EP0048519B1 - Vorrichtung und Verfahren zum mechanischen Spülen von Geschirr - Google Patents

Vorrichtung und Verfahren zum mechanischen Spülen von Geschirr Download PDF

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Publication number
EP0048519B1
EP0048519B1 EP81201037A EP81201037A EP0048519B1 EP 0048519 B1 EP0048519 B1 EP 0048519B1 EP 81201037 A EP81201037 A EP 81201037A EP 81201037 A EP81201037 A EP 81201037A EP 0048519 B1 EP0048519 B1 EP 0048519B1
Authority
EP
European Patent Office
Prior art keywords
wash liquor
wash
rinse
dishes
tank
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
Application number
EP81201037A
Other languages
English (en)
French (fr)
Other versions
EP0048519A1 (de
Inventor
Norman Jason Pritchard
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.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
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
Application filed by Unilever PLC, Unilever NV filed Critical Unilever PLC
Priority to AT81201037T priority Critical patent/ATE10802T1/de
Publication of EP0048519A1 publication Critical patent/EP0048519A1/de
Application granted granted Critical
Publication of EP0048519B1 publication Critical patent/EP0048519B1/de
Expired legal-status Critical Current

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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
    • A47L15/0076—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals
    • A47L15/0078—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals with a plurality of fluid recirculation arrangements, e.g. with separated washing liquid and rinsing liquid recirculation circuits
    • 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
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • A47L15/0015—Washing processes, i.e. machine working principles characterised by phases or operational steps other treatment phases, e.g. steam or sterilizing phase
    • 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
    • A47L15/4236—Arrangements to sterilize or disinfect dishes or washing liquids
    • 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
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids
    • 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
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/16—Agitation of cleaning liquid by impeller

