JP3031782U - Plastic film bag - Google Patents

Abstract

(57) [PROBLEMS] To provide a three-side sealed plastic film bag that is stable and bulky ZU <, and is easy to open even when a large number of sheets are stacked and bundled for storage or transportation before being filled with articles. . SOLUTION: The plastic film bag is characterized in that both edge portions of a plastic film are vertically polymerized in a back seal portion, and both plastic films are heat-sealed in the polymerized portion.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a three-way sealed plastic film bag for packaging foods, medicines and other miscellaneous goods.

[0002]

[Prior art]

 Conventionally, a three-way sealed type plastic film bag has been used for packaging foods, medicines, and other miscellaneous goods. As shown in FIG. 8, the bag generally has a rectangular film made of plastic such as polyethylene or polypropylene with both ends 19 and 19 ′ joined together, and the inner surfaces 14 and 14 ′ are heat-sealed (hereinafter, “back”). Then, the heat-sealed product is folded as shown in FIG. 7, and one of the upper and lower edge portions of the heat-sealed product is heat-sealed (hereinafter, referred to as "lower sealing part 12"). ), By filling the desired product in the bag through the opening of the remaining edge (hereinafter referred to as “upper seal portion 13”), pasting the upper seal portion 13 and sealing the three sides. The product is packaged in a bag.

Generally, in the plastic film bag, the upper seal portion 13 is not heat-sealed, but the other two seal portions 11 and 12 are heat-sealed, and the product is traded as a product. Then, a desired article is filled in, and finally the upper seal portion 13 is heat-sealed.

However, in the above conventional method, when the lower seal portion 12 is heat-sealed, the back seal portion 11 is folded to either side. As a result, a total of four films overlap each other at the folded back seal portion 11, and when a large number of plastic film bags that have not been filled with articles are stacked and bundled into a bundle by banding or the like, the back seal portion 11 does not overlap. There was a problem that the whole part became swelled, it was unstable and bulky as a whole.

Further, when taking out the contents packaged in such a plastic film bag, as shown in FIG. 10, the back seal portion 11 and the portion immediately below the upper seal portion 13 (or the lower seal portion 12) and Grip the surface 16 that does not have the back seal portion 11 with a finger and pull the upper seal portion 13 (or the lower seal portion 12) to the left or right to open it, or open the bag on both sides of the back seal portion 11. The surfaces 15 and 15 'are opened by pulling the back seal portion 11 to the left and right so that the back seal portion 11 can be pulled apart. However, since the adhesion of the plastic film in recent years is strong, the method described above is used. Then it was not easy to open.

[0006]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a three-way sealed plastic film bag that is stable and bulky even when a large number of sheets are stacked and bundled for storage or transportation before being filled with articles. Another object of the present invention is to provide a three-way sealed plastic film bag which can be easily opened when taking out the contents.

[0007]

[Means for Solving the Problems]

 The above object is achieved by the present invention described below. That is, the present invention is a plastic film bag characterized in that both edges of the plastic film are vertically polymerized at the back seal portion, and both plastic films are heat-sealed at the polymerized portion.

[0008]

[Embodiment of device]

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a plastic film bag of the present invention, FIG. 2 is an expanded view of the bag, and FIG. 3 is a perspective view showing a manufacturing state of the bag. In the plastic film bag of the present invention, as shown in FIG. 3, a heat sealing agent layer is first formed by printing on a rectangular plastic film at a predetermined position, and the heat sealing agent layer is formed along the folding lines 7 and 7'to the front side ( Or, it is folded to the other side and overlaps so that the edge 9 on one side (the left side in FIG. 3) is on the bottom and the edge 9 ′ on the other side (the same right side) is on the top (note that The polymerization may be reversed), and the surfaces 4 and 4'of the polymerized film are heat-sealed to form the back seal portion 1 as shown in FIG. Further, if necessary, the lower side is heat-sealed to form the lower seal portion 2. In this way, the plastic film bag of the present invention is manufactured.

