WO2012155976A1 - Cleaning method for machine dishwashing - Google Patents
Cleaning method for machine dishwashing Download PDFInfo
- Publication number
- WO2012155976A1 WO2012155976A1 PCT/EP2011/058147 EP2011058147W WO2012155976A1 WO 2012155976 A1 WO2012155976 A1 WO 2012155976A1 EP 2011058147 W EP2011058147 W EP 2011058147W WO 2012155976 A1 WO2012155976 A1 WO 2012155976A1
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- WO
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- Prior art keywords
- cleaning
- temperature
- cleaning solution
- process according
- preferred
- Prior art date
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004851 dishwashing Methods 0.000 title claims description 13
- 230000002378 acidificating effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 6
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 4
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 4
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000000174 gluconic acid Substances 0.000 description 2
- 235000012208 gluconic acid Nutrition 0.000 description 2
- 239000003752 hydrotrope Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 229940098779 methanesulfonic acid Drugs 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 239000008055 phosphate buffer solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical compound NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 2
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 235000006468 Thea sinensis Nutrition 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 235000020279 black tea Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- DUWWHGPELOTTOE-UHFFFAOYSA-N n-(5-chloro-2,4-dimethoxyphenyl)-3-oxobutanamide Chemical compound COC1=CC(OC)=C(NC(=O)CC(C)=O)C=C1Cl DUWWHGPELOTTOE-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/46—Devices for the automatic control of the different phases of cleaning ; Controlling devices
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
- A47L15/0007—Washing phases
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4236—Arrangements to sterilize or disinfect dishes or washing liquids
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L2601/00—Washing methods characterised by the use of a particular treatment
- A47L2601/20—Other treatments, e.g. dry cleaning
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/40—Specific cleaning or washing processes
- C11D2111/44—Multi-step processes
Definitions
- This invention relates generally to the field of machine dishwashing processes, e.g. for cleaning tableware or other surfaces soiled with food remains. More particular this invention relates to field of continuous or discontinuous machine dishwashing processes in single or multi-tank dish machines.
- a process for continuous or discontinuous machine dishwashing comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ⁇ 10,5 and ⁇ 13 at a temperature of ⁇ 30 and ⁇ 55°C. b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ⁇ 1 and ⁇ 3 at a temperature of ⁇ 50 and ⁇ 75°C. c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ⁇ 10,5 and ⁇ 13 at a temperature of ⁇ 30 and ⁇ 55°C.
- step a) and/or step c) is performed at a temperature of ⁇ 40 and ⁇ 50°C, preferably around 45°C.
- step b) and/or step d) is performed at a temperature of ⁇ 55 and ⁇ 70°C, preferably between ⁇ 60 and ⁇ 65°C and most preferred around 63°C.
- the cleaning solution has a pH of ⁇ 11 and ⁇ 12.
- the cleaning solution has a pH of ⁇ 2 and ⁇ 2,5.
- step a) is performed for ⁇ 10s and ⁇ 60s.
- step b) is performed for ⁇ 10s and ⁇ 20s.
- step c) is performed for ⁇ 20s and ⁇ 60s.
- step d) is performed for ⁇ 5s and ⁇ 15s.
- step d) is performed for ⁇ 5s and ⁇ 15s.
- Step a) is the first alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ⁇ 10,5 and ⁇ 13, preferably ⁇ 11 and ⁇ 12. This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
- the cleaning solution used in step a) may include one or more of the following ingredients:
- Step a) is performed at a temperature of ⁇ 30 and ⁇ 55°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step a) is performed at a temperature of ⁇ 40 and ⁇ 50°C, preferably around 45°C
- Step a) preferably is performed for ⁇ 10s and ⁇ 60s, more preferred for ⁇ 20s and ⁇ 30s.
- the duration of step a) is not limiting for the invention, only for some preferred applications within the same.
- Step b) is the acidic cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ⁇ 1 and ⁇ 3, preferably ⁇ 2 and ⁇ 2,5 This pH can be achieved e.g. by using an inorganic or organic acid .
- Suitable acidic compounds in the context of this invention which are insofar preferred are sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, propanoic acid, glycolic acid, citric acid, maleic acid, lactic acid, gluconic acid, alkanesulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof and, in a most particularly embodiment, from formic acid, glycolic acid, gluconic acid, amidosulfonic acid or the alkanesulfonic acids, more particularly methanesulfonic acid or mixtures thereof. Especially preferred is methanesulfonic acid.
