JPH0939919A - Longitudinal sealing apparatus in bag making, filling and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform extremely favorable film seal by increasing thermal efficiency, reducing electric energy required and obtaining an optimum and stable seal temperature. SOLUTION: Each heating means 32 is disposed, with the aid of a mounting plate 46 in a non-contact state, at an upper end of each support cylinder rotatably supporting therein a rotary drive shaft 42 for a sealing roller 28. The heating means 32 has an induction coil 48 generating a low-frequency electromagnetic beam by allowing a low-frequency current to flow through a cylindrical casing 56. The heating means 32 is positioned in the vicinity of a lower disc face of a disc roller 62 provided with the sealing roller 28 on the upper face thereof and disposed so as to be rotatable unitarilly with the rotary drive shaft 42 with the aid of a shaft portion 62a. A seal temperature measured by each temperature detecting means 86 disposed under the sealing roller 28 is inputted into a temperature controlling means which compares the measured seal temperature with a desired seal temperature and controls the heating means 32 to be actuated so that both the temperatures coincide with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-making filling and packaging machine for sealing a film by sandwiching a longitudinally overlapping end portion of a cylindrically formed packaging film with a sealing roller which is positively driven. The present invention relates to a vertical sealing device.

[0002]

2. Description of the Related Art Conventionally, in a bag-making filling and packaging machine, for example, as a vertical sealing device for vertically sealing a longitudinal overlapping edge portion along a feeding direction of a packaging film, for example, Japanese Utility Model Laid-Open No. 51-970.
As disclosed in Japanese Patent Laid-Open No. 75-75, one in which a heater is incorporated in a heating roller connected to a pair of seal rollers which sandwiches a film and is driven to rotate, and Japanese Utility Model Laid-Open No. 52-1188.
As disclosed in Japanese Patent No. 759, there is a technique in which a heater is provided in the seal roller itself.

In the above-mentioned prior art, since the heater incorporated in the heating roller or the seal roller rotates integrally with the seal roller, it is necessary to provide a brush ring in the power supply portion of the heater, which causes abrasion of the brush contact and Power problems often occurred due to poor contact. In addition, since the heating method is based on heat conduction from a heater integrated with the seal roller, the temperature difference between the heating source temperature and the film sealing surface of the seal roller is large due to heat loss, and the seal roller seals the film. It took time to reach the required temperature.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 63-46308, it has been proposed to provide a fixed heating means in the vicinity of the disk surface of the seal roller so as not to rotate integrally with the seal roller. In the vertical sealing device having this configuration, it is not necessary to provide a brush ring in the power feeding portion of the heating means, and power troubles can be prevented. However, since the method of indirectly heating the seal roller, in which the heating means is arranged in proximity, by radiant heat is adopted, the heat loss is larger than that of the above-described structure in which the heater is integrally provided in the seal roller, and the seal roller is There was an inherent problem that it took more time to heat the to the optimum sealing temperature. Although it is possible to shorten the heating time by using a heating means that consumes a large amount of power, in that case, the manufacturing cost and running cost increase.

A technique disclosed in Japanese Utility Model Laid-Open No. 6-86921 discloses a technique which can solve the problems inherent in the above-mentioned various conventional techniques. This device is configured such that a heating unit accommodating an induction coil that generates high-frequency electromagnetic radiation is fixedly arranged near the outer peripheral surface of the seal roller, and the seal roller is directly heated by induction heating. That is,
Since the seal roller is directly heated by the high frequency induction heating method, the heating time from the start of heating to the target temperature can be shortened, and the heat loss mentioned above is also improved.

[0006]

However, in the above-mentioned vertical sealing device of the high frequency induction heating system, the outer peripheral surface (film sealing surface) of the constantly rotating sealing roller is separated from the film sandwiching portion by approximately half the circumference. Since the heating section is provided, heat is diffused by the air-cooling action accompanying the rotation of the roller, and it is expected that the temperature of the film sandwiching section will drop. Therefore, it is necessary to heat the seal roller to a temperature higher than the target temperature in advance in anticipation of the temperature decrease so that the film sealing surface during rotation of the seal roller will reach the optimum target temperature for sealing, and efficient heating is achieved. However, it is pointed out that the power consumption increases.

