Removable-End Paperboard Container for Easier Component Recycling

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Solution Overview

Problem

Existing composite containers with removable ends face limitations in recyclability due to the need for manual separation of metal or plastic end closures from the paperboard container, increasing costs and complexity in recycling processes.

Innovation Solution

A container design featuring a score line near the removable end, allowing easy separation of the paperboard container from the metal or plastic end closure, facilitated by a circumferential perforation or cut line that does not penetrate the entire thickness of the sidewall, enabling separate recycling of components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a permanently adhered metal or plastic end closure is used in a paperboard container, then the container provides permanent sealing and structural integrity, but the recyclability is limited and manual separation is required

Engineering Contradiction:
Improvesealing integrityVSAvoidrecyclability
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The container is divided into separable components: a paperboard container body and a removable end closure (metal or plastic). The end closure can be detached from the container body through a tearing action at score lines, allowing each component to be recycled separately. This segmentation resolves the contradiction by maintaining sealing integrity during use while enabling easy separation for recycling.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Score lines are pre-formed in the container body at locations near the end closure before the container is sealed and used. These score lines create predetermined weak points that guide the separation process. When the consumer needs to separate the components for recycling, they simply tear along the pre-formed score lines, making the separation process simple and intuitive without requiring complex tools or procedures.

Inventive Principle:
Principle #10Preliminary action

2Ease of repair

If manual separation of metal or plastic end from paperboard container is required, then component recycling is possible, but the recycling process becomes costly and complex

Engineering Contradiction:
Improvecomponent separationVSAvoidrecycling process complexity
Core Design Contradiction:
Ease of repairVSDevice complexity

Solution Approach 1:

The container is designed as a segmented structure with a removable end closure that can be easily detached from the container body. This segmentation allows consumers to separate components at home without requiring complex equipment or procedures, thereby reducing the complexity and cost of the overall recycling process while still enabling component recycling.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The container design enables consumers to perform the separation task themselves through simple tearing actions at pre-formed score lines. This self-service capability eliminates the need for complex automated separation systems at recycling facilities, reducing operational complexity and costs while maintaining the ability to recycle components effectively.

Inventive Principle:
Principle #25Self-service

3Ease of manufacture

If the container body is made of single-ply paperboard material, then manufacturing is simple and cost-effective, but structural strength may be insufficient for certain applications

Engineering Contradiction:
Improvemanufacturing simplicityVSAvoidcontainer strength
Core Design Contradiction:
Ease of manufactureVSStrength

Solution Approach 1:

The container body is constructed from composite materials, specifically multiple plies of paperboard material bonded together. This composite structure provides enhanced structural strength and rigidity compared to single-ply paperboard, while still maintaining the simplicity of paperboard-based manufacturing processes. The multi-ply construction allows the container to withstand higher stresses and maintain its shape during handling and transport.

Inventive Principle:
Principle #40Composite materials

Data Source

PatentUS12466604B2Container with removable end
Publication Date: 2025.11.11 SONOCO DEVELOPMENT INC
  • US12466604B2 patent drawing
  • US12466604B2 patent drawing
  • US12466604B2 patent drawing

AI summary

The invention comprises a container comprising: a base; at least one paper-based sidewall seamed to and extending upwardly from the base, wherein the at least one sidewall comprises a score line near the base that is at least partially circumferential and is configured to be torn through to remove the base from the sidewall; and a liner ply adhered to an interior surface of the sidewall.