JPH05468A - Bag manufacturing method and its device - Google Patents

Abstract

PURPOSE:To manufacture bags with little thermal strain and with large strength of their heat sealing sections by cutting the areas between sealing sections in the position where the heat sealing sections are sufficiently solidified by the natural heat dissipation on the downstream of the heat cylinder position. CONSTITUTION:When a heat sealing section and a discontinuous break section reach the position of a sensor 30, a sensing signal is issued from the sensor 30 and an electromagnetic clutch brake 27 is switched over to the brakes side and a punch conveyor 25 on the upstream side is stopped. As a punch conveyor 26 on the downstream side rotates as it does, tensile force is applied to a processed material belt F1 of the heat sealing section between two units of punch conveyors 25 and 26, and the tensile force is concentrated on the weakest discontinous break, and said break is cut off. Thus respective cut bags are piled up successively on a bag cradle 31 provided on the downstream side of the punch conveyor 26 on the downstream side. When said bags count the given numbers, the bags are carried to a following processing station, if necessary, and adequate processing such as pressure cutting is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has two heat-sealing portions formed by closely approaching two bag material strips made of a synthetic resin flat tube or a double-folded film strip in the transverse direction. The present invention relates to a method and a device for cutting a space into individual bags, and particularly to a bag manufacturing method and a device using a bag material band having a large thermal strain.

[0002]

2. Description of the Related Art Conventionally, when a bag of this type is manufactured, two heat sealing parts which are close to each other are provided at a pitch of one bag in a transverse direction of a bag material band composed of flat tubes having gussets on both sides. Immediately after, cut between the two heat-sealed parts,
We manufacture a bottom-seal type bag with both ends sealed, and then stack a number of these sealed bags and cut out the batch bag part as a bag bag, which was used as a take-away bag for many supermarkets at the time of this application. Widely used (see Fig. 5).

Further, after incising a valley portion of a gusset on one side of a similar bag material strip, two intermediate heat seal portions are formed in the same manner as described above, and at the same time or immediately after that, the middle portion thereof is cut to weld both sides. After forming a bag of a mold (also referred to as a side seal type), a hand bag (usually called a fashion bag) is manufactured by forming a finger hole in the center of the opening of the bag.

There is also known a method in which a bag material band is cut into individual bag sizes before the heat-sealing portion is formed, and the heat-sealing portion is formed at the edge of the bag material band.

However, at the same time as the heat-sealing or before the heat-sealing portion is sufficiently cooled, the vicinity thereof is cut, or the end portion of the heat-sealed portion is heat-sealed after cutting to form a bag. When the seal portion cools, heat shrinkage or large distortion occurs, and since this is the end of the bag, the bag is largely distorted and the appearance becomes bad.

Particularly, in the case of a bag material band having a poor heat dissipation property, or in the case of a polyethylene film having a low density (LD) on the front side and a high density (HD) on the inner surface, it takes a long time to cool and solidify. Since the heat-sealed parts of the above will be welded to each other, various anti-welding devices have already been announced, and devices equipped with these devices can also be seen in the market, but the structure of the device is complicated and it only increases the bag manufacturing cost. Moreover, even if these devices are attached, sufficient distortion or mutual fusion during cooling cannot be prevented.

On the other hand, a device for pressing a cooling water pipe or a cooling box against a heat seal portion in order to shorten the cooling time or prevent the occurrence of thermal strain has been announced, but the thermal strain can be prevented. Has a drawback that the welding strength and its peeling strength are lowered.

