Polyamide Thermoplastic Elastomer Tire for Pressure Resistance
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Solution Overview
Problem
Tires made from thermoplastic polymer materials lack pressure resistance compared to conventional rubber tires, as they often do not incorporate reinforcing members like carcass plies, necessitating improved material properties to ensure structural integrity under internal pressure.
Innovation Solution
A tire composed of a polyamide-based thermoplastic elastomer with a crystallinity of 14% to 26% in its hard segment, combined with a soft ABA-type triblock polyether diamine, providing enhanced pressure resistance and productivity through injection-molding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tire is made from thermoplastic polymer material without reinforcing members, then productivity and ease of manufacture are improved through injection-molding capability, but pressure resistance deteriorates compared to conventional rubber tires
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystallinity of the hard segment in the polyamide-based thermoplastic elastomer to be within 14-26%. This specific crystallinity range optimizes the material's mechanical properties to achieve sufficient pressure resistance while maintaining injection-moldability. The parameter change directly resolves the contradiction by tuning the material structure rather than adding complex reinforcing members.
Solution Approach 2:
The patent uses composite materials by combining soft segments (ABA-type triblock polyether diamine) and hard segments (polyamide) to create a thermoplastic elastomer with balanced properties. This composite structure provides both the flexibility needed for injection-molding and the strength required for pressure resistance, eliminating the need for separate reinforcing members while maintaining structural integrity.
2Ease of manufacture
If a tire is made from thermoplastic polymer material, then ease of manufacture is improved through injection-molding capability, but manufacturing precision deteriorates due to lack of reinforcing members
Solution Approach 1:
The patent maintains manufacturing precision by controlling the crystallinity parameter within 14-26%, which ensures consistent material behavior during injection-molding. This precise parameter control allows the material to be molded accurately without requiring additional reinforcing members, thus maintaining both ease of manufacture and manufacturing precision.
3Strength
If the hard segment crystallinity is increased, then pressure resistance is improved, but ease of manufacture deteriorates due to reduced injection-molding capability
Solution Approach 1:
The patent identifies the optimal crystallinity range of 14-26% as the critical parameter that balances pressure resistance and injection-molding capability. Within this range, the material achieves sufficient crystalline structure for strength while maintaining enough amorphous content for melt flow during injection-molding. Exceeding this range would compromise either strength or manufacturability.
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 tire achieves excellent pressure resistance and improved productivity with a resin material that can be injection-molded, offering better durability and abrasion resistance while maintaining a simpler manufacturing process.
Implementation Method 1
the hard segment having a crystallinity of from 14% to 26%
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A tire which has a circular tire frame formed of a resin material, and the resin material includes a polyamide-based thermoplastic elastomer including a soft segment and a hard segment having a crystallinity of from 14% to 26% in a molecule thereof.