Tyre Mould Insert Geometry for Readable QR Code Vulcanising
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Solution Overview
Problem
The existing processes for moulding QR codes on tyre sidewalls are costly and prone to wear, with increased roughness leading to tearing issues during detachment from the mould and compromising the code's readability.
Innovation Solution
An insert with projections inclined at 10° to 25° and roughness between 4 to 11 μm is used in the mould, allowing for high contrast and precise imaging of QR codes without tearing the elastomeric material, optimized by balancing inclination and roughness parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the roughness of the insert surface is increased to improve QR code contrast and readability, then the optical contrast of the QR code is improved, but the elastomeric material tears during detachment from the mould
Solution Approach 1:
The invention optimizes the insert surface roughness parameter to a specific range (Ra 0.4-1.2 μm) that provides sufficient optical contrast for QR code readability while preventing excessive adhesion that would cause material tearing during detachment
Solution Approach 2:
The insert projections are designed with asymmetric geometry, having a rounded apex rather than a sharp point, which reduces stress concentration on the elastomeric material during detachment while maintaining the optical contrast needed for QR code formation
2Loss of information
If conventional processes are used to mould QR codes on tyre sidewalls, then the coding information can be displayed, but the process is costly and the codes are prone to wear
Solution Approach 1:
The invention uses a removable insert that can be detached and replaced, allowing the QR code pattern to be copied onto the tyre sidewall through the elastomeric material without permanently modifying the mould, thereby reducing manufacturing costs and enabling code updates
Solution Approach 2:
The QR code pattern is pre-formed on the removable insert before the vulcanisation process, allowing the code to be imprinted on the tyre sidewall during moulding without requiring subsequent costly post-processing operations
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 solution enables high-definition, high-contrast QR code images on the tyre sidewalls that are resistant to wear and easy to read, while also ensuring smooth detachment from the mould, maintaining the tyre's integrity and readability.
Implementation Method 1
The different optical properties make it possible to identify the type of basic units using an optical reader, which transforms them into binary code
Implementation Method 2
said lateral surface has a roughness between 4 and 11 μm
Data Source
AI summary
An insert for a mould for vulcanising tyres for vehicle wheels, the insert arranged to receive in a seat formed on a moulding surface of the mould and comprising a base surface from which a plurality of projections extends; wherein, each projection comprises a lateral surface extending away from the base surface such that the lateral surface defines a tapered profile of the projection away from the base surface, is inclined at an angle between 10° and 25° with respect to a direction perpendicular to the base surface, and has a roughness between 4 and 11 μm.