JP4454756B2 - Method for simultaneous thermal fusion bonding of resin film materials having different conditions and resin film bag made by this method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, for example, a part having different conditions of a part to be heat-sealed, such as a heat-sealing part of a resin film bag manufactured using a resin film material made of an easily fusible material such as a polyethylene film. The present invention relates to a method for simultaneous heat fusion of different-condition resin film materials suitable for heat fusion at the same time, and a resin film bag produced by this method.
[0002]
[Prior art and problems to be solved by the invention]
In general, a resin film material made of an easily fusible material such as a polyethylene film is often used as a material for a resin film bag such as a packaging bag for wrapping a product because of its easy fusibility.
[0003]
In such a packaging bag, a gusset portion is provided in order to wrap a large amount of product, or printing for product explanation or the like is performed over almost the entire surface.
[0004]
FIG. 7 shows an example of this type of packaging bag A. FIG. This packaging bag A is provided with a gusset portion 2 consisting of gusset halves 2a and 2b by bending the upper end portions of the two side members 1a and 1b inside and back, and the gusset halves 2a, whose inner surfaces are opposed to each other, 2b and the upper end portions of the side members 1a and 1b are separately heat-sealed at predetermined positions to provide the top seal portions 3a and 3b, and both end portions of the side members 1a and 1b and the gusset halves 2a and 2b are connected to the side member 1a. 1b is formed into a bag shape by heat sealing over the entire length of 1b and applying side seal portions 4a and 4b. Thick polyethylene film band-like grips 5a and 5b are heat-sealed to the portions from the upper ends of the gusset halves 2a and 2b to the top seal portions 3a and 3b, respectively. In the packaging bag A, a product such as a paper diaper is filled in a compressed state, and the lower end portions of the side members 1a and 1b are heat-sealed and packaged.
[0005]
In the packaging bag A filled with the product in this way, the restoring repulsion force from the product filled in the compressed state acts as a force that destroys the thermal fusion of each thermal fusion part. In the packaging bag A having the above-described configuration, both side members 1a so that the products filled therein extend the gusset halves 2a and 2b inside the top seal portions 3a and 3b in a straight line as shown in FIG. In order to widen 1b, excessive tension acts on the part where the side members 1a, 1b and the gusset halves 2a, 2b of the side seal portions 4a, 4b are heat-sealed for a long time. Finally, as shown in FIG. 8, the gusset halves 2a and 2b may be peeled off to generate a peeling portion B.
[0006]
When such peeling part B generate | occur | produced, there existed a problem that the beauty | look of the external appearance of the packaging bag A might be impaired and the fall of the commercial value of a product might be caused.
[0007]
The reason for this occurrence of peeling is that the surface of the packaging bag A is printed. This is because the surface of the bag A is printed with product PR, standard indications, safety precautions, etc., but in order to promote the adhesion between the ink used for the printing and the polyethylene film, Surface treatment such as corona discharge is applied to the surface of the film. This is because a carbonyl group is generated on the film surface during the surface treatment, and the carbonyl group and the hydroxyl group in the air are combined to reduce the sealing strength. In the peeling part B, the joining surfaces of the side members 1a and 1b and the gusset halves 2a and 2b are heat-sealed with easily fusible surfaces that have not been subjected to surface processing, so that they are sufficiently strong. Although the inner gusset halves 2a and 2b are heat-sealed with the hardly-fusible surfaces that have been subjected to surface processing, the heat-sealing strength is weakly peeled off. It was an end.
[0008]
The heat-sealing of the side seal portions 4a and 4b is performed by sandwiching the side members 1a and 1b and the gusset halves 2a and 2b with a seal surface of a pair of heaters having a length over the entire length of the side seal portions 4a and 4b. Although heat fusion is performed simultaneously by heat compression, an attempt was made to increase the heat fusion strength by adjusting the heating temperature, compression strength, and compression time to prevent the occurrence of the peeling portion B. Although the heat-sealing strength of the two parts is increased, inconveniences such as heat-cutting of the other parts occur, and the heat-sealing strength of only the gusset 2 part and the side members 1a and 1b can be used. It was impossible to keep the heat-sealing operation while maintaining the heat-sealing conditions at such values. Further, the side seal portions 4a and 4b may be divided into a portion having a gusset 2 portion having different heat fusion conditions and a portion not having a gusset 2 portion, and sealing may be performed in two steps. In addition, the process management for performing heat fusion at an appropriate position becomes complicated, and further, the number of processes increases, the production efficiency decreases, and it becomes a factor of high cost, so it cannot be adopted.
