JP2003094535A - Method and equipment for manufacturing sack for packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for manufacturing a sack for packaging which enables efficient manufacture of the sack for packaging with a rib without causing waste of a film material and dispenses with disposal of chips of the film material. SOLUTION: The equipment 1 for manufacturing the sack for packaging has punching devices 8a and 8b for forming semicircular notched parts 15 and an elliptic punched part 17 in a continuous strip-shaped body 3 which is formed by folding a continuous tubular body 2 of the pliable film material F so that it is depressed in the diametral direction D thereof, two longitudinal cutting means 6 which cut the continuous strip-shaped body 3 in the longitudinal direction L at two different position, a thermally welding and cutting means 7 which forms a stuck part 5 where the folded film material F is stuck linearly in the width direction of the continuous strip-shaped body 3, at prescribed intervals in the longitudinal direction L of the body 3, and which cuts simultaneously the stuck part 5 to be divided along the direction of the line, and others.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing a packaging bag made of various film materials such as plastic films and sheet materials for containing fresh vegetables, fruits and other articles.

[0002]

2. Description of the Related Art When fresh vegetables and fruits are shipped to the market or displayed in retail stores such as supermarkets, plastic film packaging bags have been used. The size, shape, etc. of such a packaging bag vary depending on the application, but a typical packaging bag 90 is a packaging bag 90 as shown in FIG.

The packaging bag 90 includes a bag body 91 formed by sealing the left and right side edges 90a and the like, and a rib 92 protruding upward from the opening 94 of the bag body 91 in a tongue shape. Vent holes 91 are provided at both ends of the bottom portion 90b of the bag body 91.
a may be provided, or a seal portion (not shown) may be provided on the inner surface of the rib 92.

Now, with reference to FIG. 6, a conventional manufacturing method of the packaging bag 90 with ribs will be described. Figure 6
As shown in FIG. 6A, the rectangular film material F1 is displaced by the length of the ribs 92 and bent so as to overlap each other, and then, as shown in FIG. When heat-sealed, the opening 94 and the bottom 90b
A bag body 91 having the above is formed. After this, FIG. 6 (c)
As shown in FIG. 5, the packaging bag 90 is completed by notching both ends of the bottom portion 90b of the bag body 91 in a triangular shape or a fan shape to form the ventilation holes 91a.

[0005]

In the manufacturing process of the conventional packaging bag 90 shown in FIG. 6, a flat rectangular film material F1 is started, and this film material F1 is formed into ribs 9.
Since the bag body 91 must be formed by accurately bending it so that it overlaps with each other by shifting the length by two,
The process is complicated and it takes time to manufacture. Also, 1
Since only one packaging bag 90 can be manufactured from one film material F1, the work efficiency is poor.

On the other hand, the manufacturing of the packaging bag without ribs is carried out in the process as shown in FIG. As shown in FIG. 7, in the manufacturing process of the rib-less packaging bag 90x, the continuous tubular body 95 formed by the flexible film material F is folded so as to be crushed in the diametrical direction D, and the continuous belt-shaped body is folded. 96 is formed, and the continuous strip 96 is cut by the cutter C in the longitudinal direction L. Then, the continuous strip 96 divided into two in the longitudinal direction is overlapped by using the heat welding cutting device 97. Adhesive portions 97 that are adhered to each other linearly in the width direction W of the continuous strip 96 are formed at regular intervals in the longitudinal direction L of the continuous strip 96, and at the same time, the adhesive portions 97 are formed along the linear direction. The packaging bag 90x having the opening 94 is formed by dividing and cutting.

According to such a process, the rib-free packaging bag 90x can be efficiently manufactured, but it is impossible to manufacture the rib-containing packaging bag 90 by directly using this process. Is. Therefore, it is possible to complete the packaging bag 90 by post-processing the rib-less packaging bag 90x manufactured in the process shown in FIG. 7 to form the ribs 92 and the ventilation holes 91a. If bag 1
Since it is necessary to perform post-processing for each sheet, the work efficiency is extremely poor and it cannot be actually performed.

Further, if the rib 92 is formed by post-processing the rib-free packaging bag 90x, the packaging bag 90x is formed.
Since it is necessary to cut and remove one side of the film material F forming the opening 94 of x to form the ribs 92, the cut and removed pieces of the film material F become so-called chips and waste of the film material. Occurs. Further, since the scraps of these film materials cannot be easily disposed of by disposal or incinerated from the viewpoint of preventing environmental pollution, the disposal also requires a great deal of labor. Since the packaging bag 90 is mass-produced, it is expected that the amount of film chips generated in the post-processing will be large and cannot be ignored.

