Compostable Biopolymer Injection Molded Part Surface Structure
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Solution Overview
Problem
Conventional plastics are non-degradable and pose environmental concerns, necessitating the development of compostable alternatives for injection molded parts, particularly in packaging and containers, to improve environmental balance.
Innovation Solution
Production of compostable injection molded parts using thermoplastic materials containing biopolymers, enhanced with a surface-enlarging structure through injection molding, which accelerates mechanical disintegration and composting, utilizing bioplastics compounded with natural fibers like wood, and an injection molding tool with structured surfaces to simplify and enhance production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional plastics are used for injection molded parts, then manufacturing ease and cost-effectiveness are maintained, but environmental impact worsens due to non-biodegradability
Solution Approach 1:
The patent uses composite materials consisting of biopolymers combined with natural fibers (wood, plant fibers, or cellulose) to create injection-molded parts that are both compostable and manufacturable. This composite approach allows the material to maintain processability while adding biodegradability, resolving the contradiction between environmental impact and manufacturing ease.
2Object-affected harmful factors
If biopolymer materials are used for compostable parts, then environmental footprint is improved, but production complexity increases
Solution Approach 1:
The patent merges the compostability function with the injection molding process by integrating surface structures directly into the mold cavity. This allows the part to be molded with enhanced composting surfaces in the same production step, eliminating separate post-processing operations and reducing overall production complexity despite using biopolymer materials.
3Stability of the object's composition
If surface area is increased to accelerate disintegration, then compostability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-forming the surface-enhancing structures directly during the injection molding process. The mold cavity is designed with the desired surface pattern (such as ribs, channels, or textured surfaces) that is transferred to the part during molding, eliminating the need for post-molding surface modification and reducing manufacturing precision requirements for subsequent 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
The solution results in improved compostability and environmental balance by accelerating the disintegration and composting process of injection molded parts, while maintaining cost-effectiveness and ease of production, thus addressing the environmental impact of conventional plastics.
Implementation Method 1
The injection-molded part is provided with a structure in at least one section, such that the structure in the associated section increases the surface area of the injection-molded part... the structure increases the surface area of the injection-molded part, leading to accelerated mechanical disintegration
Data Source
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AI summary
The present invention relates to a method for producing a compostable injection-molded part (1) from a material comprising at least biopolymers. An improved environmental footprint with simplified production is achieved by providing an outer surface (2) of the injection-molded part (1) in at least one injection-molded part section (3) with an injection-molded part structure (4) that increases the surface area. The invention further relates to the use of an injection mold (13) for producing such an injection-molded part (1), such an injection-molded part (1) produced as a packaging part (18), in particular as a closure (5), and a container (20) with such a closure (5).