FIELD OF INVENTION
[0001] The embodiment herein generally relates to the field of manufacturing technology. More specifically, the invention provides a process for manufacturing a single piece two layered lid for a water tank, wherein the two layers are non-separable.
BACKGROUND AND PRIOR ART
[0002] Water tanks are used to store water and therefore got domestic as well as commercial applications. Water tanks are used for storing drinking water, irrigation agriculture, fire suppression, agricultural farming, both for plants and livestock and chemical manufacturing. Water tank parameters include the general design of the tank, and choice of construction materials. Water tank mainly comprises of outer tank body and a lid. The lid is the part of the water tank that serves as a closure or seal, usually one that completely closes the water tank. [0003] Conventionally, there are many varieties of lids for closing the water tank. However, the existing lids may not protect the water in the water tank sufficiently enough against contamination and thereby may fail to sustain hygiene condition of the water. Further, after a period of use of water tanks the lid colour may fade and results in poor opacity which in turn causes penetration of ultra violet rays into the water through the lid and thereby results in generation of algae in water. The above situation causes high water contamination and non-healthy consumption of potable water.
[0004] Therefore, there is a need to develop a single piece two layered lid and a process for manufacturing the single piece two layered lid. Further, there is still a need to develop a non-separable single piece two layered lid that provides

protection against ultra violet rays and algae formation and thereby avoids water
contamination.
OBJECTS OF THE INVENTION
[0005] Some of the objects of the present disclosure are described herein below:
[0006] A main object of the present invention is to provide a process for
manufacturing a single piece two layered lid for a water tank.
[0007] Another object of the present invention is to provide a non-separable
single piece two layered lid.
[0008] Still another object of the present invention is to provide a single piece
two layered lid for protecting water in tank against ultra violet rays and algae
formation.
[0009] Yet another object of the present invention is to provide a single piece
two layered lid having longer durability
[00010] Another object of the present invention is to provide a single piece two
layered lid that avoids contamination of the water.
[00011] Another object of the present invention is to provide a single piece two
layered lid with higher durability, where if the lid is made from fresh/virgin
material.
[00012] The other objects and advantages of the present invention will be
apparent from the following description when read in conjunction with the
accompanying drawings, which are incorporated for illustration of preferred
embodiments of the present invention and are not intended to limit the scope
thereof.
SUMMARY OF THE INVENTION

[00013] In view of the foregoing, an embodiment herein provides a process for manufacturing a single piece two layered lid for a water tank. According to an embodiment, the process for manufacturing the single piece two layered lid comprising the steps of injecting a molten plastic material through an injector to a die, wherein said die includes a male portion and a female portion, molding an outer layer of the lid by pressing the male portion of the die with the female portion of the die, wherein the die filled with the molten plastic material, removing said molded outer layer of the lid from the die, placing said molded outer layer of the lid on the female portion; injecting another molten plastic material through the injector to the die, and molding an inner layer of the lid with a pre-determined thickness and within an inner area of the outer layer of the lid by pressing said female portion on the male portion of the die, wherein the die filled with the another molten plastic material and thereby forming single two layered lid.
[00014] According to an embodiment, the molten plastic material is injected to the female portion of the die for molding the outer layer of the lid. According to an embodiment, another molten plastic material is injected to the male portion of the die for molding the inner layer of the lid.
[00015] According to an embodiment, the male portion and the female portion interchanged in position after the molding of the outer layer of the lid. [00016] According to an embodiment, the molten plastic material used to mold the outer layer of the lid is a polypropylene co-polymer (PPCP). According to an embodiment, another molten plastic material used to mold the inner layer of the lid is a high-density polyethylene (HDPE) grade polymer.

