JPH09132211A - Method and device for shrink packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a shrink packaging without generating a film slipping, while uniformly shrinking the film around the whole body of an article by a method wherein one part only of a shrinkable film is heat-shrunk first by a heating device to fit on a certain part of the article, and then, the remaining part is heat-shrunk to fit the film on the whole body of the article. SOLUTION: The top and bottom of a shrinkable film 2 are heated by top and bottom hot air machines 12A, 12B of a heating device 11 while rotating an article 1 by an article rotating device to heat-shrink the top and bottom parts of the shrinkable film 2 first, and the shrinkable film 2 is fitted and fixed to the top and bottom parts of the article 1. Then, while the article 1 is rotated, the heating for the top and bottom parts of the shrinkable film 2 is continued, the central part of the shrinkable film 2 is heated while vertically reciprocating a central hot air machine 12C in the vertical direction of the article 1 to heat- shrink the central part of the shrinkable film 2. By this method, the shrinkable film 2 is stuck and fixed at the top and bottom parts of the article 1, and the film is prevented from slipping at the time of the heat-shrinking of the central part of the shrinkable film 2, which is performed after that.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink wrapping method and apparatus for articles such as compact disc (CD) stacks.

[0002]

2. Description of the Related Art Conventionally, as a method for shrinking an article, as shown in FIG. 7A, a tubular shrink film 2 is covered around an article 1 held on a stack pole 3 and the stack pole 3 is passed through a shrink tunnel. In some cases, the shrink film is heat-shrinked so that the shrink film is closely attached to the periphery of the article.

[0003]

In the prior art, hot air is circulated in the shrink tunnel, but the heat distribution around the article passing through the shrink tunnel is less likely to be uniform, and as a result, the heat shrinkage of the shrink film around the article occurs. The following deviations occur in the state.

When excessive heat is applied to the upper side in the vertical direction of the article, the shrink film shrinks to the upper side and the film drops off to the upper side (FIG. 7 (B)).

When excessive heat is applied to the lower side in the vertical direction of the article, the shrink film shrinks downward, causing the film to drop to the lower side.

When the heat to the upper side of the article is stronger than the heat to the lower side of the article (or vice versa), the shrinkage state of the shrink film around the article is biased to the upper side (or the lower side) (FIG. 7C). ).

An object of the present invention is to shrink-wrap a film uniformly around the entire article without causing a film shift around the article.

[0008]

According to a first aspect of the present invention, a tubular shrink film is covered around an article, and the shrink film around the article at a shrinking work position is heat-shrinked by a heating device to surround the article. In the shrink wrapping method, the heating device heat-shrinks only a part of the shrink film first to adhere it to a part of the article, and then the heating device heat-shrinks the rest of the shrink film to remove the entire article. It is intended to be attached to.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, after the upper and lower portions of the shrink film are first heat-shrinked by the heating device and fixedly attached to the upper and lower portions of the article. The heating device causes the central part of the shrink film to be thermally shrunk.

According to a third aspect of the present invention, in addition to the first aspect of the present invention, the central portion of the shrink film is first heat-shrinked by the heating device to be attached and fixed to the central portion of the article. The upper and lower parts of the shrink film are heat-shrinked by a heating device.

According to a fourth aspect of the present invention, in addition to the first aspect of the present invention, the upper and lower portions of the shrink film are first heat-shrinked by the heating device to lightly adhere to the upper and lower portions of the article. After that, the central part of the shrink film is heat-shrinked by the heating device, and finally the upper and lower parts of the shrink film are completely heat-shrinked by the heating device.

According to a fifth aspect of the present invention, a shrink wrapping device is provided which covers a tubular shrink film around an article, and heat shrinks the shrink film around the article at a shrinking work position by a heating device so that the shrink film is closely attached around the article. In the above, the heating device is arranged so as to face a part of the circumference of the article in the circumferential direction, and the article rotation device for rotating the article on the front surface of the heating device is provided.