Further, since the high frequency induction heating system is adopted, it is necessary to additionally provide a cycle converter such as an inverter for changing the cycle from several kilohertz to several tens of kilohertz, which is a drawback that the manufacturing cost increases.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned various drawbacks inherent in the vertical sealing device, and to improve the thermal efficiency and to reduce the required power amount. It is an object of the present invention to provide a vertical sealing device in a bag-making filling and packaging machine capable of reducing the temperature and obtaining an optimum and stable sealing temperature, which enables extremely excellent film sealing.

[0009]

[Means for Solving the Problems] Overcoming the above-mentioned problems,
In order to achieve the intended purpose, the present invention is a vertical sealing device for performing a vertical seal on a polymerized edge portion extending in the feeding direction of a tubular film, the polymerized edge of the tubular film. A pair of seal rollers disposed opposite to each other sandwiching the portion, and sandwiching the film and rotating in opposite directions;
One of the seal rollers or the disc rollers, which is indirectly connected to each of the seal rollers directly or via a disc roller removably attached to the roller, and which drives the seal roller to rotate. And a heating means comprising a cylindrical casing provided with an induction coil for generating electromagnetic waves of low frequency, the heating means being fixedly arranged in proximity to the disk surface of each of the rotary drive shafts. It is characterized in that it is rotatably inserted in the casing in a state where it coincides with the central axis of the casing.

[0010]

The overlapping edge portion of the tubular film is fed to the downstream side by a pair of seal rollers which sandwich the edge portion. When a low-frequency current is passed through the induction coil of the heating means arranged in proximity to one disk surface of each seal roller or the disk roller to which the seal roller is detachably attached, an eddy current is generated in the seal roller. The entire film sealing surface of the roller is heated in a short time. Therefore, the overlapping edge portion which is sandwiched between the pair of seal rollers and is fed to the downstream side is heat-sealed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vertical sealing device in a bag-making filling and packaging machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. In the examples, a horizontal bag-making filling and packaging machine will be described as an example of a packaging machine in which a vertical sealing device is adopted, but the present invention is not limited to this, and a vertical bag-making filling and packaging machine can be used. Can also be applied.

As shown in FIG. 1, a horizontal bag-making filling and packaging machine 10 according to an embodiment has an object 14 to be packaged and an attachment 14 to be packaged.
A conveyor 16 for feeding downstream by a predetermined interval
It has. On the downstream side of the supply conveyor 16, a bag-making device 24 for forming a film 22 fed from the supply roll 20 by a pair of feeding rollers 18 into a tubular shape is arranged, and is supplied from the supply conveyor 16 to be packaged. Thing 1
2 is filled in a film 22 formed into a cylinder. Further, the overlapped edge portion 22 in the longitudinal direction of the tubular film 22
A pair of feed rollers 26, 26 (only one of which is shown) are arranged on both sides sandwiching a, and the tubular film 22 is fed by the feed rollers 26, 26.

A pair of seal rollers (vertical sealers) 28, 28 are provided on the downstream side of the feed rollers 26, 26 via a supporting mechanism (described later) shown in FIGS.
The rollers 28 are arranged so as to sandwich each other, and each roller 28 is heated to a required temperature by a heating means 32 of a low frequency induction heating system described later. Then, in a state where the seal rollers 28, 28 are heated to the target seal temperature (appropriate heating temperature) via the heating means 32, 32 controlled by the temperature control means 34 shown in FIG.
A center seal (vertical seal) is provided by pressing and heating the overlapping edge portion 22a by means of No. 8.

Further, a pair of seal bodies (end sealers) 30 and 30 which are vertically opposed to each other with a horizontal film feeding path interposed therebetween are disposed further downstream of the seal rollers 28, 28, and each seal body 30 is the above-mentioned one. A heater (not shown) whose temperature is adjusted through the temperature control means 34 is built in. Then, while the heater is heated to the target seal temperature, an end seal is provided before and after sandwiching the packaged object 12 of the tubular film 22 by the pair of seal bodies 30, 30, and the seal body 30
It is configured to be cut by the cutter 31 arranged at.

