FR2980180A1 - SACHET HAS AT LEAST TWO COMPARTMENTS - Google Patents

Abstract

The present invention relates to a sachet (1) with at least two compartments (5, 7), comprising: - a first compartment (5), containing a composition, - a second compartment (7), of smaller capacity than the first, containing the same composition, the first and second compartments being made by welding two sheets one over the other, the compartments being separated by a weld line (23), the sheets each extending continuously from one side to the other; another of the weld line (23) all along it, from one compartment to another.

Description

The present invention relates to sachets with at least two compartments and methods for their manufacture. The invention relates more particularly, but not exclusively, to sachets intended for conditioning a hair coloring to be used at home.

Manufacturers of coloring products usually recommend the consumer to perform a test touch before the application of the coloring on the hair in order to highlight a possible undesirable physiological reaction of the skin. In particular, such a reaction may be related to an allergy problem.

This test is preferably carried out 48 hours before using the coloration, by depositing a drop of product on a cutaneous surface, and in particular behind the ear, in order then to see if this deposit gives rise to the appearance of a redness, in which case the application of staining is discouraged. Capillary dyes are usually sensitive to oxygen. In particular, the oxidation dyes used in the permanent dyes react strongly in the presence of oxygen, so that if the drop of product is taken from the same compartment as that containing the composition to be used on the hair, the opening of the compartment may result in alteration of at least the appearance of the composition, which may lead the consumer to think of a product defect.

The application FR 2 918 038 describes a bag with two compartments detachable through precut. Such a bag is of relatively complex manufacture. EP 1 669 305 A1 discloses a sheet material suitable for making sachets containing a hair coloring composition. EP 1 357 047 A1 discloses a tube whose bottom is provided with a second compartment separable from the remainder of the tube. EP 0 639 364 A1 and US Pat. No. 6,047,817 disclose two-compartment packaging devices. There is a need to provide the consumer with means to perform a test touch without impairing the quality of the coloring to be applied to the hair, and without the proposed solution resulting in additional cost or poses logistical problems. The invention aims to meet this need.

According to one of its aspects, the subject of the invention is a bag with at least two compartments, comprising: a first compartment, containing a composition, a second compartment, of smaller capacity than the first, containing the same composition, the first and second compartments being made by welding two sheets one on the other, the compartments being separated by a weld line, the sheets each extending continuously on either side of the weld line all the along it, from one compartment to another.

By "bag" must be understood a flexible pouch excluding the presence of a dispensing member such as a capsule or an injected tip, unlike a tube. The invention makes it possible to provide a reliable and economical packaging of two quantities of a product, for example a test quantity and a larger quantity.

The second compartment, of reduced volume, allows the user the possibility of using the composition contained in this second compartment, and waiting for the 48 hours required for the safety test, without the composition contained in the first compartment. is not affected by the environment; the user can also directly use the composition contained in the first compartment, without worrying about the composition contained in the second compartment. The invention. allows easy opening of each of the compartments, preferably without tools, thanks to one or more tear primers. The first compartment is intended to be open according to a first opening line marked on the bag, preferably adjacent to the closure line.

The second compartment is intended to be opened along a second opening line, marked on the bag. At least one, and preferably each of the first and second opening lines, is identified by two tearing primers at its ends, constituted for example by notches cut into the sheets.

The capacity C2 of the second compartment is less than the capacity C1 of the first compartment, with for example 0.005 5 C2 / C1 0.9, better 0.0075 _- C2 / C1 0.1.

The capacity C1 is, for example, from 10 to 200 ml, C2 ranging for example from 0.2 to 10 ml. The compartments are each delimited by solder lines, which excludes any injected dispensing tip.

According to another of its aspects, the subject of the invention is also a process for manufacturing and filling a bag, in particular, as defined above, comprising the steps of: welding, in particular by thermal welding, two sheets to form a bag having an open space at one end only, fill this space with the composition, - close the opening of the bag, weld through the composition, in particular by ultrasonic welding, to form a closure line and define two compartments on both sides of it, the contents of these two compartments being unequal. According to another of its aspects, the subject of the invention is also a method of hair treatment by means of a sachet according to the invention, as defined above, comprising the following steps: - carrying out a test with a quantity of test contained in the second compartment, if the test shows no sign of allergy, apply the contents of the first compartment on the hair. The invention further relates, in another of its aspects, to the use of a sachet according to the invention, as defined above, for the packaging of a permanent, permanent or temporary coloring product. The invention will be better understood on reading the following detailed description, nonlimiting exemplary embodiments thereof, and on examining the appended drawing, in which: FIG. a front view of an example of a bag made according to the invention, - Figures 2 and 3 are sections respectively along II-II and Figure 1, and - Figures 4 and 5 are views similar to Figure 1 of variants of embodiment. The bag 1 shown in FIG. 1 has a generally elongate shape along a longitudinal axis X and comprises two sheets 2 and 3 which are assembled along closure lines so as to define a first compartment 5 and a second compartment 7 which contain, in the example considered, the same hair dye The latter can be a product for permanent coloring (oxidation dye), or a product for permanent-temporary coloring (direct dyeing). Examples of such products are given in Clarence R. Robbins' book "Chemical and Physical Behavior of Human Hair", 4th Edition, Chapter 6, pages 311-344. In particular, the dye composition contained in the sachet may contain one or more oxidation bases and / or one or more couplers conventionally used for dyeing keratinous fibers.

