Paper Lid Reverse-Taper Structure for Leak-Resistant Fit
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Solution Overview
Problem
Existing paper cups with paper lids suffer from leakage issues when inclined due to mismatched tapers between the cup and lid, and usability has not been adequately addressed in previous designs.
Innovation Solution
A paper lid design featuring a reverse-tapered portion that fits securely into a container, combined with a sealable drinking spout, air holes, and a holder for improved fit and sealability, utilizing a paper material with optional coatings for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic lid is used to cover the paper cup, then the sealability is improved, but the environmental friendliness deteriorates
Solution Approach 1:
The patent changes the material parameter from plastic to paper, and optimizes the geometric parameters (taper angle, wall thickness, flange dimensions) of the paper lid to achieve sealability comparable to plastic lids while maintaining environmental friendliness
Solution Approach 2:
The patent uses composite structure combining paper material with waterproof coating or lamination to achieve both environmental friendliness and sealability, creating a paper-based composite lid that prevents liquid penetration
2Ease of manufacture
If the paper cup and lid are both tapered forward, then the manufacturing is simplified, but the sealability deteriorates when the container is inclined
Solution Approach 1:
The patent inverts the taper direction of the lid wall relative to the cup, making the lid wall taper backward while the cup tapers forward. This creates an interference fit that prevents leakage when the container is inclined, while still allowing for simple manufacturing processes
3Object-affected harmful factors
If a paper lid is used instead of plastic lid, then the environmental friendliness is improved, but the sealability deteriorates
Solution Approach 1:
The patent optimizes geometric parameters including wall thickness, taper angle, and flange dimensions of the paper lid to achieve adequate sealability. The wall thickness is specifically controlled to prevent liquid penetration while maintaining the paper material's environmental benefits
Solution Approach 2:
The patent employs waterproof coatings or laminations on the paper lid surface to create a composite structure that prevents liquid penetration. This allows the lid to maintain environmental friendliness while achieving sealability comparable to plastic lids
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~2D
AI summary
In order to provide a paper lid with good usability, a paper lid includes a lid body portion that includes a paper material to be mounted on a container including an opening portion, a taper, and a curl portion, a first engaging portion that is provided in the lid body portion, includes a taper in the same direction as a direction of the taper, and engages with the curl portion from outside the curl portion, and a body portion side curl portion that is provided in the lid body portion and is positioned above the first engaging portion.