JP2583749B2 - Manufacturing method of plastic packaging bag and plastic packaging bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plastic packaging bag suitable for packaging vegetables such as mushrooms and a plastic packaging bag suitable for packaging mushrooms and the like.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example (Japanese Patent Publication No. 63-7939) of a manufacturing method for continuously manufacturing plastic bags used for packaging vegetables such as mushrooms. In this manufacturing method, a long tubular film 5 is used, and each time the tubular film 5 is intermittently conveyed by the width of the packaging bag, heat is traversed across the tubular film 5 in the width direction by the heat sealing portion 6. The package bag 9 is welded, cut in the longitudinal direction at the center position in the width direction of the tubular film 5 with the cutter 7, and the tubular film 5 is cut off by the hot cutting blade 8 in accordance with the position where the heat welding is performed. obtain.

[0003] In the illustrated example, the heat seal portion 6 is heat-sealed in the form of two lines slightly spaced apart from each other, and the middle of the two heat seal portions is thermally fused by a heat fusing blade 8. In this way, the packaging bag 9 having the side opened by the cutter 7 is obtained. FIG. 6 shows a packaging bag 9 obtained by the above method, in which 10 is an opening, 11 is a heat sealing portion, 12 is a heat fusing portion, and 13 is a bottom portion.

[0004]

By the way, in the packaging bag 9 formed by using the tubular film as described above, since the tubular film 5 is wound into a roll and used, the folded portion exposed at the end of the roll is transported. By rubbing, a product having a flaw in the bottom portion 13 of the packaging bag 9 corresponding to the folded portion or a portion where the bottom portion 13 and the heat seal portion 11 intersect (A portion in FIG. 6) are weakened, and a pinhole is formed. There was a problem that For this reason,
Intersection of bottom part 13 and heat seal part 11 (part B in FIG. 6)
Is reinforced by thermocompression bonding.

The present invention has been made to solve the problem that the sealing property of the packaging bag is impaired when the packaging bag is manufactured using the tubular film. Another object of the present invention is to provide a method for producing a good-looking plastic packaging bag and a plastic packaging bag.

[0006]

The present invention has the following arrangement to achieve the above object. That is, a method of manufacturing a plastic packaging bag in which a plastic packaging bag is continuously manufactured using a long body of a tubular film formed with a width dimension corresponding to two widths of the packaging bag. While being intermittently transported according to the size of the packaging bag to be sealed, the sealing portion is heat-sealed with a heat sealing body in a rectangular frame shape on the tubular film according to the size of the sealing range of the packaging bag. On the destination side of the heat seal portion, cut in the longitudinal direction at the center in the width direction of the tubular film, and adjacent to the seal portion provided at a constant interval on the front side from the cut position. By thermally fusing the intermediate position, a plastic packaging bag in which three sides other than the opening side are heat-sealed is obtained. Further, in a method for manufacturing a plastic packaging bag in which a plastic packaging bag is continuously manufactured by using a long body of a folded film formed with a width dimension of one packaging bag, the packaging bag to be manufactured with the folded film is manufactured. While intermittently transporting according to the size, the sealing portion is provided by heat-sealing the three sides of the folded film except for the overlapping end in accordance with the size of the sealing range of the packaging bag, and the destination of the heat sealing portion is provided. On the side, a plastic packaging bag in which three sides other than the opening side are heat-sealed is obtained by thermally fusing an intermediate position adjacent to the seal portion provided at regular intervals. Further, in the plastic packaging bag, a housing portion is provided in which a side excluding the opening side is sealed in a U-shape by a series of seal portions formed by a linear heat seal, and a side facing the opening side is provided. A printing portion is formed between the folded portion of the plastic film and between the folded portion and the seal portion, and opposite side edges except the opening side and the folded portion are thermally blown. I do.

[0007]

The method of manufacturing a plastic packaging bag according to the present invention is characterized in that, when a sealing portion is provided on a tubular film or a folded film, all three sides except the opening side of the packaging bag are heat-sealed. And As a result, regardless of whether the tubular film or the folded film is used, regardless of the folded portion of the film regardless of the storage portion of the product in the packaging bag, it is possible to avoid the problem that a pinhole is generated at the folded portion of the film and avoid the problem of the packaging bag. It is possible to improve the sealing performance. In addition, the packaging bag according to the present invention has good sealing performance and can be provided as a good-looking bag when the product is sealed and displayed.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are explanatory views showing an embodiment of the method for manufacturing a plastic packaging bag according to the present invention. As shown in FIG. 1, the method of this embodiment is a method using a plastic tube-like film 5 wound into a roll, and a plastic material such as polyethylene is used as the plastic film. The tubular film 5 has a double size width in which two packaging bags can be obtained in the width direction.

