DESC:FIELD OF INVENTION
[0001] The present invention relates to the field of packaging technology, specifically to a polymer-based moulded canister intended for storing and dispensing a wide range of carbonated and non-carbonated beverages. The invention particularly addresses the design, material composition, and structure of the canister which enables it to withstand internal pressure due to carbonation while offering full recyclability and significant sustainability advantages over conventional packaging solutions.
BACKGROUND OF THE INVENTION
[0002] The current global push towards sustainable manufacturing and environmental stewardship has catalysed a revaluation of existing packaging materials and systems. With climate change and plastic pollution emerging as critical global challenges, regulatory bodies, consumers, and companies are being held to higher standards of responsibility regarding the lifecycle of their products. Among the most prominent contributors to environmental degradation are single-use packaging materials, especially metallic and non-recyclable components used in the beverage industry.
[0003] Traditionally, carbonated beverages are stored and transported in aluminium cans due to their ability to withstand pressurization. However, aluminium processing involves high energy consumption, generates a significant carbon footprint, and consumes substantial quantity of water. Furthermore, aluminium cans present issues such as metallic taste, potential corrosion with beverage contents especially alcoholic and acidic formulations, and visual opacity which limits consumer engagement with the product. Although aluminium is technically recyclable, the practical infrastructure and energy requirements for effective recycling are lacking in many countries, leading to long-term accumulation in landfills.
[0004] Moreover, existing polymer containers for carbonated beverages can often fail under carbonation pressure, if not reinforced by complex design elements, leading to safety and integrity issues. The typical reinforcement elements include structural designs such as petalloid bases, which can add weight, cost, and aesthetic limitations. In contrast, this invention proposes a novel approach that integrates sustainability, functionality, aesthetics, and cost-effectiveness. It aims to deliver a packaging solution that not only withstands internal carbonation pressure but is also compatible with existing filling and seaming machinery. Additionally, the invention introduces a polymer-based canister that utilizes materials such as, but not limited to, polyethylene terephthalate (PET) and recycled polyethylene terephthalate (rPET), which are known for their high recyclability. These materials can be repeatedly reprocessed by resin manufacturers, thereby supporting a self-sustaining system aligned with the principles of a fully circular economy and significantly reducing environmental impact and carbon footprint.
[0005] Conventional PET bottles fail to address the needs of carbonation and hot-fill applications without complex bottom geometries (e.g., petalloid designs) and additional reinforcement, often affecting aesthetics, stackability, and recyclability. Therefore, there exists a compelling need for a mono-material polymer packaging system that is recyclable, structurally resilient to pressure, thermally tolerant, and visually appealing. The present invention addresses these limitations by providing a structurally optimized polymer canister that withstands carbonation pressure, endures hot-filling conditions, and is seamed using standard aluminium EOE lids without leakage.
[0006] The inventive design incorporates specific structural adaptations such as a ridged concave base and a custom neck designed for compatibility with conventional aluminium easy-open lids, enabling cross-material integration without compromising the canister’s seal integrity.
OBJECTIVE OF THE INVENTION
[0007] The primary objective is to develop a fully recyclable, polymer-based canister capable of withstanding the high internal pressures generated by carbonated beverages, thereby providing a sustainable and cost-effective alternative to conventional aluminium cans, which have higher carbon footprints and environmental impact.
[0008] Another objective is to support circular economy goals by facilitating the use of widely recyclable polymers such as, but not limited to PET or rPET that can be effectively collected and reprocessed, minimizing landfill accumulation, reducing dependency on resource-intensive aluminium production, and contributing to global efforts toward eco-friendly packaging solutions.
[0009] Another objective is to enable improved consumer experience and enhanced product safety through a uniquely designed canister structure, incorporating a ridged concave bottom for pressure handling, an easy open end neck compatible with standard aluminium and other metal lids, and transparent body options for visual appeal, branding flexibility, and verification of the integrity of beverage contents.
[0010] Yet another object is to extend packaging utility to hot-fill and retort beverages by leveraging polypropylene-based variants of the invention that maintain form integrity up to 121°C.