Among the oxidation bases that may be mentioned are para-phenylenediamines, bis-phenylalkylenediamines, para-aminophenols, bis-para-aminophenols, ortho-aminophenols, heterocyclic bases and their addition salts. Among the couplers, there may be mentioned meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalenic couplers, heterocyclic couplers and their addition salts. The dyeing composition may also comprise an oxidizing agent which may be chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulfates, as well as the enzymes from which mention may be made of peroxidases, 2-electron oxidoreductases such as uricases and 4-electron oxygenases such as laccases. The use of hydrogen peroxide is particularly preferred. The dye composition may further contain additional direct dyes. Such dyes may be used alone or in combination with a dyeing composition as previously described. These direct dyes are, for example, chosen from neutral, acidic or cationic nitro-benzene direct dyes, neutral azo, acid or cationic direct dyes, tetraazapentamethine dyes, neutral or acidic or cationic quinone dyes, in particular neutral anthraquinone dyes and direct azine dyes. , triarylmethane direct dyes, indoamine direct dyes and natural direct dyes. Among the natural direct dyes that may be mentioned are lawsone, juglone, alizarin, purpurin, carminic acid, kermesic acid, purpurogalline, protocatechaldehyde, indigo, isatin, curcumin, spinulosin, apigenidine. It is also possible to use the extracts or decoctions containing these natural dyes, and in particular poultices or extracts made from henna. Agents that are beneficial for keratinous substances, or nutrient solution, may also be added to such compositions, these agents possibly being chosen from: (1) amino acids, oligopeptides, peptides, hydrolysed or non-modified or modified proteins (2) branched and unbranched fatty acids and alcohols, (3) animal, vegetable or mineral waxes, (4) ceramides and pseudo-ceramides, (5) hydroxylated organic acids, (6) UV filters, (7) antioxidants and anti-free radical agents, (8) chelating agents, (9) anti-dandruff agents, (10) seborea regulatory agents, (11) soothing agents, (12) cationic surfactants, 13) amphoteric polymers, (14) organomodified or non-organomodified silicones, (15) mineral, vegetable or animal oils, (16) polyisobutenes and poly (α-olefins), (17) esters, (18) soluble or dispersed anionic polymers, (19) nonionic polymers soluble or dispersed, and mixtures thereof.

The first compartment 5 extends along the X axis, which is a longitudinal axis X for this compartment, over a length L and its width decreases towards an upper end to define a neck 9 which serves for the distribution of the contents of this compartment this neck 9 can be opened by cutting the bag according to a transverse tear line 10. The second compartment 7 extends in the extension of the first compartment 5, above the neck 9. The capacity of the first compartment 5 is for example of 100 ml and that of the second of 0.5 ml. Notches 11 and 12 may advantageously be made at the ends of the tear line 10, as illustrated, so as to create a tear primer and facilitate the opening of the bag. These notches 11 and 12 locate the location of the tear line 10 for the user. The neck 9 defines a dispensing opening 26 of width 7 smaller than the width w of the compartment 5 under the neck 9. For example, 0 <I <w / 3.

The sheets 2 and 3 are welded together on lines 20 along the sides of the bag, on the bottom 21 of the bag 1 and on the portions 22 defining the neck 9. The compartment 5 is closed above the tear line 10 by a weld along a closure line 23, which separates the compartments 5 and 7. In the example shown, the width of the compartment 7 is less than or equal to the width 1 of the opening 26 and decreases away of the latter to a transverse tear line 30 to access the contents of the second compartment 7. Notches 31 and 32 are advantageously made at the ends of the tear line 30. These notches 31 and 32 locate the location of the tear line 30 for the user. In the example shown, the tear lines 10 and 30 are parallel to each other and to the closure line 23 which lies between them. The sheets 2 and 3 are welded to portions 38 along the second compartment 7, and above it at 39. As can be seen in FIG. 3 in particular, each sheet 2 or 3 extends continuously from either side of the closing line 23 when passing from one compartment to another. In other words, there is no cutting of the sheet 2 or 3 between the compartments 5 and 7, unlike the bag disclosed in FR 2 918 038 where the compartments are separated by cuts made in the sheets used to make the bag. The absence of such cuts facilitates the filling of the bag, which can be done using a single filling rod, as detailed below. In the example of Figure 1, the only cuts made are those that give the bag its outer contour.

