EP0700265A1 - Procede et dispositif de lavage de la vaisselle en machine - Google Patents

Procede et dispositif de lavage de la vaisselle en machine

Info

Publication number
EP0700265A1
EP0700265A1 EP94918791A EP94918791A EP0700265A1 EP 0700265 A1 EP0700265 A1 EP 0700265A1 EP 94918791 A EP94918791 A EP 94918791A EP 94918791 A EP94918791 A EP 94918791A EP 0700265 A1 EP0700265 A1 EP 0700265A1
Authority
EP
European Patent Office
Prior art keywords
enzyme
dosing
cleaning
washing
detergent
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.)
Granted
Application number
EP94918791A
Other languages
German (de)
English (en)
Other versions
EP0700265B2 (fr
EP0700265B1 (fr
Inventor
Jacques Breyer
Guenter Hellmann
Dieter Hemm
Klaus Wilbert
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.)
Ecolab GmbH and Co OHG
Original Assignee
Henkel Ecolab GmbH and Co KG
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=27205119&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0700265(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE4324106A external-priority patent/DE4324106C1/de
Application filed by Henkel Ecolab GmbH and Co KG filed Critical Henkel Ecolab GmbH and Co KG
Publication of EP0700265A1 publication Critical patent/EP0700265A1/fr
Application granted granted Critical
Publication of EP0700265B1 publication Critical patent/EP0700265B1/fr
Publication of EP0700265B2 publication Critical patent/EP0700265B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants

