FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by
The Patent (Amendment) Act, 2005
&
THE PATENTS RULES, 2003
As amended by
The Patent (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A COMPOSITION OF PIGMENT MASTERBATCH AND THE PROCESS OF MANUFACTURE THEREOF
APPLICANT
Name: SUBHASHCHANDRA K TIBRIWAL
Nationality: Indian
Address: 202, Brij Bhumi, Nehru Road, Vile Parle East, Mumbai 400057, MAH, India
INVENTOR
Name: ADITYA S. TIBRIWAL
Nationality: Indian
Address: Brij Bhumi, 2nd Floor, Nehru Road, Vile Parle East, Mumbai 400057, MAH, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present invention relates to a process for the preparation of a Pigment Masterbatch and a composition thereof.
The present invention also relates to a process for the preparation of a Pigment Masterbatch wherein the pigment loading is of a high percentage with excellent dispersability and low micron size of pigment.
BACKGROUND AND PRIOR ART OF THE INVENTION
Masterbatch is a solid or liquid additive for plastic used for coloring plastics (Color Masterbatch) or imparting other properties to plastics (Additive Masterbatch).
Masterbatch is a concentrated mixture of pigments and/or additives encapsulated
during a heat process into a carrier resin which is then cooled and cut into a granular
shape.
Masterbatch allows the processor to colour raw polymer economically during the
plastics manufacturing process.
Conventionally, for coloring polymers, the manufacturers use ready products from color manufacturers. The most common product forms sold by the color manufacturers are pre-colored resins or color concentrates. Color concentrates contain a high concentration of pigments or dyes in a carrier system. Such color concentrates are mixed by the plastic manufacturer with uncolored polymer and are then manufactured into semi-finished products or final products. The color concentrates are commonly used in pelletized form (also known as master batches) or liquid form (also known as liquid color).
The color concentrates, either in liquid form or in the pellet form (Masterbatch) have to be mixed with the uncolored resin in a particular ratio in order to achieve the desired color. The mixing can be done either by manual mixing, or, more commonly, by a process using automated dosing equipment.
A problem related with liquid color concentrates is, that the liquid carrier can have a negative impact on the physical properties of the polymer. Further disadvantage of liquid colors compared to Masterbatches, is that of more difficult handling, the cleaning of the machine between color changes, and the processing of the liquid color. However, the coloring costs with liquid colors are lower compared to Conventional Masterbatches.
For most plastic manufacturers, the use of Masterbatches is the preferred method for coloring of plastics. Ease of handling and low costs compared to pre-colored resins are the main advantages for these products. The compatibility of Masterbatches with the resin is excellent, since the carrier material of the Masterbatch is in most cases identical with the resin.

Masterbatches are commonly supplied in pellet form. There are few ways to produce a Masterbatch. The most common preparation is as follows 15-25% pigment + 40-55% fillers such as Calcium Carbonate, Talc, Fly Ash etc + Balance Liner Low Density Poly Ethylene (LLDPE) + Additives for various applications.
Known processes involving incorporation of pigment into polymers have problems like reaglomaration of pigments, carbon formation, poor flow, non uniform dispersion and distribution of pigment, non universal, cannot be used along with various polymers and use of extensive apparatus.
Patent CN102675709 describes a process of preparation of Masterbatch wherein the Color Masterbatch comprises the following components of, by weight, 60%-70% of a thermoplastic resin, 5%-10% of an additive and 25%-30% of a pigment. The process involves mixing - Blanking - melt compounding - Cooling - diced - dry - packaging mixing of pigment with thermoplastic polymer under high temperatures and twin screw extruder and cooling.
The disadvantage of this invention is that it due to high pressures and temperatures created in the process and the sheer tends to degrade the thermoplastic and there is carbon formation in thermoplastic during the process, resulting in poor flow of material and not as good a dispersion of pigment. This process would also require heavy machinery and capital.
US Patent 8,613,800 proposes a process of Pigment preparation in platelet form which can be incorporated efficiently in the application media and does not show tendency of overheating. (This is a pigment preparation, for further use of manufacturing of Master Batch/Printing Ink/ etc.)
The disadvantages of this process are higher colouring costs and use of additional apparatus. Requires various stages of preparations and thus increases the cost of production and also degradation of material because of multiple processes. Requires further process to convert into master batch which would result in double process, It has been widely noted that a product as thermoplastic, pigment, additives when are subject to heat and pressure are subject to degradation of certain percentage.
Prior Art United States Patent 8,481,614, discloses a process of Masterbatch preparation by producing a masterbatch or polymer improver by heating a wax or polymer with a low temperature and mixing the molten wax with additives, including pigments, at a low temperature above the congealing point of the wax to create a carrier material. This process involves mixing pigment with molten wax and then cooling. There are many process disadvantages in this invention as there is additional power consumption and loss of material weight. Also there is no control on the micron size of the pigment thus affecting the dispersion properties and tinting strength of the master batch resulting in higher dosage of master batch and increased cost.
Another disclosure is made by CN103289184, describing a preparation method and application of the anti-oxidative color masterbatch. The anti-oxidative color masterbatch disclosed by the invention has the advantages of good uniformity, good stability, good processability, good mobility and good heat and weather resistance. The brightness of colors of the plastic products can be increased, and the fading time of the plastic products can be delayed. This process is for creating an anti-oxidant

