DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL SPECIFICATION
(See section 10 and rule 13)

1. TITLE OF THE INVENTION: A SCREENING DEVICE

2. Applicants Detail:
Applicant
Sr. No. Name Nationality Address
1 PARASON MACHINERY (INDIA) PRIVATE LIMITED
INDIA GOLDEN DREAMS, E-27, 4TH FLOOR CHIKALTHANA, MIDC, AURANGABAD, MAHARASHTRA 431006 INDIA
Inventor
Sr. No. Name Nationality Address
1. AKSHAY AMRUTLAL DESARDA INDIA A-1, ARIHANT, SAMARTHA GARDEN, NATH PRANGAN, GARKHEDA, AURANGABAD - 431005

3. Preamble to the description: The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD
The present disclosure relates to the field of screening of pulp from slurry. More particularly, the present invention relates to the screening device intended to separate the pulp.
BACKGROUND
The screening of pulp from a slurry is a crucial process that needs to be performed in various industries including the pulp and paper industry in order to extract fibers from said slurry, wherein said screening of pulp can be processed by means of a screen configured in the basket or other instance can be a device intended to perform said screening of said fiber from said slurry comprising intended size. Whereas said screen comprises the plurality of apertures articulated on a periphery in order to screen said fiber from said slurry feed into said screening devices and said holes articulated on said screen plate can vary in accordance to the plurality of parameters which include but not limits to an application, type of fiber, medium of said slurry, input, and output requirement, etc. Further, as said profile and cross-section of said apertures can change in accordance to the application, type of fiber, medium of said slurry, input, and output requirement, etc., said apertures still an intended part of said screen plate and can’t be eliminated or altered by other means.
Furthermore, as said apertures are the mandatory part of said screen plate and act as a functional aspect of screening quality in order to deliver intended output while sustaining the loads acting of said screen plate. Whereas said screen plate application intended to articulate not only said aperture but also said screen plate by means of high-quality material and manufactured with a more precise quality without increasing the existing cost of said screen plate with sustainability to the plurality of loads acting on said screen plate. Wherein said material requirement and manufacturing process require to articulation of said plurality of aperture interrelated with each other in order to produce said high-quality screen plate with a precise aperture in order to facilitate more refined screening of said fiber from said slurry with increased load-bearing capacity.
However, in said conventional process said screen plates are manufactured by means of material with a low percentage or without percentage of the molybdenum, nickel, and sulfur content as required in order to articulate said apertures swiftly on said screen plate, which leads to producing soft and/or ductile material that demands more power and effort to drill said apertures within said screen plate that are more prone to bending and deformation due to fluctuation apart from intended loading patterns.
Moreover, as no sheet material with said high percentage of molybdenum, Sulphur with low cost as compared to conventional material is available, wherein the material available and used for said screen plate manufacturing are very limited which include but not limits to the SS316, and SS304. Wherein said S31600B comprises 18% chromium, modified with molybdenum Carbon-0.08% Manganese-2.00%, Phosphorus- 0.045%, Sulfur-0.030%, Silicon-1.00%, Nickel-10.0–14.0%, Chromium-16.0–18.0%, Molybdenum-2.00–3.00% with mechanical properties S31600 Tensile Strength, min, ksi (MPa) 75 (515)B, Yield Strength, min, ksi (MPa)A 30 (205), Elongation in 2 in.(50 mm) 30, Reduction of Area, min, % 50, and said S30400B Carbon-0.08% Manganese-2.00%, Phosphorus- 0.045%, Sulfur-0.030%, Silicon-1.00%, Nickel-8.0–11.0%, Chromium-18.0–20.0%, with mechanical properties S30400B Tensile Strength, min, ksi (MPa)75 (515)B, Yield Strength, min, ksi (MPa)A 30 (205), Elongation in 2 in.(50 mm) 30, Reduction of Area, min, % 50. That makes the drilling of said aperture on said screen plate difficult due to high ductility and less machinability to increase machining cost and leads to a bending of sheet during manufacturing operation, which generates the difficulty in performing said drilling operation for said screen plate apertures and articulating profile required to perform said screening of pulp from said slurry.
Hence, there is a technical gap that exists and needs to be alleviated by means of effective and more efficient screening of said pulp from said slurry.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
1. An object of the present disclosure is to manufacture a screen plate from plate type of material.
2. In another object of the present disclosure is to improve machinability,
3. Another object of the present disclosure is to facilitate easy chip formation and drilling capability along with enhanced corrosion resistance,
4. Still another object of the present disclosure is to formulate more uniform grain structure.
5. Still another object of the present disclosure is to reduce production time with respect to manufacturing of said screen plate.
6. Yet another object of the present disclosure is to enhance stress resilience and impact strength.
7. The further object of the present disclosure is to improve mechanical and physical properties.
8. Furthermore object of the present disclosure is to the formulation of sheets of material with Sulphur, Manganese, and Molybdenum in low percentages.
9. Another object of the present invention is the application of material to facilitate good weldability.
10. Moreover, the object of the present invention is to reduce material costs as well as increase the productivity of said screen plate manufacturing.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present invention envisages a screening device comprising, a surface configured with said screening device and an aperture configured with said surface. Wherein said screening device can be manufactured of plate form of material with the composition which includes but not limited to carbon (C) without exceeding 0.05%, silicon (Si) without exceeding 1%, manganese (Mn) without exceeding 2%, phosphorus (P) without exceeding 0.2%, sulphur (S) without exceeding 0.2%, chromium (Cr) without exceeding 18%, molybdenum (Mo) without exceeding to 2.5% and nickel (Ni) without exceeding to 11.5% of the total material composition of said screening device.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A screening device the present disclosure will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates a screening device,
Figure 2 illustrates an aperture,
Figure 3 illustrates said aperture,
Figure 4 illustrates said aperture.
LIST OF REFERENCE NUMERALS:
Numerals References
100 Screening device
101 Surface
102 Aperture
102a Straight aperture
102aa Cutting edge
102b Countersunk aperture
102ba Cutting edge
102c Taper aperture
102ca Cutting edge
102d Profiled aperture
102da Cutting edge
102e Diamond aperture
102ea Cutting edge
102f Bean aperture
102fa Cutting edge
102g Oval aperture
102ga Cutting edge
102h Kidney aperture
102ha Cutting edge

