Tire Frame Using LLDPE Crystallization for Creep Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tires made from thermoplastic resin materials face challenges in achieving both creep characteristics and durability, particularly when using olefin resins, as they tend to struggle with maintaining shape and elasticity at high temperatures during high-speed travel.
Innovation Solution
A tire with a circular frame formed from a resin material containing linear low-density polyethylene (LLDPE) with a crystallization degree of 110 J/g to 138 J/g, combined with other resins like polyamide and acid-modified polyethylene, to enhance creep characteristics and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If olefin resin is used as tire frame material, then productivity and cost are improved, but creep characteristics and durability deteriorate
Solution Approach 1:
The patent uses a composite resin material system comprising polyethylene (40-80 wt%), polypropylene (10-50 wt%), and elastomer (5-30 wt%). This composite approach combines the high productivity and low cost of olefin resins with the excellent creep resistance of elastomers, achieving both improved productivity and maintained reliability. The specific composition range optimizes the balance between processing ease and mechanical performance.
Solution Approach 2:
The patent specifies precise parameter ranges for the resin materials, including the crystallization degree of polyethylene (100-140 J/g) and the composition ratios of different components. By controlling these parameters within specific ranges, the patent achieves optimal creep characteristics while maintaining the productivity advantages of thermoplastic materials. The elastomer content of 5-30 wt% is particularly critical for achieving the desired balance between durability and manufacturability.
2Ease of manufacture
If thermoplastic resin material is used for tire frame, then ease of molding and weight reduction are achieved, but heat resistance and shape maintenance at high temperature deteriorate
Solution Approach 1:
The patent combines thermoplastic polyethylene and polypropylene with heat-resistant elastomers to create a composite material that maintains the ease of molding advantages of thermoplastics while incorporating the high-temperature stability of elastomers. The elastomer component (5-30 wt%) provides thermal stability up to 90°C and above, preventing excessive deformation during high-speed travel while the thermoplastic matrix ensures injection moldability.
Solution Approach 2:
The patent controls the crystallization degree of polyethylene within 100-140 J/g and maintains specific composition ratios to optimize the melting point and thermal stability of the tire frame material. These parameter controls ensure that the material remains moldable during manufacturing but maintains sufficient rigidity and shape retention at operating temperatures of 90°C and above.
3Productivity
If polyethylene-containing resin material is used to improve productivity, then cost is reduced, but durability and elasticity deteriorate
Solution Approach 1:
The patent creates a composite system where polyethylene (40-80 wt%) provides low cost and high productivity through injection molding, while the added elastomer (5-30 wt%) and polypropylene (10-50 wt%) components restore durability and elasticity. The elastomer phase acts as a toughening agent that improves impact resistance and fatigue life, compensating for the inherent brittleness of pure polyethylene while maintaining the cost advantages of thermoplastic processing.
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 creep characteristics and durability while maintaining shape at high temperatures, ensuring efficient production and cost-effectiveness by using LLDPE with specific crystallization properties and additional resin modifications.
Implementation Method 1
a linear low-density polyethylene having a crystallization degree of from 110 J/g to 138 J/g
Data Source
AI summary
Provided is a tire which includes a circular tire frame formed from a resin material that contains a linear low-density polyethylene having a crystallization degree of from 110 J/g to 138 J.