JP3252254B2 - Film shrinking equipment for packaging goods - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for heating and shrinking a film of a packaged article, and more particularly, to an apparatus packed in a heat shrinkable film (shrink film) in a heating tunnel while being sandwiched between upper and lower conveyors. And a film heating and shrinking device that shrinks the film to bring the film into close contact with an article.

[0002]

2. Description of the Related Art Heated air is blown onto an article packaged using a heat-shrinkable film, and the film is shrunk to produce a packaged article in close contact with the article. When using a film with a required print pattern as a heat-shrinkable film, the film on the upper surface of the article corresponding to the printed portion is prevented from being exposed to the heated air, thereby preventing the shrinkage of the film on the upper surface of the article and preventing the shrinkage of the packaged article. Distortion, deformation, and the like of the printed pattern located on the upper surface are minimized to prevent a reduction in commercial value.

For example, in a heat shrink wrapping apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 54-28655, a packaged article is provided between a lower conveyor having air permeability and running horizontally inside a first heating tunnel and the lower conveyor. Is provided so as to run freely. Then, the covering conveyor is pressed against the upper surface of the packaged article placed on the lower conveyor, and the article is conveyed to the downstream side in a state where the heated air does not come into contact with the film on the upper surface of the article. Then, only the film facing the bottom surface is heated and shrunk to suppress distortion, deformation, and the like of the printed pattern of the film located on the top surface of the packaged article.

[0004]

In the heat shrink wrapping apparatus, since the article pressing and opening portion (downstream end) of the covering conveyor is set so as to shift upward from a state parallel to the lower conveyor, When a packaged article placed and conveyed on the lower conveyor moves downstream from the article pressing and opening portion of the coating conveyor, the pressing force of the conveyor is suddenly released. For this reason, especially at the time of high-speed conveyance, in the case of an unstable packaged article such as a stacked article or an article having a small bottom area and a high height, there is a problem that the article is overturned at the article pressing open end of the covering conveyor.

[0005] If the film is not thermally shrunk by pressing the coating conveyor against the packaged article, the unshrinkable film may be loosened or may be damaged without obtaining sufficient strength. There are drawbacks. Therefore, in the heat shrink wrapping apparatus, another second heating tunnel is disposed downstream of the first heating tunnel for heating the side and bottom surfaces of the packaged article, and in the second heating tunnel, a coating conveyor is pressed on the top face of the packaged article. By transporting the article without attaching,
The entire package including the upper surface of the packaged article is reheated to eliminate the unshrinked portion of the heat-shrinkable film. However, in this case, it is necessary to install two heating tunnels, and there is a problem that the apparatus becomes large and the manufacturing cost increases.

In the heat shrink wrapping apparatus, when changing the shrinking condition of the heat shrinkable film in response to a change in the size of the article due to a change in product type, the heating temperature, the amount of heated air blown out of the air jet port, and the like. However, it was difficult to adjust the shrinkage condition by changing these conditions depending on the material of the film and the shape of the article.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems inherent in the prior art described above, and has been proposed in order to suitably solve the problems, and is intended to prevent an unstable packaged article from falling over. Packaged articles that can be obtained and that good packaging can be performed while suppressing an increase in the size of the apparatus and increase in manufacturing cost, and that can also arbitrarily adjust shrinkage conditions in response to a change in the type of packaged articles and the like. It is an object of the present invention to provide a film heat shrinking device.

[0008]