master batch thereby improving the thermal stability of the polymer along with coloring of the same.
The disadvantage/ problem of this invention is that the main property of a masterbatch are to achieve excelled pigment color values and color strength with high dispersion properties. Both these properties are limited and the pigment dispersion is not uniform because the process involves the use of high temperature and pressure resulting in degradation of material and re-agromalation of pigment. Further this also leads to carbon formation of Thermoplastic used which decreases the flow of the material during the usage of material resulting in lesser production and more choking of filters. Also this type of manufacturing requires heavy machinery and capital to manufacture.
EP2740752 provides a biodegradable master batch and a preparation method thereof. The biodegradable master batch is prepared by in-situ polymerization of the components. The invention discloses preparation of the biodegradable polymer master batch having good dispersion effect and excellent interface bonding property. This relates to a procedure to make bio degradable master batch and is different as compared to our Masterbatch.
US Patent 8,513,344 discloses a Masterbatch for coloring a synthetic resin of the present invention includes an aluminium pigment, a polyethylene wax, and a linear low-density polyethylene resin, and the masterbatch in a form of cylindrical pellets, each 2.5 mm in diameter and not less than 2 mm and not more than 5 mm in height. The aluminium pigment used for the present invention is not particularly limited. For example, a flake-like aluminium pigment having an average particle size of approximately 5 to 250 mu.m may be used. The aluminium pigment may be obtained through any process of manufacture. Aluminium powder which is a raw material for the pigment may be set into a wet state by an organic solvent such as mineral spirit in a ball mill, and steel balls may be used to wet-grind this aluminium powder to produce an aluminium pigment or the like to be used. This patent is specifically for manufacturing master batch for metallic color.
The disadvantage of this invention is the lengthy process involving many stages of manufacture.
US Patent 2011251303 discloses an invention of pigment granules that comprise one or more flake-form effect pigments, polymer particles or polymer particle mixtures, adhesion promoters, antioxidants and optionally additives. A process for the preparation of pigment granules comprises mixing one or more flake-form effect pigments, one or more polymer particles, at least one adhesion promoter, at least one antioxidant and optionally one or more additives with one another simultaneously or successively. The pigment granules may be employed as a mixture with plastic powders or as a mixture with plastic granules for use in masterbatch applications.
To overcome these problems and disadvantages of the prior art, the present invention offers a simple one-step process with a novel composition that incorporates high dosage of pigment with low micron size and excellent dispersabilty. Also the same master batch can be used for various applications such as blow moulding, extrusion,