That is, according to the present invention, as shown in FIG. 1, since the back seal portion 1 is a state in which three films are overlapped as a whole bag, as shown in FIG. When a large number of bags are piled up, the degree of bulkiness is smaller than that of a conventional bag that has four overlapping back seal parts and the repulsive force generated by bending of the back seal parts remains. Further, in the present invention, as shown in FIG. 5, the upper plastic film of the back seal portion is heat-sealed to the lower plastic film excluding the outermost edge portion 8 thereof, as shown in FIGS. As shown in (4), it is easy to peel off the non-heat-sealed piece 8 with a finger, and thus the bag can be easily opened.

As the plastic film used in the present invention, any conventionally known plastic film can be used, but a polypropylene film is particularly suitable for the purpose of the present invention. In the plastic film bag of the present invention, the back seal portion 1 and the upper and lower seal portions 2 and 3 are heat-sealed by applying a heat-sensitive adhesive such as vinyl acetate resin to a predetermined seal portion of the film by an appropriate method, for example, gravure. The heat sealing agent layer may be formed by coating and drying by printing or the like, and the heat sealing agent layer may be used in a usual manner. When a plastic film having a heat-sealing property is used as the plastic film in the present invention, it is not necessary to use the heat-sealing agent as described above.

The size of the plastic film bag of the present invention is not particularly limited, and is appropriately designed according to the size and shape of the article to be filled. In the case of a general method of filling foods etc. as an article, the size of the bag is about 5 cm to 50 cm on one side. The back seal part 1 and the upper and lower seal parts 2 of the plastic film bag of the present invention. There is no particular limitation on the width to be heat-sealed in Nos. 3 and 3, and it is appropriately designed depending on the size of the entire bag, the size and weight of the article to be filled, the heat-sealing means and the like. The width of the back seal portion 1 and the upper and lower seal portions 2 and 3 is generally about 3 mm to 3 cm. The plastic film bag of the present invention also includes a plastic film bag having so-called gussets on both sides of the bag so as to increase the internal capacity, as long as it has the construction of the claims.

[0012]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a three-way sealed plastic film bag that is stable and bulky even when a large number of sheets are stacked and bundled for storage or transportation before being filled with articles. Further, when the bag is the same size as the conventional bag, the amount of the film used is reduced, which is advantageous in terms of cost. Further, according to the present invention, it is possible to provide a three-way sealed plastic film bag which can be easily opened when the contents are taken out.

[Brief description of drawings]

FIG. 1 is a plan view of a plastic film bag of the present invention.

FIG. 2 is a development view of the plastic film bag of the present invention.

FIG. 3 is a perspective view showing a production state of the plastic film bag of the present invention.

FIG. 4 is a view showing a state of heat sealing of a back seal portion of the plastic film bag of the present invention.

FIG. 5 is a perspective view showing an opened state of the plastic film bag of the present invention.

FIG. 6 is an enlarged view of the plastic film bag according to the present invention when it is opened, taken along the line AA.

FIG. 7 is a perspective view of a conventional plastic film bag.

FIG. 8 is a view showing a heat-sealed state of a back seal portion of a conventional plastic film bag.

FIG. 9 is a schematic view showing an opened state of the plastic film bag of the present invention.

FIG. 10 is a schematic diagram showing an opened state of a conventional plastic film bag.

[Explanation of symbols]

 1, 11: Back seal part 2, 12: Lower seal part 3, 13: Upper seal part 4, 4 ': Surface in contact with polymerization 5, 5': Left and right edge parts of plastic film

Claims (3)

[Scope of utility model registration request] 1. A plastic film bag characterized in that both edges of the plastic film are vertically polymerized at the back seal portion, and both plastic films are heat-sealed at the polymerized portion. 2. The plastic film bag according to claim 1, wherein the plastic film on the upper side of the back seal portion is heat-sealed to the lower plastic film except for the end edge portion. 3. The plastic film bag according to claim 1, wherein the plastic film is a polypropylene film.