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A single-ring piston ring and its sealing method is discussed. Either a circumferential scarf or step butt join is used. The assembly comprises a single-ring piston ring plus a pressure ring in a single groove. There is an oil collection groove below the piston ring groove with a drain port. The advantages claimed for the single-ring piston ring include enhanced sealing characteristics, fewer machining steps and low cost.
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A cosmetics case having a dual sealing structure is designed to retain the volatile solvents in the cosmetic and hence ensure a longer life for the cosmetics. Both the foldable mirror and the lid, containing the make-up tools are sealed.
## Dynamic sealing to 60% versus conventional wide unbalanced faces; the patent-pending graphite holder provides uniform pressure for better face squareness, tighter tolerances and greater sealing reliability. This eliminates the usual metal holder whose interference fit can cause uneven, distorti