DETAILED DESCRIPTION
The present invention discloses a screening device (100) as shown in figure no. 01, said screening device (100) can be a device with a plurality of apertures (102) manufactured with the plate form of raw material which includes but not limits to a screen plate, sieve, or other type of screening devices (100). In one of the preferred embodiments said screening device (100) can be a screen plate. Wherein said screening device (100) as said screen plate comprising a plurality of apertures (102) articulated on a surface (101) of said screening device (100) in order to filter the fiber and impurity from the slurry. Wherein said apertures (102) are an important part of said screening device (100) in order to perform the intended function. Further, said screening device (100) without said apertures (102) cannot perform the intended function of said filtering of said fiber and said impurity from the slurry. Said screening device (100) articulated of said plethora of apertures (102) required to be formulated of said surface (101) of said screening device (100) by using operations which include but not limited to drilling, milling with drilling, laser cutting, waterjet cutting etc. and the efficacy and efficiency of performing said operation based on material and tool wear as the more efficient will be the machining and/or drilling operation more efficient will be the manufacturing of said screening device (100) and screen made of said screening device (100). Wherein said machinability and/or drilling operation are based on parameters which include but not limited to manufacturing material type, ingredient of material, ductility of processed material, chip formation, the strength of the material, tool wear rate, speed feed of operation, etc. However, the material with the plate form and better chip geometry with less tool wear ratio can be a vital parameter to increase the production capacity and operational performance of said screening device (100). Whereas in order to increase said machinability and/or drilling operation based on parameters which include but not limits to manufacturing material type, ingredient of material, ductility of processed material, chip formation, the strength of the material, tool wear rate, speed feed of operation, material removal rate and flow, etc. In one of preferred embodiment the form of the plate form of material can be composed of at least alloys which include but not limits to the Sulphur (S), Molybdenum (MO), and Manganese (Mn) with a balanced amount of Nickel (Ni). Wherein said alloys Sulphur (S), Molybdenum (MO), and Manganese (Mn) with a balanced amount of Nickel (Ni) can be a vital one for said screening device (100) formation with said apertures (102) and operating to perform said screening of pulp from slurry in said pulp & paper industry, as said high sulphur (S) as an alloying element and further inclusion of Molybdenum (Mo) along with said balanced nickel (Ni) improves pitting corrosion resistance at a lower cost. Furthermore, sulphur (S) along with manganese (Mn) forms the manganese sulphide (MnS) compound, which causes chip-off more readily during machining to assist in easy machining and drilling operation that can induce the production of said screening device (100) and achieve a more-smooth surface finish to streamline the removal of said chips, that further can be more suitable for application where material with high machinability and corrosion resistance is required, wear and tear of tools can be almost 49-52% lower in comparison to SS 316L when majorly in the fabrication of various component involving machining typically used in various process industry segment.
In another embodiment said Sulphur (S), Molybdenum (Mo), Nickel (Ni) and Manganese (Mn) can be compounded with other materials or base materials in order to articulate a stable material. Wherein iron (Fe) can be used as a base material and carbon (C) can be added as an impurity and a hardening agent as the impurity of carbon in said Iron stops the dislocation of said iron (Fe) atoms in the lattice from sliding past one another. The amount of said carbon (C) impurity can be used to control the hardness, ductility, and tensile strength in the plurality of the commercial steel alloy. Further, said increasing carbon (C) content increases hardness and strength and improves hardenability, but carbon also increases brittleness and reduces weldability because of its tendency to form martensite thus said carbon (C) percentage can be limited up to 0.03 % to 0.05% max in order to maintain ductility and weldability of said material. Further, said screening operation required more rotational strength and resistance to cater to particles and ingredients of said slurry and if said material is required to offer more elevated performance, said material can include corrosion and wear resistance along with enhanced pitting and hardness that can make said material scratch-proof to perform said screening operation an alloy