Scratch-Resistant Plastic Cuvettes via Surface Coating

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Solution Overview

Problem

Conventional plastic cuvettes used in automated analytical instruments suffer from scratch resistance issues during storage and transport as bulk goods, leading to impaired optical analysis precision due to surface scratches, particularly in scattered-light measurements.

Innovation Solution

The outer surface of transparent plastic cuvettes is treated with a liquid containing at least one surfactant or triglyceride, followed by drying, to enhance scratch resistance without increasing production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional plastic cuvettes are stored and transported as bulk goods, then productivity and ease of operation are improved, but the outer surface of cuvettes gets scratched due to constant rubbing, impairing optical analysis precision

Engineering Contradiction:

Improvethroughput of analyses per hourVSAvoidoptical analysis precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies a scratch-resistant coating to the outer surface of cuvettes before they are stored and transported as bulk goods. This preliminary protective action prevents scratches from occurring during handling and storage, allowing the cuvettes to be stored in bulk without compromising optical analysis precision. The coating acts as a sacrificial layer that protects the underlying plastic surface from abrasion.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent creates a composite structure by combining the plastic cuvette material with a scratch-resistant coating layer. This composite material approach allows the cuvette to maintain its optical properties while gaining enhanced surface durability. The coating layer provides the scratch resistance needed for bulk storage, while the underlying plastic maintains its optical transparency and measurement properties.

Inventive Principle:

Principle #40Composite materials

2Strength

If more scratch resistant plastics such as cycloolefin copolymers are used, then scratch resistance is improved, but production costs increase significantly

Engineering Contradiction:

Improvescratch resistanceVSAvoidproduction cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

Instead of using expensive scratch-resistant plastics throughout the entire cuvette, the patent applies a scratch-resistant coating only to the outer surface where scratches occur during handling. This local application of protective properties allows conventional, cost-effective plastic materials to be used for the cuvette body, significantly reducing production costs while still providing the necessary scratch resistance at the critical surface area.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses disposable cuvettes made from conventional plastic materials that are inexpensive to manufacture. Rather than investing in expensive durable materials, the approach accepts that these cuvettes are single-use items, but the scratch-resistant coating ensures they remain scratch-free during their brief handling and storage period before use, maintaining measurement precision without increasing material costs.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If the measuring window is provided with a protecting raised frame, then scratch resistance of the measuring window is improved, but device complexity and production costs increase

Engineering Contradiction:

Improvescratch resistance of measuring windowVSAvoidcuvette design complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent extracts the protective function from the cuvette's structural design and implements it as a separate coating layer applied to the outer surface. Instead of incorporating a raised frame structure that would complicate the cuvette design and increase manufacturing steps, the protective function is achieved through a simple surface coating that can be applied uniformly without modifying the basic cuvette geometry or adding structural complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

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

The method significantly improves the abrasion resistance of cuvettes made from polymethyl methacrylate or polystyrene, preventing scratches and maintaining optical analysis precision, while being cost-effective compared to using more expensive scratch-resistant plastics or complex cuvette designs.

Implementation Method 1

the outer surface of a measuring cuvette consisting of transparent plastic is brought into contact with a liquid comprising at least one surfactant

Methodology Applied

Scientific EffectSurfactant: Surfactant

Implementation Method 2

a liquid comprising at least one surfactant and is subsequently dried

Methodology Applied

Scientific EffectSurface tension reduction: Surface Tension

Data Source

PatentUS11072717B2Plastic cuvettes having increased scratch resistance and methods for increasing the scratch resistance of same

Publication Date: 2021.07.27 SIEMENS HEALTHCARE DIAGNOSTICS PRODS

AI summary

In the field of consumable materials for automatic analytical instruments, transparent plastic cuvettes having increased scratch resistance and a method for producing same includes contacting exclusively an outer surface of the transparent plastic cuvette with a liquid comprising at least one surfactant or with a triglyceride and subsequently drying the outer surface such that scattered-light optical properties of the transparent plastic are not adversely affected.