JPH0594110U - Wrapping film shrink tunnel - Google Patents

Abstract

(57) [Abstract] [Purpose] When the packaging film 9 is overlapped with the product 8 and sent to and passed through the shrinking tunnel, the shrinking state of the packaging film 9 can be monitored from the outside of the shrinking tunnel. To do. [Composition] A window 25 is provided on the side wall 5 of the contraction tunnel,
The window 25 is shielded by the transparent plate 26, the upper wall surface 27 of the window 25 is formed at a position higher than the product 8 in the contraction tunnel, and the upper wall surface 27 is inclined upward toward the outside of the window 25.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packaging film shrink tunnel for shrinking a packaging film in a process of packaging a product with the packaging film.

[0002]

[Prior art and its problems]

 When packaging a product with a wrapping film, the wrapping film is usually overwrapped on the product and conveyed by a conveyor. A shrinkable plastic film is used as the packaging film, and the product is often sent to a shrinking tunnel after the packaging films overlap. The shrink tunnel is for shrinking the packaging film. The product is conveyed by the conveyor, passes through the shrink tunnel, and the packaging film is heated in the shrink tunnel, shrinks, and the product is tightly packed. The product is then discharged from the shrink tunnel.

By the way, the conventional contraction tunnel was a dark tunnel closed from the outside. Therefore, when the product is passing through the shrink tunnel, it cannot be seen from outside the shrink tunnel, and the shrink condition of the packaging film cannot be monitored. After the product was discharged, it was only possible to determine the shrinkage state of the packaging film, which was not always sufficient for quality control. Therefore, it is required to monitor the shrinkage state of the packaging film from the outside of the shrinking tunnel while passing through the shrinking tunnel.

[0004]

[The purpose of the device]

 Therefore, the present invention is intended to allow the shrinkage state of the packaging film to be monitored from the outside of the shrinking tunnel when the packaging film is overlapped with the product and is sent to and passed through the shrinking tunnel. It is a thing.

[0005]

[Device configuration]

 According to this invention, a window is provided on the side wall of the contraction tunnel, and the window is shielded by the transparent plate. Furthermore, the upper wall surface of the window is formed higher than the product in the shrink tunnel, and the upper wall surface inclines upward toward the outside of the window.

[0006]

[Explanation of Examples]

 An embodiment of this invention will be described below.

In FIG. 1, the shrink tunnel has an inlet 1 and an outlet 2. Further, as shown in FIG. 2, the contraction tunnel is in the shape of a rectangular tube and has a top wall 3, a bottom wall 4 and a side wall 5. The top wall 3, the bottom wall 4 and the side wall 5 are composed of a metal plate 6 and a heat insulating material 7. Then, the packaging film 9 is overlapped on the product 8 and is fed by the conveyor 10. As shown in FIG. 3, the conveyor 10 is composed of a bar conveyor, and has a large number of bars 11, and both ends of each bar 11 are connected to a pair of chains 12. The chain 12 is provided between the inlet 1 and the outlet 2. It extends and engages with and is supported by a plurality of sprockets 13. Therefore, the chain 12 and the bar 11 are driven and advanced by the sprocket 13, and the product 8 and the packaging film 9 are introduced from the inlet 1, pass through the shrinking tunnel, and are discharged from the outlet 2. The packaging film 9 is made of a shrinkable plastic film. The conveyor 10 is at a position lower than the height of the worker, and the product 8 is also sent at a position lower than the height of the worker.

The contraction tunnel also has a heater 14 and a blower 15. Further, a rectangular tubular partition plate 16 is housed in the shrinking tunnel, the partition plate 16 is made of a metal plate and extends in the feeding direction of the product 8, and the heater 14 and the blower 15 are connected to the partition plate 16 and the top wall 3. It is provided in between. The conveyor 10 is located in the partition plate 16, and the product 8 and the packaging film 9 move in the partition plate 16. Further, the partition plate 16 is provided with a suction port of the blower 15, and the air in the partition plate 16 is sucked into the blower 15, the air is sent to the heater 14, and the air is heated by the heater 14, and the air is heated. The hot air flows between the partition plate 16 and the side wall 5, and flows between the partition plate 16 and the bottom wall 14.

Further, on the top wall of the partition plate 16, a large number of hot air holes 17 are provided at positions corresponding to the heaters 14, and the hot air of the heater 14 passes through the hot air holes 17 and is blown into the partition plate 16. And sprayed on the packaging film 9. Further, on the side wall of the partition plate 16, a large number of hot air holes 18 are provided over the entire length thereof, the adjusting plate 19 is superposed on the partition plate 16, and a large number of through holes 20 are provided in the adjusting plate 19, and Hot air is blown into the partition plate 16 through the hot air holes 18 and the through holes 20, and is blown onto the packaging film 9. Further, hot air holes 21 are provided in the bottom wall of the partition plate 16 over the entire length thereof, and the hot air of the heater 14 passes through the hot air holes 21 and is blown into the partition plate 16 and blown onto the packaging film 9. .. Then, the hot air is sucked into the blower 15 and circulates in the contraction tunnel. Therefore, the packaging film 9 is heated from above, from the side and below, whereby the packaging film 9 shrinks and the product 8 is tightly packaged.

