JP3486861B2 - Fusing seal device in packaging machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusing and sealing device for stably fusing and sealing the overlapping edge portion of a film in the longitudinal direction.

[0002]

2. Description of the Related Art Conventionally, a packaging machine such as a horizontal bag-filling machine for packaging an article to be packaged using a heat-shrinkable film is constructed by continuously stacking a longitudinally superposed edge portion of a tubular formed tubular film. A fusing seal device for fusing and sealing is provided. The fusing and sealing device is provided on a downstream side of a pair of feed rollers that are driven to rotate in mutually opposite directions and sandwich the overlapping edge portion in the longitudinal direction of the tubular film to transport it to the downstream side. A fusion cutting sealer comprising a receiving roller and a cutting roller which are driven to rotate and are heated, and the overlapping edge portion of the tubular film is pinched by the receiving roller and the cutting roller, and the fusing sealer is operated under the cooperation of both rollers. It is configured to provide a fusing seal to the overlap edge.

[0003]

Since the cutting roller is heated to a predetermined high temperature capable of melting and cutting the superposed edge portion of the tubular film, a thin heat shrinkable film which is not stiff in a packaging machine is used. In this case, sagging development occurs instantaneously at the polymerization edge passing through the film sandwiching position of the fusing sealer, and the fusing part in the molten state adheres to each roller to cause film scraps and tubular film. There is a problem that the back tension acts on the transfer direction and the fusing is not stably performed, and the fusing part is not beautiful and the appearance is poor.

Narrow band-shaped film scraps generated when the longitudinal edge of the tubular film is continuously fused and sealed by the fusing and sealing device are heated to a lower temperature than the cutting roller. And is wound up by a winding device separately provided and discarded. In this case, at the time of initial setting of the tubular film before packaging or during film exchange, the tip of the film scrap is free and not set in the winding device, and the film scrap tip is attached to the winding device. Since it is transferred without being applied with tension until it is set, there is a possibility that the melted and fused portion adheres to the fusion cutting sealer and winds. Therefore, the film waste may be broken while the leading end of the film waste is pulled out until it is set in the winding device.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the above-mentioned conventional techniques, and is proposed in order to solve this problem. An object of the present invention is to provide a fusing and sealing device in a packaging machine, which can improve the appearance and can prevent the film scraps from breaking during the initial setting of the film.

[0006]

[Means for Solving the Problems]
In order to preferably achieve the intended purpose, the fusing sealing device in the packaging machine according to the present invention is a fusing sealing device in a packaging machine for fusing and sealing the polymerized edge portion of the film,
A pair of first feed rollers that are driven to rotate in mutually opposite directions and sandwich the overlapping edge portion of the film and transport the film toward the downstream side; and a downstream of the first feed roller in the film transport direction. And a fusing sealer, which is provided on a side of the film and is driven to rotate in opposite directions by sandwiching the overlapping edge portion of the film, and a cutting roller heated to a temperature higher than that of the receiving roller; A pair of strips are provided on the downstream side of the sealer in the film transport direction, are driven to rotate at a peripheral speed slightly higher than the peripheral speed of rotation of the fusing sealer, and sandwich and pull out the strip-shaped film scraps fused by the fusing sealer. A second feed roller, and a pair of first fuses is provided with respect to the film fusing and sandwiching position of the fusing sealer.
The first film nipping position and the second film nipping position of the pair of second feed rollers of the feed roller, the roller side received from the film transfer line through the film fusing nip position displacement
And wrap it around the film stack edge roller
A structure is provided so that the receiving surface of the receiving roller can be held in a tensioned state.
It is characterized in that form.

[0007]

