JPH027805Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to the improvement of the inlet of a paper bag with an inlet.
This increases the strength of the air inlet and prevents the air inlet from deforming into a curved shape when filling with stored items.

Prior Art A cylindrical body with pleats on both sides, an air inlet formed in the upper corner of one of the folds, and upper and lower bent pieces with step-like steps formed on the upper and lower edges of the cylindrical body. Paper bags have been widely developed that have a mouth and a bottom that are glued together (see Figure 2).

Problems to be Solved by the Invention However, the formation of the inlet and upper opening of this type of bag, which has been widely developed in the past, is
As shown in the figure, fold the upper corner of one of the folds of the cylindrical body inward, apply adhesive to the bent pieces on the front and rear walls of the cylindrical body, and attach this folded piece to one side of the cylindrical body. The pieces are bent at the same time and laminated together to form an upper mouth portion having an air inlet. Therefore, when applying adhesive to the bent pieces of the front and rear walls, the cylindrical body is cut in steps, or the adhesive application surface is flattened due to the lamination mechanism of the bottom pasting machine. In this case, adhesive is applied to the outside of the front wall bent piece, the outside of the step-like pleats, and the inside of the rear wall bent piece (portions indicated by dots in FIG. 3). Therefore, when the air inlet is formed, the upper part of the air inlet is formed by folding the upper corner of the pleat part inward, and only the portion that overlaps the front and rear wall bent pieces of the folded piece is formed using adhesive. It is pasted together.

Therefore, it is very difficult to shape the inlet of this type of paper bag, and when filling the bag, the upper part of the inlet is only the part that overlaps the folded pieces on the front and rear walls of the folded piece. Since the inlet was bonded with an adhesive, the strength of the inlet was significantly reduced and there were defects such as easy deformation into a curved shape. The present invention relates to a completely new technique developed in view of these conventional problems.

Means and operation for solving the problems The present invention, which solves the above-mentioned problems, consists of an inlet and an upper opening A of a paper bag having an inlet, and the upper corners of the folds are folded inward. When the inlet is configured with folded pieces, an adhesive layer is provided inside the overlapping parts of the upper front and rear wall folded pieces to increase the strength of the inlet and to prevent loosening of the inlet when the nozzle is inserted during filling. This is a paper bag with a blowing spout that is neatly shaped and completely prevents damage.

Example An example of the embodiment will now be described in detail in conjunction with the drawings.

Folds 2, 2 are formed on both sides of the cylindrical body 1, and an air inlet 3 is formed by a folded piece formed by folding the upper corner of one of the folds inward. The bent pieces 5, 5' forming the stepped steps 4, 4 are pasted symmetrically to the front and rear walls of the cylindrical body via the adhesive 6 along the E-I wire and the Ro-Ro wire to form a paper bag. When the folded piece 8 is opened by folding the upper corner of the pleat inward, an adhesive layer 9 is applied to the bent pieces 5A and 5B on the outside of the E-A line, respectively. Part A constitutes a paper bag with a blowing spout according to the present invention.

When using the paper bag according to the present invention, the nozzle of the filling machine is inserted into the blowing port 3, and after filling the bag with air and the contents, when the nozzle is pulled out, the folding port is closed by the internal pressure of the bag.

Function The paper bag with an inlet according to the present invention has pleats on both sides, and the upper corner of one of the pleats is folded inward to form an inlet, and one of the front and rear walls is placed on the top and bottom of the cylindrical body. A bent piece protruding vertically symmetrically from one side to the other in a stepped shape with a step on one side edge is pasted with adhesive to close the opening and bottom to form an inlet when constructing a paper bag. An adhesive layer 9 is provided on the inside where the front and rear wall folded pieces of the folded piece are overlapped, and the folded pieces 8 are pasted together, and then the front and rear wall folded pieces 8 are bonded to each other on the outside 5A, 5 of the front and rear wall folded pieces.
Since B is overlapped at the same time and double closed, the air inlet can be shaped to be strong.

Effects Conventionally, the part where the adhesive is applied in the widely developed air inlet configuration is only the overlapped part of the folded piece shown by the number 7 above the E-I line. Compared to the case where the nozzle is very weak and easily deforms when filled with stored items, further reducing its strength, the adhesive layer 9 is interposed above the nozzle, and the strength is significantly increased by bonding a wide area. This prevents the air inlet from becoming loose or deformed. Next, since the blowing port is neatly shaped, it is easy to insert the nozzle of the filling machine, and the efficiency of the filling operation is improved. Furthermore, it is an object of the present invention to provide a heavy-duty packaging bag with a blowing spout, which has great practical effects such as being able to completely prevent bag breakage from around the blowing spout.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a state in which the mouth corner of a cylindrical body, which has been widely used in the past, is folded into a substantially triangular shape inside the cylindrical body, and Fig. 2 shows the upper and lower folded pieces of Fig. 1. I-
A. A front view of a bag with a mouth part A and a bottom part B attached to the cylindrical wall bent from each line of Ro-Ro. Figure 3 is a plan view with the lower half of Figure 1 omitted. FIG. 4 is an explanatory diagram of the applied state of the adhesive layer when forming the mouth 3 and the upper mouth part A. FIG. Figure 5 is an explanatory diagram of the adhesive layer before forming the inlet, Figure 6 is an explanatory diagram of the adhesive layer above the inlet. The codes are 1: cylindrical body, 2, 2: folds, 3:
is the air inlet, 4 is the step, 5A is the front wall bent piece, 5B is the rear wall bent piece, 5 and 5' are the bent pieces, 6 is the adhesive, 7 is the overlapping part of the bent pieces of the air inlet, 8 is the folded piece Pieces 9 and 9 show the adhesive, A shows the top part, and B shows the bottom part, respectively.

Claims (1)

[Scope of utility model registration request] A cylindrical body having folds on both sides, and an upper corner of one of the folds folded inward to form an air inlet;
It is made by pasting bent pieces vertically symmetrically upward and downward of a cylindrical body in a step-like manner with a step on one side edge from one side of the front and rear walls to the other, and closing the opening and bottom. 1. A paper bag with an air inlet, characterized in that an adhesive layer is applied to the overlapping inner side of the front and rear wall folded pieces of the folded pieces constituting the air inlet.