Paper Straw with Corrugated Insert for Enhanced Flexural Rigidity
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Solution Overview
Problem
Existing paper straws lack sufficient flexural rigidity to effectively mix semi-liquid or thick products, while plastic straws are not environmentally friendly and may also lack the necessary rigidity.
Innovation Solution
A food-safe straw made from a paper material with an outer tubular element and a longitudinal insert that enhances bending strength, featuring a corrugated or jagged profile to increase rigidity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If paper material is used for straws, then environmental properties are improved (easy waste disposal), but flexural rigidity deteriorates (cannot mix semi-liquid or thick products)
Solution Approach 1:
The invention uses a composite structure consisting of an outer tubular paper element and an inner longitudinal insert (also made of paper material). This composite construction combines the environmental benefits of paper with enhanced structural rigidity, allowing the straw to maintain flexibility for compostability while gaining sufficient bending strength to mix semi-liquid products without breaking.
Solution Approach 2:
The straw is divided into two distinct functional segments: an outer tubular element that provides the basic straw structure and environmental compliance, and an inner longitudinal insert that specifically enhances flexural rigidity. This segmentation allows each component to fulfill its specific function while working together to resolve the contradiction between environmental friendliness and mechanical strength.
2Strength
If plastic material is used for straws, then flexural rigidity is improved, but environmental properties deteriorate (not environmentally friendly)
Solution Approach 1:
Instead of using plastic material, the invention creates a composite structure using two paper-based components. This approach achieves the desired rigidity enhancement while maintaining full environmental compatibility, as both the outer tubular element and inner insert are made from paper material that can be easily disposed of through composting or recycling.
3Ease of manufacture
If paper straws are made simple and flexible, then ease of manufacture is improved, but reliability deteriorates (tend to bend or break during mixing)
Solution Approach 1:
The manufacturing process is segmented into producing an outer tubular element and a separate inner longitudinal insert, which are then assembled together. This segmentation allows each component to be manufactured using simple paper-forming processes while the combination provides enhanced reliability and structural stability during use, preventing bending or breaking during mixing operations.
Data Source
Figure 1
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AI summary
A food-safe paper straw, comprising an outer tubular element (110) made of paper material which extends along a longitudinal axis and a longitudinal insert (120) made of paper material positioned inside the outer tubular element (110) and stably connected to an inner surface of the outer tubular element (110), said insert (120) having a profile, in transversal cross section, defined by a line at least partly corrugated and/or partly broken in such a way as to increase the bending strength of the straw (100), wherein said insert (120) is stably connected to the inner surface of the outer tubular element (110) in at least two connecting zones (121), preferably at least three connecting zones (121), angularly spaced from each other about said longitudinal axis.