JP4756673B2 - Center seal device and automatic packaging machine - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a center seal device and an automatic packaging machine installed in an automatic packaging machine.
[0002]
[Prior art]
As is well known, the pillow wrapping machine forms a continuously drawn belt-like film into a cylindrical shape using a bag making machine. As a result, both side edges of the belt-like film are polymerized, so that the polymerization ends are sealed with a center seal device, and a cylindrical film is formed. On the other hand, since the articles to be packaged are sequentially supplied into the bag making machine at regular intervals, the articles to be packaged are also included in the cylindrical film at predetermined intervals, and the cylindrical film and the articles to be packaged are kept in this state. Will be transported. Furthermore, an end seal device is installed on the downstream side of the center seal device, and a predetermined position of the cylindrical film is sealed in the lateral direction of the traveling direction and cut to produce a pillow package that seals the package. It has become.
[0003]
A center seal device for sealing the overlapped end of the film usually includes at least one set of heating rollers. The heating end is sandwiched with a predetermined pressure from both sides by this heating roller, and is rotated in that state. At this time, the heating roller heats, for example, a film portion that is in contact with a built-in heater in a pressurized state. As a result, the film portion in contact with the heating roller is softened and further melted by being heated, so that the contact surfaces of the film polymerization ends are bonded to each other.
[0004]
Thereafter, when the film passes through the heating roller, the heated and melted film portion is cooled (natural cooling or forced cooling), and the above-described bonding at the film polymerization end is completed and bonded (sealed).
[0005]
[Problems to be solved by the invention]
However, the above-described conventional apparatus has the following problems. That is, the pair of heating rollers contact the outer surface of the film polymerization end, whereas what is actually bonded is the inner surface (contact surface) of the film polymerization end. Therefore, the heat from the heating roller is transmitted from the outer surface to the inner surface of the film polymerization end with which the heating roller contacts. Therefore, as a matter of course, the temperature is higher on the outer surface of the film polymerization end.
[0006]
As a result, for example, in the case of a single film, if the temperature is high enough to allow the inner surface to adhere, the outer surface becomes even higher, causing the surface of the film to become sticky and cause a seal failure. Furthermore, since the outer surface of the film is also melted and softened, it looks bad. Further, in the case of a thick film, heat is not easily transmitted, and thus a film material having a certain thickness or more cannot be used.
[0007]
The present invention has been made in view of the above-described background, and an object of the present invention is to provide a center seal device and an automatic packaging machine that can perform center sealing reliably and cleanly.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, the center seal device according to the present invention includes a means for forming a continuously drawn belt-like film into a cylindrical shape, and a seal at the polymerization end of the cylindrical film formed in the cylindrical shape. The center seal device used in an automatic packaging machine comprising: a center seal device to be applied; and an end seal device that is disposed downstream of the center seal device and seals and cuts in the width direction of the tubular film. A sealing device main body for heat-sealing with the overlapping end interposed therebetween, and a preheating device that is disposed upstream of the sealing device main body and preheats a portion to be heat-sealed by the sealing device main body, the all SANYO for heating the inner contact surfaces of the polymerization end directly tip enters into the polymerization end, to separate the opposite side edges of the tubular film is a polymer end An upper plate fixing nozzle and a device for injecting hot air disposed below the upper plate fixing nozzle so as to move up and down are provided. The upper plate fixing nozzle includes an inclined plate having a through hole, and injects the hot air. The hot air jetted from the apparatus was jetted to the inner contact surface of the overlapping end through the through hole.
[0009]
A strip-shaped flat nozzle having an elongated opening may be attached to the outlet of the apparatus for injecting hot air, and the opening may be opposed to the upper plate fixing nozzle.
[0010]
According to the present invention, since the preheating device directly heats the inner bonding surface of the polymerization end of the tubular film to be finally bonded, the polymerization end after passing through the preheating device is more inner than the outer surface of the film. Becomes hotter. Therefore, when the pre-heated polymerization end is pressurized and heated and heat-sealed by the sealing device body located on the downstream side, even if the heating temperature is lowered, it is securely bonded and the adhesion is improved. To do.
[0011]
Since the heating temperature in the sealing device main body can be lowered, the outer surface is not sticky even with a single film, and a reliable sealing can be achieved. Even if the film is thick, the inner surface of the film is preliminarily warmed, so that sealing is possible. Further, since the heating is performed at a relatively low temperature, the outer surface of the center-sealed portion is not melted and the aesthetic appearance is improved.
[0012]
Further, the fixed nozzle includes an inclined plate having a through hole, and the hot air is jetted to the inner contact surface of the overlapping end through the through hole, so that the hot air is more reliably applied to the inner surface of the film. as possible out it is possible to inject.
[0013]
In the embodiment, the seal device body corresponds to the center seal device body 30 and is a rotary sealer. However, a bar sealer may of course be used. Further, in the embodiment, the preheating device uses hot air, but it may be preheated directly by a heater, and in short, any device that can directly heat the inner contact surface of the polymerization end of the tubular film may be used. .
