FR2836939A1 - SUPPORT PAPER SHEETS FOR APPLYING COSMETIC PRODUCTS AND METHOD FOR MANUFACTURING SUCH SHEETS - Google Patents

Abstract

The invention relates to a sheet of backing paper (1), for the application of cosmetic products impregnated or covered with substance (s) or powder (s), characterized in that it has at least one margin (3) devoid of substance or powder.The invention also relates to a process for manufacturing such sheets (1), according to which a mixture containing a cosmetic product is deposited by a pick-up roller on a web of paper, characterized in that one positions between the roller and the width at least one strip of material having a weak adhesion interlocking the roller, thus avoiding contact between the roller and the width over at least one zone of said width.

Description

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SUPPORT PAPER SHEETS FOR APPLYING COSMETIC PRODUCTS AND PROCESS FOR PRODUCING THE SAME
SUCH SHEETS
The present invention relates to papers impregnated or covered with substances or powders. It relates in particular to powdered papers for cosmetic use.

 Paper is commonly used as a support for the application to the skin of cosmetic products such as powders, perfumes or treatment agents.

 Patent JP 2-036114 filed by NAKAMURA KENJI describes sheets covered with a layer of a cosmetic product comprising a mixture of powder and treatment agents allowing for example the absorption of sweat, the absorption of UV or fulfilling a deodorant function.

 These sheets of paper being essentially intended for nomadic use, they are generally presented in a case or a box allowing to facilitate their transport and their use. These sheets have the advantage of allowing the user to apply a cosmetic product when he is in situations or places in which he could not use this product in its traditional form. This is the case, for example, in transport or at a workplace.

 The disadvantage of these papers is that to be effective, the products with which they are covered are generally adapted to be easily transferred from the paper to the skin. These products therefore tend to adhere to the fingers of the user when the latter handles one of these papers. This drawback is all the more annoying that the products deposited on these papers can for example be colored powders and that the user cannot always clean his hands after using the paper.

 Patent JP 1-143811 filed by SHISEIDO K. K. describes a paper on which microcapsules are deposited. These microcapsules are closed microscopic capsules made for example of resin

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 flexible and containing a cosmetic preparation. They break by compression and release the substances they contain on the skin.

This characteristic makes it possible to limit the contact of the substances with the fingers of the user but it does not make it possible to completely eliminate it.

 An object of the invention is to provide a sheet of paper impregnated or covered with substances or powders making it possible to avoid the transfer of substances or powders onto the fingers of the user.

 Another object of the invention is to propose a method for manufacturing such sheets.

 To this end, the invention provides a sheet of support paper for the application of cosmetic products impregnated or covered with substance (s) or powder (s) characterized in that it has at least one margin devoid of substance or powder.

 The margin advantageously allows the user to take the sheet while avoiding any contact of the substances or products deposited on the paper with his fingers.

 For this purpose, the margin must have a sufficient width for the user to be able to place his fingers there.

 The sheet of the invention also has the advantage of limiting contamination of the substance (s) or powder (s) by the fingers of the user.

2 - elle est recouverte d'une poudre cosmétique à raison de 1 à 50 g/m2, préférentiellement de 1 à 30 g/m2. The sheet can have the following characteristics: - it has a basis weight between 10 and 100 g / m2, preferably between 10 and 35 g / m2, - the width of the margin is between 10 and 100 mm

2 - it is covered with a cosmetic powder at a rate of 1 to 50 g / m2, preferably from 1 to 30 g / m2.

 In the case where the sheets are stored in a case or a box, the margin of each sheet is positioned so as to be presented to the user so that the latter can extract the sheet by pulling it by the margin.

 To obtain sheets of paper impregnated or covered with substances or powder having at least one margin devoid of

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 substance or powder, we want to make paper webs with blank areas, that is to say not covered with substance or powder.

