JP2019154840A - Washing method using water soluble bag body - Google Patents

Abstract

To provide a washing method capable of sufficiently dissolving a water soluble bag body such as a water soluble laundry bag in a washing process.SOLUTION: A washing method of an object to be washed includes a first washing step and a second washing step performed after the first washing step, and the object to be washed is washed in a state of being stored in a water soluble bag body. In the first washing step, pH of a washing solution is within a range of 4.5-9, and a solution temperature of the washing solution is within a range of 30°C-60°C. In the second washing step, the solution temperature of the washing solution is equal to or higher than 60°C.SELECTED DRAWING: None

Description

  The present invention relates to a washing method in which an object to be washed is housed in a water-soluble bag and washed by a washing machine so as to be washed without directly contacting the article to be washed.

  In medical facilities such as hospitals, linen products such as sheets, wrapping cloths, and white robes are often used. These linen products are usually washed (washed) and reused, but the linen products are contaminated with body fluids, and such stains may contain contaminants such as pathogens. There is.

  Therefore, in a medical facility, an object to be cleaned (such as an object to be washed or an object to be washed) such as a linen product that is soiled in a water-soluble bag is sealed and collected, and the bag is transported to a cleaning facility. In the washing facility, the object to be washed is washed with a washing machine while being housed in a sealed manner without taking out the object to be washed from the bag. Thereby, since it is avoided that a medical worker or a laundry worker touches the dirty washing object, the possibility of secondary infection or diffusion of contaminants can be effectively suppressed.

  By the way, the dirt of the object to be collected collected in the medical facility is mainly a body fluid such as blood, but the body fluid containing blood often contains protein. Since the three-dimensional structure of protein is altered by denaturation with heat or the like, it adheres firmly to the fiber. Since proteins that adhere firmly cannot be easily removed by ordinary washing methods, various washing methods have been proposed in the past to remove protein-based stains.

  For example, Patent Document 1 includes a first washing step, a second washing step, and a rinsing step for the purpose of efficiently removing protein-based composite stains derived from blood and inorganic stains. Discloses a selection method for adjusting the pH of the cleaning liquid to 10 or more. In this washing method, the washing machine used is a continuous washing machine having two or more washing tanks for performing the first washing step. Further, in the first cleaning step, the liquid temperature is limited within the range of 46 ° C. to 60 ° C., the detergent concentration is also limited, and the flow of the cleaning liquid is limited to co-flow with the article to be cleaned. Furthermore, also in the second washing step and the rinsing step, the flow of the washing water or the rinsing water is limited to cocurrent flow and / or countercurrent, and the washing temperature in the second washing step is limited to 46 ° C to 85 ° C.

Japanese Patent No. 6168339

  By the way, in the washing method using a water-soluble bag body, it became clear that a water-soluble bag body might not fully melt | dissolve in the washing process depending on the situation, but a part might remain. Generation | occurrence | production of such undissolved residue (residue) may adhere to the textiles after washing | cleaning, and may cause trouble in washing facilities as well as reducing the quality of washing (washing).

  The purpose of the washing method disclosed in Patent Document 1 is to remove protein-based composite soil. Therefore, even if a water-soluble bag body is used in this washing method, the undissolved residue of the water-soluble bag body cannot be effectively suppressed or prevented.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a washing method capable of sufficiently dissolving a water-soluble bag body such as a water-soluble laundry bag in a washing process. To do.

  A washing method according to the present invention is a method for washing an object to be washed, which includes a first washing step and a second washing step performed after the first washing step, in order to solve the above-described problem, The object to be washed is subjected to washing in a state of being stored in a water-soluble bag, the pH of the washing liquid in the first washing step is in the range of 4.5 to 9, and the temperature of the washing liquid is 30 ° C. It is the range which is in the range of -60 degreeC, and the liquid temperature of the washing | cleaning liquid in said 2nd washing | cleaning process is 60 degreeC or more.

