Paper-Resin Packaging Bag Flexibility and Seal Integrity

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Solution Overview

Problem

Paper-made packaging bags for sheet rolls are not flexible enough, leading to breakage or peeling of seals during manufacturing or transportation, which deteriorates packaging properties.

Innovation Solution

A packaging bag with a three-layer structure, comprising a paper layer with a paper component and resin layers with thermoplastic resin on both surfaces, where the paper component constitutes 45% or more of the bag.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the packaging bag is made of paper to reduce environmental burden, then environmental friendliness is improved, but flexibility deteriorates causing breakage or seal peeling

Engineering Contradiction:

Improveenvironmental burdenVSAvoidflexibility

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The packaging bag uses a composite structure with a paper layer as the base and thermoplastic resin layers on both surfaces. This composite material approach combines the environmental benefits of paper with the flexibility and durability provided by thermoplastic resin, resolving the contradiction between environmental friendliness and flexibility.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent specifies that the paper component proportion must be 45% or more to maintain environmental benefits while achieving adequate flexibility. By controlling this parameter, the invention balances environmental considerations with mechanical performance requirements.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the paper component proportion is increased to maintain environmental benefits, then environmental friendliness is improved, but flexibility deteriorates

Engineering Contradiction:

Improveenvironmental burdenVSAvoidflexibility

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent establishes a specific parameter range (45% or more paper component) that balances environmental benefits with adequate flexibility. This parameter control allows the packaging bag to maintain paper-based environmental advantages while incorporating sufficient resin content to ensure proper flexibility and prevent breakage.

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 solution enhances the flexibility and durability of the packaging bag, preventing breakage and seal peeling, while maintaining the environmental benefits of a paper-based material.

Implementation Method 1

a resin layer including a thermoplastic resin provided on both surfaces of the paper layer

Methodology Applied

Scientific EffectThermoplastic resin properties:

Data Source

PatentUS12275568B2Packaging bag, method of manufacturing packaging bag, and sheet package

Publication Date: 2025.04.15 DAIO PAPER CORP

AI summary

A packaging bag configured to pack a sheet in a folded-packaged manner includes a paper layer including a paper component, and a resin layer including a thermoplastic resin provided on both surfaces of the paper layer, wherein a proportion of the paper component in the packaging bag is 45% or more.