[0009] The problem to be solved by the present invention is to efficiently manufacture a packaging bag with ribs without wasting film material, and eliminate the need to dispose of chips of film material. , To provide a technology for manufacturing a bag for cut packaging.

[0010]

A method for manufacturing a packaging bag according to the present invention is a continuous strip formed by folding a continuous tubular body formed of a flexible film material so as to be crushed in its diameter direction. And a longitudinal cutting step of cutting the continuous strips in a longitudinal direction, and forming a sticking portion in which the overlapping film materials are linearly pasted in the width direction of the continuous strip at regular intervals in the longitudinal direction of the continuous strip. In the manufacturing method of the packaging bag, which has a sticking step for cutting and a horizontal cutting step for cutting the sticking portion along the line direction thereof, the vertical cutting step is performed at two positions apart in the width direction. Then, it is constituted by two single-sided cutting steps of cutting only one of the overlapping film materials in the longitudinal direction.

With this structure, only one of the overlapping film materials is cut in the longitudinal direction in the vertical cutting process including two single-sided cutting processes at two positions separated in the width direction. At this time, since the openings of the two packaging bags are formed in an opposed state from the cut portion, and at the same time, the respective ribs are also formed, the ribs can be formed in a continuous process. The bag can be efficiently manufactured. Further, since it is not necessary to cut and remove the film material when forming the ribs, there is no waste of the film material, and it is not necessary to dispose of chips of the film material.

Next, in the packaging bag manufacturing apparatus of the present invention, the continuous tubular body formed by folding a continuous tubular body formed of a flexible film material so as to be crushed in the diametrical direction thereof has its longitudinal direction. A vertical cutting means for cutting in a direction, and a sticking part that forms a sticking part that sticks the overlapping film materials linearly in the width direction of the continuous strip at regular intervals in the longitudinal direction of the continuous strip. In the apparatus for manufacturing a packaging bag, which is provided with a means and a horizontal cutting means for cutting the sticking portion along the line direction thereof, the vertical cutting means separates the continuous strip from the continuous strip in the width direction. Cut only one of the overlapping film materials at each position in the longitudinal direction 2
It is characterized by being constituted by one single-sided cutting means.

With such a structure, it is possible to properly carry out the above-described method for manufacturing a packaging bag, and thus it is possible to efficiently use a ribbed packaging bag without wasting film material. Since it can be manufactured, it is not necessary to dispose of chips of film material.

[0014]

1 is a perspective view, partly omitted, showing an apparatus for manufacturing a packaging bag according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.

As shown in FIG. 1, the apparatus 1 for manufacturing a packaging bag according to this embodiment folds a continuous tubular body 2 formed of a flexible film material F so as to be crushed in the diameter direction D thereof. Punching devices 8a and 8b for forming a semicircular cutout portion 15 and an oval punching portion 17 on the formed continuous strip 3 and the continuous strip 3 are cut in the longitudinal direction L at two different positions. The two longitudinal cutting means 6 and the sticking portions 5 in which the overlapping film materials F are linearly stuck in the width direction W of the continuous strip 3 are formed at regular intervals in the longitudinal direction L of the continuous strip 3. At the same time, it is equipped with a heat-welding cutting means 7 for dividing and cutting the sticking portion 5 along the line direction.

As shown in FIG. 2, the two vertical cutting means 6 are arranged at two positions respectively sandwiching the continuous strip 3 and separated by a predetermined distance in the width direction W of the continuous strip 3. Only one of the overlapping film materials F is in the longitudinal direction L.
A cutter 9 that cuts into pieces, a motor 10 that drives the cutter 9 via a drive shaft 14, a film sensor 11 that detects the position of the film material F, a cutter sensor 12 that detects the position of the cutter 9, and a film material F. It is composed of a position control device 13 for automatically controlling the cutting position of the cutter 9 with respect to.

The film sensor 11 detects the position of the film material F constituting the continuous strip 3, the cutter sensor 12 detects the position of the cutter 9, and the film sensor 11 and the cutter sensor 12 transmit the position to the position controller 13. Based on the detection signal, the position controller 13 raises and lowers the cutter 9 together with the motor 10 and the drive shaft 14 so that the cutter 9 cuts only one of the overlapping film materials F. It is automatically controlled to maintain its position.

