JPS649209B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves forming a bag by winding and hanging a packaging film around a cylindrical body for bag making, and filling the bag with a product through the cylindrical body for bag making. The present invention relates to a bag-forming-fill-sealing machine that fuses and bonds the upper part of a bag by closing a sealing device, and more particularly to a deaeration device that discharges air from the bag after filling the bag with a product.

<Prior art> Conventionally, as a deaerator for this type of bag-fill-fill-seal machine, as disclosed in, for example, Japanese Utility Model Publication No. 10274/1983, two air release plates are provided facing a bag filled with a product. There are devices that are provided so that they can be opened and closed, and the air inside the bag is evacuated by pressing the bag from both sides by the closing movement of both air bleed plates.

<Problems to be Solved by the Invention> However, with the deaeration device of such a conventional bag-forming-fill-sealing machine, sufficient deaeration cannot be achieved due to the shape of the product and the filling state of the product. There is a problem in that it is not possible to adjust the level, and the product is easily broken, such as potato chips, because it is pushed by the air release plate and breaks.

Therefore, it is possible to degas the bag by evenly pressing the entire outer periphery of the bag with air pressure, but it takes time to completely deaerate the air inside the bag by sending air so as to surround the entire outer periphery of the bag. Therefore, there is a problem in that high-speed operation of the bag-forming-filling-sealing machine cannot be expected.

SUMMARY OF THE INVENTION In view of the conventional circumstances, an object of the present invention is to reduce the space for introducing air and perform quick degassing work.

<Means for Solving the Problems> The technical means taken by the present invention to solve the above problems is to provide two opposing frames that surround a bag filled with products in a substantially hermetically sealed manner so as to be openable and closable. , an elastic body is stored in each of these frames, a storage recess for storing the bag is formed on the inner surface of one of the elastic bodies, a lattice-shaped air passage is formed on the inner surface of the other elastic body, and both frames are closed. An air supply pipe for feeding air into the storage recess and the air passage is connected in this state, and a recess is formed in the part of the mating surface of both frames that abuts the bag opening.

<Function> According to the above-mentioned technical means, the present invention, after filling the bag with the product, closes both the frames and surrounds the bag in a substantially hermetically sealed manner, thereby firstly sealing the respective elastic bodies. presses the bag to preliminarily degas the inside of the bag, and then introduces air into the narrow storage recess and air passage, which presses the outer circumferential surface of the bag and opens it along the recess. The air inside the bag is exhausted from the gap on the opening side of the bag.

<Example> An example of the present invention will be described below based on the drawings.

1 in the figure is a cylindrical body for bag making, and packaging film A
is wound and formed into a cylindrical shape by the vertical sealing device 20 and suspended. Feeding belts 21, 21 are disposed on both sides of the bag-making cylindrical body 1, respectively, and the feeding belts 21, 21 are brought into contact with the packaging film to intermittently feed the bag _a1 to a predetermined length. do.

A hopper (not shown) is provided above the bag-making cylinder 1 so that the product b can be filled through the cylinder 1, and a sealing device 2 is provided below the cylinder 1 so that it can be opened and closed. establish.

The sealing device 2 is equipped with a separation mechanism in the middle and heaters at the top and bottom, _respectively .
Seal the bottom of a ₂ and separate bag a ₁ from bag a ₂ .

An exhaust pipe 9 having a suction port facing the vicinity of the sealing device 2 is provided inside the bag-making cylinder 1 so as to be interlocked with a degassing device to be described later.

Next, we will discuss the deaerator.

In the figure, reference numerals 3 and 3' denote frames, which are provided at the front and rear of the bag _a1 so as to be openable and closable, and each frame 3 and 3' is provided with a bag storage section 4 and 4', respectively.

A rubber 8 is attached to the periphery of the bag storage part 4 of the frame 3 so that it becomes almost sealed when the frames 3, 3' are closed, and a part of the rubber 8 that comes into contact with the bag _a1 is attached. The recesses 7, 7 are cut out.

The elastic body B to be housed in the bag storage part 4 of the frame 3 is made of sponge or the like and forms a storage recess B ₁ for storing the bag A ₁ , and an air passage B ₂ leading to the storage recess B ₁ is provided so that the air can be It should reach the inlet port 5.

The elastic body B' to be housed in the bag storage part 4' of the frame 3' is also made of sponge or the like, and grid-like air passages _B3 are provided over the entire surface of the bag _A1 .

That is, the elastic bodies B and B' press the bag _a1 to perform preliminary degassing, and the air passages _B2 and _B3 forming the air supply space and the storage recess _B1 become narrow spaces.
Bag _A1 can now be degassed by supplying air for a short time, reducing the time for deaeration work.