and cast film with wide acceptability of polymers such as HDPE/ PP/ EVA/ PVC/ CPP/ NYLON/ ABS/ STRYRENE etc.
The present invention thus offers significant advantages like
• Lower cost of production
• Lower power consumption
• Pigment size of less than 2-3 microns
• Higher pigment loading
• Lower dosage of Masterbatch used
• Low colouring cost
• Increased dispersion of pigment
• Increased Pigment Color Values and Tinting Properties
• Increased polymer strength
• Universal in application, can be used with various polymers
• Less choking of filters and less frequent change of filters
• Negligible carbon formation, degradation and re-agromalation of pigment and carrier
• Finished product has high gloss and enhanced colour values
OBJECTS OF THE INVENTION
It is an object of the present invention to provide a process for the preparation of a Pigment Masterbatch to provide a single step manufacturing system to achieve excellent results and low cost of manufacturing as well as lower power consumption.
It is another object of the invention to provide a process for the preparation of a Pigment Masterbatch which is universal in application and can be used with various polymers.
It is yet another object of the invention to provide a process for preparation of Pigment Masterbatch wherein high to very high doses of Pigment loading can be achieved.
It is an object of the present invention to provide a process for the preparation of a Pigment Masterbatch to achieve Pigment size of less than 2-3 microns thereby giving uniform coloring and better color values and better dispersability.
It is another object of the present invention to provide a process for the preparation of A Pigment Masterbatch to achieve Pigment in form of flakes and thereby giving increased dispersion of the pigment.
It is yet another object of the present invention to provide a process for the preparation of a Pigment Masterbatch wherein low doses of Masterbatch are required as compared to Conventional Masterbatch preparations.

It is an object of the present invention to provide a process for the preparation of a Pigment Masterbatch wherein lower doses of pigment are used, thereby increasing polymer strength.
It is another object of the present invention to provide a process for preparation of Pigment Masterbatch to provide increased flow of plastic processing leading to less choking of filters and thereby less frequent change of filters and increased productivity
It is yet another object of the invention to provide a process for preparation of Pigment Masterbatch that has nil or negligible carbon formation, degradation and re-agromalation of pigment and carrier during the process of manufacture.
It is an object of the present invention to provide a process for the preparation of a Pigment Masterbatch that has fine pigment size resulting in better dispersion and transparency of colour with enhanced colour values and gloss of final product.
It is an object of the present invention to provide a master batch that increases the flow of polymer and thereby increases the production.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a process for preparation of
Pigment Masterbatch with ingredients comprising:
a) Pigment
b) Co-polymer
c) Polyethylene Wax
d) Additives /Minerals
e) Dispersing Agents.
According to another aspect, there is provided a process for preparation of Pigment Masterbatch which is a single step process, comprising of
a) Mixing the mentioned ingredients at defined temperature to which the
Pigment,
Minerals, and other additives are added and a homogenous loaf is created.
b) The loaf is then further processed at defined temperature through a specialized
apparatus.
According to a further aspect there is provided the process a process for preparation of Pigment Masterbatch wherein the use of the specialized apparatus helps in achieving the desired micron size of the pigment in flake-form.
According to yet a further aspect there is provided the process for preparation of Pigment Masterbatch wherein the shape of final product can be changed by using the same flake form of the pigment.

According to the present invention, there is provided a process for preparation of Pigment Masterbatch wherein the pigment loading can be increased to very high doses thereby requiring less quantity of Masterbatch.
According to another aspect of the present invention, there is provided a process for preparation of Pigment Masterbatch wherein the pigment flakes can be used directly as Masterbatch or can be converted into pellets form.
According to a further aspect of the present invention, there is provided a process for preparation of Pigment Masterbatch wherein the wax can be selected from low melting point to very high melting point depending on the Masterbatch to be used finally in selected polymer/ co-polymers having specific acrylate value for the choice of pigment used.
According to yet another further aspect of the present invention, there is provided a process for preparation of Pigment Masterbatch wherein the specialized apparatus is used to not only achieve desired uniform pigment particle size but thereby giving very high dispersion and enhanced colour values
According to yet another further aspect of the present invention there is provided a process and combination of preparation of Pigment Masterbatch wherein the same can be universally used with various polymers and Process Methods.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a process for the preparation of a Pigment Masterbatch and a composition thereof.
The present invention particularly relates to a process for the preparation of a Pigment Masterbatch wherein the pigment loading is of a very high percentage and fine micron size with excellent dispersability.
The present invention also relates to a process and combination of Master Batch which can universally be used along with various polymers and Processing Methods thereon.
The present invention describes a process for preparation of Pigment Masterbatch with ingredients comprising:
a) Pigment
b) Co-polymer
c) Polyethylene Wax
d) Additives /Minerals
e) Dispersing Agents in Fixed ratios w/w.
The invention also describes a single step process using specialized apparatus for preparation of the Pigment Masterbatch thereby offering desired uniform pigment particle size and very high dispersion and enhanced colour values