Here, a method of manufacturing the packaging bag will be described with reference to FIG. For the continuous strip 3 fed from the upper right direction to the lower left direction (longitudinal direction L) in FIG. 1, punching devices 8a and 8b are semicircular at both end portions and the central portion of the continuous strip 3 in the width direction W, respectively. A notch 15 and an oval punch 17 are formed. These two notches 15 and one punched portion 17 are arranged in series in the width direction W of the continuous strip 3 and are formed at regular intervals in the longitudinal direction L thereof. The width of the packaging bag 20 as the final product is determined by the arrangement interval of the cutout portion 15 and the punched portion 17 in the longitudinal direction L.

After that, the continuous strips 3 fed in the longitudinal direction L are vertically separated with the continuous strips 3 sandwiched therebetween, and the widthwise direction W is increased.
Two cutters 9 placed at two positions apart from each other
Thus, the cuts 16 are formed in the overlapping film materials F, respectively. And the heat welding cutting means 7
However, a linear sticking portion 5 is formed along a virtual straight line 4 connecting the notch portion 15 and the punched portion 17 formed in the continuous strip 3 in the width direction W, and at the same time, divided cutting is performed along the sticking portion 5. As a result, the ribbed packaging bag 20 is formed.
In this case, a part of the notch 15 is the ventilation hole 2 of the packaging bag 20.
The punching portion 17 becomes the left and right side edges of the rib 23.

As described above, when the continuous strip 3 is cut from the upper and lower portions by the cutter 9 which constitutes the vertical cutting means 6, the openings 22 of the two packaging bags 20 face each other from the respective cuts 16. Since the ribs 23 are formed at the same time as the ribs 23 are formed in a state, it is possible to form the ribs 23 in a continuous process, thereby efficiently manufacturing the packaging bag 20 with the ribs 23. You can Also,
Since it is not necessary to cut and remove the film material F when forming the ribs 23, there is no waste of material, and the ribs 23
Since chips of the film material F are not generated in the forming step of (1), no labor is required for the disposal.

Further, since the punching device 8a forms the punching portion 17 with respect to the continuous strip 3, the packaging bag 20 formed in the opposing state by the heat-welding cutting means 7 can be easily separated. That is, the heat welding cutting means 7
When the adhering portion 5 is formed and cut by, the punching portion 17 prevents the film materials F from being welded to each other at the portions that should become the left and right side edges of the rib 23, and thus is formed in an opposed state. The independence of the ribs 23 is maintained, and the separability of the packaging bag 20 is ensured.

Since the ventilation hole 21 of the packaging bag 20 may be unnecessary depending on the object to be packaged, the punching device 8b in the packaging bag manufacturing apparatus 1 shown in FIG. 1 is eliminated and the punching device 8a is eliminated. If the step of forming only the punched portion 17 is adopted, it is possible to manufacture a packaging bag without the vent hole 21.

Next, with reference to FIGS. 3 and 4, an explanation will be given of a manufacturing apparatus for a packaging bag which is a second embodiment of the present invention. In FIGS. 3 and 4, members and devices having the same functions and effects as those of the members and devices shown in FIGS. 1 and 2 are denoted by the same symbols as those in FIGS. 1 and 2 and description thereof is omitted. .

The packaging bag manufacturing apparatus 31 of the present embodiment is
As shown in FIGS. 3 and 4, as a vertical cutting means 36 for cutting the continuous strip 3 in two different positions in the longitudinal direction L, the vertical stripping means 36 is located inside the continuous strip 3 fed in the longitudinal direction L. A cutting blade holder 36a and a cutting blade 36b that is vertically provided on the upper and lower surfaces of the cutting blade holder 36a are provided.

In the case of the packaging bag manufacturing apparatus 31, as shown in FIG. 4, since the cutting blade holder 36a is arranged inside the continuous strip 3, the overlapping film material F is cut into the cutting blade holder 36a. Can be cut by the respective cutting blades 36b in a completely isolated state. Therefore, each cutting blade 36b can surely cut only the one film material F in the longitudinal direction L without damaging or erroneously cutting the other film material F.