 One solution would be to deposit powder on the entire surface of the width and then remove the deposit on certain areas. However, no techniques are currently known for treating a powdered surface which makes it possible to remove all of the powder deposited without altering the surface of the paper.

 Another solution would be to deposit a mixture of powder and binder on the entire surface of the width and then to inhibit the layer of powder on certain areas. For example, one can deposit layers of varnish on the width in the form of strips. The varnish strips thus constitute gripping zones where the powder is not in contact with the user's fingers. The disadvantage of this solution is that in the case of cosmetic powders, for example, the varnish does not adhere sufficiently to the powder layer.

 Yet another solution would be to carry out a preliminary treatment of the paper, for example by depositing a special layer per zone, then preventing the substance or the powder from adhering to the zones thus pretreated. The disadvantage of this solution is that these areas are slightly smeared with powder, most often colored, which is not rewarding for a cosmetic application.

 Conventional techniques for coating the paper are known, making it possible not to transfer the product or the substance deposited on certain areas of the paper.

 In particular, the gravure technique consists in transferring a mixture of powder and binder from a hollow engraved cylinder to a support.

 The pattern to be printed is engraved on the surface of the cylinder. This engraved pattern constitutes the transfer stereotype of the cylinder on the support. It consists of tiny cavities, the depth and shape of which vary depending on the desired layer removal. The mixture of powder and binder must be very liquid to fill the cavities of the plate which will then empty

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 on the support. The disadvantage of this technique is that it does not make it possible to obtain the desired deposit (from 2 to 20 g / m2).

 The flexographic technique consists in transferring a relief image onto an inked rubber plate then pressed onto the paper. Again, this process does not allow the transfer of dry quantity greater than 2 or 3 g / m2 with a uniform appearance.

 Other techniques can also be envisaged, for example the injection under pressure of the liquid mixture to be deposited in nozzles of calibrated size. These nozzles deposit the mixture on certain zones when the width moves. The disadvantage of this technique is that it is poorly applicable to the deposition of this type of mixture because of its viscosity. Indeed, the deposited mixture clogs the nozzles, damaging the appearance of the removal. In addition, it is not known how to regulate the flow rate of the mixture, which does not make it possible to produce grammage and thickness deposits on demand.

 It is therefore desirable to provide a process suitable for the manufacture of sheets of paper impregnated or covered with substance or powder.

 To this end, the invention provides a process for manufacturing sheets of backing paper for the application of cosmetic products, according to which a mixture containing a cosmetic product is deposited by a pick-up roller on a web of paper, characterized in that the between the roller and the width, at least one strip of material having a weak adhesion which positions the roller is positioned, thereby avoiding contact between the roller and the width over at least one zone of said width.

 Thanks to the use of strips of low adhesion materials, the process makes it possible to obtain a sufficiently thick powder deposit and only on the areas of the paper in contact with the pick-up roller.

 This process therefore guarantees that the powder is not transferred to the fingers of the user of the powdered sheets.

 It also allows a saving of raw material since it avoids the deposition of powder on certain areas of the paper.

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 Finally, this process makes it possible to produce a powdered paper having powder-free areas by easily modifying existing coating installations.

 In one implementation of the invention, the strip of weak adhesion material has a variable width so that it is possible to increase or decrease the width of the blank zone of the width by simple longitudinal displacement of the strip.

 The strip is made of a material preferably chosen from the following materials: polytetrafluoroethylene, polypropylene, polyethylene or a composition based on copper, nickel and chromium.

 Other characteristics and advantages will also emerge from the description which follows, which is purely illustrative and not limiting and should be read with reference to the appended drawings, in which: - Figure 1 is a schematic representation of an example of a sheet of powdered paper in accordance with an embodiment of the invention, - FIGS. 2A and 2B are schematic representations of examples of stacking sheets in a case allowing the user to take the paper by its margin, - FIG. 3 is a schematic representation of a coating station for implementing the method of the invention, - Figure 4 is a schematic representation of a coating installation, - Figure 5 is a schematic representation of a width of powdered paper intended to be cut to produce sheets of powdered paper.

