Vacuum fresh-maintaining plastic bag
a plastic bag and vacuum technology, applied in the field of vacuum fresh-maintaining plastic bags, can solve the problem of not being able to put the whole plastic bag into the vacuum chamber for vacuum-pumping
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first embodiment
The First Embodiment
[0017] As shown in the FIG. 1 and FIG. 2, the vacuum fresh-maintaining plastic bag includes two layer thin film, and the opposite inner surface of each of the thin film is in the shape of the parallel concave-convex channel, and the channels of the two opposite inner surfaces are intersected with each other by the angle of 0.degree.<.alpha..ltoreq.9-0.degree. therebetween.
[0018] The film (1, 2) includes two layers (5, 6), the inner layer 5 is made of the PE plastic material, while the outer layer 6 is made of the PA plastic material, the inner layer 5 and the outer layer 6 are recombined into the concave-convex channel shape, the channels 3 are arranged in line, and the films (5, 6) are in a wavy shape, the channels 3 of the film 5 and film 6 are intersected to each other by the angle of 0.degree.<.alpha..ltoreq.90.degree. therebetween after the films (5, 6) being packaged into the bag. The section of the above channels is in the triangle shape, and the distance ...
second embodiment
The Second Embodiment
[0019] As shown in the FIGS. (3), (4), and (5), the vacuum fresh-maintaining plastic bag includes a two layer thin film, and the two opposite inner surfaces both have the concave pits. The recess direction of the said concave pits along the opposite inner surface is directed to the outside, and the pits of the two opposite inner surfaces are intersected or being faced each other. The said films (1, 2) are in two layers (5, 6), the inner layer 5 thereof is made of the PE plastic while the outer layer 6 is made of the PA plastic. The inner layer 5 and the outer layer 6 are pressed into the regularly arranged pits after they are recombined together. The pits on each of the two opposite surfaces are regularly arranged without communication to each other, the width of the pits are disposed in proportion with the distance between the pits in order to keep better air flowing, the route of the air flowing is shown in the FIG. (6).
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