[0011] An additional object is to allow modularity in volume, ranging from 150 mL to 1 L, and flexibility in form factors to suit a range of beverages, including carbonated energy shots, flavoured milk, sparkling water, and alcoholic drinks.
SUMMARY OF THE INVENTION
[0012] The following summary is provided to facilitate a clear understanding of the new features in the disclosed embodiment and it is not intended to be a full, detailed description. A detailed description of all the aspects of the disclosed invention can be understood by reviewing the full specification, the drawing and the claims, and the abstract, as a whole.
[0013] The invention discloses a fully moulded canister made from recyclable polymer, primarily intended for packaging carbonated beverages. It includes three core structural components: an Easy Open End Neck, a robust Body designed to withstand internal pressure, and a specially contoured Ridged Concave Bottom that counteracts the pressure caused by carbonation. The polymer canister is capable of holding carbonated, non-carbonated, and alcoholic beverages and is compatible with standard metal easy-open lids such as but not limited to aluminium, tin, steel and the like. Its design allows for seamless integration into standard, existing, filling and seaming infrastructure, an attractive proposition for beverage producers. It can be manufactured easily using existing polymer manufacturing technology, making it a cost-effective alternative for manufacturers as well. The invention also offers improved branding possibilities, visibility of contents, and a lower carbon footprint due to its material properties and high recyclability, marking a significant advancement over aluminium cans and traditional plastic bottles.
[0014] The invention further allows the use of polypropylene for hot-filled beverages, capable of withstanding up to 121°C. The packaging system supports transparency, recyclability, and compatibility with existing filling and seaming lines, thereby offering commercial scalability and environmental benefits.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 Front View in accordance with the present invention;
Fig. 2 Perspective View in accordance with the present invention;
Fig. 3 Sectional View of Ridged Concave Bottom Showing Taper Geometry and Angle of Concavity in accordance with the present invention;
Fig. 4a Sectional View of Circumferential Ridge Geometry in accordance with the present invention;
Fig. 4b Detailed View of Circumferential Ridge Geometry in accordance with the present invention;
Fig. 5a Sectional View Showing Variable Width of Radial Ridge in accordance with the present invention;
Fig. 5b Detailed View of Radial Ridge Geometry in accordance with the present invention;
REFERENCE NUMERALS
101 - Easy Open-End Neck
101a - Flanged Rim for Aluminium and alternative metallic Lid Seaming
101b - Curved Tapering Transition of Neck
102 - Main Cylindrical Body
102a - Central zone (for Branding/Labelling)
103 - Ridged Concave Bottom
103a - Radial Ridges
103b - Circumferential Ridges
302- Overall Width of the Taper
303– Vertical Height of the Taper
401 - Height
402 - Cross-sectional Width
403 - Circumferential Width
404 - Arc Length
501 - Radial Length
502 - Ridge Protrusion Height
503 - The Width of the Radial Ridges
A301 - Half angle of the taper with central vertical axis
DETAILED DESCRIPTION OF THE INVENTION
[0015] The principles of operation, design configurations and evaluation values in these non-limiting examples can be varied and are merely cited to illustrate at least one embodiment of the invention, without limiting the scope thereof.
[0016] The embodiments disclosed herein can be expressed in different forms and should not be considered as limited to the listed embodiments in the disclosed invention. The various embodiments outlined in the subsequent sections are constructed such that they provide a complete and thorough understanding of the disclosed invention by clearly describing the scope of the invention for those skilled in the art.
[0017] Throughout this specification, various indications have been given as to preferred and alternative embodiments of the invention. It should be understood that it is the appended claims, including all equivalents, which are intended to define the spirit and scope of this invention.
[0018] The present invention discloses a fully polymeric canister that is moulded to include three key sections working in concert to contain carbonated beverages: an Easy Open-End Neck, a Body, and a Ridged Concave Bottom. The Easy Open-End Neck is precisely shaped to accommodate and seal conventional metal easy-open lids. The neck is flanged and contoured such that the metal lid can be double-seamed using industry-standard seaming equipment without requiring changes to existing machinery. This compatibility across dissimilar materials is a novel and essential feature of the invention.