- the cleaning solution used in step b) may include one or more of the following ingredients:
- the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) .
- the tableware is not intentionally sprayed during the contact time.
- the cleaning solution is sprayed onto the tableware as a fine, gentle mist-like liquid spray.
- the cleaning solution is applied to the tableware as foam.
- the cleaning solution is applied to the tableware in droplet form or by the Ecolab process known commercially as thin film cleaning (TFC) .
- TFC thin film cleaning
- Step b) is performed at a temperature of ⁇ 50 and ⁇ 75°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ⁇ 60 and ⁇ 65°C and most preferred around 63°C
- Step b) preferably is performed for ⁇ 10s and ⁇ 20s.
- the duration of step b) is not limiting for the invention, only for some preferred applications within the same.
- Step c) Second alkaline cleaning step
- Step c) is the second alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ⁇ 10,5 and ⁇ 13, preferably ⁇ 11 and ⁇ 12.
- This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
- the cleaning solution used in step a) may include one or more of the following ingredients:
- the cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
- Step c) is performed at a temperature of ⁇ 30 and ⁇ 55°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step c) is performed at a temperature of ⁇ 40 and ⁇ 50°C, preferably around 45°C
- Step c) preferably is performed for ⁇ 20s and ⁇ 60s, more preferred ⁇ 45s and ⁇ 55s.
- the duration of step c) is not limiting for the invention, only for some preferred applications within the same.
- Step d) Rinsing step
- Step d) is the neutral rinsing step in the context of the invention and is performed using a rinse aid solution having a pH of ⁇ 5 and ⁇ 7.
- the rinse aid solution used in step d) may include one or more of the following ingredients:
- the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) , as it step d) usually is the last step in the dishwashing cycle.
- the tableware is not intentionally sprayed during the contact time.
- Step d) is performed at a temperature of ⁇ 50 and ⁇ 75°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ⁇ 60 and ⁇ 65°C and most preferred around 63°C
- Step d) preferably is performed for ⁇ 5s and ⁇ 15s, preferably ⁇ 9s and ⁇ 12s.
- the duration of step d) is not limiting for the invention, only for some preferred applications within the same.
- Example I Cleaning of table cups and table plates in a MEIKO DV80.2 dishwashing machine sold by Meiko company, Offenburg, Germany .
- a ca. 6% aqueous composition containing corn starch was cooled to 75 °C after boiling and was applied to each cup with a brush in a quantity of ca. 4 ml.
- the cups thus treated were left to stand for at least 3 hours and then dried at ca. 100 °C for 16 hours.
- the cleaning tests were carried out in a Meiko DV80.2 hood-type dishwashing machine according to the following scheme : a) Cleaning for 25 seconds at a temperature of 45 °C with a 0.2% by weight aqueous solution of an alkaline detergent, the solution having a pH of 12. b) Cleaning for 5 seconds at a temperature of 63 °C with a 0.2% by weight aqueous solution of an acidic detergent, the solution having a pH of 2.5. c) Cleaning for 49 s seconds at a temperature of 45 °C with a 0.2% by weight aqueous solution of an alkaline detergent, the solution having a pH of 12. d) Rinsing for 12 seconds at a temperature of 63 °C with fresh water
- Example II is identical with Example I, only that an Electrolux “Clean and Green” WT65 dishwashing machine, sold by Electrolux company, Sweden was used.
Landscapes
- Detergent Compositions (AREA)
- Washing And Drying Of Tableware (AREA)
Abstract
The present invention relates to a process for cleaning tableware using temperatures lower than 80°C whilst maintaining high hygienic standards by using two alkaline and one acidic cleaning step.
Description
Cleaning method for machine dishwashing
Technical field of the invention
This invention relates generally to the field of machine dishwashing processes, e.g. for cleaning tableware or other surfaces soiled with food remains. More particular this invention relates to field of continuous or discontinuous machine dishwashing processes in single or multi-tank dish machines.
Background of the invention
In conventional dishwashing processes, may it be continuous or discontinuous, elevated temperatures are used which are commonly regarded as elementary, especially for satisfying the hygiene requirements in view of the microbiology. In Germany, the DIN 10510 (multi tank machine) and the DIN 10512 (single tank machine) advise a minimum temperature within the wash tank of 60 °C to 65°C when using detergents without disinfection components. For the final cleaning step a minimum temperature of 80°C to 85°C is recommended. The overall contact time of the dishes should not be shorter than 120 seconds (multi tank) or 90 sec (single tank) respectively.
