JPH02198595A - Sterilizing method for washing machine and tick killing method and washing machine with sterilizing and tick killing function - Google Patents

Abstract

PURPOSE:To enable sterilizing and tick killing to be executed at the time of washing by using a water feeding means and a heat feeding means to heat an object to washed in a washing tank under the existence of free water, and by setting its heating temperature and the keeping time of the heating temperature to satisfy specific conditions. CONSTITUTION:A washing tank 3 for containing and washing clothing, a pulsator 4 for applying a mechanical cleaning force, a heat feeding means 5, and a water feeding means 6 are arranged. Then, by both means 5, 6, to an object to be washed in the washing tank 3, water and heat are fed and moisture and heat conditions are applied for sterilizing. When a heating temperature at the time of this moisture and heat is set as T deg.C, and the keeping time of the heating temperature is set as t minutes, then the moisture and heat conditions are set as T>45 deg.C and (-8.08X10<-3>T+0.351)t<-5.60. As a result, in good heat efficiency, sterilizing and tick killing can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for sterilizing and killing mites in washing machines, and a washing machine with sterilizing and mite killing functions.

BACKGROUND OF THE INVENTION Bacteria are microorganisms that usually live in single cells. Among these bacteria, there are some that adhere to clothing and exhibit harmful effects as bacteria that cause fiber deterioration and infectious diseases. . House mites are minute animals that live in living environments, and are known to exist in large numbers in bedding such as blankets and sheets. Among these are:
Some allergens have harmful effects on the human body.

Next, FIG. 4 shows the configuration of a conventional washing machine. In the figure, 1 is a washing tub that stores laundry and stores water for washing, and 2 is a pulsator that agitates the inside of the washing tub 1 and provides mechanical cleaning power. Also, for normal washing, put the laundry into washing tub 1,
Water supply and detergent are added to the washing W11, and agitation washing by operating the pulsator 2 is performed in this order.

Problems to be Solved by the Invention Now, when laundry such as clothes and bedding is washed in a washing machine with the conventional configuration as described above, the bacteria and house mites mentioned above are not removed and remain even after washing. It can be said that it is unsanitary.

The present invention solves these problems, and the first purpose is to provide a sterilization method during washing, the second purpose is to provide a miticide method, and the third purpose is to provide a miticide method. The purpose of the present invention is to provide a washing machine that can efficiently perform sterilization and miticide II/Ga.

Means for Solving the Problem The means for achieving the first objective is to heat the laundry in the washing tub in the presence of free water using a water supply means and a heat supply means, and to increase the heating temperature to T. ℃, holding time of heating temperature is t minutes, T>45℃, (-8,08×1O-3T+0.351)
It is set to satisfy t<-5,60.

The means for achieving the second objective is to heat the laundry in the washing tub in the presence of free water using a water supply means and a heat supply means, and set the heating temperature to 50°C or higher. This is what I did.

The means for achieving the third objective is to install a steam generation means or hot water supply means that supplies steam to the washing tub, and to start the operation of the steam generation means or hot water supply means after the laundry is stored. This is done before water is supplied to the washing tub.

It is supplied with moisture and heat, and can be sufficiently sterilized during the washing process.

According to the second method, moisture and heat are supplied to the laundry to create a moist heat state, and mites can be instantly killed during the washing process.

According to the third means, since heat is supplied to dry laundry, the amount of water contained in the laundry is reduced compared to when heat is supplied during washing or in a wet state after washing. It requires less heat to raise the temperature of the water, which improves thermal efficiency.It can create a moist heat state where moisture and heat are supplied to the laundry, making it possible to sterilize and kill mites.

Embodiment An embodiment of the present invention will be described based on FIG. In the figure, 3 is a washing tub for storing and washing clothes, and 4 is a pulsator that provides mechanical cleaning power. 5 is a heat supply means;
6 is a water supply means.

Both means 5 and 6 supply water and heat to the laundry stored in the washing tub 3 to provide moist heat conditions and sterilize the laundry. In this embodiment, the heating temperature during this moist heat is set as the holding time of T° C. heating temperature for t minutes, and the moist heat conditions are set as shown below.

T>45℃, (-8,08×lOT+0.351)
t<-5,60 Next, an experimental example will be described. First, the sterilizing ability required of a clothes dryer is as follows. 24 types of used textile products in general households, mainly clothing, 120
The number of attached bacteria was analyzed for each point. Analyzing the distribution of the number of attached bacteria according to the lognormal distribution, the average planting = 5.1XIO'' cells 7g cloth, and the average value of the logarithm is log father = 2.708 Standard deviation of the lognormal distribution σ =
2.066, and if we consider the normal value range of the distribution to be ±2σ, the amount of bacteria adhering to clothes etc. at home is 6.9X at maximum.
106 cells/g.

