EP3938089A1 - Machine for treating cosmetic powders - Google Patents
Machine for treating cosmetic powdersInfo
- Publication number
- EP3938089A1 EP3938089A1 EP20717716.3A EP20717716A EP3938089A1 EP 3938089 A1 EP3938089 A1 EP 3938089A1 EP 20717716 A EP20717716 A EP 20717716A EP 3938089 A1 EP3938089 A1 EP 3938089A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- milling
- chambers
- powders
- machine according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims abstract description 78
- 239000002537 cosmetic Substances 0.000 title claims abstract description 15
- 238000003801 milling Methods 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 9
- 239000002245 particle Substances 0.000 description 30
- 239000000047 product Substances 0.000 description 16
- 239000000203 mixture Substances 0.000 description 10
- 230000000712 assembly Effects 0.000 description 9
- 238000000429 assembly Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000000049 pigment Substances 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
- 238000004452 microanalysis Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000000454 talc Substances 0.000 description 3
- 229910052623 talc Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229920001661 Chitosan Polymers 0.000 description 1
- 206010053317 Hydrophobia Diseases 0.000 description 1
- 241001508691 Martes zibellina Species 0.000 description 1
- 206010037742 Rabies Diseases 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940008099 dimethicone Drugs 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004533 oil dispersion Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004846 x-ray emission Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/10—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in stationary drums or troughs, provided with kneading or mixing appliances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/53—Mixing liquids with solids using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/60—Mixing solids with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/805—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis wherein the stirrers or the receptacles are moved in order to bring them into operative position; Means for fixing the receptacle
- B01F27/806—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis wherein the stirrers or the receptacles are moved in order to bring them into operative position; Means for fixing the receptacle with vertical displacement of the stirrer, e.g. in combination with means for pivoting the stirrer about a vertical axis in order to co-operate with different receptacles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/85—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with two or more stirrers on separate shafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/45—Closures or doors specially adapted for mixing receptacles; Operating mechanisms therefor
- B01F35/453—Closures or doors specially adapted for mixing receptacles; Operating mechanisms therefor by moving them perpendicular to the plane of the opening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/7548—Discharge mechanisms characterised by the means for discharging the components from the mixer using tilting or pivoting means for emptying the mixing receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/98—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/21—Mixing of ingredients for cosmetic or perfume compositions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0436—Operational information
- B01F2215/0472—Numerical temperature values
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0436—Operational information
- B01F2215/0481—Numerical speed values
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
- B02C18/10—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged above container
Definitions
- the present invention relates to a machine for processing powders, more in particular cosmetic powders, optionally coated, and a process for producing these powders.
- the present invention concerns a machine that allows even finer milling (micronization) of a raw product already in powdery form as well as mixing powders of different kinds.
- the machine according to the invention also allows coating of said cosmetic powders, i.e., applying a liquid coating to the finely pulverized particles.
- these equipment provide for initial milling carried out with micronizers or jet mills, while mixing and further reduction of the size of the powders is conducted with rotor mixers.
- the powders are then generally coated with pigments in turbo-emulsifier devices, inside which said powders are maintained under pressure and agitated by means of air flows.
- the costs of quality control which are high as this is continuous in each step, but also as it involves constant maintenance of the various machines to maintain the quality at suitable levels at all times, as a high quality standard is required in all operations carried out by the various machines.
- the machine according to the present invention is also advantageous as, in addition to the aforementioned operations, it is also capable of coating the particles of powder with suitable pigments.
- Yet another advantage lies in the fact that with the machine according to the present invention it is possible to obtain powders having fundamental properties, such as size, shape and surface area, that are improved relative to those of the powders obtained with the prior art.
- These properties are essential for those technologies that define the powder cosmetically, i.e., slip, miscibility, hygroscopicity, compressibility, sedimentation speed and wettability, which in turn influence important parameters, such as the rheological properties of the suspensions and emulsions and the possibility of obtaining homogeneous mixtures and of maintaining this homogeneity through time. All the technological properties that define the powder then depend on these features.
- a further advantage of this machine is that during the processing of components the temperature remains relatively low; this does not cause the problems that normally occur using conventional mills, i.e., clustering of the particles, hence increase of particle sizes and potential risk of alteration of the components used.
- the subject of the present invention is a machine for mixing and milling powders, in particular cosmetic powders, said machine comprising a body defined at least by side walls and a bottom wall and, preferably, a lid.
- Said body comprises at least two milling chambers communicating with one another; each chamber houses a rotor comprising at least one blade.
- Each chamber is an environment for milling the powders, more in particular for micronization of these powders.