[0014]
In the automatic packaging machine according to the present invention, the center seal part of the manufactured package is more reliably and neatly heat-sealed by providing the center seal device of each configuration described above.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a preferred embodiment of the present invention. In this embodiment, an example applied to a pillow packaging machine is shown. As shown in the figure, the belt-like film 11 is continuously drawn out from the original fabric roll 12 through a number of tension rollers 13 and guided to the bag making machine 14. Then, by passing through the bag making device 14, the belt-like film 11 is formed into a tubular shape and becomes a tubular film 15.
[0016]
On the other hand, a supply conveyor 16 is disposed on the rear side (upstream side) of the bag making device 14 in the advancing direction, and the supply conveyor 16 is disposed so that the carry-out end is located near the entrance of the bag making device 14. . The supply conveyor 16 includes an endless chain 18 provided between a pair of sprockets 17 and 17 ′, and fingers 19 disposed at predetermined intervals of the endless chain 18. And the to-be-packaged object 20 is pushed in with this finger 19, and the to-be-packaged object 20 is sequentially transferred in the above-mentioned cylindrical film 15 for every predetermined interval.
[0017]
Further, the article 20 to be packaged pushed by the finger 19 moves together with the cylindrical film 15, is heated by the center seal device 21 arranged in the next stage of the bag making machine 14, and is transferred in the middle of the cylindrical film. Fifteen film polymerization ends 22 are heat-sealed to be center-sealed.
[0018]
And the cylindrical film 15 to which the center seal is applied is further advanced and sealed and cut in the advancing direction lateral direction by the end seal device 24 disposed in the next stage so that the package 25 is manufactured. It has become. The package 25 is carried out by the carry-out conveyor 26.
[0019]
In the present invention, as shown in FIG. 2, the center seal device 21 includes a center seal device main body 30 and a preheating device 31 installed on the upstream side of the center seal device main body 30. Further, a pair of pinch rollers 27 are disposed on the upstream side and the downstream side of the center seal device 21, respectively, and a conveying force is applied to the film polymerization end 22 of the tubular film 15 by the pinch rollers 27. .
[0020]
The center seal device main body 30 includes a large-diameter disk-shaped heating roller 32 with a built-in heater, and a small-diameter disk-shaped auxiliary roller 33 that can contact the side surface of the heating roller 32. Two auxiliary rollers 33 are installed along the traveling direction of the tubular film 15. Thus, the film overlapping end 22 of the tubular film 15 is sandwiched between the two auxiliary rollers 33 and the heating roller 32 with a predetermined pressure and heated. In addition, the position of the two auxiliary rollers 33 is adjusted so as to contact the same film portion, and by heating and pressurizing twice with respect to a predetermined portion of the film polymerization end 22 with time. It is sure to seal.
[0021]
As shown in FIGS. 2 and 3, the preheating device 31 injects hot air (warm air) onto the inner surface of the film polymerization end 22, that is, the bonding surface on both side edges of the tubular film 15, and the inner surface (adhesion). Surface). A specific configuration for realizing such a function is that the top end (upper end) is disposed in the film polymerization end 22 and the upper plate fixing nozzle 40 that separates both side edges (becomes the film polymerization end 22) of the tubular film 15 is used. And a hot air blower 41 disposed below the upper plate fixing nozzle 40 so as to be movable up and down, and a cylinder 42 for moving the hot air blower 41 up and down.
[0022]
The upper plate fixing nozzle 40 includes two inclined plates 44 which are connected at the upper end and are arranged so as to be separated from each other as they go downward. The inclined plate 44 has a large number of through holes 44a. The upper plate fixing nozzle 40 is connected via a connecting plate 29 to the lower surface of a conveyance path (plate) 28 through which the tubular film 15 that encloses the article to be packaged 20 is conveyed.
[0023]
Note that the two inclined plates 44 may be formed by bending the central portion of one flat plate, or of course, the upper ends of the two inclined plates 44 respectively prepared may be connected. Further, in this embodiment, the upper end is closed, but a part of the upper end may be opened. Furthermore, the entire upper end may be opened without connecting the two inclined plates 44 respectively prepared.
[0024]
However, as will be described later, since the hot air blown from the hot air blower 41 is supplied into the space between the two inclined plates 44, the hot air is guided to the outside of the upper plate fixing nozzle 40 from the through hole 44a. Then, hot air hits the film portion facing the inclined plate 44, that is, the inner surface of the film polymerization end 22 and is directly heated. Therefore, it is preferable that the upper end is closed because the hot air jetted upward is bent at the upper end portion of the inclined plate 44 and is smoothly guided to the outside from the through hole 44a of the inclined plate 44. Furthermore, for the same reason, it is more preferable to close the front and rear.
[0025]
The hot air blower 41 is equipped with a flat nozzle 45 at its upper end outlet. The flat nozzle 45 has a slit-like (elongated strip-like) opening, and the opening faces the upper plate fixing nozzle 40. That is, the direction in which the opening extends and the conveyance direction of the tubular film 15 are arranged in parallel.
[0026]
The hot air blower 41 is connected to the blower 47 through the hose 46. Thereby, the air sent out from the blower 47 reaches the hot air blower 41 through the hose 46, where it is heated to a predetermined temperature, and is blown from the flat nozzle 45 as hot air. Note that a temperature sensor is installed in the hot air blower 41, and the temperature of the hot air jetted by the temperature sensor is controlled to a desired value.
