straw
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Solution Overview
Problem
Traditional paper straws are weak, prone to collapse when piercing the sealing film of paper cups, and contain environmentally harmful laminated coatings that hinder recycling and decomposition.
Innovation Solution
A tubular straw design with an overlapping portion sealed by a degradable coating, enhancing strength and durability, and using a fluorene-free paper substrate with a water-based coating that is recyclable and environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If paper straws use thicker paper sheets to improve strength, then the piercing capability and structural strength are improved, but the manufacturing complexity increases and the scrolling process becomes more difficult
Solution Approach 1:
The patent applies composite materials by combining paper substrate with a thermoplastic coating layer. This composite structure provides the necessary strength and rigidity for piercing sealing films while maintaining ease of manufacturing. The thermoplastic coating reinforces the paper structure without requiring excessive paper thickness, thus resolving the contradiction between strength and manufacturing complexity.
Solution Approach 2:
The patent changes the physical parameters of the paper structure by creating an overlapping portion with enhanced thickness and reinforcement. This localized parameter change at the overlapping section provides the needed piercing strength without increasing the thickness of the entire straw, thereby simplifying the scrolling and manufacturing processes while maintaining structural integrity.
2Reliability
If paper straws use laminated membrane or coating film layer to improve water-proof effect, then the liquid durability is improved, but the recyclability and environmental compatibility deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material from traditional non-degradable laminated membranes (PE, wax, fluorochemicals) to a thermoplastic polymer that is biodegradable and recyclable. This parameter change maintains the water-proof and liquid durability properties while eliminating the environmental harm associated with conventional coatings, allowing the straw to be recycled with the paper container.
Solution Approach 2:
The patent enables discarding and recovering by designing a coating system that can be easily separated and recycled along with the paper substrate. The thermoplastic coating can be recovered during the paper recycling process, eliminating the need for complex separation procedures and making the entire straw assembly recyclable, thus resolving the contradiction between liquid durability and recyclability.
3Reliability
If paper straws use PFAS or fluorene coatings to improve chemical stability and water-proof properties, then the liquid resistance is improved, but the environmental compatibility and human health safety deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by replacing PFAS and fluorene substances with food-grade thermoplastic polymers. This substitution maintains the essential liquid resistance and water-proof properties while eliminating the toxic effects and environmental persistence associated with PFAS, thereby resolving the contradiction between liquid resistance and human health safety.
4Strength
If paper straws are formed by cutting and adhering paper sheets into predetermined shapes, then the structural integrity is improved, but the manufacturing time and production efficiency deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-forming the paper substrate into a tubular shape with an overlapping portion before applying the thermoplastic coating. This preliminary structuring maintains structural integrity while simplifying subsequent manufacturing steps and enabling faster production compared to cutting and adhering separate paper pieces, thus resolving the contradiction between structural integrity and manufacturing efficiency.
Data Source
AI summary
A straw is disclosed. The straw comprises a tubular straw body having an end, and formed of a substrate, wherein the substrate has a first long side, a second long side, and a first thickness. The first long side overlaps with the second long side to form an overlapping portion having a second thickness. The straw is characterized in that a ratio of the second thickness to the first thickness is smaller than 2.