In the film having the overlapping edge portions nipped by the pair of first feed rollers and transported toward the downstream side, the overlapping edge portions are rotatably driven in opposite directions constituting the fusing sealer. It is transported to the downstream side while being sandwiched between the roller and the cutting roller, and is fused and sealed by the cooperation of both rollers. Then, the film scraps melted from the film are nipped by the second feed roller on the downstream side which is set to a peripheral speed slightly higher than the peripheral speed of rotation of the melting sealer, and tension is always applied to the film scraps. Pulled out,
The film scraps are prevented from being broken during the initial setting work of the film, and a stable fusing seal is achieved. With respect to the film fusing and clamping position of the fusing sealer, the first film clamping position of the upstream first feed roller and the second film clamping position of the downstream second feed roller are from the film transfer line passing through the film fusing and clamping position. Since they are respectively displaced to the receiving roller side, the overlapping edge portions before and after passing through the film fusing and sandwiching position of the fusing sealer are wound around the outer periphery of the receiving roller for a predetermined length and separated from the high temperature cutting roller. Pass through. That is, the overlapping edge portion is satisfactorily melted by both rollers in a state in which it is held and stretched by the surfaces of a required length before and after sandwiching the film fusing and sandwiching position according to the vertical width of contact with the outer circumference of the receiving roller. To be done. Therefore, it is possible to prevent the generation of back tension in the film transport direction due to the sagging of the film at the time of fusing and to obtain a beautiful fusing part.

A second diameter set smaller than the fusing sealer
By disposing the feed roller close to the fusing sealer, the gap between the fusing sealer and the transfer means for the subsequent process disposed further downstream of the second feed roller can be set to be short, and the film to be supplied to the film can be supplied. Good delivery and transfer of packages. Further, the second feeding roller having a film holding surface made of a heat-resistant elastic material ensures the transfer of the film waste to the winding device. Further, by setting the displacement amounts of the film feeding positions of the first feeding roller and the second feeding roller with respect to the film fusing and sandwiching position of the fusing sealer to be the same, the film can be stably transported without meandering. This also stabilizes the fusing seal at the overlap edge.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a fusing and sealing device in a packaging machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments.

FIG. 1 shows a schematic structure of a fusing and sealing device. The device 10 has a length facing a lower side of a tubular film (film) 12 which is drawn from a supply source (not shown) and formed into a tubular shape. It is provided with a pair of first feed rollers 14 and 14 for sandwiching the overlapped edge portion 12a in the direction and being rotationally driven in opposite directions by a drive system (not shown) to transport the film 12 toward the downstream side. This first feed roller 14,1
4, a fusing sealer 19 for fusing and sealing the overlapped edge portion 12a of the tubular film 12 is provided on the downstream side in the film transport direction with respect to 4. The fusing sealer 19 is composed of a receiving roller 16 and a cutting roller 18 which are arranged opposite to each other with the overlapping edge portion 12a of the tubular film 12 interposed therebetween, and both rollers 16 and 18 are opposed to each other by a drive system (not shown). It is set so that the knife edge 18a formed on the cutting roller 18 comes into contact with the outer peripheral surface of the receiving roller 16 (the receiving surface of the overlapping edge portion 12a) with a predetermined pressure while being rotationally driven in the direction (see FIG. 3). Further, the receiving roller 16 is provided with a built-in heater (not shown) so that the overlapping end portion 12 of the tubular film 12 is overlapped.
a is heated to a temperature low enough to preheat the cutting roller 18
Is heated by a built-in heater (not shown) at a temperature higher than that of the receiving roller 16 to a temperature at which the overlapping edge portion 12a can be melt-cut. That is, the fusing sealer 19
The overlapping end edge portion 12a in the longitudinal direction of the tubular film 12 sandwiched at the film fusion sandwiching position of the receiving roller 16 and the cutting roller 18 constituting the above is fused and sealed by the cooperation of both rollers 16 and 18. .

A pair of narrow strip-shaped film scraps 12b fused by the fusing sealer 19 are sandwiched between the fusing sealer 19 and the downstream side of the fusing sealer 19 so as to be pulled out from the fusing sealer 19 and transported toward the winding device 20. Second
The feed rollers 22, 22 are arranged. Second feed roller 2
As shown in FIG. 1, 2, 22 are set to have a smaller diameter than the rollers 16, 18 of the fusing sealer 19 and are arranged close to the fusing sealer 19 and supplied to the tubular film 12 to be packaged 24. Is configured so that the delivery and transfer to the downstream side can be performed well. In addition, the second feed rollers 22, 22
Is configured to be rotationally driven by a drive system (not shown) at a peripheral speed slightly higher than the peripheral speeds of the rollers 16 and 18 in the fusing sealer 19.
However, it is transferred while being stretched between the fusing sealer 19 and the second feed rollers 22, 22. Further, a heat-resistant elastic material 26 such as silicon rubber is wound around the outer periphery of at least one of the pair of second feeding rollers 22 and 22, and a film holding surface is formed by the elastic material 26. Configured.

