EP3896143B1 - Procédé de traitement par voie humide du linge - Google Patents

Procédé de traitement par voie humide du linge Download PDF

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Publication number
EP3896143B1
EP3896143B1 EP21168405.5A EP21168405A EP3896143B1 EP 3896143 B1 EP3896143 B1 EP 3896143B1 EP 21168405 A EP21168405 A EP 21168405A EP 3896143 B1 EP3896143 B1 EP 3896143B1
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EP
European Patent Office
Prior art keywords
disinfectant
treatment liquid
concentration
disinfection
laundry
Prior art date
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Active
Application number
EP21168405.5A
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German (de)
English (en)
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EP3896143A1 (fr
Inventor
Engelbert Heinz
Wilhelm Bringewatt
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Herbert Kannegiesser GmbH and Co
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Herbert Kannegiesser GmbH and Co
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Publication of EP3896143A1 publication Critical patent/EP3896143A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/48—Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/37—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of metering of detergents or additives
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/22—Condition of the washing liquid, e.g. turbidity
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/12—Soft surfaces, e.g. textile
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • D06F2103/22—Content of detergent or additives
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/68—Operation mode; Program phase
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/42—Detergent or additive supply
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • 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
    • D06F31/00—Washing installations comprising an assembly of several washing machines or washing units, e.g. continuous flow assemblies
    • D06F31/005—Washing installations comprising an assembly of several washing machines or washing units, e.g. continuous flow assemblies consisting of one or more rotating drums through which the laundry passes in a continuous flow

Definitions

  • the invention relates to a method for the wet treatment of laundry according to the preamble of claim 1.
  • the wet treatment of laundry is usually carried out by washing, rinsing and, if appropriate, at least one aftertreatment, which can involve, for example, finishing the washed and rinsed laundry.
  • Contaminated laundry in particular must also be disinfected.
  • a method for the wet treatment of laundry which provides for measuring the current content of at least one treatment additive, which can also be a disinfectant, during the wet treatment. Based on the consumption of the at least one treatment additive up to the time of the measurement, the amount of the treatment additive that may still have to be metered in is determined.
  • the DE 39 16 910 A1 and the DE 44 12 576 A1 disclose various measurement or sensor systems for dosing disinfectants. The content of a specific, not yet used disinfectant in the treatment liquid is determined.
  • the invention is based on the object of creating a method for the wet treatment of laundry which allows reliable disinfection without, or at least without a significant overdosing of disinfectants.
  • a method serving to solve this problem has the measures of claim 1 .
  • the wash preferably main wash, is continued for a predetermined post-disinfection period.
  • the disinfection then takes place with a low concentration of disinfectant in the treatment liquid, preferably Main wash liquid, longer than intended. Due to the extended disinfection phase when the disinfectant concentration is too low, the entire disinfection is nevertheless carried out completely in this way.
  • the disinfectant is added to the treatment liquid, so that the disinfection takes place during the wet treatment, in particular during washing, of the laundry. Then the concentration of the disinfectant in the treatment liquid is measured after or before and after the disinfection.
  • concentration of the disinfectant in the treatment liquid which is used in particular for washing, meaningful measurement results are obtained which allow a reliable assessment of whether the concentration of the disinfectant in the treatment liquid is sufficient for complete disinfection of the laundry and/or whether there is still a minimal residual concentration after the disinfection of disinfectant is present in the treatment liquid, which indicates reliable disinfection.
  • An advantageous further development of the method provides that the laundry is washed in a prewash and a subsequent main wash and the laundry is disinfected during the main wash. It is then particularly advantageous to determine the concentration of the at least one disinfectant in the treatment liquid, in particular the main wash liquid, after and/or before the main wash. If the concentration of the disinfectant is only determined after the main wash, the measured residual concentration of the disinfectant is used to determine whether the disinfection was able to take place sufficiently, namely when the measured residual concentration after the main wash corresponds to or exceeds a predetermined limit value. If, in addition, the concentration of the disinfectant in the treatment liquid is measured before the main wash, then, if necessary, disinfectant can be replenished before the start of the disinfection of the laundry during the main wash process. This subsequent dosing takes place when the concentration of the disinfectant in the main wash liquid measured before the main wash is below a predetermined limit value.
  • the disinfectant is then added after the laundry has been separated, at least for the most part, from the free prewash liquid and the main wash liquid used for the main wash.