[0009]
Further, in order to reinforce the heat-sealing strength of the gusset half portions 2a, 2b in the side seal portions 4a, 4b, as shown in FIG. 9, the side members 1a, 1b and It has also been proposed that the gusset halves 2a and 2b are separately thermally fused to form the auxiliary seal portions 6a and 6b. However, when the oblique auxiliary seal portions 6a and 6b are formed, wrinkles are concentrated on the auxiliary seal portions 6a and 6b when the product is filled, the printed content becomes difficult to read, and the appearance quality is lowered. It was a thing.
[0010]
The present invention has been made in view of these points, and in the case where heat fusion is performed on a resin film material, portions having different conditions for the portions to be thermally fused are simultaneously heated with appropriate and sufficient heat fusion strength. To provide a method for simultaneous thermal fusion of different-condition resin film materials that can be fused, and to provide a resin film bag formed by this method with adequate and sufficient thermal fusion strength. Objective.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the simultaneous heat-sealing method of the different-condition resin film material according to claim 1 of the present invention comprises two sheets of easily-fusible materials having one surface subjected to hardly-fusible treatment. The resin film materials are laminated together with the easily fusible surfaces, the hardly fusible treated surface is aligned with a part between these two resin film materials, and the respective easily fusible surfaces of the two resin film materials are aligned. In a simultaneous heat-sealing method for different-condition resin film materials, in which a plurality of resin film materials having a combined portion in which two other resin film materials are laminated so as to match the easily-fusible surface are heat-sealed simultaneously In the case where the plurality of resin film materials are sandwiched by a seal surface to which a pair of heater anti-fusing materials are attached and heat-pressed at the same time, four resins on at least one seal surface are used. Heat-bonding is performed by attaching an anti-fusing material for difficult-to-fuse parts that reduces the heat-bonding distance to the heat-sealed part of the film material. By Succoth, two said four resin film material portions by four thermocompression bonding distance of the resin film material was smaller than the thermocompression bonding distance of the two resin film material thermocompression bonding simultaneously the combination portion The resin film material portion is heat-sealed with sufficient heat-sealing strength.
[0012]
According to such a method of the present invention, the thermocompression bonding distance is adjusted, that is, the thermocompression bonding distance of the four resin film materials in the combined portion is adjusted to be smaller than the thermocompression bonding distance of the two resin film materials. By simultaneously thermocompression bonding, the four resin film material portions and the two resin film material portions can be heat-sealed with sufficient heat-sealing strength. Furthermore, if the combination portion is provided, even if the number of laminated resin film materials is equal to or greater than the number of the combination portions, good heat fusion is similarly applied , and a hardly fused portion is formed on the seal surface of the heater. By attaching the anti-fusing material for use, the four resin film material portions and the two resin film material portions can be heat-sealed with sufficient heat-sealing strength.
[0015]
Also, simultaneous thermal fusion method of different conditions resin film material of the present invention according to claim 2, surface treatment for Oite to claim 1, NanToruchaku-processed to perform printing on the surface of the resin film material It is characterized by being.
[0016]
Thereby, even if the fusing property of the resin film material is deteriorated due to the surface treatment for printing, it is possible to perform heat fusing with sufficient heat fusing strength.
[0019]
Moreover, the resin film bag of the present invention according to claim 3 is provided with a heat-sealed portion in which a gusset portion is provided in a part between two side members, and the end portions of both side members and the gusset portion are heat-sealed. The side member is formed by laminating two resin film materials made of an easily fusible material, which has been subjected to a hardly fusible process on one surface, with the easily fusible surfaces aligned. The gusset portion is formed by laminating two resin film materials so that the hardly fusible surfaces are matched and the easily fusible surfaces are matched with the easily fusible surfaces of the both side members. In the case where the plurality of resin film materials are sandwiched between the sealing surfaces to which a pair of heater anti-fusing materials are attached and heat-pressed at the same time, at least one of the sealing surfaces 4 Prevention of fusion for difficult-to-fuse parts by reducing the thermocompression bonding distance to the heat-fusing part of a sheet of resin film material It is subjected to thermal fusion by impregnation, the side members and the four thermocompression bonding distance of the resin film material made of gusset portion, to be smaller than the thermal bonding distance of the two resin film material consisting of the side member The four resin film material portions and the two resin film material portions are heat-sealed with sufficient heat-sealing strength by thermocompression bonding at the same time.
