Paper Lid Guide and Curling Structure for Airtight Coupling
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Solution Overview
Problem
Existing paper lids for food containers suffer from instability in coupling with the container, leading to potential leakage and limited airtightness, and lack sufficient strength to maintain a secure fit.
Innovation Solution
A method of manufacturing a paper lid with a reinforcement frame and edge structure enhancements, including a skirt wall with a small diameter part, guide part, and curling tight-contact part, using eco-friendly synthetic resin coatings, and heat molding processes to enhance stability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flange part size is changed to improve compatibility with different cup container diameters, then adaptability is improved, but the lid body becomes easily separated from the cup container and airtightness is limited
Solution Approach 1:
The lid body is divided into multiple functional parts: a flange part for adaptability, a detachable groove for secure engagement, and an extended flange that wraps around the cup container. This segmentation allows each part to perform its specific function - the flange adapts to different diameters while the extended flange and detachable groove maintain secure coupling stability.
Solution Approach 2:
The flange part is extended in the vertical direction to create an extended flange that wraps around the cup container. This dimensional extension transforms a simple circular flange into a three-dimensional structure that provides both adaptability through size variation and reliability through the wrapping configuration that mechanically secures the lid to the container.
2Adaptability or versatility
If the detachable groove is formed along the inner corner portion to improve compatibility, then adaptability is improved, but the lid body may be easily detached from the cup container
Solution Approach 1:
The detachable groove is positioned at the inner corner portion where the flange part and main body part meet, separating the engagement function from the structural body. This segmentation allows the groove to provide secure mechanical engagement that prevents easy detachment while the flange part maintains adaptability to different container diameters.
3Ease of manufacture
If only the upper end of the curling part is accommodated in the detachable groove to maintain close contact, then ease of manufacture is improved, but airtightness is limited
Solution Approach 1:
The detachable groove is extended along the vertical direction beyond the original design, creating a deeper engagement structure. This dimensional extension allows the groove to accommodate more of the curling part, improving airtightness by preventing leakage paths while maintaining ease of manufacture through the simple groove geometry that can be formed in the molding process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced paper lid securely covers the food container, ensuring stable coupling and improved airtightness by tightly surrounding the reinforcement frame, with increased bending strength and ease of manufacturing.
Implementation Method 1
applying heat to the lid molding paper at temperature of 100° C. to 140° C.
Implementation Method 2
applying heat to the paper lid at temperature of 100° C. to 140° C., forming, while applying heat
Implementation Method 3
compressing, while applying heat to the lid molding paper at temperature of 100° C. to 140° C., the lid molding paper to mold the paper lid
Data Source
AI summary
Disclosed is a method of manufacturing a paper lid for a food container, the method including a blanking step of cutting out lid molding paper having radial wrinkles at the edge thereof from base paper having upper and lower surfaces, each of which is treated with a synthetic resin coating, a primary molding step of molding the paper lid including a cover plate and a skirt wall bent downwards along the edge of the cover plate, and a secondary molding step of forming a guide part obtained by bending a large diameter part of the skirt wall so as to be inclined outwards, the guide part guiding coupling with the upper portion of the food container, and molding a curling tight-contact part configured to tightly surround the outside of a reinforcement frame of the food container by curling the upper end of the guide part in the inward direction.