Hair treatment system

Abstract

System for treating a head of hair, including a pipe for circulating a liquid, a device for feeding the pipe with water, at least one source of product, the product (P1) comprising one or more surfactants, a device for injecting product into the pipe to form a treatment solution comprising one or more surfactants in a content ranging from 0.35% to 1.5% by weight of surfactant(s) relative to the total weight of the treatment solution, a dispensing device for delivering the treatment solution onto the head of hair (B) with a flow rate of between 0.5 and 5 L/min, better still between 0.8 and 3 L/min.

Claims

1. A hair treatment system, comprising: a pipe for circulating a liquid, a device for feeding the pipe with water, at least one source of product, the product comprising one or more surfactants, a device for injecting product into the pipe to form a treatment solution comprising one or more surfactants in a content ranging from 0.35% to 1.5% by weight of surfactant(s) relative to the total weight of the treatment solution, and a dispensing device for delivering the treatment solution onto the head of hair with a flow rate of between 0.5 and 5 L/min, the dispensing device being a shower head connected to a flexible hose, and the dispensing device comprising nozzles arranged so as to cause two jets leaving the dispensing device to collide before contacting a user while the dispensing device is in use.

2. The hair treatment system according to claim 1, wherein the surfactant(s) are present in the treatment solution in an amount ranging from 0.6% to 1.2% by weight relative to the total weight of the treatment solution.

3. The hair treatment system according to claim 1, wherein the water hardness being less than or equal to 45° f.

4. The hair treatment system according to claim 1, wherein the surfactant(s) are chosen from anionic surfactants, amphoteric surfactants, nonionic surfactants and mixtures thereof.

5. The hair treatment system according to claim 1, wherein the treatment solution comprising one or more anionic surfactants in a content ranging from 0.25% to 1% by weight relative to the total weight of the treatment solution.

6. The hair treatment system according to claim 1, wherein the product injection device injecting between 2.5 g/minute and 20 g/minute of anionic surfactants into the pipe.

7. The hair treatment system according to claim 1, further comprising a pressure booster to increase the pressure of the water entering the dispensing device above the pressure of the water entering the system.

8. The hair treatment system according to claim 1, further comprising a member for controlling the amount of water dispensed, and/or the amount of product injected into the water and/or the flow rate of liquid delivered by the dispensing device.

9. The hair treatment system according to claim 1, further comprising a user interface for selecting a setting, the hair treatment system being configured to act on an adjustment device for varying the content of product as a function of the selected setting, and/or to input at least one item of information relating to a treatment result obtained with the selected setting.

10. The hair treatment according to claim 1, further comprising a means for memorizing at least one setting by associating it with a person and/or a person's identification code.

11. A washing system comprising: a pipe for circulating a liquid, a device for feeding the pipe with water, at least one source of product, the product comprising one or more surfactants, a device for injecting product into the pipe to form a treatment solution comprising one or more surfactants in a content ranging from 0.35% to 1.5% by weight relative to the total weight of the treatment solution, and a dispensing device for delivering the treatment solution with a flow rate of between 0.5 and 5 L/min, the dispensing device being a shower head connected to a flexible hose, and the dispensing device comprising nozzles arranged so as to cause two jets leaving the dispensing device to collide before contacting a user while the dispensing device is in use.

12. A washing process, comprising the treatment step consisting in spraying the head of hair with a treatment solution comprising water and one or more surfactants at a flow rate of between 0.5 and 5 L/minute, the treatment solution comprising one or more surfactants in a content ranging from 0.35% to 1.5% by weight of surfactant(s) relative to the total weight of the treatment solution, wherein the process is performed using the system according to claim 1.

13. The washing process according to claim 12, wherein the treatment step lasts between 1 and 30 seconds.

14. The washing process according to claim 12, further comprising a step of rinsing the head of hair with a rinsing solution after the treatment step.

15. The washing process according to claim 14, wherein the rinsing solution is water.

16. The washing process according to claim 14, wherein the rinsing step lasts less than 1 minute.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Other characteristics and advantages of the present invention will become apparent on reading the following detailed description of nonlimiting exemplary embodiments thereof and on examining the appended drawing, in which:

(2) FIG. 1 is a partial schematic representation of an example of a treatment system according to the invention, and

(3) FIG. 2 illustrates various steps of an example of a process according to the invention.

DETAILED DESCRIPTION

(4) System

(5) FIG. 1 represents a system 1 according to the invention, to be connected to a cold water inlet C and preferably also, as illustrated, to a hot water inlet H.