Definitions

  • the invention is directed to a method for machine dishwashing in commercial dishwashing machines, in which a cleaning agent and an additional active ingredient that supports its action are added to the washing or washing liquor of the dishwasher. Furthermore, the invention relates to a device for performing the method, which has a detergent dosing system and a dosing system for another active ingredient with an associated pump and pump control.
  • a commercial dishwasher usually contains a plurality of tanks arranged one behind the other, from which washing or washing liquor is sprayed against the dishes passing through the dishwasher.
  • the tanks are placed in a cascade-like manner, the washing or washing liquor passing through the tanks one after the other from the dishes outlet end to the dishes inlet end, so that the degree of contamination of the washing or washing liquor increases from the outlet end to the inlet end.
  • Dishwashers supplied fresh water.
  • the required amount of cleaning agent is metered into at least one wash tank, also known as a metering tank.
  • the detergent is usually metered in automatically as a function of the conductivity or the pH of the wash liquor or, if liquid or powdery detergent already dissolved in water is added, if appropriate also by means of a time-controlled metering pump.
  • DE-AS 12 85 087 Also known from DE-AS 12 85 087 is a method for machine dishwashing, in which an alkaline detergent is metered into the main rinse cycle and an enzy-containing rinse aid, in particular amylase-containing rinse aid, is metered into the dishwasher in the rinse and optionally pre-rinse cycle . This is done in order to reduce starch formed on the dishes in the rinse and, if appropriate, pre-rinse cycle.
  • an enzyme-containing rinse aid in the main rinse cycle is not possible, since the alkalinity of the detergent would destroy the fermentation immediately.
  • the object of the invention is to provide a solution which prevents the formation of a starch coating on the dishes during machine dishwashing in commercial dishwashers.
  • a cleaning agent is a lower alkali cleaner, in particular based on phosphate or nitrilotriacetic acid or its salts (NTA), and an enzyme, preferably carbohydrate-degrading enzyme, as a further active ingredient. containing, in particular amylase-containing, cleaning enhancers.
  • a metering system for an enzyme-containing cleaning amplifier which is separate from the cleaning agent metering system and which has an operating state for maintenance metering during interruptions or stationary phases of the dishwasher operation and / or metering breaks Detergent dispensing system and / or an operating state for batch dosing after interruptions or standstill phases of dishwasher operation and / or dosing pauses of the detergent desier system.
  • a low-alkaline detergent in the usual concentration in conjunction with an enzyme-containing detergent enhancer also results in the short contact times of 10 to 180 seconds common in commercial dishwashers excellent removal and inhibition of starch build-up on the dishes.
  • the process according to the invention is distinguished by a considerable improvement in operational and application safety. Operating personnel are no longer endangered by etching injuries caused by highly alkaline cleaners or washing liquors.
  • the enzyme-containing cleaning booster can either be metered into the at least one metering or washing tank of the dishwasher, but can also be metered into the liquid flowing through the rinse line and / or the spray system of the commercial dishwasher and can be fed to the dishwasher in this way.
  • the cleaning booster can contain as an enzyme, amylase, lipase, protease or other, in particular carbohydrate-degrading, enzymes, either individually or in suitable mixtures.
  • the lower-alkaline cleaner may optionally also contain complexing agents other than those listed, if this is desired.
  • a concentration of 0.5 to 15 g / l of lower alkaline cleaner and a concentration of 0.05 to 2 g / l of cleaning booster are set in the washing or washing liquor.
  • a low-alkaline cleaner is metered in at an application concentration with a pH of 7 to 11, preferably 9.1 to 10.8, which is also provided by the invention.
  • a cleaning booster is metered in which contains about 0.01 to 0.6% by weight, preferably 0.45 to 0.55% by weight, of enzyme, in particular amylase, and 10 Contains up to 25 wt .-%, preferably 15 to 20 wt .-%, propylene glycol, in particular propylene glycol-1,2 and a corresponding amount of water, as provided by the invention in one embodiment.
  • the enzyme-containing cleaning booster during regular dishwasher operation with a normal cleaning concentration of 0.5 to 8 g / l in the washing or washing liquor and / or during a periodic basic cleaning with an increased cleaning concentration in the Rinsing or washing liquor of 3 to 15 g / 1 is added to the rinsing or washing liquor in parallel or subsequently to the alkaline detergent.
  • enzymes such as amylase, lipase or protease are not stable in the washing liquor of commercial dishwashers. After being washed into the wash tank of a commercial dishwasher, enzyme-containing cleaning agents or detergent boosters lose their effect relatively quickly. In the event of interruptions or standstill phases in the operation of the dishwasher and / or dosing of the cleaning agent or the cleaning booster, enzyme degradation or enzyme decay (consumption) occurs, in which the enzyme content in the washing or washing liquor frequently amounts to about 40 to 60% drops per hour. Depending on the degree of consumption, z. B. even after a half-hour break in machine operation, the enzyme content has dropped to well over half.
  • the invention provides that the under washing conditions
