Paperboard Powder Container With Separable Closure for Recycling
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Solution Overview
Problem
Existing packaging materials for powdered products, such as infant nutrition, pose challenges for recycling due to the combination of materials like paperboard, metal foil, and plastic, which are difficult to separate and sort effectively.
Innovation Solution
A package design featuring a paperboard laminate with a heat-sealable polymer innermost layer, an oxygen barrier layer, and a detectable outermost layer identifiable by near-infrared radiation, along with a plastic closure that can be separated from the container using a designated separation region, facilitating recycling by allowing the container to be sorted into separate streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a package is constructed with multiple materials (paperboard, metal foil, plastic) to achieve barrier properties and durability, then the package provides effective protection and long-term storage, but the package becomes difficult to recycle due to material contamination
Solution Approach 1:
The package is divided into separable components: a paperboard container body and a plastic closure. The separation region with reduced bond strength allows easy detachment of the closure from the container, enabling each component to be recycled through appropriate streams without contamination from the other material type.
2Reliability
If a plastic closure is tightly adhered to the container for durability and insect-tightness, then the package maintains structural integrity and protection, but the closure cannot be easily separated for recycling purposes
Solution Approach 1:
The bond strength between the closure and container is made non-uniform: the separation region has reduced bond strength compared to other attachment regions. This allows the closure to remain tightly attached during normal use for protection and durability, while enabling easy separation at the designated region for recycling purposes.
3Reliability
If existing packages are constructed with strong adhesive bonding between closure and container, then the package provides effective sealing and protection, but the components cannot be separated without tools for recycling
Solution Approach 1:
The bonding interface is segmented into multiple regions with different bond strengths. The separation region provides a predetermined weak bond that allows manual separation without tools, while other regions maintain strong bonding for effective sealing and protection during normal use.
4Productivity
If a detection layer is added to the paperboard laminate to enable NIR identification for recycling sorting, then the package can be efficiently sorted into recycle streams, but the package structure becomes more complex
Solution Approach 1:
The outermost layer of the paperboard laminate serves multiple functions: it provides the detection capability for NIR identification to enable efficient recycling sorting, while also serving as a protective and structural layer of the package. This multi-functionality reduces the need for additional separate components.
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 design enables efficient recycling by allowing the plastic closure to be separated from the paperboard container, improving the sorting process and reducing contamination in recycling streams.
Implementation Method 1
The laminate sheet comprises at least an innermost layer of heat-sealable polymer, an oxygen barrier layer and a core layer of paperboard and includes an outermost detection layer that is identifiable by near infrared radiation
Implementation Method 2
The sidewall of tubular shape having an upper end and a lower end, made from a sheet of paperboard laminate... The laminate sheet has opposed edges brought together and butt-jointed at a vertical seam and comprises at least an innermost layer of heat-sealable polymer
Data Source
Figure 1
Figure 2~2A
Figure 3
AI summary
A package for a powdered nutritional product. The package includes a sidewall of tubular shape having an upper end and a lower end, made from a sheet of paperboard laminate. The laminate sheet has opposed edges brought together and butt-jointed at a vertical seam and comprises at least an innermost layer of heat-sealable polymer, an oxygen barrier layer and a core layer of paperboard, the sidewall further comprising an outermost detection layer. A base is joined to and closes the lower end of the sidewall to form a container defining a product containing space in which a quantity of the powdered nutritional product is located. The product containing space is hermetically closed prior to use by a membrane seal which is at least partially removable to gain access to the product. The package also includes a closure. The closure has a circumferential rim connected to the upper end of the sidewall defining an access opening and a lid, pivotably attached to the rim, for selectively closing the access opening.