Shoe Molding Process Integrating Inner Lining

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Solution Overview

Problem

Conventional rubber shoe production is cumbersome and costly due to the need for manual operation and additional procedures to attach an inner lining, making it inefficient for mass production and lacking in terms of oil resistance, slipping resistance, high temperature resistance, and cold resistance compared to rubber shoes.

Innovation Solution

A molding process that combines the shoe shell and inner lining using a combined external mold and molding inner core, where the inner lining is sleeved and vulcanized with the semi-molded shell to produce a shoe with inner lining, eliminating the need for manual pasting or sewing and improving production efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If manual operation and additional procedures are used to attach inner lining to rubber shoe body, then the shoe can be produced with inner lining, but the production process becomes cumbersome and costly

Engineering Contradiction:

Improveproduction process simplicityVSAvoidproduction efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent combines the inner lining and shoe body into a single integrated structure by injecting rubber material directly into the mold cavity that contains the inner lining. This merging eliminates the need for separate attachment operations (pasting or sewing), simplifying the manufacturing process and improving productivity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The inner lining is placed into the mold cavity before the rubber injection process. This preliminary positioning allows the rubber material to directly encapsulate and bond with the inner lining during molding, eliminating subsequent attachment steps and reducing production complexity.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If manual pasting or sewing is used to connect shoe body and inner lining, then the finished shoe can be assembled, but additional procedures require more manpower and material resources

Engineering Contradiction:

Improvemass production capabilityVSAvoidproduction process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces manual mechanical operations (pasting or sewing) with an automated rubber injection molding process. The rubber material is injected under pressure to form the shoe body that integrates with the inner lining, eliminating the need for manual assembly operations and reducing production process complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the physical state and bonding mechanism from mechanical attachment (pasting or sewing) to chemical/thermal bonding through rubber vulcanization. The rubber material transitions from a liquid or semi-liquid state during injection to a cured solid state that permanently bonds with the inner lining, simplifying the overall process.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If plastic material is used to make shoes with linings, then the molding process is mature and efficient, but the shoes lack oil resistance, slipping resistance, high temperature resistance and cold resistance

Engineering Contradiction:

Improvemolding process efficiencyVSAvoidfunctional performance (oil resistance, slipping resistance, temperature resistance)

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses rubber material instead of plastic for the shoe body while maintaining the efficient injection molding process. Rubber provides the required functional performance (oil resistance, slipping resistance, temperature resistance) while the injection molding technique ensures high productivity and process maturity similar to plastic manufacturing.

Inventive Principle:

Principle #40Composite materials

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 process enhances production efficiency, reduces production costs, and ensures the quality of rubber shoes with inner lining, improving user experience by integrating the inner lining directly into the molding process.

Implementation Method 1

heating to vulcanize the semi-molded shell, and combining with the inner lining to produce a shoe with inner lining

Methodology Applied

Scientific EffectVulcanization:

Data Source

PatentUS12083762B2Molding process for shoes with inner lining

Publication Date: 2024.09.10 GUANGZHOU JINGCHENG RUBBER PROD CO LTD

AI summary

A molding process for shoes with inner lining comprises: placing a molding inner core sleeved with an inner lining in a combined external mold being preset with a semi-molded shell; performing a mold-closing action to make the semi-molded shell in the first external mold and the second external mold attach to the inner lining, respectively; and heating to vulcanize the semi-molded shell, and combining with the inner lining to produce a shoe with inner lining.