JPH11268152A - Continuous bag making method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a continuous bag making method in which the number of times of material roll replacement is small and the material cost is low. SOLUTION: A “Σ” shape for allowing the film F to be fed when the film F is fed while applying a folding member to the film F unwound from a single material roll Fr and becoming a packaging bag. The film F has a folded portion F3 formed on both sides of the film F. A folding step C for folding the film F into a substantially cylindrical shape, and a folded substantially cylindrical film F
A welding step D in which predetermined welding portions are pressed together and heated and welded, and the welded film F is cut along a substantially center line in the flow direction of the film F and is orthogonal to the flow direction of the film F. Cut in the direction of
A cutting step E for separating the packaging bags is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous bag-making method for bags having a three-dimensional shape for storing liquids such as beverages and jelly-like beverages.

[0002]

2. Description of the Related Art In recent years, FIG.
A packaging bag (container) having a three-dimensional structure made of a film as shown in FIG. As shown in FIGS. 9A and 9B, such a packaging bag is formed by unwinding and welding respective members from a plurality of material rolls. However, since the film is unwound from a plurality of material rolls, the number of material rolls is large, and the number of times of replacement of the material rolls is also large. Further, as shown by arrows in FIG. 9 (a), in order to form two bags, it is necessary to cut two places, so that chips are generated and the material is wasted. For this reason, the material cost is high, which is uneconomical.

[0003] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a continuous bag making method in which the number of times of exchanging a raw material roll is small and the material cost is low.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment. As shown in FIGS. 1 and 2, a continuous bag making machine for simultaneously producing two packaging bags is provided with an unwinding machine 1, an accumulating device 2, a punching device 3, and a kinking device (folding device) from upstream to downstream. Habit imparting mechanism) 4, folding device 5, heat sealing device 6, and cutting device 7. The unwinding machine 1 of FIG. 1 is equipped with a raw roll Fr on which a wide film F capable of taking two packaging bags in the width direction is wound.
The film F unwound from the material roll Fr of one unwinder 1 is sent between a pair of brake rollers 20. The brake rollers 20, 20 are made of a raw roll F
By stopping the rotation when exchanging r and holding the film F, the supply of the film F to the accumulating device 2 is stopped.

The accumulating device 2 downstream of the braking rollers 20 stores the film F and supplies the film F to the punching device 3.
On the other hand, the accumulating device 2 feeds out the stored film F to the punching device 3 when exchanging the material roll Fr. The accumulation device 2 includes upper and lower rollers 22 and 23 and a lifting frame 2.
One. A plurality of upper and lower rollers 22, 23 are provided downstream of the brake roller 20, respectively, and the film F is stretched over the respective upper and lower rollers 22, 23. The lower roller 23 is fixed to the lifting frame 21. The lifting frame 21 is provided to be able to move up and down by a motor (not shown). The upper and lower rollers 22 and 23 store the film F between the upper and lower rollers 22 and 23 and supply the film F to the hole punching device 3 downstream. On the other hand, when the rotation of the brake roller 20 is stopped during the replacement of the material roll Fr, the lifting frame 21 is raised so that the upper roller 22 and the lower roller 23 approach each other, and the film F
Pay out. That is, the accumulation device 2 enables the storage and unwinding of the film F by changing the distance between the plurality of upper and lower rollers 22 and 23 that hang the film F up and down.

A tension adjusting roller 24 and a tension adjusting device 25 are provided downstream of the accumulation device 2. A tension adjusting device 25 is attached to an end of the tension adjusting roller 24.
Is provided. The tension adjusting device 25 has a potentiometer 25a, detects the tension of the film F based on information from the potentiometer 25a at the time of film exchange, and keeps the film F constant while keeping the film F constant. send.

[0007] The film F is fed to the downstream constant pitch feed roller 3
By means of 0 and 30, the liquid is intermittently transferred to the drilling device 3 at a constant pitch. The punching device 3 has a punch 32.
When the film F passes through the punching device 3, the punch 3
After being punched at a predetermined position by 2, it is sent to the dancer roller 31.