  According to the above configuration, when the article to be washed is stored in the water-soluble bag and washed as it is (washing), the pH and temperature of the washing liquid in the first washing step are adjusted within the predetermined range, and the second washing In the process, at least the lower limit of the liquid temperature is limited. Thereby, the water-soluble bag body which accommodates to-be-washed | cleaned material can be dissolved favorably in the washing | cleaning process. As a result, it is possible to effectively avoid the possibility that the undissolved residue of the water-soluble bag body adheres to the article to be washed and deteriorates the quality of washing (laundry) or causes trouble in the laundry facility.

  In the washing method having the above configuration, the pH of the cleaning liquid in the second cleaning step may be 8 or higher, and the liquid temperature may be 70 ° C. or higher.

  Moreover, in the washing method of the said structure, the structure which has the water solubility which melt | dissolves at the water temperature of 80 degrees C or less may be sufficient as the said water-soluble bag body.

  In the washing method having the above-described configuration, the water-soluble bag body may be formed of at least a water-soluble resin film, and the water-soluble resin film may have a thickness of 500 μm or less.

  Moreover, in the washing | cleaning method of the said structure, the structure whose thickness of the said water-soluble resin film exists in the range of 1-100 micrometers may be sufficient.

  In the washing method having the above-described configuration, at least one of the first cleaning step and the second cleaning step may be configured to adjust the pH of the cleaning liquid by adding a pH adjusting agent.

  In the washing method having the above-described configuration, the article to be washed may be configured such that at least biological fluid derived from a living body is adhered as dirt.

  In this invention, there exists an effect that the washing | cleaning method which can fully melt | dissolve water-soluble bag bodies, such as a water-soluble laundry bag, in a washing process can be provided by the above structure.

  Hereinafter, typical embodiments of the present disclosure will be specifically described. The washing method according to the present disclosure includes a first washing step and a second washing step performed after the first washing step, and the article to be washed is provided for washing in a state of being stored in a water-soluble bag. The In the first cleaning step, the pH of the cleaning liquid is adjusted to be in the range of 4.5 to 9, and the temperature of the cleaning liquid is adjusted to be in the range of 30 ° C to 60 ° C. In the second cleaning step, at least the temperature of the cleaning liquid is adjusted to 60 ° C. or higher.

[Washed items and water-soluble bags]
In the washing method according to the present disclosure, the object to be washed is not used for washing (washing) as it is, but is housed in a water-soluble bag for washing. Although the to-be-washed object in this indication is not specifically limited, As a typical example, the thing to which the bodily fluid derived from a living body adhered as dirt can be mentioned. Examples of the living body include mammals including humans, but animals other than mammals may be used. Body fluids are basically retained in the body, such as blood, lymph, and digestive fluid (including saliva), or basically, such as sweat, tears, urine, runny nose, semen, and milk. And fluids that are excreted or secreted outside the body.

  A variety of substances can be used as the stain component contained in the body fluid, and a typical example of the stain substance is protein. The body fluid is mostly water if it is an excretion type such as sweat, tears, or urine, but the body-holding or secreting body fluid usually contains protein. Proteins may be firmly attached to an object to be washed due to a change in the three-dimensional structure due to denaturation by heat or the like. Therefore, it should be particularly noted as a dirt substance.

  The specific type of the object to be cleaned is not particularly limited, and examples thereof include general fiber products. In the present disclosure, typically, linen products (linens, linen products) ).

  Linen products in the present disclosure do not refer to “narrow linen products”, that is, linen products containing flax, but “broad definition linen products”, ie, textile products in general used in hospitals, welfare facilities, hotels, restaurants, etc. . “Broad linen products” are not limited to specific types of fibers, and include hemp products, cotton products, chemical fiber products, and the like. Specific examples of linen products in the present disclosure include bed linens such as sheets, duvet covers, pillow covers, towels; clothing such as white robes, surgical clothing, and hospitalized clothing; table linens such as table cloths and napkins; There are no particular limitations.

  When the object to be cleaned in the present disclosure is a linen product as described above, the place where the object is generated may be a place where the linen product is used. When it is dirty, examples of the place where the washing object is generated include a medical facility such as a hospital.