The invention thereby allows the preparation of Cost-effective Masterbatches as well
as
Lowering the Masterbatch quantity to be used in the final process and hence saving on
coloring cost of Polymer.
The invention describes a novel process of mixing Co-polymer and Polyethylene Wax in a Sigma Mixer/Mixtruder at defined temperature of 100° C for about 10 minutes and then the Pigment, Minerals, and other additives are added to the mixture and a homogenous loaf is created. The same is mixed further for about 10 minutes depending upon the dose of the pigment loading.
The mixture thus obtained is then further processed in Hot Loaf form at temperature of about 70 ° C through the specialized apparatus called triple roll mill "TRM".
The use of this specialized apparatus helps in achieving the pigment size of less than 3 microns in form of flakes.
The Pigment flakes formed on the TRM is the final product; the shape of the final product can be changed with further process.
Pigment masterbatch can be the form of pellets, flakes, with enhanced loading of the
pigments, having particles size up to 3.0 micron
The Pigment loading is or can be very high doses up to 80-90 % w/w.
The Wax (specifically a PE/PP/EVA Wax) can be selected from low melting point to very high melting point depending on the Masterbatch to use finally.
The Co-polymers either Ethylene Methyl Acryalate having specific acrylate value can be chosen depending on the choice of pigment used. Ethylene Vinyl Acetates with specific Vinyl Acetate content can be chosen. These can also be a Polyolefin, Polyesters, Polyamides, Polyacrylates, Polycarbonates, Polyurethanes, Polystyrenes and Homopolymer, Co-Polymer etc. or a combination thereof.
The Pigment can be Liquid Pigment, Organic Pigments, In Organic Pigments, AZO Pigments, Phthaylocyanine Pigments, Carbon Black, Titanium, Chromes, Aluminium Pastes, Bronze Powders, Pearl, Chromes etc. or a combination of pigments.
Filler and additives can be dispersion agents, petroleum wax, stearic acid, minerals. UV stabilizers, HALS, Optical Brighteners, etc. or a combination of additives...
The main advantages of the process are achievement of uniform pigment particle size of less than 3 Microns there by giving very high dispersion and enhanced colour values.
The Flakes can then be used directly as Masterbatch or can be converted into pellets form.
The significant advantages of the present invention are:
a) The Masterbatch produeed by the inventive process is universal in application

and can be used with various polymers such as PP/ PE/ ABS/ Styrene / EPS/ Nylon/ PVC.
The Masterbatch produced by the inventive process can be used in Blow, Injection, Cast, Tubing, T Die, Tape Plant, Foam Film etc
The Masterbatch can be made with high to very high pigment loading. For example in Titanium loading, the dosage can be as high as 90%.
Lower dosage of Pigment Masterbatch increases the polymer strength.
The Masterbatch produced by the inventive process increases the flow of the plastic processing and thereby reduces the back pressures on the extruders by almost 10% with low dosage of 0.50-1.00%.
Increased flow has resulted in less choking of filters and lesser frequent change of filters.
Single step process to achieve excellent results and low cost of manufacturing as well as lower power consumption.
Increased production by almost 7-8% in extruders.
The Masterbatch produced by the inventive process has negligible carbon formation, degradation and re-agromalation of pigment and carrier during the process of manufacture.
The Masterbatch produced results in better tinting or coloring properties of pigment and wherein the a product made with 33% pigment loading is used almost 1 part as compared to 6 parts of regular master batch with approx 20% pigment loading, as such the effective pigment consumption is lowered by approx 75%.
Calculation of Pigment Used to Color 100 Kgs of Polymer

Conventional Master Batch Our Master Batch
Master Batch Used 2.00% 2000 Grams 0.30% 0300 Grams
Pigment % 15-20% 300-400 Grams 33% 0100 Grams

Data for Yellow 13 Pigment Masterbatch.

