Moulded Pulp Container with Removable Barrier Membrane
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Solution Overview
Problem
Moulded pulp containers for heated food face challenges in withstanding high temperatures and separating recyclable pulp from plastic linings, leading to difficulties in recycling due to the absorbent properties of pulp and the need for plastic coatings that are not environmentally friendly.
Innovation Solution
A moulded pulp food container with a removable plastic barrier membrane featuring a tab portion that allows easy separation from the pulp container, enabling separate recycling streams for pulp and plastic, and a tear seam for mechanical detachment without damaging the membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic coating or liner is provided on the pulp container to waterproof the inner surface, then the container can withstand high temperatures and prevent liquid saturation, but the plastic and pulp cannot be easily separated for recycling
Solution Approach 1:
The container is divided into separable components: a pulp container body and a removable plastic barrier membrane. The membrane can be detached from the container body, allowing the plastic to be separated for recycling independently from the pulp container, thus resolving the recycling difficulty while maintaining waterproofing functionality during use.
Solution Approach 2:
The plastic barrier membrane is positioned within and conforms to the inner surface of the pulp container body, creating a nested structure where the membrane is contained within the container during use but can be removed for separate recycling processing.
2Reliability
If a plastic lining is used to protect the pulp from liquid saturation, then the container can contain food without leakage, but the plastic occupies significant weight proportion making removal impossible with conventional equipment
Solution Approach 1:
A thin plastic barrier membrane is used instead of a thick plastic lining or coating. This membrane provides sufficient waterproofing and leakage prevention while occupying minimal weight proportion, enabling easy manual removal and separation from the container body without requiring industrial-scale equipment.
3Stability of the object's composition
If the barrier membrane is bonded to the inner surface of the container, then the membrane remains in place during use, but the membrane cannot be easily removed for separate recycling
Solution Approach 1:
The bonding arrangement is designed to allow segmentation into two parts: the membrane remains stably bonded to the container body during normal use and handling, but can be deliberately detached when needed for recycling, providing both stability during operation and ease of removal for end-of-life processing.
4Stability of the object's composition
If the tab portion is located within the boundary region with the lidding film, then the tab is protected during lidding removal, but the tab cannot be easily gripped for peeling the barrier membrane
Solution Approach 1:
The tab portion extends outwardly from the container body in a direction perpendicular to the plane of the container opening, positioning it in a different spatial dimension. This outward extension makes the tab easily accessible for gripping while the tab's attachment to the container body maintains its integrity and prevents delamination during lidding removal operations.
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
Facilitates easier recycling of pulp containers by allowing the plastic membrane to be peeled away without requiring its removal during processing, maintaining the integrity of the membrane and ensuring effective separation from the pulp material.
Implementation Method 1
A barrier membrane is bonded to the inner surface of the container
Data Source
AI summary
A moulded pulp container for food includes a main body formed from a moulded pulp material and a pulp tab portion. The main body includes a base, upstanding walls extending from the base, and an outer edge defining a container having an inner surface and an outer surface. The pulp tab portion is connected to and arranged outboard of the outer edge. The pulp tab portion has an upper surface and a lower surface. A barrier membrane laminated to the inner surface of the container and the upper surface of the pulp tab portion is removable when the pulp tab portion is detached from the main body, such that the barrier membrane remains bonded to both the main body and the pulp tab portion, which enables the barrier membrane to be peeled from the main body by pulling the pulp tab portion.