The support mechanism for the seal rollers 28, 28 is provided on a fixed plate 36 disposed below the film feeding path in the packaging machine 10 and is separated in a direction intersecting the film feeding direction with the path sandwiched therebetween. A pair of holders 38,38
2 (only one is shown in FIG. 2) is provided, and the fulcrum shafts 40 are vertically inserted and supported by the holders 38, respectively. Each fulcrum shaft 40
At the upper protruding portion from the holder 38, a support cylinder 44 that internally supports the rotation drive shaft 42 of the seal roller 28 is provided.
Is horizontally swingably arranged via an arm portion 44a protruding in the radial direction. Further, at the upper end of the support cylinder 44, one end is attached to the fulcrum shaft 40 by a mounting plate 46 pivotally supported so as to be horizontally swingable.
The heating means 3 is provided with an induction coil 48 for generating low-frequency electromagnetic radiation on the upper surface of the mounting plate 46.
2 are provided.

As shown in FIGS. 4 to 6, the heating means 32 has an inner core 52, which is erected on the upper surface of the inner circumference of the support ring 50, which is partially cut out in the circumferential direction in the radial direction, and an outer circumference. A cylindrical casing 56 is composed of the outer core 54 arranged on the side surface. The inner iron core 52 is formed in a cylindrical shape by winding a large number of thin silicon steel sheets, and the outer iron core 54 is formed in a cylindrical shape by a plurality of arc-shaped segments 54a which are arranged at required intervals in the circumferential direction. 50 to 6 in the annular space defined between the two iron cores 52 and 54.
An induction coil 48 for generating a low-frequency electromagnetic ray by passing a low-frequency current of 0 Hertz is installed. In addition,
A heat insulating coating material 58 is attached to each of the inner peripheral portion and the outer peripheral portion of the induction coil 48 facing the respective iron cores 52 and 54 and the bottom portion facing the support ring 50. The upper end of the induction coil 48 is set so as to face slightly below the upper ends of the two iron cores 52, 54 (see FIG. 4).

The center through hole 50 of the support ring 50
As shown in FIG. 4, a cylindrical spacer 60 having a flange 60a extending outward in the radial direction is formed at one end in the axial direction.
Is inserted with the flange 60a in contact with the lower surface of the support ring 50. Then, the lower inner peripheral surface of the inner iron core 52 is brought into contact with and supported by the outer peripheral surface of the spacer 60 facing the center through hole 50a.

The center through hole 56a of the casing 56 and the center through hole 46a of the mounting plate 46 are set so as to coincide with the center through hole 44b of the support cylinder 44, and are freely rotatable in the center through hole 44b of the support cylinder 44. The rotary drive shaft 42 inserted in the
Of the mounting plate 46 faces the inside of the central through hole 56a of the casing 56 in a non-contact manner via the central through hole 46a of the mounting plate 46. As shown in FIG. 4, a disc roller 62 is provided on the upper end of the rotary drive shaft 42.
By inserting the into the central through hole 42a of the drive shaft 42,
It is attached so that it can rotate integrally. The seal roller 28 is detachably attached to the upper surface of the disc roller 62. Further, the disc roller 62 is
It is positioned with a slight gap between its lower surface and the upper surface of the casing 56, and is set to efficiently generate an eddy current in the seal roller 28 by the low-frequency electromagnetic rays generated in the induction coil 48. It The diameter of the disc roller 62 is set to be slightly smaller than the outer diameter of the casing 56, and a thin annular copper plate 64 is formed on the lower surface of the plate 62 at a position corresponding to the position where the induction coil 48 is arranged. Is provided. This copper plate 64 is a disc roller 62.
Also, it functions to efficiently generate an eddy current in the seal roller 28. The seal roller 28 and the disc roller 62 are each made of a magnetic material such as carbon steel.

