Scored Polyethylene Pouch Opening With Torn-Section Retention

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Solution Overview

Problem

Polyethylene films used in packaging are difficult to open predictably, often leading to over-tearing and loss of contents, which is a challenge for recyclable packaging solutions.

Innovation Solution

Incorporating a score line that partially penetrates the film adjacent the seal, allowing for controlled tearing along a predictable path, ensuring a clean and easy opening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If polyethylene film is used for packaging, then recyclability is improved, but ease of opening deteriorates due to stretching behavior under load

Engineering Contradiction:

ImproverecyclabilityVSAvoidease of opening

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

A score line is pre-formed in the polyethylene film pouch at a predetermined location, creating a weakened path that guides the tearing process. This preliminary structural modification enables controlled opening without requiring the user to apply excessive force or perform complex opening maneuvers, thus resolving the contradiction between using recyclable polyethylene material and maintaining ease of opening.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If tearing is initiated from a starter cut at the top of the pouch, then ease of opening is improved, but control of tear progression deteriorates leading to over-tearing and loss of contents

Engineering Contradiction:

Improveease of openingVSAvoidcontrol of tear progression

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The score line is pre-formed at a specific distance (0.25-2.0 inches) from the sealed end of the pouch, establishing a predetermined tear path before use. This preliminary action ensures that when the user initiates tearing, the tear follows the score line in a controlled manner, preventing uncontrolled propagation and over-tearing while maintaining ease of opening.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The score line creates a localized region of reduced strength in the film structure, concentrating the tearing action along a specific path rather than allowing random tear propagation. This local modification of material properties ensures controlled tearing behavior while maintaining the integrity of the rest of the pouch structure.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12570452B2Easy-open pouch with score line and retention of torn section

Publication Date: 2026.03.10 GP&C OPERATIONS LLC

AI summary

A sealed package includes first and second opposed plies, each with first and second edges, wherein the first edges of the first and second plies have overlying sections that form a first seal, and wherein the second edges of the first and second plies have overlying sections that form a second seal; the first and second plies include polymeric film. A score line is present adjacent the second seal, the score line only partially penetrating the first ply and extending less than a full width of the first ply.