Plastic Bag Resin Blends for Mixed Recycled Bottle Feedstock
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Solution Overview
Problem
Existing methods face challenges in producing plastic bags from recycled plastic bottles due to technical prejudices, incompatibility of mixed recycled plastics, and regulatory barriers, particularly for food contact applications, leading to low quality and high costs.
Innovation Solution
A method involving a mixture of recycled plastic bottle resin, virgin resin, recycled filler, and additives to form plastic bags, with specific proportions and types tailored for food or non-food contact applications, ensuring compatibility and regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If closed-stream bottle-to-bottle recycling is used, then purity and quality of recycled plastic are improved, but versatility of recycled plastic applications is limited
Solution Approach 1:
The patent changes the physical and chemical parameters of recycled plastic by blending different types and colors of recycled plastic bottles together. This allows the recycled plastic to be adapted for multiple applications including plastic bags, toys, and furniture, while maintaining acceptable quality standards through proper formulation and processing parameters.
Solution Approach 2:
The patent creates composite materials by combining different types of recycled plastic resins (PET, HDPE, LDPE, PP) in various proportions. This composite approach enables the recycled plastic to achieve the necessary mechanical properties for diverse applications while utilizing mixed-color inputs that would otherwise be rejected in closed-stream recycling.
2Adaptability or versatility
If mixed colour recycled plastic resin is used, then versatility of recycled plastic applications is improved, but quality and cleanliness of recycled plastic deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the blending ratios of different recycled plastic types and colors, adding compatibilizers to improve compatibility, and modifying processing parameters during extrusion and molding to achieve acceptable quality outcomes from mixed-color inputs.
Solution Approach 2:
The patent uses compatibilizer additives as intermediary substances to facilitate the mixing of chemically incompatible recycled plastics. These compatibilizers act as mediators that improve the interfacial adhesion between different plastic types, preventing phase separation and maintaining structural integrity in the final product.
3Adaptability or versatility
If compatibilizer additives are used to enable incompatible plastics to be recycled together, then versatility of recycled plastic applications is improved, but device complexity and cost increase
Solution Approach 1:
The patent optimizes the concentration and type of compatibilizer additives to achieve the minimum necessary level for successful blending. By carefully controlling the dosage and selection of compatibilizers, the process maintains simplicity while enabling the recycling of mixed plastic types for various applications.
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
Produces high-quality plastic bags with desired functional properties and up to 100% recycled content, overcoming technical obstacles and reducing costs.
Implementation Method 1
preparing a mixture comprising about 0.1% to 100% by weight of recycled plastic bottle resin
Implementation Method 2
plastic bags are generally made by extrusion
Implementation Method 3
forming the mixture into a plastic bag
Data Source
AI summary
A method of making plastic bags, comprising preparing a mixture comprising about 0.1% to 100% by weight of recycled plastic bottle resin, and forming the mixture into a plastic bag.