Washing method of continuous washing machine and continuous washing machine

Abstract

To obtain a washing method capable of reducing energy use amount required to heat washing water and allowing use of rinsing discharge water at high temperature in prewashing without decreasing detergency for laundry with blood or other stains.SOLUTION: A continuous washing machine reuses recovered water as prewashing water. The continuous washing machine is devised so as to be capable of performing optimal washing treatment for each batch according to washing quality considered necessary even in the objects to be washed of the same quality by addition and change of washing conditions corresponding to the type of the object to be washed with respect to the washing condition set for each type of the object to be washed, based on the washing quality determined for each level of stains of the object to be washed and temperature of recovered water used as prewashing water.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a washing method for a continuous washing machine that recovers washing water used in the rinsing process of laundry or wastewater generated by a dehydrator and reuses it as pre-washing water, and a continuous washing machine suitable for implementing the method.

Background Art

[0002] In a laundry factory that washes laundry brought in from accommodation facilities and medical facilities, the laundry to be washed is divided into customers and types of laundry (for example, sheets, towels, yukatas, surgical gowns, uniforms, personal items, etc.), and is made into a lump called a batch according to the processing capacity of the washing line, and washing is performed by specifying the machine and washing procedure to be used for each unit. Therefore, the controller of the industrial washing machine is provided with washing condition setting means for setting washing conditions (chemicals to be used, temperature of washing water, washing time, etc.) corresponding to the classification of customers and types.

[0003] The washing of the laundry is performed in the order of pre-washing, main washing, rinsing, and finishing. When the temperature of the washing water (pre-washing water) used in pre-washing exceeds 40°C or the hydrogen peroxide concentration contained in the pre-washing water is high, the detergency of laundry with protein stains, especially blood stains, etc. is significantly reduced. Therefore, when washing linen used in a medical institution, the washing water used in pre-washing is adjusted to a temperature of 40°C or lower and a hydrogen peroxide concentration of 30 ppm or lower. Also, for washing efficiency and disinfection of the laundry, it is desirable to perform the main washing with washing water at 80°C or higher.

[0004] Therefore, when shifting from pre-washing to main washing, the temperature of the washing water must be raised by about 40°C. If it takes time to raise the temperature, the time required for washing becomes long and productivity decreases. As a means for rapidly increasing the temperature of the washing water, high-pressure steam (primary steam) generated by a boiler is blown into the main washing tank to raise the temperature of the main washing water. In a laundry factory, steam is used as a heat source for various devices, and it is strongly desired to reduce the consumption of primary steam for energy saving and prevention of global warming.

[0005] In commercial washing machines, for water and energy conservation, the drainage from the finishing tub and the dehydrator is recovered and used as pre-washing water, and the drainage from the rinsing tub is recovered and used as main-washing water. Also, for the purpose of reducing the energy required for heating when shifting from pre-washing to main-washing, after draining the pre-washing water after pre-washing, the hot rinsing drainage generated in the rinsing process is recovered and supplied to the main-washing tub.

[0006] Patent Document 1 proposes a washing method in which washing is performed with first washing water containing a first alkaline detergent, second washing is performed with main-washing water containing a second alkaline detergent and hydrogen peroxide, in the finishing process after rinsing, treatment is performed with finishing water containing a neutralizing composition containing a sour agent and a hydrogen peroxide reducing agent, and the object to be washed is introduced into the first washing water in the first washing step using the input water including the drainage in the finishing process.

[0007] Also, Patent Document 2 discloses a technique for heating the new water supplied to the dehydrator drainage of a continuous washing machine and the rinsing drainage after heating the new water supplied to the finishing tub and the rinsing tub of the continuous washing machine, which is used as pre-washing water, and supplying the main-washing drainage to heat the new water for a washing and dehydrating machine for washing special objects to be washed.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] In the washing of articles to be washed with blood stains or the like, after pre-washing at 40°C or lower, it is necessary to heat the washing water up to 80°C, the main wash set temperature. Since the energy consumption is large and a high temperature-raising capacity is required, it is difficult to use heat sources other than the primary steam generated by a steam boiler, which is one of the factors making it difficult to save energy and take measures against global warming in a laundry factory.