Meanwhile, as shown in FIG. 9C, an aluminum layer F is provided between the resin layer Fj and the adhesive layer Fs.
a of three layers. The adhesive layers Fs are softened at a relatively low temperature, and the films F can be welded to each other by heating and welding the adhesive layers Fs. However, in order to soften the resin layer Fj, it is necessary to make the temperature higher than that of the adhesive layer Fs. Therefore, when three or more films F are welded, the inner film F is cut out and the outer film F is cut. It is necessary to weld the adhesive layers Fs to each other. Drilling by the drilling device 3 is performed for that purpose.

The perforated film F is returned to a constant speed again by a dancer roller 31 which moves up and down in accordance with the feed speed of the film F.
Continuously sent to

The bending habit applying apparatus 4 has a disk-shaped bending haul roller 40 and a guide roller 41. The folding roller 40 is provided with a folding line L at a folded portion where the film F is folded by the folding device 5 described later.
It is provided for attaching. The film F is sandwiched between the folding roller 40 and the guide roller 41, is provided with a plurality of folding lines L parallel to the flow direction of the film F, and is then sent to the folding device 5.

The folding device 5 includes a front folding plate 51, a back folding plate 53, and a folding plate 55, and the folding plates 51, 5 respectively.
Front folding roller 52 and back folding roller 5 corresponding to 3, 55
4 and a folding member such as the folding roller 56. The film F is folded into a predetermined shape by passing between the folding members 51 to 56. That is, as shown in FIG.
_{In A} , the front fold is performed along the fold line L by the front fold plate 51 and the front fold roller 52. The film F _{C on} which the front folding has been performed is folded back along the folding line L by the back folding plate 53 and the back folding roller 54. The film F _{E that} has been folded back is the same folding plate 5
5 and the folding roller 56, the folding of the film F is performed along the folding line L. Thus, the film F _F is folded into a substantially tubular shape, "Σ" shape of the folded portion F3 for allowing the bulge of the packaging bag when became packaging bag is, on both sides of the film F _F It is formed. Here, "substantially cylindrical" means that the films F are not cylindrical because they are in contact with each other at the time of folding, but that when they are inflated, they have a shape close to a cylinder.

The film F _F folded by the folding device 5 is sent to a heat sealing device 6 and is intermittently transferred in the heat sealing device 6.

[0013] The film F _F is the heat sealing device 6, both are pressed against to each other a predetermined welding site is welded by heating. The welding is performed by heating a plurality of times at a predetermined time interval while sending one welding portion downstream. The folded substantially cylindrical film F _F
As shown in FIG. 3, the outwardly bent portions F1 are welded to each other, and in the perforated portion, the outwardly bent portion F2 is passed through the inwardly folded portion F2.
1 are welded together. On the other hand, as shown in FIG. 4B, when the film F is unwound from the accumulation device 2 during the exchange of the film F, the heat sealing device 6 has a longer welding time interval than at the normal time (during normal unwinding). Is controlled to be longer.

[0014] After the welding, the film F _F in FIG. 3 is sent to the cutting device 7. In the cutting apparatus 7, the welded film F _F, together are cut along a substantially central line Xo in the flow direction X of the film F _F, are cut in a direction Y perpendicular to the flow direction X of the film F 1 Subsequently, the packaging bag is cut into the packaging bags b shown in FIG. 3, and two packaging bags are simultaneously formed.

Next, a bag making method of the continuous bag making machine will be described. The film F unwound from the material roll Fr of the unwinder 1 in FIG. 1 is stored in the accumulator 2 and then sent to a hole making step A as shown in FIG. The film F is pierced at a predetermined position by the piercing device 3 in the piercing step A, and is then sent to a folding habit providing step B. In the bending habit applying step B, the bending habit is imparted to the folded portion (FIG. 3) F3 where the film F is to be folded by the bending habit imparting device 4. By performing the folding habit providing step B, a large number of folds can be easily formed at the time of folding.