[0008]

DISCLOSURE OF THE INVENTION The present invention focuses on the fact that when the heat seal portion is not at the edge of the bag but in the middle of the bag material band, the heat distortion during natural cooling is small, and the cooling portion is completely Developed a bag-making method and device based on a method that does not divide into individual bags until it solidifies, and by this method, a bag body with little heat distortion and high strength of the heat-sealing portion is efficiently and The device for carrying out the method is also intended to be a complex mechanism.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned objects, a thermoplastic flat tube (including a gusset on both sides) and a bag material band made of one of two folded film bands are sequentially arranged in the longitudinal direction. During transportation, two or more film strips overlapping the bag material strips are melted by two heat sealers in the transverse direction which are close to each other, and the two heat-sealed portions are sequentially arranged at one bag pitch. At the position where the heat seal portion downstream of the heat sealer position is sufficiently solidified by natural heat dissipation, the adjacent seal portions are divided in the transverse direction of the bag material band, and individual bag bodies are sequentially cut. A bag-making method characterized by manufacturing.

In order to achieve the above object, in the bag making method of the present invention, when two heat seal portions are formed by the heat sealer, at the same time or in the next station, between the two heat seal portions. A discontinuous cut parallel to these is formed by a discontinuous cutter, and at the position where the seal portion is solidified, a tensile force in the length direction of the bag material band is applied to the discontinuous cut portion to form this discontinuous cut. It is preferable that the method is a method of slanting.

In order to achieve the above object, the bag making method of the present invention may be characterized by a method of cutting with a cutter at the position where the heat seal portion is solidified.

In order to achieve the above object, the bag-making method of the present invention may be characterized in that the cutter is heated to a temperature sufficient to soften or melt the bag material band.

In order to achieve the above object, according to the present invention, the bag material strip conveyed by the conveying means is held between the upstream side of the pair of holding type intermittent conveying means in the transverse direction of the bag material strip. The heat sealer having a heat sealer having two sealing surfaces forming two close heat seal portions and a discontinuous cutter having a discontinuous cut in the middle thereof is provided on the downstream side of the heat seal portion processing apparatus. Between the heat sealer and the upstream pinch conveyor, two sets of pinch conveyors for sandwiching and transporting the heat-sealed material strips sent out from the seal part processing device are sequentially provided in the machine frame at intervals slightly shorter than one bag length. The length of the transport path of the processed material band of the heat seal part of
The heat seal formed by the heat sealer has a length sufficient for spontaneous heat radiation and solidification, and the pinch conveyor on the downstream side of the two sets of pinch conveyors is connected to a forced drive source corresponding to the bag making speed. , The upstream side pinch conveyor is connected to the downstream side pinch conveyor at the same speed and a variable drive source that is momentarily slower or stopped than this, and on the other hand, in a part of the bag material belt transport path, A detection sensor for detecting a seal portion or a discontinuous cut formed by the welding device is provided between the two sets of pinch conveyors or in the vicinity of a conveyor furnace for the heat-sealed material strip on the upstream side thereof. , The variable speed drive source of the upstream pinch conveyor is momentarily stopped or becomes low speed,
The bag making apparatus is provided with a control circuit for returning to a normal speed after a while.

In order to achieve the above object, the pinch conveyor on the upstream side of the bag making apparatus of the present invention is connected to an electric rotary motor via an electromagnetic clutch brake, and a clutch is usually connected. It is preferable that the brake is separated, the clutch is disengaged by the detection signal of the detection sensor, the brake is operated, and the electromagnetic clutch brake is restored to its original state after a while.

Further, in order to achieve the above object, the upstream pinch conveyor of the bag making apparatus of the present invention is connected to a servomotor, and the upstream pinch roller is usually at the same peripheral speed as the downstream pinch conveyor. As the rotation, it is preferable that a control device is configured so that the servo motor is stopped or becomes a low speed by a detection signal of the detection sensor, and is temporarily returned to an original speed. Further, in order to achieve the above-mentioned object, the upstream pinch conveyor of the bag manufacturing method with less heat distortion of the heat-sealed portion of the present invention also serves as the transfer device, and is driven by a servomotor. It is preferable that

