目的 针对当前饮用水瓶盖普遍采用HDPE材料,与PET瓶身材质异质化造成回收分选困难、循环利用率偏低等痛点,研究适配PET瓶体的一体化瓶盖结构方案,助力饮用水包装向全PET同材质化转型,响应包装循环再生的发展需求。方法 对比分析PET与HDPE两种材料性能差异,梳理PET材料在瓶盖制造上的技术瓶颈;围绕螺纹结构、密封过盈配合、防盗环“装配抗断、开启脆断”的双向性能调控三大核心模块进行结构迭代优化设计。结果 经方案验证,采用防盗环与盖体一次注塑成型方式,配合密封与防拔结构设计,可有效改善PET材质脆性短板,降低断裂失效风险,提升密封可靠性,突破PET在饮用水瓶盖领域的应用技术难题。结论 通过结构创新,能够实现PET饮用水瓶盖的批量化生产。瓶与盖全PET同材具备材质纯净无混杂的优势,契合包装可回收性、单一材质组分的管控导向,可有效降低饮料包装回收处理成本,为同类饮品包装领域回收结构升级提供技术参考。
Abstract
Currently, most drinking water bottle caps are made of HDPE, while the bottle bodies are made of PET. This material mismatch creates difficulties in recycling sorting and leads to a low recycling rate. The work aims to develop an integrated cap structure that fully matches PET bottle bodies, to promote the transition of drinking water packaging to full-PET mono-material design, and meet the industry demand for packaging circularity. In this study, the property differences between PET and HDPE were compared to identify the technical bottlenecks of applying PET to bottle cap manufacturing. Then, iterative structural optimization was carried out on three core modules: thread structure, sealing interference fit, and the tamper-evident ring with dual performance requirements of breakage resistance during assembly and brittle fracture on opening.Validation results showed that the one-step injection molding process for the tamper-evident ring and cap body, combined with optimized sealing and anti-pull-off structures, effectively compensated for the inherent brittleness of PET. This design reduced fracture failure risk, improved sealing reliability, and solved the key technical barrier of applying PET in drinking water bottle caps. Through structural innovation, mass production of PET drinking water bottle caps can be realized. The full-PET mono-material design keeps the packaging free of mixed materials, complies with regulatory requirements for recyclable, single-component packaging, and effectively cuts down beverage packaging recycling costs. It also provides a technical reference for the recycling-oriented structural upgrade of similar beverage packaging products.
关键词
PET饮用水瓶盖 /
单一材质包装 /
瓶盖结构设计 /
防盗环 /
循环再生
Key words
PET drinking water bottle cap /
mono-material packaging /
bottle cap structural design /
tamper-evident ring /
recycling and regeneration
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