[0019] Easy Open-End Neck: The Easy Open End neck is a specially designed curved neck. The neck consists of a flange which has been designed in a manner to suit conventional and readily available metal Easy Open Ends. The neck design is configured to ensure secure, leak-proof seaming of conventional easy-open lids, such as those made of aluminium, onto the polymer can. This is especially novel because the design of the the easy-open end neck is designed to facilitate leak-proof seaming between two dissimilar materials namely, an aluminium or other metallic easy-open lid and a polymer-based can body and overcomes known sealing challenges between dissimilar materials.
[0020] Body of the Can: The Body of the Can, can be made in any shape. It is essentially the middle section, which connects the Easy Open End Neck (a) to the Ridged Concave Bottom. The Body of the Can is designed to contain the liquid. The walls of Can are also designed to withstand the internal pressure of carbonation.
[0021] Ridged Concave Bottom: The Ridged Concave Bottom is a key structural and innovative part of the Can. The ridges, along with the specific angle of concavity, are engineered to uniformly distribute internal gas pressure generated by carbonated beverages.
[0022] The Body of the canister, connecting the Easy Open-End Neck to the base, serves as the primary containment section. It is designed in such a way as to withstand the high internal pressure typically associated with carbonated liquids. The wall thickness, polymer grade selection, and moulded geometry are optimised to provide durability without compromising recyclability or transparency. The body may be shaped cylindrically or contoured as per technical and/or design requirements, and its material properties allow for in-mould labelling, creating additional avenues for tamper-proof branding and counterfeit protection.
[0023] As shown in Fig. 1, the rear elevation view of the fully moulded polymer canister is detailed below.
[0024] It highlights the vertical symmetry and showcases the structural interplay between the canister’s three main sections:
[0025] The Easy Open-End Neck (101) is visible at the top portion of the canister, showing a flanged rim (101a) that allows secure seaming of the metal lid using conventional double-seaming equipment.
[0026] A critical functional advancement in the disclosed polymer-based canister is the achievement of a zero-leakage sealing interface between the polymer body and the metallic easy-open lid. This is made possible through the unique configuration of the Easy Open-End Neck, which includes a specially contoured flange (101a) tailored to engage with industry-standard double-seaming equipment. The geometric precision of the neck ensures uniform compression during the seaming process, allowing the metal lid typically aluminium or tin to bond hermetically with the polymer surface despite the inherent differences in material flexibility, hardness, and thermal expansion. The tapering transition zone (101b) absorbs and redistributes the mechanical stress induced during seaming and carbonation, preventing micro-gaps or seam deformation. In addition, the polymer formulation used in the neck region exhibits high dimensional stability and resilience under pressure, ensuring that no leak pathways develop even after prolonged exposure to internal carbonation pressure. This innovative sealing system allows for complete gas retention and prevents any ingress or egress of fluids or gases, ensuring extended shelf-life, optimal carbonation levels, and full product integrity during transportation and storage. This zero-leakage capability is particularly crucial for maintaining the safety and quality of high-pressure carbonated beverages and alcohol-infused formulations.
[0027] The Body (102) appears as the central cylindrical section connecting the neck to the base. The wall thickness is engineered to resist internal pressure without deformation. The Body (102) acts as the containment zone, connecting the neck to the base. The wall thickness (0.3 mm–0.7 mm depending on volume) and geometry are engineered for high pressure retention without deformation. The central zone (102a) allows for branding or in-mould labelling, with the transparency of the polymer enabling direct beverage visibility.
[0028] The Ridged Concave Bottom (103) is evident in its contoured design. The radial ridges (103a) and circumferential ridges (103b) sculpted into a concave profile and are clearly visible even from the back, contributing to uniform stress distribution. The Ridged Concave Bottom mimics the flat-bottomed appearance of conventional aluminium cans, while still withstanding the internal pressure of carbonation. Without resorting to petaloid geometries at the base, this design assures stackability and improves the handling experience.