  • enzyme-containing cleaning agents which are subject to enzyme degradation or enzyme breakdown (consumption) are strengthened in the event of interruptions or downtimes in the dishwasher operation and / or dosing intervals of the cleaning agent by means of the washing or washing liquor in an amount which is supplied to the during the respective interruption or standstill phase and / or dosing pause compensating for enzyme degradation or enzyme decay (consumption), so that after the end of the respective interruption or standstill phase and / or dosing break the machine bed rubbed with essentially the same enzyme concentration in the rinsing or washing liquor as before the respective interruption or standstill phase and / or dosing pause.
  • This ensures that with each active cleaning phase of the Washing cycle in a commercial dishwasher is sufficiently high enzyme concentration in
  • enzyme is already incorporated into the liquid or powdery low-alkaline cleaning agent.
  • a solid enzyme carrier for example a laser carrier, can be incorporated into a powdery, low-alkaline cleaner. This enzyme-containing cleaning agent is then used in combination with the enzyme-containing cleaning agent.
  • the invention provides in an embodiment that during detergent dosing times in the rinsing or washing liquor, an enzyme for immediate rinsing in sufficient quantity, in particular powdery, low-alkaline cleaning agent, is metered in and immediately after completion or during the Interruptions or standstill phases and / or the dosing pauses of the cleaning agent to the extent of the enzyme breakdown or enzyme decay (consumption) the enzyme-containing cleaning booster is added to the rinsing or washing liquor in order to maintain the enzyme concentration.
  • the enzyme-containing cleaning booster is therefore only metered into the washing or washing liquor during or immediately after the dosing pauses of the cleaning agent and / or the interruptions or downtimes of the dishwasher operation.
  • the enzyme-containing cleaning amplifier is not dosed.
  • Cleaning booster is used.
  • the invention provides in an embodiment that an enzyme-free, in particular liquid, non-alkaline cleaning agent is metered into the rinsing or washing liquor during detergent dosing times, and the enzyme-containing cleaning booster is metered in parallel to the extent of the detergent consumption, and immediately after completion or during the interruptions or standstill phases and / or the dosing pauses of the detergent to the extent of the enzyme breakdown or enzyme decay (consumption), the enzyme-containing cleaning enhancer is added to the washing or washing liquor to maintain the enzyme concentration.
  • the combination of enzyme-containing ones mentioned above. Detergent with enzyme.
  • Cleaning booster in the case of the combination of enzyme-free cleaning agent with enzyme-containing. Cleaning boosters are also metered into the at least one metering or washing tank of the commercial dishwasher during the metering or metering times of cleaning agents in parallel to the cleaning agent containing enzyme-containing cleaning boosters.
  • the invention provides two alternatives for the metering-in or metering-in of the enzyme-containing cleaning booster.
  • the enzyme-containing cleaning booster can be metered in or out during the interruptions or standstill phases of the dishwasher operation and / or dosing pauses of the cleaning agent, and the metering or re-metering of the enzyme-containing cleaning booster can take place immediately after the interruptions or downtimes have ended the dishwasher operation and / or the dosing pauses of the cleaning agent.
  • the invention provides in a further embodiment that the enzyme concentration in the rinsing or washing liquor is maintained during the respective interruption or standstill phase and / or during the dosing pauses of the cleaning agent by maintenance dosing of the enzyme-containing cleaning amplifier. It is advantageous here if the maintenance dosing takes place in individual dosing strokes, as the invention provides in a further development.
  • the embodiment accordingly aims primarily at a maintenance dosage of the enzyme-containing cleaning amplifier in the downtimes of the dishwasher between two successive washing phases or during the dosing pauses between two dosing times of the cleaning agent.
  • the maintenance dosing ensures that, to the extent of the enzyme breakdown or enzyme decay (consumption), new, enzyme-containing cleaning boosters in the at least one dosing or wash tank.
  • the wash tank or the washing liquor of the dishwasher is thus constantly ready for a new washing phase.
  • the enzyme-containing cleaning booster is replenished into the at least one wash tank only during the standstill phases or dosing intervals of the detergent to the extent of the enzyme breakdown.
  • an enzyme-free cleaning agent in particular a liquid cleaner, is used, in addition to the maintenance dosing during the dosing times for the cleaning agent, the enzyme-containing cleaning amplifier is dosed in parallel.
  • the enzyme-free cleaning agent the enzyme is metered into the wash tank or the rinsing or washing liquor during the rinsing phases of the detergent consumption and during the standstill phases or the detergent dosing breaks to the extent of the enzyme breakdown or enzyme breakdown.
  • the parallel dosing enables the use of enzyme-containing. Cleaning amplifier such. B. amylase solution, which cannot be formulated with the usual enzyme-free alkaline, in particular lower alkaline, cleaning agents.
  • B. amylase solution which cannot be formulated with the usual enzyme-free alkaline, in particular lower alkaline, cleaning agents.
  • liquid or powder detergents are metered in depending on the measured conductivity or the measured pH value or time-controlled only during certain metering times. If the corresponding intermediate times or detergent dosing breaks become so long that an amount of enzyme which has an adverse effect on the cleaning performance of the next rinsing phase has broken down, it is within the scope of the invention also in the intermediate or control pauses occurring during the rinsing phase Parallel dosing to the extent of the enzyme disintegration in accordance with enzyme-containing cleaning enhancers, also as maintenance dosing.