[0027]
Further, the tip of the cylinder rod 42a of the cylinder 42 is connected to the bottom surface of the hot air fan 41, and the cylinder 42 expands and contracts so that the position of the upper air outlet of the hot air fan 41 and thus the flat nozzle 45 can be adjusted. . Specifically, during operation, the cylinder rod 42 a of the cylinder 42 extends as shown in FIG. 3, and the upper end of the flat nozzle 45 is positioned in the upper plate fixed nozzle 40. As a result, the hot air jetted from the flat nozzle 45 is efficiently supplied into the space between the pair of inclined plates 44 of the upper plate fixed nozzle 40, the course is changed, and the outer side is changed from the through hole 44 a of the inclined plate 44. Be injected.
[0028]
On the other hand, when not in operation, the cylinder 42 contracts, and the tip of the cylinder rod 42a and thus the flat nozzle 45 moves downward. As a result, the upper end of the flat nozzle 45 waits below the upper plate fixing nozzle 44.
[0029]
According to this embodiment, the film overlapping end 22 on which both side edges of the tubular film 15 formed in a tubular shape passing through the bag making device 14 are sandwiched by the pinch roller 27 and receives a conveying force. . Thereby, the to-be-packaged object 20 is conveyed in the cylindrical film 15 in the state enclosed by the predetermined space | interval. This point is as described above.
[0030]
In the middle of the conveyance, the lower end side of the film polymerization end 22 is widened left and right by inserting the upper plate fixing nozzle 40 into the inner surface (inner contact surface). At this time, the hot air jetted from the hot air blower 41 is discharged from the flat nozzle 45 and supplied into the upper plate fixed nozzle 40. Then, the hot air which blows off from the through-hole 44a formed in the inclination board 44 of the upper board fixed nozzle 40 is blown off. Therefore, the blown hot air hits the inner surface of the film polymerization end 22 facing the inclined plate 44 of the upper plate fixing nozzle 40, heats the portion, and is preheated.
[0031]
In this way, the film polymerization end 22 in which the inner surface of the film is directly heated proceeds further as it is, and is heated and pressurized by the center seal device body 30. Then, since the contact surface of the heated / pressurized portion is preheated by the preheating device 31, the center seal device main body 30 is reliably heat-sealed without being heated at a very high temperature.
[0032]
【The invention's effect】
As described above, in the center seal device and the automatic packaging machine according to the present invention, the inner adhesive surface of the film polymerization portion is directly preheated, and then the preheated portion is heated and pressurized by the seal device main body. The center seal can be performed reliably and cleanly.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a pillow packaging machine to which a center seal device according to the present invention is applied.
FIG. 2 is a perspective view showing a preferred embodiment of a center seal device according to the present invention.
FIG. 3 is a front view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Band-shaped film 12 Original fabric roll 13 Tension roller 14 Bag making machine 15 Cylindrical film 16 Supply conveyor 20 Packaged article 21 Center seal apparatus 22 Film superposition end 24 End seal apparatus 25 Package 27 Pinch roller 28 Conveyance path (plate)
29 Connecting plate 30 Center seal device main body 31 Preheating device 32 Heating roller 33 Auxiliary roller 40 Upper plate fixing nozzle 41 Hot air machine 42 Cylinder 42a Cylinder rod 44 Inclined plate 44a Through hole 45 Flat nozzle 46 Hose 47 Blower

Claims (3)

A means for forming a continuous strip-shaped film into a cylindrical shape, a center seal device that seals the polymerization end of the cylindrical film formed in the cylindrical shape, and disposed downstream of the center seal device, The center seal device used in an automatic packaging machine provided with an end seal device that performs sealing and cutting in the width direction of the tubular film,
A sealing device main body for heat-sealing by sandwiching the overlapping ends;
A preheating device that is disposed upstream of the sealing device body and preheats a portion to be heat sealed by the sealing device body;
The preheating device, the polymerization end der heats the inner contact surfaces directly is, the tip is inserted into and arranged in the polymerization end, the upper plate fixing of separating both side edges of the tubular film is a polymer end A nozzle and a device for injecting hot air arranged to move up and down below the upper plate fixing nozzle;
The upper plate fixing nozzle includes an inclined plate having a through hole, and hot air sprayed from the hot air spraying device is sprayed to the inner contact surface of the overlapping end through the through hole. A center seal device characterized by that. 2. The flat nozzle having a strip shape with a narrow opening is attached to an outlet of the apparatus for injecting hot air, and the opening is opposed to the upper plate fixing nozzle. Center seal device. A means for forming a continuous strip-shaped film into a cylindrical shape, a center seal device that seals the polymerization end of the cylindrical film formed in the cylindrical shape, and disposed downstream of the center seal device, In an automatic packaging machine provided with an end seal device that performs sealing and cutting in the width direction of the tubular film,
3. The automatic packaging machine according to claim 1, wherein the center seal device has the configuration according to claim 1 or 2.

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