[0010] In addition, in the method of supplying high-temperature rinsing drainage as the main wash water after draining the pre-wash water after pre-washing, it is difficult to drain the water absorbed by the laundry in a continuous washing machine. Therefore, it is difficult to significantly raise the temperature of the entire tank, and since the detergent concentration decreases due to the replacement of water, it is necessary to additionally add detergent during the main wash, resulting in a problem of increased detergent usage.

[0011] The amount of hydrogen peroxide input often varies depending on the type of article to be washed, and the hydrogen peroxide concentration of the recovered water also varies with the variation in the input amount. However, since there is no practical means for measuring hydrogen peroxide that can be used in a continuous washing machine with a short cycle time, it is actually difficult to maintain the hydrogen peroxide concentration at 30 ppm or less.

[0012] This invention has been made to solve the above problems of the prior art, and an object thereof is to obtain a washing method that can use high-temperature rinsing drainage for pre-washing without reducing the washability of laundry with blood stains or the like and can reduce the energy consumption required for heating the washing water.

Means for Solving the Problem

[0013] The washing method according to this invention is a washing method for a continuous washing machine 1 in which the recovered water collected from the rinsing tank c1 or the finishing tank d of the continuous washing machine 1 or the recovered water collected from the dehydrator 2 is reused as pre-wash water, for example, the input water to be put into the pre-wash tank a together with the article to be washed, the soaking water used in the first half of the pre-wash process, and the washing water to be additionally supplied to the pre-wash tank a during the pre-wash process.

[0014] In the present invention, according to the washing quality determined by the degree of dirt on the object to be washed and the temperature of the recovered water used as the pre-washing water for the washing conditions set for each type of object to be washed, the washing conditions for the relevant type are added or changed so that an appropriate washing process can be carried out for each batch according to the washing quality required for objects to be washed of the same quality. As a result, more appropriate washing can be achieved while saving water and energy.

[0015] The present invention is particularly effective for washing objects to be washed in the medical or nursing care fields where there is a risk of blood or protein adhesion. In the washing of objects to be washed such as sheets, towels, and white clothes that use bleach, in addition to the above-mentioned washing quality and the temperature of the recovered water, it is preferable to add or change the washing conditions for each batch according to the measured or estimated hydrogen peroxide concentration in the recovered water.

[0016] In the washing method of the present invention, a plurality of washing quality levels are determined according to the washing quality determined by the relationship between the degree of dirt on the object to be washed and the required finishing quality, and the washing conditions corresponding to each washing quality level, the temperature of the recovered water used as the pre-washing water, and preferably the hydrogen peroxide concentration in the recovered water are registered in the washing condition changing means of the washing machine 1, and washing is performed under the washing conditions corresponding to the washing quality level specified for each batch and the detected temperature and hydrogen peroxide concentration of the recovered water.

[0017] In the present invention, the recovered water is used as the soaking water (referring to the washing water used in the initial to early stage of the pre-washing process, including the input water introduced into the washing machine together with the object to be washed), and if necessary, fresh water is added. When the recovered water from the dehydrator 2 to the finishing tank d and the recovered water from the rinsing tank c (recovered warm water) are separately recovered, the pre-washing is performed using the recovered cold water, and if possible, the recovered warm water is added before the end of the pre-washing to continue the pre-washing.

[0018] The temperature of the recovered water to be used is measured by thermometers 46 and 47 provided in the recovered water tanks 3 and 4 for storing the recovered water. For washing machines without a recovered water tank, a thermometer may be provided in the finishing tank d or the rinsing tank c1 or the tank of the dehydrator 2 that is the source of recovery for measurement. The hydrogen peroxide concentration of the recovered water is either measured by a measuring instrument or estimated from the history of the hydrogen peroxide added.

