JPS601077Y2 - square bottom bag - Google Patents

Description

[Detailed explanation of the idea] This invention relates to square bottom bags.

Conventional square-bottomed bags were constructed by bending and gluing the bottom plate, which had the disadvantages that there was a risk that the glued bottom would peel off and the bottom would fall out, and that it was difficult to form by assembly line operations. .

The purpose of this invention is to provide a sturdy square-bottom bag with an easy bottom shape by joining the M-shaped bent portions on both sides without joining the bottom surface.

In order to satisfy the above objectives, this invention is constructed as follows.

That is, this device consists of a main plate 1 made of one elongated strong paper sheet, and the left and right sides are folded inward along the longitudinal direction to form an M.
A shaped folded part forming piece 2, 2' is formed, and two folds 3.3' are made in the center perpendicular to the longitudinal direction to form both folds 3, 3'.
The space is divided into the bottom 4 and the front and back parts 5, 6, and overlapping pieces 8, 8 are overlapped and bonded to the adhesive pieces 7, 7' located on both sides of the bottom 4.
′ between the two folds 3, 3′ and the outer fold 9°9
A corner formed by forming adhesive application parts 10, 10' between the M-shaped folding part forming pieces 2, 2' at the ends of the M-shaped folding part forming pieces 2, 2' and further connecting the M-shaped folding part forming pieces 2, 2'. It's a bottom bag.

Since this device has the structure described above, after folding the M-shaped folding portion forming pieces 2 and 2' as shown in FIG. When folded as shown in Figure 4, a square bottom is formed, and the M-shaped folded part can be shaped into a bottom shape, and the overlapping pieces 8゜8' are joined to the adhesive pieces 7 and 7', so that the joint part does not appear on the bottom surface. .

Therefore, it is possible to obtain a square bottom bag that does not have a bottom that falls off and is easy to manufacture.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the square bottom bag according to this invention, in which Fig. 1 is a perspective view, Fig. 2 is a developed plan view, and Fig. 3 is a plan view in the middle of folding. 4 is a plan view when molding is completed, FIG. 5 is a sectional view taken along the line AA in FIG. 4, and FIG. 6 is a sectional view taken along the line BB in FIG. 4. 1...Main plate, 2, 2'...M-shaped folding part forming piece, 3.3'...Fold, 4...Bottom, 5. ...Front part, 6...Rear part, 7,
7'...adhesive piece, 8,8'...polymerized piece, 9,9'...fold, 10,10'...
・Adhesive application part.

Claims (1)

[Scope of utility model registration request] A piece of elongated strong paper is cut from the main plate 1, and the left and right sides are folded inward along the longitudinal direction to form M-shaped folded portion forming pieces 2, 2', and the center part perpendicular to the longitudinal direction. Two folds 3, 3' are formed on the bottom 4 to divide the space between the two folds 3, 3' into a bottom 4 and a front back part 5, 6, and adhesive pieces 7, 7' located on both sides of the bottom 4. Forming polymeric pieces 8, 8' to be overlapped and bonded to the above two folds 3.3' and between the outer folds 9, 9',
Furthermore, adhesive application parts 10, 10' for connecting the M-shaped folding part forming pieces 2 and 2' are provided at the ends of the M-shaped folding part forming pieces 2 and 2' to form a square bottom bag.