Two-Stage Mold Process for Footwear Midsole Color Bleeding
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Solution Overview
Problem
Conventional midsole manufacturing methods result in color bleeding between different colored portions, compromising the aesthetic appeal of athletic footwear.
Innovation Solution
A method involving the use of a two-stage mold process where preforms are heated and expanded in a first mold to form a midsole preform with a peripheral flange, then compressed in a second mold to minimize color bleeding and enhance aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a midsole is formed in a mold assembly using conventional single-stage molding, then the manufacturing process is simple and efficient, but color bleeding occurs between different colored portions, decreasing aesthetic appeal
Solution Approach 1:
The molding process is divided into two distinct stages: a first mold stage for forming the midsole preform with peripheral flange, and a second mold stage for compressing and finishing. This segmentation allows each stage to be optimized independently, with the first stage preserving color boundaries and the second stage completing the compression without causing color bleeding.
Solution Approach 2:
The midsole preform is formed in a first mold with a peripheral flange before being transferred to the second mold. This preliminary action of forming the preform with the flange in the first mold allows the material to be properly positioned and secured in the second mold during compression, preventing color bleeding while maintaining manufacturing efficiency.
2Manufacturing precision
If the midsole is compressed in a single stage, then the manufacturing process is simple, but color bleeding occurs and aesthetic appeal is compromised
Solution Approach 1:
The compression process is segmented into two stages: first forming the preform with peripheral flange in a first mold, then compressing in a second mold. This segmentation allows the material to be properly set in the first stage before compression in the second stage, preventing color bleeding while maintaining productivity through efficient two-stage processing.
Solution Approach 2:
The peripheral flange is formed as part of the preform in the first mold before the compression stage. This preliminary formation of the flange structure provides a secure boundary that prevents color bleeding during the subsequent compression process in the second mold, while the entire two-stage process remains efficiently integrated.
3Productivity
If different colored portions are formed in a single mold, then the process is efficient, but color bleeding occurs between portions
Solution Approach 1:
The molding process is segmented into two stages where the first mold forms the preform with peripheral flange and the second mold completes the compression. This segmentation allows color boundaries to be established in the first stage before compression in the second stage, preventing color bleeding while maintaining overall processing efficiency through the two-stage approach.
Solution Approach 2:
The preform with peripheral flange is formed in the first mold as a preliminary step before compression in the second mold. This preliminary formation establishes the color boundaries and structural integrity before compression, preventing color bleeding while maintaining manufacturing efficiency through the optimized two-stage process.
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 reduces color bleeding, improving the aesthetic appeal and performance characteristics of the midsole by allowing for distinct color portions with varied physical properties.
Implementation Method 1
heating the first mold for a predetermined period of time at a predetermined temperature such that the first and second preforms expand within the preform recess and into the peripheral overflow chamber
Implementation Method 2
placing the midsole preform in a midsole recess of a second mold and the peripheral preform flange in a peripheral recess of the second mold, closing the second mold by positioning the first and second portions in contact with one another, thereby compressing the midsole preform and the peripheral preform flange
Data Source
AI summary
A method of manufacturing a midsole for an article of footwear includes placing first and second preforms in a first mold, closing and heating the first mold to produce a midsole preform with a peripheral preform flange, removing the midsole preform from the first mold and allowing it to further expand and cool, placing the midsole preform in a second mold, with a volume of a midsole recess of the second mold being less than a volume of the midsole preform, and a volume of a peripheral recess of the second mold being less than a volume of the peripheral preform flange, closing the second mold thereby compressing the midsole preform and the peripheral preform flange, and heating the second mold to form a midsole with a peripheral flange, allowing the second mold to cool, opening the second mold, and cutting away a peripheral flange of the midsole.