that can facilitate said property will be chromium (Cr), wherein said chromium (Cr) integrated with said carbon (C) and said iron (Fe) and explored to oxidizing media that said pulp and paper industry generally generate due to oxygen. In said oxidizing media said chromium forms an oxide called as chromium oxides as a self-repairing passive layer on the surface of said material and forms a corrosion resistance along with increasing the hardenability of said material and making said material harder, and tougher. Further said self-repairing layer of said chromium oxide also makes the grain finer and makes said material resistant to scratching, staining, rusting, and denting. Wherein said resistance increases as more amount of said chromium (Cr) is added. In the case of stainless steels (SS) have a minimum of 10.5% Chromium (traditionally 11 or 12%) wherein looking into present application and strength requirement the percentage of said chromium (Cr) can be increased from 16.5 % to 17%. Whereas an excess amount of said chromium (Cr) could cause excessive hardness and cracking in and adjacent to welds. As said chromium (Cr) added with said formulation of said iron (Fe), carbon (C) an inclusion of said nickel (Ni) can be important because said nickel (Ni) act as an austenite stabilizer and widens the austenite region and contracts the ferrite region in steel and formulates ferrochromium to produce alloys especially characterized by their high resistance to corrosion and oxidation in order to improves the resistance against the corrosion and oxidation at elevated temperatures. Furthermore, said nickel (Ni)improves the toughness and strength by refining the grain and enhances important properties which include but not limits to formability, weldability, and ductility, impact strength with a reduction in brittleness. In one of embodiment said nickel (Ni) forms a thin layer of nickel oxide that acts as a barrier to prevent the occurrence of further corrosion or provides corrosion resistance property thus the percentage of said nickel can be maintained in high constrain along with said chromium from 10.5 to 11%. However, phosphorus (P) and silicon (Si) can be added in above said formulation in small amounts as said phosphorus (P) is usually added with sulphur (S), wherein said phosphorus (P) prevents the sticking of light-gauge sheets to improve machinability as well as increases strength to articulate said formulation as free cutting steel (SS). Whereas, an excess percentage of said phosphorus (P) has a detrimental effect on corrosion resistance and increases the tendency of the material to crack during welding. Thus, the percentage of said phosphorus (P) can be controlled up to 0.04 % only. However, said silicon (Si) used as a de-oxidising (killing) agent in the melting of steel, and as a result said formulation can contain a small percentage up to 0.5% max. whereas in another embodiment said silicon (Si) addition increases the strength of dual-phase steels after annealing and slow cooling because of the formation of a high volume of homogeneous austenite of high hardenability, leading to a high volume of martensite in the final structure.
Moreover, in another embodiment said formulation can include the composition in the rage of sulphur (S) 0.1-0.2%, Molybdenum (MO) 1.75-2.5%, Manganese (Mn) 0-2%, Chromium (Cr) 16.5-18%, Nickel (Ni) 10-11.5%, Silicon (Si) 0- 1%, Phosphorus (P) 0-0.2%, Carbon (C) 0.03-0.05 % max, and Nitrogen (N2) 0-0.02% with Iron (Fe) to balance remaining ingredient percentage can be processed by means of HRAP (Hot Rolled Annealed & Pickled) as during hot working processes of said formulation an oxide layer (referred to as “scale”, due to the scaly nature of its appearance) develops on the surface of said metal and removal of these oxides helps to restore the inherent corrosion resistance of said metal. Further, Pickling solutions can be applied by immersing said metal can be performed by means of a bath of acidic solution, spraying the surface or applying small amounts of a pickling paste with a paintbrush in order to remove impurities, rust, and scale from the surface of said material in order to achieve the mechanical properties at least Tensile strength can be in the range of 490-550 MPa, Yield strength 205 MPa, Elongation minimum 40%, Hardness (HRB) 95, Hardness (HRW) 217 in plate grade of material.
In another embodiment copper (Cu) can be included in the above formation in the range of 1% to 2.5% in order to enhance the mechanical properties which include but not limits to machinability, corrosion resistance, etc. In one of the preferred embodiments, copper (Cu) can be 1.5% of the total volume of material composition.
In another embodiment said ingredient level can fluctuate in the below-said range of formulation and microscopic structure:
C Si Mn P S Cr Mo Ni N2
Min 0.03 -- -- -- 0.10 16.00 1.75 10.0 --
Max 0.05 1.00 2.00 0.20 0.20 18.00 2.50 11.5 0.02
Preferred range 0.03 0.26 1.88 0.02 0.12 17.97 2.00 11.06 0.02

