Experimental elucidation on the mechanism of ultrasonic joining of thin polyethylene films using torsional vibrations
Experimental elucidation on the mechanism of ultrasonic joining of thin polyethylene films using torsional vibrations
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利用扭转振动对聚乙烯薄膜进行超声波连接机理的实验阐明
DOI：
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发表时间：
2021
影响因子：
1.5
通讯作者：
K. Mieda
中科院分区：
文献类型：
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作者：
K. Adachi;W. Ogasawara;K. Mieda
为了阐明超声波塑料连接的机理，我们进行了连接实验，使用扭转振动薄（0.1毫米）膜试样的三种类型的聚乙烯，即线性低密度聚乙烯（L-LDPE），低密度聚乙烯（LDPE）和高密度聚乙烯（HDPE）。从实验结果中，发现了以下重要事实：第一，通过电子束辐照对L-LDPE膜进行预处理显著地提高了膜试样的连接强度。其次，如果在普通连接条件下连接，不易处理的HDPE薄膜试样的连接强度大约是LDPE薄膜试样的4倍。因此，我们得出的结论是，超声波连接聚乙烯薄膜的机制应归因于在连接界面附近的非晶分子或分子链与其他的，如连接分子的连接片层结构在结晶区的缠结。
To clarify the mechanism of ultrasonic plastic joining, we have conducted the joining experiments using torsional vibrations for thin (0.1 mm) film specimens of three types of polyethylene viz. linear low-density polyethylene (L-LDPE), low-density polyethylene (LDPE) and high-density polyethylene (HDPE). From the experimental results, the following important facts have been found: first, the preprocessing of L-LDPE film by electron beam irradiation significantly increases the joint strength of the film specimens. Secondly, the joint strength of less tractable HDPE film specimens is approximately four times higher than that of LDPE film specimens if they have been joined under the common joining condition. Consequently, we have reached the conclusion that the mechanism of ultrasonic joining of polyethylene films should be attributed to the entanglement of the amorphous molecules or molecular chains in the vicinity of the joining interface with other ones such as the tie molecules connecting the lamella structures in the crystalline region.