(6) This system 1 is intended to be used in a hairdressing salon to treat the head of hair B of a client whose head is positioned over a washing sink 10 which serves to collect the water and the product(s) used to treat the head of hair. This sink is, as is known per se, connected to an outlet system for waste water. The system 1 comprises a certain number of connectors and pipes for conveying the water to a dispensing device 11 such as a small shower connected to a flexible hose 12.

(7) In accordance with the invention, the system 1 comprises one or more sources of products for treating the head of hair, for example a product P1 in the example in question, contained in a tank 21.

(8) A collection device makes it possible to collect, in a dosed manner, the product P1 with a view to dispensing it via the dispensing device 11. The product P1 is dosed under the control of an adjustment device 30 comprising, in the example in question, an electronic unit provided with computer means enabling it to communicate with a user interface 40, schematically represented in FIG. 1, and also with one or more databases DB1 containing client data, especially treatment setting data associated with a client and/or a client's identification code.

(9) In the illustrated example, the system 1 comprises temperature control means, such as a mixer 24, controlled by the adjustment device 30, to mix hot water with cold water in a pipe 28 in order to dispense water with the dispensing device 11 at the desired temperature.

(10) The system 1 may also comprise a flowmeter 25, giving information to the adjustment device 30 relating to the flow rate of the liquid delivered to the dispensing device 11, and, by integration, relating to the amount of liquid dispensed.

(11) The system 1 may also, where appropriate, comprise one or more other sensors, not shown, giving information to the adjustment device 30 relating to the amount and/or the flow rate of the product and/or water delivered to the dispensing device 11.

(12) In the illustrated example, the product P1 is collected by means of metering pumps 26, for example of peristaltic type or having a motorized piston, controlled by the adjustment device 30. Nonreturn valves 27 may be present downstream of the pumps 26, these valves 27 opening under the dispensing pressure of the pumps 26.

(13) The liquid is delivered onto the hair at a low flow rate, the pressure provided to the dispensing device 11 being increased by means of a pressure booster 50. The pressure of the liquid exiting the device is between 0.8 and 3 L/minute.

(14) The dispensing device 11 comprises nozzles which direct convergent jets towards each other, so as to make them break each other to reinforce the wetting effect on the hair without giving an unpleasant sensation.

(15) The product P1 used by the system 1 is, for example, a product for treating the head of hair used when it is shampooed, and more generally during a client's session at the sink in the salon.

(16) The product P1 comprises one or more surfactants, chosen especially from anionic surfactants, which are optionally sulfate-based, and especially carboxylic, amphoteric surfactants, such as the betaine surfactant, and/or nonionic surfactants. The product P1 may also comprise additional compounds such as thickeners, fatty substances such as oils and/or waxes, and water.

(17) The product P1 is preferably contained in a container which is easily connected to the system 1. For example, the system 1 comprises quick connectors, which enables easy replacement of an empty container.

(18) The product P1 may be contained in flexible pouches which deform as they are emptied, so as to enable the container to be emptied without taking up air, for better preservation of said container.

(19) The initial amount of the treatment product in the corresponding container is, for example, between 10 ml and 1 litre.

(20) In the example under consideration, the product P1 is injected into the pipe 28 containing water via an injection device 29 to form a treatment solution which is then conveyed to the dispensing device 11. The adjustment device 30 can control the duration of operation of the pump 26 and also the flow rate thereof to control the amount of product P1 delivered onto the head of hair B and the flow rate at which the product P1 is injected.

(21) The amount of product P1 injected into the water is such that the surfactant content in the treatment solution is between 0.35% and 1.5% by weight relative to the total weight of the treatment solution, and preferentially between 0.6% and 1.2% by weight relative to the total weight of the treatment solution. Preferably, the surfactant(s) are chosen from anionic surfactants. Preferably, the treatment solution comprises one or more anionic surfactants in a content ranging from 0.25% to 1% by weight relative to the total weight of the treatment solution, better still from 0.4% to 1%, preferably strictly less than 1% relative to the total mass of the treatment solution. Preferably, the product injection device injects between 2.5 g/minute and 20 g/minute of anionic surfactants into the pipe.

(22) The system 1 may make it possible, by means of the user interface 40, to vary the amount of product P1 delivered onto the head of hair, and also, where appropriate, the concentration of this product in the water which is dispensed by the dispensing device 11. It is thus possible to not deliver any product P1 into the water, in particular during the rinsing step.