  • the enzyme delivery rate of the maintenance dosing is optimized on the basis of an enzyme activity determination, as is further provided by the invention. After knowing the rate of decay of the enzymes, it may be sufficient to add detergent enhancers at certain intervals.
  • the invention further provides that, after each disintegration of about 20% of the original enzyme content in the rinsing or washing liquor, maintenance dosing of the enzyme-containing cleaning amplifier is started.
  • the other of the two alternatives explained above, according to one embodiment of the invention, consists in the fact that immediately after the interruption or standstill phase and / or dosing pause has ended, a surge dosing takes place in which a quantity of enzyme-containing substances is present.
  • Cleaning intensifier is supplied in the rinsing or washing liquor, which corresponds to the enzyme breakdown or enzyme breakdown (consumption) that took place during the duration of the respective interruption or standstill phase and / or dosing pause.
  • the enzyme-containing cleaning booster is dosed, the amount of enzyme-containing cleaning booster supplied during the dosing being adapted to the duration of the interruption and is dimensioned such that it compensates for the enzyme breakdown or enzyme breakdown (consumption) which occurred during the interruption. Accordingly, during the interruption or standstill phase of the machine operation and / or the detergent dosing pause, no enzyme-containing cleaning booster is fed to the at least one dosing or wash tank or the washing or washing liquor of the dishwasher.
  • the supply of enzyme-containing cleaning enhancers takes place only after the interruption or dosing pause has ended within a relatively short time, so that the amount of enzyme which was consumed during the respective interruption or dosing pause is replaced.
  • the measurement of the amount of the cleaning booster added during the batch dosing takes place as a function of the duration of the interruption and / or dosing pause and as a function of the course of the enzyme breakdown which can be described by a mathematical function, for example an e-function. This ensures that the enzyme consumed is replaced fairly accurately without substantial underdosing or overdosing.
  • the time course of the enzyme consumption essentially follows an exponential function, the concentration decreasing exponentially starting from an initial concentration.
  • a practice-oriented pulse dosage after a pause t must consequently follow the complementary function of the course of the enzyme consumption.
  • the enzyme-containing cleaning booster In the case of surge dosing as well as maintenance dosing, it is possible for the enzyme-containing cleaning booster to be metered in during the dosing times in parallel, if an enzyme-free cleaning agent is used.
  • the device according to the invention for carrying out the method according to the invention is basically characterized by a metering system for the enzyme-containing cleaning amplifier which is separate from the cleaning agent metering system, the latter having an operating state for maintenance metering and / or an operating state for shock metering.
  • the detergent dosing system can be designed in the usual way, e.g. B. as a metering pump in a liquid cleaner or as fresh water or liquor in a powder cleaner.
  • the dosing system for the enzyme-containing cleaning enhancer which is separate or separate from the detergent dosing system. This has either an operating state for maintenance dosing or an operating state for surge dosing and is provided with the technical equipment necessary for the respective operating state.
  • the cleaning amplifier metering system has either only technical devices for the operating state of maintenance metering or technical devices for the operating state of shock metering
  • the device thus enables maintenance dosing during the interruptions or standstill phases of the dishwasher operation and / or the cleaning agent dosing breaks, or a shock dosing immediately after the end of interruptions or standstill phases of the dishwasher operation and / or cleaning agent dosing breaks, so that a Enzyme degradation or decomposition-induced consumption of the enzyme activity is compensated for during this time.
  • the device in a further development of the invention contains a counter, to which pause pulses are regularly fed during the interruption times. With these pause pulses, the counter reading is not increased linearly, but rather according to a step-wise approximated function which is complementary to the enzyme decay, in particular an e-function, in order finally to asymptotically approach a predetermined final value with a minimal count rate.
  • the counter is counted linearly downwards from the counter state reached at a constant clock rate until the counter state reaches zero.
  • the downward counting pulses activate a pump which effects the shock metering.
  • the duration of the surge metering therefore depends on the counter reading reached during the interruption time.
  • the duration of the shock metering is orders of magnitude shorter than the duration of the interruption times that are considered.
  • the surge metering thus compensates for the drug consumption of several tens of minutes to hours within a period of seconds to minutes.
  • the level of the meter reading is therefore a measure of the duration of the surge metering.
  • This duration is in any case much shorter than the duration of possible break times, so that the shock dosage of the enzyme-containing cleaning boosters occur at a much higher rate than the breakdown or decay (consumption) of the enzyme in the wash liquor.