  • the concentration of the disinfectant in the treatment liquid, in particular the main wash liquid is measured with at least one sensor.
  • the concentration of at least one sensor is preferably measured according to the flow-through principle.
  • the sensor is one that is designed to measure the disinfectant in question.
  • the measurement of the concentration of the disinfectant in the treatment liquid takes place at a specified temperature.
  • a specified temperature is the temperature that the main wash liquid with the disinfectant added to it should have at least at the beginning of the main wash.
  • This temperature is preferably a constant 35°C or optionally up to 5°C above or below. Because the measurement result of the sensors for determining the concentration of the disinfectant is highly dependent on the temperature, the measurement at a predetermined, preferably constant, temperature results in measurement results that are comparable to predetermined values.
  • a small amount sufficient to measure the concentration of the disinfectant in the treatment liquid is taken as a sample and used for measurement with the sensors.
  • the treatment liquid containing the disinfectant is diverted from the wash liquor, in particular the main wash liquor.
  • the measurement and thus control of the quantity, in particular the concentration, of the disinfectant in the treatment liquid can be carried out quasi “in situ”.
  • the sample diverted from the treatment liquid with the disinfectant contained therein is first filtered before it is fed to the at least one sensor or guided along it.
  • a single filtration can be sufficient, which is then a fine or superfine filtration.
  • a pre-filtration for example lint separation, preferably takes place first, followed by a finer filtration.
  • the Fine filtration can be fine filtration, ultrafine filtration and/or microfiltration.
  • Another alternative or additional embodiment of the method provides, before the start of post-disinfection of the treatment liquid, to add an amount of disinfectant that corresponds to the minimum concentration of disinfectant in the treatment liquid, preferably at the end of the wash, in particular the main wash, or is higher by a certain percentage. This contributes to an adequate disinfection of the laundry under all circumstances, even if no more disinfectant was measured in the treatment liquid after the end of the initial disinfection.
  • the pH value of the treatment liquid with the disinfectant still present in it can be measured at least after the wash, preferably after the final wash.
  • the sample is also used for this measurement, with which at least one sensor determines the concentration of the disinfectant in the treatment liquid.
  • the measurement of the pH value of the treatment liquid with the disinfectant contained therein preferably takes place after the measurement of the concentration of the disinfectant with at least one corresponding sensor in the sample. This procedure is based on the finding that the measured value obtained when measuring the concentration of the disinfectant in the treatment liquid is dependent on the pH value of the treatment liquid containing the disinfectant.
  • the measured value for the concentration of the disinfectant can be calibrated so that measured values that are comparable with target values can be obtained. This ensures a high level of accuracy, reliability and significance of the data before and/or after the washing process, in particular the main wash process, measured concentration of at least the disinfectant in the treatment liquid.
  • the following description relates to the disinfection of laundry during the wet treatment thereof in a tunnel washing machine 10 for commercial laundries.
  • the laundry to be treated wet namely to be washed and disinfected, is not shown in the figures.
  • the laundry can be textiles of all kinds that need to be disinfected, in particular items of clothing, work clothing, flat linen, but also dust control mats or the like.
  • the continuous washing machine 10 shown schematically in a side view has a drum 12 that can be driven to rotate or pivot (back and forth) about a preferably horizontal axis of rotation 11.
  • the axis of rotation 11 runs centrally through the drum 12, preferably horizontally.
  • the laundry is transported batch by batch in the direction of passage 13 through the cylindrical drum 12 which is driven in a rotating or pivoting manner.
  • a plurality of chambers 15 which follow one another in the direction of passage 13 are formed by transverse, circular or annular partitions 14 .
  • the chambers 15 can be of the same size, but they can also be of different sizes.
  • the tunnel washing machine 10 shown has a total of thirteen consecutive chambers 15. However, the method according to the invention is not limited to this. It can also be carried out with tunnel washing machines 10 which have a larger or smaller number of successive chambers 15 .
  • the continuous washing machine 10 shown has three treatment zones that follow one another in the direction of flow 13 . Each treatment zone extends over several successive chambers 15, wherein the number of successive chambers 15 per treatment zone can be different or the same size.
  • the treatment zones are a prewash zone 16, a final wash zone 17 that follows in the flow direction 13, and a rinsing zone 18 behind the final wash zone 17.