[0029] The invention also encompasses the flexibility to manufacture the canister in a wide range of sizes and dimensional profiles, depending on the specific volume requirements, branding objectives, or ergonomic considerations of the target beverage product. The modularity of the moulding process permits the creation of canisters ranging from compact units for energy shots or premium concentrates, up to larger formats suited for family-size sparkling water or alcoholic beverages. The diameter and height of the Body (102), as well as the curvature and diameter of the Ridged Concave Bottom (103), can be adapted without compromising the internal pressure-resisting capability, owing to the scalable ridge geometry and customizable wall thicknesses. Similarly, the Easy Open-End Neck (101) may be designed with varying flange diameters and taper transitions to accept metal lids of multiple standard sizes, enabling manufacturers to streamline inventory and leverage existing lid stock. The dimensional adaptability also extends to aesthetic customizations, allowing beverage brands to differentiate themselves through unique silhouettes, embossing, or ergonomic contours while preserving mechanical stability. This scalable design potential ensures that the canister system is versatile across product lines, consumer segments, and regional markets, facilitating wide commercial applicability while upholding all functional and environmental advantages described in this invention.
[0030] Fig 2 depicts an angled perspective view of the polymer canister, providing a comprehensive three-dimensional representation of its form and structural highlights:
[0031] The Easy Open-End Neck (101) is prominently shown with its curved tapering transition (101b) that allows for ergonomic handling and smooth beverage flow upon opening.
[0032] The Body (102) is seen in its full cylindrical form. This view also showcases potential branding zones where in-mould labelling can be applied seamlessly, maintaining tamper-proof integrity.
[0033] The Ridged Concave Bottom (103) with visible concave geometry merging into multi-directional radial ridges (103a) with circumferential ridges (103b) along the border. These geometric features not only withstand internal pressure but mimic a flat base for better shelf presence.
[0034] The most critical innovation lies in the Ridged Concave Bottom of the canister. Unlike traditional petalloid bases, which increase material use and compromise aesthetics, the Ridged concave base in the present invention is engineered with carefully designed concavity angles and ridge structures. These geometrical features distribute the pressure evenly and provide additional structural support, enabling the canister to remain intact even under the high gas pressure of carbonated liquids. This reduces the risk of deformation or rupture, thereby extending the shelf-life of the beverage and enhancing consumer safety. Furthermore, the ridged base not only imparts strength but also improves stackability and consumer handling experience.
[0035] The invention allows for variations in the shape of the Easy Open-End Neck to accommodate different lid diameters and geometries. Similarly, the Body and Bottom can be modified in terms of shape, material composition, and aesthetic design to cater to specific beverage categories and branding requirements. Despite these variations, the design elements and pressure-handling capability remain intact. The canister is compatible with manual and automated filling lines. After filling, the metal lid is applied and seamed to create a leak-proof seal, making the packaging ready for distribution and retail.
[0036] The invention provides several advantages over existing aluminium and plastic packaging solutions for beverages. Firstly, the polymer canister offers transparency, allowing consumers to visually inspect the beverage, an impossible feature with aluminium cans. Secondly, polymer cans significantly reduce manufacturing and packaging costs, especially when compared to aluminium, whose price is subject to high market volatility. Thirdly, the use of recyclable polymers such as but not limited to PET and rPET ensures that the packaging has a much lower carbon footprint and is compatible with global recycling infrastructure.To assess the performance and environmental superiority of the disclosed polymer canister over conventional aluminium cans, comprehensive comparative tests and lifecycle evaluations were conducted. The test results confirm that the polymer canister structure exhibited external pressure resistance up to 5.8–6.0 bar, significantly outperforming conventional aluminium cans, which typically begin to deform or fail at external top load pressures exceeding 4.2 bar. This superior pressure resistance is attributed to the novel ridged concave base geometry and the uniform wall thickness of the polymer structure.