In order to achieve the above-mentioned object, a pair of heat sealers having two sealing surfaces close to each other and a pair of paired gripping type conveying rolls, which are driven by a servomotor, are provided downstream of a heat seal portion processing apparatus. A holding type pinch conveyor is provided, and the length of the transport path of the heat seal part processed bag material band from this sealer to the pinch conveyor is sufficient for the heat seal part formed by the heat sealer to naturally radiate and solidify. It has a length, immediately downstream of the pair of pinch conveyor pinch conveyor, is provided with a cutter that operates in synchronization with the heat sealer, the cutter is connected to the vertical drive means, in a predetermined time cycle, The output signal of the start detection sensor, which is provided to repeat the operation and non-operation, and detects the non-operation start of each of the cutters, is the start signal of the servo motor. As a signal, the heat seal part detection sensor is provided in the vicinity of the cutter position or the heat seal processed material strip conveying path upstream thereof, and the detection signal of the heat seal part detection sensor is a stop command signal of the servo motor. Is characterized in that a control circuit of the servo motor is configured.

In order to achieve the above object, the heat distortion of the heat-sealed portion is reduced, and the cutter of the bag making apparatus is one of a pair of scissor-type cutter traveling cutters. It is preferable.

In order to achieve the above object, it is preferable that the cutter of the bag making apparatus according to the present invention is a cutter capable of heating the material band having the heat-sealed portion processed to soften or melt. .

[0019]

The operation of the apparatus invention according to claims 5 to 11 will be explained together with the method invention according to claims 1 to 4.

First, the operation of the apparatus inventions of claims 5 to 8 and the method of claims 1 and 2 will be described. The apparatus according to any one of claims 5 to 8, wherein the original fabric supporting device is caused to support the original fabric material band by the original fabric material supporting device, and the continuous bag material belt is passed through the heat sealer portion and the discontinuous cutter portion, and further. Pass between two sets of pinch conveyors on the downstream side.

When the entire apparatus is operated, the bag material band is intermittently conveyed by the length of one bag by the intermittent conveying means, and the two seal portions of the heat seal processing device are activated at each stop. With the heat sealer, the bag material band is welded in the transverse direction to form two heat seal parts that are close to each other, and at the same time, a discontinuous cut is formed between the two heat seal parts in parallel by the discontinuous cutter. To be done.

The heat-sealing portions are naturally dissipated in the course of being sequentially conveyed, and the two heat-sealing portions tend to shrink in the width direction of the bag material band during the solidification thereof.
Since both sides of the heat-sealing portion are connected to each other by the bag material band, their rigidity prevents heat shrinkage and completes the solidification in almost the same form.

When the heat seal portion reaches between the pair of pinch conveyors, the heat seal portion detection sensor outputs a detection signal to stop or lower the speed of the upstream pinch conveyor. However, since the pinch roller on the downstream side maintains the normal conveying speed, tensile force acts on the heat-sealed material strip between the two pairs of pinch conveyors, and the weakest of the heat-sealed material strips is applied. This heat-sealed material strip is cut from the discontinuous cut. Each of the pieces divided on the downstream side of this becomes a single bag.

The upstream pinch conveyor is temporarily stopped (until the division is completed), and then restarts rotation again, and the leading end of the bag material band is again held by the downstream pinch roller.

According to the sixth aspect of the present invention, the clutch brake is normally coupled to the clutch side by the detection signal from the detection sensor, the upstream pinch conveyor is stopped at a very low speed or stopped, and then the electromagnetic clutch brake is again engaged. It will be connected to the side and will return to normal operation.

According to the seventh aspect of the present invention, the control signal for the servomotor is actuated by the detection signal from the detection sensor, the servomotor itself is stopped at an extremely low speed or stopped, and then the normal operation speed is restored again.

In the apparatus invention according to the eighth aspect, the bag material band and the heat-sealed portion-processed transfer means connected to the bag material band are the upstream pinch conveyors, and the operating rotation angle at this time is just one bag length. It is designed to be.

Next, the operation of the device invention according to claims 9 to 11 will be described. In the apparatus described in claims 9 to 11, unlike the invention described in claims 5 to 8, first, the number of operating cycles of the heat sealer and the cutter within a predetermined time is determined.