Microscopic images (Longitudional section)

Grain flow Parallel to Rolling direction (Sulphide inclusions are dark color)

500x Sulphide inclusions in an austenitic matrix. 500x hardness on matrix 249 Hv
Microscopic images (Cross section)

100X cross section 200X CD - Sulphide inclusions are seen

500x Sulphide inclusions in austenitic matrix. 500x hardness on matrix 223 Hv
In another embodiment as shown in figure no. 02 to 04; said aperture (102) can be plurality of type which include but not limits to a straight circular type aperture (102a) with a cutting edge (102aa), a countersunk type aperture (102b) with a cutting edge (102ba), a taper type aperture (102c) with a cutting edge (102ca), a profiled type aperture (102d) with a cutting edge (102da), a diamond type aperture (102e) with a cutting edge (102ea), a bean aperture (102f) with a cutting edge (102fa), an oval type aperture (102g) with a cutting edge (102ga) and a kidney type aperture (102h) with a cutting edge (102ha). Wherein said apertures (102) can be selected in a manner to form a larger cutting edge (102aa, 102ba, 102ca, 102da, 102ea, 102fa, 102ga, 102ha) to increase the screen efficiency and efficacy for said screening device (100). In one of the embodiments said profiled type aperture (102d), said diamond type aperture (102e), said bean aperture (102f), said oval type aperture (102g), and said kidney type aperture (102h) can be articulated in a manner said cutting edge (102da, 102ea, 102fa, 102ga, 102ha) can form a larger side said apertures (102) articulated on said surface (101) in line with a cutting or screening direction of said screening device (100). In one of the preferred embodiments said cutting edge (102da, 102ea, 102fa, 102ga, 102ha) can be formulated in a rotating direction of said screening device (100) in order to perform said screening operation swiftly without generation of restriction to the rotation of said screening device (100) and blockage with reduce the power consumption requirement.
TECHNICAL ADVANCEMENTS
The present disclosure described hereinabove has several technical advantages including, but not limited to, said formulation of manufacturing of said screening device that:
• Said high sulphur (S) as an alloying element and inclusion of molybdenum (Mo) with balanced nickel (Ni) improves pitting corrosion resistance.
• Furthermore, sulphur (S) along with manganese forms the manganese sulphide (MnS) compound, which causes chip-off more readily while machining to facilitate easy machining and drilling operation.
• Said easy machining induces the production of said screening device with an enhanced surface finish.
• Said material for said screening device (100) can be articulated in sheet form without edge cracking.
• Said material caters as free machining steel to facilitate better machinability and drilling performance.
• Inclusion of alloys such as chromium (Cr) and nickel (ni) formulate the self-oxide layer to offer corrosion resistance, scratch resistance, toughness and impact strength to articulate said material more suitable for said screening application.
• Increases resilience to stresses produced in manufacturing or working conditions.
• Better production rate reduces the production cost.
• More impact strength and toughness.
• Enhance mechanical and physical properties.
• More refined grain structure.
• Less cost.
The embodiment herein and the various features and advantages details thereof are explained with reference to the non-limiting embodiment in the following descriptions. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiment herein, the examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiment herein. Accordingly, the examples should not be constructed as limiting the scope of the embodiment herein. The foregoing description of the scientific embodiment will so fully revel the general nature of the embodiment herein that others can, by applying current knowledge, readily modify and / or adapt for various application such as specific embodiments without departing from the generic concept, and, therefore, such adaptions and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments.
It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiment those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the spirit and scope of embodiment as described herein.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of the any other element, integer or step, or group of elements, integers or steps.
The use of the expression “at least” or “at least one” suggested the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or result.
Any discussion of documents, acts, materials, devices, articles, or the like that has been included in this specifications is solely for the purpose of providing a context for the disclosure, it is not to be taken as an admission that any or all of these matters from a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiment, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the forgoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