[MEANS FOR SOLVING THE PROBLEMS]
In order to suitably achieve the intended purpose, the present invention provides a heating tunnel in which an inlet and an outlet are formed, and directing the inside of the heating tunnel from the inlet to the outlet with the article wrapped with the heat-shrinkable film placed thereon. A lower heat conveyor for conveying, wherein the heat shrinkable film of the packaged article conveyed by the lower conveyor is shrunk while being conveyed in the heating tunnel so as to be in close contact with the article. An upper belt conveyor is movably disposed above the lower conveyor with the article transfer line interposed therebetween, and the upper belt conveyor has an article holding surface facing the article mounting surface of the lower conveyor in the upper belt. From the upstream position to the downstream side of the article transport direction from the entrance of the heating tunnel.
It runs parallel to the article placement surface of the lower conveyor to the position near the exit side, and the article upper surface heating prevention area capable of nipping and transporting the packaged article between the lower conveyor and the article holding surface of the upper belt. Overturn the packaged article from the required position on the upstream side in the article transport direction to the downstream side from the exit of the heating tunnel.
An article upper surface pinching release area is provided which travels so as to gradually separate from the upper surface of the packaged article placed on the lower conveyor at a tilt angle that can be prevented .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of a film shrinking apparatus for a packaged article according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a film heating and shrinking apparatus 10 according to an embodiment includes a packaged article 14 conveyed from a discharge conveyor (neither is shown) of a packaging machine on the upstream side in the article conveying direction to an apparatus main body 12. And a lower transport conveyor 16 that transports the packaged articles 14 to a transport conveyor (not shown) connected downstream in the article transport direction. The lower conveyor 16 is provided with a heat-resistant lower endless belt 18 made of fluororesin or the like so that it can run freely. The article mounting surface of the belt 18 holds the article 14 packaged with the heat-shrinkable film. The film on the bottom side of the article 14 is also formed into a mesh shape so that it is heated when the article 14 is conveyed. A heating tunnel 20 for heating the article 14 wrapped with the heat-shrinkable film and shrinking the film over a required range of the article transport section from the upstream side to the downstream side of the lower transport conveyor 16 is provided in the apparatus main body 12.
It is provided in.

The heating tunnel 20 has an inlet 20a formed on the upstream side in the article conveying direction and an outlet 2a formed on the downstream side.
0b is formed, and the lower endless belt 18 of the lower conveyor 16 is configured to travel horizontally to the upstream side of the entrance 20a and the downstream side of the exit 20b. Air heated by a heater is blown out of a plurality of outlets (none of which are shown) into the heating tunnel 20, and the heated air is forcibly circulated by a plurality of fans 22, whereby the packaged article 14 is heated. The side and bottom are heated.

As shown in FIG.
A pair of support frames 24, 24 formed in a rectangular frame shape are spaced from each other in the width direction across the article transport line so as to be vertically adjustable via height adjustment means 26. In addition, as shown in FIG. 1, the lower horizontal rod 24a of each support frame 24 faces inside from the entrance 20a to the exit 20b of the heating tunnel 20, and is configured to move up and down in the tunnel 20. . Both support frames 24,2
4, a plurality of guide rollers 28a to 28g are rotatably disposed, and the guide rollers 28a to 28g
The upper endless belt 30 is wound around 8 g to form an upper belt conveyor 32, and the packaged article 14 is conveyed between the upper endless belt 30 and the lower endless belt 18 while being sandwiched from above and below. I have. The upper endless belt 30 is formed of a heat-resistant material made of fluororesin or the like, and the article holding surface of the lower endless belt 18 facing the article mounting surface presses the entire upper surface of the packaged article 14. It is formed in a planar shape that can be used.

An inlet guide roller 28g located further upstream than the inlet guide roller 28a located upstream of the inlet 20a of the heating tunnel 20 is disposed at a higher position, and is located between the rollers 28a and 28g. The article holding surface of the located upper endless belt 30 is configured to incline upward toward the upstream side. Thereby, the packaged articles 14 conveyed from the discharge conveyor of the packaging machine can be stably sandwiched between the upper belt conveyor 32 and the lower conveyor 16. Further, since the entrance-side guide roller 28a is located on the upstream side of the entrance 20a of the heating tunnel 20, the packaged article 14 is introduced into the tunnel while being reliably sandwiched by the upper and lower conveyors 32,16.

As shown in FIG. 1, a fulcrum guide roller 28b rotatably supported at a position near the exit side of the lower horizontal rods 24a facing the heating tunnel 20 of the support frames 24, 24, as shown in FIG. The entrance side guide roller 2
8a is set to the same horizontal level as that of both guide rollers 28.
The article holding surface of the upper endless belt 30 located between a and 28b is set so as to face in parallel with the article placement surface of the lower endless belt 18 of the lower conveyor 16. The upper endless belt is placed on the upper surface of the packaged article 14 placed on the lower endless belt 18 in the article upper surface heating prevention area where the article holding surface of the upper endless belt 30 faces parallel to the article placement surface of the lower endless belt 18. 30 is configured to be pressed to prevent heated air from contacting the heat shrink film. The upper endless belt 30 is set to have a width (more than a length in a direction intersecting the conveying direction of the upper surface of the packaged article) that can cover the entire upper surface of the packaged article 14, The entire surface of the shrink film is heated by the heated air so as not to shrink.