  There is a high possibility that a body fluid adheres to an object to be washed generated in a medical facility, and in particular, when blood adheres, there is a possibility of secondary infection via the object to be washed. Therefore, the necessity of storing the article to be washed in the water-soluble bag body is increased. Accordingly, in the present disclosure, blood stain can be given as a representative example of body fluid stain. From the viewpoint of suppressing or avoiding contamination such as secondary infection, if the item to be washed has body fluid contamination generated in a medical facility, the item to be washed is not simply stored in the water-soluble bag, It is stored in a sealed state in a water-soluble bag so that dirt on the object to be washed does not diffuse outside.

  In the present disclosure, the water-soluble bag body for storing the article to be washed is not particularly limited as long as it has water solubility, but typically, a bag body made of a water-soluble resin film can be mentioned. Such a water-soluble bag is generally called a water-soluble laundry bag. When used in a medical facility such as a hospital, it may be called a hospital laundry bag or a medical laundry bag.

  The specific kind of water-soluble resin film used for water-soluble bag bodies, such as a water-soluble laundry bag, is not specifically limited. Typical water-soluble resins include, for example, water-soluble vinyl resins such as polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, and polyvinyl methylene ether; polyether resins such as polyethylene oxide; carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, and the like. Cellulosic resins; acrylic resins such as polyacrylates, polymethacrylates, or salts thereof; polysaccharide polymers such as alginic acid, pullulan, xanthan; and the like.

  Any of these water-soluble resins may be modified by a known method. Moreover, only 1 type of these water-soluble resins may be selected and used for a water-soluble resin film, and 2 or more types may be used in combination as appropriate. A typical example is a water-soluble resin film mainly composed of polyvinyl alcohol (consisting of at least polyvinyl alcohol).

  Although the thickness (film thickness) of a water-soluble resin film is not specifically limited, The upper limit should just be 500 micrometers or less, it is preferable if it is 100 micrometers or less, and it is more preferable if it is 50 micrometers or less. The lower limit is not particularly limited, but may be 1 μm or more, may be 5 μm or more, and may be 10 μm or more. As a preferable range of the film thickness, for example, a range of 1 to 100 μm can be mentioned, a range of 5 to 50 μm or a range of 10 to 40 μm may be used.

  When the thickness of the water-soluble resin film exceeds 500 μm, there is a possibility that sufficient water-solubility cannot be exhibited. On the other hand, if the thickness of the water-soluble resin film is too small, sufficient strength may not be exhibited. For example, when the article to be washed is stored in a water-soluble laundry bag, the bag may be broken by the weight of the article to be washed, or may be broken during transportation of the water-soluble laundry bag. Therefore, although it depends on the type of resin constituting the water-soluble resin film, generally it may be 1 μm or more.

  Moreover, the water-soluble resin film should just have the solubility with respect to warm water. The range of warm water here is not specifically limited, What is necessary is just normal temperature (for example, within the range of 5-35 degreeC) or more, but the upper limit should just be 80 degrees C or less, for example. If the item to be washed is generated at a medical site, when the item to be washed is selected, generally, hot water disinfection is performed by treating with hot water of 80 ° C. or more for 10 minutes or more. Therefore, the water-soluble resin film should just have the water solubility which melt | dissolves with warm water below 80 degreeC (or less than 80 degreeC) which is the minimum temperature of hot water disinfection.

  In addition, 70 degreeC or less may be sufficient as the upper limit temperature of the hot water in which a water-soluble resin film shows water solubility, and 65 degreeC or less may be sufficient as it. Moreover, the lower limit temperature of warm water is not particularly limited, but is preferably 45 ° C. or higher, and more preferably 50 ° C. or higher. When the lower limit temperature of the hot water is less than 45 ° C., the water-soluble laundry bag may break when left for a long time under a high temperature and high humidity condition even within the range of normal temperature.

