JP6797558B2 - Packaging bag and its manufacturing method - Google Patents

Description

The present invention relates to a packaging bag for packaging various liquids and powders such as foods, chemicals, cosmetics, detergents, etc., and more specifically, for imparting morphological retention and making it easier to hold. It relates to a packaging bag provided with an air filling part (also referred to as an air bag or the like).

As a packaging bag for storing liquid detergent, shampoo, etc., a similar laminated film is conventionally folded at the lower end edge of two synthetic resin laminated films having an inner layer made of a sealant, and the upper end edge. At the same time, the left and right side edge edges and the lower end edge edge are heat-sealed, and a type of packaging bag that stands on its own when filled with contents is widely used.

Further, in such a synthetic resin packaging bag, the front and back synthetic resins are not heat-sealed at the side edge of the packaging bag for the purpose of enhancing morphological retention and independence. An air-filled path is provided so as to form a portion and communicate with the non-fused portion, and when filling the contents, an air-filled path is provided after injecting air into the non-fused portion from the air-filled path. There is also a product (standing pouch with an airbag) in which an air-filled airbag is formed by heat-sealing (Patent Document 1). According to the packaging bag with the airbag, since the airbag maintains a certain shape, not only the shape retention and independence of the entire packaging bag can be improved, but also the airbag portion can be gripped. It can provide good ease of holding.

JP-A-2009-12800

However, in the packaging bag with an airbag as in Patent Document 1, since the airbag is merely an inflated film originally flat by the pressure of air, it is displayed on a display shelf or the like for a long period of time. , Air disappears from the inside of the airbag (leaks to the outside), and the shape retention and independence deteriorate. In addition, once the bag is made, when the contents are filled, the airbag must be filled with air and then the air filling path must be heat-sealed to seal the airbag. There is also a problem that it takes time and effort.

An object of the present invention is to solve the problems of the conventional packaging bag with an airbag, and to prevent air from disappearing from the air-filled portion for a long period of time, so that the shape can be easily retained and held easily. Is to provide easy packaging bags. Another object of the present invention is to provide a manufacturing method capable of easily and inexpensively manufacturing a packaging bag in which air does not easily disappear from the air filling portion for a long period of time and the shape is easily retained and held easily. To do.

Of the present inventions, the invention described in claim 1 is formed in a bag shape by heat-sealing the peripheral edges of two synthetic resin sheets on the front and back surfaces, and air is inside at the left and right or upper and lower peripheral edges. This is a method for manufacturing a packaging bag in which an air-filled portion is formed, and the air-filled portion is formed so as to bulge outward from other portions at the left and right or upper and lower peripheral edges of the packaging bag. It has a filling part forming step , so that the air filling part forming step bulges outward from the other parts at the left and right or upper and lower peripheral edges of each of the two front and back synthetic resin sheets. The bulge portion forming step for forming the bulge portion and the two front and back synthetic resin sheets forming the bulge portion are overlapped so that the positions of the bulge portions match, and the bulges are formed. It has a heat-sealing step of heat-sealing the periphery of the portion, and the bulging portion forming step uses two pairs of molds provided with a recess and a degassing hole communicating with the recess, and two front and back surfaces. The synthetic resin sheet of No. 1 is heated, and at the same time or before and after the heating, the synthetic resin sheet is brought into close contact with the concave portion of each mold by suction from the degassing hole to form a bulging portion on each synthetic resin sheet. In addition, the heat-sealing step increases the internal pressure of the air-filled portion formed by heat-sealing the bulging portions formed on the two front and back synthetic resin sheets so as to be one size smaller. It is characterized by that.