[0020]
By forming in this way, the resin film bag provided with the gusset portion having the hardly-fusible treated surface can be heat-sealed with sufficient heat-sealing strength to be of high quality, and further the heater By attaching an anti-fusing material for the difficult-to-fuse part to the sealing surface of this, the four resin film parts having the gusset part and the two resin film parts were thermally fused with sufficient thermal fusion strength. A resin film bag can be obtained.
[0021]
According to a fourth aspect of the present invention, there is provided the resin film bag according to the third aspect , wherein the heat of the four resin film materials heat-sealed with a thermocompression distance that is smaller than the thermocompression distance of the two resin film materials. The property of the surface of the resin film material in the fused portion is different from the property of the surface of the resin film material in the other heat-fused portion.
[0022]
As a result, the surface properties of the resin film material at the heat-sealed portion of the four resin film materials are different from the properties of the surface of the resin film material at the other heat-sealed portion. It is possible to easily determine whether or not the heat-sealing portion of the heat-sealed portion of the sheet of resin film material is sufficient.
[0023]
Further, the resin film bag according to claim 5 is characterized in that, in claim 3 or claim 4 , the hardly fusible treatment is a surface treatment for printing on the surface of the resin film material.
[0024]
Thereby, even if the fusion property of the resin film material is deteriorated due to the surface treatment for printing, it is possible to obtain a resin film bag made by heat fusion with sufficient heat fusion strength.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0028]
FIG. 1 shows the steps of the production method of the present invention when a packaging bag A is produced as a resin film bag. The same parts as those in the prior art are denoted by the same reference numerals.
[0029]
In FIG. 1, the packaging bag A is subjected to manufacturing operation processing in each process while transporting a resin film material having a predetermined printing on the surface from right to left, until the side seal and the cutting process position are reached. The gusset halves 2a and 2b are folded between the members 1a and 1b, and the top seal portions 3a and 3b are further heat-sealed. At the side seal and cutting step position, the side seal portions 4a and 4b of the adjacent packaging bags A and A are heat-sealed according to the method of the present invention, and then the center portion is cut. As a result, the packaging bag A with the bottom portion released is continuously produced.
[0030]
At the side seal and cutting step positions, the side seal portions 4a and 4b are heat-sealed by a pair of metal bar-shaped upper heater 11a and lower heater 11b. A pair of parallel elongated heat projections 12a and 12b are integrally formed on opposing surfaces of the upper heater 11a and the lower heater 11b in accordance with the positions of the side seal portions 4a and 4b, respectively. Further, glass tapes 13a and 13b as adhesion preventing materials for preventing the heat protrusions 12a and 12b from being fused to the surfaces of the side members 1a and 1b are attached to the surfaces of the heat protrusions 12a and 12b, respectively. Surfaces 14a and 14b are formed. The glass tapes 13a and 13b used in the present embodiment have a thickness of about 80 to 130 μm and are formed by coating a tetrafluoroethylene resin on both surfaces of the glass fiber. Further, in the present embodiment, four resin film materials are bonded to the heat-sealed portion at a position corresponding to the inner portion of the top seal portions 3a, 3b of the gusset 2 on the surface of the glass tape 13a of the upper heater 11a. A glass tape 15 made of the same material as described above is attached as an anti-fusing material for the hard-to-fuse part that reduces the thermocompression bonding distance. The glass tape 15 as the anti-fusing material for the difficult-to-fuse part may be provided on the other lower heater 11b side, or may be provided on both heaters 11a and 11b. Various materials such as a metal thin film other than the glass tapes 13a, 13b, and 15 can be used as the anti-fusing material.
[0031]
Next, the heat sealing | fusion process of each side seal part 4a, 4b is demonstrated.