  The water-soluble resin film may contain components other than the water-soluble resin described above. Examples of components other than the water-soluble resin include various additives known in the field of resin film formation. Moreover, a known antibacterial agent may be contained from the viewpoint of suppressing secondary infection and the like, and a known deodorant may be contained from the viewpoint of suppressing malodor due to decay of body fluids.

  A water-soluble bag body such as a water-soluble laundry bag only needs to include a bag body composed of at least a water-soluble resin film, but may include a member other than the bag body. Specifically, for example, a sealing member for sealing the bag can be mentioned. The specific sealing member is not particularly limited, and may be, for example, a string member or a ribbon member for hermetically sealing the opening of the bag, or a fastener member attached to the opening of the bag. May be. Since the sealing member preferably also has water solubility, a ribbon member composed of at least a water-soluble resin is preferably used.

  Here, the water-soluble bag body such as a water-soluble laundry bag has durability against water wetting at normal temperature (referred to as “water wetting resistance” for convenience) and strength that does not break the bag under normal handling (referred to as “bag strength” for convenience). ), Easily dissolved in warm water (for convenience, referred to as “warm water solubility”) and the like. Of the above-described physical properties relating to the water-soluble resin film, the limitation on the water temperature of the warm water contributes to the resistance to water wetting and the solubility in the warm water, and the film thickness contributes to the bag strength and the solubility in the warm water.

  Specifically, if the object to be cleaned that is hermetically contained contains a lot of moisture, the water-soluble laundry bag (water-soluble bag) gets wet and the object to be cleaned becomes heavy. If the water-soluble laundry bag has water resistance and bag strength, the possibility that the water-soluble laundry bag breaks during transportation can be effectively avoided. In the washing facility, warm water is used for washing an object to be washed. Therefore, if it has warm water solubility, the water-soluble laundry bag dissolves in the washing liquid and disappears during the washing process. Therefore, only the article to be cleaned can be recovered after cleaning.

  Here, among the physical properties required for a water-soluble laundry bag (water-soluble bag body), the wettability and the hot water solubility are solubility in water (water solubility) unless the temperature is limited. it can. Therefore, it can be said that the wettability and the hot water solubility are physical properties that are difficult to be compatible with each other. In order to improve the bag strength, as described above, it is possible to increase (thicken) the thickness (film thickness) of the water-soluble resin film. However, when the film thickness is increased, water solubility tends to decrease. . Therefore, the bag strength and the hot water solubility can also be physical properties that are difficult to be compatible with each other.

  In this way, in the water-soluble laundry bag, a plurality of physical properties that are difficult to be compatible with each other is required, so in the washing process, depending on the situation, the water-soluble laundry bag does not fully dissolve and part of it remains, in other words, The undissolved residue of the water-soluble resin film may occur. When undissolved (residue) is generated in this manner, it may adhere to the textile product after washing and reduce the quality of washing (washing). Moreover, when the undissolved residue is transferred from the washing machine to the dryer, the water-soluble resin film is heated and carbonized in the drying process, and may be burnt in the dryer. Furthermore, if the washing facility is a continuous washing machine, the object to be washed is continuously supplied, and therefore, there is a possibility that undissolved material may affect the object to be supplied later.

  In the washing method according to the present disclosure, the water-soluble bag body (water-soluble laundry bag) that requires such contradictory physical properties is satisfactorily dissolved in the washing process, and the occurrence of undissolved residue of the water-soluble resin film is substantially reduced. Can be avoided or prevented.

[How to wash]
As described above, the laundry method according to the present disclosure only needs to include the first cleaning step and the second cleaning step, but may include other steps. As described above, the second cleaning step may be a step that is performed later in time than the first cleaning step. Examples of the other processes include a rinsing process and a finishing process, but may include other cleaning processes performed after the second cleaning process or other cleaning processes performed before the first cleaning process. Alternatively, other steps other than the cleaning step, the rinsing step, and the finishing step may be included.

