Buoyancy Dry Bag Composite Material Waterproofing
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Solution Overview
Problem
Conventional buoyancy dry bags made with PVC are difficult to color or print patterns on and are toxic, posing eco-friendly and health concerns.
Innovation Solution
The buoyancy dry bag features a thermoplastic polyurethane lining layer and a polyester external layer with a pattern layer, allowing for easy printing and being non-toxic, along with an air valve system for buoyancy, and a hook unit for hanging, using a design that includes sealing portions to form air chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PVC is used as the material for the buoyancy dry bag, then waterproof function is provided, but it is difficult to color or print patterns and it is toxic and not eco-friendly
Solution Approach 1:
The patent uses a composite material structure consisting of a thermoplastic polyurethane layer and a polyester layer with pattern. The thermoplastic polyurethane provides waterproof functionality while the polyester layer with printed patterns offers ease of customization and is non-toxic, thus resolving the contradiction between waterproof performance and ease of printing while eliminating toxicity.
Solution Approach 2:
The patent extracts the pattern printing function from the waterproof material itself by using a separate polyester layer with printed patterns. This allows the waterproof thermoplastic polyurethane layer to maintain its functional integrity while the polyester layer provides the aesthetic customization, solving both the printing difficulty and toxicity issues of PVC.
2Reliability
If PVC is used for the buoyancy dry bag, then waterproof function is achieved, but contact with human body for extended period should be avoided
Solution Approach 1:
The patent employs a composite material system where the thermoplastic polyurethane layer provides reliable waterproof function while the polyester layer that contacts the user's body is non-toxic and safe for extended contact. This composite approach maintains waterproof reliability while eliminating health safety concerns associated with PVC.
3Adaptability or versatility
If conventional PVC material is used, then waterproof function is provided, but customization of designs is difficult
Solution Approach 1:
The patent uses a composite structure where the polyester layer with printed patterns is combined with the thermoplastic polyurethane waterproof layer. This allows easy design customization on the polyester layer through conventional printing techniques while maintaining the waterproof functionality of the thermoplastic polyurethane, thus achieving both design versatility and manufacturing ease.
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 solution enables easy customization of designs, eco-friendliness, and effective buoyancy while avoiding the toxicity issues of PVC, with a simple manufacturing process and aesthetically appealing patterns.
Implementation Method 1
an air valve unit, wherein the air valve unit includes a first air valve mounted to the external layer structure of the first body part and being openable to permit injection of air into the first air chamber therethrough
Implementation Method 2
The first body part has a lining layer that is made of thermoplastic polyurethane
Data Source
AI summary
A buoyancy dry bag includes an air valve unit, and first and second body parts that are connected to each other and that cooperatively define a receiving space. The first body part has a lining layer made of thermoplastic polyurethane, and an external layer structure having an inner layer disposed at an outer side of the lining layer and made of thermoplastic polyurethane, an outer layer contacting an outer surface of the inner layer and made of polyester, and a pattern layer contacting the outer layer. The first body part defines a first air chamber between the lining layer and the inner layer. The air valve unit includes a first air valve mounted to the external layer structure for injection of air into the first air chamber therethrough.