- milling machine it being understood that it is also suitable for mixing and optionally also for carrying out other operations, such as coating the powder particles with suitable coatings.
- Each milling chamber internally defines a milling volume.
- Each milling chamber is preferably globally cylindrical in shape, with substantially vertical sides walls, while the bottom wall and the lid are substantially horizontal.
- the two or more milling chambers are, preferably, identical in size, in particular with reference to the diameter.
- At least one milling chamber can have a different size from the at least one other milling chamber.
- the milling chambers preferably extend in height. More precisely the diameter (D) and the height (H) of the chamber are in a D/H ratio ranging from 0.5 to 1.3 and more preferably from 0.6 to 1.2.
- the rotor is, preferably, positioned centrally in said chamber. More precisely, this rotor is arranged so that its axis coincides with that of the milling chamber.
- the machine can have a lid, preferably completely separable from the body.
- the lid also performs the function of hermetically closing the milling environment formed by the at least two chambers.
- said rotor is connected to the lid. More in detail, said rotor extends from the lid downward into the milling chamber.
- the rotor comprises a shaft rotating along a substantially vertical axis and at least one blade supported by said shaft. If the milling chambers have identical sizes, preferably the rotors of the chambers are identical to one another in shape and size. According to an embodiment of the present invention, the shaft of the rotor does not come into contact with the bottom wall of the respective chamber, hence leaving a space between the free end of the rotor and said bottom wall. In any case, this distance is not large as also the powder placed on the bottom wall can be involved in the mixing and milling process of the machine according to the present invention.
- each rotor supports at least one blade.
- the blade has the following features, taken individually or in any combination thereof:
- - a thickness that varies, preferably, from 1 to 6 mm, more preferably from 1 to 5 mm, even more preferably from 2 to 4 mm;
- the aforesaid length L of the blade is understood as the distance of the point farthest from the axis of the rotor, substantially equal to the radius of the circumference described by the blade during rotation.
- said at least one blade, positioned inside the chamber is, typically, at a height (h) not too far from the bottom wall, i.e., at a height such that the vortex caused by the rotational movement of the blade is also capable of involving the powder placed on the bottom wall.
- the h/H ratio between said distance (h) of the lower blade from the bottom and the height (H) of the chamber ranges from 0.02 to 0.25.
- said blade or at least one blade has a length such that the particles of powder close to or in contact with the side walls of the body are also involved in the rotational movement created by the blade so that they too are subjected to the processing operations performed by the machine according to the present invention.
- the blades can have features of thickness, length, etc., different from or the same as one another.
- the blades can be arranged in various ways along the shaft. For example, all the blades are substantially coplanar or arranged at different levels along the shaft. At each level there can be a single blade or an assembly of two or more blades. The blades at the same level are, preferably, coplanar.
- the blades are arranged so as to form a series of blades along the shaft, arranged singularly or, preferably, in groups.
- the levels are spaced regularly from one another.
- Two assemblies of adjacent blades on a same shaft are, preferably, at a distance (1) such that the 1/H ratio, where (H) is the total height of the chamber, preferably ranges from 0.02 to 0.40.
- Two blades or two assemblies of blades positioned at adjacent levels on a same shaft can be aligned with one another along the vertical, or not. In the latter case, the blades or the assemblies of blades are, more preferably, angularly staggered from one another. If there are two pairs of blades, these pairs are, preferably, orthogonal to each other.
- this positioning of the blades or of the assemblies of blades in adjacent rotors is such that the blades or the assembly /assemblies of blades of a first rotor is/are positioned staggered relative to the blades or to the assembly /assemblies of blades of the adjacent rotor.
- two adjacent rotors can be different from or the same as each other with regard to length of the shaft, number of assembly of blades, orientation of the blades, features of the blades, i.e., number of blades, their thickness, length, etc.
- two adjacent cylindrical milling chambers have a distance between centres of less than the sum of the radii of said two chambers.
- said distance between centres (I) has a value such that the I/D ratio, where (D) is the diameter of the chamber, ranges from 0.35 to 0.85, more preferably from 0.5 to Therefore, according to the present invention, two adjacent milling chambers have a configuration such that the cylinders are not complete but are partially superimposed on one another. Therefore, two adjacent milling chambers of the machine according to the present invention substantially have the shape of an 8.
- the milling chambers define therebetween an area of intersection by means of which the two adjacent chambers are in fluid communication, so that in this area of intersection the flows of powders coming from the two adjacent milling chambers intersect and move from one chamber (first chamber) to the adjacent chamber (second chamber), as in this area there is no fixed obstacle that opposes the passage of material from one chamber to the other.