(23) In particular, the system may comprise a valve 31 which can be placed in an open position in which the product P1 is injected into the water and a closed position in which the product P1 cannot be injected into the water. The valve 31 especially moves to the closed position during the step of rinsing the hair.

(24) As a variant, it is possible to have several products contained in several containers. The products may differ in their composition or in their concentration of one or more compounds. The adjustment device 30 makes it possible to control the amount of each of the products that is conveyed in the water.

(25) In another implementation variant, the system 1 is arranged to perform premixing of the product with water so as to modify the concentration thereof by diluting it, and the result of this mixing is then conveyed to the dispensing device 11 via a specific tube. This makes it possible to avoid diluting the product in too great an amount of water and/or improves the dilution of the product in the water, for instance in the case of oil-based products.

(26) As a further variant, the system 1 is arranged to perform premixing of several products with each other in predetermined ratios to produce a mixture to be injected into the water to produce a treatment solution.

(27) The system 1 may be arranged to indicate to the person performing the shampoo wash, via the user interface 40, the amount of a product already dispensed onto the head of hair and/or the amount of product remaining in the corresponding container.

(28) The system 1 may also be arranged to indicate, preferably in real time, the amount of a product remaining to be dispensed and/or to be dispensed during the treatment.

(29) The system may be arranged to indicate the amount of water dispensed, and/or the water flow rate, and also the temperature thereof, where appropriate.

(30) All these items of information are, for example, displayed on a screen 41 of the user interface 40.

(31) The user interface 40 may be embodied in various ways. Preferably, the user interface 40 is located close to the sink 10, so as to enable the person performing the shampoo wash to modify the treatment parameters and especially to select the amount and/or the content of product in the water delivered onto the head of hair. The adjustments are made, for example, by means of keys 42 for increasing or decreasing selection parameters for amounts or concentrations.

(32) Where appropriate, the user interface 40 also has a button for setting the temperature of the water, the mixer 24 being, for example, motorized. As a variant, the system 1 comprises a temperature probe and solenoid valves for adjusting the flow rate of hot water and of cold water so as to comply with a nominal temperature.

(33) The user interface 40 may also comprise one or more buttons 44 for selecting actions and/or parameters in the menu displayed on the screen 41. In variants, the screen 41 is a touchscreen.

(34) The user interface 40 may further comprise voice recognition and/or be constituted by a terminal of tablet or smartphone type, communicating with the adjustment device 30.

(35) The user interface 40 may receive information transmitted remotely from, for example, a computer of the salon, a tablet or a cell phone.

(36) In one variant, at least part of the user interface 40 is present on the dispensing device 11.

(37) Preferably, the user interface 40 is protected from water splashes and makes it possible to make adjustments and/or to input information with wet fingers.

(38) The user interface 40 is configured in the described example to enable the person performing the shampoo wash to input one or more items of information relating to the treatment performed. For example, the person performing the shampoo wash may grade different parameters linked to the use of a product on a predetermined scale of values; for example, the user interface 40 is configured to enable the person performing the shampoo wash to input information relating to the speed of foaming, the volume of foam, the speed of rinsing, the ease of disentangling and/or the cleansing efficiency. This information is, for example, a score, for example a number or a letter, or a symbol, for example of emoticon type.

(39) The user interface 40 may be configured to enable the user to select a pre-recorded and pre-characterized formula, especially from the database DB1. In this case, the system 1 performs the adjustment which corresponds to the selected formulation.

(40) The adjustment device 30 may comprise a circuit containing a microprocessor or containing a microcontroller and a power interface making it possible to control solenoid valves and/or pumps and/or other motors so as to produce the dosages corresponding to the selected treatment configurations.

(41) The adjustment device 30 may receive, by means, for example, of an analogue and digital interface, signals originating from various sensors, for example of temperature, of pressure and/or of flow rate, and also, where appropriate, signals giving information relating to the filling level of the containers containing the products to be used to treat the head of hair.

(42) The adjustment device 30 assembly may be located close to the washing sink 10, for example in a casing which is sealed against water splashes; as a variant, the adjustment device 30 comprises at least one electronic circuit close to the sink 10 and at least one electronic circuit at a distance, communicating via a wired or wireless connection with the electronic circuit(s) present close to the sink 10.