The invention according to claim 2 is formed in a bag shape by heat-sealing the peripheral edges of two synthetic resin sheets on the front and back surfaces, and is filled with air at the left and right or upper and lower peripheral edges. A method for manufacturing a packaging bag in which an air-filled portion is formed, wherein the air-filled portion is formed so as to bulge outward from other portions at the left and right or upper and lower peripheral edges of the packaging bag. The air-filled portion forming step forms a bulging portion on the left and right or upper and lower peripheral edges of each of the two front and back synthetic resin sheets so as to bulge outward from the other portions. The bulging portion forming step and the two front and back synthetic resin sheets forming the bulging portion are overlapped so that the positions of the bulging portions match, and the periphery of the bulging portion is heated. It has a heat-sealing step of sealing, and the bulging portion forming step heats two synthetic resin sheets on the front and back using a pair of dies provided with recesses, and heats the sheets. At the same time or before and after, air is blown into the recesses of each mold to form a bulging portion on each synthetic resin sheet, and the heat sealing process is performed on two front and back synthetic resin sheets. It is characterized in that the internal pressure of the air-filled portion formed is increased by heat-sealing the bulging portion formed on the sheet so as to be one size smaller .

According to the method for manufacturing a packaging bag according to claims 1 and 2 , an air-filled air-filled portion is formed in the packaging bag without blowing air into the air-filled portion after bag-making as in the conventional case. Therefore, it is possible to easily manufacture a packaging bag having good shape retention and ease of holding for a long period of time.

According to the method for manufacturing a packaging bag according to claims 1 and 2 , the air-filled portion can be formed so as to clearly bulge with respect to other portions, so that the inside of the air-filled portion can be formed for a long period of time. It is possible to efficiently manufacture a packaging bag in which air does not easily disappear from the bag and the shape retention and ease of holding are very good.

According to the method for manufacturing a packaging bag according to claims 1 and 2 , since the bulging portion can be formed into a uniform shape in a short time, air is unlikely to disappear from the air filling portion for a long period of time. A packaging bag having very good morphological retention and ease of holding can be manufactured at low cost and with good yield.

According to the method for manufacturing a packaging bag according to claims 1 and 2 , it is possible to easily manufacture a packaging bag in which the internal pressure of the air-filled portion is high and the shape retention and ease of holding are extremely good.

It is explanatory drawing which shows the packaging bag ((a) is a front view, (b) is the end view of line AA in (a), (c) is the end view of line BB in (b). is there). It is a flowchart which shows the manufacturing process of a packaging bag. It is explanatory drawing which shows the manufacturing method of the packaging bag. It is explanatory drawing which shows the mold used for forming an air filling part ((a) is a front view, (b) is a sectional view taken along the line CC in (a)). It is explanatory drawing (CC line cross section in FIG. 4A) which shows the state of forming an air filling part ((a) shows the state of forming a bulging part, (b) is a preliminary It shows how to heat seal). It is explanatory drawing which shows the modification example of the manufacturing method of a packaging bag.

Hereinafter, an embodiment of a packaging bag and a method for producing the same according to the present invention will be described in detail. The packaging bag according to the present invention is formed of a synthetic resin sheet. The synthetic resin sheet referred to here is a laminated film in which a synthetic resin film is laminated, a laminated film in which a synthetic resin film is laminated with paper, aluminum foil, or the like, a coextruded film, or the like. The synthetic resin sheet used for the packaging bag according to the present invention needs to have at least one side (inner surface) of heat adhesiveness.

As such a synthetic resin sheet, a laminated film or the like in which a heat-adhesive film such as a polyethylene film or a polypropylene film is laminated on a base film such as a polyester film, a nylon film or a polypropylene film can be preferably used. Further, a laminated film having three or more layers in which a polyester film, a nylon film or the like is sandwiched between such laminated films can also be preferably used.

As the base film and the film forming the intermediate layer, an unstretched film can be used, or a uniaxially stretched film or a biaxially stretched film can be used. Further, a metal foil is required at the interface between the base film and the heat-adhesive film, the interface between the base film and the film forming the intermediate layer, and the interface between the film forming the intermediate layer and the heat-adhesive film. It is also possible to provide a layer, a metal vapor deposition layer, a transparent vapor deposition layer made of silicon oxide, aluminum oxide (alumina), or the like. On the other hand, the thickness of the synthetic resin sheet is not particularly limited, but is preferably 40 to 250 μm, more preferably 110 to 180 μm, from the viewpoints of storage performance for the contents, tear resistance and the like.

