Paper Threaded Lid Structure for Stackable Container Sealing
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Solution Overview
Problem
Existing container lids are not environmentally friendly and do not facilitate efficient stacking and secure sealing, particularly for recyclable and compostable materials.
Innovation Solution
A paper lid with a fitting flange that includes a thread protruding over the inner side and a groove, allowing for nesting and secure sealing, made from recyclable and compostable materials, with optional laminations for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional plastic lid is used, then sealing performance and durability are improved, but environmental friendliness and recyclability deteriorate
Solution Approach 1:
The patent changes the material parameter from conventional plastic to paper material, transforming the lid into a recyclable and compostable product while maintaining functional performance through specific structural design elements like the fitting flange and thread configuration
Solution Approach 2:
The patent employs composite construction by combining paper material with a fitting flange structure and thread elements, creating a multi-functional lid that achieves both environmental sustainability and reliable sealing through the integration of different structural components
2Productivity
If the fitting flange diameter is reduced for nesting, then stackability is improved, but structural strength deteriorates
Solution Approach 1:
The patent implements nesting capability by designing the fitting flange with a reduced diameter at its end, allowing one lid to be placed inside another for compact stacking and storage, optimizing space utilization without compromising the overall structural integrity through proper material distribution
Solution Approach 2:
The patent applies local quality by varying the diameter of the fitting flange along its length, with the end portion having a reduced diameter for nesting while the main body maintains sufficient diameter and thickness to provide the necessary structural strength and connection area
3Reliability
If the thread protrusion height is increased for secure engagement, then sealing reliability is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The patent applies partial action by providing a thread protrusion that extends only partially beyond the inner side of the fitting flange (0.5-2.0 mm), which is sufficient to engage with the container thread for reliable sealing while avoiding the need for excessive protrusion that would demand higher manufacturing precision
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a paper lid (3). The paper lid (3) comprises a central lid panel (7, 31) and a fitting flange (5). The fitting flange (5) is adapted to be arranged on a receptacle (2) of a container (1). The fitting flange (5) is made of paper material, wherein the fitting flange (5) forms a radially outer side (9) of the paper lid (3). A groove (11) is formed in the radially outer side (9) of the fitting flange (5) and the groove (11) forms a thread (13) on a radially inner side (15) of the fitting flange (5). The thread (13) is made of paper material. The invention further provides a container, stack of at least two containers and a method for producing a lid.