In the embodiment, the tubular film 5 is first heat-sealed in the width direction by the heat sealing body 20 while the tubular film 5 is intermittently pulled out from the roll by a predetermined length. The heat seal body 20 is for hermetically sealing three sides other than the open side of the packaging bag. For this reason, the seal portion 22 to be sealed by the heat seal body 20 is set to have a planar shape and a rectangular frame shape as shown in FIG. Since the inner area formed in the shape of a rectangular frame is the storage area of the packaging bag, the heat seal body 20 should have a predetermined size for each product according to the size of the packaging bag and the sealed area.

The width and the like of the seal portion 22 formed by the heat seal by the heat seal body 20 are appropriately set according to the material and the product. In the embodiment, the seal portion 22 is provided in a linear shape having a width of about 1 mm. Since a high degree of airtightness is required for a packaging bag for storing mushrooms and the like, the sealing portion 22 must be capable of reliably and hermetically sealing the overlapping upper and lower tubular films 5.

The heat sealing by the heat sealing body 20 is performed while the tubular film 5 is intermittently conveyed. Heat seal 2
0 is the size corresponding to the product and the sealing portion 22 according to the width.
Is provided, the tubular film 5 is conveyed at a feed pitch slightly larger than the width of the seal portion 22 and heat-sealed. Thus, as shown in FIG.
Of the sealing portion 22 on the tubular film 5 with the transfer of
Are formed in a certain size at a certain interval.

In the embodiment, as shown in FIG.
A space is provided between the end portion of the tubular film 5 and the folded portion 5a of the tubular film 5 because the space is used as the printing portion 24 such as a product name stored in the packaging bag. The printing unit 24 is a tubular film 5 as shown in the figure.
Can be continuously provided along the folded portions 5a on both sides of the.

After the sealing portion 22 is formed on the tubular film 5, on the destination side of the tubular film 5,
The central position in the width direction of the tubular film 5 is cut in the longitudinal direction by the cutter 7. As a result, the tubular film 5 and the sealing portion 22 that are continuous in the width direction are divided into two. The side cut by the cutter 7 becomes the opening side of the packaging bag.

Next, the tubular film 5 is blown in the width direction using the hot fusing blade 8. As a result, a single packaging bag is obtained. The heat fusing blade 8 has a seal portion 22 formed in a frame shape.
In this case, the intermediate position of the adjacent seal portion 22 is thermally blown, and the tubular film 5 is sequentially thermally blown while being intermittently conveyed. As a result, the single packaging bag 30
Is obtained.

FIG. 3 shows a perspective view of the packaging bag 30 obtained. In the figure, 5a is a folded portion, 30a is an opening side, and 8a is a thermal fusing portion. The thermal fusing portion 8a blows the film and welds the side edges thereof in a linear manner to define the outer dimensions of the packaging bag 30. The heat seal portion 22 is formed of a material other than the opening side 30a.
At the side, the printing unit 24 is sealed with a slight gap from the thermal fusing unit 8a and a printing unit 24 from the turnback unit 5a.

A comparison between the packaging bag 30 shown in FIG. 3 and the conventional packaging bag 9 shown in FIG. 6 shows that in the conventional packaging bag 9, the folded portion of the tubular film has the bottom portion 1 in a state in which the goods are stored.
3, whereas the packaging bag of the embodiment has an opening side 30a.
Is the bottom. In both the case of the conventional packaging bag 9 and the case of the packaging bag 30 of the embodiment, the product is in the opening 1
It is stored in the bag from 0 or the opening side 30a, and the inside of the bag is evacuated and sealed by heat sealing if necessary, but the packaging bag 30 of the embodiment is heat-sealed on all four sides with the product sealed. It is characteristic that it becomes a state.

That is, in the conventional packaging bag 9 shown in FIG. 6, the bottom portion 13 of the packaging bag 9 becomes a folded portion of the tubular film 5 in a state in which goods are stored and sealed, whereas the packaging bag of this embodiment is In the case of the bag 30, the folded portion 5 a of the tubular film 5 does not appear in the storage portion that seals the product, but only appears as the edge of the printing portion 24. Therefore, in the case of the packaging bag 30 of the present embodiment, even if the folded portion 5a of the tubular film 5 is rubbed during handling such as conveyance or a pinhole is opened, the sealing property of the product is not affected at all. Can be stored.

Since the method of heat-sealing the tubular film 5 by the heat-sealing body 20 is an extremely reliable method for airtight sealing, it is impossible to completely seal the four sides of the packaging bag by heat-sealing as in this embodiment. It can be suitably used as a packaging bag for commodities requiring airtightness such as mushrooms.
Since the area enclosed by the seal portion 22 is the storage portion for storing the product, the size of the seal portion 22 is set according to the capacity of the product.

