JPS5852222Y2 - Vacuum packaging bag - Google Patents

Description

[Detailed description of the invention] The present invention is to weld and seal one end and both side edges of the front and back layers 1 and 2.
, 3. In a flat resin bag 5 having an opening 4 at the other end, the front and back layers 1 and 2 of the opening 4 are folded to the front side along a bending line a parallel to the edge of the opening 4. Alternatively, the present invention relates to a vacuum packaging bag having a slight bend 5' on either side of the back side.

The front and back layers 1 and 2 are rectangular laminate reinforcing layers made of polyethylene or PP, and are relatively strong thin film layers.

To perform the bending process along the bending line a, place the front and back layers 1 and 2 of the opening 4 on the pedestal 6 shown in FIG. By pressing the front and back layers 1.2 and heating them to an appropriate temperature, the front and back layers 1.2 can be given a bending habit along the bending line a.

The bent portion 5' thus formed is slightly bent to one side of both layers 1 and 2 (this state is shown in FIG. 3).

In the figure, 8 indicates a vacuum packaging machine, 9 is its lid, 10 is a heating plate, 11 is a presser plate, and 12 is a presser.

Therefore, after opening the surface layer 1 and back layer 2 of the bent portion 5' and filling the inside with contents, both layers 1 and 2 are stacked in their original state, and this is placed horizontally inside the vacuum packaging machine 8. When the bending line a is placed outside the heating plate 10, the bent portion 5' is placed outside the heating plate 10 in a downwardly bent state.

The bent portion 5' must not be bent upward.

When the lid 9 is closed in this state, the front and back layers 1 and 2 are sandwiched between the presser plate 11 and the heating plate 10, and when the vacuum pump is operated to reduce the pressure inside the vacuum packaging machine 8, the air inside the bag 5 is removed. The bag 5 is brought into close contact with the contents.

In this state, the switch is closed, the heating plate 10 is heated, and the heating plate 10 can be heat-welded and sealed along the bending line a.

Conventionally, a bag is filled with contents, the front and back layers of the opening are aligned, and the bag is placed horizontally inside a vacuum packaging machine 8, and the opening is placed on a heating plate 1.
0, the upper surface layer edge of the opening is slightly shifted from the lower back layer edge, resulting in a slight opening.

When the bag was heat-sealed in this state, as shown in FIG. 5, creases 13 were formed and pinholes were formed along the creases 13, making it difficult to maintain the vacuum of the bag.

In this case, as described above, the front and back layers 1.2 of the opening 4 can be slightly bent 5', and the bent part 5' can be arranged downwardly on the outside of the heating plate 10, so that the opening 4 of the contents filling bag can be bent 5'. The upper surface layer 1 is not likely to shift from the lower back layer 2, the edges of both layers 1 and 2 are aligned, and the layers 1 and 2 are sandwiched between the heating plate 10 and the presser plate 11 and neatly heat-sealed to generate seams and pinholes. There is an advantage that vacuum packaging can be performed safely without any problems.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the vacuum packaging bag of the present invention, Fig. 2 is a front view of the bag, Fig. 3 is a longitudinal cross-sectional view taken along line A-A in Fig. 2,
FIG. 4 is a folded state diagram, and FIG. 5 is a perspective view of a conventional vacuum packaging bag. 1.2...Front and back layers, 2', 3...Welded sealing portion, 4...Opening, 5...Synthetic resin flat bag, a ...Bending line, 5'...
・Bending part.

Claims (2)

[Scope of utility model registration request] (1) One end and both side edges of front and back layers 1 and 2 are welded and sealed 2'
, 3L, in a flat plastic bag 5 having an opening 4 at the other end, the front and back layers 1 and 2 of the opening 4 are folded along the bending line a parallel to the edge of the opening 4 on the front side or A vacuum packaging bag with a slight bend of 5' on either side of the back side. (2) The vacuum packaging bag according to claim 1, wherein the front and back layers 1 and 2 are each a laminated reinforcing layer.