  The first cleaning step can be positioned, for example, as a step of performing preliminary cleaning (preliminary cleaning step or pre-cleaning step), and the second cleaning step performed after the first cleaning step is, for example, a step of performing main cleaning (main Can be positioned as a washing step). Also, the first cleaning process is positioned as the first cleaning process, the second cleaning process is positioned as the second cleaning process, and the preliminary cleaning process is performed as another cleaning process before the first cleaning process. You may go.

  In the first cleaning step, the pH of the cleaning liquid is adjusted within the range of 4.5 to 9, and the liquid temperature of the cleaning liquid is adjusted within the range of 30 ° C to 60 ° C. The pH of the cleaning liquid may be adjusted by selecting the type of detergent or surfactant used in the cleaning liquid, but it is preferable to add a pH adjusting agent to the cleaning liquid. Accordingly, the pH of the cleaning liquid can be easily adjusted to a desired value or a desired range.

  The specific kind of pH adjuster used for pH adjustment of the cleaning liquid is not particularly limited as long as it does not affect the fiber product after cleaning. Typically, an inorganic acid of a weak acid, an organic acid, a weak acid salt of an alkali metal, an ammonium salt of a weak acid, an alkali metal hydroxide, and the like can be given. Specifically, examples of the weak acid inorganic acid include phosphoric acid and oxalic acid. Examples of the organic acid include citric acid, tartaric acid, ascorbic acid, malic acid, fumaric acid, succinic acid, malonic acid, and lactic acid. Examples of weak alkali metal salts include sodium borate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, and sodium sesquicarbonate. Examples of the weak acid ammonium salt include ammonium carbonate. Examples of the alkali metal hydroxide include sodium hydroxide and potassium hydroxide.

  In the second cleaning step, at least the temperature of the cleaning liquid is adjusted to 60 ° C. or higher. 70 degreeC or more may be sufficient as the minimum of the liquid temperature of the washing | cleaning liquid in a 2nd washing | cleaning process, and 80 degreeC or more can be mentioned as a preferable example. In the first cleaning step and the second cleaning step, the method for adjusting the liquid temperature of the cleaning liquid is not particularly limited, but usually a water temperature adjusting function provided in the washing machine to be used may be used.

  In the second cleaning step, the pH of the cleaning liquid is not particularly limited, but the pH of the cleaning liquid is preferably 8 or more. Therefore, in the second cleaning step, the pH of the cleaning liquid is 8 or more and the liquid temperature is preferably 70 ° C. or more. The pH of the cleaning liquid in the second cleaning step may be adjusted by adding a pH adjuster as described in the first cleaning step (of course, it may be performed by selecting the type of detergent or surfactant).

  The specific components and composition of the cleaning liquid used in the first cleaning process and the second cleaning process are not particularly limited. As the cleaning liquid, those containing a known detergent or surfactant can be used according to the type of the object to be cleaned or the type of dirt. In particular, if the article to be washed is a textile product such as a linen product having body fluid contamination, a detergent containing a nonionic surfactant can be suitably used.

  Although the specific kind of nonionic surfactant is not specifically limited, Typically, what is represented by the following general formula (1) can be used suitably.

R ₁ O (CH ₂ CR ₂ HO) _n H (1)
In the general formula (1), R ₁ is a hydrocarbon group having 6 to 18 carbon atoms, R ₂ is a hydrogen atom (H) or a methyl group (CH ₃ ), and n is 5 to 20 Is an integer.

  Although the detergent containing the nonionic surfactant represented by the general formula (1) is not particularly limited, specifically, for example, trade name: Greenfield manufactured by Genbu Co., Ltd. or trade name: Superfine Biology etc. can be mentioned. By using such a detergent in at least one of the first washing step and the second washing step, the solubility of the water-soluble bag (water-soluble laundry bag) can be improved.

  The cleaning liquid may contain other known components in addition to the detergent or surfactant. Specific examples include chelating agents, bleaching agents, dissolution accelerators, enzymes, fluorescent whitening agents, antifoaming agents, reducing agents, dyes, and fragrances, but are not particularly limited. Further, the cleaning liquid used in the first cleaning process and the cleaning liquid used in the second cleaning process may have the same composition or different compositions. For example, depending on the type of the object to be cleaned or the type of dirt, a suitable cleaning solution may be prepared and used for each purpose of the first cleaning step and the second cleaning step. The same applies when performing a cleaning process other than the first cleaning process and the second cleaning process.