Definitions

  • This invention relates to an improved process and apparatus for the mechanical washing of dishes.
  • the term “dishes” is used here to include all sorts of crockery, glassware, cutlery and kitchen utensils.
  • Dishwashing machines wherein the dishes are placed on a horizontal rack or conveyor chain above an open reservoir or wash tank containing a heated wash liquor comprising an aqueous cleaning liquid and which operate by pumping and spraying said aqueous cleaning liquid onto the dishes for a predetermined period followed by a rinsing programme wherein the washed dishes are sprayed with warm water, optionally mixed with a rinse aid, are known.
  • Some multi-tank machine types do not have a power rinse section so that the final rinse water cascades into the wash tank.
  • These machines generally operate at a relatively high wash temperature of about 60°C and a rinse temperature of about 80°C.
  • the cleaning agents used in industrial mechanical dishwashing can be powders or liquids and are generally blends of two or more of the following compounds: sodium- or potassium triphosphate, sodium metasilicate, sodium- or potassium hydroxide, sodium carbonate, sodium sulphate, with or without a chlorine bleaching agent.
  • the invention provides a process for the mechanical washing of dishes, wherein said dishes are placed on a horizontal rack or conveyor chain over an open reservoir or wash tank containing a wash liquor which is pumped and sprayed through wash liquor spraying devices placed over and/or under the rack or conveyor chain onto the dishes, subsequently followed by a rinse cycle wherein said washed dishes are sprayed with water optionally mixed with a rinse aid through rinse water spraying devices placed over and/or under the rack or conveyor chain, characterized in that a bleaching and/or disinfecting agent (sanitizer) is introduced in the wash liquor before the start of the rinse cycle at a point in the wash liquor line before the wash liquor spraying devices, thereby controlling the amount of sanitizer in the wash liquor at a sufficient strength.
  • a bleaching and/or disinfecting agent sanitizer
  • an apparatus for the mechanical washing of dishes comprising an open wash liquor tank, a moving or stationary horizontal rack for articles (dishes) to be washed which is placed above the wash liquor tank, a pump connected to the wash liquor tank for spraying wash liquor onto the articles through spray arms situated above and below the rack, an overflow to maintain the wash liquor level in the tank, and optionally a heating element mounted in the tank for heating the wash liquor, characterized in that there is provided a means for injecting a bleaching and/or disinfecting agent (sanitizer) to the wash liquor at a point in the wash liquor line before or where the flow is split between the upper and lower spray arms.
  • a bleaching and/or disinfecting agent disinfecting agent
  • injection points are provided with one-way valves.
  • Bleaching and/or disinfecting agents usable in the present invention are, for example, alkalimetal hypochlorite and hydrogen peroxide. Also peroxy acids or peroxy acid precursors can be used. Depending on the manner of dosing, the. sanitizer may be used in any physical form for convenient dosing, e.g. a liquid or a solid. If alkalimetal hypochlorite is used, it is preferably introduced in the form of an aqueous solution at a concentration of about 6-12% by weight. A preferred alkalimetal hypochlorite is sodium hypochlorite.
  • hydrogen peroxide is used, it is introduced as an aqueous hydrogen peroxide solution, for example at a strength of about 3-60% by weight.
  • hypochlorite in mechanical dishwashing systems has been suggested via the rinse water.
  • addition of hypochlorite or any other oxidative disinfectant to the final rinse water is prohibited by law, owing to the risk of the formation of undesirable residues on washed articles.
  • the present invention avoids the above risk and is safe in this respect.
  • the technical problem to solve is how and when to dose the bleaching and/or disinfecting agent solution of a fixed concentration to obtain the most cost-effective bleaching and/or disinfecting action.
  • the reduction of hypochlorite for example by organic soil in the wash liquor, will mean that, in order to maintain a constant active chlorine level, a regular dosing of hypochlorite would be needed but at a rate which varies with its reduction by the organic soil present in the wash liquor. It was found that for a satisfactory bleaching and sanitizing effect the active chlorine content in the wash liquor should preferably be maintained at a level of at least 30 ppm, particularly at a level within the range of 30-50 ppm.
  • the bleaching and/or disinfecting agent is dosed during the wash process in pulses, preferably at least 30 seconds before the start of the rinse cycle, the amount being calculated on the basis of the amount of rinse water per rack or per hour and adjusted by means of the pulse frequency of the pump.
  • hypochlorite solution 6% active chlorine
  • the dosing pump for the bleaching and/or disinfecting agent may be activated by push button to deliver an extra "initial dosing" (i.e. a dose, yielding at least 30 ppm active chlorine level in a fresh liquor).
  • an extra amount of sanitizer may be needed to allow for variations in the intervals between two wash processes and in the soil load or soil composition.
  • a main wash product that contains more sequestrant than most conventional mechanical dishwashing products is used to improve the hygienic safety of the process even further.
  • Both powder and liquid cleaning products can be used in the process of the invention.
  • the powder product may be dosed via any commercially known "powder dosing" system, e.g. an overflowing reservoir system, and the liquid product may be dosed by a suitable pump.
  • the product concentration can be kept within acceptable limits via a conductivity cell in the wash liquor and controller.
  • the aqueous cleaning liquid in the wash tank is kept at a strength at least equivalent to 500 mg/litre sodium triphosphate per 1 mole M- 3 water hardness and 200 mg/litre NaOH.
  • the liquid bleaching and/or disinfecting agent e.g. sodium hypochlorite solution or hydrogen peroxide solution
  • a diaphragm pump which is triggered by an electrical connection to the wash pump via an electrical device.
  • the sanitizer product is dosed at a point in the wash arm of the machine before which or where the flow is split between upper and lower spray arms.
  • This injection point with a one-way valve is chosen to minimize the delay between sanitizer addition and contact with the articles being washed (i.e. to deliver a maximum instantaneous level of active chlorine or active oxygen on the articles).
  • the dosing pump for the sanitizer is conveniently operable by push button for the initial dose (and intermittent bleaching when required), whereafter a fixed volume (about 3 g for 6% hypochlorite solution) is dosed per rack, starting e.g. 30 seconds before the end of the wash cycle. This dose may be injected in pulses of 1 g at time intervals, which will depend on the duration of the wash cycle.
  • the rinse aid can be dosed, as in the conventional processes, with a Venturi or electrically operated pump.
  • the process of the invention not only avoids the risk of formation of undesirable residues on washed articles arising from the sanitizer, but is also operable at lower wash and rinse temperatures, producing bleaching and hygienic results that are at least equal to the results obtained with conventional high-temperature (60°/80°C) mechanical dishwashing processes.
  • the wash liquor temperature is preferably maintained at a level of about 50° to 55°C, and the rinse water temperature is kept at a level of about 60° to 65°C.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)
  • Automatic Disk Changers (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Mechanical Control Devices (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Claims (7)