[0019] The continuous washing machine of the present invention is provided with washing condition changing means for registering more preferable washing conditions corresponding to the temperature and hydrogen peroxide concentration of the recovered water used as immersion water and the washing quality level of the laundry items to be washed. Referring to the data registered in this washing condition changing means, the washing conditions in the pre-washing are automatically added or changed based on the specified washing quality level and the temperature and hydrogen peroxide concentration of the recovered water obtained, and the washing is performed.

[0020] The washing conditions to be added or changed include the amount of alkaline agent added to the immersion water, the amount of fresh water supplied to the immersion water, and whether or not or the amount of the recovered warm water recovered from the rinsing tank is supplied to the pre-washing tank as additional pre-washing water. Preferably, it includes whether or not to raise the temperature of the pre-washing water in the pre-washing tank a, the timing of starting the temperature rise, and the upper limit temperature.

[0021] A preferable means for estimating the hydrogen peroxide concentration of the recovered water is a method of estimating based on the supply amount of hydrogen peroxide supplied for washing the laundry items during the main washing of the laundry items processed in the dehydrator 2 or the finishing tank d. It may be estimated by the average value or weighted average value of the supply amount of hydrogen peroxide supplied during the main washing for the laundry items from 3 to 10 batches before the most recent time when the recovered water is supplied to the pre-washing tank.

Advantages of the Invention

[0022] According to the present invention, even when the hydrogen peroxide concentration of the recovered water or the temperature of the recovered water is high, it is possible to wash without significantly reducing the detergency of laundry items with blood stains or the like. By specifying the washing quality level, laundry items with less blood stains or the like can be operated with energy saving prioritized.

[0023] Moreover, if a means for estimating the hydrogen peroxide concentration is provided, there is no need to provide a hydrogen peroxide concentration sensor.

[0024] Therefore, it becomes possible to use the hot rinsing drainage for pre-washing or increase the temperature of the washing water during pre-washing without reducing the detergency of the object to be washed with blood stains or the like, and it is possible to reduce the energy consumption required for raising the temperature of the washing water when shifting from pre-washing to main washing.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0026] Hereinafter, the present invention will be further described with reference to the drawings. In FIG. 1 showing an embodiment of a continuous washing machine, 1 is a continuous washing machine, 2 is a dehydrator for dehydrating the object to be washed discharged from the continuous washing machine 1, 3 is a recovered cold water tank, 4 is a recovered warm water tank, 5 is a buffer tank mainly for storing the drainage from the main washing tank, and 6 and 7 are heat exchangers.

[0027] The object to be washed put into the input hopper 11 of the continuous washing machine 1 is washed in the pre-washing tank a, the main washing tanks b1 to b6, the rinsing tanks c1 to c3, and the finishing tank d, discharged from the discharge port 12, and put into the dehydrator 2. The inner cylinder of the continuous washing machine 1 repeats the swing and one rotation during the cycle time (usually 3 to 4 minutes) set by the washing condition setting means of the controller. The object to be washed put into the pre-washing tank a is sequentially transferred to the adjacent subsequent tank every time the inner cylinder rotates once, and is put into the dehydrator 2 from the discharge port 12. In the figure, the continuous washing machine 1 and the dehydrator 2 are shown separately, but actually, the dehydrator 2 is installed adjacent to the discharge port 12.

[0028] In the figure, within the circle, T represents a thermometer, within the circle, Lv represents a water level gauge, within the circle, P represents a pump, within the square, FM represents a flow meter, the valve symbol with a T-shaped handle is a manual valve, and the valve symbol with a square at the horizontal line part of the T-shape is an electromagnetic valve.

