WO2011124344A1

WO2011124344A1 - Method for wet-treating, in particular cleaning, objects

Info

Publication number: WO2011124344A1
Application number: PCT/EP2011/001567
Authority: WO
Inventors: Wilhelm Bringewatt; Engelbert Heinz
Original assignee: Herbert Kannegiesser Gmbh
Priority date: 2010-03-29
Filing date: 2011-03-29
Publication date: 2011-10-13
Also published as: ES2675804T3; EP2552611A1; EP2552611B1; US20130061403A1; DE102011015188A1; JP2013523428A; DK2552611T3

Abstract

According to the method, a small amount is branched off from the treatment liquid to be reused as a sample, and only said sample is measured in regard to the concentration of at least one treatment additive still present in the treatment liquid used. Before the measurement, only a small part of the treatment liquid to be reused must be filtered as a sample. Only a relatively small filter is required for this purpose. The sample containing only a small amount of treatment liquid can be measured in an easier and more reliable manner.

Description

Process for wet treatment, in particular for cleaning, objects Description

The invention relates to a method for the wet treatment of articles in preferably a cleaning device according to the preamble of claim 1. Especially in the industrial sector, various objects are subjected to a wet treatment, in particular to clean. The invention relates to the wet treatment, in particular cleaning, of objects of all kinds, in particular the wet treatment of laundry items, container cleaning, in particular the cleaning of containers for food, bottle washing and washing systems for vehicles of all kinds and industrial facilities, such as conveyor belts.

In the wet treatment of objects at least one treatment additive having treatment liquid is used. From an environmental point of view, efforts are made to use the treatment fluid several times, because even used treatment fluid still has unused treatment additives. However, the prerequisite for the reuse of used washing liquid is that it still has sufficient treatment additives so that the objects to be treated next can be sufficiently treated, in particular washed.

It is known to measure the concentration of at least one treatment additive still present in the treatment liquid prior to the reuse of the treatment liquid in order to be able to determine whether the at least one treatment additive in the treatment liquid is sufficient for the reuse thereof. If necessary, due to the measurement, the treatment additive in question may be targeted before the reuse of the treatment

CONFIRMATION COPY be replenished lungsflüssigkeit. The measurement of the at least one treatment additive has so far been quasi "online" in the total flow of the treatment liquid. This has proved unfavorable in practice. The invention has for its object to provide a method for wet treatment of articles in preferably a cleaning device, whereby a simpler measurement of the treatment liquid is possible.

A method for achieving this object comprises the measures of claim 1. Accordingly, it is intended to branch off from the used and reusable treatment liquid preferably a small amount as a sample and to measure only this sample. It is no longer necessary to measure the entire treatment liquid. As a result, a simple measurement technique can be used, which is geared to small amounts of sample. After measuring, the quantitatively small sample may simply be disposed of.

The method can be developed in such a way that the sample is filtered before measurement, for example a microfiltration of the sample takes place. The filtration of the sample can be done in other ways and possibly also in several stages. By filtering only the small amount of sample, the process can be simplified. In particular, the measurement is reliable and more accurate possible. Because the sample contains only a small amount of the treatment liquid, it is not necessary to filter the entire treatment liquid before measuring. The filtration of the sample containing only a small amount of liquid can be carried out quickly and economically. The sample can also be filtered using filtration techniques that are relatively slow but reliable. It is preferably provided in the method to divert the sample from the used treatment liquid, preferably before reusing it. This can be done "in situ". Since the treatment liquid is separated from the objects to be treated before reuse, the sample can be separated from the treatment liquid outside the cleaning solution. simply measure the device. By diverting the sample from the treatment liquid prior to reuse, the measurement provides, in good time prior to reuse of the treatment liquid, the condition of the same giving measurement results. As a result, the treatment liquid can be influenced, for example by adding at least one treatment additive, before the treatment liquid again serves for the wet treatment of objects.

An advantageous embodiment of the method provides that the sample is taken from the treatment liquid to be reused after it has been recycled back to the cleaning device and / or a preparation tank for providing the treatment liquid to be reused for use in the cleaning device. This procedure ensures that the treatment liquid in the state in which it is reused is measured for the desired properties. In particular, when the treatment liquid to be reused is mixed from differently used treatment liquids or both used and unused treatment liquids, the mixture resulting therefrom can be checked for suitability by the measurement described above immediately before the treatment of objects to be cleaned.