[0032]
When the resin film material before the side seal process reaches and stops at the side seal and cutting process positions in FIG. 1, the upper heater 11a and the lower heater 11b that are separated from each other are brought closer to each other, as shown in FIG. Thus, the space | interval of the sealing surfaces 14a and 14b which consists of the surface of a pair of glass tapes 13a and 13b, ie, the thermocompression bonding distance, is sufficient heat fusion of the two side members 1a and 1b except the gusset halves 2a and 2b. The two side members 1a and 1b are moved by the upper heater 11a and the lower heater 11b which are moved to a size D suitable for heat fusion with strength and stopped at the position for a predetermined time and heated to a predetermined temperature. Is heat-sealed. At the same time, in the part where the gusset halves 2a and 2b are interposed between the side members 1a and 1b to which the glass tape 15 is attached, as shown in FIG. The heat sealing process is performed with a thermocompression bonding distance d that is smaller than the thermocompression bonding distance D of the sheet of resin film material by the thickness of the glass tape 15. In the present embodiment, for example, four resin film materials having a thickness of 360 μm are extremely thinned to a thermocompression bonding distance d of 60 μm and heat-sealed. Due to this ultra-thin heat fusion, the surface treatment for printing applied to the surface side of the gusset halves 2a, 2b, that is, the hard-to-fusing treatment portion of the resin film material is once dissolved and mixed at the time of heat fusion. Then, since it is cooled and solidified, one film is formed, and the heat fusion strength is increased and the heat fusion strength is sufficient. When the heat sealing of the side seal parts 4a and 4b is completed, the intermediate part of the side seal parts 4a and 4b is thermally fused by a cutter (not shown) to produce the packaging bag A.
[0033]
Next, the strength of heat fusion of the gusset portion 2 by the glass tape 15 will be further described.
[0034]
According to the method of the present invention, the side seal portions 4a and 4b of the five packaging bags A using the polyethylene film having a thickness of 90 μm are heated at the heaters 11a and 11b at 290 ° C., and the thermocompression bonding distance d is 60 μm. Heat fusion was performed for a time of 0.39 seconds, and as a comparative example, the heat-bonding distance D was set to 190 μm by the heaters 11a and 11b in a state where the glass tape 15 was removed from five packaging bags, and the other heat fusion was performed. Heat sealing was performed under the same conditions. And as a measurement (peeling test) of the thermal fusion strength, in the constant temperature and humidity chamber maintained at a temperature of 40 ° C. and a humidity of 90%, either one of the side seal portions 4a and 4b is used as a test piece in the middle. One of the test pieces obtained by cutting the members 1a, 1b and the gusset halves 2a, 2b over 15 mm (± 1 mm) (length in the seal length direction) × 50 mm is fixed, and a 1 kg weight is stationary on the other. The time until the seal part of the half gussets 2a and 2b was peeled was measured.
[0035]
The heat-sealed part heat-sealed using the glass tape 15 according to the method of the present invention did not peel at all in both the side seal parts 4a and 4b in the five packaging bags A even after 24 hours. On the other hand, in the comparative example, it peeled in 0.5 to 1 hour.
[0036]
Moreover, it is a part remove | deviated from the glass tape 15 adjacent to the heat sealing | fusion part heat-sealed using the glass tape 15 by this invention method, Comprising: A total of 4 sheet parts of the side members 1a and 1b and gusset half parts 2a and 2b When the same peeling test was performed on the heat-sealed part, the film was peeled off in 0.5 to 1.0 hour.
[0037]
From the results of these peel tests, according to the method of the present invention, the side members 1a, 1b and the gusset halves 2a, 2b can be heat-sealed with sufficient heat-sealing strength using the glass tape 15. Has been demonstrated. That is, in the present embodiment, even if the fusing property of the resin film material is deteriorated due to the surface treatment for printing on the gusset halves 2a and 2b, heat fusion is performed with sufficient heat fusion strength. The packaging bag A having a high commercial value can be manufactured.
[0038]
According to the present invention, the glass tape 15 as the anti-fusing material for the difficult-to-fuse part that reduces the thermocompression bonding distance is attached to the heat-fusing part of the four resin film materials, and the others are heat-fusing as in the conventional case. By wearing, a high-quality packaging bag A can be stably and easily manufactured at low cost using a conventional manufacturing apparatus.
