Paper Heat-Sealable Bag Coating for Curbside Recyclability
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Solution Overview
Problem
Current packaging bags made from plastic materials are not curbside recyclable and lack the capability to be heat sealable and recyclable in the paper recycling stream, as they often contain inner layers that cannot be recycled.
Innovation Solution
A paper-based packaging bag with a heat sealable, water soluble coating that allows for recycling in the paper recycling stream, featuring a heat sealable, water soluble coating applied to the inner surface, which can be wound into a master roll and used in various configurations, including pre-made chain and tube formats, with perforations for easy separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic materials such as polyethylene and polypropylene are used to make bags, then heat sealability is achieved, but curbside recyclability is lost
Solution Approach 1:
The patent uses a composite structure combining paper with a thin polyethylene liner layer. The paper provides recyclability and the polyethylene liner provides heat sealability, allowing the bag to achieve both properties simultaneously through material composition rather than single-material reliance
Solution Approach 2:
The patent modifies the recyclability parameter of plastic bags by reducing the polyethylene liner to extremely thin dimensions (less than 0.002 inches thick), changing its physical parameters to make it compatible with paper recycling streams while maintaining sufficient heat sealability functionality
2Adaptability or versatility
If paper bags with heat sealable properties are created, then curbside recyclability is maintained, but heat sealability capability is lost
Solution Approach 1:
The patent combines paper with a thin polyethylene liner to create a composite material that provides both heat sealability (from the polyethylene) and curbside recyclability (from the paper component), resolving the contradiction by integrating multiple material properties
Solution Approach 2:
The thin polyethylene liner serves multiple functions: it provides heat sealability, acts as a barrier layer, and maintains compatibility with paper recycling processes, enabling the bag to perform multiple functions simultaneously
3Reliability
If an inner sealant layer is added to paper bags, then heat sealability is achieved, but recyclability in paper stream is compromised
Solution Approach 1:
The patent changes the thickness parameter of the polyethylene liner to extremely thin dimensions (less than 0.002 inches), which modifies its recyclability characteristics to be compatible with paper streams while preserving heat sealability functionality
Solution Approach 2:
The patent uses an extremely thin polyethylene liner film that is thin enough to be accepted in paper recycling streams but thick enough to provide necessary heat sealability, leveraging the properties of thin film materials
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 bag provides both heat sealability and recyclability, allowing for efficient curbside recycling and enhanced packaging capabilities, including strength and pliability, while being suitable for food contact and protecting contents from moisture.
Implementation Method 1
The heat sealable, water soluble coating may be applied to the article of paper via a printing press
Implementation Method 2
Bags currently on the market do not work well because many do not have an inner sealant layer that is capable of being adequately recycled in the paper recycling stream
Implementation Method 3
a heat sealable, water soluble coating that allows for recycling in the paper recycling stream
Data Source
AI summary
The paper recyclable heat sealable bag includes a heat sealable water soluble inner layer coating and an article of paper. The heat sealable coating is applied to the article of paper by a printing press. As the printing press applies the heat sealable coating to the article of paper, the paper recyclable heat sealable bag may be wound into a master roll with a plurality of paper recyclable heat sealable bags. The master roll is fed into an automatic packaging system which fills the bags with a product from at least one of a top edge and a side edge of the paper recyclable heat sealable bags. The paper recyclable heat sealable bag has certain perforations to remove the paper recyclable heat sealable bag more easily from the master roll and sealed with a heat sealer.