In the packaging bag according to the present invention, the above-mentioned synthetic resin sheets are laminated in a predetermined manner, and at least a side portion, a bottom portion (lower portion), and a part of an upper portion (head) of the laminate are heat-sealed. It is formed by cutting into a predetermined shape and size. Further, in the production of the packaging bag according to the present invention, when the bag is manufactured as described above, an air filling portion (air) that bulges outward is provided at at least one of the left and right or upper and lower peripheral edges of the packaging bag. It is necessary to form a hollow portion filled with (air filling portion forming step). Further, the air-filled portion includes a step of forming a bulging portion (a portion bulging outward) on the synthetic resin sheet by a method such as a vacuum forming method or a pressure forming method (a bulging portion forming step), and a step of forming the bulging portion. The two synthetic resin sheets on which the bulging portion is formed are heat-sealed by aligning the positions of the bulging portion, thereby forming an air filling portion near the periphery of the packaging bag (heat sealing step). It is preferable to do so. In addition, when forming a bulging portion (a portion bulging outward) on a synthetic resin sheet using a vacuum forming method or a compressed air forming method, the synthetic resin sheet is heated and softened. It is possible to mold the bulging part, and it is also possible to mold the bulging part while heating the synthetic resin sheet (almost at the same time as heating) when heat-sealing the periphery of the synthetic resin sheet. Is.

The air-filled portion formed as described above has a function of improving the shape retention and independence of the packaging bag (particularly when the content is reduced) and providing good holdability. Further, the air filling portion can be in the shape of a straight or curved rod, or a plurality of spheres or elliptical spheres arranged in a straight line.

Further, the packaging bag according to the present invention may be one in which a reinforcing layer for preventing shape loss is laminated on the bulging portion of the synthetic resin sheet. As a means for providing such a reinforcing layer, an energy ray-curable resin such as an ultraviolet curable resin, an electron beam curable resin or a thermosetting resin is applied to one or both sides of the front and back surfaces of the synthetic resin sheet, or the synthetic resin sheet has rigidity. A method of sticking a resin piece can be adopted. The ultraviolet curable resin used in that case includes an ester acrylate obtained by reacting phthalic acid / 1,6-hexanediol / acrylic acid, a urethane acrylate obtained by reacting tolylene diisocyanate / βHPA / polyester or a polyol, and an epoxy. Epoxy acrylate to which glycidyl group and acrylic acid of the compound are added, acrylate formed by reacting melamine-formaldehyde condensate or urea-formaldehyde condensate with N-methylol acrylamide or β-hydroxyethyl acrylate, carboxylic acid group or epoxy Acrylate resin acrylate obtained by reacting an acrylic polymer having a functional group such as a group with an acrylate having a group (functional group) capable of reacting with those functional groups, an esterified product of α, β-unsaturated dicarboxylic acid and a polyol (ester). Examples thereof include those mainly composed of photopolymerizable oligomers such as a mixture of (unsaturated polyester) and styrene. Further, examples of the electron beam curable resin include an acryloyl compound and the like. On the other hand, examples of the thermosetting resin include epoxy resin, unsaturated polyester resin, urea resin, melamine resin, polyurethane resin and the like.

Further, when the resin piece is attached, a method of heat-adhering a rigid resin film or a method of attaching with an adhesive or the like can be adopted. Specifically, a method of thermally adhering a rigid resin film such as polyester (PET), polypropylene (PP) or nylon (NY) having a thickness of about 50 to 500 μm, or a method of adhering with an adhesive or the like. Can be adopted. Further, the stacking position of the reinforcing layer is not particularly limited and may be either one side or both sides of the inner surface and the outer surface of the synthetic resin sheet, but in order to improve the appearance of the formed packaging bag, the synthetic resin is used. It is preferably provided on the inner surface of the sheet. In addition, the shape of the reinforcing layer is not particularly limited, and the reinforcing layer can be formed so as to have the same shape as the bulging portion formed on the front and back synthetic resin sheets, and the bulging can be formed. It is also possible to form a reinforcing layer one size smaller than the portion, or to form a reinforcing layer one size larger than the bulging portion. As described above, when the reinforcing layer is laminated on the bulging portion of the synthetic resin sheet, the shape of the formed air-filled portion is extremely difficult to collapse, so that the shape of the packaging bag is extremely good. There is a merit that it becomes.

