Double-Layered Screen Cap Hermetic Sealing
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Solution Overview
Problem
Conventional cosmetics containers with screen caps fail to hermetically seal insert holes, leading to leakage and spillage of cosmetic materials due to the adhesive sticker losing viscosity or gaps between the rotary cover and screen cap.
Innovation Solution
A double-layered screen cap design featuring a lower cap with annular walls and insert holes, and an upper cap with projections that correspond to the insert holes, pivotally connected via a connecting unit, ensuring hermetic sealing and restricted positioning of cosmetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent sticker is used to seal the insert holes, then the cosmetic material can be restricted in the bottle, but the sticker loses viscosity and fails to seal hermetically after use
Solution Approach 1:
The single cap is divided into two separate caps: a lower cap with insert holes for material passage and an upper cap with projections for sealing. This segmentation allows each cap to have specialized functions, with the upper cap's projections providing reliable sealing in the insert holes without relying on adhesive stickers that lose effectiveness over time.
Solution Approach 2:
The projections on the upper cap serve as an intermediary sealing mechanism between the cap structure and the insert holes. Instead of using a sticker that directly contacts and adheres to the holes (which fails), the projections mechanically interface with the holes to provide hermetic sealing through physical engagement rather than adhesive bonding.
2Reliability
If a rotary cover is used to restrict cosmetic material, then the material can be positioned, but gaps between the cover and screen cap allow material to leak
Solution Approach 1:
The sealing function is separated from the positioning function. The upper cap with projections provides the sealing function by directly engaging with and sealing the insert holes, while the rotary mechanism provides positioning. This segmentation ensures that sealing is not compromised by gaps in the rotary cover design.
Solution Approach 2:
The sealing projections are locally positioned at specific locations corresponding to the insert holes on the upper cap. This local quality ensures that sealing occurs precisely where needed (at the insert holes) rather than relying on a general gap-free fit between the rotary cover and screen cap, thereby preventing leakage at the critical sealing points.
3Reliability
If the upper cap is fixed to the lower cap, then sealing is maintained, but the cap cannot be opened for use
Solution Approach 1:
The connection unit provides a dynamic linkage between the upper cap and lower cap, allowing the caps to rotate relative to each other from a closed sealing position to an open dispensing position. This dynamic capability enables the cap to transition between maintaining hermetic sealing (when closed) and allowing cosmetic material passage (when opened), resolving the contradiction between sealing reliability and ease of operation.
Data Source
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AI summary
A double-layered screen cap (100) of a cosmetics container (200) includes a lower cap (10) and an upper cap (20) pivotally connected together by a connecting unit (30). The lower cap (10) is bored with a plurality of insert holes (14), and the upper cap (20) is provided with a plurality of projections (21) corresponding to the insert holes (14). Thus, when the upper cap (20) is covered on the lower cap (10), the projections (21) of the upper cap (20) will be respectively and correspondingly inserted in the insert holes (14) of the lower cap (10) to hermetically seal the insert holes (14) for restrictedly positioning the cosmetic material (300) in the cosmetics container (200), able to prevent the cosmetic material (300) from leaking out of the cosmetics container (200).