In the next folding step C, the folding device 5 uses the front folding step C1 and the reverse folding step C2.
And the folding step C3 is performed. Film F
_C passes between the folding members 51 to 56,
The folding steps C1 to C3 are sequentially performed along the folding line L and sent to the welding step D.

The welding process D is a process of welding the predetermined said welding portion between the substantially cylindrical film F _F tucked. The film F _F folded by the folding device 5 is welded at predetermined welding portions by a heat sealing device 6. After the welding, the film F _F is sent to the cutting step E.

In the cutting step E, the film F
_{In this step, F} is cut and cut into individual packaging bags.
Film F _F is by the cutting apparatus 7 is disconnected one by one of the packaging bag b, 2 pieces of the packaging bag b is created at the same time.

As described above, the number of the raw material rolls Fr is reduced to one, and the width of the raw material rolls Fr is increased so that two packaging bags b are simultaneously formed from one sheet.
It is possible to reduce the number of times of replacing the material roll Fr. Therefore, the number of times of joining the film F at the time of exchanging the material roll Fr is reduced, so that the operation efficiency of the continuous bag making machine is increased, and it is economical. Further, since two packaging bags b are cut from one sheet at the same time, the number of parts to be discarded as chips is reduced, so that it is economical and there is a concern about environmental pollution due to the discarded film. Less.

Next, a case where the material roll Fr is replaced will be described. When the material roll Fr is completely unwound, the rotation of the brake roller 20 is stopped, and the film F is pinched. Thus, when the brake is activated,
The elevating frame 21 of the accumulator 2 is raised, and the film F
The distance between the plurality of upper and lower rollers 22 and 23 that vertically hangs the film F becomes shorter, and the film F stored in the accumulator 2 is unwound and supplied downstream. Therefore, even when the film F is replaced, the film F stored in the accumulation device 2 is unwound and supplied downstream.
The film F can be replaced without stopping the continuous bag making machine. For this reason, the operating rate is increased and economical.
It should be noted that the raw material roll Fr is replaced with a new raw material roll Fr.
From the front end of the film F unwound from the front roll F
r and the rear end of the film F unwound from the substrate r.

When the replacement (replacement) of the material roll Fr is completed, the brake roller 20 resumes rotation,
The supply of the film F is started from the changed second material roll Fr. When the supply of the film F is started, the elevating frame 21 starts to descend, the distance between the plurality of upper and lower rollers 22 and 23 over which the film F is vertically extended becomes longer, and the film F is stored in the accumulation device 2. .

By the way, the heat sealing device 6 is always heated, with pressing the predetermined welding portions between the film F _F, it is carried out welding by heating the adhesive layer Fs of the film F _F. However, when the continuous bag-making machine is stopped, the contact of the film F _F disappears, heat sealing device 6 is excessively heated. Therefore, when resuming the operation of the continuous bag-making machine, there is a possibility that the film F _F is deteriorated by high-temperature heat sealing apparatus 6. On the other hand, in the continuous bag making machine, the film F can be replaced without stopping the machine, and the temperature of the welding surface can be maintained at a predetermined temperature.
Temperature control of the film F _F is facilitated. Therefore, there is no possibility that the packaging bag is deteriorated.

By the way, in the continuous bag making machine, when the film F is unwound from the accumulating device 2, as shown in FIG. 4 (b), the interval of the welding time is longer than in the normal state (normal unwinding). Is controlled. That is, the transfer speed of the film F is controlled to be, for example, half of the steady speed. Therefore, the speed of the intermittent transfer to the heat sealing device 6 is also halved. Therefore, as shown in FIG. 4B, the interval P2 of the welding time at the time of replacement is twice the interval P1 of the welding time at the steady state. Interval. Therefore, the film F can be exchanged without stopping the continuous bag making machine, and the raw roll Fr
Since the time for changing the roll can be sufficiently obtained, it is possible to change the material roll Fr.