As shown in FIG. 2, the height adjusting means 26 has a plurality of screw shafts 36 which are screwed correspondingly to a plurality of nuts 34 provided on each support frame 24. Are configured to rotate in a required direction in conjunction with the forward / reverse rotation of one handle 38. That is, by rotating the handle 38 in the forward and reverse directions, the support frame 24,
The position of the upper belt conveyor 32 is adjusted in the vertical direction together with the position of the upper endless belt 24, and the article holding surface of the upper endless belt 30 facing the article upper surface heating inhibition area and the article holding surface of the lower endless belt 18 of the lower transport conveyor 16. The interval changes. Then, the article holding surface of the upper endless belt 30 is placed on the lower endless belt 18 and the heating tunnel 20.
By positioning the packaged article 14 at a height that can be pressed against the upper surface of the packaged article 14 conveyed inside, the packaged article 14 passes through the heating tunnel 20 in a state where the packaged article 14 is sandwiched between the belts 18 and 30 from above and below in the article upper surface heating inhibition region. It is designed to be transported.

The outlet side guide roller 28c disposed downstream of the outlet 20b of the heating tunnel 20 in the support frames 24, 24 is provided with the fulcrum guide roller 28.
The article holding surface of the upper endless belt 30 which is set so as to be higher than the arrangement level of b and is located between the guide rollers 28b and 28c is configured to incline upward toward the downstream side. That is, in the article upper surface nipping release area where the article nipping surface of the upper endless belt 30 is inclined upward, the nipping state of the packaged article 14 by the upper belt conveyor 32 and the lower transport conveyor 16 is gradually released, and even during high-speed transportation. The packaged article 14 can be prevented from falling over.

The upper endless belt 30 facing between the fulcrum guide roller 28b and the exit-side guide roller 28c (the area for holding and releasing the upper surface of the article) has an angle of inclination adjusted by an angle adjusting means 40 shown in FIGS. It is configured to be changeable within a range where the falling of the packaged article 14 can be prevented. That is,
The angle adjusting means 40 includes a pair of swing arms 4 which protrude from both ends in the axial direction of the fulcrum guide roller 28b and are rotatably supported by support shafts 42 provided on the support frames 24, 24.
And an upper endless belt 30 facing the article upper surface nipping release area at a substantially middle position in the longitudinal direction of the arms 44, 44.
An adjusting roller 46 that comes into contact with the roller from above is rotatably pivotally supported. A link bar 50 is rotatably supported at the open end of each swing arm 44 via a support pin 48, and the other end of each link bar 50 is connected to a support shaft 52 by a support shaft 52.
Is connected to one end of an adjustment handle 54 which is rotatably supported via a pin. One end of a positioning lever 56 is pin-connected to the other end of the adjustment handle 54, and the positioning lever 56 has an elongated hole 56a. A fixing screw 60 that is screwed into a projecting piece 58 protruding from the support frame 24 is inserted into the elongated hole 56a,
The positioning lever 56 is configured to be positioned and fixed by tightening the fixing screw 60. That is, if the adjusting handle 54 is rotated upward or downward in the forward / reverse direction with the fixing screw 60 loosened, the adjusting roller 46 moves in the vertical direction via the link bar 50 and the swing arm 44. Thus, the inclination angle of the upper endless belt 30 facing the article upper surface holding release area can be changed.
Then, when tightened fixing screws 60 after the regulatory, adjusting roller 46 is held stationary.

When the inclination angle of the upper endless belt 30 is changed, for example, a guide roller 28f constituting the upper belt conveyor 32 is moved and adjusted, so that a required tension is always applied to the upper endless belt 30. It is configured as follows. It is also possible to provide a tension roller separately, and to adjust the tension of the upper endless belt 30 by the tension roller.