(43) The system 1 may comprise one or more sensors for measuring at least one characteristic of the head of hair before cleansing it, for example a comb to be passed through the hair, provided with a microphone or any other sensor which can sense the state of the hair, making it possible to convey a signal representing the state of the hair before treating it. In this case, the adjustment device 30 may be arranged to recommend a setting as a function of the evaluation which has been made, aided by reference data for this purpose. The sensor(s) may further be used to evaluate a result of treating the head of hair by means of the system 1.

(44) In one variant, the system 1 is arranged to display, on the screen 41 of the user interface 40, a questionnaire which the person performing the shampoo wash fills out and, as a function of the results of this questionnaire, to make a suggestion of a setting or of a modification of said setting.

(45) Preferably, the user interface 40 and/or the adjustment device 30 may download data relating to the client whose hair is going to be treated, from the database DB1, so as to remind the person performing the shampoo wash of past treatment setting(s), observed result(s) and also the recommended setting(s) for the treatment to be performed.

(46) The system 1 preferably comprises a means for storing at least one setting in memory.

(47) The setting may be stored in memory at the request of the person performing the shampoo wash, for example by pressing a button for this purpose on the user interface 40. As a variant, the setting is automatically stored in memory as soon as a treatment result is input. The setting may be stored in memory on a removable memory medium introduced into the adjustment device 30, and/or in a remote database with which the system 1 is in communication, especially the database DB1.

(48) The system 1 may be configured to control the outlet of the sink 10, by acting, for example, on a solenoid valve 55, in order especially to open it or close it as a function of the treatment or rinsing requirement. For example, when the dispensing device 11 dispenses a product, the outlet is closed so as to enable the user to treat the hair with the amount of water and of product dispensed, the product being in a known amount like the water; once the hair has been treated, the outlet is opened to proceed to the rinsing, for example.

(49) Process

(50) An example of a hair treatment process for obtaining efficient washing of the hair in a reduced time while at the same time having low water consumption will now be described.

(51) Firstly, in step 100, the person performing the shampoo wash adjusts the amount of product and/or the concentration of product and/or flow rate of liquid by means of the user interface 40 of the system 1, and can also indicate the choice of product that he or she wishes to use in the case of several products and/or respective concentrations thereof.

(52) Adjustment information may be input as mentioned above, following an assessment questionnaire and/or a measurement taken on the head of hair of the client whose hair is going to be treated.

(53) It is further possible for the step of selecting the settings to be automatic and to result from downloading data specific to the client whose hair is going to be treated, which data are located, for example, on a memory medium, such as a USB stick, provided by this client. The data may further be present in a file recorded on their cell phone or downloaded from an internal database of the hairdressing salon or external thereto, especially the database DB1.

(54) Downloading data relating to previous treatments undergone by the client may enable the person performing the shampoo wash or the system 1 to propose a setting suggestion when the treatment results observed during previous treatments are not entirely satisfactory.

(55) On the other hand, if the correct settings have been found from previous treatments, for example in terms of products used, amount delivered onto the head of hair and also, where appropriate, the chronology of use of different products, then the system 1 may simply signal to the person performing the shampoo wash that the setting parameters that the system 1 proposes to use are those which have been considered to be satisfactory during previous treatments, such that the person performing the shampoo wash only has to confirm the proposal made by the system. In order to find the correct settings and/or the correct treatment sequence, the user may have performed successive tests with the assistance of the system 1 by means of pre-existing test programs as described above.

(56) A concentration and/or an amount may be adjusted in various ways and, for example, the person performing the shampoo wash may simply indicate a desired level of strength of the product.

(57) For example, the person performing the shampoo wash may select, from the user interface 40, from among several degrees such as “less concentrated”, “normal concentration”, “more concentrated” and the system 1 produces the corresponding dosage.

(58) The flow rate of liquid exiting is between 0.5 and 5 L/minute, better still between 0.8 and 3 L/minute.

(59) The amount of product selected is such that the surfactant content in the treatment solution ranges from 0.35% to 1.5% by weight relative to the total weight of the treatment solution, and preferentially from 0.6% to 1.2% by weight relative to the total weight of the treatment solution.

(60) Preferably, the surfactant(s) are chosen from anionic surfactants. Preferably, the treatment solution comprises one or more anionic surfactants in a content ranging from 0.25% to 1% relative to the total weight of the treatment solution, better still from 0.4% to 1% by weight relative to the total weight of the treatment solution, preferably strictly less than 1% by weight relative to the total weight of the treatment solution. Preferably, the product injection device injects between 2.5 g/minute and 20 g/minute of anionic surfactants into the pipe.

