Compression Molding for High-Strength Packaging
2 patents in this list
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Compression molding of fiber-based packaging materials presents unique challenges in achieving strength and moisture resistance. Current processes achieve compression ratios of 2.5:1 to 3:1, but material failures occur when pushing beyond these limits, particularly at corners and transition zones. The interplay between fiber length, resin distribution, and molding parameters directly affects both structural integrity and barrier properties.
The fundamental challenge lies in optimizing the distribution of binding agents and structural fibers while maintaining moldability and preventing material separation during compression.
This page brings together solutions from recent research—including surface-concentrated thermoplastic distribution techniques, two-stage molding processes for long-fiber materials, and targeted compression strategies for critical zones. These and other approaches focus on achieving high-strength packaging while reducing overall material usage and environmental impact.
1. Manufacturing Method for Packaging Containers with Surface-Concentrated Thermoplastic Resin via Paper Molding
AMG CO LTD, 2022
Method for manufacturing packaging containers using paper molds to reduce environmental impact and improve moisture resistance. The technique involves optimizing the molding process parameters like temperature, compression ratio, and time to distribute a larger amount of thermoplastic resin on the surface of the container rather than uniformly. This prevents moisture absorption into the core. By using less resin overall, the technique reduces environmental load compared to uniform distribution. The surface resin concentration is achieved by compressing the molded product at higher ratio and shorter time than standard. This pushes resin to the surface and suppresses migration back. The technique allows lower resin content while still improving moisture resistance.
2. Manufacturing Method for Packaging Case Using Long Fiber Paper with Two-Stage Molding Process
SIN WOO CO LTD, Shinwoo Co., Ltd., 2020
A method for manufacturing a packaging case using paper that reduces environmental impact by avoiding plastics. The method involves molding long fiber paper to shape using a two-stage molding process. In the first stage, the outside rim is fixed. In the second stage, the inside is compressed to form the case. The long fiber paper prevents tearing during molding. The case is made by stacking and laminating discs cut from paper, molding the outside first, then the inside. The long fiber paper allows molding without bursting.
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