Furthermore, it is preferably provided that the sample is branched off from the treatment liquid during operation of the cleaning device and / or measured. It is thus possible at an appropriate time to determine the condition of the treatment liquid. For example, it can thus be determined whether there are still sufficient detergent-active substances in the used treatment liquid. A preferred embodiment of the method provides for determining the remaining portion of the at least one treatment additive in the used treatment liquid and metering the respective treatment additive in a targeted manner when a minimum proportion of the at least one treatment additive in the treatment liquid is not reached. That way is ensures that even the reused treatment liquid still has a sufficient proportion of at least one treatment additive that is sufficient to clean the articles with the reused treatment liquid.

It is also preferably after the single or after each replenishment of the treatment liquid to be re-taken a small sample thereof and measured. It can thus be determined whether the dosing was sufficient. Optionally, it can be determined successively or iteratively by several targeted replenishment, whether the subsequent dosing is sufficient, and so the subsequent dosing is made specifically, without causing excessive overdosing.

A preferred embodiment of the device provides for the proportion of cleaning-active substances, disinfectants and / or bleach-active substances still present in the used treatment liquid to be determined during the ongoing treatment process. These are the essential treatment additives that must be present in the treatment fluid in a sufficient concentration to allow the treatment fluid to be reused.

The sample is derived according to a particularly advantageous embodiment of the invention after the measurement, in particular the proportion of at least one treatment additive still present in the treatment liquid, for example in an outflow.

The method is particularly advantageously suitable for a cleaning device embodied as a continuous washing machine in order to reuse used treatment liquid from the continuous washing machine for prewashing and / or clear washing. In the pre-wash and, where appropriate, the clear wash, used treatment liquid can be used particularly effectively repeatedly. Preferably, in a continuous washing machine, the treatment liquid from the pre-wash, the clear wash and / or from the rinsing process, at least partially reused. Treatment liquids from these treatment stages of the continuous washing machine are particularly suitable for reuse because they usually still contain a large proportion of unused washing-active substances.

Preferred embodiments of the invention will be explained in more detail with reference to the drawing. In this show:

1 shows a continuous washing machine with a subsequent dewatering device, in which the washed laundry is rinsed and dewatered, Fig. 2 shows an alternative embodiment of a continuous washing machine with a subsequent dewatering device for rinsing and draining washed laundry,

Fig. 3 shows a third embodiment of a continuous washing machine with a subsequent dewatering device for rinsing and

Draining washed laundry,

4 shows a continuous washing machine in which laundry is washed and rinsed,

Fig. 5 shows another embodiment of the continuous washing machine for

Washing and rinsing the laundry, and

Fig. 6 shows another alternative embodiment of a continuous washing machine for washing and rinsing laundry.

The invention will be described below in the context of the wet treatment of laundry in commercial laundries with a continuous washing machine 10 and a dewatering device 11 (Figures 1 to 3). The continuous washing machine 10 shown in FIG. 1 has a drum 12 that can be driven in rotation about a preferably horizontal axis of rotation. The laundry to be washed is transported by the line (in relation to FIG. 1) from left to right in the treatment direction 13 through the rotationally driven drum 12 , In the drum 12 a plurality of successive in the treatment direction chambers 15 are formed by transverse partitions 14. The chambers 15 may be the same size, but also be different sizes. The continuous washing machine 10 shown in FIG. 1 has four successive chambers 15, wherein a first or front chamber 15 seen in the treatment direction 13 forms a prewash zone 16. The three subsequent chambers 15 form a final wash zone 17.

The continuous washing machine 10 shown in FIG. 1 has no rinsing chamber. The rinsing of the laundry is therefore carried out in the at least one downstream of the continuous washing machine 10 arranged dewatering device 1 1. The dewatering device shown here 1 1 is a dewatering centrifuge. The drainage device 11 may also be a drainage press. The dewatering device 11 serves for rinsing and for dewatering the laundry which is only washed in the continuous washing machine 10.

The continuous washing machine 10 permits a so-called bath change in the first chamber 15 of the final wash zone 17, for which purpose the second chamber 15 seen in the treatment direction 13 is assigned a water-impermeable, stationary outer drum 19. The outer drum 19 is used to drain treatment liquid, in the present case Vorwaschflüssigkeit. If appropriate, the prewash liquid can also be discharged at the end of the prewash zone 16, that is to say in the first chamber 15. Then this (first) chamber 15 is assigned to the outer drum 19. It is also conceivable to assign an outer drum 19 to one or more further chambers 15 of the final wash zone 17. This is especially true when the continuous washing machine 10 operates on the countercurrent principle or even equipment in the continuous washing machine 10 is to take place. Where the outer drum 19 is provided, the drum 12 has at least one partially liquid-permeable, for example, perforated drum shell.

