JPH027804Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention provides a step-like shape with outer layer paper B and inner layer paper C and cuts it to form a cylindrical body having pleats 2, 2 on both sides. Inlet 3 in the upper corner of one fold.
A step-like step 4, 4 is formed on the upper and lower edges of the cylindrical body.
The upper and lower folded pieces 5, 5 that have been formed are each folded back and pasted with adhesive to close the opening and bottom, which is the same as the protrusion forming the air inlet formed at the bottom corner of the inner layer paper of the bag. This relates to improvement of the large defective part and both folds.

Conventional technology The formation of the inner layer paper for this type of bag, which has been widely used in the past, takes into account efficient material settings that improve production efficiency and significantly reduce the loss rate relative to the absolute amount of base paper used, as shown in Figure 4. The inner layer paper C is continuously cut into a cylindrical body as shown in FIG . 6, a cutout 7 having the same dimensions as the protrusion is formed symmetrically at the left corner of the bottom.

Problems to be Solved by the Invention However, conventional bags of this type have an outer layer of a cylindrical body consisting of an upper and lower bent piece with pleats formed on both sides of the cylindrical body and a step-like step formed on the upper and lower edges. and an inner layer cylindrical body formed as shown in FIG. The bag is almost box-shaped and is designed to allow for orderly loading.However, when producing bags, the knurled pull-out wheel for advancing each layer of paper acts on these folds, so the folds are folded. There are many cases where the folds of the bag break due to the paper fibers being damaged during packaging and transportation. In addition, the inner cylindrical body at the bottom corner on the side of the inlet has a defective part with the same dimensions as the protruding part forming the inlet. It is nothing more than one layer of outer paper that maintains its strength. Therefore, the strength of this defective portion is extremely weak and often causes the bag to break. Therefore, conventionally, measures have been taken to maintain strength by interposing a reinforcing material separately provided in this defective portion. Therefore, there were defects such as requiring extra auxiliary materials and significantly reducing production efficiency. The present invention relates to a completely new technique developed in view of these conventional problems.

Means and Effects for Solving the Problems The present invention, which solves the above-mentioned problems, has two folds and a bottom fold, as shown in the plan view of FIG. Reinforcing members 8, 8 with a length corresponding to the length of the curved piece are interposed between the inner and outer paper layers of both the folds to reinforce both the folds 2 and the defective part 7 to prevent each from weakening. Therefore, a heavy-duty packaging bag with reinforced folds and bottom corner defects, which maintains the strength of both folds and the defective portion of the bag and completely prevents the bag from tearing during packaging, transportation, etc. It is.

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

Each reference numeral is the same as that used in the explanation of FIGS. 1 to 3. Outer layer paper B forming the heavy packaging bag of the present invention
Similar to the plan view shown in FIG. 1, this is an upper and lower bent piece in which pleats 2, 2 are formed on both sides of a cylindrical body 1, and step-like steps 4, 4 are formed on the upper and lower edges of the cylindrical body. 5, 5 are formed symmetrically to form an outer layer cylindrical body.

In addition, the inner layer paper C has folds 2, 2 formed on both sides as shown in the plan view shown in FIG. Upper and lower bent pieces 5, 5 having steps 4, 4 are arranged in series, and a protrusion 6 forming the air inlet 3 and a protrusion 6 having the same dimensions as the protrusion are provided at the left corner of the mouth. A cutout 7 is symmetrically formed at the bottom left corner to form an inner cylindrical body. Next, as shown in the plan view of FIG. 7, reinforcing materials 8, 8 made of paper or the like having a length corresponding to the length of the pleats 2 and the lower folded piece 5 are inserted between the inner and outer paper layers of both the pleats. This reinforcing material is dot-attached to either the base paper of the inner or outer paper layer to form a bond.

In addition, FIG. 4 shows the inner layer paper C combined with the outer layer paper B.
FIG. 5 is an explanatory diagram for cutting the inner layer cylindrical body continuously and efficiently, and the plan view shown in FIG.
It is a top view of the inner layer cylindrical body for one bag cut by the cutting method shown in the figure.

In constructing the heavy-duty packaging bag according to the present invention, an outer layer cylindrical body and an inner layer cylindrical body formed from the above-mentioned outer layer paper B and inner layer paper C are combined, and the outer layer cylindrical body and the inner layer cylindrical body are formed on both sides of the cylindrical body. Reinforcing materials 8, 8 made of paper or the like having a length corresponding to the length of the pleats 2 and the lower folded piece 5 are interposed between the inner and outer paper layers of both the pleats, and these reinforcing materials are dotted on the base paper of the inner layer paper. Paste it.

Next, the portion where the protruding portion 6 of the inner layer cylindrical body overlaps the outer layer cylindrical body is folded inward in a substantially triangular shape to form the air inlet 3, and the upper bent piece 5 is placed along the line E-A. The opening is attached to the side wall of the outer cylindrical body. Furthermore, the bottom part is constructed by overlapping the lower end of the reinforcing material interposed between the inner and outer paper layers that form folds in the defective part, and inserting the lower bent piece 5 along the roller line symmetrically with the mouth part to form the outer layer cylindrical body. The heavy packaging bag of the present invention is made by laminating the bottom part to the side wall of the bag. When using the heavy packaging bag according to this invention,
When the nozzle of the filling machine is inserted into the blowing port 3 and the nozzle is pulled out after filling the bag with air, the blowing port is closed by the pressure inside the bag.

