JPH0331573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a packaging bag manufacturing method and a packaging bag manufacturing apparatus.

(Prior Art) Conventionally, mushrooms such as enoki mushrooms are stored in predetermined amounts in bags and provided to the market. There are various types of packaging bags for storing mushrooms, and among them, as shown in FIG. 3, there is a packaging bag in which the packaging film is folded in the center and one edge is open. This packaging bag has a long shape as shown in the figure, and is provided in a rolled form.

When packaging mushrooms using this packaging bag,
Mushrooms are dropped into the opening side of a packaging bag pulled out from the roll, and the sides and top and bottom are sealed and packaged.

Conventionally, when manufacturing packaging bags folded in the center, a film with approximately the same width as the width of the packaging bag was prepared, and this film was sent out in one direction, folded in two, and then rolled up one after another. There is. In this way, a packaging bag is formed in which the film is sequentially folded in the center.

(Problems to be Solved by the Invention) As mentioned above, conventionally, a long film is folded into equal parts in the width direction to make a packaging bag, but this packaging bag has two parts, the upper and lower sides of the folded and opened side.
It is required that the edges of the sheets overlap properly. This is a fairly strict requirement in order to ensure that the packaging bag is neatly sealed and to prevent mechanical troubles when the packaging bag is set in an automatic packaging device and used. Therefore, in order to match the edges of the opening of the packaging bag, conventionally, after the film is folded, the edge of the opening is slightly cut to make the packaging bag a predetermined size and the edges of the opening are made to match. Ta. Therefore, there is a problem in that the manufacturing efficiency of the packaging bag is not sufficient and the film material is wasted.

Therefore, the present invention has been made in view of the conventional packaging bag manufacturing method, and its purpose is to further improve manufacturing efficiency, eliminate waste of packaging bag materials, and ensure reliable manufacturing. The purpose of the present invention is to provide a method for manufacturing a packaging bag and an apparatus therefor.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, in a method for manufacturing a packaging bag formed by folding a long film on the center line in the width direction and opening one end side, the side edges of the long film are faced toward the center in the width direction. A long packaging bag is created by folding the film, folding it so that the edges on both sides overlap slightly when folded, and cutting the folded film through the center in the width direction and through the overlapped part. A packaging bag manufacturing apparatus comprising a long film folded along the center line in the width direction and opened at one end, further comprising: a film feeding mechanism for transporting a film of a predetermined width; There is a folding section where the side edges of the film are folded so that they face each other toward the center in the width direction, and the edges of both sides are slightly overlapped when folded. The film is characterized by comprising a cutter that cuts the film through the center and through the folded overlapping portion, and a winding section for each of the two films separated by the cutter.

(effect) Next, the effect will be explained.

The film transferred to the folding section by the film feeding mechanism is folded in such a manner that both side edges are slightly overlapped when passing through the folding section. Then, by cutting the folded film through the center, it is possible to obtain a packaging bag that is folded on the center line in the width direction of the long film and is open at one end.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing the overall configuration of a packaging bag manufacturing apparatus according to the present invention.

In the figure, reference numeral 10 denotes a film bobbin around which a film of packaging bag material is wound, and a brake 12 is provided on the rotating shaft of the film bobbin 10 to prevent the film bobbin 10 from over-rotating. 14 and 16 are rollers disposed on the feeding side of the film bobbin 10. The roller 16 is a roller that detects the tension applied to the film. The film transferred from the film bobbin 10 is controlled so as not to meander, and is therefore adjusted to be drawn out with a constant tension.

Reference numeral 18 denotes a meandering correction device for correcting the meandering of the film, and rollers 18b and 18c for guiding the film are provided respectively on the front and rear ends of a correction table 18a that swings left and right with respect to the film transport direction. This meandering correction device 18 is provided with sensors for detecting the positions of both side edges of the film to be transferred, and based on the detection results, when the film is displaced from its normal position, the correction table 18a is driven and the correction table 18a is always adjusted. The normal position is adjusted so that the film is transferred. Since the film is subsequently folded in place, proper transport of the film is an extremely important condition for proper folding.