Further, when the servo motor and the pinch roller are stopped by the detection signal of the heat-sealing portion detection sensor, the position of the heat-sealing portion detection sensor is set in advance so that the middle of the two heat-sealing portions approaching each other will be the cutting position by the cutter. The length of the conveyance path between the cutter and the position of the cutter is adjusted, and when this device is operated, the bag material belt is conveyed by one bag length each time this is inactive, and the heat seal part processing device approaches it. Only two heat-sealed parts are machined and no discontinuous cuts are made.

In the pinch conveyor part, the servomotor starts to rotate by the detection signal of the start detection sensor that detects the non-operation start of the cutter, conveys the one-bag length heat-sealed material strip, and the next heat The seal portion is detected by the heat seal portion detection sensor, and the pinch conveyor is stopped by this detection signal.

The stop position of the material band having the heat-sealed portion processed by the stop of the servo motor is a position where the thin portion sandwiched by the two heat-sealed portions is just cut by the cutter. Therefore, the cutter is used to cut the heat-sealed material strip between the two heat-sealing portions each time.

When the cutter according to claim 10 is a pair of scissors, when the pinch conveyor stops, the cutter reciprocates, and when the cutter is a traveling type, when the pinch conveyor stops, the width direction of the bag material band. The cutter runs to cut the bag material strip in the transverse direction. The cuts are straight in these cuts.

When the cutter of claim 11 is a heating cutter, when the bag material band is cut with the cutter, the bag material band is cut while being softened or melted by the heating cutter at the same time as cutting at the edge. At that time, the cut ends become straight and smooth.

[0034]

Embodiments of the present invention will now be described. Example 1 An apparatus for carrying out the method of claims 1 and 2, and examples of claims 5 and 8 will be described with reference to FIG.

In FIG. 1, 10 is an original fabric supporting device for supporting the bag material band F wound in a roll shape.
An intermittent transfer device 20 including a pair of holding type transfer rolls (including a belt conveyor) 21, which is a kind of transfer device for intermittently transferring one bag length, is provided in a machine frame 40. In the bag material band transfer path between the original fabric support device 10 and the intermittent transfer device 20, a pair of jaws that holds and separates the bag material band F from both sides of the bag transfer device 20 each time the intermittent transfer device 20 is stopped. 12, 1
A welding device 11 of 5 is provided.

One of the jaws 12 of the welding device 11 has two sealing surfaces 12 that are close to each other and extends in the transverse direction of the bag material band F, and comprises a heat sealer 13. The two sealing surfaces 1
There is a discontinuous cutter relief groove 14 between the two. The other jaw 15 is a heat sealer pedestal, and is provided with a sawtooth-shaped discontinuous cut cutter 16 protruding and retracted from the pedestal surface. When the pair of jaws 12 and 15 are in phase contact with each other, the discontinuous cut cutter 16 Is projected from the buried position below the surface of the heat sealer pedestal 15 and the tip of this discontinuous cut cutter 16 is inserted into the discontinuous cutter escape groove 14 of another jaw 12,
It will be immersed in the chin 15 again.

As described above, the entire apparatus from the original fabric supporting device 10 to the intermittent transfer device 20 is the heat seal portion processing device A.

Two pairs of pinch conveyors (including pinch rolls) 25, 26 are provided in sequence on the downstream side of the above-described heat-sealing portion processing apparatus A, and these two pairs of pinch conveyors 25, 26 are provided. The interval is provided in the machine frame 40 as a dimension shorter than one bag length L of the bag body B to be manufactured. Further, the length of the conveying path of the bag material band F between the welding device 11 and the upstream pinch conveyor 25 is set to a dimension such that the heat seal portion is sufficiently cooled and solidified, and is usually 5 to 10 bags.