According to a sixth aspect of the present invention, there is provided a shrink wrapping device which covers a tubular shrink film around an article and heat-shrinks the shrink film around the article at a shrinking work position by a heating device to bring the shrink film into close contact with the article. In the article supply conveyor that positions the article at the shrink standby position, an article separating device that transfers the article from the shrink standby position to the shrink working position by the heating device, and an article dispensing device that dispenses the article from the shrink working position. However, between the shrink standby position and the shrink work position, the heating device provided around the shrink work position does not reach the unshrinkable shrink film around the article at the shrink standby position and heat shrink the film. It is arranged such that a space is interposed.

According to a seventh aspect of the present invention, in addition to the sixth aspect of the present invention, the article separating device further comprises a first article transfer arm for transferring the article from the shrink standby position to the intermediate position. , A second article transfer arm for transferring the article from the intermediate position to the shrinking work position.

According to an eighth aspect of the present invention, there is provided a shrink wrapping device which covers a tubular shrink film around an article and heat-shrinks the shrink film around the article at a shrinking work position by a heating device so that the shrink wrap is closely attached around the article. In, the heating device provided around the shrink work position can be set to be switched between a heating standby position where heat is not applied to the shrink film and a heating work position where heat is applied to the shrink film to shrink the film. It is designed to be

According to the present invention described in claim 1, the following operational effects are obtained. It is possible to position and fix the shrink film with respect to the article by first thermally shrinking only a part of the shrink film covered around the article and attaching the shrink film to the article. As a result, the shrink film is positioned and fixed around the article, and the rest is heat-shrinked, so that the film can be uniformly shrink-wrapped around the article without causing the film shift due to the positioning and fixing effect.

According to the second aspect of the present invention, the following operational effects can be obtained. By heat-shrinking the upper and lower parts of the shrink film first, the shrink film is positioned and fixed to the upper and lower parts of the article, and it is possible to prevent the film displacement during the subsequent heat shrink of the central part.

According to the present invention described in claim 3, the following operational effects are obtained. By heat-shrinking the central part of the shrink film first, the shrink film is positioned and fixed to the central part of the article, and it is possible to prevent the film displacement during the subsequent thermal shrinkage of the upper and lower parts. In this case, the central part of the shrink film is in close contact with the central part of the article first, and then the upper and lower parts are in close contact with the upper and lower parts of the article, and the air in the shrink film is central as the shrinkage of the shrink film progresses. It is reliably discharged from the side to the outside through both upper and lower ends. That is, the air in the shrink film can be surely discharged to the outside, and the shrink film can be closely adhered to the periphery of the article.

According to the present invention described in claim 4, there are the following operational effects. By lightly shrinking the upper and lower parts of the shrink film first, the shrink film is positioned and fixed to the upper and lower parts of the article, preventing the film from slipping during the subsequent heat shrinkage of the center part, and finally completely heating the upper and lower parts. Contract. In this case, the upper and lower parts of the shrink film are lightly applied to the upper and lower parts of the article so that they do not come into close contact (there is an air escape path), and then the central part of the shrink film comes into close contact with the central part of the product, and then the upper and lower parts. The parts are in close contact with the upper and lower parts of the article, and the air in the shrink film is surely discharged to the outside from the central side through the air escape paths at the upper and lower ends as the shrinkage of the shrink film progresses.
That is, the air in the shrink film can be surely discharged to the outside so that the shrink film can be closely adhered to the periphery of the article.

According to the present invention described in claim 5, the following operational effects are obtained. The heating device is arranged so as to face a part in the circumferential direction around the article,
By causing the article to rotate on the front surface of the heating device, the shrink film can be heat-shrinked around the article without providing a heating device that surrounds the entire article. Thereby, the shrink packaging device can be made compact.