 FIG. 1 represents a sheet of powdered paper 1 of dimensions 100 × 100 mm, consisting of a conventional paper support having a grammage of between 15 and 20 g / m2. The sheet 1 is divided into two zones: an application zone 2 and a zone forming a grip margin 3. The application zone 2 of the sheet is intended to be brought into contact with the skin in order to apply a cosmetic powder to it .

This application zone 2 has a width of 75 mm and is covered with a layer of powder at the rate of approximately 10 g / m2. The margin of

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 gripping 3 is intended to allow the user to place his fingers there. To this end, it has a width of 25 mm devoid of powder in order to ensure good grip of the sheet.

 2A shows an example of stacking sheets similar to the sheet shown in Figure 1. The sheets form a pile 11 placed in a dispenser or case 12. The dispenser 12 has a slot 13 allowing the user to take a sheet of paper 15 located on top of the pile 11 without placing his fingers 14 on the powdered area of the sheet 15 (shown in thick line). For this purpose, the margin of the sheet 15 (shown in white line) exceeds by the slot 13 of the dispenser 12. The sheets constituting the pile 11 are conventionally folded and tangled in a zigzag so that when the user picks up the sheet upper 15, this drives the sheet 16 located immediately below and so that it in turn protrudes through the slot 13 of the dispenser 12. The sheet 16 is oriented so that, after removal of the sheet 15 , its margined area protrudes through slot 13.

 Other types of stacking are possible. For example, the sheets are not necessarily entangled but can be stacked in a notebook as illustrated in FIG. 2B. In this case, they are superimposed on each other and joined by their adjacent edge. One of the free edges of the sheets will preferably have a grip margin.

 We will now describe the manufacture of such sheets of powdered paper.

 FIG. 3 represents a coating station 21 comprising a tray 23 containing a mixture 24 to be deposited on a web 25 of paper and a pick-up roller 22 whose surface is in contact with the mixture 24. This mixture 24 consists of a make-up powder, a binding agent, a dispersing agent, water, as well as additives such as a rheology regulator, an anti-foaming agent, active principles, etc. The width of paper 25 intended to be coated with this mixture is stretched and positioned so that one of its surfaces is tangent to the pick-up roller 22, the latter extending across the width of width 25.

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 While the width 25 travels in the direction indicated by the arrows, the gripping roller 22 is rotated in the direction opposite to the travel of the width. By turning, the roller is permanently coated with mixture 24 over its entire width. A pre-dosing scraper 29 makes it possible to limit the thickness of the mixture on the pick-up roller 22. In contact between the roller 22 and the width 25, the mixture is transferred from the roller 22 to the moving width 25.

 Two rectangular strips of polytetrafluoroethylene (PTFE) 26 and 27 have been positioned between the pick-up roller 22 and the width 25. These two strips 26 and 27 tie the roll 22 over about half of its circumference (tie 180 degrees), thus preventing the contact between the roller 22 and the width 25 in two zones corresponding to the width of the two strips 26 and 27.

 As a result, as it travels, the width of paper 25 is coated over its entire width of mixture 24, except on two zones forming longitudinal strips devoid of mixture, these two zones being adjacent to the two PTFE strips 26 and 27.

 The predosing scraper 29, by limiting the thickness of the mixture on the roller 22, prevents the mixture from smearing in the areas devoid of powder. It thus makes it possible to obtain clear demarcation lines between the areas coated with the mixture and the virgin areas of the width 25.

 The two PTFE strips 26 and 27 are fixed by one of their ends to a bar 28 making it possible to maintain their spacing. Weights not shown in this figure have been suspended from the free end of the strips 26 and 27. The scrolling of the width 25 on the one hand, the weight of the weights and the rotation of the roller 22 on the other hand, make it possible to maintain the two strips 26 and 27 of PTFE in permanent equilibrium between the width 25 and the roller 22.