  • the enzyme consumption of several 10 minutes is compensated in this way.
  • This type of shock metering occurs not only immediately after interruptions or downtimes in the dishwasher operation, but also, if desired, immediately after cleaning agent dosing breaks.
  • the term "counter” is to be understood broadly in this context. It includes any counting device that counts the supplied pause pulses according to a given function and is therefore also not linear, e.g. B. an e-function enables "counting processes".
  • the variation of the time interval of the pause pulses can be used for acceleration (compression) or deceleration (expansion) of the counting process in the time domain.
  • the pause pulses can be present at a constant time interval and can be multiplied by a factor whose time profile corresponds to an e-function.
  • the counter can also contain a summing device which, with each pause pulse, contains the counter reading increased by a time-varying amount.
  • the invention provides for devices with the operating state of maintenance dosing as well as for devices with the operating state of shock dosing that the dosing system for the enzyme-containing cleaning booster additionally provides an operating state which promotes parallel to the detergent dosing system for parallel dosing when the cleaning agent dosing system is switched on ⁇ sits.
  • both enzyme-containing and enzyme-free cleaning agents can be used with the device, with the parallel metering being an addition of enzyme-containing ones. Cleaning amplifier made possible when using enzyme-free cleaning agent.
  • the parallel dosing and the maintenance dosing or the surge dosing differ essentially only in that per unit of time in each case in the dosing tank or the rinsing or washing liquor conveyed amount of enzyme-containing cleaning enhancer.
  • a frequency-controlled peristaltic pump or a diaphragm pump is provided for conveying the enzyme-containing cleaning amplifier, as the invention further provides.
  • Such a pump can be operated with a number of pump strokes per unit of time corresponding to the enzyme breakdown. Relatively few pump strokes are then sufficient for maintenance dosing, while a much larger number of pump strokes are required for surge dosing and / or possibly parallel dosing when using an enzyme-free cleaner.
  • the associated frequency control of the pump has a first control range for maintenance dosing and a second control range for the dishwashing phase of the dishwasher when the detergent dosing system is switched on, with a significantly increased delivery rate compared to the dose in the first control range.
  • Fig. 1 is a block diagram of detergent dosing system
  • Cleaning amplifier dosing system for liquid, enzyme-free cleaning agent and for liquid, enzyme-containing cleaning amplifier for liquid, enzyme-free cleaning agent and for liquid, enzyme-containing cleaning amplifier
  • Fig. 2 is a functional diagram for a parallel and maintenance dosing of enzyme-containing. Cleaning amplifier when using enzyme-free cleaning agent,
  • FIG. 3 shows a block diagram of detergent dosing system and cleaning amplifier dosing system for enzyme-containing powder detergent and liquid, enzyme-containing cleaning amplifier.
  • FIG. 5 shows a schematic block diagram of a device for shock metering
  • FIG. 6 shows a diagram to illustrate the theoretical dosing function and the function approximated by a counting algorithm of the counter in the case of surge dosing and in
  • FIG. 1 shows the detergent dosing system for liquid, enzyme-free, low-alkaline cleaner 2 assigned to a commercial dishwasher, as explained below in connection with FIG. 5, for example, and the cleaning amplifier dosing system for liquid, enzyme-containing detergent booster assigned to the commercial dishwasher 5.
  • a customary liquid detergent metering pump 1 delivers liquid, enzyme-free detergent 2 from a liquid detergent tank, for example regulated by a conductivity or pH value measurement, through a line 3 to at least one (not shown) metering or washing tank of a dishwasher .
  • Parallel to the liquid cleaner metering pump 1 is a frequency-controlled squeeze pump
  • This dosing system for liquid-made, enzyme-containing cleaning boosters 5 can be controlled by means of internal and / or external electronics in such a way that a function diagram according to FIG. 2 is established, i.e. maintenance dosing 17, 18 and, if necessary, parallel dosing 16 of cleaning booster 5 in addition to the dosing of cleaning agents is possible.
  • the second line shows the dosage of the enzyme-free cleaning agent 2, ie the active operating state of the liquid cleaner metering pump 1.
  • a double start of the metering pump 1 is assumed during a machine switch-on state 10.
  • the corresponding two detergent dosing times are designated 12 and 13.
  • An intermediate dosing pause is indicated by 14 and the dosing pause corresponding to the interruption or the standstill phase 11 of the dishwasher operation is identified by 15.
  • the third line, designated by 9, shows the dosage of the enzyme-containing cleaning amplifier 5, ie the active operating state of the peristaltic pump 4.
  • the cleaning amplifier 5 is dosed in parallel with a rapid sequence of individual pump strokes of the peristaltic pump 4.
  • Each individual pump stroke is in line 9 of FIG. 2 - and also in line 9a of FIG. 4 - shown as a single vertical line.
  • the work of the peristaltic pump 4 is very slowed down during the dosing breaks 14, 15 of the dishwasher;
  • the corresponding maintenance doses 17, 18 there are significantly fewer pump strokes per unit time than during the parallel dosing 16 in the rinsing phases 10 or the detergent dosing times 12, 13.