The seal roller 28 attached to each of the drive rotary shafts 42 through the disk roller 62 is a disk roller 6.
A flange 28a protruding outward in the radial direction is formed on the side (upper end) opposite to the side on which the two are arranged, and as shown in FIG. 3, both seal rollers 2 facing each other with the overlapping edge portion 22a sandwiched therebetween.
The outer peripheral sealing surfaces 28b and 28b of the flanges 28a and 28a of the reference numerals 8 and 28 are configured to sandwich the overlapping edge portion 22a. And both seal rollers 28, 28
However, by being induction-heated by the heating means 32, 32, the overlapping edge portion 22a sandwiched between the seal surfaces 28b, 28b is heat-sealed.

As shown in FIG. 7, an adjusting nut 66 is provided on the one support cylinder 44, and a tension spring is provided between an end portion of the nut 66 and a screw 68 provided on the other support cylinder 44. 70 is stretched, and the pair of seal rollers 28, 28 is connected to the seal surfaces 28b, 28b by the spring 70.
Is set so as to sandwich the overlapping edge portion 22a of the tubular film 22 with a predetermined pressure. The adjustment nut 6
By adjusting the tension of the tension spring 70 with 6, the film clamping pressure on the sealing surfaces 28b, 28b can be adjusted.

Sealer opening / closing levers 72, 73 are arranged at the lower ends of the support cylinders 44, 44, and one extension portion 72a of the levers 72, 73 extends outward in the radial direction of the support cylinders 44, 44. 73a is pivotally supported by the lower protrusions of the corresponding fulcrum shafts 40, 40 so as to be horizontally swingable. Further, the extension portions 7 of the sealer opening / closing levers 72, 73 extending on the opposite side of the extension portions 72a, 73a pivotally supported by the fulcrum shafts 40, 40.
A follower 74 is rotatably supported by 2b and 73b. As shown in FIG. 7, a forward / reverse rotatable motor 76 arranged on the fixed plate 36 via a bracket 75 and a motor plate 90 is integrally rotatable with a sealer opening / closing cam 77 having the illustrated shape on its output shaft 76a. It is installed in. The sealer opening / closing cam 77 is the follower 74, 7
The follower 74, 74 is configured to be capable of engaging and abutting on the cam surface of the sealer opening / closing cam 77 so that the follower 74, 74 faces between the extending portions 72b, 73b. That is, by biasing the motor 76 in the forward and reverse directions to rotate the sealer opening / closing cam 77 in the forward and reverse directions, the cam 77 and the followers 74, 74 are rotated.
Under engagement with the pair of sealer opening / closing levers 72, 73
Move toward and away from each other with the fulcrum shafts 40, 40 as fulcrums, whereby the pair of seal rollers 28, 28,
It is adapted to move between a closed position (seal position) close to each other and an open position separated from each other.

A tension spring 78, one end of which is locked to the motor plate 90, is provided at the free end of the one sealer opening / closing lever 73, which extends further outward from the extending portion 73b on which the follower 74 is pivotally supported. The other end of is locked. Further, the knob bolt 80 is attached to the motor plate 90 via the holder 79.
The tension spring 78 urges the knob bolt 80 so that the free end portion of the extension portion 73b of the one sealer opening / closing lever 73 is brought into contact with the knob bolt 80, and the film nipping position of the seal rollers 28, 28. Is to be positioned.

A position confirmation sensor 81 is arranged on the motor plate 90, and the sensor 81 is a sealer opening / closing cam 77.
Is configured to be able to detect the detection piece 82 disposed integrally with the sealer opening / closing lever 72, 73 (seal rollers 28, 28) according to the detection state of the detection piece 82. is there.

Holders 38, 38 of the fulcrum shafts 40, 40
The drive gears 83, 83 are rotatably disposed at the portions projecting downward from the drive gears 83, 83, and the driven gears 84 disposed at the portions projecting downward from the support cylinder 44 of the corresponding rotary drive shaft 42. It is in mesh. That is, when one of the driving gears 83 is rotationally driven by a driving means (not shown), the driven gears 84, 84 rotate in opposite directions via the driving gears 83, 83, whereby the pair of seal rollers 28, 2
8 also rotate in opposite directions to feed the tubular film 22 to the downstream side. The drive gear 83 and the driven gear 84 of each set are the same as those of the sealer opening / closing lever 7.
It is configured so that the meshed state is always maintained even when the 2,73 are opened and closed.