(61) Next, in step 101, the system 1 delivers the treatment solution containing the selected product(s) onto the head of hair in the concentrations and/or with the amounts selected and/or with the selected flow rate.

(62) Step 101 may take between 1 and 20 seconds.

(63) In step 102, the liquid applied to the hair is rinsed out by switching off the injection of product containing surfactants in water. The flow rate of liquid may remain unchanged or may be changed relative to the preceding application.

(64) Step 102 takes less than 1 minute, better still less than 40 seconds.

(65) The system 1 is configured, in the example in question, to record or propose storing in memory, in step 103, a certain number of items of data generated when the client is treated.

(66) These data may be combined with a client ID, so as to be able to be recovered subsequently, for example when the client's head of hair is treated again.

Example A

(67) In this example, one of the tanks of the system 1 is filled with the following product P1: Product P1: Shampoo whose composition comprises the ingredients indicated in the table below. The amounts are indicated as weight percentages of starting material in unmodified form relative to the total weight of the composition:

(68) TABLE-US-00001 Ingredients Proportion Disodium cocoamphodiacetate as an 15.87% aqueous 31.5% solution (Miranol C2M sold (5% active by the company Rhodia/Solvay) material) Sodium lauryl ether sulfate as an aqueous 14.28% 70% solution (Texapon N70 sold by the (10% active company BASF) material) Water qs 100

(69) At the time of washing the hair, the person washing the hair sets the system according to the invention to deliver: Test 1: 4% of product P1 in water with a flow rate of 1 L/minute. The mass proportion of surfactant in the water is thus 0.6% and that of anionic surfactant is 0.4%. The flow rate of surfactant in the pipe is 6 g/minute and that of anionic surfactants is 4 g/minute. Test 2: 2.5% of product P1 in water with a flow rate of 1 L/minute. The mass proportion of surfactant in the water is thus 0.375% and that of anionic surfactant is 0.25%. The flow rate of surfactant in the pipe is 3.75 g/minute and that of anionic surfactant is 2.5 g/minute. Test 3: 1% of product P1 in water with a flow rate of 1 L/minute. The mass proportion of surfactant in the water is thus 0.15% and that of anionic surfactant is 0.1%. The flow rate of surfactant in the pipe is 1.5 g/minute and that of anionic surfactant is 1 g/minute. Test 4: 8% of product P1 in water with a flow rate of 1 L/minute. The mass proportion of surfactant in the water is thus 1.2% and that of anionic surfactant is 0.8%. The flow rate of surfactant in the pipe is 12 g/minute and that of anionic surfactant is 8 g/minute.

(70) Tests 1 and 2 are according to the invention and tests 3 and 4 are outside the invention.

(71) These tests are delivered onto a head of natural dry hair about 30 cm long for 12 seconds.

(72) With tests 1, 2 and 4, an abundant foam is obtained. With test 3, an abundant foam is obtained, but it is resorbed when the scalp is massaged.

(73) The hair is then rinsed with clear water at a water flow rate of 1 L/minute. The person performing the shampoo wash stops the rinsing when the head of hair is thoroughly rinsed.

(74) With tests 1 and 2, the rinsing takes 35 and 25 seconds, respectively. With test 3, the rinsing takes 1 minute. With test 4, the rinsing takes 1 minute 30 seconds.

(75) It is thus concluded that, with a low flow rate of liquid, tests 1 and 2, which are according to the invention, allow good application of product and rapid rinsing. Test 3, which has a surfactant proportion below that of the invention, does not allow good application of the product since the disappearance of the foam on massaging prevents identification of the place where the product was applied, which makes it difficult to apply the product uniformly to the head of hair and does not allow rapid rinsing of the head of hair. Test 4, which has a mass proportion of surfactants above that of the invention does not allow rapid rinsing of the head of hair.

Example B

(76) Tests 5 and 6 are performed by applying, by hand, the same amount of product P1 as in tests 1 and 2, respectively. The hair is then rubbed.

(77) The hair is then rinsed with clear water at a water flow rate of 1 L/minute. The person performing the shampoo wash stops the rinsing when the head of hair is thoroughly rinsed.

(78) With test 5, the rinsing takes 3 minutes 5 seconds. With test 6, the rinsing takes 2 minutes 45 seconds.