  • the liquid cleaning agent 2 can be seen during the interruption or standstill phase 11 does not add more to the dishwasher (detergent dosing pause 15). Such additional metering is not necessary since the concentration of cleaning agent in the wash liquor is then not significantly reduced. Only the enzyme breakdown or enzyme decay (consumption) during the standstill phase 11 is compensated for by the slowed down metering or maintenance metering 17 during this period. It can be cheap for longer Dosing pauses 14 in the washing phases 10 of the dishwasher provide individual pump strokes of a maintenance dosage 18 in order to compensate for the enzyme breakdown or decay (consumption) which also takes place continuously during this time.
  • a parallel dosage of enzyme-containing cleaning boosters 5 generally does not have to be provided, rather a maintenance dosage 17 is sufficient.
  • FIG. 3 the detergent dosing system associated with a commercial dishwasher for an enzyme-containing, lower-alkaline powder cleaner 19 and the separate dosing system for the enzyme-containing liquid cleaning booster 5 and FIG. 4 in the three Lines 7a, 8a and 9a show the different switch-on and switch-off states (1/0) of the commercial dishwasher and the metering systems as a function of the time t.
  • 3 consists of a funnel 20 with an enzyme-containing, low-alkaline powder cleaner 19 filled therein.
  • the enzyme-containing powder cleaner 19 is metered into the funnel 20 via a fresh water or liquor flush 21 and a line 22 to at least one metering or washing tank of a commercial dishwasher (arrow direction).
  • a metering system for enzyme-containing cleaning booster 5 with a frequency-controlled squeeze pump 4 is provided according to FIG. 3, which also conveys the enzyme-containing cleaning booster 5 from a tank via a line 6 to the at least one metering or washing tank of the dishwasher.
  • the peristaltic pump 4 according to FIG. 3/4 only works during the standstill phase 11 of the dishwasher and possibly during the dosing break 14, as indicated in line 9a of FIG. 4 is.
  • Lines 7a and 8a show identical operating states as lines 7 and 8 according to the embodiment of FIG. 1/2. 3 and 4 in the dosage 12, 13 of enzyme-containing.
  • Cleaner 19 while enzyme is already being metered into the at least one metering or wash tank during the rinsing phases 10, is not required for this Embodiment a parallel dosing of enzyme-containing cleaning boosters during the dosing times 12 and 13. Only during the interruption or standstill phase 11 or the cleaning agent dosing pause 15 is the enzyme-containing cleaning booster 5 dosed in the form of a maintenance dosage 17. In addition, under certain circumstances it can be favorable to provide one or more dosing strokes as maintenance dosing 18 in dosing breaks 14 between two cleaning agent doses 12 and 13, similar to the embodiment according to FIG. 2, which is also shown in line 9a of FIG. 4.
  • a modification of a frequency-controlled peristaltic pump 4, 27 is preferably used to operate the maintenance metering 17, 18 and the shock metering SD explained below and the desired parallel metering 16, the pump used in the maintenance metering being shown in FIGS. 1 and 3 the reference number 4 and the pump used in the surge metering in FIG. 5 is provided with the reference number 27.
  • Two control ranges of the frequency control are possible, firstly an area I for parallel metering 16 or the shock metering SD explained below with a delivery rate range of 8 to 290 ml / min and secondly an area II for maintenance dosages 17, 18 with a delivery rate range of 1, 5 to 3.5 ml / min. These two control ranges can be selected externally so that readjustment is possible according to the washing result. It is of course also possible to provide a separate pump for each type of metering for the desired delivery range or, in the case of surge metering and parallel metering, a pump with only one control range for both metering types.
  • the addition or subsequent dosing of enzyme-containing cleaning enhancers 5 can be carried out also done by a shock metering SD.
  • the shock dosing SD is immediately after a Interruption or standstill phase 11 and / or a detergent dosing break 14, 15 activated.
  • the corresponding function diagrams for a surge dose SD in lines 7, 7a and 8, 8a would not differ from the function diagrams shown in FIGS.
  • the dishwasher 23 contains several tanks one behind the other, from which washing or washing liquor is sprayed against the dishes in order to then run back into the tanks.
  • the tanks are arranged in a cascade-like manner in a known manner, the washing or washing liquor passing through the tanks successively from the outlet end (right) to the inlet end (left), so that the degree of soiling of the washing liquor increases from the outlet end to the inlet end.
  • water is introduced into the dishwasher 23 and additionally from a detergent tank 24 lower-alkaline cleaning agent 2, which is contained in the detergent tank 24 in liquid form.
  • the cleaning agent 2 is conveyed by a pump 25 in metered form.
  • This pump 25 is driven by a pump control unit 26.
  • the detergent 2 is dosed as a function of the conductivity or pH of the washing liquor contained in the dishwasher 23.
  • the pump control unit 26 controls a further pump 27, which doses a liquid, enzyme-containing cleaning amplifier 5 into the dishwasher 23 from a tank 28.
  • the cleaning booster contains enzymes such as amylase, lipase or protease.
  • the cleaning amplifier 5, which is contained in liquid form in the tank 28, is introduced into the dishwasher 23 by the pump 27, which is preferably a peristaltic pump.
  • the pump 27 is controlled by pulses that it are supplied via a control line 29.
  • the pump is driven by a stepper motor, each pulse in the control line 29 corresponding to a specific delivery rate of the pump 27.
  • the control line 29 is connected to an operating pulse line 30 coming from the pump control unit 26.