  • An after-treatment zone for example a finishing zone and/or neutralization zone, can be integrated into the rinsing zone 18 .
  • the continuous washing machine 10 follows in the 1 dewatering device not shown, for example a dewatering press or a dewatering centrifuge.
  • the drainage device can also be used for rinsing and, if necessary, after-treatment of the pre-washed, clear-washed and disinfected laundry. Then the tunnel washing machine 10 does not need to have a rinsing zone 18 .
  • the drum 12 of the tunnel washing machine 10 is assigned a plurality of stationary and liquid-impermeable outer drums.
  • a first outer drum 19 viewed in the throughput direction 13 is located at the end of the prewash zone 16 .
  • a second outer drum 20 is arranged at the beginning of the main wash zone 17 .
  • a third outer drum 21 is provided at the end of the main wash zone 17 .
  • a fourth outer drum 22 is located at the beginning of the rinsing zone 18 and a fifth (last) outer drum 23 at the end of the rinsing zone 18. 2 ).
  • the respective outer drum 19 to 23 extends over the full length of a chamber 15. In the areas of such chambers 15 to which no outer drum 19 to 23 are assigned, the outer surface of the drum 12 is liquid-impermeable.
  • a loading chute 24 is located in front of the drum 12, with which the tunnel washing machine 10 is loaded in batches by the dirty and possibly also contaminated laundry entering the first chamber 15 of the prewash zone 16 of the tunnel washing machine 10 via the loading chute 24.
  • a discharge chute 25 is provided at the end of the tunnel washing machine 10 . About the discharge chute 25 leaves the washed, disinfected and optionally rinsed laundry lot by batch the last chamber 15 of the continuous washing machine 10. From the discharge chute 25, the wet-treated laundry items with it still bound liquid, the so-called bound liquor, the dewatering device, not shown, are supplied.
  • a sampling line 26 branches off from the second outer drum 20 at the start of the main wash zone 13 .
  • a second sampling line 27 branches off from the third outer drum 21 at the end of the main wash zone 17 .
  • a shut-off valve 28, 29 In each sampling line 26 and 27 there is a shut-off valve 28, 29.
  • both sampling lines 26 and 27 can be closed or alternately one sampling line 26 or 27 can be temporarily opened.
  • the ends of the sampling lines 26 and 27 located behind the shut-off valves 28 and 29 meet at a collection point 30, from there with a common, in particular single, through-flow line 34 to a pump 31, from there through at least one filter 32 and from the filter 32 to be transported to a flow meter 33 .
  • the 2 shows the flow measuring device 33 in more detail in connection with a cross section through the drum 12 of the tunnel washing machine 10 in the area of the third outer drum 21 behind or at the end of the main wash zone 17.
  • the sample coming from the sampling line 26 when the shut-off valve 28 is open flows to a small enough sample for analysis Amount of treatment liquid with disinfectant in the flow line 34.
  • the sample flows through the filter 32, a subsequent buffer tank 35 and an open shut-off valve 36 to get to the pump 31.
  • the pump 31 conveys the sample containing the disinfectant to be measured through the flow measuring device 33.
  • the flow measuring device 33 has two flow cells 37 and 38 which follow one another at a distance in the flow direction of the sample through the flow line 34 .
  • the flow cells 37, 38 represent a small tank or reservoir for at least part of the treatment liquid used as a sample with the mixed disinfectant contained therein of the sample and during the measurement the remainder of the sample flows through the respective flow cell 37, 38. A continuous measurement of the sample then takes place as it passes through the respective flow cell 37 , 38 .
  • the first flow cell 37 following the pump 31 in the direction of flow of the sample is assigned three measuring value recorders, preferably those which are designed as sensors, namely a conductance sensor 39, a temperature sensor 40 and a pH value sensor. sensor 41
  • At least one sensor for a specific disinfectant is assigned to the second flow cell 38 following the flow cell 37 in the flow direction of the sample. If the disinfectant is peracetic acid, the sensor is designed to measure the concentration of peracetic acid in the sample of treatment liquid and disinfectant. If hydrogen peroxide is used as the disinfectant, the disinfectant sensor 42 is designed to measure hydrogen peroxide. In the case of chlorine as the disinfectant, the disinfectant sensor 42 is a chlorine sensor. Matched disinfectant sensors 42 could also be used for other disinfectants.
