JPH0744573Y2 - Film fusing and welding equipment for packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a film fusing and welding device for packaging used in an L-sealer packaging device for packaging products with a heat-shrinkable film.

[Prior Art] An L-sealer packaging device is one in which a product is put between two long heat-shrinkable films that are folded in two, and the opening of this film is sealed and melted by an L-shaped sealing device. is there.

In the conventional film fusing and welding apparatus for packaging, a fusing blade for fusing the film is sandwiched by a heat bar, a heater is attached to the center of the heat bar, and the fusing blade heated allows fusing and fusing of the film. Also,
On both sides of the heat bar, in order to prevent the film from rising during fusing and welding, a film retainer protruding in the tip direction from the fusing blade is provided so that it can move up and down. Fused and welded.

[Problems to be Solved by the Invention] In the case of the above-mentioned conventional technique, the film presser extends straight downward along the heat bar, and the interval between the film pressers is relatively wide, so that the film sags between the film pressers, It may get excited. In this case, the film is
There are problems that a fusing blade may be used to make a hole or that welding may not be sufficient and defective packaging may result.

This invention was made in view of the above-mentioned conventional technology,
Even when the film melts, the film does not rise,
It is an object of the present invention to provide a packaging film fusing and fusing device capable of always fusing and fusing accurately and cleanly.

[Means for Solving the Problems] In this invention, a fusing blade is provided between heating devices of an L sealer attached to a sealing device, and a film retainer having tips protruding from the fusing blade on both sides of the fusing blade can be retracted. A film fusion welding apparatus for packaging, in which the tip of the film retainer is bent and disposed near the fusion cutting blade while being attached, and a cooling pipe is provided along the film retainer.

[Operation] The film fusing / welding device for packaging of the present invention, when fusing the film with the fusing blade, the film retainer is in the vicinity of the fusing blade and there is no slack or swelling of the film. It does not have heat because it exists.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1 and FIG. 2, the packaging film fusing and welding apparatus of the present embodiment comprises a sealing device 1, a product conveying belt 2,
It is composed of a film feed 3 and a film opening device 4. The film 5 used in this sealing device 1 is the second
As shown in the figure, the heat-shrinkable film 5 is folded in two and wound into a roll, and the film roll 6 is attached to the film feed 3. The film opening device 4 includes guide plates 7 and 8 having an isosceles right triangle shape and a pair of support columns 9 holding the guide plates 7, 8.
The product transport belt 2 is inserted between the guide plates 7 and 8. The guide plates 7 and 8 are provided in parallel with each other and the product conveyor belt 2, and are arranged on the hypotenuse of the isosceles right triangle so as to be 45 degrees with respect to the traveling direction of the product conveyor belt 2. In the film 5, the guide plates 7 and 8 are inserted between the two folded films to widen the film interval, and the front and back surfaces of the film 5 are inverted at the oblique sides thereof. You can change the direction by 90 degrees in the direction of the movement across.

In the sealing device 1, an L-shaped L sealer 10 is attached to a base frame 11, and a seal cradle 12 is provided at a lower position facing the L sealer 10.
Is provided, and the base frame 11 is a base 13 on which the device is attached.
On the other hand, it is provided so as to be swingable about the rotary shaft 14. Further, the base frame 11 is connected to one end of a link mechanism 15, and the link mechanism 15 is connected to an air cylinder 16.

In the L sealer 10, a pipe heater 21 is sandwiched between a pair of heat bars 20 made of an aluminum alloy or the like as a heating device, and a fusing blade 22 is sandwiched below the pipe heater 21 so as to project downward from the lower end surface of the heat bar 20. There is. The pair of heat bars 20 are connected to each other by screws 28, and the fusing blade 22 is also fixed. An upper plate 25 is attached to the upper end surface of the heat bar 20 via a heat insulating material 24, and a connecting piece 26 is fixed to a predetermined portion of the upper plate 25 so that the upper frame 25 can be connected to the base frame 11. Here, the pipe heater 21 is provided with a nichrome wire 30 provided at the center and glass fibers 31 filled around the nichrome wire 30.

The fusing blade 22 is formed of a metal such as an aluminum alloy having a high thermal conductivity, and its surface is coated with Teflon.

A pair of film pressers 35 are attached to both sides of the L sealer 10, and the film pressers 35 are usually the fusing blades 22.
Further, it is located so as to project further toward the tip thereof. A holding piece 36 is formed so as to project from the upper edge of the film retainer 35, and the connecting member is located on the upper surface side of the base frame 11.
A pair of holding pieces 36 are connected by 37 with the base frame 11 interposed therebetween. The connecting member 37 is biased toward the upper surface of the base frame 11 by the coil spring 38, and is movable in the direction in which the coil spring 38 compresses. Therefore, the film retainer 35 is positioned downward by the coil spring 38, that is, further protruded from the tip of the fusing blade 22 in the tip direction and biased, and is mounted so as to be retractable in the opposite direction. A support shaft 39 is passed through the coil spring 38 and held by a support frame 40.