The dewatering device 11 shown here has a collecting tank 20 formed by the base of the dewatering device 11. Furthermore, two separate storage tanks 21 and 22 are provided. Each storage tank 21, 22 is connected via a supply line 23 to the collection tank 20 of the drainage device 11. The supply line 23 is shut off before each storage tank 21, 22 by a separate valve 24. However, it is also conceivable that the drainage device 1 1 has no collecting tank 20. Then, the treatment liquid from the dehydrator 11 passes directly into the storage tank 21 and / or 22.

From the storage tank 21, a discharge line 25 leads to the first chamber 15 of the Druchlaufwaschmaschine 10, namely the single chamber 15 of the prewash zone 16. In the illustrated embodiment, the drain line 25 is guided to a feed hopper 18 in front of the drum 12 of the continuous washing machine 10.

A second discharge line 26 leads from the storage tank 21 to the first chamber 15 of the final wash zone 17.

From the second storage tank 22, only the discharge line 25 leads to the feed hopper 18 at the beginning of the continuous washing machine 10. The discharge lines 25, 26 are each assigned a valve 27. By appropriate actuation of the valves 27, the storage tanks 21 and 22 are selectively emptied.

From the discharge line 25, which leads to the feed hopper 18, and from the discharge line 26, which leads to the second chamber 15, each branches off a bypass line 28 from. This leads to a pump 33 which supplies treatment liquid through the bypass line 28 to a measuring device 29. From the measuring device 29 leads a derivative 30 to a drain, not shown. The bypass line 28 has at the point where it branches off from the drain line 25 and at the point where it branches off from the drain line 26 in each case a valve 31 and 32, respectively. By appropriately opening and closing the valves 31 and 32, respectively targeted treatment liquid can be diverted from the drain lines 25 and 26 as a sample. It is also conceivable to design the pump 33 as a metering pump. Then, the valves 31 and 32 can be omitted, because the metering pump only a certain amount of treatment liquid as a sample from the drain lines 25 and 26 branches off when it is in operation.

Behind the pump 33, a filter 34 is arranged, with which the treatment line flowing through the bypass line 28 can be filtered with at least one treatment additive contained therein. With this filter 34, the measurement with the measuring device 29 impairing fine components of the used treatment liquid before the measuring device 29 are ausfilterbar. This can be done for example by a micro- and / or ultrafiltration. It is also conceivable to arrange a plurality of filters 34 in succession, which filter different substances, in particular different coarse substances, from the used treatment liquid. The substances to be filtered out may be lint and other foreign substances, but also undissolved constituents, preferably consumed constituents, of at least one treatment additive. In the latter case reaches the measuring device 29 only treatment liquid with unused treatment additives, which is still reusable for the treatment of the subsequent Wäschepostens with the used treatment liquid.

The measuring device 29 has at least one sensor (not shown) for measuring the concentration of at least one treatment additive in the treatment liquid branched off via the bypass line 28. Preferably, the measuring device 29 has a plurality of different sensors, whereby different properties of the used treatment liquid can be measured, which allow at least reliable conclusions about the proportion of unused washing-active substances in the re-use treatment liquid. The sensors may, for example, be a tensiometer for determining the concentration of washing-active substances in the treatment liquid. Alternatively or additionally, the sensor can be designed as an active chlorine sensor, with which disinfectant-active substances in the treatment liquid can be determined. Finally, it is alternative or additional also conceivable to form a sensor as a so-called H ₂ 0 ₂ sensor. Hereby, the content of bleaching-active substances in the treatment liquid can be determined. It is also conceivable that the measuring device 29 additionally or alternatively color sensors, turbidity sensors or means for detecting a color change, to determine the concentration of at least one treatment additive in the used treatment liquid. In the following, the method according to the invention will be explained in connection with the device of FIG. 1:

With the method, at least one treatment additive in the used treatment liquid is measured online during operation of the continuous washing machine 10 and / or the dewatering device 11. Preferably, the amount and / or concentration of the respective treatment additive in the treatment liquid is continuously measured. This is done according to the method of the invention thus "in situ". This measurement is carried out before and / or after the re-feeding of the treatment liquid to the continuous washing machine 10, but before the start of the treatment of a subsequent Wäschepostens with the reusable treatment liquid.

In the continuous washing machine 10 shown here, the laundry with the clear wash liquid from the final wash zone 17 passes into the dehydrator 1 1. First, the clear wash liquid is collected in the collection tank 20 of the dehydrator 1 1 and then a storage tank 21 or 22, preferably the storage tank 21, fed. Subsequently, the laundry is rinsed in the dewatering device 1 1 and dewatered. The resulting rinsing and dewatering liquid is also collected in one of the storage tanks 21 or 22, preferably in the storage tank 22.

According to the method of the invention, not all of the used treatment liquid, that is, the final wash liquid and the rinse or drainage liquid, are considered in terms of content and concentration therein Measured still existing treatment additives, but a small portion of the used treatment liquid with at least one treatment additive contained therein is branched off as a sample and filtered only in the filter 34 and this measured a small portion of the treatment liquid sample in the filter 34.

