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The effect of flexible sealing jaws on the tightness of pouches made from mono‐polyolefin films and functional papers
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2021-01-06 , DOI: 10.1002/pts.2552 Marek Hauptmann 1 , Willi Bär 1 , Ludwig Schmidtchen 1 , Norbert Bunk 2 , Daniel Abegglen 3 , Alexey Vishtal 3 , Yves Wyser 3
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2021-01-06 , DOI: 10.1002/pts.2552 Marek Hauptmann 1 , Willi Bär 1 , Ludwig Schmidtchen 1 , Norbert Bunk 2 , Daniel Abegglen 3 , Alexey Vishtal 3 , Yves Wyser 3
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Flexible packaging materials consisting of several layers of very dissimilar materials are currently considered for replacement by multilayer polyolefin films as well as functional flexible paper materials to improve recyclability. Such materials however lead to new challenges in processing on existing packaging machinery. This paper focuses on the sealing process of such materials, especially looking at pillow pouches and the challenges occurring at the junction between cross and fin seals where the total thickness jumps from two to four layers. It is shown that the application of conventional machinery and sealing tools does not lead to a gastight seal within the operational sealing window of such materials. The origin of the permanent failure is the lack of material fraction capable to flow as a viscous melt into the gap at the fin seal. The limited compressibility of the nonmelting materials and their bending stiffness tend to increase the gap. In case of paper, a flexible sealing jaw, equipped with an elastic insert, enables a focused application of pressure at the layer jump of a poorly compressible material. This results in clearly improved gas tightness of all selected materials in the range of the used test methods (leak size 10 μm). The leakage rate of papers was reduced from 3–4 mbar·l/s with rigid tools to 1 mbar·l/s with flexible tools. The leakage of 2 mbar·l/s with OPP/CPP material could be prevented and no leaks were detected. With OPP/PE, leak‐proof results were obtain within reduced temperature at 140°, which is near the level of acceptable seal quality with low shrinkage effect.
中文翻译：
柔性密封钳口对单聚烯烃薄膜和功能纸制成的袋的紧密度的影响
目前考虑由几层非常不同的材料组成的柔性包装材料，以多层聚烯烃薄膜和功能性柔性纸材料代替，以提高可回收性。然而，这种材料在现有包装机械上的加工中带来了新的挑战。本文着重于此类材料的密封过程，特别是研究枕形袋以及在交叉密封和翅形密封之间的接合处发生的挑战，其中总厚度从两层跃升至四层。已表明，常规机械和密封工具的应用不会在这种材料的工作密封窗口内导致气密密封。永久性故障的根源是缺乏能够作为粘性熔体流入翅片密封处间隙的材料部分。非熔融材料的有限可压缩性及其抗弯刚度往往会增加间隙。对于纸张，配备有弹性插件的柔性密封钳口可将压力集中施加在可压缩性较差的材料的层跳处。这样可以在使用的测试方法范围内（泄漏尺寸10μm）明显改善所有选定材料的气密性。纸张的泄漏率从使用刚性工具的3-4 mbar·l / s降低到使用柔性工具的1 mbar·l / s。可以防止OPP / CPP材料泄漏2 mbar·l / s，并且没有发现泄漏。使用OPP / PE，可在140°C的降低温度下获得防漏结果，该温度接近可接受的密封质量，且收缩率低。
更新日期：2021-01-29
中文翻译：
柔性密封钳口对单聚烯烃薄膜和功能纸制成的袋的紧密度的影响
目前考虑由几层非常不同的材料组成的柔性包装材料，以多层聚烯烃薄膜和功能性柔性纸材料代替，以提高可回收性。然而，这种材料在现有包装机械上的加工中带来了新的挑战。本文着重于此类材料的密封过程，特别是研究枕形袋以及在交叉密封和翅形密封之间的接合处发生的挑战，其中总厚度从两层跃升至四层。已表明，常规机械和密封工具的应用不会在这种材料的工作密封窗口内导致气密密封。永久性故障的根源是缺乏能够作为粘性熔体流入翅片密封处间隙的材料部分。非熔融材料的有限可压缩性及其抗弯刚度往往会增加间隙。对于纸张，配备有弹性插件的柔性密封钳口可将压力集中施加在可压缩性较差的材料的层跳处。这样可以在使用的测试方法范围内（泄漏尺寸10μm）明显改善所有选定材料的气密性。纸张的泄漏率从使用刚性工具的3-4 mbar·l / s降低到使用柔性工具的1 mbar·l / s。可以防止OPP / CPP材料泄漏2 mbar·l / s，并且没有发现泄漏。使用OPP / PE，可在140°C的降低温度下获得防漏结果，该温度接近可接受的密封质量，且收缩率低。
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