Each seal roller 28 has a seal surface 2
Inside the vicinity of 8b, temperature detecting means 86 including a temperature sensitive element such as a thermocouple or thermistor for detecting the current heating temperature of the film is arranged. The relay brush ring 87 of the temperature detecting means 86 is arranged at the lower end of each rotary drive shaft 42, and the lead wire (not shown) of the temperature detecting means 86 is wired through the central through hole 42a of the drive shaft 42. The brush ring 8
7 is connected. In addition, the seal opening / closing lever 7
Brushes 89, 89 are disposed on the holders 2, 73 via holders 88, 88 so that each brush 89 contacts a corresponding brush ring 87. Each brush 89 is connected to the temperature control means 34, and the temperature data detected by each temperature detection means 86 is input to the temperature control means 34. Then, in the temperature control means 34, the target seal temperature (appropriate heating temperature) is compared with the current temperature which is successively input, and the heating means 32, 32 are set so that both temperatures match.
Is configured to control operation. In addition, the temperature control means 34 is designed so that the target sealing temperature corresponding to the packaging film and the packaging rotation speed is input and stored in advance.

[0026]

Operation of the Embodiment Next, the operation of the vertical sealing device according to the embodiment thus constructed will be described. Induction coil 48 of heating means 32 arranged close to each of the seal rollers 28.
By applying a low-frequency current to the seal roller 28, an eddy current is generated in the seal roller 28 and the roller 28 is induction-heated. The current temperature of the seal roller 28 is input to the temperature control means 34 via the temperature detection means 86, and heating is continued until the measured temperature matches the target seal temperature. When the seal roller 28 is heated to the target seal temperature and sealing of the overlapping edge portion 22a of the tubular film 22 is started,
The overlapping edge portion 22a sandwiched between the sealing surfaces 28b and 28b of both sealing rollers 28 and 28 and fed downstream is heat-sealed.

Since the sealing rollers 28, 28 are rotated in the opposite directions to feed the overlapping edge portion 22a of the tubular film 22 to the downstream side, they are cooled by the air cooling action, but each roller is Numeral 28 indicates a sealing surface 28 by means of the heating means 32 arranged in the vicinity of the lower disk surface of the disk roller 62.
Since the entire b is always induction-heated, it is possible to reduce heat loss and prevent a sealing failure due to a temperature decrease at the film sandwiching position. Moreover, the temperature of the seal roller 28 is always kept at the target seal temperature by the temperature control means 34, so that the overlapping edge portion 22a is stably sealed.

The heating means 32 is the seal roller 2
Since it is fixedly arranged in a non-contact manner with respect to 8, power can be supplied without using a brush ring or the like,
Power troubles can be eliminated, and the structure is simplified to improve maintainability. Further, since the heating means 32 of the low frequency induction heating system is used, it is not necessary to provide the cycle converter, so that the manufacturing cost can be kept low.

Here, as shown in FIG. 10, in the vertical sealing device according to the prior art in which the casting heaters 94 are respectively installed in the heating rollers 93, 93 connected to the pair of sealing rollers 92, 92, the temperature of the sealing roller 92 is increased. The temperature is controlled by inserting the temperature sensor 95 in the vicinity of the seal surface of the roller 92. Since the heater 94 is arranged on the side opposite to the seal surface with the temperature sensor 95 interposed therebetween, even when the temperature rises. It was difficult to maintain the seal surface at the target seal temperature accurately due to the time lag even when descending, and it was particularly difficult to heat seal a thin film. On the other hand, in the induction heating type vertical sealing device according to the embodiment, since the sealing roller 28 itself generates heat, there is little time lag with respect to the target sealing temperature, the temperature of the sealing surface 28b can be accurately maintained, and the thin film 22 can be maintained. However, good heat sealing is possible.

[0030]

[Experimental Example] In the vertical sealing device of the embodiment shown in FIG. 4 and the conventional vertical sealing device of the casting heater system shown in FIG. 10, each sealing roller 28, 92 is heated from room temperature to 200 degrees Celsius. The graph of FIG. 8 shows the results of measuring the temperature rise at that time and the temperature fall from 200 degrees Celsius to room temperature.

