envelope
envelope(封袋), 此释义来源于网络辞典。
bag closure
... back pressure valve 反压阀;止回阀 bag closure 封袋 batchwise operation presure leaf filter 间歇式加压叶滤机 ...
bag closing machine ; bag sealer ; bag sealing machine
valve bag ; Ziplock Bag ; Zip Lock Bags ; self-styled bags
hot weld encapsulation