1. Verfahren zum mechanischen Spülen von Geschirr, wobei das Geschirr (C) auf einer horizontalen Ablage oder Förderkette über einem offenen Behälter oder Spültank (A) angeordnet wird, der eine Spülflüssigkeit enthält, die gepumpt und durch Spülflüssigkeitssprüheinrichtungen (K) über und/oder unter die Ablage oder Förderkette auf das Geschirr (C) gesprüht wird, woran ein Klarspülzyklus anschließt, wobei das gespülte Geschirr (C) mit Wasser gegebenenfalls versetzt mit einer Klarspülhilfe durch über und/oder unter der Ablage oder Förderkette angeordnete Wassersprüheinrichtungen (B) besprüht wird, dadurch gekennzeichnet, daß ein Bleich- und/oder Desinfektionsmittel (Sanitizer) in die Spülflüssigkeit vor dem Beginn des Klarspülzyklus an einem Punkt in der Spülflüssigkeitsleitung (J) vor dem Spülflüssigkeitssprüheinrichtungen (K) eingeführt wird, wobei die Menge des Sanitizers in der Spülflüssigkeit mit einer ausreichenden Stärke eingestellt wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Sanitizer ein Alkalimetallhypochlorit ist.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Gehalt an aktivem Chlor in der Spülflüssigkeit auf einem Level von 30-50 ppm gehalten wird.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Sanitizer mindestens 30 Sekunden vor dem Beginn des Klarspülzyklus in die Spülflüssigkeit eingeführt wird.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Spülflüssigkeit eine Stärke mindestens äquivalent zu 500 mg/Liter Natriumtriphosphat pro Mol M-3 Wasserhärte und 200 mg/Liter Natriumhydroxid hat.
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Spülflüssigkeit auf einer Temperatur von etwa 50°-55°C gehalten wird.
7. Vorrichtung zum mechanischen Spülen von Geschirr, mit einem offenen Spülflüssigkeitstank (A), einer sich bewegenden oder stationären horizontalen Ablage für zu spülende Gegenstände (Geschirr) (C), die oberhalb des Spülflüssigkeitstanks (A) angeordnet ist, einer an den Spülflüssigkeitstank (A) angeschlossenen Pumpe (L) zum Aufsprühen der Spülflüssigkeit auf die Gegenstände (C) durch Sprüharme (K) hindurch, die oberhalb und unterhalb der Ablage angeordnet sind, einem Überlauf (V) zur Aufrechterhaltung des Spülflüssigkeitslevels in dem Tank und gegebenenfalls einem in dem Tank angeordneten Heizelement (0) zum Aufheizen der Spülflüssigkeit, dadurch gekennzeichnet, daß ein Mittel zum Einspritzen eines Bleich- und/oder Desinfektionsmittels (Sanitizer) zu der Spülflüssigkeit an einem Punkt in der Spülflüssigkeitsleitung (J) vorgesehen ist, bevor oder wo der Strom zwischen den oberen und unteren Sprüharmen aufgeteilt ist.
EP81201037A 1980-09-24 1981-09-17 Vorrichtung und Verfahren zum mechanischen Spülen von Geschirr Expired EP0048519B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81201037T ATE10802T1 (de) 1980-09-24 1981-09-17 Vorrichtung und verfahren zum mechanischen spuelen von geschirr.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8030852 1980-09-24
GB8030852 1980-09-24

Publications (2)

Publication Number Publication Date
EP0048519A1 EP0048519A1 (de) 1982-03-31
EP0048519B1 true EP0048519B1 (de) 1984-12-19

Family

ID=10516260

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201037A Expired EP0048519B1 (de) 1980-09-24 1981-09-17 Vorrichtung und Verfahren zum mechanischen Spülen von Geschirr

Country Status (6)

Country Link
EP (1) EP0048519B1 (de)
AT (1) ATE10802T1 (de)
CA (1) CA1181662A (de)
DE (1) DE3167847D1 (de)
FI (1) FI812951L (de)
NO (1) NO813231L (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11786100B2 (en) 2021-04-23 2023-10-17 Illinois Tool Works Inc. Dishwasher, in particular in the form of a counter module for a counter system
US11889964B2 (en) 2020-03-31 2024-02-06 Illinois Tool Works Inc. Counter system for transferring in particular at least partially unpackaged foodstuffs, and method for receiving customer-specific and in particular personalized orders in a counter system
US11930981B2 (en) 2020-03-12 2024-03-19 Illinois Tool Works Inc. Dishwasher for cleaning items of washware in the form of drinking vessels
US12016505B2 (en) 2020-10-06 2024-06-25 Illinois Tool Works Inc. Dishwasher for cleaning items in the shape of drinking vessels and counter module with such a dishwasher

