JPS6054358B2 - How to wash tableware using an automatic dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cleaning tableware using an automatic dishwasher, and more specifically to a method for cleaning dirty tableware in two stages using two different types of cleaning agents. It depends.

Known detergents for automatic dishwashers include alkaline detergents containing alkaline salts as their main ingredients and neutral to weakly alkaline detergents containing enzymes (amylase, protease, lipase, etc.). In the conventional washing method using a machine, it is customary to wash dirty tableware using one of the above-mentioned detergents, rinse it, and then dry it.

However, when glass tableware is washed using this method, there is a drawback that so-called water spots remain on the washed tableware. When water with relatively high hardness is used as the cleaning water, water spots remain particularly noticeable. For this reason, conventionally, rinsing agents are used after washing to eliminate water spots, but the rinsing agents foam relatively significantly, which not only significantly reduces the water jetting power of automatic dishwashers. This seems to be caused by the nonionic activator in the rinsed tableware. It has the disadvantage of causing haze. As a result of repeated research aimed at eliminating water spots, the inventors of the present invention found that conventional cleaning methods have problems with the cleaning agent itself and its usage method, and it is necessary to identify two specific types of cleaning agents as described below. It has been found that if used in this order, tableware can be washed without leaving any water spots, not only when using low hardness water, but also when using high hardness water, for example.

Therefore, in the method of washing tableware using an automatic dishwasher according to the present invention, dirty tableware is first washed with a neutral to weakly alkaline detergent shown in (4) below, and then the tableware is washed as shown in (B) below. It is characterized by a two-stage cleaning method consisting of cleaning with an alkaline cleaning agent.

(4) Neutral to weakly alkaline cleaning agent Ethylene oxide and propylene oxide adducts of linear or branched alcohols of C4 to Cl8, C8 to Cl8
Ethylene oxide and propylene oxide adducts of alkylphenols, ethylene oxide and propylene oxide adducts of ethylenediamine, and Pluronic type activators (all of the above four activators have an average number of added moles of ethylene oxide in the range of 0 to 50). can be,
0.5 to 10%, preferably 1 to 6%, of one or more nonionic surfactants selected from the group consisting of:
% amylase and/or protease.
A cleaning agent containing 0%.

(B) Alkaline detergent - ethylene oxide and propylene oxide adduct of C4-Cl8 linear or branched alcohol, C8-Cl8
Ethylene oxide and propylene oxide adducts of alkylphenols, ethylene oxide and propylene oxide adducts of ethylenediamine, and Pluronic type activators (all of the above four types of activators have an average number of added moles of ethylene oxide in the range of 0 to 50). can be,
0.5 to 10%, preferably 1 to 6%, of one or more nonionic surfactants selected from the group consisting of 3 to 100 moles of propylene oxide added on average.
%, and contains 20 to 95% of one or more builders selected from the group consisting of sodium orthosilicate, sodium metasilicate, and trisodium phosphate.

If necessary, neutral salts such as sodium sulfate and sodium chloride can be added to the neutral to weakly alkaline cleaning agent (4), as well as condensed phosphates such as sodium tripolyphosphate and sodium pyrophosphate, and citrate. , builders such as gluconate, reducing agents such as sodium thiosulfate, thiourea, and hydroxyamine hydrochloride, emulsifiers such as sorbitan, and antifoaming or antifoaming agents such as silicone, etc., are also added as necessary. be able to. Similarly, to the above alkaline cleaning agent (B), neutral salts such as sodium sulfate and sodium chloride can be added as needed, as well as condensed phosphates such as sodium tripolyphosphate and sodium pyrophosphate, and alkali metal carbonates. , citrates, gluconates, etc., oxygen bleaches such as sodium percarbonate and sodium perborate, and chlorine bleaches such as dichloroisocyanurate may be added as necessary. I can do it. As is clear from the above, the basic feature of the present invention is that the above-described neutral to weakly alkaline cleaning agent (4) is used in the first stage of the cleaning process, and the above-mentioned alkaline cleaning agent (4) is used in the latter stage of the cleaning process. B).

Generally, the washing time in an automatic dishwasher is about 30 to 4 times, so the first 15 to 20 minutes are spent using the detergent (
In a typical embodiment of the present invention, the powder is washed with step 4), and the latter half of the powder is washed with washing agent (B). After washing the tableware with detergent (4), immediately wash it with detergent (B).
Can be washed with. After cleaning with the cleaning agent (B), the tableware is rinsed with water and dried as usual. Note that tableware as used in the present invention includes all items that are to be washed in an automatic dishwasher. As explained above, the cleaning method of the present invention uses two types of cleaning agents specific to automatic dishwashers in a specific order, so it can be used not only when the cleaning water is of low hardness but also when high hardness is used. In some cases, tableware can be cleaned without leaving water spots.

