Barrel-Shaped Seal Element Without Mold Line Sealing Defects

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing sealing gaskets with mold joint lines, ejector marks, burrs, and runner entry marks suffer from sealing weaknesses, deformation, and loss of integrity over time due to pressure, leading to gaps and sealing failures.

Innovation Solution

A barrel-shaped sealing gasket without mold joint lines, ejector marks, burrs, or runner entry marks, designed for easy molding and removal from molds without cores, ensuring a smooth, flexible, and high-temperature-resistant sealing surface that maintains mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional sealing elements (oring, gasket) are used for sealing, then sealing function is provided, but mold joint lines, runner entry marks, burrs, and offset are created on sealing surfaces causing sealing weaknesses

Engineering Contradiction:

Improvesealing functionVSAvoidsealing surface quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The sealing element is merged directly into the mold cavity as an integrated component. The sealing gasket is formed as part of the mold structure itself, eliminating the need for separate sealing elements and the associated defects from injection molding processes.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The harmful elements (mold joint lines, runner entry marks, burrs, offset) are completely removed from the sealing surface by using the mold cavity wall itself as the sealing element, rather than adding separate sealing components that would require injection molding.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If sealing elements are compressed between two hard plastics, then sealing is ensured initially, but the sealing elements lose properties over time due to pressure causing gaps and sealing failures

Engineering Contradiction:

Improvesealing integrityVSAvoidsealing durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The mold cavity wall itself serves as the sealing element. The hard plastic structure of the mold provides both the sealing function and the structural support, eliminating the need for separate sealing elements that would degrade under compression.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The sealing surface of the mold cavity is designed with a specific curvature (cambered structure) that allows the sealing element to flex and conform to the surface, distributing pressure evenly and preventing stress concentration that would lead to degradation.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Shape

If cores are used to mold undercuts in the mold, then complex shapes can be formed, but the molding process becomes more complex and removal requires additional mechanisms

Engineering Contradiction:

Improveundercut formationVSAvoidmolding process complexity

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

Instead of using cores to create undercuts and then requiring complex mechanisms to remove them, the sealing element is designed to be removed in the direction opposite to the conventional approach - the sealing element itself forms the undercut shape without requiring separate core mechanisms.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20230341053A1Barrel-shaped seal element

Publication Date: 2023.10.26 SERDAR PLASTIK SANAYI TICARET AS

AI summary

The subject of the present invention relates to a sealing gasket that has a section formed like a barrel, that does not have mold joint line, ejector marks, burrs, offset and runner entry marks for perfect sealing, that can be easily molded and can be removed from the mold without a core in order to be used in all required areas where sealing is required and the application surfaces are suitable for the structure of the gasket.