(79) The rinsing operations of tests 5 and 6 take much longer than those of tests 1 and 2.

Example C

(80) A test 7 is performed by applying, by hand, the same amount of product P1 as in test 2, followed by rinsing with a flow rate of clear water of 12 L/minute. The person performing the shampoo wash stops the rinsing when the head of hair is thoroughly rinsed.

(81) With test 7, the rinsing takes 21 seconds.

(82) Test 2 is thus performed almost as rapidly as when a standard application is performed according to test 7, but with a substantial saving in water, test 2 requiring 0.4 L of water for the rinsing, whereas test 7 requires 4 L of clear water for the rinsing.

Example D

(83) A test 8 is performed by applying a product according to test 2, but by rinsing with clear water at a water flow rate of 12 L/minute.

(84) With test 8, the rinsing takes 14 seconds.

(85) Test 8 thus allows an appreciable saving in water relative to test 7, test 8 requiring 2.8 L of water for the rinsing, whereas test 7 requires 4 L of clear water for the rinsing.

(86) Examples A, B, C and D Performed on Clean Hair

(87) TABLE-US-00002 Amount of Cleanliness Test water used (evaluated (clean Application of Rinsing for the after hair) the surfactant Rinsing time (s) rinsing (L) drying) 2 In the low flow- Low flow-rate 25 0.4 Yes rate stream (1 stream (1 L/minute) L/minute) 6 By hand Low flow-rate 165 2.75 Yes stream (1 L/minute) 7 By hand Standard 21 4 Yes stream (12 L/minute) 8 In the low flow- Standard 14 2.8 Yes rate stream (1 stream (12 L/minute) L/minute)

Example E

(88) Test 2 is performed again on hair that has been soiled beforehand with 0.8 g of oleic acid applied to the head of hair. Tests 9 and 10 are also performed, on hair that has also been soiled beforehand with 0.8 g of oleic acid applied to the head of hair, by applying the same amount of product as in test 2 with a flow rate of 12 L/minute. In test 9, the rinsing is performed with a flow rate of 1 L/minute, and in test 10, the rinsing is performed with a flow rate of 12 L/minute. The person performing the shampoo wash stops the rinsing when the head of hair is thoroughly rinsed.

(89) With test 9, the rinsing takes 18 seconds, and with test 10, the rinsing takes 12 seconds. However, the hair appears greasy, which indicates insufficient rinsing. Such is not the case with test 2.

(90) TABLE-US-00003 Amount of Cleanliness Test water used (evaluated (soiled Application of Rinsing for the after hair) the surfactant Rinsing time (s) rinsing (L) drying) 2 In the low flow- Low flow-rate 25 0.4 Yes rate stream (1 stream (1 L/minute) L/minute) 9 In a standard Low flow-rate 18 0.3 No stream of water stream (1 (12 L/minute) L/minute) 10 In a standard Standard 12 0.2 No stream of water stream (12 (12 L/minute) L/minute)

Example F

(91) Tests 1 and 2 are performed changing the formulation used. The following formulations are used: Product P2: Formulation containing a mass proportion of about 15% of an amphoteric surfactant in water, product P2 being a mixture of: Cocamidopropyl betaine (BASF) composed of 38% by mass of cocoyl amidopropyl betaine in aqueous solution: 39.5% by mass, i.e. about 15% by mass of active material, and Water: qs 100% Product P3: Formulation containing about 15% of a nonionic surfactant in water, product P3 being a mixture of: Plantacare 118 UP (BASF) composed of 53% by mass of (C8/C16)alkyl polyglucoside (1.4) in aqueous solution: 29% by mass, i.e. about 15% by mass of active material, and Water: qs 100% Product P4: Formulation containing non-sulfate sulfur-based surfactants, product P4 being a mixture composed of: Stepan Mild LSB composed of a mixture of sodium lauryl sulfoacetate and disodium lauryl ether sulfosuccinate in a 50/50 mass ratio in water at 25% by mass:40.5% by mass Sodium cocoyl isethionate: 9% by mass Water: qs 100%

(92) The results are given in the table below.

(93) TABLE-US-00004 Rinsing time Amount of water used Product Foam (s) for the rinsing (L) P1 Abundant 25 0.4 P2 Abundant 34 0.55 P3 Abundant 29 0.5 P4 Abundant 39 0.65

(94) Depending on the formulation used, the foam obtained varies in abundance, but the rinsing operations all offer savings in terms of water and reduced time, especially less than one minute.