The present invention will now be described in more detail with reference to Examples. Prior to that, the cleaning conditions, cleaning procedures, and water spot evaluation methods employed in each Example are shown below.

Washing conditions Washing machine used: Fully automatic dishwasher (cleaning agent solution is
Cleaning temperature: The temperature gradually increases from 25°C to 50°C.

Cleaning water: Hardness 3 or DH or 100DH Water Cleaning time:
4 Powder cleaning procedure 1: After washing with detergent (4), immediately wash with detergent (B), rinse with water, and dry.

Part 2: After cleaning with cleaning agent (B), immediately rinse with cleaning agent.
Clean, rinse with water and dry.

Part 3: Cleaning agent or one or both of (B)
Clean with a mixture of people, rinse with water and dry.

Water spot evaluation method Clean glass plate (5cm x
) Wash the three sheets in the fully automatic dishwasher, rinse with water, dry, and count the number of water spots.

Example 1 Clean glass was cleaned using a cleaning agent having the composition shown below under the cleaning conditions and procedures described above, and the number of residual water spots was measured.

The results are shown in Table 1. Cleaning agent (4) PO and EO adduct of butanol 3Wt% (average number of moles added is PO=
20,E0=5) amylase
Kid% Protease 2W'
t% Sodium thiosulfate 0.5Wt% Sodium sulfate 91.5Wt% (4
) PO and EO represent propylene oxide and ethylene oxide, respectively (the same applies hereinafter).

Cleaning agent (B) PO and EO adducts of butanol
2Wt% (average number of moles added: PO=20, E0=5) Sodium orthosilicate 50Wt% Sodium carbonate 48Wt% As is clear from the results shown in Table 1, Experiment No. 1 according to the present invention. l~NO.
In Experiment No. 2, the number of water spots remaining on the glass surface was small, whereas in Experiment No. 2, the cleaning method (cleaning procedure) was different from that of the invention even though the cleaning agent of the present invention was used. 3~NO. l
With O, the number of residual water spots is extremely large, and this tendency is particularly noticeable when the hardness of the water is high.

Example 2 A cleaning test similar to Example 1 was conducted using a cleaning agent having the following composition.

The results are shown in Table 2. Cleaning agent (4) PO and EO adduct of butanol 3wt% (average number of added moles is PO=
20,E0=5) Sodium tripolyphosphate (S'n)P
) or sodium pyrophosphate ('ISPP) 20wt%
Amylase % protease 2wt% sodium thiosulfate 0.5wt% sodium sulfate
71.5Wt96 detergent (B) PO and EOfJ' addition of butanol 2Wt% (average number of moles added: PO=20, E0=5) Sodium orthosilicate
40wt% trisodium phosphate
20wt% sodium carbonate
38wt% From the results shown in Table 2, the same results as in Example 1 can be derived.

Example 3 A cleaning test was conducted according to cleaning procedure No. 1 using cleaning agents with different compositions.

Table 3 shows the composition of the cleaning agent used and the test results. As shown in Table 3, when cleaning is performed according to the method (cleaning procedure) of the present invention using the cleaning agents CA) and (B) of the present invention, almost no water spots remain.

Claims (1)

[Claims] 1. In a method for washing dirty tableware in an automatic dishwasher, the tableware is first washed with a neutral to weakly alkaline detergent shown in (A) below, and then washed with a neutral to weakly alkaline detergent shown in (A) below. A method for washing tableware using an automatic dishwasher, characterized by washing with an alkaline detergent shown in (B). (A) Ethylene oxide and propylene oxide adducts of linear or branched alcohols of neutral to weakly alkaline detergents C_4 to C_1_8, C_8
~ C_1_8 alkylphenol ethylene oxide and propylene oxide adducts, ethylene diamine ethylene oxide and propylene oxide adducts, and Pluronic type activators (all of the above four types of activators have an average number of added moles of ethylene oxide in the range of 0 to 50) , and the average number of moles of propylene oxide added is 3.
-100) containing 0.5 to 10% of one or more nonionic activators selected from the group consisting of
A cleaning agent containing 1 to 40% amylase and/or protease. (B) Ethylene oxide and propylene oxide adducts of linear or branched alcohols of alkaline detergents C_4 to C_1_8, C_8
~ C_1_8 alkylphenol ethylene oxide and propylene oxide adducts, ethylene diamine ethylene oxide and propylene oxide adducts, and Pluronic type activators (all of the above four types of activators have an average number of added moles of ethylene oxide in the range of 0 to 50) , and the average number of moles of propylene oxide added is 3.
-100) containing 0.5 to 10% of one or more nonionic activators selected from the group consisting of
A cleaning agent containing 20 to 95% of one or two types of builders selected from the group consisting of sodium orthosilicate, sodium metasilicate, and trisodium phosphate.