[0029] A general continuous washing machine 1 includes a plurality of main washing tanks b and a plurality of rinsing tanks c, and the washing water and rinsing water flow between the plurality of tanks in a counterflow or batch flow manner. Counterflow is a method in which the washing water flows in a direction opposite to the transfer direction of the object to be washed between the tanks, and batch flow is a method in which the washing water is transferred together with the object to be washed between the tanks. The continuous washing machine 1 shown in FIG. 1 has a batch flow for pre-washing and main washing and a counterflow for rinsing.

[0030] The continuous washing machine 1 in the figure separates and recovers the recovered water into cold water and warm water. The recovered cold water from the dehydrator flows into the recovered cold water tank 3 through the dehydration recovery pipe 15, and the recovered cold water from the finishing tank d flows into the recovered cold water tank 3 through the finishing water recovery pipe 14 and is stored. The recovered warm water from the rinsing tank c1 flows into the recovered warm water tank 4 through the rinsing water recovery pipe 13. The buffer tank 5 mainly stores the high-temperature drainage water from the main washing tank b6. Thermometers 46 and 47 are provided in the recovered cold water tank 3 and the recovered warm water tank 4.

[0031] The recovered water in the recovered cold water tank 3 is sent to the input hopper 11 through the cold water supply pipe 18 and the pre-washing water supply pipe 25 by driving the cold water pump 17 when the object to be washed is put into the input hopper 11. The recovered water in the recovered warm water tank 4 is sent to the input hopper 11 through the warm water supply pipe 23 and the pre-washing water supply pipe 25 by driving the warm water pump 22. The recovered water in the buffer tank 5 is sent to the heat exchanger 7 by driving the recovered drainage pump 29 to warm the fresh water supplied to the final rinsing tank c3. By this warming, the rinsing water is warmed, and the temperature of the recovered water in the recovered warm water tank 4 also rises.

[0032] In the pre-washing tank a and the first and second main-washing tanks b1, b2 of the continuous washing machine, flash steam can be supplied from the flash steam pipe 28 by opening the respective solenoid valves 31, 32, 33. The flash steam is steam obtained by evaporating the drain of the steam used in equipment (such as a dryer or a finishing machine for laundry) that uses the primary steam generated in the steam boiler as a heat source, by utilizing the sensible heat of the drain in a reduced-pressure environment.

[0033] Detergent supply devices 35, 36 are connected to the pre-washing water supply pipe 25 and the first main-washing tank b1. A bleaching agent (hydrogen peroxide) supply device 37 is connected to the second main-washing tank b2. An alkali agent supply device 38 is connected to the pre-washing tank a. The types or product names of the detergent, alkali agent, and bleaching agent are input to the controller, and the supply amount for each batch thereof is set in the washing condition setting means of the controller.

[0034] The continuous washing machine shown in Fig. 1 is provided with temperature-raising means 30, 40 that enable the pre-washing water in the pre-washing tank a to be heated during the cycle time. In the temperature-raising means 30, the pre-washing water in the pre-washing tank a is heated by opening the solenoid valve 31 and supplying flash steam to the pre-washing tank a.

[0035] The temperature-raising means 40 includes a circulation pipe 41 that circulates the pre-washing water in the pre-washing tank a, a circulation pump 42 provided in the pipe, and a heat exchanger 6. By opening the solenoid valve 43 and driving the circulation pump 42 during the cycle time, the pre-washing water in the pre-washing tank a is heated. As the heat source of the heat exchanger 6, the drain from the aforementioned dryer or finishing machine can be utilized, and the recovered drained water in the buffer tank 5 can also be utilized.

[0036] Also, a heat exchanger can be provided in the pre-washing water supply pipe 25, and the pre-washing tank can be heated by heating the recovered warm water with this heat exchanger and supplying it. In this case, the timing of warm water supply is 30 to 90 seconds after the completion of cold water supply, similar to the start of temperature-raising by the temperature-raising means 30 and 40.