[0019]

Next, the operation of the apparatus for heating and shrinking film of a packaged article according to the above-described embodiment will be described. Prior to the operation of the apparatus 10, the upper endless belt 30 facing the article upper surface heating prevention area of the upper belt conveyor 32 is vertically adjusted by the height adjusting means 26 so that the upper endless belt 30 and the lower endless belt 18 of the lower transport conveyor 16 are adjusted. Packaged goods 1 between
4 is positioned at a height capable of being pinched. The position of the adjusting roller 46 is adjusted by the angle adjusting means 40, and the inclination angle of the upper endless belt 30 located from the fulcrum guide roller 28b to the adjusting roller 46 is set.

The article 14 packaged with the heat-shrinkable film by the packaging machine is transferred to a lower conveyor 16 via a discharge conveyor, and the packaged article 14 is transported toward an entrance 20 a of a heating tunnel 20. This packaged article 14
The upper surface of the upper endless belt 30 facing the upstream inclined portion of the upper belt conveyor 32 is gradually pressed down by the article holding surface, and the packaged article 14 is moved upstream and downstream from the entrance 20 a of the heating tunnel 20 by the upper and lower conveyors 32, 16. It is securely pinched. In this state, the packaging article 14 conveyed inside the heating tunnel 20 has an upper belt conveyor 32 having an upper surface thereof.
, Only the side surface and the bottom surface are heated by the heating air, and the heat shrinkable film at the corresponding portion shrinks and adheres to the article 14.

When the packaged article 14 conveyed in the heating tunnel 20 passes through the position where the fulcrum guide roller 28b is disposed, the upper endless belt 30 of the upper belt conveyor 32 is moved.
Gradually separates from the upper surface of the packaging article 14. At this point, the packaged article 14 faces the inside of the heating tunnel 20, so that the entire article including the heat-shrinkable film facing the upper surface of the packaged article 14 is heated, and the article is shrunk in a state in which shrinkage of the film on the article upper surface is minimized. 14 adheres to the film. That is, since the heat-shrinkable film does not have any unshrinked portions, it is possible to suppress deformation such as distortion of the film printed portion facing the upper surface of the packaged article 14 and generation of wrinkles. In addition, since the upper endless belt 30 of the upper belt conveyor 32 gradually separates from the upper surface of the packaged article 14, the upper and lower conveyors 3
The falling of the packaged article 14 released from the sandwiched state by 2, 16 is prevented. Therefore, unstable packaged articles 14, such as stacked articles and articles having a small bottom area and a high height, can be stably conveyed without falling even during high-speed conveyance.

When changing the shrinkage conditions of the film on the upper surface and the other portions corresponding to different film printing patterns due to a change in the type of the packaged article 14 or the like, the adjusting roller 46 of the angle adjusting means 40 is moved vertically. Move. Thereby, the adjusting roller 46 is moved from the fulcrum guide roller 28b.
The inclination angle of the upper endless belt 30 facing between the two is changed. That is, for example, when the amount of heating of the heat-shrinkable film facing the upper surface of the packaged article 14 is reduced, the inclination angle of the upper endless belt 30 is reduced by moving the adjusting roller 46 downward as shown in FIG. At this time, the period during which the article 14 moves to the outlet 20b of the heating tunnel 20 after the article holding surface of the upper endless belt 30 separates from the upper surface of the packaged article 14 that has reached the article upper surface pinching release area is short, so that the article The amount of contact of the heating air with the heating film on the upper surface can be reduced. When increasing the heating amount of the heat-shrinkable film facing the upper surface of the packaged article 14, as shown in FIG. 5, the adjusting roller 46 is moved upward to increase the inclination angle of the upper endless belt 30. At this time, the article 14 moves to the outlet 20b of the heating tunnel 20 after the article holding surface of the upper endless belt 30 is separated from the upper surface of the packaged article 14 arriving at the article upper surface holding release area. The contact amount of the heated air to the heated film can be increased.

In the embodiment, an article upper surface heating inhibition area for covering the upper surface of the packaged article 14 to prevent heating inside one heating tunnel 20 and an article upper surface pinching release for releasing the upper surface of the packaged article 14 and heating. Since the area is provided, the unshrinked portion of the heat shrinkable film can be shrunk without providing two heating tunnels. Further, only by changing the position of the adjusting roller 46, the shrinkage condition for the heat shrinkable film can be easily adjusted.