One the other hand, dishwashing processes which require lower temperatures are advantageous for ecological as well as economical reasons. Furthermore the stress for the tableware or other goods to be cleaned decreases with the temperature which these goods are exposed.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a dishwashing process in which lower temperatures can be used while satisfying hygiene requirements.
This object is solved by a process according to Claim 1. Accordingly, a process for continuous or discontinuous machine dishwashing is provided, comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ≥10,5 and ≤13 at a temperature of ≥30 and ≤55°C. b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ≥1 and ≤3 at a temperature of ≥50 and <75°C. c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ≥10,5 and ≤13 at a temperature of ≥30 and ≤55°C. d) Applying a rinse step, whereby the cleaning solution has a pH of ≥5 and ≤7 at a temperature of ≥50 and ≤75°C.
Surprisingly it has been found that such a process has for a wide range of applications within the present invention at least one of the following advantages:
By using this process it is possible to reach a satisfying cleaning result as well as meeting hygienic standards while avoiding high temperatures (especially temperatures over 75°C).
By avoiding these high temperatures, a significant amount of energy can be saved
- Lower temperatures lead to a lower environmental footprint of the wastewater
According to a preferred embodiment of the invention, step a) and/or step c) is performed at a temperature of ≥40 and ≤50°C, preferably around 45°C.
According to a preferred embodiment of the invention, step b) and/or step d) is performed at a temperature of ≥55 and ≤70°C, preferably between ≥60 and ≤65°C and most preferred around 63°C.
According to a preferred embodiment of the invention in step a) and/or c) the cleaning solution has a pH of ≥11 and ≤12.
According to a preferred embodiment of the invention in step b) the cleaning solution has a pH of ≥2 and ≤2,5.
According to a preferred embodiment of the invention, step a) is performed for ≥10s and ≤60s.
According to a preferred embodiment of the invention, step b) is performed for ≥10s and ≤20s.
According to a preferred embodiment of the invention, step c) is performed for ≥20s and ≤60s.
According to a preferred embodiment of the invention, step d) is performed for ≥5s and ≤15s. In the following the four steps of the invention are described in more detail:
Step a) : First alkaline cleaning step Step a) is the first alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ≥10,5 and ≤13, preferably ≥11 and ≤12. This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
Furthermore the cleaning solution used in step a) may include one or more of the following ingredients:
- Complexing agents, Chelants, Builders
- Surfactants
- Corrosion inhibitors
- Processing additives
The cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
Step a) is performed at a temperature of ≥30 and ≤55°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step a) is performed at a temperature of ≥40 and ≤50°C, preferably around 45°C
Step a) preferably is performed for ≥10s and ≤60s, more preferred for ≥20s and ≤30s. However, it should be noted that the duration of step a) is not limiting for the invention, only for some preferred applications within the same.
Step b) : Acidic cleaning step Step b) is the acidic cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ≥1 and ≤3, preferably ≥2 and ≤2,5 This pH can be achieved e.g. by using an inorganic or organic acid .
Suitable acidic compounds in the context of this invention which are insofar preferred are sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, propanoic acid, glycolic acid, citric acid, maleic acid, lactic acid, gluconic acid, alkanesulfonic acid, amidosulfonic acid, succinic acid, glutaric acid, adipic acid, phosphonic acids, polyacrylic acids or mixtures thereof and, in a most particularly embodiment, from formic acid, glycolic acid, gluconic acid, amidosulfonic acid or the alkanesulfonic acids, more particularly methanesulfonic acid or mixtures thereof. Especially preferred is methanesulfonic acid.
Furthermore the cleaning solution used in step b) may include one or more of the following ingredients:
- Surfactants
- Hydrotropes
- Stabilizer
- Processing additives
In a preferred embodiment of the process according to the invention, the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) .
In another preferred embodiment, the tableware is not intentionally sprayed during the contact time.
Alternatively or additionally, the cleaning solution is sprayed onto the tableware as a fine, gentle mist-like liquid spray.
Alternatively or additionally, the cleaning solution is applied to the tableware as foam.
Alternatively or additionally, the cleaning solution is applied to the tableware in droplet form or by the Ecolab process known commercially as thin film cleaning (TFC) .
Step b) is performed at a temperature of ≥50 and ≤75°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred,
step b) is performed at a temperature of ≥60 and ≤65°C and most preferred around 63°C
Step b) preferably is performed for ≥10s and ≤20s. However, it should be noted that the duration of step b) is not limiting for the invention, only for some preferred applications within the same.