In the embodiment of FIG. 1, at the beginning of the discharge of the treatment liquid from the respective storage tank 21 or 22, the relevant valve 31 or 32 is opened briefly until a sufficient (small) amount of the used treatment liquid has been branched off to form the sample to be measured , Thereafter, the respective valve 31 or 32 is closed again. By the pump 33, the sample is pumped through the bypass line 28, first through the filter 34 for micro- or ultrafiltration and then through the measuring device 29. After the sample is measured, it leaves the measuring device 29 through the derivative 30. The measured Sample can then be discharged, for example, into a drain. The substance filtered out from the sample by the filter 34 is discharged through the discharge line 49, either for recycling to the treatment liquid or into a drain.

Preferably, a measurement of the at least one treatment additive in the used treatment liquid is selectively carried out. Separately, the treatment liquid is measured from the storage tank 21 or the storage tank 22. In this case, by opening either the valve 31 or 32 of the treatment liquid from the storage tank 21 or 22, a sample is branched off and thereby selectively the concentration or the proportion of at least one unused treatment additive in the treatment liquid from the storage tank 21 or 22 after filtering the measuring device 29 determined.

If, during the measurement of the treatment liquid, it has been determined that an insufficient quantity of the respective treatment additive or a specific treatment additive is contained in the used treatment liquid, a metered addition of the respective treatment additive can take place. This happens, for example, directly at the feed hopper 18 or during the supply of the treatment liquid via the drain line 26 into the second chamber 15. It is also conceivable to provide at least one metering device for metering treatment additives in the drain line 25 and / or 26, so that targeted at Supplying the used treatment liquid to the feed hopper 18 or the second chamber 15, the concentration of the at least one treatment additive or several treatment additives in the used treatment liquid in the necessary or desired manner can be increased.

The measuring device 29 has various sensors, with which at least the interfacial tension, the oxidation-reduction potential, the alkalinity, the turbidity, the ph value, conductance, peracetic acid, hydrogen peroxide and / or chlorine are taken from the previously used treatment liquid and previously filtered Sample is measured.

2 shows a further embodiment of the invention with a continuous washing machine 10 and a subsequent dewatering device 11, which is designed here as a dewatering press. The continuous washing machine 10 corresponds in principle to that of FIG. 1, which is why identical reference numbers are used for the same parts. The continuous washing machine 10 of FIG. 2 has a total of nine chambers 15. The fourth chamber 15, which is associated with an outer drum 19, immediately defines the end of the prewash zone 16 and the beginning of the final wash zone 17. However, it is conceivable that here two chambers 15th each having an outer drum 19 are provided, so that the last chamber of the prewash zone 16 and the first chamber of the final wash zone 17 own outer drums 19 have.

The dewatering press 11 are arranged downstream of two storage tanks 50, 51 in the illustrated embodiment. The storage tank 50 receives treatment liquid from the final wash zone 17, which is transferred together with the laundry from the continuous washing machine 10 in the dewatering press 1 and is separated from the laundry only here. The storage tank 51 receives rinsing liquid, which is obtained when rinsing the laundry in the dewatering press 11. To the rinsing of the laundry takes place in the dewatering press 1 1, a dewatering thereof, wherein a large part of the liquor bound in the laundry is pressed out of the laundry. The resulting dewatering liquid is discharged via a drain 52, for example to a drain. Optionally, the dewatering liquid can be collected in one of the storage tanks 50 or 51 or a separate storage tank. The storage tank 51 is connected via a supply line 53 to a preparation tank 54. From the preparation tank 54, treatment liquid to be reused by a closable outlet 55 can be supplied via an inlet funnel 56 together with a new batch of laundry to the first chamber 15 of the prewashing zone 16. The tank 50 is connected via a feed line 57 to the fourth chamber 15 at the beginning of the final wash zone 17. In addition, the storage tank 50 is connected to the supply line 53 to the preparation tank 54 with a lockable bypass line 58.