In the packaging bag 30 of the embodiment, a printing portion 24 is formed at the upper edge of the bag. The printing portion 24 is set in a region sandwiched between the seal portion 24 and the folded portion 5a and has a closed bag shape. In addition, since the side edge portion is also closed by the thermal fusing portion 8a, the printing portion 24 is in a form in which the film is not turned up and does not lose its shape. As a result, there is also obtained an effect that when a product is displayed or the like, the product has a very good appearance.

In the manufacturing method of the above embodiment, a double-sized tubular film 5 was used to obtain two packaging bags in the width direction. However, as shown in FIG. 4, only one side was folded and the folded end was formed. It is also possible to manufacture using a long folded film 40 that is superimposed.
40a is a folded portion, and 40b is an overlapping end.

Also in this embodiment, the sealing portion 22 formed by the heat sealing body heat seals three sides except the overlapping end 40b which is the opening side of the packaging bag. The heat seal body provided with the seal portion 22 may be a heat seal member that can seal the U-shape from the folded portion 40a to the printing portion 24 and to the overlapping end 40b. After the sealing portion 22 is provided by the heat sealing body, the middle of the sealing portion 22 is sequentially thermally fused by the hot fusing blade 8 so that the same packaging bag 30 as shown in FIG.
Can be obtained. According to the method of this embodiment, there is an advantage that the cutting of the film by the cutter 7 becomes unnecessary.

As described above, the method of manufacturing a plastic packaging bag according to the method of the present invention can efficiently produce a packaging bag in the same manner as in the conventional method. There is an advantage that it can be reliably manufactured. Further, since the packaging bag according to the present invention is excellent in hermeticity, it can be suitably used as a packaging bag that needs to maintain the freshness of mushrooms or fresh vegetables, and can be provided as a good-looking packaging bag.

[0023]

According to the method of manufacturing a plastic packaging bag according to the present invention, the folded portion of the film does not appear in the sealed portion of the packaging bag, regardless of whether the tubular film is used or the folded film is used. By forming the storage area of the product by heat sealing, a plastic packaging bag having excellent sealing performance can be obtained, and the production is easy. Also,
Since the plastic packaging bag according to the present invention has good sealing performance, it can be suitably used as a packaging bag for products and the like that require high sealing properties such as mushrooms. In addition, the present invention has a remarkable effect that it can be provided as a good-looking packaging bag in a packaged state.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a method for manufacturing a plastic packaging bag according to the present invention.

FIG. 2 is an explanatory view showing an arrangement of a seal portion and the like provided on a tubular film.

FIG. 3 is a perspective view of a plastic packaging bag.

FIG. 4 is an explanatory view showing another embodiment of the method for manufacturing a plastic packaging bag.

FIG. 5 is an explanatory view showing a conventional method for manufacturing a plastic packaging bag.

FIG. 6 is an explanatory view showing a conventional example of a plastic packaging bag.

[Explanation of symbols]

 Reference Signs List 5 tubular film 5a folded portion 7 cutter 8 heat fusing blade 8a heat fusing portion 9 packaging bag 10 opening 13 bottom 20 heat sealing body 22 sealing portion 24 printing portion 30 packaging bag 30 opening side 40 folded film 40a folded portion 40b overlap end

Claims (3)

(57) [Claims] 1. A method for producing a plastic packaging bag by continuously producing a plastic packaging bag using an elongated body of a tubular film formed with a width dimension corresponding to two widths of the packaging bag, wherein the tubular film is While being intermittently transported according to the size of the packaging bag to be manufactured, by heat sealing with a heat sealing body in a rectangular frame shape on the tubular film according to the size of the sealing range of the packaging bag. A sealing portion provided on a destination side of the heat sealing portion, which is cut in a longitudinal direction at a center portion in a width direction of the tubular film; and a sealing portion provided at a predetermined interval on a side ahead of the cutting position. A method for producing a plastic packaging bag, characterized in that a plastic packaging bag whose three sides other than the opening side are heat-sealed by thermally fusing an intermediate position adjacent to the plastic packaging bag. 2. A method of manufacturing a plastic packaging bag in which a plastic packaging bag is continuously manufactured by using a long film of a folded film formed in a width dimension of one packaging bag, wherein the folded film is to be manufactured. Excluding the overlapping end of the folded film according to the size of the sealed area of the packaging bag while intermittently transporting according to the size of the packaging bag.
The sides are heat-sealed to form a seal portion. On the destination side of the heat seal portion, the adjacent intermediate positions of the seal portions provided at regular intervals are thermally blown, so that the three sides other than the opening side are cut off. A method for producing a plastic packaging bag, characterized in that a heat-sealed plastic packaging bag is obtained. 3. A housing portion is provided in which three sides excluding an opening side are sealed in a U-shape by a series of sealing portions formed by a linear heat seal, and a side facing the opening side is a plastic film. And a printed portion is provided between the folded portion and the seal portion, and opposite side edges except for the opening side and the folded portion are thermally fused. Packaging bag.