JP2002193218A - Method and device for shrinking film in film packaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film packaging apparatus which reduces mechanical space to 1/2 to 1/3 of that of a conventional device and has a small capacity of thermal source for shrinkage and which is capable of carrying out curing packaging. SOLUTION: The film shrinking method in the film packaging apparatus 1 comprises shielding or relieving a shrinking hot air to a product with mechanical shielding devices such as an air blow device and a hot air shielding plate, on the basis of operating electric signals when cross sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for shrinking a film in a film packaging apparatus for sealingly packing the surface of a product to be shipped.

[0002]

2. Description of the Related Art Conventionally, a general film packaging apparatus of this kind is divided into a packaging section and a shrinking section.
And the shrinking part is to shrink the whole uniformly by gradually increasing the temperature and passing it through the long tunnel, so the installation space of the opportunity is wide, and the heat source also has a large capacity to match the length of the tunnel. It required a heater. In view of this, the applicant of the present invention firstly shrinks the film by directly blowing hot air onto the sealing portion of the film to shorten the length of the tunnel as much as possible and reduce the amount of heat. 8-22
No. 6053).

[0003]

However, in the direct hot air blowing / shortening type film packaging apparatus of the tunnel portion, when the hot air blowing nozzle is arranged close to the apparatus for further energy saving, the progress is stopped. It has been discovered that when cross-sealing a film, there is a disadvantage that the film shrinks more than necessary. A film shrinking method and apparatus in a film packaging apparatus according to the present invention has been made in order to eliminate the inconvenience in performing the above-mentioned cross-sealing.

[0004]

According to the present invention, there is provided a film characterized in that when a cross-seal is performed, shrinking hot air is cut off or reduced by a mechanical shut-off device such as an air blow device or a hot air shut-off plate in connection with an operation electric signal. A method for shrinking a film in a packaging device.

[0005] The film shrinking device in the film packaging device comprises an operating electric signal device and a power device for performing the cross-sealing, and an air blow device for shutting off or mitigating the shrinking hot air in connection with the operating electric signal device. .

[0006] A film package comprising an operating electric signal device and a power device for performing a cross seal, and a mechanical shut-off device such as a hot air shut-off plate for intercepting or mitigating contracted hot air in connection with the operating electric signal device. In the film shrinking device in the device.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A film packaging apparatus characterized in that when performing cross-sealing, shrinking hot air is cut off or alleviated by a mechanical shut-off device such as an air blow device or hot air shut-off plate in connection with an operation electric signal. Film shrinking method.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a film packaging apparatus according to an embodiment of the present invention; FIG. A supply unit 4 for supplying the article 2 and supplying the half-fold roll film 3 to the packaged object 2 in the vertical direction, and a side seal unit 5
, A cross seal portion 6, a contraction portion 7, and an ear winding device 8
Consists of

The supply unit 4 is provided with an upper former 10a above the supply conveyor 9 and a lower former 10b below the supply conveyor 9, pulls out the half-fold roll film 3 which is pivotally supported below the supply unit 4, and pulls the tip of the film. Upper Former 1
0a and the lower former 10b, the upper former 10a and the lower former 10b invert the half-fold roll film 3, and are connected from above and below to the packaged goods 2 sent out by the supply conveyor 9, and supplied to the side seal portion 5. It is done. Although not shown, instead of the half-fold roll film 3, the roll-wrap film is supported in two stages and guided to the upper surface and the lower surface of the article 2 to be packaged and connected to each other, similarly to the half-fold roll film 3. It may be supplied to the side seal portion 5.

In the side seal portion 5, both side edges of the half-fold roll film 3 are sealed by heat welding, and, although not shown, the welded outer ears are cut off, and these ears are used as scum to form the ear rolls. It is to be wound around the take-up device 8.

