Multicolor Foamed Shoe Body Joining Before Supercritical Expansion
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Solution Overview
Problem
Conventional methods for manufacturing multicolor shoe bodies involve labor-intensive manual adhesion, toxic chemical primers, and generate environmental waste and pollution, while existing supercritical foaming methods produce non-reusable foamed waste.
Innovation Solution
A method involving hot pressing of colored cold shot models to form a semi-finished product, followed by supercritical foaming to create a monolithic multicolor-foamed shoe body without additional processing, reducing waste and adhesion costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional manual adhering process with chemical primer and conveyor oven is used, then adhesive strength is ensured, but labor cost increases and environmental pollution occurs
Solution Approach 1:
The patent extracts and eliminates the harmful chemical primer and conveyor oven heating processes from the manufacturing system. By using hot-pressing mold directly integrated with the injection molding machine, the adhesive application and surface treatment steps are removed entirely, achieving strong bonding without toxic chemicals and excessive energy consumption.
Solution Approach 2:
The patent merges the injection molding process with the hot-pressing bonding process into a single integrated system. The hot-pressing mold is directly integrated with the injection molding machine, allowing the shoe components to be molded and bonded in one continuous operation, eliminating separate adhesive application and heating steps.
2Productivity
If supercritical foaming is performed on cold shot model in advance, then foamed shoe material is obtained, but foamed waste is generated that is not reusable
Solution Approach 1:
The patent performs the foaming action at the appropriate time during the molding process rather than in advance. By using cold shot models (unfoamed) and performing supercritical foaming after the components are assembled in the hot-pressing mold, the process ensures that any waste generated remains unfoamed and reusable, eliminating the waste problem caused by premature foaming.
3Extent of automation
If cold shot models are engaged through hot pressing, then manual adhesive application is eliminated, but additional processing steps are required
Solution Approach 1:
The patent merges the injection molding and hot-pressing bonding processes into a single integrated system. The hot-pressing mold is directly integrated with the injection molding machine, allowing cold shot models to be molded and automatically engaged through hot pressing in one continuous operation, eliminating manual adhesive application without adding significant process complexity.
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 saves labor and adhesion costs, reduces waste, and provides an environmentally friendly process, producing a recyclable and multifunctional multicolor shoe body with varied colors and properties.
Implementation Method 1
place the semi-finished product in a supercritical foaming autoclave for foam molding to obtain the multicolor-foamed shoe body
Implementation Method 2
supercritical foaming and the multicolor-foamed shoe body
Implementation Method 3
place the cold shot models in a hot-pressing mold for hot pressing to make a contacting surface of any two cold shot models that are adjacent engage with each other due to heating
Data Source
AI summary
A method of manufacturing a multicolor-foamed shoe body by supercritical foaming includes step S1 to step S3: step S1: provide a plurality of cold shot model molds and inject a plurality of foaming materials in different colors into a cavity of each of the cold shot model molds to form a plurality of cold shot models in different colors that is unfoamed; step S2: place the cold shot models in a hot-pressing mold for hot pressing to make a contacting surface of any two of the cold shot models that are adjacent engage with each other due to heating to foam a semi-finished product; and step S3: place the semi-finished product in a supercritical foaming autoclave for foam molding to obtain the multicolor-foamed shoe body. Additionally, the multicolor-foamed shoe body manufactured by the method is also disclosed in the present invention.