[0037] In a laundry, articles to be washed are brought in by a plurality of customers. The articles to be washed brought in are sorted into batches for each batch according to the variety (e.g., sheets, towels, uniforms, personal items, plain-colored items, colored items, etc.) and the washing conditions of the equipment installed on the washing line. The continuous washing machine performs a washing operation according to the washing conditions corresponding to the sorted batch for each batch. The set washing conditions are, for example, the length of the cycle time, the amount of washing water, the availability of using recovered water, the supply amount of chemicals such as alkaline agents and bleaching agents, and the like.

[0038] In the present invention, the set washing conditions, particularly the washing conditions in the pre-washing process, are automatically adjusted according to the washing quality of the articles to be washed, the temperature of the recovered water, and the like. The washing quality of the articles to be washed here refers to the difference in the quality of the articles to be washed before and after washing or the finished quality of the articles to be washed after washing, that is, the degree and type of dirt on the articles to be washed and the finished quality after washing such dirt. Since it is difficult to strictly quantify the washing quality, in the examples of Table 1, it is classified into three types: washing quality priority, standard, and energy saving priority, by visual recognition of the operator who sorts the articles to be washed.

[0039]

Table 1

[0040] For articles from hospitals or the like, if the blood stain is large, a high washing quality is required to make it into the normal finished quality, and if there is no blood stain, the washing quality required to make it into the normal finished quality is low. For example, as shown in Table 2, it is classified into blood stain priority, standard, and energy saving priority.

[0041]

Table 2

[0042] Note that the temperature described in the column of the upper limit temperature of the fresh water for soaking in the table is the upper limit temperature when supplying fresh water heated by the heat exchanger as the soaking water. Specifically, when the fresh water outlet temperature of the heat exchanger 7 exceeds the upper limit temperature described in the table during fresh water supply, the drainage recovery pump 29 is stopped.

[0043] When washing a batch of laundry in the continuous washing machine 1, based on the washing quality level and the temperature of the recovered water used as soaking water, a table as exemplified in Tables 1 and 2 is registered in the washing condition changing means of the controller, and the washing conditions are automatically adjusted. Table 1 is an example of adding and changing washing conditions according to the washing quality level and the temperature of the recovered water used as soaking water, and Table 2 is an example of adding and changing washing conditions according to the hydrogen peroxide concentration level of the recovered water in addition to the washing quality level and the temperature level of the recovered water.

[0044] For laundry with heavy blood stains, the temperature of the pre-washing water, especially the temperature of the soaking water introduced simultaneously with the laundry, must be lowered, and high-temperature steam is required for the temperature increase when shifting from pre-washing to main washing. If there is no blood stain, the temperature of the pre-washing water can be increased, and the energy consumption when shifting from pre-washing to main washing can be reduced.

[0045] The detergency of stains in pre-washing is affected by the temperature of the soaking water that first contacts the laundry. In commercial washing machines, recovered cold water is usually used as soaking water for water conservation. Therefore, the thermometer 46 that measures the temperature of the recovered cold water tank 3 measures the temperature immediately before soaking water is sent, and based on the threshold value set in the controller, the temperature level is classified into "high", "medium", and "low". For example, 50°C or higher is "high", less than 50°C and 40°C or higher is "medium", and less than 40°C is "low", and the washing conditions are changed according to the washing quality level and the temperature level (Table 1).

[0046] The detergency of blood stains in pre-washing is also greatly affected by the hydrogen peroxide concentration of the soaking water that first contacts the laundry. Although it is difficult to measure the hydrogen peroxide concentration of the recovered cold water in the recovered cold water tank in a short time between cycle times, the hydrogen peroxide concentration of the recovered cold water in the recovered cold water tank 3 at the time of soaking water input can be estimated based on the history of the supply amount of hydrogen peroxide.

[0047] For example, the hydrogen peroxide concentration of the water recovered in the cold water tank (used as immersion water) is estimated from the amount of hydrogen peroxide input (set value or measured value) input to the laundry items about 3 to 10 batches before those discharged from the washing machine 1. Then, the average value of the hydrogen peroxide input amount for the target batch is obtained, and from that value, for example, 400 mL or more is set as "high", 400 mL or less and 150 mL or more is set as "medium", and less than 150 mL is set as "low".

