风琴袋 meaning in English

accordion pocket
bellows pocket

General packaging materials include : 3 - side seal , center seal , side seal with gusset , center seal with gusset , tray lid , rolls , retort pouch ( this pouch may look like other regular pouches , but it actually made up of different kinds of materials which enable the pouch to be heated and sterilized )
其它包装材料包括:三边封袋，中封袋，风琴袋，中间封风琴袋，封口膜，卷膜，蒸煮袋（袋子本身可以在蒸或煮的高温情况下使用，对内包物进行加热和杀菌）。