An air inlet 5 is provided at the rear of the frame 3, and an air supply pipe 6 is connected thereto.

The air supply pipe 6 is for supplying air into the frames 3, 3', and the other end is connected to the air circuit of the bag making, filling and packaging machine. Air may be constantly blown to the pipe 6, but in this embodiment, the frame 3,
The air is blown in conjunction with the closing movement of 3'.

Regarding the opening and closing mechanism of the frames 3 and 3',
First, guide rods 10 are provided on both sides of the frames 3 and 3', respectively.
The mounting members 11, 11 are slidably fitted to the guide rod 10, and the frames 3, 11 are attached to the mounting members 11, 11, respectively.
3' is provided.

Driving arms 13 are connected to the mounting members 11, 11 through connecting rods, respectively, so that the frames 3, 3' can be opened and closed by a driving cylinder 12'.

To describe the operation of the above embodiment, first, the product b is filled into the bag a1 through the bag-making cylinder ₁ , and then,
When the frames 3, 3' are closed, the elastic bodies B, B' press the bag _a1 to preliminarily degas it, and at the same time air is introduced from the blower pipe 6.

The air passages B ₂ and B ₃ and the storage recess B ₁ are very narrow spaces and are instantly filled with air, and the air pressure of the introduced air causes the bag A ₁ to open as shown in Figures 4 and 5. The air inside the bag a ₁ is discharged through the gap opened along the recesses 7 , 7 on the opening side of the bag a ₁ .

The air discharged from the bag _a1 is discharged to the outside of the cylindrical body 1 through the exhaust pipe 9, and the air introduced into the frames 3 and 3' also passes through the recesses 7 and 7 to the frame 3,
After flowing outside 3', it is discharged through the discharge pipe 9.

The exhaust pipe 9 is connected to a vacuum mechanism to forcibly exhaust air flowing out from the bag _a1 or the frames 3, 3', thereby enhancing the deaeration effect.

Note that the exhaust pipe 9 is not essential in the present invention, and it is optional to naturally discharge the exhaust through the cylindrical body 1.

When the degassing of bag a ₁ is completed, the sealing devices 2, 2 are closed to seal the opening of bag a ₁ and the bottom of bag a ₂ ,
Separate bag _A2 .

Next, open the sealing devices 2, 2 and the frames 3, 3',
After dropping bag _a1 , the feed belt 21 is driven to hang bag _a2 onto bag _a1 , and the above operation is repeated.

In the above embodiment, the degree of degassing of the bag _A1 can be changed arbitrarily by changing the closing movement time of the frames 3, 3' and the amount of air supplied, and the air source for supplying the air can be changed at will. The mechanism is simple because it is derived from the existing air circuit of the filling and packaging machine.

<Effects of the Invention> Since the present invention has the above configuration, it has the following advantages.

After filling the bag with the product, both frames are moved to close and surround the bag in a substantially hermetically sealed manner, so that each elastic body presses the bag and preliminarily degasses the inside of the bag. Then, by feeding air into the storage recess and air passage, which are narrow spaces, the air pressure presses the outer circumferential surface of the bag, and the air inside the bag is discharged from the gap on the opening side of the bag that opens along the recess. Therefore, the space for introducing air can be reduced and the degassing work can be performed quickly.

Therefore, the bag making, filling and packaging machine can operate at high speed.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a deaerator for a bag making, filling and packaging machine showing an embodiment of the present invention, Fig. 2 is a partially cutaway side view showing an enlarged view of the main parts, and Fig. 3 is a partially cutaway side view showing an enlarged view of the main parts. The exploded perspective view of the degassing device, FIGS. 4 and 5, are a vertical front view and a vertical side view showing the degassing state. A...Packaging film, B, B'...Elastic body, B ₁
... Storage recess, B ₃ ... Air passage, a ₁ ... Bag,
b... Product, 1... Cylindrical body for bag making, 2... Sealing device, 3, 3'... Frame, 6... Air supply pipe, 7...
...concavity.

Claims (1)

[Claims] 1 A bag making method in which a packaging film is wound and hung around a cylindrical body for bag making to form a bag, a product is filled into the bag through the cylindrical body for bag making, and the upper part of the bag is melted and bonded by the closing movement of a sealing device. In a filling and packaging machine, two frames that surround the bag filled with the product in a substantially hermetically sealed manner are provided opposite each other and can be opened and closed, and an elastic body is stored in each of these frames, and the inner surface of one of the elastic bodies is A storage recess for storing the bag is formed with a lattice-shaped air passage on the inner surface of the other elastic body, and an air supply pipe for supplying air into the storage recess and the air passage is connected with both frames closed. A deaeration device for a bag making, filling and packaging machine, characterized in that a concave portion is formed in a portion of the mating surface of both frames that comes into contact with the bag opening.