[0024]

FIGS. 6 to 8 show modified examples of the angle adjusting means 40 for changing the inclination angle of the upper endless belt 30 facing the article upper surface nipping and releasing area. The angle adjusting means 40 shown in FIG. 6 has the same basic structure as that of the above-described embodiment, and is provided so that a ratchet wheel 62 is integrally rotated with the adjusting handle 54, and The pawl 64 pivotally supported by the support frame 24 is configured to be engageable.
That is, by engaging the pawl 64 with the ratchet wheel 62 at a position where the adjustment handle 54 is rotated in a required direction, the adjustment handle 54, that is, the adjustment roller 46 provided on the swing arm 44 is positioned and fixed.

Another modification of the angle adjusting means 40 shown in FIG. 7 is that the adjusting roller 46 is moved forward and backward (upstream and downstream) in the article conveying direction via a screw shaft 66 and a nut 68 so as to be endless. The angle of the belt 30 is changed. That is, the lower horizontal rod 2 of each support frame 24
A screw shaft 66 is horizontally disposed at 4a, and a nut 68 disposed on a support shaft 70 of the adjusting roller 46 is screwed to the screw shaft 66. If the screw shaft 66 is rotated in the forward and reverse directions by appropriate means, the adjusting roller 46 moves in the front-rear direction in the transport direction along the screw shaft 66, whereby the fulcrum guide roller 28b and the outlet-side guide are moved. The inclination angle of the article holding surface of the upper endless belt 30 located between the roller and the roller 28c can be changed.

Another modification of the angle adjusting means 40 shown in FIG. 8 is that, instead of arranging the adjusting roller 46 between the fulcrum guide roller 28b and the outlet side guide roller 28c so as to be adjustable, By moving the outlet guide roller 28c up and down, the angle of the article holding surface of the upper endless belt 30 facing between the fulcrum guide roller 28b and the outlet guide roller (functioning as an adjusting roller) 28c is changed. It was done. The exit guide roller 28c
Can be employed as a mechanism for vertically moving the shaft as shown in FIG.

The present application is not limited to the configuration of the above-described embodiment, and other configurations can be appropriately adopted. For example, the adjusting roller in the angle adjusting means is shown in FIG.
It is also possible to change the angle of the upper endless belt by adopting a configuration in which the upper endless belt is moved up and down by a mechanism including a screw shaft and a nut as shown in FIG. In addition, as a moving means of the adjusting roller, the fulcrum guide roller, and the exit guide roller, a mechanism including a rack and a pinion, and other various means can be adopted. Further, the lower conveyor does not need to be a belt conveyor, and if a configuration in which heated air can contact the bottom surface of the packaged article, a plurality of bars are installed on a pair of endless chains to convey the packaged article in a mounted state. Various conveyors such as a possible bar conveyor can be appropriately adopted. Furthermore, regarding the width dimension of the upper belt in the upper belt conveyor, when the heat-shrinkable film is not printed on the entire upper surface of the packaged article, or depending on the shape of the packaged article, the dimension covering the entire upper surface of the article. It may be smaller and can be arbitrarily changed.

[0028]

As described above, according to the apparatus for heating and shrinking a film of a packaged article according to the present invention, a region for covering the upper surface of the packaged article inside one heating tunnel to prevent heating, and Since the upper surface is opened and provided with a heatable area, it is possible to reduce the product value by suppressing deformation and wrinkling of the film printing on the upper surface of the article with an extremely simple configuration without increasing the size of the device. Can be prevented. Further, since it is not necessary to provide two heating tunnels, the manufacturing cost can be reduced. Further towards the entrance of the heating tunnel
The packaged goods to be transported are located in the upper and lower
It is securely clamped by the carrier and transported inside the heating tunnel.
Only the side and bottom of the packaged article
Heated and shrinks the heat shrinkable film at the corresponding site
Can be adhered to.

