in Kontakt zu bringen.
  5. Verfahren nach Anspruch 4, wobei das Volumen der aufgesprühten Reinigungsformulierung und/oder die Zahl und/oder die Anordnung der Sprühdüsen derart ist, daß durch das Aufsprühen eines geringen Volumens und das Aufsprühen mit geringer Intensität ein im wesentlichen vollständiger Kontakt und eine im wesentlichen gleichmäßige Verteilung erreicht wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei, in einer Maschine vom Transporttyp, die Geschwindigkeit und/oder die Bewegung des Transportbandes und/oder die Beladung derart ist, daß durch das Aufsprühen einer geringen Menge und das Aufsprühen mit geringer Intensität ein im wesentlichen vollständiger Kontakt und eine im wesentlichen gleichmäßige Verteilung erreicht wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, wobei ein Waschzyklus oder eine Waschzone das Aufsprühen der Reinigungsformulierung umfaßt.
  8. Verfahren nach einem der Ansprüche 1 bis 7, wobei eine weitere, bevorzugt nicht-identische Reinigungsformulierung in üblicher Weise eingeführt wird.
  9. Verfahren nach Anspruch 8, wobei die Reinigungsformulierungen einander ergänzen.
EP88301755A 1987-03-07 1988-03-01 Verfahren zum Reinigen von Geschirr Expired - Lifetime EP0282214B2 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1988301755 DE282214T1 (de) 1987-03-07 1988-03-01 Verfahren zum reinigen von geschirr.
AT88301755T ATE68087T1 (de) 1987-03-07 1988-03-01 Verfahren zum reinigen von geschirr.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873707366 DE3707366A1 (de) 1987-03-07 1987-03-07 Verfahren zur kontinuierlichen oder diskontinuierlichen maschinellen reinigung von gebrauchsgeschirr
DE3707366 1987-03-07

Publications (3)

Publication Number Publication Date
EP0282214A1 EP0282214A1 (de) 1988-09-14
EP0282214B1 EP0282214B1 (de) 1991-10-09
EP0282214B2 true EP0282214B2 (de) 1999-09-01

Family

ID=6322513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88301755A Expired - Lifetime EP0282214B2 (de) 1987-03-07 1988-03-01 Verfahren zum Reinigen von Geschirr

Country Status (6)

Country Link
EP (1) EP0282214B2 (de)
AU (1) AU604854B2 (de)
CA (1) CA1324945C (de)
DE (2) DE3707366A1 (de)
DK (1) DK171583B2 (de)
ES (1) ES2026250T5 (de)

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Also Published As

Publication number Publication date
EP0282214B1 (de) 1991-10-09
CA1324945C (en) 1993-12-07
DK114888A (da) 1988-09-04
AU604854B2 (en) 1991-01-03
ES2026250T3 (es) 1992-04-16
DE3707366A1 (de) 1988-09-15
DK114888D0 (da) 1988-03-03
AU1257688A (en) 1988-09-01
DK171583B2 (da) 2003-04-14
EP0282214A1 (de) 1988-09-14
ES2026250T5 (es) 1999-12-16
DK171583B1 (da) 1997-02-10
DE3865324D1 (de) 1991-11-14

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