Of the two sets of pinch conveyors 25 and 26, the upstream pinch conveyor 25 is connected to an electric rotary motor 28 via an electromagnetic clutch brake 27, and the downstream pinch conveyor 26 is the rotary motor. Two
8 are directly connected to each other via an appropriate transmission means, and the peripheral speeds of the two sets of pinch conveyors 25 and 26 when driven are the same, and the peripheral speed of the transfer roll 21 of the intermittent transfer device 20 is almost the same. There is. Two sets of pinch conveyor 2
It is preferable to provide a receiving belt conveyor 29 that moves a little faster than the peripheral speed between 5 and 26, but the pinch conveyor on the upstream side is on the upper side, and the pinch roller 26 on the downstream side is on the downstream side. These receiving conveyors 29 are not particularly required when the conveying direction is downward.

Numeral 30 designates two sets of flow side pinch conveyors 25.
Between 26 or at a position one bag length upstream from this, there is provided a heat seal portion detection sensor for detecting the heat seal portion B1 of the heat-sealed material strip F1 to be conveyed, and normally the position is It is provided on the machine frame 40 so as to be movable and fixed along the heat-sealed material strip. The heat seal part detection sensor 30
A control device C is provided for switching the electromagnetic clutch brake 27 from the clutch side to the brake side in accordance with the detection signal, temporarily stopping the upstream pinch conveyor 25, and then returning the electromagnetic clutch brake 27 to the original state. .

The above-mentioned heat-sealing portion detecting sensor 30 directly detects the heat-sealing portion B1 and a detection mark (also called a register mark) on the bag material band F displayed at a pitch corresponding to the heat-sealing portion B1. It goes without saying that a part of a character or a pattern is detected.

Operation of Embodiment 1 In order to operate the apparatus of Embodiment 1, the material web supporting device 10 is made to support the bag material band F, and the tip of this is passed between the pedestal 15 of the welding device 11 and the heat sealer 13, Transport roll 21
Through the pinch conveyor 25 on the further upstream side,
Thus, all the equipment is operated.

First, the bag material band F is intermittently conveyed by the conveying roll 21 one bag length at a time, and the heat sealer 13 is stopped by the pedestal 15 every time the bag material band F is stopped.
Is pressed against the pedestal 15, and the bag material band F is heat-sealed in the cross direction by the two sealing surfaces 12 that are close to each other in the cross direction, and at the same time, the sawtooth-shaped discontinuous cutter 16 is lifted and the bag material band is cut. Between F and the sealing surface 12 of the two lines,
Each of the tips of the saw teeth of the discontinuous cutter 16 has a bag material band F.
The heat sealer 13 rises and the discontinuous cut cutter 16 retracts downward.

Therefore, in the bag material band F, two heat seal portions B1 that are extremely close to each other at a bag length pitch and a discontinuous cut B2 are formed between them, and the heat seal portion processed material band F is formed.
1 is sent out by the conveying roll 21, is further conveyed by the upstream pinch conveyor 25 in sequence, and the leading end thereof is held by the downstream pinch conveyor 26, and between the two sets of pinch conveyors 25 and 26, the bag material band F
Is supported by a receiving belt conveyor 29, is conveyed without being loosened, and is also held and conveyed by the downstream pinch conveyor 26 in sequence.

In this way, when the heat seal portion B1 and the discontinuous cut portion B2 reach the position of the detection sensor 30, the detection sensor 30 emits a detection signal and the electromagnetic clutch brake 2
7 is switched to the flexure side, upstream pinch conveyor 25
However, since the downstream pinch conveyor 26 is still rotating, a tensile force acts on the heat-sealed material strip F1 between the two sets of pinch conveyors 25, 26, and the weakest discontinuous cut B2. The pulling force concentrates on and is cut and cut (see Fig. 4).

The individual bag bodies B3 that have been divided are sequentially stacked on the bag group receiving table 31 provided on the downstream side of the pinch conveyor 26 on the downstream side. When the number of bags reaches a predetermined number in these bags, they are transported to the next processing station as necessary and subjected to appropriate processing such as stamping.

Embodiment 2 (see FIG. 2) Embodiment 2 is an apparatus for carrying out the method invention of claim 1 and is an embodiment of the apparatus invention of claims 9 and 10.