Next, we analyzed the bacterial survival rate after washing and dehydration using an electric washing machine commonly used in households and commercially available household detergents. The results are: n=24, X=8.9xlO-',
1 og = -3,051, cr = 0.907, and if we also consider the range of ±2σ, the maximum survival rate is 5.8 x 10-'. Therefore, at most,
6.9 x 106 cells/g X5,8xlO-2=
It is believed that 4.0xlO' cells/g of bacteria remain after washing in a normal household. In other words, if a sterilization method that provides a survival rate of less than l÷(4,0x10') = 2.5xlO-6 is used during the washing process, the number of remaining bacteria can be reduced to 0. It can be said that sufficient sterilization ability can be obtained.

Next, we will discuss the relationship between temperature time during heating under humid conditions (moist heat) and bacterial survival rate. The bacteria used in this experiment is a strain of Gram-positive cocci. This strain was isolated and cultured from common bacteria, excluding spore-forming bacteria that usually adhere to household clothing, and was isolated as the most heat-resistant bacteria out of all the bacteria. Now, Figure 2 shows the relationship between humidity, heat, temperature, time and survival rate in Japan. The figure shows that under a temperature condition of 45℃ or higher, logR=
(-8,08xlOT+0.351) The relationship of t is satisfied. Here, R is the survival rate in the home country, T is the hygrothermal temperature ('
C), t is the moist heat time (minutes). As mentioned above, the sterilizing means applied to the washing machine is required to have a survival rate of 2.5·1 O-6 or less.

Therefore, logR is -5,60= l o g (2,5
xlO-6) or less, the home country can be sufficiently sterilized.

Therefore, in the present invention, for the purpose of sterilization, (-8,08X1
0-37+0.351) Water and heat are supplied to raise the temperature of the laundry so that t<-5.60.

Next, a second embodiment of the present invention will be described. The configuration used for this purpose is the same as that of the first embodiment, in which water and heat are supplied to the laundry stored inside to provide moist heat conditions to kill mites. For house dust mites, blankets can contain up to 10
Occasionally, populations on the order of individuals/g are observed. If this is placed in a moist heat state, it will die almost instantly at 50°C.

Therefore, in this embodiment, in order to achieve the purpose of killing mites, water and heat are supplied to raise the temperature of the laundry to 50° C. or higher.

A third embodiment of the present invention will be described with reference to FIG. In the figure, 7 is a washing tub that stores and washes laundry, 8 is a pulsator that stirs the inside of the washing tub 7 and provides mechanical cleaning power, and 9
is a steam generating means or a hot water supply means, and the steam or hot water is supplied toward the inside of the wash nA, tff7. Further, the timing for supplying steam or hot water by the steam generating means or the hot water supply means is after the clothes are put into the washing tub 7 and before the water is supplied.

With the above configuration, the laundry is brought into a moist heat state and can be sterilized and killed by mites. Also, in order to apply steam to dry laundry, compared to applying steam to wet laundry, heat is taken away by the rising temperature of the water contained in the laundry. (, therefore, it has good heat efficiency.

Effects of the Invention As described above, the present invention heats laundry in a washing tub in the presence of free water using a water supply means and a heat supply means, and achieves temperature and time conditions suitable for sterilization. , sufficient sterilization can be performed during the washing process, and by realizing temperature conditions suitable for killing mites, mites can be killed instantly during the washing process. Furthermore, a steam generation means or hot water supply means is installed to supply steam to the washing tub, and the steam generation means or hot water supply means is operated between after the laundry is stored and before water is supplied to the washing tub. With this configuration, it is possible to provide a sanitary washing machine that can sterilize and kill mites with thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a washing machine according to an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between bacterial survival rate and moist heat temperature time, and Fig. 3 is a diagram showing a relationship between the survival rate of bacteria and the temperature time of moist heat. FIG. 4 is a schematic sectional view of a conventional washing machine. 3... Washing tub, 5... Heat supply means, 6... Water supply means, 7... Washing tub, 9... Steam supply means or hot water supply means. Name of agent: Patent attorney Shigetaka Awano and one other person---y
ld, common) and) + sai ( ward - is ÷ mate

Claims (3)

[Claims] (1) It has a water supply means, a heat supply means, and a washing tub for storing and washing laundry, and uses the water supply means and heat supply means to heat the laundry in the washing tub in the presence of free water. The heating temperature is T°C, the heating temperature holding time is t minutes, and T>4.
5℃, (-8.08×10T^-^3+0.351)t
A washing machine sterilization method that satisfies <-5.60. (2) It has a water supply means, a heat supply means, and a washing tub for storing and washing laundry, and uses the water supply means and heat supply means to heat the laundry in the washing tub in the presence of free water. A method for killing mites in washing machines by setting the heating temperature to 50°C or higher. (3) A washing tub for storing and washing laundry, and a steam generating means or hot water supplying means for supplying steam to the washing tub, and the operation of the steam generating means or hot water supplying means is controlled by the washing machine. A washing machine with a sterilization and mite killing function that performs the process after storage and before water is supplied to the washing tub.