JP2574654Y2 - Heat shrink wrapping machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shrink wrapping machine used for packaging an article using a heat shrink film.

[0002]

2. Description of the Related Art A general heat shrink wrapping machine is provided with a conveyor belt 3 below a heating tunnel 2 covered with a cover 1 as schematically shown in FIG. While the heat-shrinkable film 5 is placed on the conveyor belt 3 and passes through the heating tunnel 2, the heat-shrinkable film 4 is heated and shrunk by hot air to package the article to be packaged 5.

The hot air is blown into the tunnel from a heating chamber 7 provided between the cover 1 and an inner wall 6 forming a heating tunnel. This hot air is produced by supplying outside air to a heater 8 arranged above the heating chamber 7 by a fan 9, and usually from a plurality of upper and lower two-stage outlets 10 arranged side by side on the walls 6 on both sides of the tunnel. Is blowing out into the tunnel. In order to adjust the blowout amount, a horizontally long adjustment plate 12 having a plurality of blowout holes 11 having the same diameter as the blowout port 10 is slidably provided on the inner wall surface, and the adjustment plate 12 is slid horizontally. The overlap between the outlet 10 and the outlet 11 is controlled.

[0004]

Such a conventional structure is preferable in that the amount of air blowout can be adjusted. However, since the height position of the air outlet is always constant, the object to be packaged passing through the tunnel is preferably used. In some cases, there is an inconvenience that hot air cannot be efficiently blown to the heat-shrinkable film around the article.

[0005] The present invention has been conceived to solve such a conventional problem, and its object is to use the shape of both the outlet and the outlet and the relative change of the mutual overlapping position. Another object of the present invention is to provide a new heat shrink wrapping machine capable of changing the height position of the outlet.

[0006]

SUMMARY OF THE INVENTION The feature of this invention for the above purpose is that a plurality of heat shrink films around the articles on the conveyor belt are heated and shrunk on both sides of the wall of the heating tunnel provided with the conveyor belt below. Hot air outlets are arranged side by side,
In a heat shrink wrapping machine in which a horizontally long adjustment plate provided with the same number of blowout holes overlapping with the blowout opening is slidably provided on a wall portion, the blowout hole on the wall side and the blowout hole on the adjustment plate side have the same shape. In addition to forming a long hole, both are formed to be inclined at the same angle in opposite directions so that both of them overlap each other.

[0007]

[Operation] In the above configuration, since both the outlet and the outlet are oblong and inclined at the same angle in the opposite direction, the overlapping position is moved by the movement of the outlet due to the sliding of the adjusting plate. It moves upward or downward, whereby the height position of the outlet opening at the overlapping position is displaced up and down.

If the moving dimension of the adjusting plate is significantly increased, the blowout hole comes off from the inclined position of the outlet, and the outlet is closed by the plate surface of the adjusting plate.

[0009]

FIGS. 1 and 2 show an embodiment of the present invention, except for the two parts of the heating tunnel, which are the same as the conventional machine shown in FIG. It is abbreviated.

The upper and lower sides are inserted into three upper and lower two outlets 20 provided on both sides of the wall portion 6 of the heating tunnel 2 with a required space therebetween, and a horizontal guide member 23, respectively.
In the horizontally long adjustment plate 22 slidably provided on the inner surface of the nozzle, three air outlets 2 provided at the same interval as the air outlet 20 are provided.
1 are both formed by long holes having the same shape.

Further, both of them are formed to be inclined at the same angle in opposite directions so as to cross each other.
The height position of 0 is displaced up and down.

As shown in the lower part of FIG. 1, the opening position of the air outlet 20 is based on a position where both of them cross at the center, and if the moving dimension of the adjustment plate 22 is significantly larger than that position, As shown in the upper part, the blowout hole 21 is removed from the inclined position of the blowout port 20, and the blowout port 20 is closed by the plate surface of the adjustment plate 22.

However, the adjusting plate 22 in a range where both do not come off.
In the movement of, as shown in FIG.
A difference in elevation occurs at the opening position of the outlet 20. Therefore, when the object to be packaged is tall and hot air needs to be blown from a position higher than the reference position, the adjustment plate 22 is moved to the right with respect to the figure as shown in the upper part of FIG. Only by this, the position of the outlet 20 can be displaced higher.

On the other hand, when the packaged article is short and needs to blow hot air from a position lower than the reference position, as shown in the lower part of FIG. , The position of the outlet 20 can be displaced low.

[0015]

According to the present invention, as described above, the outlet on the wall side and the outlet on the adjustment plate have the same shape as the elongated hole.
Since the two are inclined and formed at the same angle in the opposite direction so that they cross each other, it is possible to change the height position of the outlet opening at the overlapping position with the outlet by sliding the adjustment plate up and down. This makes it possible to adjust the height of hot air to be blown out according to the height of the packaged article, so that the heating efficiency is higher and heat energy for heat shrink wrapping can be used more effectively than before.

Further, since only the shape and the angle of both the side outlet and the outlet of the adjusting plate are changed, there is no change in the other configuration from the conventional one, so that it can be immediately applied to the conventional heat shrink wrapping machine. Features such as

[Brief description of the drawings]

FIG. 1 is a main part surface view of a heating tunnel wall of a heat shrink wrapping machine according to the present invention.

FIG. 2 is an explanatory diagram showing a change in a height position of an air outlet due to movement of an adjustment plate.

FIG. 3 is a schematic longitudinal sectional front view of a general heat shrink wrapping machine.

FIG. 4 is a surface view of a heating tunnel wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 2 Heating tunnel 3 Belt conveyor 4 Heat shrinkable film 5 Packaging article 6 Wall of heating tunnel 20 Slot outlet 21 Slot outlet 22 Adjusting plate 23 Guide member

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of hot air outlets for heating and shrinking a heat-shrinkable film around an article on a conveyor belt are provided side by side on both sides of a wall of a heating tunnel provided with a conveyor belt at a lower side. In a heat shrink wrapping machine in which a horizontally long adjustment plate provided with the same number of blowout holes slidably provided on a wall portion, the blowout hole on the wall portion and the blowout hole on the adjustment plate side have the same long hole shape. A heat-shrinkable packaging machine characterized in that both are inclined and formed at the same angle in opposite directions so that both of them cross-polymerize.