Can End Seam Seal Coating for Wine Corrosion Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Beverage containers, particularly those storing fermented beverages like wine, experience undesirable taste due to hydrogen sulfide aroma caused by aluminum corrosion, which is exacerbated by sulfur dioxide, and existing coatings are not durable enough to withstand manufacturing processes, leading to coating fractures and metal exposure.
Innovation Solution
A sealing compound is applied in a full coverage compound seam seal (FCCSS) position to cover metal exposure sites on can ends and bodies, forming a protective layer over fractures and voids in the cured coatings, ensuring the beverage does not contact bare metal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cured coating is applied to the can end to prevent corrosion, then the protective function is improved, but the coating fractures during seaming operations exposing bare metal
Solution Approach 1:
A sealing compound is applied to the can end prior to the double seaming operation. This preliminary application ensures that when the can end is seamed to the can body, the sealing compound is already in position to fill gaps and cover any coating fractures that occur during seaming, preventing bare metal exposure before corrosion can begin
Solution Approach 2:
The solution combines two different protective materials: a cured coating applied to the can end and a sealing compound applied in the seaming region. This composite approach provides dual protection - the cured coating offers baseline corrosion resistance while the sealing compound provides additional protection at the vulnerable seam area where coating fractures are most likely to occur
2Ease of manufacture
If aluminum containers are used for beverage storage, then manufacturing and cost benefits are achieved, but hydrogen sulfide corrosion occurs causing undesirable taste
Solution Approach 1:
A sealing compound acts as an intermediary barrier between the aluminum can end and the fermented beverage. This intermediary layer prevents direct contact between the aluminum surface and the beverage, blocking the chemical reaction that produces hydrogen sulfide while allowing the aluminum container to retain its manufacturing and cost advantages
3Reliability
If double seaming is used to attach can ends to can bodies, then hermetic sealing is achieved, but coating damage occurs exposing bare metal surfaces
Solution Approach 1:
The sealing compound is applied to the can end before the double seaming operation begins. This timing allows the sealing compound to be compressed and distributed into the seam structure during seaming, ensuring complete coverage of the seam region and any coating fractures without interfering with the hermetic seal formation
Data Source
AI summary
A can end (10) for a two-piece beverage container (1) has a public side (32) opposite a product side (34). A cured coating (76) is on the product side (34) of the can end (10) and forms a substantially continuous thin layer thereon. A circumferential curl (12) is centered about a longitudinal axis (50). A circumferential chuckwall (14) extends downwardly from the curl (12). A circumferential U-shaped countersink (16) is located downwardly from the chuckwall (14). The countersink (16) has an annular bead defining a lowermost vertical extent of the can end (10). A center panel (18) is located radially inwardly from the countersink (16) and is centered about the longitudinal axis (50). The center panel (18) has a means for providing an opening in the can end (10). A circumferential second coating (92) forms an annular layer on the product side (34) of the circumferential curl (12) and the cured coating (76). The second coating (92) provides a layer on one or more fractures in the cured coating (76).