Corrugated Paper Straw Structure for Repeated Bending Resistance
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Solution Overview
Problem
Paper drinking straws are prone to collapse, sogginess, and degradation, making them unsuitable for repeated bending and mass production, while existing solutions like plastic straws have environmental concerns.
Innovation Solution
A flexible paper drinking straw is created using a corrugating machine that forms annular corrugations in a paper tube, allowing for repeated bending and resilience, with a multi-ply helical construction and annular corrugations that enable shape memory and resistance to fluid exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional paper straws are used, then they are environmentally friendly and cost-effective, but they collapse, become soggy, and cannot withstand repeated bending
Solution Approach 1:
The straw is constructed with multiple plies (layers) of paper material wound helically around a core. This multi-ply segmented structure provides enhanced structural integrity and resistance to collapse and sogginess compared to single-layer paper straws, while maintaining the environmental benefits of paper material
Solution Approach 2:
Annular corrugations are pre-formed in the straw wall during manufacturing. These pre-formed corrugations create rigid circumferential structures that prevent the straw from collapsing inward when subjected to external pressure or bending forces, addressing the collapse issue before use
2Reliability
If plastic straws are used, then they resist bending and fluid exposure, but they are environmentally harmful and more expensive
Solution Approach 1:
The straw combines multiple paper plies with different orientations (helical winding around a core) to create a composite paper structure. This composite construction provides plastic-like resistance to fluid exposure and structural integrity while maintaining the environmental benefits of using only paper materials
3Reliability
If paper straws are engineered for novelty and specialty purposes, then they achieve special properties, but they cost four to five times more than plastic straws
Solution Approach 1:
The invention uses standard paper materials with conventional properties but changes the structural parameters - specifically the helical winding configuration and annular corrugation geometry. These parameter changes in the structure, rather than requiring expensive specialized materials, achieve enhanced performance at lower cost
4Adaptability or versatility
If annular corrugations are formed in the straw, then flexibility and shape memory are improved, but manufacturing complexity increases
Solution Approach 1:
The mandrel used in the corrugating machine has a curved or cylindrical surface that naturally forms annular corrugations when the paper tube is wrapped around it. This curvature-based approach simplifies the corrugation process compared to using complex forming tools, enabling flexibility and shape memory while controlling manufacturing complexity
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 straw maintains structural integrity and flexibility, resisting bending and fluid exposure, while being cost-effective and environmentally friendly, addressing the limitations of traditional paper straws.
Implementation Method 1
forming annular corrugations in a tube... Each of the corrugating elements is spaced apart from each other in both a lateral direction and a forward direction
Implementation Method 2
multi-ply helical construction... The paper used to form the straws can be difficult to work on a mass-production machine
Implementation Method 3
allowing for repeated bending and resilience... maintains structural integrity and flexibility, resisting bending
Data Source
AI summary
A machine for forming a flexible paper drinking straw by forming annular corrugations in a tube includes a plurality of corrugating elements and means for moving the tube against the corrugating elements. Each of the corrugating elements is spaced apart from each other in both a lateral direction and a forward direction. The corrugating machine includes an assembly spool and a drum mounted to a side of the assembly spool for rotation about a common axis. A mandrel is mounted to the drum for reciprocation into and out of the spool assembly, to carry the tube against the corrugating elements mounted in an arc defined about the common axis.