The outer drum 19 of the fourth chamber 15 at the end of the prewash zone 16 and at the beginning of the final wash zone 17 is associated with a valved sampling line 59 leading to a pump 33. The pump 33 is followed by a coarse filter 60 and then a filter 34 for the Iro- or ultrafiltration of the sample of the treatment liquid to be reused. The filter residue filtered out on the filter 34 is guided via a secondary line 61 past the measuring device 29 to a return line 62 leading to the fourth chamber 15 of the continuous-flow washing machine 10. The measuring device 29 following the filter 34 is supplied with the filtered sample of the treatment liquid to be reused. The measuring device 29 performs various measurements on the filtered sample, in particular it determines the residual content of unused washing-active substances in the treatment liquid to be reused. Preferably, the measuring device 29 performs the same measurements as mentioned in connection with the preceding description of the continuous washing machine 10 of FIG. From the preparation tank 54, a further sampling line 63 leads to a second pump 33 with a following coarse filter 60, a filter 34 for micro- or ultrafiltration and a subsequent measuring device 29, which can perform the same measurements as the measuring device 29 for the sample from the fourth Chamber 15. The measured sample is traceable through a return line 81 to the preparation tank 54. In the return line 81 opens a secondary line 64, which is attributable to the filter 34 accumulating filter residue via the secondary line 64 to the preparation tank 54. While in the illustrated embodiment, a sample from the fourth chamber 15 of the continuous washing machine 10 and from the preparation tank 54 each own pump 33 is associated with a coarse filter 60, a filter 34 and a measuring device 29, it is also conceivable only one pump 33, a Coarse filter 60, a filter 34 and a measuring device 29 to provide alternately a sample from the fourth chamber 15 of the continuous washing machine 10 or the preparation tank 54 to measure or investigate.

The method according to the invention runs in the context of the exemplary embodiment of FIG. 2 as follows:

In principle, the method of the exemplary embodiment of FIG. 2 corresponds to the method described in connection with the exemplary embodiment of FIG. 1. This applies in particular to the structure of the measuring device 29 and the measurements that can be carried out with it.

The process of the continuous washing machine 10 with the dewatering press 11 shown in Fig. 2 differs from that of Fig. 1 mainly in that the treatment liquid to be recycled is supplied either to the fourth chamber 15 at the beginning of the final wash zone 17 of the continuous washing machine 10 or the preparation tank 54. Alternatively or additionally, clear wash liquid and / or rinse liquid can be supplied to the preparation tank 54 or the fourth chamber from the relevant storage tank 50, 51 as the treatment liquid to be reused. Thus, in the preparation tank 54 and the fourth chamber 15 Clear wash and rinse are mixed as needed before being fed as reuse treatment liquid via the inlet funnel 56 of the pre-wash zone 16 or via the fourth chamber 15 of the final wash zone.

According to the invention, the liquid to be reused is measured in the preparation tank 54 or in the fourth chamber at the beginning of the final wash zone 17. This is the treatment liquid which is directly recycled and warmed or heated to the required temperature. As a result, the treatment liquid is measured in a state in which it is before it is brought into contact with the treatment liquid to be recycled to the next batch of laundry. The treatment liquid to be reused in the fourth chamber 15 at the beginning of the final wash zone 17 is diverted as well as the treatment liquid in the preparation tank 54 as a small sample directly from the fourth chamber 15 or the preparation tank 54, and then after coarse and microfiltration from the meter 29 subjected to the desired analysis or measurement. In this case, the treatment liquids from the first chamber 15 of the final wash zone 17 and the preparation tank 54 are measured separately from their own measuring device 29, so that the measurements can take place simultaneously (parallel). Conceivable, however, are also consecutive, separate measurements, for which only a single measuring device 29 is required. Also in the embodiment of Fig. 2, the measurement is used, inter alia, to determine whether the used treatment liquid still has enough residual detergent substances to be reused. If this is the case, a corresponding metering is carried out and then a new measurement of the content of washing-active substances in the treatment liquid to be reused in order to check whether the addition of fresh treatment liquid has taken place sufficiently. If necessary, a further replenishment and a repeated measurement to check whether the replenishment is sufficient. Fig. 3 shows another embodiment of the invention. This differs from the embodiment of FIG. 2 only in that the entire reuse treatment liquid is filtered and not only a small part of the reusable treatment liquid, which is checked by the respective measuring device 29, in particular with regard to the content of unused washing-active substances.