The adjusting plate 19 is for adjusting the flow rate of hot air, and is movably supported. The adjusting plate 19 is provided with a pin 22, which is inserted into a long groove formed in the partition plate 16, and the adjusting plate 19 is supported by the pin 22, and the long groove extends in the feeding direction of the product 8. Therefore, the pin 22 can be slid along the long groove of the partition plate 16 and the adjusting plate 19 can be moved in the feeding direction of the product 8. Further, both ends of the adjusting plate 19 are bent inward, and engaging holes 24 are formed in the bent portions 23, and the operating rod is inserted from the inlet 1 or the outlet 2 of the contraction tunnel to bend the adjusting plate 19. It is possible to move the adjusting plate 19 by engaging the portion 23 or the engaging hole 24 and operating the operating rod. Therefore, the hot air holes 18 of the partition plate 16 can be narrowed by the adjusting plate 19 to adjust the flow rate of hot air. The hot air holes 18 of the partition plate 16 can be completely closed by the adjusting plate 19.

Further, a window 25 is provided on the side wall 5 of the contraction tunnel, and the window 25 is shielded by a transparent plate. In this embodiment, windows 25 are provided on both side walls 5, a double glass plate 26 is used as a transparent plate, and a pair of glass plates 26 are formed on the outer and inner wall surfaces of the side wall 5. Are attached to the side wall 5 and fixed, and the window 25 is shielded by this. The window 25 has a rectangular shape and has an upper wall surface 27 and a lower wall surface 28. The upper wall surface 27 is formed at a position higher than the product 8 in the contraction tunnel, and the upper wall surface 27 rises toward the outside of the window 25. The lower wall surface 28 inclines and inclines downward toward the outside of the window 25. Further, a glass plate 29 is provided on the partition plate 16 at a position slightly lower than the window 25.

An infrared lamp 30 is built in the contraction tunnel. The infrared lamp 30 is for illuminating the product 8. In this embodiment, the infrared lamp 30 is attached to the top wall of the partition plate 16 and the hoods 31 are provided on both sides of the partition plate 16. The infrared lamp 30 and the hood 31 are of a constant length. Extend in the feed direction of product 8.

Therefore, in this shrinking tunnel, the product 8 and the packaging film 9 pass through the shrinking tunnel, and the packaging film 9 is heated in the shrinking tunnel and the product 8 is illuminated by the infrared lamp 30 when shrinking. .. Therefore, the contracted state of the packaging film 9 can be monitored through the window 25 and the glass plates 26 and 29 of the partition plate 16 from the outside of the contracted tunnel.

Further, as described above, the product 9 is sent at a position lower than the height of the worker in the contraction tunnel. Regarding the window 25 of the contraction tunnel, the upper wall surface 27 of the window 25 is inside the contraction tunnel. Since it is located at a higher position than the product 9, the shrinkage state of the packaging film 9 can be easily monitored without bending over. Moreover, the upper wall surface 27 of the window 25 is inclined upward as it goes toward the outside of the window 25, so that when the contracted state of the packaging film 9 is monitored, the operator's view is not obstructed, and At the same time, the opening area of the window 25 can be minimized, and the surrounding area can be surrounded by the heat insulating material 7, so that the heat insulating effect can be maintained. Moreover, since the hoods 31 are provided on both sides of the infrared lamp 30, there is no possibility that the light of the infrared lamp 23 directly enters the eyes of the operator.

In this embodiment, the window 25 is provided on both side walls 5 and the double glass plate 26 is used as the transparent plate. However, in some cases, the window 25 is provided on one side wall 5. It may be provided only. A triple glass plate may be used instead of the double glass plate 26 to enhance its heat insulating effect. Multiple or more than three glass plates may be used.

[0016]

[Effect of the device]

 As described above, according to the present invention, when the product 8 and the packaging film 9 pass through the shrinking tunnel and the packaging film 9 is heated and shrinks in the shrinking tunnel, the packaging film 9 comes from outside the shrinking tunnel. It is possible to monitor the contraction state of. Further, the contracted state of the packaging film 9 can be easily monitored without bending over. Moreover, it does not obstruct the view of the operator, the opening area of the window 25 can be minimized, and the surrounding area can be surrounded by the heat insulating material 7, so that the heat insulating effect can be maintained and the intended purpose is achieved. Is what you can do.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

2 is a cross-sectional view of the shrink tunnel of FIG.

3 is a vertical cross-sectional view of the contraction tunnel of FIG.

[Explanation of symbols]

 5 Side wall 8 Product 9 Packaging film 25 Window 26 Glass plate 27 Upper wall surface

Claims (3)

[Scope of utility model registration request] 1. A shrinking tunnel for allowing a product having a packaging film to pass therethrough to heat and shrink the packaging film, wherein a side wall has a window and the transparent plate shields the window. A packaging film shrinking tunnel, wherein an upper wall surface of the window is formed at a position higher than a product in the shrinking tunnel, and the upper wall surface of the window is inclined upward toward the outside of the window. 2. The shrink tunnel according to claim 1, wherein a multiple glass plate is used as the transparent plate. 3. The shrink tunnel according to claim 1, further comprising an infrared lamp for illuminating the product.