[0037] Furthermore, the Test results conclusively prove that the invention outperforms conventional aluminium cans in many aspects, while also matching performance in some others.
[0038] From a carbonation retention perspective, the polymer canister demonstrated stable CO2 containment over a 60-day simulation test at 25°C, with no measurable leakage or loss in carbonation strength, indicating excellent gas barrier properties when the lid was double-seamed onto the flanged polymer neck. In contrast, aluminium cans showed minor drop-offs in carbonation retention under accelerated thermal cycling, indicating microstructural fatigue near the seams.
[0039] Furthermore, in the current embodiment of the invention, the Radial Ridges are Ovoid. However, the Radial Ridges can also be elliptical, cylindrical, rectangular and/or any other shape, as necessitated by the carbonation pressure requirements.
[0040] The canister can be manufactured in volume variants such as 150 mL, 250 mL, 330 mL, 500 mL, and up to 1 Litre. The flange diameter and neck curvature can be adapted for compatibility with different EOE lid sizes, a range including but not limited to, 50mm to 160mm, based on current EOE Lids under manufacture. The modular moulding process supports scalable production with low tooling changes.
[0041] The ridged concave bottom of the canister is engineered with a half angle of concavity (A301) measured between the concave taper surface and the central vertical axis of the canister ranging from a minimum of 7.5° to a maximum of 89°, corresponding to a full cone angle range of 15° to 178°. This angular range is the result of systematic optimization to enhance axial load distribution, maintain base stability, and accommodate various manufacturing processes such as injection molding or blow molding. A minimum half angle of 7.5° ensures a distinctly concave geometry that introduces meaningful curvature for structural reinforcement, avoiding shallow depressions that provide negligible mechanical benefit. At the other extreme, a maximum half angle of 89° (approaching a nearly flat base) is set to allow sufficient curvature without inverting the concavity or transitioning into a convex or flat base, which would lose the intended mechanical advantages. Beyond this range, particularly below 7.5° or above 89°, the structure becomes either too shallow to provide reinforcement or too steep to ensure stackability, filling stability, and uniform wall thickness during molding. The defined angular range ensures optimal load deflection under external top-load conditions, prevents base collapse during vertical compression, and contributes to the observed pressure resistance exceeding 5.8 bar. This specific range also anticipates and excludes trivial geometric variations that might be introduced solely for design-around purposes, thereby safeguarding the inventive scope and reinforcing the canister’s structural and functional distinctiveness.
[0042] The ridged concave bottom of the disclosed polymer canister features a specifically optimized taper, wherein the overall width of the taper (302) ranges from a minimum of 20 mm to a maximum of 160 mm, and the vertical height of the taper ranges from a minimum of 5 mm to a maximum of 50 mm. These dimensional limits were defined based on extensive design trials, mechanical simulations, and load-bearing performance evaluations. A minimum width of 20 mm ensures that the structural reinforcement zone is sufficiently broad to distribute axial loads and prevent concentrated stress points that could lead to base failure.
[0043] Conversely, the maximum width of 160 mm represents the upper threshold beyond which the taper may interfere with functional base area, reduce stackability, or affect the canister’s center of gravity. Similarly, a vertical height of at least 5 mm is essential to introduce meaningful concavity for stress redirection and to provide rigidity against external top-load buckling, while a maximum height of 50 mm is imposed to prevent excessive intrusion into the internal volume of the canister, ensuring filling efficiency and manufacturing compatibility. These defined dimensional ranges are critical not only to structural integrity but also to preserving volumetric efficiency and mass-production adaptability. Any deviation beyond these limits has been found to compromise the balance between mechanical performance, user convenience, and design compatibility, thereby establishing the claimed range as both functionally and industrially optimal. The deliberate definition of both lower and upper bounds precludes minor geometric variations that might otherwise be used in attempt to circumvent the inventive concept, thereby reinforcing the novelty and non-obviousness of the claimed structure.