- the intersection of the two flows of powders not only allows a flow to pass through the flow it intersects, but also entails a collision between particles also of the two flows that intersect. This collision occurs between particles that move at high speed and, therefore, contributes to cause the particles to take the desired final size and shape. In fact, the collisions cause events such as crushing and rounding of the particles, contributing, in addition to the action of the blades, in helping to obtain powders with particles of the desired size and shape.
- Said area of intersection is delimited by two cusps. This area of intersection has a width that depends on the diameter of the adjacent chambers.
- each shaft comprises two assemblies of blades, directly connected to the shaft, where each assembly of blades consists of two pairs of blades.
- the blades of each pair are coplanar and are opposite each other relative to the axis of the rotor.
- the first pair of lower blades and the second pair of upper blades are arranged orthogonally to each other in a plane orthogonal to the axis of rotation of the rotor.
- the arrangement of the blades toward the end of the shafts, hence closer to the bottom of the chambers, allows triggering of internal flows of the powder which enable complete remixing of the powder and prevent stagnant areas.
- the at least one motor can be housed on the lid, in particular on its upper surface, or a part thereof.
- the machine has no lid and comprises a supporting element placed above the milling chambers, which supports the rotors and optionally the at least one motor and from which said rotors extend downward inside the milling chambers.
- This rotation speed in combination with the geometry and the arrangement of the blades and with the shape and the arrangement of the mixing chambers described above, triggers phenomena of impact of the particles with the blades and of particles against one another that enables said particles both to reduce their size considerably, to a level of micronization, and to take the desired final shape.
- the ideal range of rotation speeds is also a function of the capacity of the machine, i.e. of its dimensions, in particular of the diameter of the milling chambers and, hence, of the length of the blades.
- machines with blades having a limited maximum operating diameter (DL) require a higher number of revolutions to operated correctly and ensure the above-mentioned effects.
- the machine also comprises a cooling system that prevents the temperature inside the machine according to the present invention from becoming too high.
- a cooling system that prevents the temperature inside the machine according to the present invention from becoming too high.
- the temperature inside the mixing chambers it is preferable for the temperature inside the mixing chambers not to exceed 90° C and preferably 80° C.
- This system includes cooling means located, for example, along the side walls of the body of the machine, to allow a cooling fluid to circulate. These means can be configured as a serpentine or, more preferably, a sleeve or a gap attached at the level of the walls of the body of the machine.
- the lid is mounted on supporting means provided with actuator means that allow the lid, optionally supporting at least one motor, or the rotors, or both, to be opened and closed easily.
- the machine is equipped with one or more distribution devices of a liquid adapted to generate an atomized jet of a liquid inside the mixing chambers.
- Said distribution device can be used to wet the powders with a liquid, typically a pigment, to perform the coating operation of the particles.
- Said process comprises a stage of filling the mixing chambers with at least one powder product, where said powder product comprises at least one substance that can be used to produce a cosmetic product.
- This process further comprises at least one of the following stages:
- the process for carrying out only milling (micronizing) of a homogeneous powder or of pre-mixed powders provides for operation of the rotors at a speed ranging from 1000 rpm to 4000 rpm for a time ranging from 5 to 10 minutes.
- the aforesaid parameters can also be maintained in the case in which the milling stage also comprises the mixing of different powders, where said powders are placed in the milling chambers simultaneously before the machine is switched on.
- the machine can be operated constantly or, if necessary, said step can be carried out in several sub-steps spaced apart by pauses of a few minutes (from 1 to 5 minutes) to allow the material to rest and cool.
- the product obtained from the process of the present invention can be a semi-finished or a finished product.
- the product is ready to directly undergo the compaction step, i.e., it is no longer necessary for the product to undergo an intermediate sieving step before the compaction step.
- the total process time inclusive of the mixing and crushing steps and of the subsequent coating step is of around 30 minutes, compared to the almost 24 hours required with machines and processes according to the prior art.
- processing steps with the machine of the invention are carried out in sequence without having to move the material from the milling chambers.
- FIG. 1 represents a perspective view of a machine according to the present invention, in a configuration at rest;
- Fig. 2 represents a side view of the machine of Fig. 1;
- FIG. 3 represents a top view of the machine of Fig. 1;
- FIG. 4 shows a sectional side view of the machine of the present invention, in operating configuration
- Fig. 5b is a plan view of the rotors and of the blades
- Fig. 6 represents a diagram of a process carried out with the machine according to the present invention.
