Method for manufacturing a cleansing and/or care article
The invention relates to the use of a cleansing and/or care composition for impregnating a pile of absorbent supports. The care and cleansing composition has a relatively high apparent viscosity while having a rheological behavior of the shear-thinning and thixotropic type and comprises at least one care and/or cleansing compound. Thus, during an impregnation under stress, especially under pressure and with prior stirring, the composition becomes sufficiently fluid to enable it to rapidly and homogeneously diffuse into the supports arranged in a pile.
1. A method of manufacturing skin care articles comprising:
stacking several absorbent pads on one another;
applying the whole desired volume of a skin care composition, comprising at least one skin care compound, said composition having an apparent viscosity, measured at 20° C. according to the ASTM D 2983 standard, of greater than 80 centipoise and being shear-thinning and thixotropic, to the absorbent pad placed on the top of the stack in the absence of an additional stress to the stack; and
after the application of the skin care composition to the absorbent pad placed on the stack of several absorbent pads, subjecting the stack of several absorbent pads to a stress by the application of a load, thereby impregnating all the absorbent pads of the stack with one application of the skin care composition to the absorbent pad placed on the top of the stack.
2. The method of claim 1 , wherein the skin care composition has an apparent viscosity, measured according to the ASTM D 2983 standard, of greater than 500 centipoise.
3. The method of claim 1 , wherein the skin care composition is comparable to a Bingham plastic until its viscosity reaches a threshold value.
4. The method of claim 1 , wherein the skin care composition, when it is subjected to a shear rate of 20 rpm using a Brookfield tester equipped with an SC4-31 reference spindle and until a threshold value of the viscosity is obtained, has a viscosity η that decreases exponentially according to the equation:
B =−( dη/dt )* t,
the coefficient B being greater than or equal to 0.4, wherein B is a thixotropic destruction temporal coefficient and t is time.
5. The method as claimed in claim 1 , wherein the skin care composition, when it is subjected to a shear rate of 20 rpm using a Brookfield tester equipped with an SC4-31 reference spindle and until a threshold value of the viscosity is obtained, has a viscosity η that decreases exponentially according to the equation:
B =−( dη/dt )* t,
the coefficient B being between 15 and 300, wherein B is a thixotropic destruction temporal coefficient and t is time.
6. The method of claim 1 , wherein the skin care composition has a recovery rate less than or equal to 50%.
7. The method of claim 1 , wherein the skin care composition comprises magnesium aluminum silicate and sodium carboxymethyl cellulose.
8. The method of claim 7 , wherein the skin care composition comprises at least 0.4 wt %, relative to the total weight of the composition, of magnesium aluminum silicate and at least 0.12 wt %, relative to the total weight of the composition, of sodium carboxymethyl cellulose.
9. The method as claimed in claim 7 , wherein the skin care composition comprises at least 0.7 wt %, relative to the total weight of the composition, of magnesium aluminum silicate and at least 0.21 wt %, relative to the total weight of the composition, of sodium carboxymethyl cellulose.
10. The method of claim 7 , wherein the skin care composition comprises at least 0.8 wt %, relative to the total weight of the composition, of magnesium aluminum silicate and at least 0.24 wt %, relative to the total weight of the composition, of sodium carboxymethyl cellulose.