The first feed roller 14, 14, the second feed roller 22, 22, and the rollers 16, 18 of the fusing sealer 19 are arranged such that the pair of rollers can move toward and away from each other. Then, the rollers are separated from each other so that the initial setting work of the tubular film 12 can be performed when the film is exchanged.

The first film sandwiching position of the pair of first feed rollers 14, 14 and the second film sandwiching position of the pair of second feed rollers 22, 22 with respect to the film fusion sandwiching position of the fusion sealer 19 are shown in FIG. As shown in FIG. 6, the film is set to be slightly displaced from the film transfer line passing through the film fusing and clamping position to the receiving roller 16 side. That is, the lengthwise overlapping edge portion 12a of the tubular film 12 passing through the film fusing and clamping position of the fusing sealer 19 is wound around the outer periphery of the receiving roller 16 by a predetermined length before and after the film fusing and clamping position. It is configured to be separated from the hot cutting roller 18. And thus, the overlapping edge portion 1
By wrapping the 2a around the receiving roller 16, the overlapping edge portion 12a is held by a surface of a required length before and after sandwiching the film fusing and sandwiching position corresponding to the vertical width in contact with the outer periphery of the receiving roller 16, When the rollers 16 and 18 are fused, the overlapping edge portion 12a is held in a state of being stretched by the receiving surface (outer peripheral surface) of the receiving roller 16. It should be noted that the first feed rollers 14, 14 and the second feeding roller 14 and the second position with respect to the film fusing and sandwiching position of the fusing sealer 19 are held.
The displacement amounts α of the feed rollers 22 and 22 at the film sandwiching positions are set to be the same, and the tubular film 12 can be stably transported without meandering.

Below the fusing and sealing device 10, FIG.
As shown in FIG. 3, a winding device 20 for winding the film scrap 12b transferred from the second feed rollers 22, 22 is provided. Further, a guide member 28 and a traverser 30 are arranged in the winding path of the film scrap 12b between the second feeding rollers 22 and 22 and the winding device 20, and as shown in FIG. The film scrap 12b transported from 22 in the direction intersecting the film transport line is guided to the winding device 20 via the guide member 28 and the traverser 30. In the embodiment, the film scrap 12b is transferred from the film transfer line toward the side where the cutting roller 18 is arranged.

[0015]

Next, the operation of the fusing and sealing device in the packaging machine according to the above-described embodiment will be described. The tubular film 12, which is tubularly formed and supplied with the article to be packaged 24,
A longitudinal overlapping edge portion 12a facing downward is provided with a pair of first feed rollers 14, which are rotationally driven in mutually opposite directions.
It is sandwiched by 14 and transferred toward the downstream side. The overlapping edge portion 12a is conveyed to the downstream side while being sandwiched between the receiving roller 16 and the cutting roller 18 of the fusing sealer 19 which are rotationally driven in opposite directions, and both rollers 16,
A fusing seal is provided under the cooperating action of 18. As described above, the first film sandwiching position of the upstream first feed rollers 14, 14 is displaced from the film transport line to the receiving roller 16 side with respect to the film fusion sandwiching position of the fusion sealer 19. Therefore, the overlapping edge portion 12a of the fusing sealer 19 immediately before passing through the film fusing and sandwiching position passes a position where it is wound around the outer periphery of the receiving roller 16 for a predetermined length and is separated from the high temperature cutting roller 18. That is, the overlapping edge portion 12a is held by a surface having a required front-rear length that sandwiches the film fusing and sandwiching position corresponding to the vertical width that abuts against the outer periphery of the receiving roller 16, and thus the overlapping edge portion 12a is held. Both rollers 1 with the receiving surface (outer peripheral surface) of the receiving roller 16 stretched
Sufficiently melted by 6,18. Therefore, for example, even in the case of a thin heat-shrinkable film which is not stiff, it is possible to prevent the occurrence of back tension in the film transfer direction due to the slack of the film when the film is melted, and the melted part becomes beautiful and has a good appearance. .

