Claims:What is claimed is:
1. A grain polishing roller manufacturing process comprising steps of:
mixing grain and binder solution in predefined quantities for a predefined time period to obtain a mixture;
sieving the mixture;
pressing the sieved mixture with a load weight against a predefined mould structure to obtain a cylinder shaped roller, wherein the load weight is greater than 1.5 ton;
drying the cylinder shaped roller;
heating the cylinder shaped roller for a predefined heating cycle; and
processing the cylinder shaped roller to obtain a vitrified grain polishing roller (10).

2. The process of claim 1, wherein the grain is made from material comprising a black silicon carbide and a green silicon carbide in combination of range 20% to 60% and 22% to 55% respectively.

3. The process of claim 1, wherein the binder solution comprises a dextrin powder and a ceramic mixture.

4. The process of claim1, wherein the cylinder shaped roller which is subjected to the predefined heating cycle has a heating cycle temperature range between 1150 and 1300 degree Celsius.

5. The process of claim1, wherein the vitrified grain polishing roller (10) is suitably grooved (12, 14) to polish, shine and whiten rice grains.

6. The process of claim 3, wherein the binder solution further comprises a mix of ceramic powder.

7. The vitrified polishing roller (10) is obtained or manufactured by the method of claim1.

9. A grain polishing roller comprising:
a grain and a binder solution, wherein the grain and the binder solution are mixed in a predefined quantity for predefined time period to obtain a mixture, wherein the mixture is sieved before pressing said mixture against a predefined mould structure to obtain a cylinder shaped roller, wherein the cylinder shaped roller is heated for a predefined heating cycle and processed to obtain a vitrified grain polishing roller (10).

10. The grain polishing roller of claim 9, wherein the grain is made from material comprising a black silicon carbide and a green silicon carbide in combination of range 20% to 60% and 22% to 55% respectively and the binder solution is made from material comprising a dextrin powder and ceramic mixture.

11. The grain polishing roller of claim 9, wherein the cylinder shaped roller which is subjected to the predefined heating cycle has a heating cycle temperature range between 1150 and 1300 degree Celsius. , Description:BACKGROUND
Technical field
The present invention relates to grain polishing rollers, and more particularly to a rice polishing rollers made from a vitrified process.
Description of the prior art
The objective of a rice milling system is to remove the husk and the bran layers from paddy rice to produce whole white rice kernels that are sufficiently milled, free of impurities and contain a minimum number of broken kernels. The Engelberg huller uses steel rollers to remove the husk. Other types of huller include the disk or cono huller which uses an abrasive rotating disk to first remove the husk before passing the grain to conical rollers which polishes the rice grains. This is done repeatedly since other sides of circular side of rice are not husked. Rubber rollers are very popular and are widely used to reduce the amount of breakage of the grains, so increasing the yield of the best quality head rice. But the rubber rollers tend to require frequent replacement due to wear and tear. These replacements can be a significant drawback due to cumulative cost involved in replacing the rollers often with a new one.

Recently, grain rollers are made through resinoid process which enhances the shelf life of the roller to some extent. However, the shelf life of the roller made through resinoid process is still less to meet the demands of the modern needs. The surfaces of the resinoid rollers are not that uniform and true. This provides moderate whitening, polishing and shining of the rice grains as required by the modern needs. Also seasonal changes in the weather affect the performance of the roller, thereby, reducing the shelf life of the rollers. Therefore, there is a need for a grain polishing rollers made from a new or novel method/process which increases the shelf life of the rollers while also providing good and enhanced whitening, polishing and shining of the rice grains. These rollers should also be less susceptible to frequent wear and tear and require less maintenance.

SUMMARY
In view of the foregoing, an embodiment herein provides a grain polishing roller manufactured from vitrified technology. The manufacturing process comprising steps of: mixing grain and binder solution in predefined quantities for a predefined time period to obtain a mixture, sieving the mixture, pressing the sieved mixture with a load weight against a predefined mould to obtain a cylinder shaped roller, drying the cylinder shaped roller, heating the cylinder shaped roller for a predefined heating cycle, and processing the cylinder shaped roller to obtain a vitrified grain polishing roller. In an embodiment, the load weight may be greater than 1.5 ton.

In an embodiment, the grain is made from material comprising a black silicon carbide and a green silicon carbide in combination of range 20% to 60% and 22% to 55% respectively. In an embodiment, the binder solution may be made from material comprising a dextrin powder. The cylinder shaped roller may be subjected to a heating cycle in a temperature range between 1200 and 1300 degree Celsius. The vitrified grain polishing roller may be suitably grooved to polish, shine and whiten rice grains.