That is, in the experiment, the temperature rise characteristic of the seal roller 28 of the embodiment when a current is applied to the induction coil 48 is faster than that of the casting heater method, and the rising time from room temperature to 200 ° C. is the casting heater method. It took 13 minutes to reduce the power consumption to 8 minutes in the induction heating method, to about 62% in the ratio, and to reduce power consumption to about 62%. Further, the fall time constant obtained from the measurement result of the fall time when the current is cut off is 27 minutes in the induction heating method compared to 37 minutes in the conventional casting heater method, and the heat capacity of the induction heating method is the casting heater. It can also be seen that it is about 73% compared to the method. Therefore, the temperature fall characteristic in the induction heating system is rapidly lowered in the opposite manner to the rise, so that it is possible to reduce the time loss at the time of setup change such as packaging capacity.

In the above experimental example, the temperature rise of the casing 56 in the induction heating type heating means 32 was slight, and increased only up to about 70 degrees Celsius.

In a packaging test using a plastic packaging material laminated with aluminum foil, when the induction heating capacity is equivalent to 300 watts and the temperature of the seal roller 28 is set to 300 degrees Celsius, a speed of 36 meters per minute is obtained. It was possible to continuously seal for a long time. This corresponds to the speed at which a pillow type package having a length of 180 mm is packaged at a capacity of 200 pieces per minute. When this is performed by the casting heater method shown in FIG. 10, the temperature of the seal roller 92 during continuous operation cannot be kept at 300 degrees Celsius continuously.

[0034]

[About another embodiment] FIG. 9 shows a vertical sealing device according to another embodiment. Since the basic structure is the same as that of the above-mentioned embodiment, only different parts will be described. As shown in the drawing, an annular heat pipe 85 enclosing a working fluid that generates evaporative gas when heated is disposed at an internal position close to the seal surface 28b of each seal roller 28. It is configured to make the temperature distribution of the seal surface 28b of the seal roller 28 heated by 32 uniform. By thus incorporating the heat pipe 85 functioning as a soaking means in the seal roller 28, it is possible to further stabilize the sealing of the overlapping edge portion 22a which is heat-sealed by the seal rollers 28, 28. Become. That is, when heat-sealing the overlapping edge portion 22a, each seal roller 28 induction-heated by the heating means 32 is heated by the heat pipe 85 disposed inside the seal roller 28 adjacent to the seal surface 28b.
The temperature distribution over the entire circumference of 8b is kept uniform, and the amount of heat taken by the film 22 during sealing is minimized.
A stable and good seal is achieved.

In the embodiment, the temperature detecting means 86 is incorporated in the seal roller 28 to detect the roller temperature.
The present application is not limited to this. For example, as shown by a chain double-dashed line in FIGS. 2 and 3, an infrared type temperature detecting means 91 capable of measuring the temperature in a non-contact manner is provided in the vicinity of the seal surface 28b of the seal roller 28. The measured current temperature of the seal roller 28 can be input to the temperature control means 34 to control the temperature of the heating means 32. In this case, the brush ring and the like associated with the temperature detecting means 91 can be omitted, and the occurrence of troubles such as contact failure can be eliminated.

Further, in the embodiment, the seal roller 28 and the disc roller 62 are constructed as separate bodies, but both rollers may be constructed integrally. Further, as the heat equalizing means, instead of disposing the heat pipe in which the working fluid is sealed, it is possible to form an annular passage in the seal roller and seal the working fluid in the passage.

[0037]

As described above, according to the vertical sealing device in the bag-filling and packaging machine according to the present invention, the heating means for heating the sealing roller is fixedly arranged, so that the brush ring for supplying power is provided. There is no need, and it is possible to prevent power troubles due to wear of the brush contacts and poor contact. Moreover, since the heating means is disposed close to the disk surface of the seal roller or the disk roller to which the roller is detachably attached, the entire roller is directly heated even when the seal roller is rotating. Therefore, heat loss can be significantly reduced and power consumption can be suppressed low.