[00017] The outer layer and said inner layer of the lid are non-separable.
According to an embodiment, the pre-determined thickness of the inner lid
molded within the inner area of the outer layer of the lid is in a range of 1.0mm to
1.6mm. The outer layer of the lid is other than black colour. The inner layer of the
lid made in black color to protect the lid against ultra violet rays and algae
formation.
[00018] 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
[00019] The detailed description is set forth with reference to the accompanying
figures. In the figures, the left-most digit(s) of a reference number identifies the
figure in which the reference number first appears. The use of the same reference
numbers in different figures indicates similar or identical items.
[00020] Fig. 1 illustrates a general apparatus for manufacturing a single piece two
layered lid, according to an embodiment herein;
[00021] Fig.2 illustrates a flow chart showing a process for manufacturing the
single piece two layered lid, according to an embodiment herein;
[00022] Fig.3 illustrates a perspective view of the single piece two layered lid,
according to an embodiment herein; and

[00023] Fig.4 illustrates a line diagram of the single piece two layered lid, according to an embodiment herein. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [00024] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments 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 embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[00025] As mentioned above, there is a need to develop a single piece two layered lid and a process for manufacturing the single piece two layered lid to provide protection against ultra violet rays and algae formation and thereby avoid water contamination. The embodiments herein achieve this by providing a non-separable single piece two layered lid. Referring now to the drawings, and more particularly to FIGS. 1 through 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
[00026] Fig.l illustrates a general apparatus 100 for manufacturing a single piece two layered lid for a water tank, according to an embodiment herein. The apparatus 100 for manufacturing the single piece two layered lid comprises of an injector 101 and a die 102. The die 102 comprises of a male portion 103 and a female portion 104. The injector is configured for injecting molten plastic material

to the die. The die configured for molding the outer layer and inner layer of the lid using the molten plastic material and by pressing the male portion and female portion of the die together.
[00027] According to an embodiment, a process 200 for manufacturing a single piece two layered lid comprising the steps of: injecting 201 a molten plastic material through an injector 101 to a die 102, molding 202 an outer layer of the lid by pressing the male portion 103 of the die 102 with the female portion 104 of the die, wherein the die filled with the molten plastic material, removing 203 said molded outer layer of the lid from the die 102; placing 204 said molded outer layer of the lid on the female portion 104; injecting 205 another molten plastic material through the injector 101 to the die 102; and molding 206 an inner layer of the lid with a pre-determined thickness and within an inner area of the outer layer of the lid by pressing said female portion 104 on the male portion 103 of the die 102, wherein the die 102 filled with the another molten plastic material and thereby forming single two layered lid.
[00028] According to an embodiment, the molten plastic material is injected to the female portion 104 of the die 102 for molding the outer layer of the lid. According to an embodiment, another molten plastic material injected to the male portion 103 of the die 102 for molding the inner layer of the lid. The male portion 103 and the female portion 104 are interchanged in position after the molding of the outer layer of the lid.
[00029] According to an embodiment, the molten plastic material used to mold the outer layer of the lid is a polypropylene co-polymer (PPCP). According to an embodiment, another molten plastic material used to mold the inner layer of the lid is a high-density polyethylene grade polymer (HDPE) or polypropylene co-

polymer (PPCP). The said outer layer and said inner layer of the lid are non-separable. According to an embodiment, the pre-determined thickness of the inner lid molded within the inner area of the outer layer of the lid is in a range of 1.0mm to 1.6mm. The outer layer of the lid is other than black colour. The inner layer of the lid made in black color to protect the lid against ultra violet rays and algae formation.
[00030] Fig.2 illustrates a flow chart 200 showing a process for manufacturing the single piece two layered lid according to an embodiment herein. [00031] A process for manufacturing the single piece two layered lid; wherein said process comprising of:
[00032] at block 201, injecting a molten plastic material through an injector 101 to a die 102,
[00033] at block 202, molding an outer layer of the lid by pressing a male portion 103 of the die 102 with a female portion 104 of the die 102, [00034] at block 203, removing said molded outer layer of the lid from the die 102,
[00035] at block 204, placing said molded outer layer of the lid on the female portion 104,
[00036] at block 205, injecting another molten plastic material through the injector 101 to the die 102, and
[00037] at block 206, molding an inner layer of the lid with a pre-determined thickness and within an inner area of the outer layer of the lid by pressing said female portion 104 on the male portion 103 of the die 102 and thereby forming single two layered lid.
8