The side seal portion 5 includes a left side seal portion 5a and a right side seal portion 5b, and the right side seal portion 5b shown in the drawing includes upper side pressing feed belts 11, 12 and lower side pressing feed belt 13, 14, a heat welding machine 15, a lug cutting rotary blade 16, and the like. Since the left side seal portion 5a has no side view in the drawing, it is only a plan view of FIG. 2, but has the same configuration as the right side seal portion 5b. The heat welding machine 15
Is appropriately selected from known means such as a high frequency type, an ultrasonic type and a hot air type. Although the adjustment lateral movement mechanism is omitted, for example, the right side seal portion 5b is fixed, and the left side seal portion 5a is laterally moved to adapt to the width and height of the packaged object 2 and the left side seal portion 5a. And the corresponding lateral width of the right side seal part 5b is provided.

Then, the article to be packaged 2 is sent to the cross seal section 6. Here, when the first delivery is performed, when the front end of the package 2 reaches the cross seal portion 6, the package 2
Is stopped, and the seal sword 6 above the cross seal portion 6 is stopped.
a, the lower end thereof is pressed against the lower seal base 6b, and the upper and lower surfaces of the half-fold roll-wrapped film 3 sandwiched by the seal sword 6a and the seal base 6b are welded in a required width band shape, and the middle of the weld seal portion. And the front end side of the half-fold rolled film 3 is cleaned. When the welding and the intermediate cutting are performed, the sealing sword 6a rises, and is ready for the next step of welding and intermediate cutting. Then, again, the side of the article to be packaged 2 is sent out while being welded, and when the rear end of the article to be packaged 2 has passed through the cross seal portion 6 as appropriate, this is detected by a photoelectric tube device (not shown), and this is detected. It is taken out as an electric signal, the feeding of the packaged object 2 is stopped, and the sealing knife 6a above the cross seal portion 6 is lowered again,
The lower end is pressed against the lower seal base 6b, the upper and lower surfaces of the half-fold roll film 3 sandwiched between the seal knife 6a and the seal base 6b are welded in a required width band shape, and the middle of the welded seal portion is cut. Folding roll film 3
The rear end side is removed. Then, this cross-seal processing is detected by an electric signal, and the seal sword 6a is raised to prepare for the next welding and intermediate cutting. The packaged object 2 packed is sent out.

In the embodiment of the present invention, since the cross seal portion 6 is provided at the entrance of the contraction portion 7, when passing through the cross seal portion 6, the article 2 and the packaged half-fold roll are wound. The film 3 enters the shrinking section 7, where the left side hot air nozzle 17 disposed on the left inner side in relation to the electric signal of the operation of the cross seal is provided.
And hot air from the right-side hot air nozzle 18 provided on the right inner side, so that when the feed is stopped for the above-mentioned cross-seal, the corresponding aspects of the left-side hot air nozzle 17 and the right-side hot air nozzle 18 are concentrated in hot air. In response to this, excessive contraction may occur, and in order to avoid this, FIG.
As shown in the embodiment shown in FIG. 1, the upper inner wall surface 7 is provided to the left side hot air nozzle 17 and the right side hot air nozzle 18 respectively.
a, a left side shutoff air nozzle 19 and a right side shutoff air nozzle 20 that are spaced inwardly from a.
The electromagnetic valve is opened by an electric signal at the time of the cross sealing, not shown, but the electromagnetic valve is opened, and the air of the compressor is released from the left side shutoff air nozzle 19 and the right side shutoff air nozzle 2.
The hot air of the left side hot air nozzle 17 and the right side hot air nozzle 18 is cut off or moderated.

As shown in FIG. 4, a blocking plate 21 for blocking hot air from the left side hot air nozzle 17 may be provided rotatably with respect to the left side blocking air nozzle 19. Although the embodiment is not shown, the same is true for the blocking plate for blocking the hot air from the right side hot air nozzle 18.

As shown in FIG. 5, an upper hot air nozzle 22 similar to the left side hot air nozzle 17 and the right side hot air nozzle 18 may be installed downward on the ceiling surface 7b of the shrinking portion 7. An upper shutoff air nozzle 23 may be provided laterally with respect to the upper hot air nozzle 22. Although not shown, a blocking plate may be provided for the upper blocking air nozzle 23 in the same manner as the blocking plate 21 for blocking the hot air from the left side hot air nozzle 17.