According to the present invention described in claims 6 and 7, there are the following operational effects. The article separating device transfers the article from the shrink standby position to the shrink work position by the heating device, and the heating device provided around the shrink work position is provided between the shrink standby position and the shrink work position. The non-shrinkable shrink film around the article in FIG. Therefore, in a shrink wrapping device that continuously shrink-wraps a large number of articles, the shrink film can stand by at the shrink standby position without causing any thermal deformation, and as a result, heat can be applied for the first time at the shrink work position. The heat can be uniformly shrunk around.

According to the present invention described in claim 8, the following operational effects are obtained. The heating device is switched between a heating standby position where heat is not applied to the shrink film and a heating work position where heat is applied to the shrink film to shrink the film. Therefore, the heating device does not exert the heat on the shrink film even if it is set to the ON (heat generation) state at the heating standby position. Accordingly, the heating device can continue to be in the ON state at both the heating standby position and the heating work position. That is, since the heating device can be continuously operated (compared to the case where the heating device is repeatedly turned on / off), when the heating device is set to the heating work position, heat of constant temperature (hot air) is always applied to the shrink film. As a result, the shrink film can be uniformly heat-shrinked around the article.

[0023]

1 is a schematic view showing an example of a shrink wrapping method, FIG. 2 is a schematic view showing a first mode of the shrink wrapping method, and FIG. 3 is a schematic view showing a second mode of the shrink wrapping method. FIG. 4 is a schematic diagram showing the third mode of the shrink wrapping method, FIG. 5 is a schematic diagram showing an example of the shrink wrapping apparatus, FIG. 6 is a detailed view of essential parts of FIG. 5, and FIG. 7 is a schematic diagram showing a conventional method. .

(Shrink packaging method) (FIGS. 1 to 4) In FIG. 1, 1 is an article, 2 is a shrink film, and 3 is a shrink film.
Is a stack pole, 11 is a heating device, and 21 is an article rotating device.

The article 1 is, for example, a CD integrated body, and is inserted and held in the stack pole 3. Shrink film 2
Is made of, for example, polyethylene, polypropylene, PVC, or the like, and has a cylindrical shape that is wrapped around the article 1 and is heat-shrinked by the heating device 11 so as to be closely attached to the article 1.

In the heating device 11, an upper hot air blower 12A, a lower hot air blower 12B, and a central hot air blower 12C are vertically arranged side by side.
It is possible to move vertically between the lower hot air blower 12B and the lower hot air blower 12B. The upper hot air fan 12A and the lower hot air fan 12B are fixedly arranged in the vertical direction around the article 1. The hot air blowers 12A to 12C send hot air, for example, by sending air from the back surface of the heat transfer heater toward the front.

The article rotating device 21 has a turntable 23 installed at a shrinking work position and driven by a motor 22. The stack pole 3 carried on the turntable 23 is rotated, and as a result, the article 1 is heated. Rotate on the front of the device 11. As a result, the shrink film 2 around the article 1 can be heated in the circumferential direction by the hot air blowers 12A to 12C of the heating device 11.

Therefore, the heating device 11 first heat-shrinks only a part of the shrink film 2 covered around the article 1 to adhere it to a part of the article 1, and then heat-shrinks the rest. Then, the shrink film 2 is applied to the entire article 1. Specifically, the following (A)
It depends on one of the three modes of (C).

(A) First mode (FIG. 2) (1) While rotating the article 1 by the article rotating device 21, the upper and lower parts of the shrink film 2 are heated by the hot air blowers 12A and 12B above and below the heating device 11. This is first heat-shrinked, and the shrink film 2 is adhered and fixed to the upper and lower parts of the article 1 (FIG. 2 (A)).

(2) While rotating the article 1 by the article rotating device 21, the hot air blowers 12A and 12B above and below the heating device 11 are rotated.
Thus, the upper and lower parts of the shrink film 2 are continuously heated, and the central hot air blower 12C of the heating device 11 heats the central part of the shrink film 2 to heat-shrink it (FIG. 2 (B)). At this time, the central hot air blower 12C is vertically reciprocated along the vertical direction of the article 1 between the upper hot air blower 12A and the lower hot air blower 12B by the lifting cylinder 13.

