Segmented Surface Fastener for Tire Inner Mounting
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Solution Overview
Problem
Existing methods for mounting surface fasteners on pneumatic tire inner surfaces during the molding process face inefficiencies and issues with fasteners falling off due to dimensional changes during the inflation and vulcanization of the tire.
Innovation Solution
A band-shaped surface fastener with a cut portion composed of notches extending in the width direction is used, allowing it to be divided into components that can stretch and remain continuous in the tire circumferential direction, preventing the fastener from falling off by ensuring it is securely attached through an adhesive rubber layer and strategic notch placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface fasteners are mounted on the tire inner surface after vulcanization, then the fasteners can be securely attached, but the production efficiency is extremely unfavorable
Solution Approach 1:
The surface fastener is mounted on the cylindrical carcass molded body before the tire molding process begins. The fastener is positioned on the inner surface of the carcass molded body in advance, allowing it to be automatically incorporated into the tire during the molding and vulcanization process, eliminating the need for separate post-vulcanization attachment operations
Solution Approach 2:
The surface fastener is designed to be self-fixing through the tire molding process itself. The vulcanization process naturally bonds the fastener to the tire inner surface without requiring additional attachment steps, as the fastener is already in position on the carcass molded body before molding begins
2Productivity
If surface fasteners are mounted during the tire molding process by wrapping around a molding drum, then production efficiency is improved, but the fasteners fall off during inflation and vulcanization due to dimensional changes
Solution Approach 1:
The surface fastener is divided into multiple segments or strips along its longitudinal direction. This segmentation allows each segment to independently accommodate the dimensional changes that occur during tire inflation and vulcanization, preventing the entire fastener from detaching while maintaining its fastening function
Solution Approach 2:
The surface fastener is designed with flexible segments that can dynamically adjust to the changing dimensions of the tire during inflation and vulcanization. The segmented structure allows the fastener to stretch and deform elastically with the tire, maintaining continuous contact and adhesion throughout the molding process
3Ease of manufacture
If the surface fastener dimension is reduced to fit during molding, then the fastener can be mounted during the molding process, but the fastener cannot meet resistance when lifted and falls off
Solution Approach 1:
By dividing the fastener into segments, each segment can be optimized to maintain sufficient width and strength to resist lifting forces, while the overall fastener system remains flexible enough to accommodate molding process dimensional changes
Solution Approach 2:
The surface fastener utilizes composite material properties that combine high tensile strength to resist lifting forces with sufficient flexibility to accommodate the dimensional changes during molding, achieving both mounting ease during molding and adequate resistance strength
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 allows for efficient mounting of surface fasteners during the tire molding process while preventing them from falling off, ensuring secure adhesion and maintaining the integrity of the fastener and adhesive rubber layer, thereby enhancing production efficiency and preventing adhesion failure.
Implementation Method 1
a band-shaped surface fastener extending in a tire circumferential direction is mounted on a tire inner surface
Data Source
AI summary
Provided are a pneumatic tire where a band-shaped surface fastener extending in a tire circumferential direction is mounted on a tire inner surface, a cut portion composed of a group of a plurality of notches extending in a width direction of this surface fastener without traversing this surface fastener is formed in this surface fastener repetitively along the tire circumferential direction, the surface fastener is divided into a plurality of components by these notches, and the surface fastener is disposed on the tire inner surface in a state where the cut portion is stretched so the components are continuous in the tire circumferential direction.