JPS644687Y2 - - Google Patents

Description

[Detailed description of the invention] This invention forms step openings 3, 3' at both ends of a cylindrical bag 2 having both pleats 1, 1, and the step openings 3, 3' are exposed at both corners of the openings 3, 3', respectively. The inclined cut ends 4 of the pleats 1, 1 are folded in a zigzag shape, one of the openings 3' is folded back to form the bottom sticking part 5, and the other opening 3 is unfolded from the first fold line a. Trapezoidal folded parts 6, 6' are formed at both corners of the trapezoidal folded part 6', and notches 7, 7 parallel to the folded line a are formed on both sides of the first folded line a in one trapezoidal folded part 6'. The tatami part 6' is unfolded to project the tongue piece 8 between the notches 7 and 7 outward, and the opening is opened slightly inside the tongue piece 8 along the second fold lines b, b provided on both sides of the first fold line a. This relates to a double-bottom pasted bag formed by folding back the part 3 to form a bottom pasting part 9 with an inlet. The cylindrical bag 2 has a spread paper 10 shown in FIG.
Fold along longitudinal fold lines 11, 12, 13,
It is formed by overlapping and pasting the opposite edges 14, 14' of the paper 10 (this state is shown in FIG. 2). One of the openings 3' is folded along the fold line c as shown in FIG. 3, and the opening 3' is closed and pasted to form the bottom sticking part 5. Also, the other bottom sticking part 9
In this method, the upper and lower edges 3'', 3'' of the opening 3 are folded in opposite directions from the second fold lines b, b, and the overlapping edges are pasted (FIG. 6). It is preferable that both sides of the tongue piece 8 are slightly folded back along the second fold lines b and b, and decorative paper is stuck to the bottom sticking part 9 for reinforcement. The above upper and lower bottom pasting parts 5,
9 can be mass-produced using a conventional bag making machine.

Therefore, grasp the tongue piece 8 shown in FIG. 6, insert the nozzle into the bag from the blowing port 15 along the tongue piece 8, blow the powder or granules into the bag from the nozzle, and then remove the nozzle. By removing the tongue piece 8 from the inlet 15 and attaching it by folding it back to the bottom sticking part 9,
5, and is pasted with hot melt adhesive 16 applied on both sides of the second fold lines b and b shown in FIG. 5, and vinyl acetate adhesive 1 as shown in FIG.
7th grade.

Conventionally, it was difficult to mass-produce double-bottomed bags from cylindrical bags with stair openings at both ends.The opening at one end was closed by folding and pasting after powder material was added, which required large packaging equipment, and simple packaging was not possible. It is difficult to apply.

Since the present invention is constructed as described above, not only can the bottom sticking part 5 of one side be formed very easily by simply folding and pasting the bottom sticking part 5 from the fold line c, but also the opening part 3 of the other side can be formed using a conventional manufacturing method. Not only is it possible to mass-produce the bottom patch 9 having the blow-in port 15 using a bag machine, it is extremely easy to obtain, but also when the tongue piece 8 is folded back to the bottom patch 9 to close the blow-in port 15 after storing the material. Since there are folded portions 8', 8' on both sides of the tongue piece 8, it is possible to prevent powdery substances from leaking from the inlet 15, and there is an advantage that the packaging equipment can be simplified.

[Brief explanation of drawings]

Figure 1 is a front view showing the unfolded sheet of the double-bottomed bag of the present invention, Figure 2 is a front view of the cylindrical bag, Figure 3 is a front view of the bag with one end attached to the bottom, and Figure 4 is the opening of the bag in its unfolded state. A front view, FIG. 5 is a front view of the state in which the tongue piece is formed, and FIG. 6 is a front view of the bottom sticking part with the blowing port. 1...both walls, 2...cylindrical bag, 3, 3'...stair opening, 4...slanted cut end, 5...bottom sticking part, a...
...First analysis line, 6, 6'...Trapezoidal folded part, 7... Notch, 8... Tongue piece, b... Second fold line, 9... Bottom sticking part with inlet.

Claims (1)

[Scope of utility model registration request] Step openings 3, 3' are formed at both ends of the cylindrical bag 2 having both pleats 1, 1, and inclined cut ends 4 of the pleats 1, 1 are exposed at both corners of the openings 3, 3', respectively. is folded in a zigzag shape, one of the openings 3' is folded back to form the bottom sticking part 5, and the other opening 3' is folded back to form the bottom sticking part 5.
is unfolded from the first fold line a to form trapezoidal folded parts 6, 6' at both corners thereof, and in one trapezoidal folded part 6', cutouts parallel to the fold line a are formed on both sides of the first fold line a. 7, 7, and expand the folded portion 6' to project the tongue piece 8 between the notches 7, 7 outward, and insert a second tongue piece 8 provided on both sides of the first fold line a slightly inside the tongue piece 8. Broken line b,
A double-bottom pasted bag formed by folding back the opening 3 along the direction b to form a bottom pasting portion 9 with an air inlet.