It is passed through a supply line 65 used treatment liquid from the prewash zone 16 on the outer jacket 19 of the fourth chamber 15 to a buffer tank 66. Likewise, the clear wash liquid to be reused as the treatment liquid and optionally the rinsing liquid from the dewatering device 11 via a supply line 67 into a buffer tank 68. Both buffer tanks 66, 68 is a common pump 69 downstream. The treatment liquid may be selectively supplied from the buffer tank 66 or 68 to the pump 69. The pump 69 pumps the treatment liquid through a coarse filter 60. From there, the coarsely filtered reusable treatment liquid is pumped by a pump 33 through the filter 34 for micro- and / or ultrafiltration of the treatment liquid to be reused. The treatment liquid coarsely and finely filtered by the filters 60 and 34 is then passed either into a subsequent buffer tank 70 or into a buffer tank 71. In the buffer tank 70 filtered treatment liquid passes from the buffer tank 66, while in the buffer tank 71 filtered treatment liquid from the buffer tank 68 is buffered. Filtered reusable treatment liquid passes from the buffer tank 70 into the preparation tank 54 via a feed line 72. Via another feed line 73, the filtered treatment liquid to be reused is passed from the buffer tank 71 to the fourth chamber 15 of the continuous washing machine 10 at the beginning of the final wash zone 17, preferably pumped. The inventive method is the same in the embodiment of FIG. 3 as in the embodiment of FIG. The method of FIG. 3 differs from the method of FIG. 2 only in that the entire treatment liquid to be recycled, namely used treatment liquid from the prewash zone 16 or treatment liquid from the Dewatering device 1 1 coarse filtered by the coarse filter 60 and is subjected by the subsequent filter 34 of a micro- or ultrafiltration.

4 shows a continuous washing machine 35, of which only the three successive treatment zones, namely the prewash zone 36, the final wash zone 37 and the rinse zone 38 are shown symbolically. In principle, the continuous washing machine 35 is constructed in the same way as the continuous washing machine 10, in particular has a drum which can be driven in rotation about a horizontal axis of rotation.

Because the continuous washing machine 35 has a rinsing zone 38, in the dewatering device, not shown in FIG. 4, behind the continuous washing machine 35, only dewatering of the laundry washed and rinsed in the continuous washing machine 35 takes place. The dewatering device may be designed in the manner of a centrifuge or a laundry press.

In the continuous washing machine 35 shown here, the treatment liquid from the respective zone can be separated from the laundry by a discharge line 39 by appropriately positioned external drums (not shown in FIG. 4). By means of valves 40, used treatment liquid originating from one or more zones can be supplied to a return line 41. The return line 41 makes it possible to return the used treatment liquid with the at least one additional treatment therein to a zone of the continuous washing machine 35. Valves 32 at the end of the return line 41 provide a targeted supply of used treatment liquid with at least one treatment additive to the prewash zone 36, the final wash zone 37 or rinse zone 38 possible.

In the through-flow washing machine 35 shown here, any treatment liquid used by all zones may be derived with at least one treatment additive and selectively returned to the subsequent wet treatment process of at least one selected zone. However, it is also conceivable, at the end of the prewash zone 36, ie in the last chamber of the same or at the beginning of the final wash zone, namely the first chamber thereof, It is also conceivable to reuse only the clear wash liquid and / or the rinse liquid by refeeding to the continuous washing machine 35, in particular the pre-wash zone 36, via the drain line 39 and the return line 41.

For circulating the treatment liquid to be reused with at least one treatment additive present therein, a circulating pump 43 is used in the return line 41. FIG. 4 shows no storage tanks for used treatment liquid. However, it is quite conceivable, as in the previous embodiments, to provide at least one storage tank, preferably in such a way that the discharge tank 39 discharges into the storage tank and the return line 41 starts from the bottom of the at least one storage tank.

Also in the embodiment of FIG. 4, a bypass line 44 is provided. This branches off from the drain line 39 and the return line 41, namely at a branch 48. In the bypass line 44, a pump 45, a subsequent filter 46 and a measuring device 47 are also arranged here. The pump 45 is designed here as a metering pump, so that at the junction 48 of the bypass line 44 from the return line 41 no valve needs to be present. Only when the dosing pump is in operation does it divert a sample of the used treatment liquid of the at least one treatment additive still present therein from the recycled treatment liquid in the return line 41. By a corresponding running time of the metering pump, the amount of branched off from the main stream of the treatment liquid used small partial flow, namely the sample determined. The filter 46 and the measuring device 47 work the same as the filter 34 and the measuring device 29 of the previous embodiments.

The method runs in the arrangement of FIG. 4 in principle as well as in connection with particular to the embodiment of FIG. 1 described. The designed as a metering pump 45 branches from Main flow of used treatment liquid from a small sample serving as a sample, which is first filtered and then examined in the measuring device 47 on the remaining here at least one active treatment additive, namely "in situ" during operation of the continuous washing machine 35th

The used treatment liquid to be examined with at least one treatment additive, in particular washing-active substances, may be prewash liquid, final wash liquid or rinse liquid, but also a combination of a plurality of said treatment liquids or all said treatment liquids.

FIG. 5, like FIG. 4, shows a continuous washing machine 35 for pre-washing, clear-washing, rinsing and optionally equipping the laundry. 5, all shown in the embodiment shown thirteen chambers 15 of the continuous washing machine 35. The continuous washing machine 35 is followed by a dewatering device 74, which in FIG. 5 is a dewatering press. The first four chambers 15 seen in the treatment direction of the continuous washing machine 35 form the prewashing zone 36. The subsequent chambers 15 five to nine form the final wash zone 37. The chambers 15 to twelve comprise the washing zone 38. The last, thirteenth, chamber 15 of FIG. The continuous washing machine 35 shown in FIG. 5 forms a finishing zone 75.

