The invention discloses an air-exhausting flexible packaging bag for
frozen vegetables, belonging to the technical field of flexible packages. A packaging bag body is provided with micron-scale
breather holes punctured by
laser, wherein the diameters of the
breathing holes are 60-300 mu m, the distance between every two
breathing holes is 4-500mm, and the
breathing holes are in 1-16 rows. A preparation method of the air-exhausting flexible packaging bag comprises the step of: arranging a film on a material feeding device; setting the parameter of the breathing holes on a central controller and sending the parameters to a high-pulse
laser source;
synchronizing the material feeding speed with the speed of a rotary
prism lens so as to ensure that a distribution
laser beam can puncture regular and ordered breathing holes on a
composite film; and finally, slitting the film punctured with the breathing holes and
processing into bags. The packaging bag is made of a PE (
Poly Ethylene)
composite membrane or a PE multilayer co-
extrusion composite membrane, is suitable for flexible packages of
frozen vegetables at -18 DEG C, modified-
atmosphere vegetables at 0-4 DEG C, and
frozen vegetables for
microwave oven heating. When being heated, the packaging bag exhausts air automatically so that explosion cannot occur. In addition, because the breathing holes are of micron-scale, the air-exhausting flexible packaging bag has good
pollution resistance and causes no potential
food safety hazard.