Step c) : Second alkaline cleaning step
Step c) is the second alkaline cleaning step in the context of the invention and is performed using a cleaning solution having a pH of ≥10,5 and ≤13, preferably ≥11 and ≤12. This pH can be achieved e.g. by using hydroxide solution and/or hydroxide/buffer solution, especially hydroxide/ phosphate buffer solution
Furthermore the cleaning solution used in step a) may include one or more of the following ingredients:
- Complexing agents, Chelants, Builders
- Surfactants
- Corrosion inhibitors
- Processing additives The cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain.
Step c) is performed at a temperature of ≥30 and ≤55°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred,
step c) is performed at a temperature of ≥40 and ≤50°C, preferably around 45°C
Step c) preferably is performed for ≥20s and ≤60s, more preferred ≥45s and ≤55s. However, it should be noted that the duration of step c) is not limiting for the invention, only for some preferred applications within the same. Step d) : Rinsing step
Step d) is the neutral rinsing step in the context of the invention and is performed using a rinse aid solution having a pH of ≥5 and ≤7.
The rinse aid solution used in step d) may include one or more of the following ingredients:
- Surfactants
- Organic and/or inorganic acids
- Auxiliaries
- Hydrotropes
- Processing additives
In a preferred embodiment of the process according to the invention, the cleaning solution is allowed to act on the tableware and the soil for a certain contact time (during which spraying stops) , as it step d) usually is the last step in the dishwashing cycle. In another preferred embodiment, the tableware is not intentionally sprayed during the contact time.
Step d) is performed at a temperature of ≥50 and ≤75°C, which means that the cleaning solution which is applied to the tableware has this temperature. More preferred, step b) is performed at a temperature of ≥60 and ≤65°C and most preferred around 63°C
Step d) preferably is performed for ≥5s and ≤15s, preferably ≥9s and ≤12s. However, it should be noted that the duration of step d) is not limiting for the invention, only for some preferred applications within the same.
The afore mentioned components, as well as the claimed components and the components to be used in accordance with the invention in the described embodiments, are not subject to any special exceptions with respect to their size, shape, material selection and technical concept such that the selection criteria known in the pursuant field can be applied without a limitation.
BRIEF DESCRIPTION OF THE EXAMPLES
Additional details, features, characteristics and advantages of the object of the invention are disclosed in the following description of the examples, which - in exemplary fashion - show several embodiments and examples of a process according to the invention. The examples are to be understood merely to further illustrate the invention and are not binding.
Example I
Cleaning of table cups and table plates in a MEIKO DV80.2 dishwashing machine sold by Meiko company, Offenburg, Germany .
For each test, 3 dry, clean table cups were soiled by being dipped in a coffee and milk brew at 70°C for 25 times (1 min in the solution followed by 1 min drying each dipping cycle) and afterwards dried for 2 hours at 90°C according to a standardized test protocol.
Furthermore for each test 3 dry, clean table cups were dipped in a black tea and milk brew at 70°C for 25 times (1 min in the solution followed by 1 min drying each dipping cycle) and afterwards dried for 2 hours at 90°C according to a standardized test protocol.
Finally for each test three plates soiled with starch at room temperature by a standardized test method.
To this end, a ca. 6% aqueous composition containing corn starch was cooled to 75 °C after boiling and was applied to each cup with a brush in a quantity of ca. 4 ml. The cups thus treated were left to stand for at least 3 hours and then dried at ca. 100 °C for 16 hours.
The cleaning tests were carried out in a Meiko DV80.2 hood-type dishwashing machine according to the following scheme : a) Cleaning for 25 seconds at a temperature of 45 °C with a 0.2% by weight aqueous solution of an alkaline detergent, the solution having a pH of 12.
b) Cleaning for 5 seconds at a temperature of 63 °C with a 0.2% by weight aqueous solution of an acidic detergent, the solution having a pH of 2.5. c) Cleaning for 49 s seconds at a temperature of 45 °C with a 0.2% by weight aqueous solution of an alkaline detergent, the solution having a pH of 12. d) Rinsing for 12 seconds at a temperature of 63 °C with fresh water
The cleaning was evaluated by scoring on a scale of 1 (= no visible sign of cleaning) to 10 (= complete removal of soil), resulting in a score of 8.
EXAMPLE II
Example II is identical with Example I, only that an Electrolux "Clean and Green" WT65 dishwashing machine, sold by Electrolux company, Stockholm, Sweden was used.
The cleaning resulted in a score of 9.