  • the operating pulse line 30 supplies operating pulses 10 of the dishwasher 23 during the operating state 10, the frequency of which is dimensioned such that the pump 27 in the wash liquor maintains a certain concentration of enzyme-containing cleaning amplifier 5, that is to say a parallel metering 16 is carried out.
  • the pump control unit 26 does not deliver any pulses to the pump 25 for the cleaning agent 2 and likewise does not deliver any operating pulses to the operating pulse line 30 analogous to the example shown in FIG. 2 of a shock metering (explained below) in combination with a parallel metering 16.
  • a counter 32 is connected to a pause pulse line 31 of the pump control unit 26.
  • the pause pulse line 31 delivers pulses to the counter 32 at a constant time interval when the dishwasher is interrupted or during a standstill phase 11 and / or during dosing pauses 15 and possibly dosing pauses 14.
  • the counter 32 counts non-linearly in the manner shown in FIG. 6.
  • 6 shows the pause time t along the abscissa during an interruption or standstill phase 11 and / or a dosing pause 14, 15 and along the ordinate the counter reading n.
  • a pause pulse is delivered every minute. With each pause pulse, the counter reading of the counter 32 is increased by a varying counting step. The size of the counting steps decreases with increasing pause time t. The counting capacity of the counter 32 is 128 here.
  • the time course of the counter reading corresponds to a staircase curve 33 which is approximated to an e-function 34.
  • C is the enzyme concentration at time t
  • CQ is the initial concentration of the enzyme
  • ⁇ 1 "
  • the enzyme-containing cleaning amplifier 5 is metered in after a pause t after the function which is complementary to the consumption function
  • Vt is the shock metering time for a pause time of t and V max the maximum shock metering time.
  • This function V corresponds to the ideal curve 34 of FIG. 6, which is approximated by the stair curve 33.
  • the stair curve 33 is implemented in the counter 32 by means of a programmable logic module (PLD).
  • PLD programmable logic module
  • the non-linear counting function is achieved by varying the counting step.
  • the clock rate d-sr pause pulses is adapted to the consumption function of the enzyme or the enzyme-containing cleaning amplifier 5.
  • the maximum counter reading n max de is 128, which corresponds to a resolution of 7 bits.
  • the counter reading of the counter 32 is counted linearly in steps from 1 downwards to 0. 35 pulses are generated at the counter output, which are supplied to the pump 27 via the control line 29. The pulses generated when counting down the counter 32 at the output 35 cause the surge metering by the pump 27. When the counter reading 0 is reached, the surge metering is ended.
  • FIG. 7 shows the course over time of the enzyme concentration C in the wash liquor in the event of an interruption or standstill phase 11 in the dishwasher operation or a dosing break 14, 15, the length of which is t ⁇ .
  • the enzyme concentration C / CQ normalized to the normal value Co is given along the ordinate. After the start of the break, the enzyme concentration drops exponentially from the value 1.
  • the break in operation the duration of which is tj, ends at the start of the shock metering duration t2.
  • the operation of the dishwasher ie the active operating state 10 or the dosing times 12, 13, begins anew at the end of the period tj or the beginning of the period t2, with a shock metering SD being carried out in the initial phase.
  • the duration t2 of the shock metering SD is, for example, 1 to 2 minutes and is considerably shorter than the break tj.
  • the counter 32 counts up step by step as a result of the pause pulses, the counter reading n developing in accordance with the curve 33 in FIG. 6 and approaching asymptotically to the maximum counter reading n max which is finally reached when the dishwasher is paused for operation is not interrupted beforehand.
  • the maximum meter reading n max corresponds to the maximum shock metering time.
  • the maximum counter reading is reached when the pause time is approximately 5 T, where V is the consumption time constant of the enzyme.
  • the clock rate of the counter 32 when counting down is selected such that the So11 concentration Co of enzyme in the wash liquor is just reached again at the maximum surge metering time.
  • the clock rate R in 1 / s is
  • V max is the maximum shock dosing time
  • the maximum count is reached after a pause of 0.5 to 3 hours.
  • a low-alkaline cleaner based on phosphate or nitrilotriacetic acid or its salts are used as cleaning agents in the devices described. and metered an amylase-containing cleaning booster 5 into the dishwasher.
  • the cleaning enhancer can also contain lipase or protease.
  • a cleaning booster based on Thermamyl 300 L (N0V0), consisting of 0.55% by weight amylase, 18.0% by weight propylene glycol - 1.2, 72% by weight water, 9 is preferably used , 45 wt .-% residual water and salts used.
  • Cleaners 2, 19 and / or cleaning boosters 5 can be metered into at least one washing or dosing tank of the dishwasher and / or the rinse line and / or the spraying device of the dishwasher.
  • the enzyme-containing cleaning booster is used during regular dishwasher operation with the usual cleaning concentration in the washing or washing liquor of 0.5 to 8 g / 1 and / or a periodic basic cleaning with an increased concentration of 3 to 15 g / 1 in the rinsing or washing liquor only metered in parallel or subsequently to the lower alkaline detergent of the rinsing or washing liquor.
  • the usual cleaning concentration in the washing or washing liquor of 0.5 to 8 g / 1 and / or a periodic basic cleaning with an increased concentration of 3 to 15 g / 1 in the rinsing or washing liquor only metered in parallel or subsequently to the lower alkaline detergent of the rinsing or washing liquor.
  • these can be two metering pumps that can be operated parallel to one another.

