Antistatic Resin Container Exchange by Heat Discoloration

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Solution Overview

Problem

The leakage of carbon black and carbon fiber from resin compositions used in trays for storing electronic parts leads to adhesion and potential damage, degrading the tray's appearance and inconveniencing the electronic parts, while surfactant-containing trays suffer from bleeding-out issues, also causing inconvenience.

Innovation Solution

A method for determining the exchange timing of containers by observing discoloration and surface electric resistance changes, using a resin composition with antistatic agents like polyphenylene ether and styrenic resins, without carbon black or carbon fiber, to ensure effective antistatic performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If carbon black-containing resin composition is used to form the tray, then antistatic performance is improved, but carbon black leaks out to the tray surface causing powder fall and adhesion to electronic parts

Engineering Contradiction:

Improveantistatic performanceVSAvoidcarbon black leakage and adhesion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the physical and chemical parameters of the antistatic agent by using a polymer type antistatic agent with specific molecular weight (500 or more) instead of conventional carbon black. This parameter change eliminates the leakage issue while maintaining antistatic performance through the polymer's molecular structure that prevents migration to the surface.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite resin composition by combining polyphenylene ether-based resin with a polymer type antistatic agent. This composite material integrates the base resin's structural properties with the antistatic agent's electrification prevention function, achieving both durability and antistatic performance without carbon black leakage.

Inventive Principle:

Principle #40Composite materials

2Reliability

If carbon fiber is used as antistatic agent, then antistatic performance is improved, but carbon fiber protrudes from tray surface causing damage to electronic parts terminals

Engineering Contradiction:

Improveantistatic performanceVSAvoidcarbon fiber protrusion and damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical form parameter of the antistatic agent from fibrous (carbon fiber) to polymeric form. This parameter change eliminates the protrusion issue while maintaining antistatic performance through the polymer's molecular structure that remains embedded in the resin matrix.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If surfactant-containing resin composition is used to form the tray, then antistatic performance is improved, but surfactant bleeds out to the tray surface causing adhesion to electronic parts

Engineering Contradiction:

Improveantistatic performanceVSAvoidsurfactant bleeding and adhesion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical parameter of the antistatic agent by selecting a polymer type with high molecular weight (500 or more) instead of low molecular weight surfactants. This parameter change prevents bleeding while maintaining antistatic performance through the polymer's molecular structure that resists migration.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent accepts that the tray has a limited service life and should be exchanged when discoloration occurs, rather than attempting to create a permanently maintenance-free product. This approach acknowledges that visual degradation indicates internal material changes that may affect antistatic performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

Enables easy exchange of containers at the right time, maintaining antistatic functionality and preventing issues with electronic parts, without special measurement apparatuses.

Implementation Method 1

a resin composition is used, which contains an antistatic agent... it is said that the problem of generation of static electricity (electrification) is improved

Methodology Applied

Scientific EffectAntistatic agent function: Electrostatics

Implementation Method 2

at a time when (a surface electric resistance value of the container having been changed by heating of the container) is ten times of (a surface electric resistance value of the container at a time of starting the heating), discoloration of the container caused by the heating is a recognizable degree

Methodology Applied

Scientific EffectThermal discoloration: Heating

Data Source

PatentUS12492069B2Container

Publication Date: 2025.12.09 AKIMOTO SEISAKUSYO CO LTD

AI summary

A method in which a storage container composed of a resin and an antistatic agent is assessed for suitability of storing an electric product by visually inspection of the container such that discoloration induced by heating is correlative to surface electric resistance.