The difference from the first embodiment is that the welding device 11
There is no discontinuous cut cutter, and there is provided a heat sealer 13 for simply forming two heat seal portions B1 that are close to each other.

Further, only one set of the pinch conveyors 25 provided on the downstream side of the heat-sealing portion processing apparatus A is provided. This pinch conveyor is connected to the secondary side of the electromagnetic clutch brake 27 connected to the rotary motor 28, and the detection signal of the detection sensor 30 causes the clutch of the electromagnetic clutch brake 27 to be disengaged and the brake to be actuated. 25 is temporarily stopped, and the cutter 36 of the cutting device 35 provided immediately downstream of the pinch conveyor 25 is operated during the stop, and the heat-sealed material strip F1 is cut into individual bags B3 in sequence. When the cutting is completed, the electromagnetic clutch brake returns to the original state, and the transport of the heat-sealed material strip F1 is restarted.

Prior to the operation of the second embodiment, the detection sensor 3
When the pinch conveyor 25 is stopped by the detection signal of 0, the middle of the two heat seal portions B1 that are close to each other and are formed on the heat-sealed material strip F1 is located at the position of the cutter 36 of the cutting device 35. As a matter of course, the position of the detection sensor 30 or the length of the transport path of the heat-sealed portion processed material strip F1 from the detection sensor 30 to the cutting device 35 may be adjusted by changing the position of the guide roll 39. is there.

Also in this embodiment, the detection sensor 30
Is included in this embodiment even if the heat-sealed portion B1 or a mark corresponding to the heat-sealed portion B1 is detected.

When the cutter 36 has heated the processed material strip F1 to such an extent that it softens or melts, the cutting end softens or melts during cutting by the cutter 36.

In Embodiments 1 and 2, the electromagnetic clutch brake 27 and the ordinary transmission motor 28 are not used, but instead of this, the speed of the upstream pinch conveyor 25 is directly controlled by the servo motor (including stepping motor and pulse motor) 28a. Even if it is configured to perform control so that the cutting position is adjusted by the cutter 36, it is included in these examples.

In these first and second embodiments, the intermittent transfer device 20 is provided with a pair of holding type transfer rolls 21 shown in FIG.
Immediately downstream of the receiving the heat sealant material band F1,
It is preferable to provide an auxiliary receiving conveyor 23 that conveys at a speed higher than the peripheral speed of the conveying roll 21 so that the tensile force does not act on the heat seal portion B1. At this time, a slackening portion 24 for slackening the heat-sealed material strip F is provided between the auxiliary receiving conveyor 23 and the pinch conveyor 25 on the downstream side.

In this way, the bag material band F is fed to the welding device 11 by the transport roll 21 on the upstream side, and the auxiliary receiving conveyor 2 on the downstream side of the welding device 11.
3 simply conveys the heat-sealed material strip F1 by friction, so that an excessive tensile force is applied to the heat-sealed portion B1.
It is conveyed without forming wrinkles.

Embodiment 3 (see FIG. 3) An apparatus for carrying out the method invention of claim 1, which is an embodiment of claims 9 to 11, is shown in FIG.

Further, the heat sealer 13 and the cutter 36 are connected to a common vertical movement driving means 38 to synchronously move them up and down or by a common vertical movement command signal, respectively provided vertical movement driving means such as an air cylinder device. Are operated almost at the same time, and can be arbitrarily set to move up and down 40 to 250 times at a constant time interval, for example, 1 minute. This heat sealer 13 or cutter 36
The output signal of the second detection sensor 32 for detecting the separation of the servo motor is the starting signal for each servo motor 28a.

As in the second embodiment, the detection signal of the detection sensor 30 is a stop signal for the servo motor 28a. The same applies to the one that detects the heat seal portion B1 and other marks.

