JP3013978U - Paper bag - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a paper bag which can be easily joined to a semi-finished bottom with a reinforcing plate and can be easily manufactured. A double-sided flap 2 formed by bending both side portions is formed at one end of a rectangular tube-shaped bag body 1, and a front-rear flap 3 formed by bending the front-rear portion of the bag body 1. A reinforcing plate 5 is attached to the surfaces of the both side flaps 2 in a bent state so as to straddle each side flap 2, and the front and rear flaps are attached to the surfaces of the both side flaps 2 to which the reinforcing plate 5 is attached. It is characterized in that the bottom portion 4 is formed by bending 3 into a three-fold state and joining the both side flaps 2 with an adhesive.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper bag, and more particularly to a paper bag in which a reinforcing plate is attached to a bottom portion formed by closing one end of a rectangular tubular bag body.

[0002]

[Prior art]

 In general, a paper bag having a rectangular tube-shaped bag body and having a bottom portion formed by closing one end thereof is often used.

FIG. 4 shows such a conventional paper bag, which has a square tube-shaped bag body 1, and one end portion of the bag body 1 is formed by bending both side portions thereof. Both side flaps 2 and 2 are formed, and front and rear flaps 3 and 3 formed by bending the front and rear portions of the bag body 1 are also formed. Then, the bottom flap 4 is formed by joining the side flaps 2 and the front and rear flaps 3 with an adhesive, whereby a paper bag having the bottom flap 4 is formed. .

In such a paper bag, when a stored item is stored inside, pressure may be applied to the bottom part 4 due to the weight of the stored item and the bottom part 4 may be damaged. A reinforcing plate 5 is attached to the outside of the front and rear flaps 3.

However, in such a conventional paper bag, since the reinforcing plate 5 is attached from the outside of the front and rear flaps 3, it is relatively strong against pressure from the outside of the bag body 1. However, when pressure is applied from the inside of the bag body 1, the bottom portion 4 is easily damaged and there is a problem that the reinforcing plate 5 has little effect of reinforcement.

Therefore, as shown in FIG. 5, conventionally, the reinforcing plate 5 is attached from the inside of the both side flaps 2 of the bag body 1.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned conventional paper bag, usually, the part which becomes the bottom part 4 after the bag body 1 is completed is expanded forward and backward, and the flaps 2 on both sides of this expanded part are bent, so that this expanded part After squeezing into a flat shape, a semi-finished octagonal bottom is formed on the bottom 4 of the bag body 1, and then the front and rear flaps 3 at the front and rear ends of the semi-finished bottom are folded into three and expanded The side flaps 2 and the front and rear flaps 3 of the part are joined by an adhesive to form a square bottom portion 4. As described above, the inside flaps of both side flaps 2 of the bag body 1 are covered. When the reinforcing plate 5 is attached, the reinforcing plate 5 must be inserted inside the both side flaps 2 when the semi-finished bottom is crushed into a flat shape, which complicates the manufacturing process of the semi-finished bottom. And the manufacturing work becomes extremely difficult. There is a problem that the manufacturing apparatus also requires a complicated mechanism.

The present invention has been made in view of the above points, and an object of the present invention is to provide a paper bag that can be easily joined to a semi-finished bottom with a reinforcing plate and can be easily manufactured. Is.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the paper bag according to the present invention has a double-sided flap formed by bending both sides of one end of a rectangular tube-shaped bag body and bending the front and rear parts of the bag body. The front and rear flaps are formed, and the front and rear flaps are bent in three in a folded state on the surfaces of the both side flaps in a bent state, and the bottom portions are formed by bonding the both side flaps with an adhesive. In the paper bag formed as described above, a reinforcing plate is attached between the both side flaps and the front and rear flaps so as to straddle the both side flaps.

[0010]

[Action]

 According to the paper bag of the present invention, the reinforcing plate is attached to the surfaces of the both side flaps that are bent inward, and the front and rear flaps are attached to the reinforcing plate to form the bottom portion. Therefore, as compared with the conventional case where the reinforcing plates are attached to the insides of the both side flaps, the reinforcing plates can be joined more easily and the manufacturing work can be performed efficiently. In addition, the mechanism of the manufacturing apparatus can be simplified. In addition, compared with the case where a reinforcing plate is attached to the outside of the front and rear flaps, when pressure is applied from the inside of the bag body of the paper bag, the reinforcing effect of the bottom part can be significantly enhanced, and damage to this bottom part can be ensured. In addition, since the front and rear flaps are bonded to the outside of the reinforcing plate, the entire reinforcing plate is not exposed at the bottom, and the appearance is not spoiled.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIGS. 1 and 2 show an embodiment of a paper bag according to the present invention, which has a rectangular tube-shaped bag body 1 and one end of the bag body 1 Both side flaps 2 and 2 are formed by bending both side portions thereof, and front and rear flaps 3 and 3 are formed by bending the front and rear portions of the bag body 1.