- FIG. 7a - 71, 8a - 8n show electron microscope images of samples of powders analysed after some comparative tests conducted with the machine of the present invention
- Fig. 9 is a graph deriving from analyses conducted on samples of materials processed with the machine of the present invention.
- an open milling machine according to the present invention is indicated as a whole with 10.
- the sizes indicated relate to a machine with a capacity (amount of proces sable material) up to 80 kg.
- machine according to the invention can be produced with different sizes/capacities, lower or higher, and its characteristic dimensions are identified according to the size ratios cited above.
- Said machine 10 comprises a body 1 delimited by side walls 2, a bottom wall 3 and, opposite this, a lid 13; these elements define a single environment inside which two milling chambers 11, 12, each globally cylindrical in shape, are positioned.
- the two chambers are identical in size.
- Each chamber has a diameter D of 550 mm, while the distance between centres I of the two chambers 11, 12 is of 350 mm.
- the distance between centres (I) and the diameter (D) are in a ratio of 0.65.
- the height (H) of the chambers is instead of around 800 mm.
- said two chambers 11, 12 are in communication with each other in an area of intersection 20 delimited by two cusps 26, 27.
- Each chamber 11, 12 is provided with a rotor 4, 5, which rotates along a substantially vertical axis at the rotation axis of each chamber 11, 12.
- the lid 13 is completely separable and completely closes the two chambers 11, 12.
- the lid 13 supports, on the upper side, two motors 23, 24 and, on the lower side, the two rotors 4, 5.
- the rotors are identical to each other in shape and size.
- Each rotor 4, 5 is formed of a shaft 21, 22 and two assemblies of blades connected directly to the shaft.
- Each assembly of blades consists of two pairs of blades 21a, 21b, 22a, 22b.
- the shafts 21, 22 do not come into contact with the bottom wall 3.
- the bottom wall of the chamber and the free end of the shafts 21, 22 are at a distance that generally varies from 5 mm to 30 mm.
- the blades of each pair are coplanar and are opposite each other.
- the first pair of blades 21a is arranged at the level or in proximity of the free or lower end of the shaft 21.
- the second pair of blades 21b is arranged above the first pair of blades 21a at a distance of 55 mm.
- first pair of blades 21a and the second pair of blades 21b are arranged orthogonally to each other in a plane orthogonal to the rotation axis of the rotor.
- the first pair of blades 22a is arranged at a distance of 45 mm from the free end of the shaft 22.
- the second pair of blades 22b is arranged above the first pair of blades 22a at a distance of 55 mm.
- first pair of blades 22a and the second pair of blades 22b are arranged orthogonally to each other in a plane orthogonal to the rotation axis of the rotor.
- the shaft 21 has pairs of blades 21a, 21b positioned at a level that is different from the level of the pairs of blades 22a, 22b of the shaft 22.
- the orientation of the blades of the first pair of blades 21a is identical to that of the first pair of blades 22a.
- the orientation of the blades of the second pair of blades 21b is identical to that of the second pair of blades 22b.
- the lid 13 is mounted on supporting means 14 and is moved by hydraulic or pneumatic actuators 16 that enable the lid to be moved according to needs.
- the machine comprises a pair of nozzles 25 mounted on the lid 14 and configured to direct an atomized jet of a liquid downward, i.e., into the milling chambers.
- Said nozzles 25 are preferably fed by a pumping device, not visible in the figures.
- the number of nozzles can vary according to requirements, for example there can even be two, three or more for each milling chamber.
- the machine of the present invention is capable of carrying out various operations on the powders inserted therein, in particular milling, more in particular micronizing, mixing and, optionally, also coating, without it being necessary to move them to distinct specific machines for said operations.
- the machine according to the present invention enables a process (illustrated in Fig. 5) to be carried out to prepare, for example, a foundation powder in a single stage introducing the necessary powders, not yet micronized, into the mixing chambers, to obtain the desired mixture.
- the base powders such as talc, com starch
- the pigments, the binder system, the preservative agents, any other raw materials are introduced into the chambers.
- the semi-finished product obtained can be subsequently processed in the same machine with suitable coating agents that are introduced later, i.e., after the mixing and crushing stage. At the end of this process, a homogeneous finished product ready for the compaction step is unloaded.
- a mixture of various powders and also coated powders with good features can be obtained; in particular the mixture of powders has greater homogeneity relative to a mixture of the same type of powders obtained by means of a process that uses prior art equipment; consequently, the former also has very good slip, i.e., it is easier to spread on a surface relative to the latter.
- the texture of the first mixture of powders is also better compared to the second; this is also important in the case of powders for use in the cosmetic sector.
