Tire Vulcanization Mold Parting Line Placement

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Rubber squeezed out from mold parting lines on the tread portion of tires can impair the outward appearance, as it is not seamlessly integrated into the tire's design.

Innovation Solution

The tire vulcanization mold is designed with mold parting lines located at bend points of the tread portion's surface design, allowing the squeezed-out rubber to be perceived as part of the pattern, enhancing the appearance by positioning these lines to coincide with the tread's design features such as ridge lines and land portions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If mold parting lines are disposed to the sidewall portion, then rubber squeezed out is limited to less noticeable areas, but the mold structure becomes more complex and productivity decreases

Engineering Contradiction:

Improveoutward appearance qualityVSAvoidmolding efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The mold is divided into multiple sectors that can be separated, allowing the parting lines to be positioned strategically in the tread portion rather than the sidewall, resolving the contradiction between appearance quality and molding efficiency

Inventive Principle:

Principle #1Segmentation

2Productivity

If mold parting lines are disposed to the tread portion, then molding efficiency is improved, but rubber squeezed out from the mold parting lines may impair the outward appearance

Engineering Contradiction:

Improvemolding efficiencyVSAvoidoutward appearance quality

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent positions the mold parting lines to pass through bend points of the tread pattern design, converting the potentially harmful squeezed-out rubber into a feature that aligns with the aesthetic design lines of the tire tread

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The parting lines are strategically positioned at specific locations (bend points of surface design) rather than uniformly distributed, allowing the squeezed rubber to occur only at aesthetically acceptable locations within the tread pattern

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10843426B2Tire vulcanization mold, tire vulcanization device, and tire production method

Publication Date: 2020.11.24 TOYO TIRE CORP

AI summary

A tire vulcanization mold disclosed herein includes sectors 13 divided in a tire circumferential direction and molding a tread portion 1 of a tire, and a pair of upper and lower side plates 11 and 12 molding a sidewall portion 2 of the tire. Mold parting lines 16a and 17a formed by the sectors 13 and a pair of the upper and lower side plates 11 and 12 are located in the tread portion 1 and set to pass a bend point 8c of a surface design in the tread portion 1.