  • the disinfectant sensor 42 is designed in such a way that it allows, for example by switching, a measurement of all of these disinfectants with regard to the concentration of the same in the treatment liquid.
  • a pH value sensor 43 and/or temperature sensor 44 is also assigned to the flow cell 38 . But these are only optional, so not absolutely necessary, especially not if the first flow cell 37 already has such sensors. It is conceivable to assign a temperature sensor 40, 44 or a pH value sensor 41, 43 to only the flow cell 37 or the flow cell 38.
  • the conductivity sensor 39, the temperature sensor 40, 44 and/or the pH value sensor 41, 43 can also be provided at least simply at a different point in the tunnel washing machine 10. No temperature sensors 40, 44, pH value sensors 41, 43 and/or conductance sensors 39 are then assigned to the flow cells 37 and 38.
  • a mixer 45 in particular a static mixer, is provided between the flow cells 37, 38. This serves to mix the treatment liquid and the disinfectant in the sample before the sample in the flow cell 38 is measured by the respective disinfectant sensor 42 with regard to the concentration of the at least one disinfectant in the sample.
  • the mixer 45 can also be provided before the first flow cell 37 . It is also conceivable to provide a mixer 45 in front of each flow cell 37 and 38, optionally also different types of mixers.
  • drains are provided behind the second flow cell 38, namely a drain 46 for draining the sample into a sewer and a drain 47 for returning the sample to that chamber 15 of the tunnel washing machine 10 that has the third outer drum 21 behind the main wash zone 17 is assigned.
  • Both drains 46 and 47 are provided with a shut-off valve 48, 49 for selectively shutting off or releasing the respective drain 46, 47.
  • a flow meter 50 can be assigned to the drain 47 returned to the tunnel washing machine 10 . With this, the flow of the sample through the flow cells 37 and 38 and the outflow 47 can be determined. For example, the flow rate of the sample is 5 to 30 liters per hour, especially 10 to 20 liters per hour.
  • an optional fresh water inlet 51 is provided.
  • a pump, in particular a metering pump 52, and a shut-off valve 53 are assigned to this.
  • the sample between the two flow-through cells 37, 38 can be supplied with fresh water in a targeted quantity if required. This can happen, for example, if the temperature sensor 40 of the first flow cell 37 detects that the temperature of the sample is too high, which should preferably be between 30° and 40°, in particular 32° to 38°. Then the high temperature can be reduced to the specified or optimal temperature by supplying an appropriate amount of fresh water when from Temperature sensor 40 of the first flow cell 37 too high a temperature of the sample is detected.
  • the temperature sensor 44 of the downstream flow cell 38 measures the cooled sample resulting from the addition of cold fresh water to determine whether the temperature of the sample after the dosed addition of fresh water is at the temperature intended and/or the optimum temperature for measuring the concentration of the disinfectant in the sample.
  • the one in the 2 The flow measuring device 33 shown measures the concentration of the disinfectant in the sample of treatment liquid and remaining disinfectant after the disinfection is complete, namely at the end of the main wash zone 17, where the third outer drum 21 is located.
  • the flow measuring device 33 shown in connection with the third outer drum 21 behind the main wash zone 17 with its additional components can also be provided in the area of the second outer drum 20 before the main wash zone 17 .
  • the concentration of the disinfectant in the treatment liquid is also (additionally) determined before the main wash, which makes it possible to determine whether the treatment liquid contains enough disinfectant for adequate disinfection of the laundry. If this is not the case, the concentration of at least one disinfectant in the treatment liquid can be increased to the intended target concentration before the main wash by adding at least one disinfectant.
  • both the concentration of the disinfectant before and after the main wash zone 17 is in the 2
  • a sample from the area of the second outer drum 20 in front of the main wash zone 17 can also be supplied.
  • on the optional at least one sample from the second outer drum 20 before the main wash zone 17 or the third outer drum 21 behind the main wash zone 17 to the only one in the 2 shown flow measuring device 33 and its additional components can be supplied by actuating the shut-off valve 28, 29 in the sampling lines 26 or 27 accordingly.
  • the filter 32 is designed in such a way that it has a filter quality that ensures that measurement results can be determined by the sensors in the flow cells 37, 38 that cannot be impaired by components in the sample that are to be filtered out.
  • the filter 32 is preferably a fine filter, in particular an ultra-fine filter with at least one filter membrane.
