Paper Substrate Circuit Board for Non-Combustion Flavor Inhaler

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Solution Overview

Problem

Existing non-combustion flavor inhalers face challenges in achieving heat resistance and efficient vaporization/atomization of inhalation components, particularly with substrates like paper that degrade excessively at high temperatures, and in maintaining the integrity of electrically conductive ink patterns during thermal cycles.

Innovation Solution

A circuit board with a paper substrate that exhibits low weight loss up to 290°C, combined with an electrically conductive ink pattern formed on an intermediate layer containing cellulose nanofibers and silica, and a coating layer with a melting point below the boiling point of inhalation components, ensuring heat resistance and efficient vaporization/atomization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If paper substrate is used for circuit board, then ease of manufacture and flexibility are improved, but heat resistance deteriorates due to excessive degradation at high temperatures

Engineering Contradiction:
Improveease of manufactureVSAvoidheat resistance
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent applies parameter changes by selecting paper with specific thermal degradation characteristics where the weight loss from room temperature to 290°C is less than 20% of the total weight loss from room temperature to 900°C. This parameter specification ensures the paper maintains structural integrity at operating temperatures while remaining manufacturable.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining paper substrate with electrically conductive ink patterns and intermediate layers. This composite structure leverages the manufacturing advantages of paper while adding functional layers that provide heat resistance and electrical conductivity, resolving the contradiction between ease of manufacture and heat resistance.

Inventive Principle:
Principle #40Composite materials

2Adaptability or versatility

If paper substrate is used for circuit board, then flexibility and cost are improved, but substrate degradation at high temperature worsens

Engineering Contradiction:
ImproveflexibilityVSAvoidsubstrate degradation
Core Design Contradiction:
Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent changes the thermal stability parameter of the paper substrate by selecting papers with specific degradation profiles. The requirement that weight loss to 290°C be less than 20% of total weight loss to 900°C ensures the substrate maintains compositional stability at operating temperatures while retaining flexibility for various applications.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies beforehand cushioning by pre-selecting paper substrates with inherent thermal stability characteristics before the vaping process begins. The paper's controlled degradation profile acts as a buffer, preventing catastrophic failure at operating temperatures and maintaining substrate integrity throughout the product lifecycle.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

3Device complexity

If electrically conductive ink pattern is printed directly on paper, then manufacturing simplicity is improved, but ink pattern integrity deteriorates during thermal cycles

Engineering Contradiction:
Improvedevice complexityVSAvoidink pattern integrity
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent introduces an intermediate layer as a mediator between the paper substrate and the electrically conductive ink pattern. This intermediate layer protects the ink pattern from direct thermal stress and paper degradation, maintaining ink integrity during thermal cycles while adding minimal complexity to the manufacturing process.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure with three layers: paper substrate, intermediate layer, and electrically conductive ink pattern. This composite approach distributes thermal stress across layers, protecting the ink pattern while maintaining manufacturing simplicity through a straightforward lamination process.

Inventive Principle:
Principle #40Composite materials

4Productivity

If coating layer with low melting point material is added, then vaporization efficiency is improved, but device complexity increases

Engineering Contradiction:
Improvevaporization efficiencyVSAvoiddevice complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent applies universality by using the intermediate layer to serve multiple functions: it acts as a barrier layer protecting the ink pattern, provides a surface for coating application, and contributes to thermal management. This multi-functionality enables efficient vaporization without proportionally increasing device complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses composite materials by combining the coating layer with the intermediate layer and paper substrate. The coating layer containing flavor materials and low melting point compounds works synergistically with the underlying layers to achieve efficient vaporization, while the integrated composite structure minimizes overall device complexity.

Inventive Principle:
Principle #40Composite materials

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 solution provides enhanced heat resistance and efficient vaporization/atomization of inhalation components, preventing substrate degradation and maintaining the integrity of the electrically conductive ink pattern, thus ensuring safe and effective operation of non-combustion flavor inhalers.

Implementation Method 1

a percentage weight loss of the paper from room temperature to 290° C. is less than 20% of a percentage weight loss of the paper from room temperature to 900° C.

Methodology Applied
Scientific EffectThermal degradation resistance:

Implementation Method 2

an electrically conductive ink pattern printed on the substrate

Methodology Applied
Scientific EffectPrinting deposition: Deposition (physical)

Implementation Method 3

a circuit board that includes an electric conductor printed on an electrically insulating substrate... a heater for vaporizing or atomizing flavor sources and/or aerosol sources

Methodology Applied
Scientific EffectJoule heating: Joule Heating

Implementation Method 4

the coating layer contains a material having a melting point or sol-gel transition temperature of 290° C. or lower and a flavor added into the material

Methodology Applied
Scientific EffectMelting: Melting

Implementation Method 5

a liquid inhalation component source to be vaporized or atomized by application of energy

Methodology Applied
Scientific EffectVaporization: Evaporation

Data Source

PatentUS11690402B2Circuit board for non-combustion type flavor inhaler and non-combustion type flavor inhaler
Publication Date: 2023.07.04 JAPAN TOBACCO INC
  • US11690402B2 patent drawing
  • US11690402B2 patent drawing
  • US11690402B2 patent drawing

AI summary

A circuit board for a non-combustion flavor inhaler includes a substrate and an electrically conductive ink pattern printed on the substrate. The substrate includes paper. A percentage weight loss of the paper from room temperature to 290° C. is less than 20% of a percentage weight loss of the paper from room temperature to 900° C. under a condition that allows air to flow at a flow rate of 100 mL/min while elevating a temperature of the air at a speed of 10° C./min.