[0044] The vertical height of the taper (303) ranges from a minimum of 5 mm to a maximum of 50 mm to ensure adequate concavity for external load resistance while preserving internal volume and stability during moulding. The circumferential ridges (103b), which act as reinforcement rings, have been dimensioned with the following functional ranges: ridge height (401) from 1 mm to 10 mm, cross-sectional width (402) from 1 mm to 10 mm, circumferential width (403) from 1 mm to 65 mm, and arc length (404) from 2 mm to 10 mm. These dimensions are critical to reinforcing the radial symmetry of the base and resisting deformation under vertical compression or stacking loads. Likewise, the radial ridges (103a), which transfer axial force radially toward the canister's edge, have a radial length (501) between 2 mm and 50 mm and a ridge protrusion height (502) between 2 mm and 10 mm, allowing them to maintain rigidity without introducing sharp stress gradients or manufacturing complexities.
[0045] While the width of the radial ridges (503) is intentionally left non-limiting, it is adaptable based on the number of ridges, canister diameter, and internal carbonation pressure, thereby allowing design flexibility without compromising performance. The number of radial ridges (103a) may be as low as 3, with no upper limit here but is determined by functional factors such as canister volume and carbonation pressure. Similarly, the number of circumferential ridges (103b) can be as low as 4, with no upper limit here and with the same considerations. These minimum values represent the lowest known configurations that still maintain structural performance, while upper limits are intentionally not fixed to prevent design circumvention.
[0046] The canister also features an easy open-end neck designed for compatibility with standard aluminium lids using leak-proof double seaming, thereby ensuring safe sealing under pressure. The neck dimensions range from 50 mm to 160 mm in diameter, allowing compatibility with a variety of lid sizes used across the beverage industry. Additionally, the cylindrical body includes a defined tamper-proof in-mould central zone (102a), enabling brand authentication, regulatory compliance, and anti-counterfeit protection.
[0047] Finally, the canister can be manufactured using injection stretch blow moulding (ISBM), injection moulding, or any suitable moulding technology, ensuring compatibility with scalable, high-throughput industrial fabrication techniques across polymer types and canister volumes.
[0048] For hot-fill applications, the canister may be composed of polypropylene or a thermally stable recyclable polymer. These variants retain form up to 121°C, suitable for soups, teas, and retort beverages. The seamed structure remains intact during thermal cycling, ensuring safety and product integrity.
[0049] Testing has confirmed that the polymer canister can withstand internal pressure up to 6 bar without deformation or leakage. Comparative data shows enhanced pressure resistance and better recyclability than aluminium cans. The canister also eliminates metallic taste and corrosion issues commonly associated with metal packaging.
[0050] Sustainability metrics further underscore the advantages of the disclosed invention. According to independent datasets and comparative lifecycle assessments, PET and rPET containers require approximately 60% less energy to manufacture compared to aluminium cans, with significantly lower CO2 emissions per unit produced. While aluminium is technically recyclable, it demands up to 14.5 MJ/kg of energy input during recycling, compared to 2.1 MJ/kg for PET, rendering PET the more energy-efficient material in real-world infrastructure.
Table – Test Comparisons
Test Comparison PET Cans and Aluminium Cans

S.No. Test Name Test Equipment Test Method PET CAN Aluminium CAN
1 Wall Thickness Wall Thickness Gauge (Magna-Mike) 1. Place the target ball inside the CAN at the location to be measured. Average : 0.40mm Average : 0.10mm
2. Measure thickness at multiple points on CAN. (Top, Middle & Bottom)
3. Take three readings at each point and calculate the average result.

2 Top Load Test Digital Top Load Tester 1. Place the can upright on the bottom compression plate of the machine. 1.Empty Can:75Kg
(No Deformation)
2.Filled Can :100Kg
(No Deformation) 1.Empty Can:40Kg
(Deformed)
2.Filled Can:100Kg
(No Deformation)