[00038] Fig.3 illustrates a perspective view of the single piece two layered lid
300, according to an embodiment herein. The single piece two layered lid 300
comprises of the outer lid 301 and the inner lid 303. The outer lid is provided with
threads 303 for locking or closing the upper portion of the water tank tightly.
[00039] Fig.4 illustrates a line diagram 400 of the single piece two layered lid
300, according to an embodiment herein. The inner lid layer of the lid is molded
with a pre-determined thickness 304 and within an inner area of the outer layer of
the lid and thereby forms single two layered lid. For, example the pre-determined
thickness is in the range of 1.0mm to 1.6mm.
[00040] A main advantage of the present invention is that the manufacturing
process provides a non-separable single piece two layered lid.
[00041] Another advantage of the present invention is that the manufacturing
process is simple and cost effective.
[00042] Still another advantage of the present invention is that the provided
single piece two layered lid protects water against ultra violet rays and algae
formation.
[00043] Yet another advantage of the present invention is that the provided single
piece two layered lid possess longer durability.
[00044] Another advantage of the present invention is that the provided single
piece two layered lid avoids contamination of the water and helps to sustain
hygienic condition inside the water tank.
[00045] The foregoing description of the specific embodiments will so fully
reveal the general nature of the embodiments herein that others can, by applying
current knowledge, readily modify and/or adapt for various applications such
specific embodiments without departing from the generic concept, and, therefore,

such adaptations 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 embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

We claim:
1. A process for manufacturing a single piece two layered lid 300; wherein said
process comprising the steps of:
injecting 201 a molten plastic material through an injector 101 to a die 102; wherein said die 102 includes a male portion 103 and a female portion 104; molding 202 an outer layer of the lid by pressing the male portion 103 of the die 102 with the female portion 104 of the die 102, wherein the die 102 filled with the molten plastic material;
removing 203 said molded outer layer 301 of the lid from the die 102; placing 204 said molded outer layer 301 of the lid on the female portion 104; injecting 205 another molten plastic material through the injector 101 to the die 102; and
molding 206 an inner layer 302 of the lid with a pre-determined thickness 304 and within an inner area of the outer layer 301 of the lid by pressing said female portion 104 on the male portion 103 of the die 102, wherein the die 102 filled with another molten plastic material and thereby forming single piece two layered lid 300.
2. A process as claimed in claim 1, wherein said molten plastic material injected to the female portion 104 of the die 102 for molding the outer layer 301 of the lid.
3. A process as claimed in claim 2, wherein said another molten plastic material injected to the male portion 103 of the die 102 for molding the inner layer 302 of the lid.

4. A process as claimed in claim 3, wherein said male portion 103 and said female portion 104 interchanged in positions after the molding of the outer layer 301 of the lid.
5. A process as claimed in claim 4, wherein said molten plastic material used to mold the outer layer 301 of the lid is a polypropylene co-polymer (PPCP).
6. A process as claimed in claim 5, wherein said another molten plastic material used to mold the inner layer 302 of the lid is a high-density polyethylene grade polymer (HDPE) or polypropylene co-polymer (PPCP).
7. A process as claimed in claim 1, wherein said outer layer 301 and said inner layer 302 of the lid is non- separable.
8. A process as claimed in claim 1, wherein said pre-determined thickness 304 of the inner layer 302 of lid molded within the inner area of the outer layer 301 of the lid is in a range of 1.0mm to 1.6mm.
9. A process as claimed in claim 1, wherein said outer layer 301 of the lid is other than black colour.
10. A process as claimed in claim 1, wherein said inner layer 302 of the lid made in black color to protect the lid against ultra violet rays and algae formation.