  In the washing method according to the present disclosure, the rinsing process may be performed after the second cleaning process. The specific configuration of the rinsing process is not particularly limited, and for example, the liquid temperature of the rinsing water can be set as appropriate. Moreover, you may add a well-known additive to rinse water also in a rinse process.

  In the present disclosure, the flow of the cleaning liquid in the first cleaning step and the second cleaning step is not particularly limited, and may be cocurrent (batch flow) or counterflow (counter flow). The same applies to the flow of rinse water in the rinse step.

  The specific configuration of the washing machine that executes the washing method according to the present disclosure is not particularly limited, and may be a continuous washing machine or a batch washing machine. If the item to be washed is a textile product such as a linen product having body fluid stains, a continuous washing machine is used from the viewpoint of achieving both the solubility of the water-soluble bag (water-soluble laundry bag) and the washing property of the item to be washed. Although it is preferable to use, it is not limited to this.

  The specific configuration of the continuous washing machine is not particularly limited. For example, the washing machine includes a plurality of washing tanks, these washing tanks are arranged in a row, and the first washing process and the second washing process are performed for each washing tank. A rinsing process, a finishing process, etc. may be assigned. For example, if the continuous washing machine is configured to arrange 6 to 10 washing tanks in a row, the first washing process as the preliminary washing process is performed in the first to second tanks, and the second tank to Each process can be assigned so that the second cleaning process is performed as the main cleaning process in the seventh tank, the rinsing process is performed in the sixth to ninth tanks, and the finishing process is performed in the tenth tank.

  In addition, when the washing machine is a batch type washing machine, since there is only one washing tank, in this single washing tank, the first washing process is performed for a predetermined time, and then the washing liquid is added as necessary. What is necessary is just to perform a 2nd washing | cleaning process for predetermined time, draining etc., and also performing a rinse process and a finishing process after that.

  In addition, the washing method according to the present disclosure can be executed in a laundry facility including the washing machine described above. Examples of such laundry facilities include a configuration including a dehydrator, a dryer, and the like in addition to the washing machine, but are not particularly limited.

  As described above, the washing method according to the present disclosure includes the first washing step and the second washing step performed after the first washing step, and the washing object is stored in the water-soluble bag. A method for use in cleaning, wherein the pH of the cleaning liquid in the first cleaning step is in the range of 4.5 to 9, and the temperature of the cleaning liquid is in the range of 30 ° C. to 60 ° C. In this configuration, the temperature of the cleaning liquid is 60 ° C. or higher. Thereby, the water-soluble bag body which accommodates to-be-washed | cleaned material can be dissolved favorably in the washing | cleaning process. As a result, it is possible to effectively avoid the possibility that the undissolved residue of the water-soluble bag body adheres to the article to be washed and deteriorates the quality of washing (laundry) or causes trouble in the laundry facility.

  Although this invention is demonstrated more concretely based on an Example and a comparative example, this indication is not limited to this. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of the present disclosure. The objects to be washed in the following examples or comparative examples. The washing machine and the washing liquid described below were used, and the evaluation method was carried out as described below.

(Washable items)
As an object to be washed in Examples and Comparative Examples, a blood-contaminated cloth in which sheep blood (product name: sheep preservation solution, manufactured by Japan Lamb Co., Ltd.) was dropped onto a linen white cloth was used.

(Washing machine)
In Examples and Comparative Examples, Tokyo Washing Machine Co., Ltd., product name: GIIIBF8-L, which is a continuous washing machine, was used. This continuous washing machine includes one cleaning tank for performing the first cleaning process, three cleaning tanks for performing the second cleaning process, and eight cleaning tanks for performing the rinsing process.