According to this first mode, the following operational effects are obtained. By shrinking the upper and lower parts of the shrink film 2 first, the shrink film 2 becomes an article 1.
The film is positioned and fixed on the upper and lower parts of the film, and it is possible to prevent the film from slipping when the central part is subsequently heat-shrunk.

(B) Second mode (FIG. 3) (1) While rotating the article 1 by the article rotating device 21, the central part of the shrink film 2 is heated by the central hot air blower 12C of the heating device 11 to move it forward. Heat-shrinked into article 1
The shrink film 2 is attached and fixed to the central portion of the
(A)).

(2) While the article 1 is rotated by the article rotating device 21, the central portion of the shrink film is continuously heated by the central hot air blower 12C of the heating device 11, and the hot air blowers 12A and 12B above and below the heating device 11 are used. The upper and lower parts of the shrink film 2 are heated to cause heat shrinkage (FIG. 3 (B)). At this time, the central hot air blower 12C is vertically reciprocated along the vertical direction of the article 1 between the upper hot air blower 12A and the lower hot air blower 12B by the lifting cylinder 13.

According to the second mode, the following operational effects are obtained. By shrinking the central portion of the shrink film 2 first by heat, the shrink film 2 is formed into the article 1.
The film is positioned and fixed in the central part of the, and the film shift can be prevented when the upper and lower parts are thermally contracted. In this case, the central part of the shrink film 2 is in close contact with the central part of the article 1 first, and then the upper and lower parts are in close contact with the upper and lower parts of the article 1, and the air in the shrink film 2 is the heat of the shrink film 2. As the contraction progresses, it is reliably released to the outside from the center side through both upper and lower ends. That is, the air in the shrink film 2 can be surely discharged to the outside, and the shrink film 2 can be closely adhered to the periphery of the article 1.

(C) Third mode (FIG. 4) (1) While rotating the article 1 by the article rotating device 21, the upper and lower parts of the shrink film 2 are lightly heated by the hot air blowers 12A and 12B above and below the heating device 11. Then, this is lightly shrunk first, and the shrink film 2 is lightly applied to the upper and lower parts of the article 1 (FIG. 4A).

(2) While the article 1 is rotated by the article rotating device 21, the central portion of the shrink film 2 is heated by the central hot air blower 12C of the heating device 11 to heat-shrink it (FIG. 4 (B)). At this time, the central hot air blower 12C is vertically reciprocated along the vertical direction of the article 1 between the upper hot air blower 12A and the lower hot air blower 12B by the lifting cylinder 13.

(3) While rotating the article 1 by the article rotation device 21, the central portion of the shrink film 2 is continuously heated by the central hot air blower 12C of the heating device 11, and the hot air blowers 12A and 12B above and below the heating device 11 are continuously heated. Then, the upper and lower parts of the shrink film 2 are heated to completely shrink heat (FIG. 4 (C)). At this time, the central hot air blower 12C uses the lifting cylinder 13 to move the upper hot air blower 12A and the lower hot air blower 12A.
Between B, the article 1 is reciprocated in the vertical direction along the vertical direction.

According to this third mode, the following operational effects are obtained. By lightly shrinking the upper and lower parts of the shrink film 2 first, the shrink film 2 is positioned and fixed to the upper and lower parts of the article 1, and the film shift during the subsequent heat shrinking of the central part is prevented, and finally the upper and lower parts are fixed. Heat shrink completely. In this case, shrink film 2
The upper and lower parts are lightly adhered to the upper and lower parts of the article 1 so that they do not come into close contact (there is an air escape path), and then the central part of the shrink film 2 comes into close contact with the central part of the article 1, and subsequently the upper and lower parts are The air in the shrink film 2 is in close contact with the upper and lower parts of the article 1, and is reliably discharged to the outside from the center side through the air escape paths at the upper and lower ends as the shrinkage of the shrink film 2 progresses. That is, the air in the shrink film 2 can be surely discharged to the outside, and the shrink film 2 can be closely adhered to the periphery of the article 1.