2. Start the machine to apply force on the top of the can.
3. The can collapses or deforms significantly, or a specified maximum load is reached.


3 Drop Test Drop Tester 1. Use a finished can (sealed and filled to the normal fill level). Drop Height at 0.8m - Pass Drop Height at 0.8m - Fail (Dent)
2. Inspect the can to ensure there is no prior damage.
3. Perform drops in two orientations: vertical drop and horizontal drop. Drop Height at 1.2m -Pass Drop Height at 1.2m -Fail (Dent & Leakage)
4. Hold the can at the required height.
5. Drop it freely onto a flat, rigid surface. Drop Height at 1.5m - Fail
(Dent & Leakage) Drop Height at 1.5m -Fail (Dent & Leakage)
6. Ensure consistent orientation during each test.
7. After each drop, inspect the can for cracks, leaks, and dents.

4 Transparency Transparency Tester 1. Cut a flat section (50 mm × 50 mm) from the can. 90% 0%
2. Clean the sample surface thoroughly to remove any contaminants.
3. Place the prepared sample in the instrument's sample holder.
4. Measure and record the transmittance percentage.

5 Environmental Stress Crack Resistance
(ESCR) 1. Hot Air Oven
2. Magnifying glass 1. Use a finished can (sealed and filled to the normal fill level). No Deformation,
No Cracks &
No Leakage No Deformation,
No Cracks &
No Leakage
2. Place the sample in a controlled environment at a temperature of 50?°C for up to 2 days.
3. After the exposure period,Inspect for deformation, leaks, or seal failure. (using a magnifying lens if necessary)

6 Overall Migration Test 1. Analytical Balance
2. Hot Air Oven
3. Water Bath
4. Glass Beakers
5. Desiccators
6. SS Dish
7. SS Tongs
8. Distilled Water & Ethanol
9.Electric Hot Plate 1. Fill the can with Ethanol 50% and Distilled Water 50%. 2.83 mg/l Not measurable
2. Properly seal the can to avoid evaporation or contamination.
3. Place the sealed can in an oven at a specified temperature at 40°C for 10 days.
4. After, carefully collect the simulant from the can.
5. Measure the amount of migrated substances using an analytical method.
6. Compare migration levels against regulatory limits. Max : 60mg/l
7 Specific Migration As per FSSAI Regulation Required Notification on 24th December 2018.Specific Requirement Unit : mg/l Not measurable
1.Barium (Ba) Max 1.00 0.0018
2.Cobalt (Co) Max 0.05 0.0010
3.Copper (Cu) Max 5.00 0.0006
4.Iron (Fe) Max 48.00 0.0015
5.Lithium (Li) Max 0.60 Not Detected
6.Manganese (Mn) Max 0.60 0.0004
7.Zinc (Zn) Max 25.00 0.0003
8.Antimony (Sb) Max 0.04 0.0004
9.Phthalic Acid, Bis(2-ethylexyl) ester(DEHP) Max 1.50 Below Deduction Limit (BDL)

[0051] Moreover, aluminium beverage cans often undergo lacquering and internal coatings to prevent corrosion and taste alteration, adding to material complexity and recycling challenges. In contrast, the polymer canister disclosed in the present invention eliminates these needs entirely while offering transparency, corrosion resistance, and compatibility with mono-material recycling streams.
[0052] On a functional level, polymer canisters allow direct visual verification of product integrity, enhance branding via in-mould labelling, and prevent leaching or flavour distortion, which are known drawbacks of metallic containers, particularly for acidic, alcoholic, or flavoured formulations.
[0053] An additional commercial advantage lies in the flexibility for brand-specific customization through in-mould labelling, enabling vibrant, tamper-proof designs that eliminate the need for printing and storage of multiple pre-branded cans. Additionally, the ridged concave base design allows the canister to sustain internal pressures without failure, which is a critical requirement for carbonated and alcoholic beverages. Unlike aluminium cans that may corrode, leach, or impart a metallic taste, polymer canisters maintain the purity and original flavor profile of the beverage. Applications of the invention include packaging of carbonated drinks, ready-to-drink cocktails, energy beverages, and is also extendable to functional drinks and sparkling water. Its compatibility with existing seaming infrastructure, suitability for mass-production environments, and mono-material recyclability make it ideal for sustainability-focused beverage manufacturers. The invention thus meets both environmental and commercial requirements and provides a novel, scalable solution to an urgent global problem.