Function The heavy-duty packaging bag according to the present invention is composed of two layers, the inner and outer layers, as described above, and has folds on both sides, and steps are formed on the upper and lower sides of the cylindrical body in a symmetrical manner from one side of the front and back walls to the other. A defective part formed symmetrically with the protruding part of the inner layer cylindrical body when a bent piece is formed and the bent piece is attached to the front and rear walls of the cylindrical body to close the mouth and bottom. Since the reinforcing material is interposed between the folds and the folds on both sides, the folds and the defective parts can be efficiently reinforced at once, and the production efficiency is increased.
In addition, this type of bag, which has been widely used in the past, has an air inlet, and due to the stair-cut cut characteristic of this bag, the non-return valve of the air inlet is short in steps. In contrast, in forming the inlet of the heavy-duty packaging bag of the present invention, the projecting portion 6 of the inner layer cylindrical body is folded inward at the same time as the overlapping portion of the outer layer cylindrical body, so there is no risk of non-returnability. The valve is elongated inwardly and has a perfect non-return valve effect. Therefore, leakage of stored items from the air inlet is completely prevented. In addition, in the bag that has been widely used in the past, a defective part of the same size as the protruding part is formed at the corner of the folded piece of the inner layer cylindrical body forming the bottom, and the outer layer cylindrical body is held by only one layer of outer layer paper. Since the pressure of the contents is directly applied as a load to this defect, this can cause it to burst. Therefore, in order to reinforce only this defective part,
A rectangular reinforcing piece was provided separately, and the defective part was reinforced with the rectangular reinforcing piece, but with this invention, there is no need to provide a separate reinforcing piece, and there is no need to provide a separate reinforcing piece. It is only necessary to attach a reinforcing material with a length corresponding to the length of the pleats and the lower folded piece during the bag making process, which is very convenient. In addition, in the conventional bag-making process, when configuring the inlet of the inner layer cylindrical body, the shaded part A in Fig. 3 was cut off, resulting in waste, which was very uneconomical, but the present invention eliminates this problem. There is no loss of part A, which increases production efficiency.

Effects Therefore, the heavy-duty packaging bag of the present invention has a simple structure, can be easily filled, and will not break at the folds or defective parts even when the load is moved during any process. In addition, even if one layer of base paper is reduced compared to conventional bags, by inserting reinforcing materials in both pleats and the defective part, we can provide a heavy packaging bag that does not have any problems in terms of strength in practical terms.
The object of the present invention is to provide a heavy-duty packaging bag that contributes to saving the absolute amount of base paper used, completely reinforces the wall portion and the defective portion, and is economically inexpensive and has the highest practical value.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a state in which the corner portion of the mouth of the cylindrical body is folded into a substantially triangular shape inside the cylindrical body, and Fig. 2 shows the upper and lower bent pieces of Fig. A front view of a bag with an inlet formed by bending each roll symmetrically from the Ro-Ro wire, Figure 3 is an explanatory diagram of the cutting method for constructing a general non-return valve, Figure 4 is the inner layer paper of the present invention. 5 is a front view of one bag's worth of inner layer cylindrical body cut by the cutting method shown in FIG. 4, and FIG. 6 is an illustration of the outer layer of the present invention. Seventh front view of a cylindrical body that combines a cylindrical body and an inner layer cylindrical body
The figure shows that the protruding part 6 in Fig. 6 is folded into the inside of the cylindrical body.
FIG. 8 is a plan view showing a reinforcing material interposed between the folds on both sides, and the reinforcing material is applied to the protruding part 6 and the fold part 2 on the side of the defective part 7 of the inner layer cylindrical body D used as the inner layer of the present invention. FIG. 9 is an explanatory diagram of a portion in which a reinforcing material is interposed in the folds on the side of the air inlet. In addition, each symbol in the figure is A: the cut-off part, B: outer layer paper, C: inner layer paper, D : inner layer cylindrical body, 1: cylindrical body,
2, 2 is a fold, 3 is an inlet, 4, 4 is a step, 5,
5 is an upper and lower bent piece, 6 is a protruding part, 7 is a missing part, 8,
8 indicates each reinforcing material.

Claims (1)

[Scope of utility model registration request] An inner layer cylindrical body having a defect of the same size as the protrusion forming the air inlet and an outer layer cylindrical body made of outer layer paper are provided with a step on one side edge vertically and symmetrically from one side of the front and rear walls to the other. Next, a corner of the mouth of the cylindrical body is bent inside the cylindrical body to form an air inlet, and the bent pieces are pasted on the side wall of the cylindrical body. A folded part of a heavy packaging bag having a closed opening and a bottom part, characterized in that a reinforcing material having a length corresponding to the length of the folded part and the lower folded piece is interposed between the paper layers of both folded parts. and heavy packaging bags with reinforced bottom corner defects.