[0048] According to the determination results of the blood stain level, immersion water temperature level, and hydrogen peroxide concentration level determined as described above, change the input amount of the alkaline agent input to the pre-washing tank a, the input amount of fresh water supplied as immersion water (replace part of the input amount of recovered cold water or recovered warm water with fresh water), the temperature setting of the pre-washing tank a, etc. (Table 2).

[0049] When separately supplying recovered cold water and recovered warm water as immersion water, it is desirable to supply only the recovered cold water, especially the recovered water from the dehydrator, first. When the temperature of the recovered cold water is high, or when the hydrogen peroxide concentration in the recovered cold water is high, replace part of the recovered cold water with fresh water and supply the recovered cold water after supplying the fresh water.

[0050] When supplying only recovered cold water as the input water, it is preferably 3 to 6 L / kg of recovered cold water depending on the variety. Here, L is liter and kg is the amount of laundry in one batch.

[0051] When supplying recovered cold water and recovered warm water as immersion water, it is preferably 2 to 4 L / kg of recovered cold water and 1 to 4 L / kg of recovered warm water depending on the variety. It is desirable to supply the recovered cold water first and supply the recovered warm water after more than 1 minute has elapsed after the supply of the recovered cold water is completed. In this way, the pre-washing water can be heated without reducing the detergency of blood stains and protein stains.

[0052] Also, when the temperature of the recovered cold water is high or the hydrogen peroxide concentration is high, for example, when the temperature of the recovered cold water is 50°C or higher, or the measured or estimated value of the hydrogen peroxide concentration is 100 - 200 ppmm or higher, for example, after supplying 1 L / kg of fresh water first, then supply the recovered cold water. When supplying fresh water, subtract the supply amount of fresh water from the set value of the supply amount of the recovered cold water for the immersion water. For example, when the set value of the recovered cold water as immersion water is 4 L / kg, after supplying 1 L / kg of fresh water, supply 3 L / kg of the recovered cold water.

[0053] It is desirable to use fresh water that has passed through the heat exchanger or fresh water heated by utilizing waste heat at this time. By supplying the heated fresh water, the pre-washing temperature can be maintained high even when fresh water is supplied, which saves energy. Since the hydrogen peroxide concentration can be reduced, the detergency of blood stains and protein stains can be maintained.

[0054] Note that the set values such as the amount of alkaline agent input, the supply amount of fresh water for immersion water, the upper limit of the fresh water temperature for immersion water, and the upper limit of the temperature increase in the first tank in Table 1 are set step by step, but it is also effective to set the values proportionally according to the temperature, hydrogen peroxide concentration, etc.

[0055] For example, as shown in Figure 2 regarding the amount of alkaline agent input, between the calculated values of 150 mL and 400 mL (L is liter) of the hydrogen peroxide input amount, the mode can be such that the amount of alkaline agent input changes proportionally according to the amount of hydrogen peroxide concentration between the standard amount and twice the standard amount. When the alkaline agent and the detergent are mixed and input in the same chemical tank, the input amount of the detergent also changes together with the alkaline agent.

[0056] Note that after using the recovered cold water and fresh water as immersion water, by supplying the recovered warm water to the pre-washing tank a during the pre-washing cycle, the temperature of the pre-washing water can be raised. Also, in the example of Figure 1, as means for raising the temperature of the pre-washing water in the pre-washing tank a, there are means 28, 31 for supplying flash steam to the pre-washing tank and means for circulating the pre-washing water through the heat exchanger 6.

[0057] The upper limit of the temperature increase in the first tank of Table 1 indicates the upper limit temperature when raising the temperature of the pre-washing water with these devices. Note that the timing of starting the temperature increase is as follows: measure the temperature of the pre-washing water 30 seconds after the start of the cycle time. If the temperature is 55°C or higher, start the temperature increase 90 seconds after the start of the cycle time. If it is 50°C or higher, start it 60 seconds later. If it is 40°C or higher, start it 30 seconds later.