Reference numeral 20 denotes a folding portion for sequentially folding both side edges of the film facing each other, and is a portion for folding the film so that both side edges of the film are located at the center in the width direction and overlap somewhat when folded. In this embodiment, the folding section 20 is provided with a sliding plate 22 that slides and guides the transferred film.
They are arranged almost horizontally on both sides of the sliding plate 22, and their tips in the film feeding direction are arranged slightly narrowly inward to guide the film so that the side edges of the film are bent inward. a pinching rod 24; and a film edge holding roller 2 disposed on the exit side of the sliding plate 22, which presses the upper surface of the side edge of the folded film and folds the film into a specified width.
6. The film exit side of the sliding plate 22 is provided horizontally, and the sliding plate 2
The film entrance side of No. 2 is raised with a smooth curved surface so that the film can be easily received by the sliding plate 22. Since the width when the film is folded is regulated by the width of the sliding plate 22, the width of the sliding plate 22 is set in advance in accordance with a predetermined folding width. 28 is a support frame for fixing the sliding plate 22.

After passing through the folding section 20, the film is transported in a predetermined folded state.
is on the transport path of the folded film, and the folded film is placed at the center in the width direction.
This is a cutter for cutting the folded side edges of the film vertically. After being cut by the cutter 30, the film is separated into two parts, each of which has a bobbin 32a, 32b.
It is wound up.

In this embodiment, rollers 34a, 34b and 32a, 32b provided at the rear of the cutter 30 are rotated to transport the film.

Next, a method for folding the film in the above-mentioned packaging bag manufacturing apparatus will be explained.

FIG. 2a is an explanatory diagram showing the film after passing through the folding section 20. FIG. As shown in the figure, the film is folded so that the side edges of the film overlap somewhat at the center in the width direction. The folded film is cut on the center line A in the width direction by the cutter 30 and divided into two parts.
When folding the film, it is necessary to place the overlapped side edges of the film on the center line A. That is, it is necessary to fold the film so that the vertically overlapping portions of the side edges of the film are both cut by the cutter 30. FIG. 2b shows that by cutting with the cutter 30 after cutting, two packaging bags folded in the center can be obtained at a time.

Therefore, the width of the film material used in this manufacturing apparatus is wider than the width of the finished packaging bag by the amount of overlap of the film edges. Also, when cutting with cutter 30,
As shown in the figure, there is an extra lip 36 at the film edge that is folded upward.
a and the lip 36b, which is the film edge part folded downward, comes out, so the bobbin 32
When winding onto the lips 36a and 32b,
b is removed and wound up. Lips 36a, 36b
For example, they can be removed by blowing them away with a blower.

As mentioned above, in this packaging bag manufacturing device, the overlapping parts of the folded films are cut, so the openings of the finished packaging bags match perfectly, and the packaging bags wound on the bobbins 32a and 32b are completely cut. It becomes a packaging bag.

In addition, the lip 36 produced by cutting with the cutter 30
Since a and 36b only have a lip on one side of one packaging bag, film materials can be saved.

The above-mentioned film can be used as a packaging bag by printing product names, figures, etc. on its surface at predetermined intervals and then setting it in an automatic packaging device.

(Effects of the Invention) According to the present invention, as described above, the side edges of the long film are folded so as to overlap,
Since the overlapping portions are cut, it is possible to easily obtain a long packaging bag whose opening edges perfectly match, and to manufacture the bag very efficiently. In addition, since only a small amount of excess lip portion comes out during cutting, there is a significant effect that the packaging bag material is not wasted.

The present invention has been variously explained above with reference to preferred embodiments, but the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. That's true.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing the configuration of a packaging bag manufacturing apparatus according to the present invention, FIG. 2 is an explanatory view showing a film folding method, and FIG. 3 is a perspective view showing an example of a conventional packaging bag. DESCRIPTION OF SYMBOLS 10...Film bobbin, 18...Meandering correction device, 20...Folding part, 22...Sliding plate, 24
...Pinch bar, 26...Film edge holding roller, 30...Cut, 32a, 32b...Bobbin, 36a, 36b...Rip.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a packaging bag formed by folding a long film along the center line in the width direction and opening one end, wherein the side edges of the long film are directed toward the center in the width direction. Fold the film so that they are facing each other, so that the edges on both sides overlap slightly when folded, and then cut the folded film through the center in the width direction and through the overlapped part. A method for manufacturing a packaging bag, characterized by manufacturing a square packaging bag. 2. In an apparatus for manufacturing a packaging bag formed by folding a long film along the center line in the width direction and opening one end, there is a film feeding mechanism for transporting a film of a predetermined width, and a film feeding mechanism that transports a film of a predetermined width, and a side edge of the film that is folded along the center line in the width direction. A folding part is folded in such a way that the edges of both sides overlap slightly when folded, and the film folded by the folding part is passed through the center in the width direction and the folded part is 1. A packaging bag manufacturing apparatus comprising: a cutter that cuts the film through the overlapping portion; and a winding section that winds up each film separated into two by the cutter.