Further, the leading ends of the film retainers 35 are bent toward the fusing blades 22 in a direction in which they are close to each other, and the intervals between the film retainers 35 are narrowed. A metal cooling pipe 48 is welded to the bent portion. The cooling pipe 48 is connected to an air pump via a hose 49 so that the air passes through the cooling pipe 48 on the side surface of each film retainer 35. This cooling pipe 48
For example, air may be flowed so as to go around each film presser 35, or each film presser 35 may be connected to an air pump. Alternatively, a small hole may be formed in the side surface of the cooling pipe 48 so that air can be blown to the film retainer 35.

A product delivery belt 41 is provided below the sealing device 1, and a heat tunnel (not shown) is provided at the tip of the product delivery belt 41. Then, the seal receiving base 12 is installed so as to surround the product conveying belt 41, and the seal receiving base 12 is provided with the heat-resistant silicon rubber receiving portion 46 on the surface of the base 45, and the film of the fusing blade 22. Adhesion to 5 is secured. Further, the seal pedestal 12 is supported by the support frame 52 via a buffer spring 51.

In the film fusing and welding apparatus for packaging having the above configuration, when the product 50 is placed on the product transport belt 2 and the device is activated, the product 50 enters between the two-folded films 5 and comes under the sealing device 1 as illustrated. If the sensor does not operate, the sealing device 1 automatically operates to seal the opening of the film 5. Here, since the opening of the tip of the film 5 is sealed by the first sealing operation as shown in FIG. 1, after this,
Since one side surface and the rear surface are opened, the L sealer 10 simultaneously seals the openings in these two directions.

As shown in the drawing, the seal causes the L sealer 10 to descend toward the film 5 by the link mechanism 15 when the air cylinder 16 operates. At this time, the film retainer 35 first hits the film 5, and the film retainer 35 receives the biasing force of the coil spring 38 while pressing the film 5 against the seal holder 12.
Will stop. However, the base frame 11 moves toward the film 5 while further compressing the coil spring 38, and the fusing blade 22 moves toward the film 5.
Is pressed and pressed so as to bite into the receiving portion 46. After this, the air cylinder 16 operates in reverse, the L sealer 10 is retracted, and the sealing is completed.

Here, the seal portion of the film 5 is in a state of being fused and welded by the fusing blade 22. The temperature of the fusing blade 22 may be appropriately set depending on the material of the film 5, and is usually set between 120 ° C and 250 ° C.

According to the packaging film fusing / welding device of this embodiment, the tip portions of the film pressing members 35 approach each other toward the fusing blade 22,
There is no slack or swelling of the film 5 when it is pressed. Moreover, although the film retainer 35 is close to the heat bar 20, heating of the film retainer 35 is prevented by the air passing through the cooling pipe 48, so that the film retainer 35 does not shrink the film 5 or make a hole.

The shape of the film presser of the present invention may be other than that of the embodiment, and may be appropriately set depending on the material and thickness of the film.

Further, the medium flowing through the cooling pipe may be water other than air or other refrigerant.

[Advantages of the Invention] In the film fusion welding apparatus of the present invention, since the film retainer is brought closer to the fusion blade, sagging of the film at the time of fusion is eliminated, and shrinkable packaging without welding mistakes can be performed.

Moreover, since the film retainer is cooled by the cooling pipe, it is not heated by the heat of the fusing blade and the film is not damaged.

[Brief description of drawings]

FIG. 1 is a side view of a sealing device of an embodiment of the present invention, FIG. 2 is a perspective view of a packaging film fusing and welding device of this embodiment, and FIGS. 3 and 4 are of a sealing device of this embodiment. It is a partial fracture longitudinal section showing a use state. 1 ... Sealing device, 5 ... Film, 20 ... Heat bar, 21 ... Pipe heater, 22 ... Fusing blade, 35 ... Film retainer, 48 ... Cooling pipe

Claims (1)

[Scope of utility model registration request] 1. A product is placed between two folded heat-shrinkable films, a fusing blade is provided between heating members, and the fusing blade is heated by an L sealer arranged in an L shape. With a fusing blade, in a film fusing and welding device for packaging that fusing and sealing the opening of a film, a pair of film retainers are attached to both sides of the fusing blade so as to be movable in the proximal direction, and the tip of this film retainer is Fusing welding for packaging film characterized by being bent in directions close to each other toward the fusing blade and having its tip projecting from the tip of the fusing blade, and mounting a cooling pipe along the film retainer. apparatus.