When the apparatus of the third embodiment configured as described above is operated, the heat-sealed material strip F1 sent out from the heat-sealing portion processing apparatus is detected by the detection sensor 31 when the cutter 36 is inactive each time. Servo motor 28 by signal
a starts rotating, the servo motor 28a is stopped by the detection of the detection sensor 30, and the cutter 36 cuts between the two heat-sealed portions.

In the second and third embodiments, there may be a case where an appropriate conveying means for conveying the group of bags to the next processing or processing station is added on the downstream side of the cutting device.

In each of the other embodiments, a pinch conveyor 37 for conveying the bag material band F is also provided on the upstream side of the welding device as shown in FIGS. 1 and 3, and excessive pulling is applied to the heat seal portion B1 in the softened state. It may prevent force from acting.

[0062]

According to the method of the present invention, the two heat-sealed portions are sequentially formed in the middle portion of the bag material strip in the transverse direction, and after these heat-sealed portions are sufficiently solidified by natural heat radiation, Since the middle of the two heat seal parts is divided, when the heat seal part is solidified, the bag material band remains continuous on the upstream side and the downstream side, so that distortion due to heat shrinkage does not occur, and it is divided later. The result is very little distortion of the individual bags afterwards.

In the second aspect of the invention, since the cutting method inserts the discontinuous cut at the same time when the heat seal portion is formed and cuts it off, the positional relationship between the heat seal portion and the cut edge is always accurate. .

In the inventions according to claims 3 and 4, since the cutting edge is cut by a cutter, the cutting edge is straight and beautiful, and in the method according to claim 4, the cutting edge is smooth and fusing In this case, the ends of the individual bags form a seal between the heat seal portion and the fusing edge, and the seal is strong and beautiful.

The apparatus according to claims 5 to 7 can carry out the method of claim 2 and has the same effect as the effect of the method invention of claim 2.

According to the apparatus inventions of claims 9 and 11, the method invention of claim 3 can be implemented.

Further, once the relative positional relationship between the heat-sealing portion detection sensor and the cutter is adjusted in consideration of the stop time lag of the servo motor, etc., the cutting can be performed accurately by the cutter.

In the apparatus invention according to claim 11, the method invention according to claim 4 can be implemented.

Further, in the apparatus according to the ninth to eleventh aspects, a sufficient time can be taken for forming the hot roll portion, and only the carrying time can be shortened.

The effects of the embodiments can be obtained by combining the effects of the corresponding claims.

[Brief description of drawings]

FIG. 1 is a side view of a mechanism according to a first embodiment.

FIG. 2 is a side view of the mechanism of the second embodiment.

FIG. 3 is a side view of the mechanism of the third embodiment.

FIG. 4 is a perspective view showing a manufacturing process of a bag body manufactured by this method.

FIG. 5 is a perspective view showing an example of a bag body.

FIG. 6 is a perspective view showing a final step partial manufacturing step of another bag body manufactured by this method.

FIG. 7 is a side view of the mechanism of another embodiment of the transport device.

[Explanation of symbols]

10 Original support device 13 heat sealer 21 Conveyor roll 25 upstream pinch roller 26 Downstream pinch roller F bag material belt F1 heat seal part processed material band B1 heat seal part B2 discontinuous cut B3 bag

Claims (11)