Further, by adopting the low frequency induction heating system of 50 to 60 Hertz, it is not necessary to separately provide a cycle converter for induction heating. Further, since it is an induction heating system, the seal roller itself serves as a heat source, so that the amount of heat lost to the film when the packaging machine is put into operation can be quickly replenished, and a stable seal can be achieved.
Furthermore, by adopting the non-contact temperature detecting means as the means for detecting the seal surface temperature of the seal roller, the brush ring for the temperature detecting means can be omitted, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a horizontal bag-making filling and packaging machine provided with a vertical sealing device according to an embodiment.

FIG. 2 is a side view showing the vertical sealing device according to the embodiment with a part thereof cut away.

FIG. 3 is a plan view of a main part of the vertical sealing device according to the embodiment.

FIG. 4 is a vertical cross-sectional front view showing an arrangement portion of a seal roller and a heating unit according to an embodiment.

FIG. 5 is a plan view of the heating means according to the embodiment.

FIG. 6 is a bottom view of the heating means according to the embodiment.

FIG. 7 is a cross-sectional plan view of essential parts of the vertical sealing device according to the embodiment.

FIG. 8 is a graph showing the results of an experimental example.

FIG. 9 is a vertical sectional front view of a main part of a vertical sealing device according to another embodiment.

FIG. 10 is a vertical sectional front view of a main part of a vertical sealing device according to a conventional technique.

[Explanation of symbols]

 22 film 22a superposed edge 28 seal roller 28b seal surface 32 heating means 34 temperature control means 42 rotary drive shaft 48 induction coil 56 casing 64 disc roller 85 heat pipe (uniform temperature means) 86 temperature detection means (contact type) 87 Brush ring for relay 89 Brush 91 Temperature detection means (non-contact type)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyo Seko 4-380 Nakaodai, Nishi-ku, Nagoya-shi, Aichi Prefecture Fujikikai Co., Ltd. Nagoya factory

Claims (4)

[Claims] 1. A vertical sealing device for longitudinally sealing a superposed edge portion (22a) extending in a feeding direction of a tubular film (22), which comprises superposing the tubular film (22). A pair of seal rollers (28, 28) which are disposed opposite to each other with the end edge portion (22a) sandwiched therebetween, and sandwich the film (22) and rotate in mutually opposite directions, and the seal rollers ( A rotary drive shaft (42) which is indirectly connected to the roller (28) or through a disc roller (62) detachably attached to the roller (28) and rotationally drives the seal roller (28). A cylindrical casing (56) provided with an induction coil (48) that is fixedly arranged in proximity to one of the disc surfaces of the seal roller (28) or the disc roller (62) and that generates electromagnetic waves of low frequency.
Consisting of a heating means (32), each of the rotary drive shafts (42), the axis of which coincides with the central axis of the corresponding cylindrical casing (56).
A vertical sealing device in a bag-making filling and packaging machine, which is rotatably inserted in (56). 2. Each of the seal rollers (28) is provided with a roller (2).
A temperature detecting means (86) for measuring the temperature of 8) is provided, and the rotary drive shaft (42) of the seal roller (28) is provided with the relay brush ring (87) of the temperature detecting means (86). A brush (89) is provided which comes into contact with the brush ring (87) and is disposed, and the seal roller (28) is provided by the present temperature measured by the temperature detecting means (86) and the preset target seal temperature. )
The vertical sealing device in the bag making and packaging machine according to claim 1, further comprising temperature control means (34) for controlling the temperature of the bag to an optimum temperature. 3. A temperature detecting means (91) for measuring the temperature of a seal surface of each of the seal rollers (28) in a non-contact manner, and a current temperature measured by the temperature detecting means (91) and a preset input. Seal roller (28) according to the set target seal temperature
The vertical sealing device in the bag making and packaging machine according to claim 1, further comprising temperature control means (34) for controlling the temperature of the bag to an optimum temperature. 4. The seal roller (28) is provided with the roller (28).
The ring-shaped heat equalizing means (8
The vertical sealing device in the bag making filling and packaging machine according to any one of claims 1, 2 and 3, wherein 5) is provided.