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629703A2 (fr) * 1987-10-16 1989-10-13 Courty Claude Barbecue compact
DE3812109A1 (de) * 1988-04-12 1989-10-26 Schwarzwaelder Uhrwerke Fabrik Reinigungsmittelzufuehrvorrichtung fuer haushaltsgeraete, insbesondere geschirrspueler
GB8810628D0 (en) * 1988-05-05 1988-06-08 Unilever Plc Mechanical warewashing process
DE3832885A1 (de) * 1988-09-28 1990-04-05 Ifah Inst Fuer Angewandte Hygi Verfahren zum maschinellen reinigen, desinfizieren und klarspuelen von geschirr und dafuer geeignetes mittel
SE469056B (sv) * 1989-12-22 1993-05-10 Electrolux Ab Nivaaregleringsanordning vid en diskmaskin
US5282901A (en) * 1990-02-28 1994-02-01 Kay Chemical Company Method for dispensing different amounts of detergent in a warewash machine depending on a fill cycle or a rinse cycle
US5056542A (en) * 1990-02-28 1991-10-15 Kay Chemical Company Apparatus for dispensing detergent in a warewash machine
DE4233934C2 (de) * 1992-10-08 1996-02-29 Bosch Siemens Hausgeraete Vorrichtung zum Spülen von Spülgut
IT1266676B1 (it) * 1993-11-04 1997-01-09 Velox Barchitta Snc Di Butti C Apparecchio per lavaggio-asciugatura di vasellame,a due camere, compatto
FR2752426A1 (fr) * 1996-08-16 1998-02-20 Parizzi Maurice Procede pour la desinfection des tambours et cuves et accessoires de vidange des machines a laver le linge ou la vaisselle
FR2754184B1 (fr) * 1996-10-08 1998-11-06 Parizzi Maurice Procede pour la desinfection des tambours et cuves et accessoires de vidange des machines a laver le linge ou la vaisselle
DE10358969A1 (de) 2003-12-16 2005-07-21 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit einer Dosiervorrichtung für Zuschlagmittel und zugehöriges Verfahren
EP2586352A1 (de) * 2011-10-24 2013-05-01 E' Cosi' S.R.L. Einheit zum Waschen von Geschirr und dergleichen
CN116327066B (zh) * 2023-04-21 2024-05-31 苏州厨芯科技有限公司 一种清洗设备化学药剂投放的控制方法、装置及清洗设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1503866A1 (de) * 1965-06-21 1969-06-12 Rowenta Metallwarenfab Gmbh Geschirrspuelmaschine
US4147558A (en) * 1977-09-21 1979-04-03 Hobart Corporation Method for rinsing and chemically sanitizing food ware items
US4218264A (en) * 1979-03-09 1980-08-19 Federighi George B Dishwasher utilizing pump impeller suction for feeding detergent, sanitizing agent and rinse aid in timed sequences

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11930981B2 (en) 2020-03-12 2024-03-19 Illinois Tool Works Inc. Dishwasher for cleaning items of washware in the form of drinking vessels
US11889964B2 (en) 2020-03-31 2024-02-06 Illinois Tool Works Inc. Counter system for transferring in particular at least partially unpackaged foodstuffs, and method for receiving customer-specific and in particular personalized orders in a counter system
US12016505B2 (en) 2020-10-06 2024-06-25 Illinois Tool Works Inc. Dishwasher for cleaning items in the shape of drinking vessels and counter module with such a dishwasher
US11786100B2 (en) 2021-04-23 2023-10-17 Illinois Tool Works Inc. Dishwasher, in particular in the form of a counter module for a counter system

Also Published As

Publication number Publication date
FI812951L (fi) 1982-03-25
ATE10802T1 (de) 1985-01-15
EP0048519A1 (de) 1982-03-31
DE3167847D1 (en) 1985-01-31
NO813231L (no) 1982-03-25
CA1181662A (en) 1985-01-29

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