Circular Blade Cutting for Tire Sheet Laminate Splice Integrity
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Solution Overview
Problem
The existing tire manufacturing methods using thermoplastic resin or thermoplastic resin compositions with elastomers often result in cracks and separation at the splice portions of sheet laminates, leading to reduced tire durability due to unstable and non-uniform cutting of end sections.
Innovation Solution
A tire manufacturing method involving the use of a circular blade that rotates dependently to cut the sheet laminate, forming sharpened end sections with a stable and uniform shape, thereby preventing cracks and separation at the splice portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a blade is used to cut the sheet laminate to a prescribed size, then the sheet can be cut to the required length, but the end sections become non-uniform and unstable in shape, leading to cracks and separation at splice portions
Solution Approach 1:
The patent replaces the conventional blade cutting mechanism with a circular blade that rotates dependently during the cutting process. This substitution transforms the cutting action from a simple linear blade movement to a rotating circular motion that naturally produces uniform sharpened end sections across the entire width of the sheet laminate, eliminating the non-uniformity problem while maintaining cutting efficiency
2Ease of manufacture
If the end sections of the sheet laminate are spliced to form an annular shape, then the tire can be manufactured, but cracks are generated in the vicinity of the splice portion after the tire begins moving, reducing durability
Solution Approach 1:
The patent applies preliminary action by forming sharpened end sections through dependent circular blade cutting before the splicing process. This preliminary shaping of the end sections creates a stable and uniform geometry that prevents crack initiation during subsequent splicing and tire operation, thereby improving durability while maintaining ease of manufacture
Solution Approach 2:
The patent changes the physical state and geometry parameters of the end sections by using a rotating circular blade to create sharpened surfaces with specific angular characteristics. This parameter change in the end section shape (from flat to sharpened) fundamentally alters the stress distribution at the splice portion, preventing crack generation and improving tire durability
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 method effectively prevents cracks and separation at the splice portions of the tire, enhancing the durability of the pneumatic tire by maintaining a stable and uniform end section form over the entire width of the cut section.
Implementation Method 1
pressing a circular blade, which dependently rotates from the side of the sheet comprising a thermoplastic resin or a thermoplastic resin composition in the sheet laminate, against the sheet laminate placed on the cutting edge cradle so as to cut the sheet laminate
Data Source
AI summary
The present technology provides a tire manufacturing method comprising: positioning a cutting edge cradle on an elastomer layer side of the sheet laminate; pressing a circular blade, which dependently rotates from the sheet side of the sheet laminate comprising a thermoplastic resin or a thermoplastic resin composition, against the sheet laminate placed on the cutting edge cradle so as to cut the sheet laminate; and forming end sections of the sheet laminates to be superimposed.