Vacuum-Packed High Purity Tin With Fluorocarbon Resin Sheet

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Solution Overview

Problem

High purity tin products often contaminate with carbon impurities when heated and melted, leading to undesirable particle formation during further processing.

Innovation Solution

Vacuum-packing high purity tin using a fluorocarbon resin sheet, such as polytetrafluoroethylene (PTFE), interposed between a polyethylene sheet and the tin, significantly reduces carbon deposits, allowing the tin to be used immediately without washing after opening the packaging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high purity tin is vacuum-packed using a polyethylene sheet, then the tin is protected from oxidation and contamination, but carbon impurities contaminate the tin when heated and melted, causing particle formation

Engineering Contradiction:

Improveprotection from oxidationVSAvoidcarbon impurity contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A fluorocarbon resin sheet is introduced as an intermediary layer between the polyethylene vacuum packing sheet and the high purity tin. This intermediate layer prevents direct contact between the polyethylene and tin surface, thereby blocking carbon impurity contamination while maintaining the vacuum packing's protective function against oxidation

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The packaging system uses a composite structure combining fluorocarbon resin sheet and polyethylene sheet. The fluorocarbon resin layer (0.01-5.0 mm thick) serves as the inner protective layer直接接触 the tin, while the polyethylene layer provides outer protection, creating a multi-functional composite packaging system

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If the tin surface is covered with a fluorocarbon resin sheet, then carbon deposits are reduced, but the packaging structure becomes more complex

Engineering Contradiction:

Improvecarbon depositsVSAvoidpackaging structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The fluorocarbon resin is applied as a thin film or sheet (0.01-5.0 mm thickness) that can conform to the tin surface. This flexible thin film approach provides effective carbon contamination protection without requiring complex rigid structures, maintaining simplicity in the packaging design

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS10781024B2Method for vacuum packing high-purity tin and vacuum-packed high purity tin

Publication Date: 2020.09.22 JX NIPPON MINING & METALS CORP

AI summary

Provided is a high-purity tin product that does not contain undesirable carbonaceous impurities as a result of the following: a vacuum-packed high-purity metal article (vacuum-packed high-purity tin article) is obtained by vacuum packaging a high-purity metal (high-purity tin), at least a portion of a surface of a high-purity metal being covered with a fluorocarbon resin sheet; and the vacuum-packed high-purity metal article(vacuum-packed high-purity tin article) is obtained by vacuum packaging, with a vacuum packaging film, the high-purity metal in which at least a portion of a surface is covered with the fluorocarbon resin sheet.