As shown in FIG. 1, the narrow strip-shaped film scrap 12b melted by the melt-cut sealer 19 is nipped by the second feed rollers 22 and 22 on the downstream side, and in a direction intersecting the film transfer line. Transferred to. Then, the film scrap 12b is guided to the winding device 20 via the guide member 28 and the traverser 30 and is wound by the device 20. Second feed rollers 22,2
The second second film holding position is displaced from the film transfer line to the receiving roller 16 side with respect to the film fusing holding position of the fusing sealer 19 as described above. Therefore, the film scrap 12b that has been melted and cut from the tubular film 12 by passing through the film melt sandwiching position of the melt sealer 19
Is wound around the outer periphery of the receiving roller 16 for a predetermined length and passes through a position separated from the high temperature cutting roller 18.
Further, since the rotational peripheral speeds of the second feed rollers 22 and 22 are set to be slightly higher than the rotational peripheral speed of the fusing sealer 19, the film scrap 12b pulled out from the fusing sealer 19 is drawn.
The film scrap 12b is held in a stretched state and is heated by the high temperature cutting roller 18 to be melted, or the fusing sealer 1
Adhesion to 9 is suppressed. Also, the fusing sealer 1
From the film fusing and sandwiching position of 9 to the second feed rollers 22 and 2
It is also prevented that the film scraps 12b are cooled while being transferred to the second film holding position of No. 2, and the film scraps 12b are stretched due to thermal insulation and are not broken during being wound by the winding device 20. To be done.

At the time of initial setting of the tubular film 12 before packaging or when exchanging the film, the leading end of the film scrap 12b is not set on the winding device 20, but in the fusing seal device 10 of the embodiment, the fusing cutting is performed. Sheila 1
The second feed rollers 22 and 2 which are arranged on the downstream side of 9 and are set to a peripheral speed slightly higher than the peripheral speed of rotation of the fusing sealer 19.
2 allows the film scrap 12b to be pulled out in a state where tension is always applied. That is, the molten fusing part of the tubular film 12 does not adhere to the fusing sealer 19, and the film scrap 10b is initially set during the initial setting of the film.
It is possible to prevent the film scrap 10b from breaking while the leading end of the film is pulled out until it is set on the winding device 20.

In the embodiment, the first feed rollers 14 and 14 are positioned relative to the film fusing and sandwiching position of the fusing sealer 19.
Since the displacement amount α of the film clamping position of the second feed rollers 22 and 22 is set to be the same, the tubular film 12
Does not meander, and a stable fusing seal can be applied to the overlapping edge portion 12a. Further, since the heat-resistant elastic material 26 is wound around the second feeding roller 22 on one side, the film scrap 12b can be reliably sandwiched and stably transferred to the winding device 20.

The object to be packaged 24, which is supplied to the tubular film 12 with the overlapped edge portion 12a being fusion-sealed, is disposed in the downstream side together with the tubular film 12 and is a transfer means in a subsequent step (not shown). It will be delivered to the downstream side. In this case, the second feed rollers 22, 22
Since it has a small diameter and is placed close to the fusing sealer 19,
The separation distance between the fusing sealer 19 and the transfer means can be set to be short, and the article to be packaged 24 can be delivered and received satisfactorily.

In the examples, the packaging machine having a structure in which the longitudinal overlapping edge portion facing the lower side of the tubular film is fused and sealed is described. However, the longitudinal overlapping edge portion is provided laterally of the tubular film. The fusing and sealing device of the present invention can also be applied to a packaging machine configured to position. That is, this can be dealt with by arranging the rotation axes of the rollers horizontally. Further, the displacement amount of the first film holding position of the first feed roller and the displacement amount of the film holding position of the second feed roller with respect to the film fusing holding position of the fusing sealer conveys the tubular film without meandering. It does not have to be the same as long as it is within the range. Further, a heat-resistant elastic material may be wound around both the pair of second feed rollers to form a film holding surface. In addition,
In addition to the film scraps being wound up on a winding device and collected, it is possible to adopt a configuration in which they are discharged to an external collecting box or the like by air suction or the like.