  • the method according to the invention for disinfecting laundry during wet treatment in connection with the device described above is explained below:
  • the method according to the invention relates to the wet treatment of laundry of any type, the laundry being at least washed and disinfected.
  • the disinfection preferably takes place when the laundry is washed.
  • the laundry is washed and disinfected at the same time.
  • a corresponding amount of at least one disinfectant is added to the treatment liquid of the laundry.
  • the method is designed such that a check is carried out to determine whether the laundry has been disinfected to a sufficient extent, preferably completely, so that the disinfected laundry can be classified as sterile.
  • this check of the completeness of the disinfection is carried out after the washing process, in particular after the main wash. In this way, the completeness of the disinfection is checked "in situ". This makes it possible--if necessary due to the measurement--to extend the disinfection process beyond the intended time period by a certain empirically determined and/or calculated time period.
  • the disinfection takes place in the main wash zone 17 of the tunnel washing machine 10 and the disinfection check, in particular the completeness of the disinfection, takes place at the end of the main wash zone 17 .
  • a small quantity of treatment liquid namely main wash liquid, with the remainder that is ideally still present therein, is discharged Disinfectant taken as a sample.
  • the volume of this sample is only as large as required for the automatic measurement of the residual proportion of disinfectants in the treatment liquid. For example, a few liters of the treatment liquid, namely the main wash liquid, with the residual disinfectant still present in it are sufficient as a sample to be measured.
  • the filtered sample is pumped into the first flow cell 37 by the pump 31 .
  • the temperature and/or the pH value are usually measured by the temperature sensor 40 or pH value sensor 41 in the flow, preferably continuously.
  • the conductance sensor 39 can also measure the conductance of the sample, ie the treatment liquid with the remainder of the disinfectant preferably still contained therein. Because at least the temperature and/or the pH value of the sample can influence the measurement of the concentration of the disinfectant in the treatment liquid, the measured temperature and/or the pH value can be used to compensate and/or correct measured values.
  • the sample leaving the first flow cell 37 is mixed again in the mixer 45 in order to bring about an even distribution of the remaining disinfectant in the treatment liquid, in particular the main wash liquid at the end of the main wash zone 17 .
  • the sample reaches the second flow cell 38 in a homogeneously mixed state.
  • the second flow cell 38 preferably continuously measures at least the concentration of the remaining at least one disinfectant in the treatment liquid or the final wash liquid as the sample flows through. This is done with at least one disinfectant sensor matched to the respective disinfectant. This is about a sensor that measures the residual concentration of the disinfectant, for example peracetic acid, hydrogen peroxide and/or chlorine. Unless one disinfectant sensor 42 is suitable or switchable for measuring different disinfectants, several disinfectant sensors 42 provided for different disinfectants are assigned to the flow cell 38 if different disinfectants are to be measured.
  • a pH value sensor 43 and/or a temperature sensor 44 can also optionally be assigned to the second flow cell 38 . These additional sensors are useful, for example, when cold fresh water is added to the sample before the second flow cell 38 so that the sample has the intended desired temperature and/or the intended pH value for measurement in the second flow cell 38 .
  • the at least one disinfectant sensor 42 determines the concentration of the disinfectant in the treatment liquid at the end of the main wash zone and compares it with the specified minimum residual concentration.
  • the above-described check of the completeness of the disinfection shows that after the disinfection process there is no more disinfectant in the treatment liquid or the residual concentration of the disinfectant is below a specified limit value, this is an indication of incomplete disinfection. If the residual concentration of the disinfectant in the treatment liquid is found to be too low, the disinfection duration can be extended by prolonging the disinfection of the laundry or post-disinfecting with the remaining disinfectant until the laundry is completely disinfected. However, if no more disinfectant is measured in the treatment liquid after the disinfection process, disinfectant must be replenished with the treatment liquid in the main wash zone 17 and then replenished. For this purpose, the laundry is cleaned with the post-dosed disinfectant post-treated until it is completely disinfected - possibly after another measurement of the residual concentration of the disinfectant in the treatment liquid.
  • the method according to the invention also makes it possible, alternatively or additionally, to measure the concentration of the at least one disinfectant in the treatment liquid in the area of a different location on the drum 12 of the tunnel washing machine 10, in particular on at least one other outer drum 19, 20, 22 and/or 23 .