- the first mixture has a better final stability relative to that of the second mixture.
- the product obtained has a better overall quality relative to that of the product obtained with a process that uses prior art equipment.
- the greater homogeneity of the size of the particles of the mixture means that the sieving stage of the powder before its compaction step is superfluous, making the process of the present invention faster and simpler relative to those of the prior art.
- the machine used for comparison is a mixer/mill model MC4 manufactured by VE.TRA.CO GROUP, (hereinafter conventional mill) commonly used for the preparation of cosmetic powders, in particular to conduct the mixing and coating steps.
- the machine according to the invention used had a capacity of 5 kg and was equipped with milling chambers having a diameter (D) of 200 mm and a height (H) of 210 mm.
- micro structural characterization was carried out using a high resolution Scanning Electron Microscope (SEM, TESCAN Mira 3 XMU) operating at 8 kV.
- Microanalysis was performed using X-ray emission spectrometry (Energy Dispersive Spectrometry EDS, ED AX), operating at 20 kV.
- the samples were previously coated with platinum (for microstructural characterization) or with carbon (for microanalysis) respectively using the Cressington HR208 or Cressington 208c instrument.
- the commercial raw material Talc M5 has a mean diameter as indicated in the respective technical data sheets, more precisely of around 26 pm.
- Figs. 7a to 71 show some images of the samples detected under the microscope. The images are carried out at different levels of magnification indicated in the image itself. For each imagine the related sample analysed is indicated.
- the sample T5 NM is the one that, in a global vision, has a larger component of particles of smaller sizes.
- the sample T5 has the particles with the largest sizes.
- the samples T5 VM and T5 NM both have particles of smaller sizes relative to the unprocessed sample T5 but it can be noted that the sample T5NM has a larger component of particles of very small sizes.
- Figs. 8a to 8n show some images of the samples detected under the microscope. The images are taken at different levels of magnification indicated in the image itself. For each image the related sample analysed is indicated.
- the particles have a finer/thinner lamellar structure relative to the samples L569 VM and L579 VM processed with the conventional mill.
- This feature of the particles allows improved adhesion to the skin, as well as giving the powder a superior feeling to the touch.
- the oxide processed is a“yellow iron oxide” pigment.
- the table below indicates the various samples analysed corresponding to unprocessed oxide, only milled with the machine of the invention and milled and coated with various elements. Table 3
- the attached Fig. 9 instead shows a graph indicating whether processing with coating agents led to modifications of the sample.
- the variation of the elements of greater interest (C, O, Si, Fe) is expressed as ratio relative to the content in the sample as is. Therefore, the more the ratio is close to or the same as the value 1 the more the samples are similar. From the attached graph it can be seen that only the milling process with the machine of the invention does not cause variations of the main elements, namely Iron, Oxygen and Silicon.
- the graph also shows that the coating process with Silane and Dimethicone, which both contain Silicon, leads to an increase in the content of this element respectively of 17 and of 22%, showing that coating has taken place.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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IT102019000003749A IT201900003749A1 (en) | 2019-03-14 | 2019-03-14 | MIXING MACHINERY FOR POWDERS |
PCT/IB2020/052239 WO2020183413A1 (en) | 2019-03-14 | 2020-03-12 | Machine for treating cosmetic powders |
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EP3938089A1 true EP3938089A1 (en) | 2022-01-19 |
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EP20717716.3A Pending EP3938089A1 (en) | 2019-03-14 | 2020-03-12 | Machine for treating cosmetic powders |
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EP (1) | EP3938089A1 (en) |
IT (1) | IT201900003749A1 (en) |
WO (1) | WO2020183413A1 (en) |
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CN112705092A (en) * | 2020-12-04 | 2021-04-27 | 江西亚航科技有限公司 | A raw materials flash mixed device for frit production |
IT202100032078A1 (en) * | 2021-12-21 | 2023-06-21 | La Saponaria S R L Soc Benefit | IMPROVED MIXER FOR SOAP PRODUCTION. |
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DE417549C (en) * | 1925-01-16 | 1925-08-11 | Josef Halsig A | Refining machine for chocolate |
CH382130A (en) * | 1958-12-12 | 1964-09-30 | Hercules Powder Co Ltd | Method and apparatus for the continuous manufacture of nitrocellulose |
US4256407A (en) * | 1975-12-16 | 1981-03-17 | Maurice Seiderman | Culinary mixer and disintegrator |
KR101723145B1 (en) * | 2016-08-22 | 2017-04-05 | 배서준 | Apparatus for manufacturing oil-water mixed fuel |
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