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首页> 外文期刊>Packaging Technology and Science >Influence of the length of the internal sleeve valve on the release of powdery substances from the closures of valved bags for dangerous goods
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Influence of the length of the internal sleeve valve on the release of powdery substances from the closures of valved bags for dangerous goods

机译：内套筒阀的长度对危险物品的带阀袋盖中粉状物质释放的影响

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摘要

In practice, checks on dangerous goods transports often detect leaks of powdered dangerous goods from valved bags. In this work, the influence factors of a sudden release of powdery substances from the valves of valved bags were investigated. Drop tests were performed on paper bags of UN design type 5M2 with internal sleeve valve using 2 different powdery substances (Esplas H130 and zinc oxide Rotsiegel). The internal sleeve valves of all test samples were not sift-proof with respect to both filling substances. For almost all test samples, the Esplas H130 powder already leaked out of pasted joints during manual filling. This is a contradiction to the requirement in UN 6.1.4.18.1, according to which closures and joints of paper bags 5M2 should be sift-proof. In the drop tests, longer valve lengths had a greater sealing effect for both filling substances (for filling degrees of at least 95% and for test samples which had already been mechanically loaded). As an extreme example, at the drop height of 1.20m and a filling degree of 100%, the released amount of zinc oxide powder from a 10-cm-long valve was about 16 times higher than from a valve length of 12.5cm. The valve length is therefore a safety-relevant parameter and should be specified by the manufacturer. To ensure that only filling goods with similar physical properties in comparison with the test substance are used for valved bags, the user must be informed of the particle size of the test substance.
机译：在实践中，对危险品运输的检查通常会发现带阀袋中粉末状危险品的泄漏。在这项工作中，研究了粉状物质从带阀袋的阀中突然释放的影响因素。使用2种不同的粉状物质（Esplas H130和氧化锌Rotsiegel）在带有内部套筒阀的UN设计类型5M2纸袋上进行跌落测试。对于所有填充物，所有测试样品的内套筒阀都不是防筛漏的。对于几乎所有测试样品，Esplas H130粉末在手动填充过程中已经从粘贴的接头处漏出。这与联合国6.1.4.18.1的要求相抵触，根据该要求，纸袋5M2的封口和接头应防漏。在跌落测试中，较长的阀门长度对两种填充物都具有更大的密封效果（填充度至少为95％以及已经机械加载的测试样品）。举一个极端的例子，在下落高度为1.20m，填充度为100％时，从10厘米长的阀门释放的氧化锌粉末的量是从12.5厘米阀门释放的释放量的约16倍。因此，阀长度是安全相关的参数，应由制造商指定。为了确保仅将带气袋的填充物与测试物质相比具有相似的物理特性，必须告知用户测试物质的粒径。

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