 In an alternative embodiment of this coating step, the PTFE strips 26 and 27 advantageously have a variable width.

 For example, they may have a triangular shape (as shown in dotted lines in Figure 3) so that it is possible

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 increase or decrease the width of the areas without mixing by simple longitudinal displacement of the PTFE strips 26 and 27.

 These strips can also have multiple shapes such as oval, rounded, trapezoidal shapes, etc.

 In addition, the tying of the strips on the roller 22 can be between a few degrees and 180 degrees, however it is preferably between 60 to 130 degrees.

 FIG. 4 schematically represents a sleeping installation.

 We find in this figure the coating station 21 of Figure 3 with the roller 22, the tank 23 containing the mixture 24, the PTFE strip 27, the pre-dosing scraper 29. One of the ends of the strip 27 is fixed to the holding bar 28, a ballast is suspended at the other end of the strip 27.

 The width 25 is a width of light weight paper (about 20 g / m2) with a width of 720 mm. The direction of scrolling of the paper has been symbolized by arrows. At the time of its passage on the pick-up roller 22, the width 25 is coated with approximately 20 g / m2 of the powdered mixture 24. It is coated over its entire width, except on two zones forming longitudinal strips corresponding to the passage of the width 25 on the PTFE strips 26 and 27.

 After the coating step, the thickness of the layer of powdered mixture deposited is then equalized by a metering bar 34 or Meyer bar, the drive system of which allows the direction of rotation of the bar to be chosen.

 The width 25 is maintained under a tension of approximately 3.5 kg on successive cylinders 30, 31, 32 and 33. These cylinders 30, 31, 32 and 33 are heating cylinders, they are maintained at respective temperatures of 64 C, 74 C, 84 C and 84 C. The heating of the width 25 on the cylinders 30, 31, 32 and 33 causes the gradual and controlled evaporation of 10 g / m2 of water contained in the deposited mixture.

 This contact drying can be supplemented by non-contact drying of the infrared or forced air type for example.

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 In addition, the temperatures of the different cylinders can be modified according to the type of coating mixture present.

 The sleeping installations also include strip unfolders, the role of which is to prevent the width 25 from contracting during its drying. A rubber cylinder of curved banana type 36 keeps the width 25 flat and avoids creases.

 The coated and dried web 25 is finally wound in a reel 37.

 Of course, depending on the number of strips devoid of powder that it is desired to form on the width and as a function of their width, the number of PTFE strips positioned on the pick-up roller and their width may be varied.

 FIG. 5 shows an example of a section 100 of paper width 25 which can be obtained by the method described above.

 This width 25 has a width of 720 mm. It has areas covered with powdered layers in the form of four strips 103, 105, 107 and 109 (represented in hatched areas) of respective widths 150, 150, 150 and 75 mm. These four powdered strips are spaced apart by blank strips 102, 104, 106 and 108 50 mm wide. The width 25 is intended to be cut (according to the lines shown in dotted lines in the figure) for the production of sheets of powdered paper of dimensions 100 × 100 mm. Each cut sheet conforms to the sheet shown in Figure 1, it has an application area over a width of 75 mm formed in a portion of coated width and a grip margin over a width of 25 mm formed in a portion of blank width.

 The foregoing description relates to sheets of powdered paper having specific dimensions. It is of course possible thanks to the method of the invention to produce sheets of powdered paper having different dimensions and / or dimensions of powdered areas and different margins.

 Furthermore, the composition of the coating mixture can be varied depending on the product which it is desired to deposit on the paper.

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 This mixture can comprise a binding agent and / or a dispersing agent and / or a rheology regulator and / or an anti-foaming agent and / or active principles.