The vertical cutting means 36 constituting the packaging bag manufacturing apparatus 31 includes a cutting blade holder 36a and a cutting blade 3.
6b has an extremely simple structure, and does not require a power source or power for the cutting blade 36b that vertically cuts the film material F, so there are few failure factors, excellent handleability, reliability, and energy saving, and maintainability. Is also good. Other structures, functions and effects are shown in FIGS.
This is the same as the packaging bag manufacturing apparatus 1 shown in FIG.

[0027]

The present invention has the following effects.

(1) Overlapped with a vertical cutting step of cutting a continuous strip formed by folding a continuous tubular body formed of a flexible film material in its diametrical direction in its longitudinal direction. A sticking step of forming sticking parts, which are formed by sticking the film materials linearly in the width direction of the continuous strip at regular intervals in the longitudinal direction of the continuous strip, and the sticking part in the linear direction thereof. In the method of manufacturing a packaging bag having a horizontal cutting step of cutting along the line, the vertical cutting step,
Waste of film material by being configured by two single-sided cutting steps of cutting only one of the overlapping film materials in the longitudinal direction at two positions sandwiching the continuous strip and separated from each other in the width direction. It is possible to efficiently manufacture a packaging bag with a rib without causing a problem, and it is not necessary to dispose of chips of the film material.

(2) Overlapped with a vertical cutting means for cutting in the longitudinal direction a continuous strip formed by folding a continuous tubular body formed of a flexible film material so as to be crushed in its diameter direction. Adhesive means for forming an adhesive portion in which the film materials are adhered linearly in the width direction of the continuous strip at regular intervals in the longitudinal direction of the continuous strip, and the adhesive portion in the linear direction thereof. In a manufacturing apparatus for a packaging bag, which is provided with a horizontal cutting means for dividing and cutting along the vertical cutting means,
For the packaging described above, the continuous strip is sandwiched and two single-sided cutting means for cutting only one of the overlapping film materials in the longitudinal direction at two positions apart from each other in the width direction are used. It is possible to properly implement the bag manufacturing method, efficiently manufacture ribbed packaging bags without wasting film materials, and eliminate the need to dispose of chips of film materials. is there.

[Brief description of drawings]

FIG. 1 is a partially omitted perspective view showing a packaging bag manufacturing apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a partially omitted perspective view showing a manufacturing apparatus for a packaging bag according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a perspective view showing a packaging bag with ribs.

FIG. 6 is an explanatory view showing a manufacturing process of a conventional packaging bag with ribs.

FIG. 7 is an explanatory view showing a manufacturing process of a conventional packaging bag without ribs.

[Explanation of symbols] 1,31 Packaging bag manufacturing equipment 2 continuous tubular bodies 3 continuous strips 5 Adhesive part 6,36 Vertical cutting means 7 Heat welding cutting means 8a, 8b punching device 9 cutters 10 motors 11 film sensor 12 cutter sensor 13 Position control device 14 Drive shaft 15 Notch 16 breaks 17 punching part 20 packaging bags 21 Vent 22 opening 23 ribs 36a Cutting blade holder 36b cutting blade D diameter direction F film material L longitudinal direction W width direction

Claims (2)

[Claims] 1. A vertical cutting step of cutting in a longitudinal direction a continuous strip formed by folding a continuous tubular body formed of a flexible film material so as to be crushed in a diametrical direction thereof,
An adhering step of forming the adhering portions, in which the overlapping film materials are adhered linearly in the width direction of the continuous strip, at regular intervals in the longitudinal direction of the continuous strip, and the adhering portion thereof. In a method of manufacturing a packaging bag having a horizontal cutting step of cutting along a line direction, the vertical cutting step is performed at two positions apart from each other in the width direction, and only one of the overlapping film materials is respectively cut. Cut in the longitudinal direction 2
A method for manufacturing a packaging bag, which comprises a single-sided cutting process. 2. A vertical cutting means for cutting a continuous strip formed by folding a continuous tubular body made of a flexible film material so as to be crushed in its diametrical direction in its longitudinal direction.
Adhering means for forming the adhering portions, in which the overlapping film materials are adhered linearly in the width direction of the continuous strip, at regular intervals in the longitudinal direction of the continuous strip, and the adhering portion. In a manufacturing apparatus for a packaging bag, which is provided with a horizontal cutting unit that divides and cuts along a line direction, the vertical cutting unit is provided at two positions apart from each other in the width direction, and only one of the overlapping film materials is used. Cut in the longitudinal direction 2
An apparatus for manufacturing a packaging bag, which is configured by one single-sided cutting means.