(Shrink Wrapping Machine) (FIGS. 5 and 6) As shown in FIGS. 5 and 6, the shrink wrapping machine 10 includes a heating device 11, an article rotating device 21, and an article supply conveyor 3.
1, an article separating device 41, an article dispensing device 51, and an article discharging conveyor 61.

The heating device 11 is composed of the hot air blowers 12A to 12C at the above and below center (FIG. 6).

The upper and lower hot air blowers 12A and 12B are fixed to the upper and lower two positions of the support rod 14, respectively.
A can be arranged so as to partially oppose the upper part of the article 1 in the circumferential direction, and the lower hot air fan 12B can be arranged so as to oppose a part of the lower part of the article 1 in the circumferential direction. And the hot air blowers 12A, 12
The support rod 14 to which B is fixed is a cylinder 15,
The rocking lever 16 can be rocked. Thereby, the hot air blowers 12A and 12B are (a) the article rotating device 2
1. A heating standby position set on the turntable 23 of No. 1 where hot air is not applied to the shrink film 2 around the article 1; and (b) Heating for applying hot air to the shrink film 2 to cause the film 2 to shrink around the article 1 The work position can be switched and set.

The central hot air blower 12C is fixed to the lift table 17 so that it can be disposed so as to face a part of the center of the article 1 in the circumferential direction, and the lift cylinder 13 moves the lift table 17 up and down. It can move up and down. The central hot air blower 12C includes the cylinder 18 and the swing lever 1.
(A) a heating standby position that does not apply hot air to the shrink film 2 around the article 1 that is set on the turntable 23 of the article rotation device 21;
(b) The shrink film 2 can be switched and set to a heating work position where hot air is applied to the shrink film 2 so as to shrink the film 2 around the article 1.

The article rotating device 21 includes the motor 22 described above.
It has a turntable 23 driven by (FIG. 6). The turntable 23 is set at a shrink work position B described later.

The article supply conveyor 31 continuously positions the stack pole 3 supporting the article 1 and the shrink film 2 at the shrink standby position A.

The article separating device 41 transfers the stack pole 3 from the shrink standby position A on the article supply conveyor 31 to the shrink work position B (turntable 23) by the heating device 11. The article separating device 41 includes a first article transfer arm 42 that transfers the stack pole 3 from the shrink standby position A to the intermediate position M, and a second article transfer arm 42 that transfers the stack pole 3 from the intermediate position M to the shrink work position B. And an article transfer arm 43. The first article transfer arm 42 is reciprocally moved in a lateral right angle direction of the article supply conveyor 31 by a cylinder (not shown), and the stack pole 3 on the article supply conveyor 31 is scraped to the intermediate position M side by the stack pole gripper 42A. It is possible to reprint. The second article transfer arm 43 reciprocates in the direction parallel to the article supply conveyor 31 by the cylinder 44, and the stack pole 3 transferred to the intermediate position M by the first article transfer arm 42 is turned by the article rotation device 21. Table 23 (shrink work position B)
Transfer is possible as if pushing it up. As a result, the article separating device 41 causes the heating device 11 provided around the shrink work position B between the shrink standby position A and the shrink work position B to be uncontracted around the article 1 at the shrink wait position A. An interval is provided so that the shrink film 2 does not shrink due to heat.