In the upper belt conveyor, the upper belt can be used to prevent the packaged article from falling over in the area for holding and releasing the upper surface of the article.
Since the inclination is made so as to gradually separate from the lower conveyor at the inclination angle, it is possible to effectively prevent a tall and unstable article or the like from tipping over even during high-speed conveyance. In addition, the film on the upper surface and the film on the other portion can be set and changed to arbitrary shrinkage conditions in response to a change in the upper surface printing pattern of an article corresponding to an article of a different type. That is, the shrinking condition of the film on the upper surface of the article can be changed only by changing the inclination angle of the upper belt facing the release area of the upper surface of the article.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a schematic configuration of a device for heating and shrinking a film of a packaged article according to a preferred embodiment of the present invention.

FIG. 2 is a side view of the film heat shrinking apparatus according to the embodiment.

FIG. 3 is a cross-sectional plan view of a main part of the film heat shrinking apparatus according to the example.

FIG. 4 is a schematic configuration diagram showing a state in which the angle of inclination of the upper belt is reduced by the angle adjusting means of the film heating and shrinking device according to the example.

FIG. 5 is a schematic configuration diagram showing a state in which the angle of inclination of the upper belt is increased by the angle adjusting means of the film heating and shrinking device according to the example.

FIG. 6 is a schematic configuration diagram showing a modified example of the angle adjusting means according to the embodiment.

FIG. 7 is a schematic configuration diagram showing another modified example of the angle adjusting unit according to the embodiment.

FIG. 8 is a schematic configuration diagram showing still another modified example of the angle adjusting unit according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 14 Packaged article 16 Lower conveyor 20 Heating tunnel 20a Inlet 20b Outlet 26 Height adjusting means 28b Guide roller 28c for fulcrum Exit side guide roller 30 Upper endless belt 32 Upper belt conveyor 40 Angle adjusting means 46 Adjusting roller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 53-57057 (JP, U) Japanese Utility Model Showa 54-28655 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B65B 53/02

Claims (5)

(57) [Claims] 1. A heating tunnel (20) having an inlet (20a) and an outlet (20b) formed therein, and an article (1) wrapped with a heat-shrinkable film.
4) a lower conveyor (16) for conveying the inside of the heating tunnel (20) from the inlet (20a) to the outlet (20b) with the mounted thereon, and the packaged articles conveyed by the lower conveyor (16). The heat shrinkable film of (14) is shrunk while being conveyed in the heating tunnel (20), and is adhered to the article (14). Lower conveyor (1
An upper belt conveyor (32) is disposed movably above the upper belt conveyor (6), and the upper belt conveyor (32) has an upper belt (30).
The article holding surface facing the article placement surface of the lower conveyor (16) is located upstream of the entrance (20a) of the heating tunnel (20).
Traveling to face parallel to the mounting face of the lower conveyor (16) from location to the outlet side vicinity of the article transport direction downstream side, transport packaging articles (14) and sandwiched between the lower conveyor (16) A possible article upper surface heating inhibition area, and the article sandwiching surface of the upper belt (30) is a packaged article (14) from a required position on the upstream side in the article transport direction from the exit (20b) of the heating tunnel (20) toward the downstream side. of
Run so as to gradually separate from the upper surface of the packaged article (14) placed on the lower conveyor (16) at an inclination angle that can prevent falling.
Film heat shrinking apparatus of the packaging articles, characterized in that the article top gripping release region line are provided. 2. A film for a packaged article according to claim 1, further comprising an angle adjusting means (40) capable of changing an inclination angle of the upper belt (30) in an article upper surface nipping release area of the upper belt conveyor (32). Heat shrink device. 3. An adjusting roller (46) for guiding the upper belt (30) of the upper belt conveyor (32).
The film heating and shrinking device for a packaged article according to claim 2, wherein the inclination angle of the upper belt (30) is changed by displacing the upper and lower parts in the vertical direction or the front and rear direction of the article conveying direction. 4. The angle adjusting means (40) includes an upper belt (3).
0) are guided in a slanting manner so as to be separated from the lower conveyor (16) toward the downstream side in the transport direction.
8c) The adjusting roller (4
3. The film heating and shrinking device for packaged articles according to claim 2, wherein the inclination angle of the upper belt (30) is changed by vertically displacing (6). 5. The upper belt conveyor (32) according to claim 1, wherein a height adjustment means (26) is capable of changing an article holding interval with the lower conveyor (16). Heat shrinking device for film of packaging articles.