Pneumatic Tire Innerliner Splice Structure to Prevent Delamination
Solution Overview
Problem
Existing methods for manufacturing pneumatic tires using a film with a thermoplastic resin or thermoplastic elastomer composition as an innerliner layer face issues with delamination and increased complexity at the splice portion, leading to tire failures.
Innovation Solution
A method involving a trilayer structure with a film and pair of rubber sheets, where the inner and outer rubber sheets are positioned to overlap and cover the film ends, ensuring secure bonding and preventing delamination, with specific end surface configurations and angles to enhance coverage and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If both ends of the laminated body are bonded to form a splice portion, then the tire component can be closed into a ring shape, but delamination between the film and rubber sheets occurs at the splice portion
Solution Approach 1:
The invention applies a mold release agent to the tire forming drum surface before winding the laminated body, and designs the end structure of the laminated body with the film end positioned between the inner and outer rubber sheet ends. This preliminary preparation prevents delamination from occurring at the splice portion during the bonding process.
Solution Approach 2:
The invention creates a localized end structure where the film end is positioned between the inner and outer rubber sheet ends at the splice portion. This local structural arrangement ensures that the film end is protected and prevents delamination specifically at the bonding area without affecting the overall structure.
2Ease of manufacture
If the laminated body is wound on the tire forming drum and both ends are bonded, then the tire component can be formed, but the mold release agent is liable to be entangled at the splice portion
Solution Approach 1:
The mold release agent is applied to the tire forming drum surface before winding the laminated body. This preliminary application ensures smooth winding and bonding while preventing entanglement at the splice portion, as the release agent creates a controlled interface between the laminated body and drum surface.
3Stability of the object's composition
If reinforcement measures are taken at the splice portion, then delamination can be suppressed, but the number of manufacturing steps increases
Solution Approach 1:
The invention combines the delamination prevention function with the existing splice portion structure by positioning the film end between the inner and outer rubber sheet ends. This integration eliminates the need for separate reinforcement measures while maintaining delamination resistance, thus preserving manufacturing efficiency.
Solution Approach 2:
The end structure of the laminated body is designed in advance with the film end positioned between the rubber sheet ends, and the mold release agent is applied beforehand. This preliminary design prevents delamination without requiring additional reinforcement steps during manufacturing.
4Device complexity
If the film end is exposed at the splice portion, then the structure is simple, but tire failure occurs due to delamination
Solution Approach 1:
The invention creates a localized arrangement where the film end is positioned between the inner and outer rubber sheet ends at the splice portion. This local structural configuration protects the film end from exposure and prevents delamination without significantly complicating the overall splice structure.
Solution Approach 2:
The laminated body end structure is designed in advance with the film end positioned between the rubber sheet ends, ensuring the film end is covered before bonding occurs. This preliminary positioning prevents tire failure due to delamination while maintaining structural simplicity.
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
This method effectively suppresses tire failures at the splice portion by ensuring the film ends are securely covered, reducing delamination and maintaining tire uniformity and weight efficiency.
Implementation Method 1
a film containing, as a main component, a thermoplastic resin or a thermoplastic elastomer composition containing a mixture of a thermoplastic resin and an elastomer
Implementation Method 2
bonding a winding starting end and a winding finishing end of the laminated body with each other
Data Source
AI summary
In a method for manufacturing a pneumatic tire, a laminated body is formed of a film containing a thermoplastic resin or elastomer, and rubber sheets laminated on surfaces of the film. A winding starting end of the inner rubber sheet is on a side opposite to a winding direction of the laminated body with respect to an end of the film; an end of the outer rubber sheet at the winding starting end is at the same position as the end of the film or is positioned on a side of the winding direction of the laminated body with respect to the end of the film. An outer surface of the outer rubber sheet at the winding starting end and an inner surface of the inner rubber sheet of a winding finishing end are brought into contact by overlapping and bonding the winding starting end and the winding finishing end.