In one embodiment, the binder solution comprises a mix of ceramic powder and epoxy resins.
The grain and the binder are mixed in a predefined quantity for predefined time period to obtain a mixture. The mixture may be then sieved before pressing the mixture against a predefined mould to obtain a cylinder shaped roller. The cylinder shaped roller may be heated for a predefined heating cycle and processed to obtain a vitrified grain polishing roller.

These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
Reference will be made to embodiments of the invention, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments:

Figure 1 illustrates a vitrified polishing roller in accordance with the present embodiment mentioned herein; and

Figure 2 illustrates a process of manufacturing the vitrified polishing roller in accordance with the present embodiment mentioned herein.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Although specific terms are used in the following description for the sake of clarity, these terms are intended to refer only to the particular structure of the invention selected for illustration in the drawings, and are not intended to define or limit the scope of the invention.

References in the specification to “one embodiment” or “an embodiment” member that a particular feature, structure, characteristics, or function described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.

As mentioned, there remains a need for a grain polishing rollers made from a new or novel method/process which increases the shelf life of the rollers while also providing good whitening, polishing and shining of the rice grains. The embodiments of the present disclosure provided herein tries to overcome the limitations of the previous technology or process for manufacturing grain polishing rollers. The embodiments herein provide a grain polishing rollers made from a vitrified process. Now referring Fig. 1 through 2, the various embodiments of the present disclosure is explained in detail.

Figure 1 illustrates a vitrified grain polishing roller 10 in accordance with the present embodiment. The grain polishing roller includes a grain and a binder solution. The grain and the binder solution may be mixed in a predefined quantity for predefined time period to obtain a mixture. The mixture is then sieved before pressing the mixture against a predefined mould to obtain a cylinder shaped roller. The cylinder shaped roller may be heated for a predefined heating cycle and processed to obtain a vitrified grain polishing roller 10.

In an embodiment, the grain may be made from material comprising a black silicon carbide and a green silicon carbide in combination of range 20% to 60% and 22% to 55% respectively. The binder solution may be made from material which includes a dextrin powder.

The vitrified grain polishing roller may be grooved on the surface. The grooved surface may include drop portion 12 and raised portion 14. The combination of the groves 12, 14 may facilitate fine polishing, shining, whitening, etc. of rice. In one embodiment, the grooves may also be termed as “slots”. The slots might wear out in shape while in continuous operation for longer periods.

Figure 2 illustrates a process of manufacturing the vitrified grain polishing roller 10 in accordance with the present embodiment mentioned herein. The complete process of manufacturing the vitrified grain polishing roller 10 is explained with the help of following steps. In step 20, a grain and a binder solution may be mixed together may be in a predefined quantities for a predefined time period to obtain a mixture. In step 22, the mixture is then sieved. In step 24, the sieved mixture may be pressed with a load against a predefined mould structure to obtain a cylinder shaped roller. In an embodiment, the load weight may be greater than 1.5 ton.

In step 26, the cylinder shaped roller may be dried naturally. In one embodiment, the stones may be dried though an industrial process of drying. In step 28, the cylinder shaped roller is heated for a predefined heating cycle. In step 30, the cylinder shaped roller may be processed further to obtain a finished vitrified grain polishing roller 10. In an embodiment, the cylinder shaped roller may be subjected to a heating cycle in the temperature range between 1200 and 1300 degree Celsius.

In an advantages embodiment, the vitrified grain polishing roller doesn’t require frequent dressing to maintain the geometry of the stone. The overall weight of the stone is less due to high density of the material, therefore low electrical load to move the roller 10 which results in higher output rate, electricity saving, etc. The low weight advantage works seamlessly well on variety of rice available and provides better quality output.

In another advantages embodiment, the roller 10 has a longer shelf life, therefore, can be used for years together without the need for replacement. The roller 10 is free from any moisture or weather effects and may be used in all seasons. Thus, various embodiments of the present disclosure propose a novel method to increase the shelf life of the roller, improved efficiency of the roller to polish, whiten and shine the rice and are less susceptible to frequent wear and tear.

It will be apparent to one of the ordinary skill in the art that many modifications, improvements and sub-combinations of the various embodiments, adaptations and variations can be made to the invention without departing from the scope thereof as claimed in the following claims.