The particular combinations of elements and features in the above detailed embodiments are exemplary only; the interchanging and substitution of these teachings with other teachings in this and the patents/applications incorporate by referency are also expressly contemplated. As those skilled in the art will recognize, variations, modifications, and other implementations of what is described herein can occur to those of ordinary skill in the art without departing from the spirit and the scope
of the invention as claimed. Accordingly, the foregoing description is by the way of example only and is not intending as limiting. In the claims, the wording "comprising" does not exclude other elements or steps, and the identified article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures can not be used to advantage. The inventions scope is defined in the following claims and the equivalents thereto. Furthermore, reference signs used in the description and claims do not limit the scope of the invention as claimed .
Claims
1.
A process for continuous or discontinuous machine dishwashing comprising the steps of a) Applying a first basic cleaning step whereby the cleaning solution has a pH of ≥10,5 and ≤13 at a temperature of ≥30 and ≤55°C. b) Applying an acidic cleaning step whereby the cleaning solution has a pH of ≥1 and ≤3 at a temperature of ≥50 and <75°C. c) Applying a second basic cleaning step whereby the cleaning solution has a pH of ≥10,5 and ≤13 at a temperature of ≥30 and ≤55°C. d) Applying a rinse step, whereby the cleaning solution has a pH of ≥5 and ≤7 at a temperature of ≥50 and ≤75°C.
2.
The process according to claim 1, whereby step a) and/or step c) is performed at a temperature of ≥40 and ≤50°C, preferably around 45°C.
3.
The process according to any of the claims 1 and 2, wherein step b) and/or step d) is performed at a temperature of ≥55 and ≤70°C, preferably between ≥60 and ≤65°C and most preferred around 63°C.
4.
The process according to any of the claims 1 to 3, wherein in step a) and/or c) the cleaning solution has a pH of >11 and <12.
5.
The process according to any of the claims 1 to 4, wherein in step b) the cleaning solution has a pH of ≥2 and ≤2 , 5.
6.
The process according to any of the claims 1 to 5, wherein step a) is performed for ≥10s and ≤30s
7.
The process according to any of the claims 1 to 6, wherein step b) is performed for ≥10s and ≤20s.
8.
The process according to any of the claims 1 to 7, wherein step c) is performed for ≥20s and ≤50s
9.
The process according to any of the claims 1 to 8, wherein step d) is performed for ≥5s and ≤15s
10.
The process according to any of the claims 1 to 9, whereby in step a) the cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain
11.
The process according to any of the claims 1 to 10, whereby in step c) the cleaning solution is sprayed onto the tableware trough a rotating washing arm as a heavy water curtain
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201180070958.2A CN103547203B (en) | 2011-05-19 | 2011-05-19 | The clean method of machine cleaning tableware |
| PCT/EP2011/058147 WO2012155976A1 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
| US14/118,706 US20140076364A1 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
| AU2011368660A AU2011368660B2 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
| KR1020137033690A KR20140035413A (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
| CA2831444A CA2831444A1 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
| JP2014510670A JP2014513624A (en) | 2011-05-19 | 2011-05-19 | Cleaning method for automatic dishwashing |
| EP11720120.2A EP2709508A1 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
| BR112013027407A BR112013027407A2 (en) | 2011-05-19 | 2011-05-19 | dishwasher cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2011/058147 WO2012155976A1 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012155976A1 true WO2012155976A1 (en) | 2012-11-22 |
Family
ID=44119132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2011/058147 WO2012155976A1 (en) | 2011-05-19 | 2011-05-19 | Cleaning method for machine dishwashing |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20140076364A1 (en) |
| EP (1) | EP2709508A1 (en) |