EXAMPLES
Example 1 :
a. 400 Grams of Ethylene Vinyl Acetate Co-polymer Acetate content of 18%
From DuPont (Or similar Grades from Other Manufacturers) and 740 Grams
Of Polyethylene Wax Clariant PE520 grade (Or similar grades from other
manufacturers) are mixed in a Sigma Mixer/Mixtruder at defined temperature
for approx. 10 Minutes at 100° Centigrade, after the mixture reaching the
softening point
b. 990 Grams of Pigment Blue 15:1 from Claraint (or similar grade from other
manufacturer), 550 Grams Uncoated Calcium Carbonate, 450 Grams of
Titanium RE15 (PowerChem Chemicals Ltd) 15 Grams of Stearic Acid (Godrej Chemicals), 3 Grams Fumed Silica (Cabot Ltd) are added to the same
and a homogenous loaf is created. The same is mixed further for approx. 7
Minutes till a uniform loaf is created.
c. The Pigment Particle size and color values are checked at this stage to match
the standards.
d. The above mixture is then further processed in hot loaf form at temperatures
approx 70° Centigrade through the TRM, there by achieving micron size of
Pigment of Less than 3 Microns giving excellent dispersion to the pigment.
e. The Pigment Particle size is once again checked after this stage.
f. The flakes formed on the TRM is the final product, the shape of the final
Product can be changed with further process.
Example 2 :
a. 250 Grams of Ethylene Vinyl Acetate Co-polymer Acetate content of 18%
From DuPont (Or similar Grades from Other Manufacturers) and 625 Grams
of Polyethylene Wax Clariant PE520 grade (Or similar grades from other
manufacturers) are mixed in a Sigma Mixer/Mixtruder for approx. 10 Minutes
at 100 degree Centigrade, after the mixture reaching the softening point
b. 2000 Grams of Titanium Dioxide (PowerChem) and Optical Brightener 15
Grams (Glow), 200 Grams Calcium Carbonate, 50 Grams Stearic Acid and
3 Grams Fumed Silica R-972 was added to the above
c. The same was left to mix for approx 6 minutes in the Sigma Mixer and
temperatures were raised; to 120 degree Centigrade.

d. The Loaf from c above was passed through TRM to form flakes.
Example 3 :
a. 1100 Grams of Ethylene Methyl Acyralate (DuPont Elvaloy 34035) and 1400
Grams of EVA 3 Wax (BASF) are mixed in a Sigma Mixer/Mixtruder for
approx. 10 Minutes at 120 degree Centigrade, after the mixture reaching the
softening point
b. 2500 Grams of Carbon Black N550 from Aditya Birla Nuvo and Optical
Brightener 15 Grams (Glow) , 50 Grams Stearic Acid and 3 Grams Fumed
Silica R-972 was added to the above
c. The same was left to mix for approx 6 minutes in the Sigma Mixer and
temperatures were raised to 130 degree Centigrade.
d. The Loaf from c above was passed through TRM to form flakes.
TESTS
A) Particle size is checked with the help of Microscope of 1500x zoom, the Average particle size is checked.
B) Softening Point of the final product is checked with the help of VCAT/HDT Testing equipment.
C) Color is matched using a spectrophotometer and getting the L.A.B. Values of the shade
D) Tinting strength is checked at .03% of the masterbatch and 99.97% of polymer and the same is checked with the help of Spectrophotometer
E) Melt Flow is checked on a melt flow tester along with the final polymer to be
used or individually to maintain the melt flow index of the product.
F) Moisture Content is checked on Aquatrac 3E
COMPARISON TABLES:
Following Comparative Charts were made.
A) PIGMENT DISPERSION:
1)
Conventional Master Batch Our Master Batch
Master Batch Used 2.00% 2000 Grams 0.30% 0300 Grams
Pigment %
15-20% 300-400 Grams 33% 0100 Grams

Data for Yellow 13 Pigment Masterbatch. Composition : 100 Kgs PP + 8 Kgs Calcium + Masterbatch

Conventional Master Batch Our Master Batch
Master Batch Used 1.00% 1000 Grams 0.50% 0500 Grams
Pigment % 65% 650 Grams 70% 0350 Grams
A
Data for White TI02 Pigment Masterbatch. Composition : 100 KgS PP + 10 Kgs Calcium + Masterbatch

