Compostable Paperboard Coating with Talc Filler
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Solution Overview
Problem
Poly(butylene succinate) and poly(butylene succinate-co-adipate) coatings on paperboard substrates face challenges in extrusion coating process stability and heat-sealability, particularly in achieving consistent application and effective heat-sealability.
Innovation Solution
Incorporating a filler, such as talc, into the polymer coating composition of poly(butylene succinate) and poly(butylene succinate-co-adipate) to improve extrudability and heat-sealability, by forming a coating layer on the paperboard substrate that includes a polymer and filler, which enhances the flow of polymer molecules and reduces viscosity, thereby facilitating easier application and improving heat-seal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If poly(butylene succinate) and poly(butylene succinate-co-adipate) are used as coating polymers on paperboard substrates, then biodegradability and compostability are improved, but extrusion coating process stability and heat-sealability deteriorate
Solution Approach 1:
The patent combines biopolymer (poly(butylene succinate) or poly(butylene succinate-co-adipate)) with conventional polymer (polyethylene or polypropylene) to form a composite coating composition. This composite approach allows the biopolymer to provide biodegradability while the conventional polymer contributes to process stability and heat-sealability, resolving the contradiction between environmental friendliness and manufacturing performance
Solution Approach 2:
The patent modifies the coating composition by adjusting the ratio of biopolymer to conventional polymer, as well as incorporating fillers and other additives. By changing these compositional parameters, the patent optimizes both the biodegradability and the extrusion coating process stability, achieving a balance between the two conflicting requirements
2Reliability
If poly(butylene succinate) and poly(butylene succinate-co-adipate) are used as coating polymers, then compostability is improved, but heat-sealability deteriorates
Solution Approach 1:
The composite coating composition combines biopolymer with conventional polymer that has good heat-sealability. The conventional polymer component compensates for the poor heat-sealability of the biopolymer, while maintaining the compostability benefit through the biopolymer content
Solution Approach 2:
The patent creates different functional zones within the coating layer through the composite structure. The biopolymer phase provides compostability, while the conventional polymer phase provides heat-sealability, allowing each material to perform its optimal function in its appropriate domain within the coating
3Ease of manufacture
If filler is added to the polymer coating composition, then extrudability is improved, but coating composition complexity increases
Solution Approach 1:
The patent uses filler particles as intermediary components that modify the rheological properties of the coating composition. The filler acts as a mediator that improves extrudability by reducing viscosity and preventing polymer chain entanglement, while the overall composition remains relatively simple with commonly available 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 addition of talc to the polymer coating significantly reduces edge weave and enhances heat-sealability, achieving improved extrusion processing and heat-seal performance, with increased fiber tear at various temperatures, indicating better heat-sealability and reduced material waste.
Implementation Method 1
Incorporating a filler, such as talc, into the polymer coating composition of poly(butylene succinate) and poly(butylene succinate-co-adipate) to improve extrudability and heat-sealability, by forming a coating layer on the paperboard substrate that includes a polymer and filler, which enhances the flow of polymer molecules and reduces viscosity
Implementation Method 2
Recently there is increasing interest in using biopolymers for the polymer coating in such packaging structure. Examples of biopolymers include poly(butylene succinate) and poly(butylene succinate-co-adipate). However, both poly(butylene succinate) and poly(butylene succinate-co-adipate) present challenges in the extrusion coating process stability and downstream converting particularly heat-sealability
Data Source
AI summary
A paperboard structure including a paperboard substrate having a first major side and a second major side opposed from the first major side, and a coating layer on the first major side, the coating layer includes a polymer and talc, wherein the polymer includes at least one of poly(butylene succinate) and poly(butylene succinate-co-adipate).