| JP (1) | JP2014513624A (en) |
| KR (1) | KR20140035413A (en) |
| CN (1) | CN103547203B (en) |
| AU (1) | AU2011368660B2 (en) |
| BR (1) | BR112013027407A2 (en) |
| CA (1) | CA2831444A1 (en) |
| WO (1) | WO2012155976A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0761156A1 (en) * | 1995-09-06 | 1997-03-12 | Sharp Kabushiki Kaisha | Dishwasher |
| EP1477552A1 (en) * | 2003-05-13 | 2004-11-17 | Ecolab Inc. | Method for cleaning articles in a dish washing machine |
| WO2005068598A1 (en) * | 2003-12-18 | 2005-07-28 | Ecolab Inc. | Methods and compositions for the removal of starch |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3600602A (en) * | 1969-10-13 | 1971-08-17 | Gen Electric | Control arrangement for a washing machine |
| US4730630A (en) * | 1986-10-27 | 1988-03-15 | White Consolidated Industries, Inc. | Dishwasher with power filtered rinse |
| US5186912A (en) * | 1991-01-03 | 1993-02-16 | Ecolab, Inc. | Controlled release dishwasher detergent dispenser |
| DE19537669A1 (en) * | 1995-10-10 | 1997-04-17 | Aeg Hausgeraete Gmbh | Dishwashing machine controlled by pH value |
| DE10127919A1 (en) * | 2001-06-08 | 2002-12-19 | Ecolab Gmbh & Co Ohg | Washing processes, for removing mineral or starch deposits in industrial or domestic dishwashers is effected with both alkaline and acidic stages |
| JP2003135361A (en) * | 2001-10-31 | 2003-05-13 | Sanyo Electric Co Ltd | Dishwasher |
| US8092613B2 (en) * | 2002-05-31 | 2012-01-10 | Ecolab Usa Inc. | Methods and compositions for the removal of starch |
| DE10238303A1 (en) * | 2002-08-21 | 2004-03-04 | BSH Bosch und Siemens Hausgeräte GmbH | Method for adapting a washing program in a dishwasher and dishwasher |
| DE10358969A1 (en) * | 2003-12-16 | 2005-07-21 | BSH Bosch und Siemens Hausgeräte GmbH | Dishwasher with a metering device for aggregate and associated method |
| KR101054134B1 (en) * | 2004-05-20 | 2011-08-03 | 엘지전자 주식회사 | Door locks in the dishwasher |
| DE102005004089A1 (en) * | 2004-12-09 | 2006-06-14 | BSH Bosch und Siemens Hausgeräte GmbH | Dishwasher with a Sorptionstrockenvorrichtung and method for operating the same |
| DE102005062481A1 (en) * | 2005-12-27 | 2007-07-05 | BSH Bosch und Siemens Hausgeräte GmbH | Domestic dishwasher has fast setting which allows intensive, delicate, automatic and normal washing cycles to be carried out in shorter time, e.g. by increasing force with which rinsing water is sprayed on to dishes |
| KR101455986B1 (en) * | 2007-12-10 | 2014-11-03 | 엘지전자 주식회사 | Dish washer and method for controlling thereof |
| DE102008006352A1 (en) * | 2008-01-28 | 2009-07-30 | BSH Bosch und Siemens Hausgeräte GmbH | dishwasher |
| CN102196758B (en) * | 2008-10-27 | 2014-09-03 | 阿塞里克股份有限公司 | Dishwasher using ozone water |
-
2011
- 2011-05-19 US US14/118,706 patent/US20140076364A1/en not_active Abandoned
- 2011-05-19 AU AU2011368660A patent/AU2011368660B2/en active Active
- 2011-05-19 WO PCT/EP2011/058147 patent/WO2012155976A1/en active Application Filing
- 2011-05-19 JP JP2014510670A patent/JP2014513624A/en active Pending
- 2011-05-19 KR KR1020137033690A patent/KR20140035413A/en not_active Application Discontinuation
- 2011-05-19 EP EP11720120.2A patent/EP2709508A1/en not_active Withdrawn
- 2011-05-19 CA CA2831444A patent/CA2831444A1/en not_active Abandoned
- 2011-05-19 CN CN201180070958.2A patent/CN103547203B/en active Active
- 2011-05-19 BR BR112013027407A patent/BR112013027407A2/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0761156A1 (en) * | 1995-09-06 | 1997-03-12 | Sharp Kabushiki Kaisha | Dishwasher |
| EP1477552A1 (en) * | 2003-05-13 | 2004-11-17 | Ecolab Inc. | Method for cleaning articles in a dish washing machine |
| WO2005068598A1 (en) * | 2003-12-18 | 2005-07-28 | Ecolab Inc. | Methods and compositions for the removal of starch |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014513624A (en) | 2014-06-05 |
| CA2831444A1 (en) | 2012-11-22 |
| AU2011368660A1 (en) | 2013-10-17 |
| EP2709508A1 (en) | 2014-03-26 |
| BR112013027407A2 (en) | 2017-01-17 |
| CN103547203B (en) | 2016-03-30 |
| US20140076364A1 (en) | 2014-03-20 |
| CN103547203A (en) | 2014-01-29 |
| KR20140035413A (en) | 2014-03-21 |
| AU2011368660B2 (en) | 2016-09-08 |
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