[0039]
More specifically, as shown in FIG. 5 and FIG. 6, the portion E heat-sealed by the glass tape 15 is formed with irregularities 16 that can be visually recognized on the surface, and the other portion F is relatively flat. Is formed. Thus, when heat-sealing according to the method of the present invention, for example, the surface properties of the resin film material at the heat-sealed portion such as the irregularities 16 are different from the properties of the surface of the resin film material at other heat-sealed portions. And can be heat-sealed. Therefore, it is easy and reliable to determine whether the gusset portion 2 is sufficiently heat-sealed by detecting whether there is a difference in properties, that is, whether the irregularities 16 are formed. Can do. This determination can also be made automatically by detecting the presence or absence of the irregularities 16 with a CCD camera or the like. Therefore, the burden on the production worker can be reduced. Needless to say, the contents of the change in properties include any other contents.
[0040]
Furthermore, since the heat-sealing strength of the part heat-sealed by the glass tape 15 is sufficient, there is no need to provide the oblique auxiliary seal portions 6a and 6b that have been proposed in the past. It is possible to reduce trouble occurrence opportunities, improve production efficiency, and reduce costs. In addition, since there is no oblique auxiliary seal portion, wrinkles are not generated and the printed portion is not easily seen, and a packaging bag having a high-quality appearance can be provided.
[0041]
Furthermore, according to the present invention, there is a defect in production in the conventional method, that is, a fusing failure of a seal part other than the gusset 2 part, an adhesion failure between side seal parts of adjacent packaging bags, or a resin attached to a cutter. It is possible to eliminate defects caused by the production stop necessary for the removal process.
[0042]
In addition, this invention is not limited to the said embodiment, It can change as needed. For example, in the above-described embodiment, separate glass tapes 13b and 13b are attached to the pair of heat projections 12b and 12b of the lower heater 11b, respectively, but the glass tape is unwound from a roll-shaped glass tape material. Is applied to the upper surface of the pair of heat projections 12b, 12b in a continuous state and used for heat fusion, and a new glass tape of the roll-shaped glass tape material is used every time the heat fusion is performed a predetermined number of times. The part may be unwound and replaced. Moreover, in the said embodiment, although the case where the packaging bag A provided with four resin film material parts and two resin film material parts was manufactured according to this invention method was shown, the manufacturing method of this invention According to the above, if the combination part of the four sheets and the two sheets is further provided, even if the number of laminated resin film materials is equal to or greater than the number of the combination parts, depending on the degree of different heat-sealing conditions By making the thermocompression bonding distances different, it is possible to satisfactorily heat-seal portions having different heat-sealing conditions in the same manner as in the above embodiment.
[0043]
【The invention's effect】
Since the present invention is configured and operates in this way, when heat-sealing a resin film material, heat the portions with different heat-welding conditions at the same time with appropriate and sufficient heat-sealing strength. It is possible to obtain a resin film bag formed with an adequate and sufficient heat-sealing strength by this method.
[0044]
Specifically, according to the simultaneous heat-sealing method of the different-condition resin film material of the present invention described in claim 1, the thermocompression bonding distance is adjusted, that is, the four resin film materials in the combination part are adjusted. By adjusting the thermocompression bonding distance to be smaller than the thermocompression bonding distance of the two resin film materials and simultaneously thermocompression bonding, the four resin film material portions and the two resin film material portions are sufficiently heat-sealed. It can be heat-sealed with strength. Furthermore, if the combination portion is provided, good thermal fusion can be performed similarly even if the number of laminated resin film materials is equal to or greater than the number of the combination portions. Furthermore, by attaching an anti-fusing material for the hard-to-fuse part to the seal surface of the heater, the four resin film parts and the two resin film parts are simultaneously heat-sealed with sufficient heat-sealing strength. be able to.
[0046]
Further, according to the method of the present invention as set forth in claim 2 , even if the fusing property of the resin film material is deteriorated due to the surface treatment for printing, the heat fusing is performed with a sufficient heat fusing strength. Can do.
[0048]
In addition, according to the resin film bag of the present invention according to claim 3 , high quality obtained by heat-sealing a resin film bag having a gusset portion having a hardly-fusible treated surface with sufficient heat-sealing strength. it can be obtained as those of. Furthermore, by attaching an anti-fusing material for the difficult-to-fuse part to the seal surface of the heater, the four resin film material parts with the gusset part and the two resin film material parts can be bonded with sufficient heat fusion strength. A heat-sealed resin film bag can be obtained.
