Transfer Molding Mold for Vulcanized Rubber Boots
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Solution Overview
Problem
The manufacturing of vulcanized rubber boots faces challenges due to the poor flow characteristics of rubber materials, leading to difficulties in achieving overall transfer molding and resulting in high scrap rates and increased production costs, especially when integrating boot linings with foam or thermal insulation materials.
Innovation Solution
A transfer molding mold and equipment system that includes a combined tube mold, a last mold with partition elements, and a rubber injection guide plate to facilitate the injection of unvulcanized mixed rubber into a partitioned transfer molding cavity, allowing for the formation of a unitary vulcanized rubber boot with a tube, sole, and boot lining through integral transfer molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual stacking of rubber sheets is used to form the boot tube, then the production process is flexible and adaptable, but water leakage occurs frequently and scrap rate increases
Solution Approach 1:
The patent replaces the manual mechanical stacking process with an automated injection molding system. The injection head automatically injects unvulcanized rubber material into the mold cavity, which is then vulcanized to form the boot tube. This substitution eliminates manual operation inconsistencies and ensures uniform, leak-free joints, resolving the waterproof performance issue while maintaining production flexibility through programmable control.
Solution Approach 2:
The patent utilizes the phase transition of rubber material from unvulcanized (moldable) state to vulcanized (solid) state. The unvulcanized rubber is injected in a soft, flowable state to fill the mold cavity completely, then vulcanized under heat and pressure to form a strong, waterproof structure. This phase transition enables automated molding while ensuring reliable waterproof performance.
2Device complexity
If semi-automated production lines are used, then equipment complexity is reduced, but manufacturing precision and uniformity deteriorate
Solution Approach 1:
The patent merges the injection and vulcanization processes into a single integrated operation. The injection head is positioned within the vulcanization chamber, allowing unvulcanized rubber to be injected and immediately vulcanized in one continuous process. This merging ensures precise control over material placement and vulcanization conditions, achieving uniform joint quality without requiring complex multi-stage equipment.
Solution Approach 2:
The patent introduces an intermediary substance (unvulcanized rubber) that serves as a bridge between the injection process and the final vulcanized product. This intermediary material can be easily injected and shaped, then transformed into the final waterproof structure through vulcanization. This approach simplifies equipment requirements while ensuring manufacturing precision.
3Ease of manufacture
If rubber sheets are pre-manufactured and manually applied, then material flow characteristics are easier to control, but production efficiency decreases and labor intensity increases
Solution Approach 1:
The patent extracts the rubber material from pre-manufactured sheet form and introduces it directly as unvulcanized material into the injection system. This eliminates the need for separate sheet manufacturing, storage, and handling steps. The material is processed and formed in one continuous operation, significantly improving production efficiency while maintaining ease of manufacture through automated material feeding.
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 solution enables the production of vulcanized rubber boots with reduced water leakage issues and lower scrap rates by ensuring uniform injection and vulcanization of rubber, thereby improving manufacturing efficiency and reducing production costs.
Implementation Method 1
A transfer molding mold and equipment system that includes a combined tube mold, a last mold with partition elements, and a rubber injection guide plate to facilitate the injection of unvulcanized mixed rubber into a partitioned transfer molding cavity
Implementation Method 2
enables the production of vulcanized rubber boots with reduced water leakage issues and lower scrap rates by ensuring uniform injection and vulcanization of rubber
Data Source
AI summary
The present invention provides a transfer molding mold for a vulcanized rubber boot, comprising: a combined tube mold, having an inner cavity corresponding to a tube of the rubber boot a last mold with partition elements, having a main body substantially corresponding to the tube of the rubber boot in shape, and two or more partition elements disposed on the main body, wherein the last mold is suitable for installation into the inner cavity of the tube mold to form a transfer molding cavity between the wall of the inner cavity of the tube mold and the outer surface of the last mold, and the transfer molding cavity is partitioned into two or more parts by the last mold and the tube mold; and a rubber injection guide plate suitable for installation to the top of the tube mold to guide injection of unvulcanized mixed rubber, comprising a plate body, wherein the plate body is provided with: a rubber injection port to be connected with an external injection head to inject the unvulcanized mixed rubber; and an annular rubber injection channel for introducing the externally injected unvulcanized mixed rubber into the transfer molding cavity in an annular distribution manner.