  • the measurement of the concentration of the at least one disinfectant in the as yet unused main wash liquid takes place here in exactly the same way as described in connection with the measurement of the concentration of the remaining disinfectant in the used treatment liquid, in particular main wash liquid.
  • Only the concentration of the at least one disinfectant in the unused treatment liquid is measured before the disinfection in front of the main wash zone 17, namely when all of the disinfectant required and intended for disinfection is still bound in the treatment liquid.
  • the concentration of the at least one disinfectant in the treatment liquid measured upstream of the main wash zone 17 is compared with a target concentration. If the measured concentration is below the target concentration, the at least one disinfectant is added in the missing quantity before the start of the main wash and thus also the disinfection process. The disinfection process can then begin, if necessary after a renewed measurement of the concentration of the at least one disinfectant in the treatment liquid, in particular the main wash liquid.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Claims (8)

  1. Procédé de traitement par voie humide de linge, le linge étant au moins lavé dans un liquide de traitement et le linge étant désinfecté avec un produit désinfectant, et le produit désinfectant étant mesuré avant la désinfection ou après la désinfection, caractérisé en ce que la concentration d'un produit désinfectant déterminé respectif dans le liquide de traitement est mesurée avec au moins un capteur pour le produit désinfectant respectif en prévoyant différents capteurs pour des produits désinfectants différents, en fonction du type de linge, lesquels mesurent de manière ciblée la concentration du produit désinfectant respectivement utilisé dans le liquide de traitement, et le lavage est poursuivi sur une période de post-désinfection dans le cas où la concentration de l'au moins un produit désinfectant dans le liquide de traitement est trop faible après le lavage.
  2. Procédé selon la revendication 1, caractérisé en ce qu'un prélavage dans un liquide de traitement servant à cet effet est effectué, notamment un liquide de prélavage, et le lavage principal dans un autre liquide de traitement servant à cet effet, notamment un liquide de lavage principal, le linge étant désinfecté lors du lavage principal et l'au moins un produit désinfectant étant ici ajouté au liquide de traitement servant au lavage principal.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la concentration de l'au moins un produit désinfectant est mesurée avec au moins un capteur selon le principe du débit, notamment à une température constante spécifiée.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'avant et/ou après la désinfection du linge, une petite quantité, suffisante pour la mesure de la concentration de l'au moins un produit désinfectant dans le liquide de traitement, est détournée en tant qu'échantillon du liquide de traitement présentant le produit désinfectant de la totalité du liquide de traitement servant au lavage, de préférence au lavage principal, avec le produit désinfectant qui s'y trouve encore.
  5. Procédé selon la revendication 4, caractérisé en ce que l'échantillon détourné d'une petite quantité du liquide de traitement présentant le produit désinfectant est tout d'abord filtré au moins une fois avant qu'il soit acheminé à l'au moins un capteur.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que dans le cas d'une concentration trop faible de l'au moins un produit désinfectant dans le liquide de traitement mesurée après le lavage principal, le lavage principal est poursuivi sur une période de post-désinfection.
  7. Procédé selon la revendication 1, caractérisé en ce qu'avant de commencer la post-désinfection, une quantité de produit désinfectant est ajoutée au liquide de traitement, laquelle correspond à la concentration minimale de l'au moins un produit désinfectant dans le liquide de traitement à la fin du lavage, de préférence du lavage principal, et/ou à la fin de l'opération de désinfection.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la valeur pH du liquide de traitement avec l'au moins un produit désinfectant qui y est éventuellement encore présent est mesurée au moins avant et/ou après le lavage, de préférence après le lavage principal, l'échantillon étant notamment également utilisé pour cette mesure.
EP21168405.5A 2020-04-16 2021-04-14 Procédé de traitement par voie humide du linge Active EP3896143B1 (fr)

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Publication number Priority date Publication date Assignee Title
DE3916910A1 (de) * 1989-05-24 1990-11-29 Henkel Kgaa Einrichtung zum dosieren von desinfektionsmitteln
DE4412576A1 (de) * 1994-04-13 1995-10-19 Henkel Kgaa Sensorsystem zur Desinfektionsmittelerfassung und Dosierung in Textilwaschanlagen (Senking-Anlagen)
DE102016003200A1 (de) * 2016-03-17 2017-09-21 Herbert Kannegiesser Gmbh Verfahren zur Nassbehandlung von Wäsche

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