(Cleaning solution)
As the cleaning liquid, a nonionic surfactant manufactured by Genbu Co., Ltd., trade name: Greenfield, or Genbu Co., Ltd., trade name: Super Fine Bio, a powder detergent containing water was used. For convenience of explanation, the cleaning liquid using the powder detergent containing Greenfield (trade name) is referred to as “cleaning liquid 1”, and the cleaning liquid using the powder detergent containing Super Fine Bio (trade name) is referred to as “cleaning liquid 2”. To do. The concentration of the powder detergent in the cleaning liquid 1 or the cleaning liquid 2 was 0.1% by mass.

(Solubility of water-soluble laundry bags)
The solubility of the water-soluble laundry bag (water-soluble bag) during the washing process was evaluated by visually confirming the washing tank in the continuous washing machine. “A” indicates that the water-soluble laundry bag is completely dissolved and no undissolved residue can be confirmed. “B” indicates that the water-soluble laundry bag is almost dissolved but a small amount of undissolved residue can be confirmed. The case where the laundry bag was not sufficiently dissolved and a large amount of undissolved residue could be confirmed was designated as “C”.

(Evaluation of washability of objects to be washed)
The object to be cleaned after the completion of cleaning was visually confirmed and evaluated. The case where no blood stain can be confirmed on the white linen cloth is set to “4”, the case where “light” blood stain is confirmed is set to “3”, and the case where “medium” blood stain is confirmed is “2”. “,” And “1” when a “dark” blood stain was confirmed.

Example 1
The cleaning liquid 1 was used as the cleaning liquid, and the product name: Aqua Film LBN-1 manufactured by Moraine Corporation was used as the water-soluble laundry bag (in Table 1, the water-soluble laundry bag i). The film thickness of the water-soluble laundry bag i is 22 μm.

  In this water-soluble laundry bag i, one piece of blood-contaminated cloth that is the object to be washed was stored and sealed, and was put into the above-described continuous washing machine to wash the object to be washed. As shown in Table 1, in the first cleaning step, the pH of the cleaning solution was adjusted to 5 using an aqueous citric acid solution, and the water temperature of the cleaning solution was adjusted to 40 ° C. In the second cleaning step, the pH of the cleaning solution was adjusted to 10 using an aqueous sodium hydroxide solution, and the water temperature of the cleaning solution was adjusted to 80 ° C. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Example 2)
As shown in Table 1, the article to be washed was washed in the same manner as in Example 1 except that in the first washing step, the pH of the washing solution was adjusted to 7 using an aqueous citric acid solution. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Example 3)
As shown in Table 1, the article to be washed was washed in the same manner as in Example 1 except that in the first washing step, the pH of the washing liquid was adjusted to 8 using an aqueous sodium hydroxide solution. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

Example 4
As shown in Table 1, the object to be washed was washed in the same manner as in Example 1 except that the temperature of the cleaning liquid was adjusted to 35 ° C. in the first cleaning step. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Example 5)
As shown in Table 1, the object to be washed was washed in the same manner as in Example 1 except that the temperature of the cleaning liquid was adjusted to 50 ° C. in the first cleaning step. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Example 6)
As shown in Table 1, the article to be washed was washed in the same manner as in Example 2 except that in the second washing step, the pH of the washing solution was adjusted to 7 using an aqueous citric acid solution. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Example 7)
As shown in Table 1, the object to be washed was washed in the same manner as in Example 2 except that the temperature of the cleaning liquid was adjusted to 65 ° C. in the second cleaning step. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Example 8)
As shown in Table 1, Example 2 and the object to be washed were used as the water-soluble laundry bag except that Aisero Co., Ltd. product name: Sol Bag 1000 was used (in Table 1, it is referred to as water-soluble laundry bag ii). Washed. The film thickness of the water-soluble laundry bag ii was measured and found to be 40 μm. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag ii after washing and the washability of the article to be washed.

