Two-Layer TPU Sheet for Inflatable Pad Welding Temperature Control
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Solution Overview
Problem
The manufacturing of inflatable pads using composite sheets with single-temperature TPU film faces challenges in achieving precise control over welding temperature and time due to equipment limitations, environmental variations, and manual operation, leading to issues like gas leakage and product defects.
Innovation Solution
A sheet comprising a substrate layer with a barrier layer made of a high-melting-point polymer material and a welding layer made of a low-melting-point polymer material, where the melting point of the barrier layer is at least 15°C higher than that of the welding layer, is used to form an inflatable pad. This design allows for a controlled welding process that reduces sensitivity to temperature deviations and improves air tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-temperature TPU film is used for welding, then the manufacturing process is simple, but the welding temperature control precision deteriorates due to heat loss fluctuations and environmental variations
Solution Approach 1:
The TPU film is segmented into two distinct layers: a barrier layer and a welding layer. Each layer serves a specific function - the barrier layer maintains airtightness with its higher melting point, while the welding layer facilitates controlled welding with its lower melting point. This segmentation allows independent optimization of each layer's properties without compromising the other.
Solution Approach 2:
Different regions of the TPU film are given different properties through the two-layer structure. The welding layer has a specifically designed lower melting point (15-30°C lower than the barrier layer) to enable precise welding at controlled temperatures. This local quality differentiation allows the welding process to be less sensitive to temperature fluctuations while maintaining overall film integrity.
2Strength
If higher welding temperature or longer welding time is used, then welding strength improves, but gas leakage increases due to over-melting and hole formation
Solution Approach 1:
The melting point parameter of the TPU film is changed by creating a two-layer structure with different melting points. The welding layer's lower melting point allows welding to occur at lower temperatures and shorter times, preventing over-melting of the barrier layer. This parameter change fundamentally alters the welding process characteristics to achieve both strength and reliability.
Solution Approach 2:
The TPU film is constructed as a composite material with two distinct polymer layers. The barrier layer provides airtightness with its higher melting point, while the welding layer provides weldability with its lower melting point. This composite structure enables the film to simultaneously achieve strong welding bonds and maintain gas tightness by preventing excessive heat penetration.
3Reliability
If lower welding temperature or shorter welding time is used, then gas leakage is reduced, but welding strength deteriorates due to insufficient melting
Solution Approach 1:
By changing the melting point parameter of the welding layer to be lower than the barrier layer, the welding process can occur at lower temperatures and shorter times. This parameter change ensures that sufficient melting occurs in the welding layer to create strong bonds, while the barrier layer remains unaffected and maintains airtightness.
4Weight of moving object
If TPU film thickness is reduced for portability, then weight and size decrease, but welding reliability deteriorates due to increased sensitivity to temperature deviations
Solution Approach 1:
The thin TPU film is segmented into two functional layers, each optimized for its specific purpose. The welding layer's lower melting point provides a larger temperature window for successful welding, making the process more reliable even in thin films. This segmentation allows thin-film inflatable products to achieve both portability and welding reliability.
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 proposed solution enhances the precision and reliability of the welding process, reducing the likelihood of gas leakage and improving the overall quality and yield of inflatable pads by maintaining air tightness and reducing production costs.
Implementation Method 1
a welding layer (404) formed of a second polymer material, wherein a melting point of the first polymer material is higher than a melting point of the second polymer material
Data Source
AI summary
A sheet, an inflatable product including the sheet, a sheet manufacturing apparatus, and a sheet manufacturing method are provided. The sheet includes layers of first and second polymer materials, the first polymer material having a higher melting point than the second polymer material, and a fabric layer laminated to the first polymer material by adhesive. The apparatus includes feeding devices outputting the first and second polymer materials in a flowable state; a sheet extrusion die converging the first and second polymer materials into a formed material sheet including a barrier layer and a welding layer formed from the first and second polymer materials; and a lamination device using an adhesive to laminate a fabric sheet to the barrier layer of the formed material sheet, and outputting a laminated material sheet including a fabric layer, an adhesive layer, and a substrate layer including the formed material sheet.