Dated this 18th day of February 2023
Shailendra Omprakash Khojare,
IN/PA-4041
Applicants Patent Agent

,CLAIMS:CLAIMS
We claim;
1. A screening device (100) comprising;
a surface (101) configures with said screening device (100),
an aperture (102) configured with said surface (101),
characterize in said screening device (100) can be manufactured of plate form of material with composition which includes but not limited to carbon (C) without exceeding 0.05%, silicon (Si) without exceeding 1%, manganese (Mn) without exceeding 2%, phosphorus (P) without exceeding 0.2%, sulphur (S) without exceeding 0.2%, chromium (Cr) without exceeding 18%, molybdenum (Mo) without exceeding to 2.5% and nickel (Ni) without exceeding to 11.5% of the total material composition of said screening device (100).
2. The screening device (100) as claimed in claim 1; wherein said screening device (100) can be a device with a plurality of apertures (102) manufactured with the plate form of raw material which includes but not limited to a screen plate, sieve.
3. The screening device (100) as claimed in claim 1; wherein said screening device (100) can be a screen plate.
4. The screening device (100) as claimed in claim 1; wherein said plethora of apertures (102) required to be formulated of said surface (101) of said screening device (100) can be performed by using operations which include but not limits to drilling, milling with drilling, laser cutting, waterjet cutting.
5. The screening device (100) as claimed in claim 1; wherein said screening device (100) includes at least alloys which include but not limits to the Sulphur (S), Molybdenum (MO), and Manganese (Mn) with a balanced amount of Nickel (Ni).
6. The screening device (100) as claimed in claim 1; wherein said screening device (100) includes at least alloys which include but not limits to the Sulphur (S), Molybdenum (MO), and Manganese (Mn) with a balanced amount of Nickel (Ni).
7. The screening device (100) as claimed in claim 1; wherein said screening device (100) includes the composition with the sulphur (S) 0.2%, Molybdenum (MO) 2.5%, Manganese (Mn) 2%, Chromium (Cr) 18%, Nickel (Ni) 11.5%, Silicon (Si)- 1% max, Phosphorus (P) 0.2%, Carbon (C) 0.05 % max and Nitrogen (N2) 0.02%.
8. The screening device (100) as claimed in claim 1; wherein said screening device (100) includes at least alloys with composition Sulphur (S) 0.1%, Molybdenum (MO) 1.75%, chromium (Cr) 16%, Nickel (Ni) 10% and Carbon (C) 0.03 %.
9. The screening device (100) as claimed in claim 1; wherein said screening device (100) includes the composition with the sulphur (S) 0.12%, Molybdenum (MO) 2%, Manganese (Mn) 1.88%, Chromium (Cr) 17.97%, Nickel (Ni) 11.06%, Silicon (Si)- 0.26%, Phosphorus (P) 0.02%, Carbon (C) 0.02 % and Nitrogen (N2) 0.02%.
10. The screening device (100) as claimed in claim 1; wherein said screening device (100) can include the composition of copper (Cu) in the range of 1% to 2.5%.
11. The screening device (100) as claimed in claim 1; wherein said screening device (100) can include the composition of copper (Cu) of 1.5% of the total volume of complete material composition.
12. The screening device (100) as claimed in claim 1; wherein said screening device (100) can include the iron (Fe) in the balanced condition in order to complete the material composition and fulfill the application requirements.
13. The screening device (100) as claimed in claim 1; wherein said aperture (102) can be of type a straight circular type aperture (102a), a countersunk type aperture (102b), a taper type aperture (102c), a profiled type aperture (102d), a diamond type aperture (102e), a bean aperture (102f), an oval type aperture (102g) and a kidney type aperture (102h).
14. The screening device (100) as claimed in claim 1; wherein said profiled type aperture (102d), said diamond type aperture (102e), said bean aperture (102f), said oval type aperture (102g), and said kidney type aperture (102h) can be articulated in a manner a cutting edge (102da, 102ea, 102fa, 102ga, 102ha) can form a larger side said apertures (102).
15. The screening device (100) as claimed in claim 1; wherein said cutting edge (102da, 102ea, 102fa, 102ga, 102ha) can be formulated in a rotating direction of said screening device (100).
Dated this 18th day of February 2023
Shailendra Omprakash Khojare,
IN/PA-4041
Applicants Patent Agent