The left side hot air nozzle 17, right side hot air nozzle 18 and upper hot air nozzle 22 are of course connected to hot air blowers each comprising an air blower and a heater. The left hot air nozzle 17, the right hot air nozzle 18, and the upper hot air nozzle 22 are then blown by the left hot air nozzle 19, the right hot air nozzle 20, and the upper hot air nozzle 23.
It blows out compressor air and the like.

Reference numeral 24 denotes a discharge conveyor, which is shown in FIGS. 1 and 2 as a belt type. As shown in FIGS. 3, 4 and 5, a roller type roller conveyor 25 in which rollers are arranged at required intervals. But it is good.

The method and apparatus for shrinking a film in the film packaging apparatus 1 of the present invention are as described above.
In the process of transporting and discharging the product by a conveyor or the like to heat-shrink the package 2 in which the packaged material has been overlapped by a film such as heat-shrinkable PE (polyethylene), PP (polypropylene), or PVC (polyvinyl chloride) in the previous process. In this process, hot shrinkage is performed to perform continuous shrinkage.However, when the rear end of the object to be packed in the film packaging section in the previous process is stopped and cross-sealing is performed, the shrinking hot air that the object to be received is stopped and received is blown or blown. By blocking or relaxing with a blocking plate or the like, excessive heat is not applied to the wrapped film.

[0019]

As described above, the method and the apparatus for shrinking a film of a film packing apparatus according to the present invention are as described above, so that a packaging machine and a shrinking machine can be truly integrated with a conventional apparatus of this kind. The machine structure is simple, the machine space is reduced to 1/2 to 1/3, and the package is compact, and the shrinkable heater has a small capacity and can be packaged.

[Brief description of the drawings]

FIG. 1 is a side view of a film shrinking device of a film packaging device of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged sectional explanatory view of a first embodiment of a main part of the film shrinking device.

FIG. 4 is an enlarged sectional explanatory view of a second embodiment of a main part of the film shrinking device.

FIG. 5 is a partial cross-sectional view showing an embodiment in which an upper hot air nozzle and an upper shutoff air nozzle are provided on a ceiling surface of a shrinking portion of the film shrinking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film packing apparatus 2 Packaged material 3 Half-fold roll film 4 Supply part 5 Side seal part 5a Left side seal part 5b Right side seal part 6 Cross seal part 6a Seal knife 6b Seal stand 7 Shrinking part 7a Inner wall surface 7b Ceiling surface Reference Signs List 8 ear take-up device 9 supply conveyor 10a upper former 10b lower former 11 upper-side press feed belt 12 upper-side press feed belt 13 lower-side press feed belt 14 lower-side press feed belt 15 heat welding machine 16 ear cutting rotary blade 17 left Side hot air nozzle 18 Right side hot air nozzle 19 Left side shut-off air nozzle 20 Right side shut-off air nozzle 21 Shut-off plate 22 Upper hot air nozzle 23 Upper shut-off air nozzle 24 Discharge conveyor 25 Roller conveyor

Claims (3)

[Claims] 1. A film in a film packaging apparatus characterized in that when a cross-seal is performed, shrinking hot air is cut off or reduced by a mechanical shut-off device such as an air blow device or a hot air shut-off plate in connection with an operation electric signal. Shrinkage method. 2. A film shrinking device in a film packaging device comprising an operating electric signal device and a power device for performing a cross-sealing operation and an air blowing device for shutting off or reducing hot air shrinking in relation to the operating electric signal device. . 3. When the cross-seal is performed, the operation electric signal device and the power device are provided, and a mechanical shut-off device such as a hot air cut-off plate for intercepting or mitigating the contracted hot air in connection with the operation electric signal device. A film shrinking device in a film packaging device.