Gasket Venting Structure to Prevent Demolding Damage

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Solution Overview

Problem

The existing gasket manufacturing methods risk damaging the gasket during demolding due to the air vent hole extending from the molding cavity, affecting sealing performance.

Innovation Solution

A gasket manufacturing method that includes an exhaust groove and hole system to discharge gas from the cavity, preventing residual gas and controlling filling pressure, ensuring the gasket is not damaged during demolding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the air vent hole extends from the molding cavity toward the tip side of the gasket, then gas can be discharged from the cavity, but the rubber-like elastic material enters the air vent hole and protrudes toward the tip side, requiring removal that may damage the gasket

Engineering Contradiction:

Improvegas discharge capabilityVSAvoidgasket integrity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The air vent is divided into two separate components: an exhaust groove extending from the cavity on the butting surface, and an exhaust hole extending from the exhaust groove in the clamping direction. This segmentation prevents the rubber-like elastic material from directly entering a continuous vent channel that would protrude toward the gasket tip, eliminating the need for damaging removal operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of having the air vent hole extend from the cavity toward the gasket tip (conventional approach), the invention inverts the structure by having the exhaust groove extend from the cavity toward the butting surface, and the exhaust hole extend perpendicular to this in the clamping direction. This inverted configuration achieves gas discharge functionality without creating protruding material toward the gasket tip.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If simple removal method is used by pulling off the protruding portion, then demolding is simplified, but the gasket may be damaged and sealing performance affected

Engineering Contradiction:

Improvedemolding simplicityVSAvoidsealing performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention extracts the harmful protruding portion by redesigning the air vent structure. The exhaust groove and exhaust hole configuration ensures that rubber-like elastic material does not enter and protrude toward the gasket tip, thereby eliminating the need for post-molding removal operations that could damage the gasket and compromise sealing performance.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If the exhaust groove opens fully in the circumferential direction, then gas discharge is efficient, but rubber-like elastic material may enter the exhaust groove

Engineering Contradiction:

Improvegas discharge efficiencyVSAvoidmaterial contamination

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The exhaust groove is designed to be partially opening in the circumferential direction rather than fully open. This localized opening configuration provides sufficient gas discharge pathways while limiting the exposure area where rubber-like elastic material could enter, thus balancing gas discharge efficiency with prevention of material contamination.

Inventive Principle:

Principle #3Local quality

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

Prevents molding defects and maintains stable sealing performance by avoiding damage to the gasket during the manufacturing process.

Implementation Method 1

An air vent is provided including an exhaust groove and an exhaust hole, the exhaust groove being provided extending out from the cavity toward an inner peripheral side or an outer peripheral side on a butting surface between the base material and the first split mold and partially opening in a circumferential direction of the cavity, the exhaust hole extending out from the exhaust groove in a clamping direction of the first split mold and the second split mold. A gas in the cavity is discharged through the air vent at the time of injection and filling of the rubber-like elastic material into the cavity.

Methodology Applied

Scientific EffectGas discharge through exhaust groove and hole:

Data Source

PatentEP4147842B1Gasket member manufacturing method

Publication Date: 2025.12.03 SUMITOMO RIKO CO LTD

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AI summary

Provided are a novel method for manufacturing a gasket member capable of preventing molding defects, damage and the like during molding of a gasket, and the gasket member. A method for manufacturing a gasket member 10, comprising clamping a plate-like base material 12 between a first split mold 32 and a second split mold 34, and injecting and filling a rubber-like elastic material into a cavity 38 of a gasket 14 defined between the base material 12 and the first split mold 32 to fix the gasket 14 to a surface 16 of the base material 12, the gasket member 10 being provided with an air vent 50 that has an exhaust groove portion 52 extending from the cavity 38 toward the inner peripheral side or the outer peripheral side on the abutting surface between the base material 12 and the first split mold 32 and partially opened in the circumferential direction of the cavity 38, and an exhaust hole portion 56 extending from the exhaust groove portion 52 in the clamping direction of the first split mold 32 and the second split old 34, wherein air in the cavity 38 is discharged through the air vent 50 when the rubber-like elastic is injected and filled into the cavity 38.