Further, in this embodiment, the reinforcing plate 5 is attached to the surface of the both side flaps 2 which are bent and formed inward by an adhesive so that the reinforcing plate 5 straddles each of the both side flaps 2. The front and rear flaps 3 are bent into three folds on the surface of the both side flaps 2 to which the reinforcing plate 5 is attached, and the adhesive agent is attached to the both side flaps 2 and the reinforcing plate 5. Are joined by. By attaching the front and rear flaps 3 to the both side flaps 2 via the reinforcing plate 5 in this manner, the bottom portion 4 of the bag body 1 is formed, whereby a paper bag having the bottom portion 4 is formed. To be formed.

The reinforcing plate 5 may be formed of, for example, a normal paper material, or may be formed of a thick paper such as a cardboard, and further formed of a resin film or the like. You may

In this embodiment, since the reinforcing plate 5 is attached between the both side flaps 2 and the front and rear flaps 3 which are bent inward, the reinforcing plate 5 is attached to the outer side of the front and rear flaps 3. When the pressure is applied from the inside of the bag body 1 of the paper bag, the reinforcing effect of the bottom portion 4 can be remarkably enhanced as compared with the case of adhering. Moreover, since the front and rear flaps 3 are bonded to the outside of the reinforcing plate 5, the entire reinforcing plate 5 is not exposed at the bottom portion 4, and the appearance is not spoiled.

Therefore, in this embodiment, the reinforcing plate 5 is attached to the front surface of the both-side flaps 2 which are bent inward, and the front and rear flaps 3 are attached to the reinforcing plate 5 attached. Since the bottom portion 4 is formed by doing so, it is possible to easily perform the joining work of the reinforcing plate 5 as compared with the conventional case where the reinforcing plate 5 is attached to the inside of the both-side flaps 2. Therefore, the manufacturing work can be performed efficiently, and the mechanism of the manufacturing apparatus can be simplified. In addition, the reinforcing effect of the bottom portion 4 by the reinforcing plate 5 is high, and it is possible to reliably prevent the bottom portion 4 from being damaged.

In the above-described embodiment, the reinforcing plate 5 is formed to have a size located inside the bottom portion 4. However, as shown in FIG. It may be formed in such a size that it reaches the base of the base 3.

Further, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made as necessary.

[0019]

[Effect of device]

 As described above, the paper bag according to the present invention has a bottom portion by attaching a reinforcing plate to the surfaces of both side flaps that are folded inward, and attaching the reinforcing plates to the front and rear flaps. As compared with the conventional case where a reinforcing plate is attached to the inner sides of both side flaps, the reinforcing plate can be easily joined, and the manufacturing work can be performed efficiently. It can be carried out, and the mechanism of the manufacturing apparatus can be simplified. Moreover, the reinforcing effect of the bottom portion by the reinforcing plate is high, and it is possible to surely prevent the bottom portion from being damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a paper bag according to the present invention.

FIG. 2 is a perspective view showing a state before the front and rear flaps of the paper bag of the present invention are attached.

FIG. 3 is a perspective view showing another embodiment of the reinforcing plate of the present invention.

FIG. 4 is a perspective view showing a conventional paper bag.

FIG. 5 is a perspective view showing another conventional paper bag.

[Explanation of symbols]

 1 bag body 2 both side flaps 3 front and rear flaps 4 bottom 5 reinforcement plate

Claims (1)

[Scope of utility model registration request] 1. A double-sided flap formed by bending both side portions at one end of a rectangular tubular bag body, and a front-back flap formed by bending the front-back portion of the bag body. A paper bag having a bottom portion formed by bending the front and rear flaps into three in a folded state on the surfaces of the both side flaps in a bent state and joining the both side flaps with an adhesive to form a bottom portion. A paper bag characterized in that a reinforcing plate is attached between the front and rear flaps so as to straddle each side flap.