Example 9
As shown in Table 1, a product name: Solbag 2000 manufactured by Aicello Co., Ltd. is used as a water-soluble laundry bag (in Table 1, water-soluble laundry bag iii), and the cleaning liquid 2 is used as a cleaning liquid. Example 2 and the item to be washed were washed. The film thickness of the water-soluble laundry bag iii was measured and found to be 40 μm. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag iii after washing and the washing property of the article to be washed.

(Comparative Example 1)
As shown in Table 1, the article to be washed was washed in the same manner as in Example 1 except that in the first washing step, the pH of the washing solution was adjusted to 11 using an aqueous sodium hydroxide solution. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Comparative Example 2)
As shown in Table 1, the object to be washed was washed in the same manner as in Example 1 except that the temperature of the cleaning liquid was adjusted to 70 ° C. in the first cleaning step. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Comparative Example 3)
As shown in Table 1, the object to be washed was washed in the same manner as in Example 1 except that the temperature of the cleaning liquid was adjusted to 55 ° C. in the second cleaning step. Table 1 shows the evaluation results of the solubility of the water-soluble laundry bag i after washing and the washability of the article to be washed.

(Contrast of Examples and Comparative Examples)
As is apparent from the results of Examples 1 to 9, it can be seen that the water-soluble laundry bag is completely dissolved in the washing process and no undissolved residue is generated in the washing method according to the present disclosure. Moreover, as is clear from the results of Examples 1 to 7 and the results of Examples 8 and 9, if the washing method according to the present disclosure, good solubility can be realized regardless of the type of the water-soluble laundry bag. I understand.

  On the other hand, from the result of Comparative Example 1, the pH of the aqueous solution in the first cleaning step is too higher than the range of the present disclosure, or from the result of Comparative Example 2, the liquid temperature of the aqueous solution in the first cleaning step is within the range of the present disclosure. If the temperature of the aqueous solution in the second cleaning step is too lower than the upper limit of the present disclosure, it can be seen that undissolved residue is generated in the water-soluble laundry bag.

  Moreover, from the results of Example 6, it can be seen that when the pH of the second washing step is low, the solubility of the water-soluble laundry bag is good, but the washability of the blood-contaminated cloth decreases. Similarly, from the results of Example 7, it can be seen that even when the water temperature in the second washing step is low, the solubility of the water-soluble laundry bag is good, but the washability of the blood-contaminated cloth is lowered. Therefore, in the present disclosure, in order to improve not only the solubility of the water-soluble laundry bag but also the washability of the washing object having body fluid stains, not only the first washing step but also the pH in the second washing step. It can be seen that it is preferable to adjust the water temperature to a suitable range.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely used not only in a washing method in which an object to be washed is stored in a water-soluble bag and washed as it is, but also in a field of a washing machine or selection equipment capable of realizing the washing method.

Claims (7)

A method for cleaning an object to be cleaned, including a first cleaning step and a second cleaning step performed after the first cleaning step,
The object to be washed is subjected to washing in a state of being stored in a water-soluble bag,
While the pH of the cleaning liquid in the first cleaning step is in the range of 4.5 to 9, the liquid temperature of the cleaning liquid is in the range of 30 ° C to 60 ° C,
The liquid temperature of the cleaning liquid in the second cleaning step is 60 ° C. or higher,
How to wash. The pH of the cleaning liquid in the second cleaning step is 8 or higher, and the liquid temperature is 70 ° C. or higher.
The washing method according to claim 1. The water-soluble bag body is water-soluble that dissolves at a water temperature of 80 ° C. or less,
The washing method according to claim 1 or 2. The water-soluble bag is composed of at least a water-soluble resin film,
The water-soluble resin film has a thickness of 500 μm or less,
The washing method according to any one of claims 1 to 3. The water-soluble resin film has a thickness in the range of 1 to 100 μm,
The washing method according to claim 4. In at least one of the first cleaning step and the second cleaning step, the pH of the cleaning liquid is adjusted by adding a pH adjusting agent,
The washing method according to any one of claims 1 to 5. The article to be washed is characterized in that at least a biological fluid derived from a living body is adhered as dirt.
The washing method according to any one of claims 1 to 6.