The article dispensing device 51 transfers the stack pole 3 from the shrink work position B on the turntable 23 to the article discharge position C on the article discharge conveyor 61. The article dispensing device 51 moves the stack pole 3 from the shrink work position B to the first article transfer arm 4 of the article separating device 41 described above.
It has a third article transfer arm 52 which is transferred so as to be pushed into the stack pole grip portion 42B provided in the second item. Third
The article transfer arm 52 reciprocates in the direction parallel to the article supply conveyor 31 by the cylinder 53. Goods delivery device 5
First, the stack pole 3 transferred to the stack pole grip portion 42B of the first article transfer arm 42 by the third article transfer arm 52 is moved from the intermediate position M of the first article transfer arm 42 to the shrink standby position A. By the returning operation of, the article is discharged to the article discharge position C on the article discharge conveyor 61.

The article discharge conveyor 61 discharges the article 1 shrink-wrapped at the shrink work position B together with the stack pole 3 to the lower process.

Therefore, the shrink wrapping device 10 has the following structure.
Perform shrink wrapping as in (1) to (5). (1) The stack pole 3 supporting the article 1 is positioned at the shrink standby position A by the article supply conveyor 31. At this time, the shrink film 2 is covered around the article 1.

(2) The stack pole 3 positioned at the shrink standby position A is transferred to the intermediate position M by the first article transfer arm 42 of the article separating device 41 and further moved by the second article transfer arm 43. Transfer to the shrink work position B (turntable 23).

(3) Using the heating device 11 and the article rotating device 21, the first to third modes of the shrink wrapping method described above.
One of the modes (FIGS. 2 to 4) is performed. As a result, the shrink film 2 is heat-shrinked around the article 1 and brought into close contact therewith, and the shrink wrapping is completed.

(4) The stack pole 3 which has been shrink-wrapped at the shrink work position B (turntable 23) is transferred to the third article transfer arm 52 of the article dispensing device 51.
Is transferred to the stack pole grip portion 42B of the first article transfer arm 42, and is then delivered to the article ejection position C on the article ejection conveyor 61 by the first article transfer arm 42.

(5) The stack pole 3 is discharged to the lower step by the article discharge conveyor 61, and the shrink-wrapped article 1 is removed from the stack pole 3.

Therefore, the shrink wrapping device 10 has the following operational effects. The heating device 11 surrounds the whole of the article 1 by arranging the heating device 11 so as to face a part of the circumference of the article 1 in the circumferential direction and causing the article 1 to rotate on the front surface of the heating device 11.
The shrink film 2 can be heat-shrinked around the article 1 without providing the above. Thereby, the shrink wrapping device 10 can be made compact.

The article separating device 41 transfers the article 1 from the shrink standby position to the shrink work position by the heating device 11, and is provided around the shrink work position between the shrink standby position and the shrink work position. The heating device 11 is arranged so as to interpose an interval that does not cause the film to heat-shrink by reaching the unshrinkable shrink film 2 around the article 1 at the shrink standby position.
Therefore, in the shrink wrapping device 10 that continuously shrink-wraps a large number of articles 1, the shrink film 2 can stand by at the shrink stand-by position without any thermal deformation, and as a result, heat can be applied for the first time at the shrink work position. The film 2 can be uniformly heat-shrinked around the article 1.

The heating device 11 uses the shrink film 2
The heating standby position in which heat is not applied to the shrink film 2 and the heating work position in which heat is applied to the shrink film 2 to shrink the film are switched and set. Therefore, the heating device 11 does not exert the heat on the shrink film 2 even if the heating device 11 is set to the ON (heat generation) state at the heating standby position. Accordingly, the heating device 11 can continue to be in the ON state at any of the heating standby position and the heating work position. That is, since the heating device 11 can be continuously operated (compared to the case where the heating device 11 is repeatedly turned on / off), when the heating device 11 is set to the heating work position, heat (hot air) having a constant temperature is always shrunk. It can be applied to the film 2 and as a result the shrink film 2 can be uniformly heat shrunk around the article 1.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the gist of the present invention. Etc. are included in the present invention. For example, in the present invention, the heating device is not limited to the hot air blower. Further, the heating device is not divided like the hot air blowers 12A to 12C at the upper and lower centers and may be configured as a single body, or may be configured by installing a large number of heating devices continuously in the vertical direction.