While the foregoing written description of the invention enables one of ordinary skill to make
and use what is considered presently to be the best mode thereof, those of ordinary skill will
understand and appreciate the existence of variations, combinations, and equivalents of the
specific embodiment, method, and examples herein. The invention should therefore not be
limited by the above described embodiment, method, and examples, but by all embodiments
and methods within the scope of the invention as claimed. ,CLAIMS:I/We Claim:
1. A fully recyclable polymer-based moulded canister for beverages comprising:
an easy open-end neck (101) with a flanged rim (101a) compatible with standard metal lids; a cylindrical body (102) with a wall thickness between 0.3 mm and 0.7 mm; and a ridged concave bottom (103) having radial (103a) and circumferential ridges (103b), wherein the canister withstands carbonation pressure up to 6 bar and is compatible with standard seaming equipment.
2. The canister as claimed in claim 1, wherein the polymer is selected from PET, rPET, polypropylene, or any recyclable polymer capable of withstanding carbonation and/or hot-fill conditions.
3. The canister as claimed in claim 1, wherein the ridged concave bottom comprises a half angle of concavity (A301) measured with respect to the central vertical axis of the canister, ranging from 7.5 degrees to 89 degrees, corresponding to a total cone angle range of 15 degrees to 178 degrees.
4. The canister as claimed in claim 1 wherein the ridged concave bottom comprises a taper (302) having an overall width ranging from a minimum diameter of 20mm to a maximum 160mm.
5. The canister as claimed in claim 1 wherein the ridged concave bottom comprises a taper (303) having a vertical height ranging from a minimum diameter of 5mm to maximum 50mm.
6. The canister as claimed in claim 1 wherein the circumferential ridges (103b) on the ridged concave bottom have the following dimensional ranges: a) height (401) from 1mm to 10mm b) cross-sectional width (402) from 1mm to 10mm c) circumferential width (403) from 1mm to 65mm d) arc length (404) from 2mm to 10mm.
7. The canister as claimed in claim 1 wherein the radial ridges (103a) on the ridged concave bottom have the following dimensional ranges: a) radial length (501) between 2mm and 50mm b) tidge protrusion height (502) between 2mm and 10mm.
8. The canister as claimed in claim 1, wherein the ridged concave bottom comprises radial ridges (503) having a width that is not limited and can vary based on the overall number of ridges, the size of the canister and the internal carbonation pressure requirements.
9. The canister as claimed in claim 1 wherein the number of radial ridges (103a) on the ridged concave bottom can be as low as 3, and is determined by a) the size of the canister, and b) the requirements in terms of internal pressure of carbonation.
10. The canister as claimed in claim 1 wherein the number of circumferential ridges (103b) on the ridged concave bottom can be as low as 4, and is determined by a) the size of the canister, and b) the requirements in terms of internal pressure of carbonation.
11. The canister as claimed in claim 1, wherein the easy open-end neck is adapted for leak-proof double seaming with aluminium lids.
12. The canister as claimed in claim 1, wherein the dimensions of the easy open end neck can range from a diameter of 50mm to 160mm.
13. The canister as claimed in claim 1, wherein the cylindrical Body includes a central zone (102a) for tamper-proof in-mould labelling.
14. The canister as claimed in claim 1, wherein the canister is adapted for hot-filled beverages with temperatures up to 121°C.
15. The canister as claimed in claim 1, wherein the canister is manufactured using injection stretch blow moulding (ISBM), injection moulding, or any suitable moulding technology.
16. The canister as claimed in claim 1, wherein the canister is transparent to allow beverage visibility.
17. The canister as claimed in claim 1, wherein the canister has modular volume options ranging from 100 mL to 1 L.
18. The canister as claimed in claim 1, wherein the canister exhibits pressure retention without the use of petalloid geometry.