If this is the first time that the user tries the composition C, it tears the second compartment at the corresponding opening primer constituted by the notch 31 or 32, takes in this compartment the amount of composition required, and remove it at the required place, behind the ear for example. After the prescribed time, 48 hours for example, and in the absence of an immune reaction, it opens the first compartment 5 at the corresponding opening primer, that is to say, is 11 or 12, and performs the application . If the user has already performed a test with the same composition C, it opens directly the first compartment 5 at the notch 11 or 12, and performs the application.

The opening of the first compartment 5 may result in the separation of the compartments 7 and 5, the compartment 7 being completely detached from the bag. The bag 1 can be made and filled in the following manner. The two sheets 2 and 3 are assembled by heat sealing, these sheets being for example as described in the European patent application EP 1 669 305, each comprising a multilayer complex, this complex may comprise a metal layer, for example aluminum, an adhesion agent, for example a copolymer of ethylene and acrylic acid, and a layer of non-metallic material, for example PE, bonded to the metal layer via the adhesion agent. Each sheet preferably has a thickness of less than or equal to 250 μm.

The two sheets 2 and 3 of the multilayer material are arranged opposite one another, weldable part against weldable part, and welded together by thermal welding so as to close the bag leaving an open part. This open portion may be located on the opposite side to the neck 9, but also on one of the lateral sides parallel to the X axis.

By this open part, a rod is inserted from a device for filling the composition and the latter is injected.

After removal of the filling device, a heat seal closes the bag completely sealed manner, while giving it the desired final shape. The additional welding is then carried out along the closure line 23 to form and separate the two compartments 5 and 7. This additional weld is of the type which makes it possible to weld through the composition without damaging it, preferably an ultrasonic weld. The two manufacturing steps are carried out one after the other, without breaking the production line. The invention is not limited to the example which has just been described.

For example, in order to facilitate the opening of the two compartments 5 and 7, it is possible to replace in the welded zone delimiting each of these two compartments the notches 11, 12, 31 and 32 by any other easy-opening comm device, for example in the case of sheet of multilayer composite material, a pre-cut of the outer layer, without reaching the aluminum layer.

A pouch according to the invention makes it possible to offer safety to the user, has a carbon footprint lower than that of an aluminum tube as currently used, is of a lower cost price than such a tube and a bag as presented in FR 2 918 038, and is much simpler to produce industrially. The shape of the bag as well as that of the first and second compartments can be modified without departing from the scope of the present invention. Thus, there is shown in Figure 4 a variant where the bag 1 has a full width over its entire height, with notches 11, 12, 31 and 32 near. In the variant of FIG. 5, the second compartment 7 is made in a corner of the bag 1.

The tear lines 10 and 30 thus extend obliquely relative to the longitudinal axis X. The bag 1 has for example a rectangular contour. The closure line 23 extends obliquely, parallel to the tear lines 10 and 30. The compartment 5 is delimited above by a closure line 50, perpendicular to the longitudinal axis X. The compartment 7 is delimited also higher by this line. 50 and laterally by the adjacent line 20. The expression "having one" shall be understood as being synonymous with "having at least one", unless the opposite is specified.

Claims (11)

REVENDICATIONS1. Bag () with at least two compartments (5, 7), comprising: - a first compartment (5), containing a composition (C), a second compartment (7), of smaller capacity than the first, containing the same composition , the first and second compartments being made by welding two sheets (2, 3) one on the other, the compartments being separated by a weld line (23), the sheets (2, 3) each extending continuously on both sides of the weld line (23) all along it, from one compartment to another. 2. Bag according to claim 1, the first compartment (5) being intended to be open in a first opening line (10) marked on the bag, adjacent to the closing line (23). 3. Bag according to claim 1 or 2, the second compartment being intended to be open along a second opening line (30) marked on the bag. 4. Sachet according to claims 2 and 3, each of the first and second opening lines being marked by two tear primers at its ends. 5. Bag according to any one of claims 1 to 4, the capacity C2 of the second compartment (7) being less than the capacity C1 of the first compartment (5), with 0.005 5 C2 / C1 5 0.9, better 0, 0075 5. C2 / Ci 5._ 0.1. 6. Sachet according to any one of claims 1 to 5, C1 ranging from 10 to 200 ml, C2 ranging from 0.2 to 10 ml. 7. Bag according to any one of claims 1 to 6, the compartments being each delimited by solder lines. 8. Sachet according to any one of claims 1 to 7, the composition (C) being a dye composition for hair dyeing. 9. A method of manufacturing and filling a bag as defined in any one of the preceding claims, comprising the steps of: - welding, in particular by thermal welding, two sheets (2, 3) to form a bag having an open space at one end only, fill this space with the composition, - close the opening of the bag, - weld through the composition to form the closing line (23) and define the two compartments (5, 7) of capacities uneven. 10. A method of treating hair by means of a bag as defined in any one of claims 1 to 9, comprising the steps of: performing a test with a test quantity contained in the second compartment (7), if the test shows no sign of allergy, apply the contents of the first compartment (5) to the hair. 11. Use of a sachet according to any one of claims 1 to 9 for the packaging of a permanent, semi-permanent or temporary coloring product.