Further, in the present invention, the heating device may be provided so as to surround the entire circumference of the article. At this time, it is not necessary to rotate the article on the front surface of the heating device.

[0058]

As described above, according to the present invention, the film can be uniformly shrink-wrapped around the article without causing the film shift around the article.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a shrink wrapping method.

FIG. 2 is a schematic diagram showing a first mode of the shrink wrapping method.

FIG. 3 is a schematic diagram showing a second mode of the shrink wrapping method.

FIG. 4 is a schematic diagram showing a third mode of the shrink wrapping method.

FIG. 5 is a schematic diagram showing an example of a shrink wrapping device.

FIG. 6 is a detailed view of a main part of FIG.

FIG. 7 is a schematic diagram showing a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 article 2 shrink film 10 shrink wrapping apparatus 11 heating apparatus 21 article rotating apparatus 31 article supply conveyor 41 article separating apparatus 42 first article transfer arm 43 second article transfer arm 51 article dispensing apparatus A shrink standby position B shrink work position

Claims (8)

[Claims] 1. A shrink wrapping method in which a tubular shrink film is covered around an article, and the shrink film around the article at a shrinking work position is heat-shrinked by a heating device so that the shrink film is closely attached around the article. A shrink wrapping method, characterized in that only a part of the shrink film is first heat-shrinked to be adhered to a part of the article, and the rest of the shrink film is heat-shrinked by a heating device to be adhered to the whole article. 2. The shrink according to claim 1, wherein the upper and lower parts of the shrink film are first heat-shrinked by the heating device to be adhered and fixed to the upper and lower parts of the article, and then the central part of the shrink film is heat-shrinked by the heating device. Packaging method. 3. The shrink film according to claim 1, wherein the heating device first heat-shrinks the central portion of the shrink film to adhere and fix the shrink film to the central portion of the article, and then the heating device heat-shrinks the upper and lower portions of the shrink film. Packaging method. 4. The heating device causes the upper and lower parts of the shrink film to heat-shrink first to lightly adhere to the upper and lower parts of the article, and then the heating device causes the central part of the shrink film to heat-shrink and finally heat. The shrink wrapping method according to claim 1, wherein the upper and lower portions of the shrink film are completely heat-shrinked by the device. 5. A shrink wrapping device which covers a tubular shrink film around an article, and shrinks the shrink film around the article at a shrinking work position by a heating device to bring the shrink film into close contact with the article. A shrink wrapping device, characterized in that it is provided with an article rotating device that is arranged so as to face a part of the circumferential direction and that rotates the item on the front surface of the heating device. 6. A shrink wrapping device which covers a tubular shrink film around an article, and shrinks the shrink film around the article at a shrinking work position by a heating device to bring the article into close contact with the shrink wrapping position. It has an article supply conveyor to be positioned, an article separating device that transfers the articles from the shrink standby position to the shrink work position by the heating device, and an article dispensing device that dispenses the articles from the shrink work position. The shrink standby position and the shrink work Between the position and the position, a heating device provided around the shrinking work position has an interval between the shrinking film and the unshrinkable shrink film around the article at the shrink standby position so that the film does not heat shrink. Characteristic shrink packaging equipment. 7. The first article transfer arm for transferring the article from the shrink standby position to the intermediate position and the second article transfer arm for transferring the article from the intermediate position to the shrinking work position in the article separating device. The shrink wrapping apparatus according to claim 6, comprising: 8. A shrink wrapping device which covers a tubular shrink film around an article, and shrinks the shrink film around the article at a shrinking work position by a heating device to bring the shrink film into close contact with the article. The shrinking device is capable of switching between a heating standby position where heat is not applied to the shrink film and a heating operation position where heat is applied to the shrink film to shrink the film by shrinking. Packaging equipment.