Ethyl Cellulose Inner Liner Coating for Stain-Free Tobacco Packs

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Solution Overview

Problem

Conventional containers for tobacco articles, particularly those made of sustainable materials, fail to prevent staining from oily substances in filters, leading to a poor appearance and potential sticking of the articles to the inner liner.

Innovation Solution

A container with an inner liner coated with an anti-staining layer comprising ethyl cellulose to prevent staining, ensuring non-stick properties and maintaining the container's appearance, which is applied using rotogravure or flexographic printing technology.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If sustainable material filters (paper-based) are used without additional chemical substances, then recyclability is improved, but staining on the inner liner occurs due to oily substances

Engineering Contradiction:

ImproverecyclabilityVSAvoidstaining

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

An anti-staining coating layer is introduced as an intermediary between the oily filters and the inner liner. This coating prevents direct contact between the oily substances from sustainable filters and the inner liner surface, thereby preventing staining while maintaining the recyclability benefits of paper-based filters.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The anti-staining coating is applied in advance to the inner liner before the filters are placed inside the container. This preliminary protective action ensures that when oily substances are present, they cannot stain the inner liner, thus preventing the harmful effect before it occurs.

Inventive Principle:

Principle #9Preliminary anti-action

2Adaptability or versatility

If conventional acetate filters are replaced by paper filters, then environmental sustainability is improved, but harsh smoke is generated due to lack of oily chemical substances

Engineering Contradiction:

ImprovesustainabilityVSAvoidharsh smoke

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Oily chemical substances are added to the paper-based filters to modify their properties. This parameter change allows the sustainable paper filters to deliver a smoother smoke experience by providing the necessary chemical substances that were previously only available in acetate filters.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If inner liner is made of conventional material, then manufacturing simplicity is maintained, but sticking of tobacco articles occurs due to heat seal capabilities

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidsticking

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The anti-staining coating acts as an intermediary layer between the tobacco articles and the inner liner. This coating prevents direct adhesion between the tobacco articles and the inner liner surface, eliminating the sticking problem while allowing the inner liner to remain made of conventional simple materials.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Object-affected harmful factors

If ethyl cellulose coating is applied on inner liner, then anti-staining performance is improved, but coating complexity increases

Engineering Contradiction:

Improvestain preventionVSAvoidcoating complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The properties of ethyl cellulose are optimized to achieve the desired anti-staining performance. By carefully selecting the molecular weight, substitution degree, and coating thickness parameters of the ethyl cellulose, effective stain prevention is achieved while managing the coating process complexity.

Inventive Principle:

Principle #35Parameter changes

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 anti-staining coating effectively prevents oily stains and sticking, preserving the container's appearance and facilitating easy recycling of sustainable filters.

Implementation Method 1

an anti-staining coating comprising a first anti-staining layer comprising ethyl cellulose to prevent or minimise staining from oily chemical substances

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

As it forms a very thin layer, the frictional heat of the embossing roller is sufficient to prevent cracking and promotes the forming

Methodology Applied

Scientific EffectFrictional heating: Viscous Heating

Implementation Method 3

the melting point of the ethyl cellulose is generally comprised between 240 and 255° C. which is above the temperatures applied during the packing manufacturing

Methodology Applied

Scientific EffectThermal stability:

Data Source

PatentUS20260035162A1Container for tobacco articles, and associated pack of tobacco articles and manufacturing method

Publication Date: 2026.02.05 JT INTERNATIONAL SA

AI summary

An embodiment concerns a container for tobacco articles, each tobacco article comprising a filter;the container comprising:an outer box;an inner liner inserted in the outer box and configured to receive tobacco articles, the inner liner defining an internal surface designed to be in contact with the tobacco articles and an external surface in contact with the outer box;wherein at least one surface of the inner liner is coated with an anti-staining coating comprising a first anti-staining layer comprising ethyl cellulose to prevent or minimize staining from oily chemical substances contained in the filters of the tobacco articles.