Biodegradable Wrapping Net With Differential Yarn Strength
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Solution Overview
Problem
The existing wrapping nets and films used in agriculture and livestock industries, primarily made of synthetic resins like polyethylene, pose difficulties in removal and disposal, leading to accidents and contamination issues when used as feed or fermentation materials for bioethanol production, due to their high tension and non-biodegradability.
Innovation Solution
A wrapping net comprising cellulose-based fibers, where the warp yarns have greater strength than the weft, allowing for easier removal and biodegradability, is developed, using yarns like cotton or biodegradable resins, which can be digested by livestock and decomposed like hay or straw, reducing operational hazards and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wrapping net made of synthetic resin (polyethylene) with high tensile strength is used, then the strength and structural integrity of the roll bale is improved, but the removal difficulty and operational hazard increase
Solution Approach 1:
The wrapping net is segmented into warp yarns and weft yarns with different material properties. The warp yarns use biodegradable materials (cellulose, starch, protein fibers) while the weft yarns maintain structural integrity. This segmentation allows the net to be easily removed by cutting only the weft direction, solving the removal difficulty while maintaining overall strength.
Solution Approach 2:
Different regions of the wrapping net have different material compositions. The warp direction uses biodegradable, easy-to-remove materials, while the weft direction uses stronger materials for structural support. This local differentiation of material properties resolves the contradiction between ease of removal and structural strength.
2Stability of the object's composition
If a wrapping net made of synthetic resin is used, then the structural stability of the roll bale is improved, but the environmental harm and disposal cost increase
Solution Approach 1:
The wrapping net uses composite materials combining biodegradable fibers (cellulose, starch, protein) with synthetic resin. The biodegradable components provide structural stability while being environmentally friendly, and can be digested by livestock or decomposed in the environment, eliminating environmental harm while maintaining structural integrity.
Solution Approach 2:
The material composition parameter is changed from pure synthetic resin to a mixture of biodegradable materials and synthetic resin. This parameter change maintains the structural stability needed for roll bale integrity while introducing biodegradability to eliminate environmental harm and disposal costs.
3Productivity
If a wrapping net with high tensile strength is used, then the conveying and storage efficiency is improved, but the removal time and labor cost increase
Solution Approach 1:
The wrapping net is segmented into warp and weft directions with different removal characteristics. The weft yarns are designed to be easily cut and removed, while the warp yarns maintain structural integrity during conveying and storage. This segmentation enables rapid removal by cutting only in the weft direction, reducing removal time while maintaining conveying efficiency.
Solution Approach 2:
Different directions of the wrapping net have different material properties optimized for different functions. The warp direction uses materials optimized for structural stability during conveying, while the weft direction uses materials optimized for easy removal. This local quality differentiation resolves the contradiction between conveying efficiency and removal speed.
Data Source
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AI summary
This is to provide a wrapping net which maintains the merits by wrapping with a wrapping net effective for conveying and storage, and, in which a removal operation of the wrapping net is easy, even when a residue of the wrapping net is migrated into a feed or a fermentation raw material, an effect on the livestock is a little or no trouble is caused in a fermentation apparatus. It comprises warp yarn groups aligned in parallel in a lengthwise direction of a knitted fabric form a plural number of independent chain stitches by continuous loops in the lengthwise direction thereof, respectively, and each loop of the independent chain stitches is connected to other loops of other independent chain stitches by weft to form a knitted fabric. In the knitted fabric, characteristic feature resides in that at least the weft comprises a cellulose-based fiber, and yarn strength of the warp is greater than yarn strength of the weft.