[0021]

As described above, in the fusing and sealing device in the packaging machine according to the first aspect of the present invention, the film fusing according to the vertical width at which the overlapping edge portion of the film contacts the outer circumference of the receiving roller. A stable fusing seal can be achieved because it can be melted in a stretched state while being held by the surfaces having a required length before and after the nipping position. That is, the fusing seal can be stably performed regardless of the properties of the film, and the fusing part can be made beautiful and have a good appearance. Also,
It is possible to cool the blown by the film debris up to the second feed roller, the film debris or elongation by fusing heat is had prevents from being broken on the way to be wound by the winding device obtain. Further, at the time of initial setting of the film before packaging or at the time of film exchange, it is possible to pull out the film waste with tension always applied by the second feed roller set to a peripheral speed slightly higher than the peripheral speed of rotation of the fusing sealer. Therefore, it is possible to prevent the film scraps from being broken while the leading ends of the film scraps are being drawn out until they are set in the winding device.

In the fusing and sealing device according to the second aspect of the present invention, since the second feed roller has a smaller diameter than the fusing sealer and is arranged closer to the fusing sealer, the second feed roller is disposed on the downstream side of the packaged object wrapped with the film. It is possible to satisfactorily perform the delivery and transfer of the. Further, in the fusing and sealing device according to claim 3 of the present invention, since the film sandwiching surface of at least one of the pair of second feed rollers is made of a heat-resistant elastic material, a device for winding the fusing film waste The transfer to can be performed more stably. Further, in the fusing seal device according to the fourth aspect of the present invention, since the displacement amounts of the film feeding positions of the first feeding roller and the second feeding roller with respect to the film fusing holding position of the fusing sealer are set to be the same, the film meanders. As a result, a stable fusing seal can be applied to the overlapping edge portion.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a fusing and sealing device according to a preferred embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a fusing seal device and a winding device according to an embodiment.

FIG. 3 is a schematic configuration diagram showing a fusing sealer according to an embodiment.

FIG. 4 is an explanatory diagram showing a relationship between film holding positions in each roller of the fusing seal device according to the embodiment.

[Explanation of symbols]

12 tubular film (film) 12a overlapping edge 12b film scrap 14 first feed roller 16 receiving roller 18 cutting roller 20 winding device 22 second feed roller 26 elastic material α displacement amount

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 10-86903 (JP, A) Actual exploitation 64-23405 (JP, U) Actual exploitation Flat 7-21506 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B65B 51/10 B65B 51/26-51/30 B65B 9/00-9/24

Claims (4)

(57) [Claims] 1. A fusing and sealing device in a packaging machine for fusing and sealing a superposed edge portion (12a) of a film (12), wherein the superposed edge portion of the film (12) is driven to rotate in mutually opposite directions. (12a) is sandwiched and the film (1
2) a pair of first feed rollers (14, 14) for transporting the film, and a stacking edge portion of the film (12) provided on the downstream side in the film transport direction with respect to the first feed rollers (14, 14) (12
A fusing sealer (19) consisting of a heated receiving roller (16) sandwiching a) and driven to rotate in mutually opposite directions, and a cutting roller (18) heated to a temperature higher than the receiving roller (16), It was provided on the downstream side of the fusing sealer (19) in the film transfer direction, was rotationally driven at a peripheral speed slightly higher than the peripheral speed of rotation of the fusing sealer (19), and was fused by the fusing sealer (19). It is composed of a pair of second feed rollers (22, 22) for sandwiching and pulling out the strip-shaped film waste (12b), and a pair of first feed rollers (14, 14) with respect to the film fusion sandwiching position of the fusion sealer (19). a first second film nipping position of the film nipping position and the pair of second feed rollers (22, 22) of 14), is displaced receiving the roller (16) side from the film transport line through the film fusing nip position, the film polymerization
The edge roller (12a) is wrapped around the receiving roller (16)
A fusing and sealing device in a packaging machine, characterized in that it can be held in a stretched state by the receiving surface of (16) . 2. The fusing in the packaging machine according to claim 1, wherein the second feed roller (22, 22) has a diameter smaller than that of the fusing sealer (19) and is arranged in the vicinity of the fusing sealer (19). Sealing device. 3. The film sandwiching surface of at least one roller (22) of the pair of second feed rollers (22, 22) is made of a heat resistant elastic material (26). A fusing and sealing device in a packaging machine. 4. The displacement amount (α) of the film feeding position of the first feeding roller (14, 14) and the second feeding roller (22, 22) with respect to the film fusing holding position of the fusing sealer (19) is set to be the same. The fusion cutting sealing device in the packaging machine according to any one of claims 1 to 3.