Landscapes

  • Detergent Compositions (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cleaning In General (AREA)

Abstract

Selon un procédé de lavage de la vaisselle dans des lave-vaisselle industriels (23), des doses de détergent (2, 19) et d'une autre substance active qui renforce l'effet du détergent sont ajoutées au bain de rinçage ou de lavage du lave-vaisselle (23). Afin d'éviter de manière durable la formation d'un dépôt d'amidon sur la vaisselle pendant le lavage dans des lave-vaisselle industriels, on ajoute comme détergent (2, 19) au bain de lavage des doses d'un détergent à faible alcalinité, notamment à base de phosphate ou de NTA, et, comme adjuvant, un renforçateur (5) du lavage contenant une enzyme, de préférence une enzyme décomposant les glucides, notamment l'amylase. Il est en outre possible de compenser la décomposition ou la dégradation de l'enzyme pendant des phases d'arrêt (11) du fonctionnement du lave-vaisselle en ajoutant des doses d'entretien (17, 18) ou des doses intermittentes (SD) avant le début d'une nouvelle phase active de rinçage.
EP94918791A 1993-05-25 1994-05-25 Procede et dispositif de lavage de la vaisselle en machine Expired - Lifetime EP0700265B2 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE4317295 1993-05-25
DE4317295 1993-05-25
DE4324106A DE4324106C1 (de) 1993-05-25 1993-07-17 Verfahren und Vorrichtung zur Zudosierung von Wirkstoffen zu einer Spülmaschine
DE4324106 1993-07-17
DE4324202A DE4324202C2 (de) 1993-05-25 1993-07-19 Verfahren und Vorrichtung zur maschinellen Geschirreinigung
DE4324202 1993-07-19
PCT/EP1994/001698 WO1994027488A1 (fr) 1993-05-25 1994-05-25 Procede et dispositif de lavage de la vaisselle en machine

Publications (3)

Publication Number Publication Date
EP0700265A1 true EP0700265A1 (fr) 1996-03-13
EP0700265B1 EP0700265B1 (fr) 1997-07-30
EP0700265B2 EP0700265B2 (fr) 2005-01-05

Family

ID=27205119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94918791A Expired - Lifetime EP0700265B2 (fr) 1993-05-25 1994-05-25 Procede et dispositif de lavage de la vaisselle en machine

Country Status (12)

Country Link
US (1) US6718991B1 (fr)
EP (1) EP0700265B2 (fr)
JP (1) JP3342702B2 (fr)
AT (1) ATE155987T1 (fr)
CA (1) CA2163757C (fr)
DK (1) DK0700265T3 (fr)
ES (1) ES2105725T3 (fr)
FI (1) FI105071B (fr)
GR (1) GR3024425T3 (fr)
NO (1) NO311123B1 (fr)
TR (1) TR28788A (fr)
WO (1) WO1994027488A1 (fr)

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JP2009019130A (ja) * 2007-07-12 2009-01-29 Adeka Corp 洗浄剤組成物及びそれを使用した食器類の洗浄方法
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US9023784B2 (en) 2012-09-13 2015-05-05 Ecolab Usa Inc. Method of reducing soil redeposition on a hard surface using phosphinosuccinic acid adducts
MX2016005852A (es) 2013-11-11 2016-07-13 Ecolab Usa Inc Detergente de lavado de utensilios altamente alcalino con control de incrustaciones y dispersion de suciedad mejorados.
CN105705625A (zh) 2013-11-11 2016-06-22 艺康美国股份有限公司 多用途的酶洗涤剂和稳定使用溶液的方法
US10508374B2 (en) * 2014-06-24 2019-12-17 Electrolux Appliances Aktiebolag Method for operating a laundry washing appliance and laundry washing appliance implementing the same
US10851331B2 (en) 2017-04-27 2020-12-01 Ecolab Usa Inc. Solid controlled release carbonate detergent compositions
JP7091454B2 (ja) 2017-11-14 2022-06-27 エコラボ ユーエスエー インコーポレイティド 固形制御放出苛性洗剤組成物
EP4007803A1 (fr) 2019-09-27 2022-06-08 Ecolab USA Inc. Détergent et produit de rinçage concentré 2-en-1 pour lave-vaisselle

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Also Published As

Publication number Publication date
JPH08510397A (ja) 1996-11-05
GR3024425T3 (en) 1997-11-28
JP3342702B2 (ja) 2002-11-11
CA2163757C (fr) 2004-09-07
ES2105725T3 (es) 1997-10-16
DK0700265T3 (da) 1998-03-16
TR28788A (tr) 1997-03-25
FI105071B (fi) 2000-06-15
NO954592L (no) 1995-11-14
FI955612A (fi) 1995-11-22
NO954592D0 (no) 1995-11-14
NO311123B1 (no) 2001-10-15
EP0700265B2 (fr) 2005-01-05
WO1994027488A1 (fr) 1994-12-08
ATE155987T1 (de) 1997-08-15
CA2163757A1 (fr) 1994-12-08
EP0700265B1 (fr) 1997-07-30
FI955612A0 (fi) 1995-11-22
US6718991B1 (en) 2004-04-13

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