[Claims] 1. A thermoplastic flat tube (including a gusset on both sides) and a bag material strip made of one of two folded film strips are sequentially conveyed in the length direction, and in the course of the conveyance, crossing close to each other is carried out. Two heat sealers in the same direction are used to weld two or more film strips where the bag material strips are overlapped, and two heat seal portions are sequentially formed at a pitch of one bag. At the position where the seal part is sufficiently solidified by natural heat dissipation, the close seal parts are divided in the transverse direction of the bag material band,
A bag manufacturing method characterized in that individual bags are sequentially manufactured. 2. The dividing method is such that, when two heat-sealing portions are formed by the heat sealer, a discontinuous cut parallel to the two heat-sealing portions is formed at the same time or at the next station between the two heat-sealing portions. Formed by a continuous cutter, at the position where the seal portion is solidified, the discontinuous cut portion, by applying a tensile force in the length direction of the bag material band, is a method of pulling the discontinuous cut Claim 1
The described bag making method. 3. The bag making method according to claim 1, wherein the dividing method is a method of cutting with a cutter at a position where the heat seal portion is solidified. 4. The bag making method according to claim 3, wherein the dividing method is a method in which a cutter is heated to a temperature sufficient to soften or melt the bag material band. 5. An upstream side of the pair of holding type intermittent transfer means,
Hold the bag material belt conveyed by this conveying means,
Heat seal part processing device provided with a heat sealer having two sealing surfaces forming two close heat seal parts in the transverse direction of the bag material band and a discontinuous cutter punching a discontinuous cut in the middle On the downstream side of, two sets of pinch conveyors for sandwiching and transporting the heat-sealed material strip sent out from the heat-sealing part processing device are sequentially provided in the machine frame at intervals slightly shorter than one bag length, The heat seal part between the heat sealer part and the upstream pinch conveyor has a length of a conveying path of the processed material strip that is long enough for the heat seal part formed by the heat sealer to spontaneously heat-radiate and solidify. Among the conveyors, the pinch conveyor on the downstream side is connected to the forced drive source corresponding to the bag making speed, and the pinch conveyor on the upstream side has the same speed as the downstream pinch conveyor, and a momentary speed higher than this. Is connected to a variable drive source that slows or stops at a relatively low speed, and on the other hand, a detection sensor for detecting a seal portion or a discontinuous cut formed by a welding device is provided in a part of the conveyance path of the bag material band. It is provided between the pinch conveyors or in the vicinity of the conveying furnace of the heat-sealed material strip on the upstream side thereof, and the variable speed drive source of the upstream pinch conveyor is momentarily stopped or A bag-making apparatus, which is provided with a control circuit that reduces the speed to a normal speed after a while. 6. The pinch conveyor on the upstream side is connected to an electric rotary motor via an electromagnetic clutch brake, the clutch is normally engaged, and the brake is separated, and the detection signal of the detection sensor is used. The clutch is disengaged, the brake is operated, and the electromagnetic clutch brake is restored to its original state after a while.
The bag making apparatus according to the item. 7. The upstream pinch conveyor is connected to a servomotor, and the upstream pinch roller normally rotates at the same peripheral speed as the downstream pinch conveyor, and the servomotor is detected by the detection signal of the detection sensor. 6. The bag making apparatus according to claim 5, wherein a control device is configured to stop or reduce the speed and return to the original speed after a while. 8. The bag making apparatus according to claim 5, wherein the upstream side pinch conveyor also serves as the conveying means, and is driven by a servo motor. 9. A pair of pinching conveyors driven by a servomotor is provided on the downstream side of a heat sealer processing device having a heat sealer having two sealing surfaces close to each other and a pair of pinching type conveying rolls. The length of the conveying path of the heat-sealed portion processed bag material strip from the sealer to the pinch conveyor is sufficiently long for the heat-sealed portion formed by the heat sealer to spontaneously heat and solidify. A cutter that operates in synchronization with the heat sealer is provided immediately downstream of the pinch type pinch conveyor.
The cutter is connected to an up-and-down driving means and is provided to repeat operation and non-operation in a predetermined time cycle. An output signal of a start detection sensor for detecting each non-operation start of the cutter is the start of the servo motor. As a command signal, the heat-sealing portion detection sensor is provided in the vicinity of the cutter position or the upstream side of the heat-sealing processed material belt conveying path, and the detection signal of the heat-sealing portion detection sensor is a stop command for the servomotor. A bag-making device characterized in that a servomotor control circuit is configured as a signal. 10. The bag manufacturing apparatus according to claim 9, wherein the cutter is one of a pair of scissor-type cutter traveling cutters. 11. The bag manufacturing apparatus according to claim 9, wherein the cutter is a cutter capable of heating the material band having the heat-sealed portion processed to soften or melt the material band.