The fastening of the strip (s) on the take-up roller is advantageously between 1 and 180 degrees, preferably between 60 and 130 degrees
In an implementation of the method described above, after having deposited the mixture on the width, the width passes through a series of heating rollers to cause the evaporation of water contained in the mixture, the amount of water evaporated being preferably between 10 g / m2 and 20 g / m2.

Claims (20)

1. Support paper sheet (1) for the application of cosmetic products impregnated or covered with substance (s) or powder (s) characterized in that it has at least one margin (3) devoid of substance or powder .  2. Sheet of paper according to claim 1, characterized in that it has a basis weight between 10 and 100 g / m2, preferably between 10 and 35 g / m2.  3. Sheet of paper according to one of claims 1 or 2, characterized in that the width of the margin (3) is between 10 and 100 mm.  4. Sheet of paper according to one of claims 1 to 3, characterized in that it is covered with a cosmetic powder in an amount of 1 to 50 gum2, preferably from 1 to 30 gin2.  5. Case (12) characterized in that it contains a stack (11) of sheets of paper according to one of claims 1 to 4.  6. Case (12) according to claim 5, characterized in that it contains a stack of sheets superimposed on each other and joined by their adjacent edge.  7. Case (12) according to claim 5, characterized in that it contains a stack of tangled sheets of paper.  8. Case according to claim 7, characterized in that it comprises a slot (13) through which extends a sheet of paper (15) of the stack (11) and in that the sheet portion s' extending out of the case has at least one margin (3).  9. Method for manufacturing sheets of backing paper (1) for the application of cosmetic product, according to which a mixture (24) containing a cosmetic product is deposited by a pick-up roller (22) on a web (25) of paper, characterized in that at least one strip (26,27) of material having a weak adhesion blocking the roller (22) is positioned between the roller (22) and the width (25), thereby avoiding contact between the <Desc / Clms Page number 12>  roller (22) and the width (25) over at least one zone (102,104, 106,108) of said width (25).  10. The method of claim 9, characterized in that the strip (26,27) of low adhesion material has a variable width.  11. Method according to one of claims 9 to 10, characterized in that the strip (26,27) is made of a material chosen from the following materials: polytetrafluoroethylene, polypropylene, polyethylene or a composition based on copper, of nickel and chromium.  12. Method according to one of claims 9 to 11, characterized in that the take-up roller (22) being driven in rotation in the direction opposite to the direction of travel of the width (25), the strip (26,27) is kept in balance on the pick roller (22) by a ballast (40) suspended at one of its ends.  13. Method according to one of claims 9 to 12, characterized in that several strips (26,27) are placed between the pick-up roller (22) and the width (25) and in that the ends of the strips positioned on the same side of the pick roller (22) are connected to an element (8) maintaining their spacing.  14. Method according to one of claims 9 to 13, characterized in that the fastening of the strip (s) on the pick-up roller is between 1 and 180 degrees, preferably between 60 and 130 degrees.  15. Method according to one of claims 9 to 14, characterized in that the mixing layer is leveled on the pick-up roller (22) by a pre-dosing scraper (29) whose free edge is positioned at a given distance of the surface of the roller (22).  16. Method according to one of claims 9 to 15, characterized in that the mixture (24) comprises a makeup powder and water.  17. Method according to one of claims 9 to 16, characterized in that the mixture comprises a binding agent and / or a dispersing agent and / or a rheology regulator and / or an anti-foaming agent and / or active ingredients . <Desc / Clms Page number 13>  18. Method according to one of claims 9 to 17, characterized in that after having deposited the mixture (24) on the width (25), the width (25) runs through a series of heating rollers (30,31 , 32.33) to cause the evaporation of water contained in the mixture, the amount of water evaporated being between 10 91m2 and 20 g / m2.  19. Method according to one of claims 9 to 18, characterized in that the width (25) is cut into sheets (1) unit.  20. Width (25) of paper, characterized in that it has alternating strips (103,105, 107,109) coated with a cosmetic composition and blank strips (102,104, 106,108).