The fourth, fifth, ninth, tenth, twelfth and thirteenth chambers 15 of the continuous washing machine 35 of Fig. 5 are provided with outer drums 19 for draining used treatment liquids. Rinse liquid from the rinse zone 38 is discharged at the end thereof via the outer drum 19 of the twelfth chamber 15 into a storage tank 76. The liquid separated from the dewatered laundry by the dewatering device 74 is collected in the separate storage tank 77. A feed line 78 leads from the storage tank 76 to the fifth chamber 15 at the beginning of the final wash zone 37. A separate feed line 79 leads from the storage tank 77 to the preparation tank 54 at the inlet funnel 56 of the continuous washing machine 35. A lockable bypass line 80 connects the storage tank 76 to the feed line 79. so that rinsing liquid used alternatively by the storage tank 76 can be fed to the preparation tank 54.

In the continuous washing machine 35, small portions of the treatment liquid to be recycled can be sampled from the first chamber 15 of the final wash zone 37 (ie, the fifth chamber of the continuous washing machine 35 shown in FIG. 5) and the preparation tank 54, after the coarse filter 60 and then micro - or ultrafilter 34 of a measuring device 29 are supplied. For this purpose, as in the embodiment of FIGS. 2 and 3 of the fifth chamber 15 of the continuous washing machine 35, a sampling line 59 to the pump 33 is performed. The same applies to the sampling line 63 branching off from the preparation tank 54. Because the embodiment of FIG. 5 corresponds to the exemplary embodiment of FIG. 2 with regard to sampling, sample filtration and measurement, identical reference numerals are used for identical parts. The method of sample extraction, filtration and measurement is the same in the embodiment of FIG. 5 as in the embodiment of FIG. 2, so again reference is made to the explanations to the method of the embodiment of FIG. The reusable treatment liquid from the rinsing zone 38 and from the dewatering device 74 is not filtered in the embodiment of FIG. 5 and also not examined or measured in particular with regard to the content of unused washing-active substances. In this regard, in the embodiment of FIG. 5, only small samples of the treatment liquid to be reused from the first chamber 15 of the final wash zone 37, ie the fifth chamber 15 behind the inlet funnel 56, or preparation tank 54 after multiple filtering with different filter grades and optionally treatment additives such as in particular replenished with washing-active substances. FIG. 6 shows an exemplary embodiment of the invention which differs from that of FIG. 5 only in that a coarse filtration and subsequently an icy filtration or ultrafiltration of the entire used treatment liquid before reuse and before returning to the preparation tank 54 and / or The first chamber 15 of the final wash zone 37 takes place. Incidentally, the embodiment of FIG. 6 corresponds to that of FIG. 5, wherein the same reference numerals are again used for the same parts. The coarse filtration and subsequent micro- or ultrafiltration of the used treatment liquid from the prewash zone 36 and from the final wash zone 37 is the same as in the embodiment of FIG. 3. For the same parts the same reference numerals from FIG. 3 are used. Accordingly, used treatment liquid from the prewash zone 36 is stored in the buffer tank 66 while the buffer tank 68 receives used rinse liquid from the rinse zone 38. Accordingly, also here selectively or alternately used treatment liquid, namely Vorwaschflüssigkeit, from the buffer tank 66 and rinsing liquid from the buffer tank 68, the pump 69 and pumped from this through the coarse filter 60. From the subsequent pump 33, the coarsely filtered used treatment liquid is pumped through the filter 34 for micro- or ultrafiltration. The coarse and finely filtered used treatment liquid is then stored in either the buffer tank 70 or the buffer tank 71. In the buffer tank 70, the intermediate storage of filtered Vorwaschflüssigkeit takes place and in the buffer tank 71 filtered rinsing liquid is buffered. Coarse-filtered and micro-filtered treatment liquid is pumped out of the buffer tank 70 to the preparation tank 54 at the beginning of the continuous washing machine 35 via the supply line 72. Coarse-filtered and micro-filtered treatment liquid, in particular rinsing liquid, is pumped out of the buffer tank 71 via the supply line 73 to the fifth chamber 15, namely the first chamber of the final wash zone 37.