B) GLOSS OF POLYMER:

Conventional Master Batch Our Master Batch
Master Batch Used 2.00% 2000 Grams 0.50% 0500 Grams
GLOSS at 20° 59.5 74.2 (UNIT)
,
Data for Yellow 13 Pigment Masterbatch. Composition : 100 Kgls PP + 5 Kgs Calcium + Masterbatch

C) POLYMER STRENGTH:

Conventional Master Batch Our Master Batch
Master Batch Used 2.00% 2000 Grams 0.50% 0500 Grams
Tensile Strength 100 psi/kgf 110 psi/kgf
1000 Denier 4 mm Strip After Stretching used for PP Woven Sack 4.9 psi/Kgf 5.0 psi/Kgf
Data for Yellow 13 Pigment Masterbatch. Composition : 100 Kgs PP + 5 Kgs Calcium + Masterbatch

D) FLOW OF POLYMER IN EXTRUDER BARREL :

Conventional Master Batch Our Master Batch
Master Batch Used 2.00% 2000 Grams 0.50% 0500 Grams
Flow Pump
Output
Pressure 173 160
Data for Yellow 13 Pigment Mastcrbatch.
Composition : 100 Kgs PP + 10 Kgs Calcium + Masterbatch
MAC Pump RPM 45
It will be readily apparent to one skilled in the art that varying substitutions and modifications may be made to the invention disclosed herein without departing from the spirit of the invention. Thus, it should be understood that although the present invention has been specifically disclosed by the preferred embodiments and optional features, modification and variation of the concepts herein disclosed may be resorted to by those skilled in the art, and such modifications and variations are considered to be falling within the scope of the invention.
It is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including' "comprising," or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. It must be noted that, as used in this specification and the appended claims, the singular forms "a," "an" and "the" include plural references unless the context clearly dictates otherwise.

CLAIMS :
We Claim:
1) A Pigment Masterbatch Composition comprising of
a) Pigment
b) Co-polymer
c) Polyethylene Wax
d) Additives /Minerals..
e) Dispersing Agents
Wherein the Pigment loading is or can be very high doses up to 80-90 % w/w.
2) A Pigment Masterbatch Composition according to claim 1 wherein the particle size is less than 3.0micron.
3) A Pigment Masterbatch Composition according to claim 1 wherein the dispersibility of the masterbatch composition is up to 33% per 100 grams.
4) A Pigment Masterbatch Composition according to claim 1 wherein the gloss Of the composition is 74.2 (UNIT).
5) A Pigment Masterbatch Composition according to claim 1 wherein the Pigment is selected from liquid pigments, organic pigments, inorganic pigments, AZO pigments, phthaylocyanine pigments or carbon black.
6) A Pigment Masterbatch Composition according to claim 1 wherein the Co-Polymer is selected Ethylene Methyl Acrylate Co-Polymers having specific Acrylate value or Ethylene Vinyl Acetates with specific Vinyl Acetate content, or can be chosen from Polyolefin, Polyesters, Polyamides, Polyacrylates, Polycarbonates, Polyurethanes, Polystyrenes or Homo-polymer.

7) A Pigment Masterbatch Composition according to claim 1 wherein Additives/ Minerals can be stearic acid, talc, mica, calcium carbonate, glass, optical brightener, anti static agents, flame retardants, asbestos, UV stabilizers, UV absorbers, radium.
8) A Pigment Masterbatch Composition according to claim 1 wherein the Dispersing Agents can be chosen from EBS(Ethylene Bis Steramide), EVA3
Wax.
9) A process for the manufacture of Pigment Masterbatch Composition
Comprising of :
a) single-step mixing of the co-polymer and polyethylene wax in Sigma ' Mixer/Mixtruder at temperature about 1000 C for about 10 minutes and then

adding the pigment, minerals, additives to obtain a homogenous loaf.
b) mixing further for about 10 minutes depending upon the dose of the pigment loading;
c) rolling the Hot Loaf form at temperature of about 70 degree Centigrade through the specialized apparatus called "Triple Roll Mill"
d) extruding the composition obtained in (c) through Triple Roll Mill to obtain flakes