[0058] If the temperature of the pre-washing water is increased by these means in the latter half of the pre-washing cycle, it is possible to reduce the energy required for the temperature increase of the washing water when shifting from pre-washing to main washing without impairing the detergency of blood stains.

[0059] Also, the continuous washing machine of the embodiment is an example of separately collecting cold water and hot water. However, there is also a device with one recovery tank, and in operating conditions where the supply amount of hydrogen peroxide is small, the recovered water from the hot water tank may be used as the immersion water. Even in such a case, the present invention enables more appropriate washing.

Explanation of Signs

[0060] 1 Continuous washing machine 2 Dehydrator 3, 4 Recovery water tank 6 Heat exchanger 18 Cold water supply pipe 23 Hot water supply pipe 25 Pre-washing water supply pipe 28 Flash steam pipe 30, 40 Temperature increase means 37 Bleaching agent (hydrogen peroxide) supply device 38 Alkali agent supply device 46, 47 Thermometer a Pre-washing tank b Main washing tank c Rinsing tank d Finishing tank

Claims

1. A washing method for a washing machine that performs a washing operation using washing conditions set corresponding to each variety of the articles to be washed for each batch grouped by each variety of the articles to be washed, in a continuous washing machine that uses the recovered water of the washing machine or the recovered water of a dehydrator that dehydrates the articles to be washed by the washing machine as the pre-washing water of the washing machine, a plurality of washing quality levels are determined according to the washing quality determined by the relationship between the degree of dirt of the articles to be washed and the required finished quality, and washing conditions corresponding to each washing quality level and the temperature of the recovered water are set in the washing machine, and washing is performed for each batch grouped by each washing quality level under the washing conditions corresponding to the washing quality level and the detected temperature of the recovered water. A washing method for a continuous washing machine.

2. Washing conditions corresponding to the washing quality level, the temperature of the recovered water, and the hydrogen peroxide concentration are set in the washing machine, and washing is performed for each batch grouped by each washing quality level under the washing conditions corresponding to the washing quality level, the detected temperature of the recovered water, and the hydrogen peroxide concentration. The washing method for a continuous washing machine according to Claim 1.

3. The washing method according to Claim 1 or 2, wherein the washing conditions include the amount of alkali agent added to the soaking water, which is the pre-washing water at the initial stage of the pre-washing process, and the amount of fresh water supplied.

4. The washing machine is a washing machine equipped with a temperature raising means for raising the temperature of the pre-washing water during the pre-washing process, and the washing conditions include the possibility of raising the temperature of the pre-washing water and the temperature raising start timing and the upper limit temperature of the pre-washing water when it is possible. The washing method according to Claim 1 or 2.

5. A continuous washing machine that uses the recovered water from the finishing tank, the rinsing tank, or the dehydrator as the pre-washing water, and is provided with washing condition setting means for setting washing conditions corresponding to the variety of the articles to be washed. In the continuous washing machine, a thermometer for measuring the temperature of the recovered water, and washing condition changing means for adding or changing according to the washing quality level of the articles to be washed into which a part of the washing conditions set by the washing condition setting means is input and the measured value of the thermometer. A continuous washing machine.

6. equipped with means for estimating or measuring the hydrogen peroxide concentration of the recovered water, and washing condition changing means for adding or changing according to the washing quality level of the articles to be washed into which a part of the washing conditions set by the washing condition setting means is input, the measured value of the thermometer, and the estimated or measured hydrogen peroxide concentration. The continuous washing machine according to Claim 5.

7. A continuous washing machine according to claim 5 or 6, comprising a temperature increasing means for heating the pre-washing water in the pre-washing tank, wherein an upper limit temperature of the pre-washing water is included in a part of the washing conditions added or changed by the washing condition changing means.

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