FIGS. 5 to 7 show a second embodiment. FIG.
The container (b) can also be manufactured as shown in FIGS. The same or corresponding portions as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in FIG. 7, the present continuous bag making machine performs the folding process after the front folding process in the folding process C, and does not require the reverse folding process.

[0025]

As described above, according to the first aspect of the present invention, since the packaging bag is formed from the film unwound from one raw roll, the number of times of replacing the raw roll can be reduced. it can. Further, in the cutting step, only the center of the film is cut and cut into individual packaging bags, and both ends are not cut.

On the other hand, according to the second aspect of the invention, before the folding step, the folding step for forming a plurality of folding lines parallel to the film flow direction is provided, so that the folding step is accurate and easy. Can be folded into

According to the third aspect of the present invention, there is provided an accumulating device which enables storage and unwinding of a film by changing the distance between a plurality of upper and lower rollers for vertically hanging the film. Therefore, even when exchanging the film, the film can be exchanged without stopping the continuous bag making machine.

According to the fourth aspect of the present invention, when the film is fed from the accumulating device, the interval of the welding time is controlled to be long, so that the time for replacing the roll can be sufficiently obtained. The film can be changed without stopping the continuous bag making machine.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of the first half of a continuous bag making machine according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of a rear half of the continuous bag making machine.

FIG. 3 is a cross-sectional view showing a method of folding a film and a plan view of a packaging bag.

FIG. 4A is a process chart showing a continuous bag making method, and FIG. 4B is a chart showing welding intervals.

FIG. 5 is a schematic perspective view of a first half of a continuous bag making machine according to a second embodiment of the present invention.

FIG. 6 is a schematic perspective view of a rear half of the continuous bag making machine.

FIG. 7 is a cross-sectional view showing a method of folding a film and a plan view of a packaging bag.

FIG. 8 is a perspective view showing a packaging bag.

9A and 9B are cross-sectional views showing a conventional packaging bag.
(C) is sectional drawing which shows the laminated structure of a film.

[Description of Signs] 2: Accumulator 22: Upper roller 23: Lower roller 4: Crease imparting device 40: Curl roller 41: Guide roller 51: Folding member 52: Folding member 53: Folding member 54: Folding member 55 : Folding member 56: Folding member b: Packaging bag B: Folding process C: Folding process D: Welding process E: Cutting process F: Film F F3: Folded portion Fr: Raw material roll Fr L: Folding line X : Flow direction Xo: Center line Y: Direction perpendicular to the flow direction

Claims (4)

[Claims] 1. A "Σ" -shaped cover for allowing a swelling of a packaging bag when the film is fed while a folding member is applied to the film unwound from a single web roll. In the state where the folding part is formed on both sides of the film,
And a folding step of folding the film into a substantially cylindrical shape; a welding step of pressing predetermined welded portions of the folded substantially cylindrical film together and heating and welding; and a welding direction of the welded film in a film flow direction. A cutting step of cutting along a substantially center line and cutting in a direction orthogonal to the film flow direction to cut into individual packaging bags. 2. The film flow direction according to claim 1, wherein prior to the folding step, the film is sandwiched between a guide roller and a disk-shaped folding habit roller at a folded portion where the film is folded. A continuous bag making method comprising a folding habit providing step of providing a plurality of folding lines in parallel with the method. 3. The storage and unwinding of a film according to claim 2, wherein a distance between a plurality of upper and lower rollers for vertically hung the film is changed upstream of the kinking mechanism for applying the kinking. A continuous bag making method, comprising: providing an accumulator capable of performing the above-mentioned steps, and raising and lowering the upper and lower rollers of the accumulator so as to approach each other when exchanging a material roll, and feeding the film from the accumulator. 4. The method according to claim 3, wherein the welding is performed by heating a plurality of times at predetermined time intervals while sending one welded portion downstream. The continuous bag making method in which the interval of the welding time is controlled to be long.