The removal of small samples from the clear wash liquid to be reused at the beginning of the final wash zone 17 and the treatment liquid to be reused in the preparation tank 54 is performed as in the case of the embodiment of the invention. taken from the example of FIG. 5, roughly filtered and subjected to various measurements after microfiltration. In particular, the proportion of unused washing-active substances in the reusable treatment liquid is determined. The measuring device 29 preferably has various sensors, with which the interfacial tension, the oxidation-reduction potential, the alkalinity, the turbidity, the pH, the conductance, the peracetic acid content, hydrogen peroxide and / or chlorine of the sample to be reused from the continuous washing machine 35 be determined. The sample is preferably taken from the treatment liquid to be measured or analyzed, if this has the temperature required for the respective treatment of the laundry items, that is, has been appropriately heated or warmed up. Thereby, the measurement of the sample can be made in a state that the sample has for the treatment of the laundry items. If the measurement of the filtered sample has shown that a subsequent dosing of at least one treatment additive is required, at least once a subsequent dosing and a subsequent new sampling takes place with a repeated measurement of this new sample.

The invention has been described above in the context of wet treatment, namely the washing and dewatering of laundry in commercial laundries. However, the invention is also suitable for washing laundry in household washing machines and for cleaning any other objects, for example for dishwashers, for container cleaning, especially bottle cleaning, for car washes, washing streets, for cleaning equipment, such as conveyors, in food technology and similar purposes , The use of the method according to the invention is thus not limited to the described purposes, in particular not to the wet treatment of laundry. LIST OF REFERENCE NUMBERS

10 continuous washing machine 48 diversion

11 Drainage device 49 Drainage

12 drum 50 storage tank

13 Treatment 51 Storage tank

14 partition 52 drain

15 chamber 53 supply line

16 Prewash zone 54 Preparation tank

17 Clearwash zone 55 Drain

18 feed funnel 56 feed funnel

19 outer drum 57 supply line

20 Collection tank 58 Bypass line

21 Storage tank 59 Sampling line

22 Storage tank 60 coarse filter

23 Supply line 61 Secondary line

24 valve 62 return line

25 Drain line 63 Sampling line

26 discharge line 64 secondary line

27 Valve 65 supply line

28 Bypass line 66 Buffer tank

29 Measuring system 67 Supply line

30 discharge 68 buffer tank

31 valve 69 pump

32 valve 70 buffer tank

33 pump 71 buffer tank

34 Filter 72 supply line

35 Continuous washing machine 73 Supply line

36 Prewash zone 74 Drainage facility

37 final wash zone 75 finishing zone

38 Rinse zone 76 Storage tank

39 drainage line

KAN-513-WO

40 valve March 23, 2011

41 return line

77 storage tank

42 Valve 78 Supply line

43 circulating pump

79 supply line

44 bypass line

80 bypass line

45 pump

81 return line

46 filters

47 measuring device

Claims

claims

1. A process for the wet treatment of articles with preferably a cleaning device, wherein the articles are treated with a treating additive having at least one treatment liquid and the treatment liquid is measured, characterized in that a sample is branched off from the treatment liquid and only this sample is measured.

2. The method according to claim 1, characterized in that the sample is filtered before measuring, preferably a microfiltration of the sample takes place.

3. The method according to claim 1 or 2, characterized in that the sample of the used treatment liquid, preferably before the reuse of the used treatment liquid, is branched off.

4. The method according to any one of the preceding claims, characterized in that the sample is taken from the treatment liquid to be reused, after this has been returned to the cleaning device and / or a preparation tank for providing the treatment liquid to be reused.

5. The method according to any one of the preceding claims, characterized in that the sample is diverted during operation of the cleaning device of the used and reused treatment liquid, filtered and then measured.

6. The method according to claim 5, characterized in that from the sample of the treatment liquid to be reused prior to the measurement filtered components of the reusable treatment liquid, preferably the reusable treatment liquid before and / or in the cleaning device, are fed again.

7. The method according to any one of the preceding claims, characterized in that the remaining portion of the at least one treatment additive is determined in the treatment liquid to be reused and falls below a minimum proportion of at least one treatment additive in the treatment liquid is a targeted re-dosing of the respective treatment additive.

8. The method according to claim 7, characterized in that after the or each replenishment of the reusable treatment liquid keit taken again a sample, the sample is filtered and then measured.

9. The method according to any one of the preceding claims, characterized in that the proportion of cleaning active substances remaining in the used treatment liquid, disinfecting substances and / or bleach-active substances by measuring the preferably previously filtered sample is determined.

10. The method according to any one of the preceding claims, characterized in that the sample is derived after the measurement, for example, in an outflow.

1 1. A method according to any one of the preceding claims, characterized in that when trained as a continuous washing machine

Cleaning device, the used treatment liquid for pre-washing and / or clear washing is reused.

12. The method according to any one of the preceding claims, characterized in that the used treatment liquid is reused for prewashing, clear washing and / or rinsing.