Drinking Straw Internal Coating for Controlled Active Agent Release
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Solution Overview
Problem
Existing drinking straws with dissolvable coatings often result in weak flavor impartation and quick dissolution, are economically uneconomical to produce, and require additional manufacturing steps or pose choking risks due to barrier means or filters, while failing to accommodate thick or viscous beverages.
Innovation Solution
A drinking straw with an internal coating comprising a modified cellulose-based matrix that adheres to the inside of the straw, releasing active agents like sweeteners, flavorings, and pharmaceuticals as the beverage is consumed, eliminating the need for barriers and allowing use with thick or viscous liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a dissolvable coating is applied to the inside of the straw, then flavor is imparted to the beverage, but the flavor is weak and the coating dissolves quickly
Solution Approach 1:
The patent applies a multi-layer composite coating structure where a polymer-based adhesive layer provides structural integrity and controlled dissolution rate, while a flavor-containing layer delivers the desired taste. This composite approach allows the coating to remain durable during storage and initial use, then progressively release flavor over time without dissolving too quickly.
Solution Approach 2:
The patent modifies the coating formulation by using polymer-based adhesives with specific dissolution characteristics that change based on contact time with the beverage. The coating is designed to undergo parameter changes in its dissolution rate, starting slower and accelerating gradually, which prevents premature flavor release while ensuring complete delivery by the end of consumption.
2Object-affected harmful factors
If barrier means or filters are added to retain filling material, then undissolved material is prevented from passing into the user's mouth, but additional manufacturing steps are added and choking risks remain
Solution Approach 1:
The patent removes the barrier/filter component entirely from the straw design. Instead of using a separate filtering mechanism, the flavor delivery is achieved through the dissolvable coating itself, which naturally releases only dissolved flavor compounds into the beverage without requiring any physical barrier to prevent choking.
Solution Approach 2:
The coating system is self-regulating in its flavor release mechanism. As the coating dissolves progressively during beverage consumption, it automatically controls the release of flavor material without needing external filtering components. The dissolution process itself serves as the natural filter, allowing only dissolved substances to pass into the beverage.
3Adaptability or versatility
If pellets are used to fill the straw, then flavor is delivered, but the straw cannot accommodate thick or viscous beverages
Solution Approach 1:
The patent uses a flexible dissolvable coating film applied to the inner surface of the straw, replacing rigid pellet fillings. This thin film structure can accommodate beverages of any viscosity including thick or viscous liquids, as it dissolves progressively regardless of flow characteristics, ensuring consistent flavor delivery across different beverage types.
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 modified cellulose-based coating provides consistent and controlled release of active agents into beverages, enhancing flavor and nutritional delivery without the risks associated with barriers, and accommodates a variety of liquid viscosities, improving user convenience and safety.
Implementation Method 1
the coating dissolves into the fluid
Implementation Method 2
an internal coating which progressively dissolves, breaks down or erodes in a fluid being drawn through the straw
Data Source
AI summary
A drinking straw having an internal coating for delivery of an active agent when the straw is used to consume a beverage is provided. The active agent includes sweetener, flavour, a nutrient and/or a pharmaceutical and optionally colour. The coating is prepared by mixing a modified cellulose with water to form a paste or gel. The coating is then used to coat the inside surface of a drinking straw to a thickness of up to 1 mm. The coating is dried to reduce the water content to less than 5% by weight. Liquid drawn through the straw breaks down the modified cellulose releasing the active agent into the liquid, for consumption.