[0049]
According to the resin film bag of the present invention as set forth in claim 4 , the surface property of the resin film material of the heat fusion part of the four resin film materials is the same as that of the resin film material of the other heat fusion part. Since it is different from the surface properties, it can be easily determined whether or not the heat-sealing portions of the four resin film materials are sufficient depending on the difference in properties.
[0050]
According to the resin film bag according to claim 5 , even if the fusion property of the resin film material is deteriorated due to the surface treatment for printing, the thermal fusion is performed with sufficient thermal fusion strength. The obtained resin film bag can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing the steps of a simultaneous heat-sealing method for different-condition resin film materials of the present invention. FIG. 2 is a perspective view of a heater used in the method of the present invention. FIG. 3 is a side view of the heater of FIG. 4] Cross-sectional view of the heat-sealed portion of the present invention [Fig. 5] Enlarged perspective view of the heat-fused portion of the present invention [Fig. 6] Cross-sectional view taken along line VI-VI in Fig. 5 [Fig. FIG. 8 is a perspective view showing a peeled state of the side seal portion of FIG. 7. FIG. 9 is a front view showing another conventional example of a resin film bag.
1a, 1b Side member 2 Gazette part 2a, 2b Gazette half part 4a, 4b Side seal part 11a, 11b Heater 13a, 13b, 15 Glass tape 14a, 14b Seal surface 16 Concavity and convexity

Claims (5)

Two resin film materials made of an easily fusible material that has been subjected to an infusible treatment on one side are laminated together with the easily fusible surface, and hardly fusible to a part between these two resin film materials. A plurality of resins provided with a combination portion in which the other two resin film materials are laminated so that the easily treated surfaces are matched and the easily fusible surfaces are matched to the easily fusible surfaces of the two resin film materials. In the simultaneous heat-sealing method for different-condition resin film materials in which film materials are heat- sealed at the same time, the plurality of resin film materials are sandwiched by a sealing surface to which a pair of heater anti-fusing materials are attached and heated and compressed. When heat-sealing at the same time, heat-sealing is performed by attaching an anti-fusing material for hard-to-fuse parts that reduces the thermocompression bonding distance to the heat-sealing parts of the four resin film materials on at least one sealing surface. by the applied thermocompression bonding distance of two resin film material the four thermocompression bonding distance of the resin film material of said combination part A resin film material having different conditions, wherein the four resin film material portions and the two resin film material portions are heat-sealed with a sufficient heat-sealing strength by thermocompression bonding at a smaller size. Simultaneous heat fusion method.   The simultaneous heat-sealing method for different-condition resin film materials according to claim 1, wherein the hardly fusible treatment is a surface treatment for printing on the surface of the resin film material. In a resin film bag having a heat-sealed portion in which a gusset portion is provided in a part between two side members, and the end portions of both side members and the gusset portion are heat-sealed, the side member is hardly fused to one surface. It is formed by laminating two resin film materials made of an easily fusible material that has been subjected to adherence treatment so that the easily fusible surfaces are laminated. Are formed by laminating two resin film materials so that the easily fusible surfaces match the easily fusible surfaces of the both side members, and the plurality of resin film materials are formed of a pair of heaters. In the case of simultaneously heat-sealing by sandwiching a heat-pressing material with a sealing surface to which an anti-fusing material is attached and reducing the thermocompression bonding distance to at least one of the four resin film materials on the sealing surface. is subjected to thermal fusion impregnated with NanToruchaku unit for anti-blocking material, the side members Oyo By making the thermocompression bonding distance of the four resin film members made of the gusset portion smaller than the thermocompression bonding distance of the two resin film materials made of the side members, A resin film bag characterized in that two resin film material portions are heat-sealed with sufficient heat-sealing strength.   The properties of the surface of the resin film material of the four heat-bonded portions of the four resin film materials that are heat-bonded with a heat-bonding distance smaller than the heat-bonding distance of the two resin film materials are the other heat-bonded portions. The resin film bag according to claim 3, which is different from the surface property of the resin film material.   5. The resin film bag making according to claim 3, wherein the hardly fusible treatment is a surface treatment for performing printing on a surface of the resin film material.

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