Further, the packaging bag according to the present invention may have a metal or the like vapor-deposited on the inner surface of the bulging portion of the synthetic resin sheet. In this way, when metal or the like is deposited on the inner surface of the bulging portion of the synthetic resin sheet, it becomes difficult for air to escape from the air filling portion, so that the shape of the packaging bag is maintained as in the case where the reinforcing layer is provided. There is an advantage that the sex is extremely good.

Further, the bag form of the packaging bag according to the present invention is not particularly limited, and examples thereof include a standing pouch, a gusset bag, a three-sided bag, and the like, and the size thereof is not particularly limited.

In addition, each heat seal (side seal, lower seal, etc.) and cutting can be performed as a series of processes using a bag making machine, or can be performed as a batch (non-series) process. It is possible. The temperature of the heat seal is not particularly limited, but when a synthetic resin sheet using a polyethylene (linear low-density polyethylene) film as a heat-adhesive film is used, the temperature should be within the range of 170 to 210 ° C. Is preferable.

Hereinafter, a manufacturing example of the packaging bag of the present invention and a manufacturing method thereof will be described.

<Packaging bag configuration>
FIG. 1 shows an example of the packaging bag of the present invention. In the packaging bag P, a 12 μm-thick polyester film (intermediate layer) with aluminum vapor deposition is laminated on a 15 μm-thick nylon film (base film) so that the aluminum vapor-deposited surface is bonded to the nylon film. Further, it is formed of a synthetic resin sheet formed by laminating a linear low-density polyethylene film (heat-adhesive film) having a thickness of 130 μm on it, and has a size of length × width = 265 mm × 170 mm. ing.

Further, the folding material 3 is sandwiched between the lower end edges of the two substantially rectangular body members 2a and 2b on the front and back sides of the packaging bag P in a state of being folded in half with a predetermined width (about 50 mm width). .. The front and back body materials 2a and 2b are arranged with the linear low-density polyethylene film (heat-adhesive film) layer inside, and the folding material 3 is a linear low-density polyethylene film. The layers are arranged on the back side of the front and back body members 2a and 2b.

The side seal portions 5a and 5b are formed by heat-sealing the left and right edge portions of the packaging bag P. In the upper portion of the side seal portions 5a and 5b (the portion above the folded portion of the folding material 3), the back surface of the body material 2a on the front side and the back surface of the body material 2b on the back side are fused to each other. There is. Further, in the lower portion (folded portion of the folding material 3) of the side sealing portions 5a and 5b, the back surface of the body material 2a on the front side and the back surface of the folding material 3 and the back surface and the back surface of the body material 2b on the back side are folded. The back surfaces of the material 3 are fused to each other.

Further, the left side seal portion 5a has a strip shape having a constant width (about 7 mm) except for a portion near the upper end (extraction port forming portion 11 described later). Further, the right side seal portion 5b has a band shape having a constant width (about 20 mm) wider than that of the left side seal portion 5a. An air filling portion 7 for confining air is vertically provided in the side seal portion 5b on the right side. As shown in FIGS. 1 (a) and 1 (b), the air filling portion 7 has the front and back body members 2a and 2b having the bulging portion B having a semi-cylindrical cross section formed on the outside (body) of the bulging portion B. By heat-sealing the materials 2a and 2b (outside along the sheet surface), a long hollow columnar shape is formed, and the upper end portion and the lower end portion are hemispherical.

On the other hand, at the lower end edge of the packaging bag P, a lower seal portion 6 is formed by heat-sealing the body materials 2a and 2b over the entire width, and the portions at the left and right ends thereof are the side seal portions 5a. , 5b overlaps with the lower end portion. The lower seal portion 6 has an arc shape whose upper end edge is convex downward, and the vertical width (height: about 5 mm) of the central portion is lower than the vertical width (height: about 50 mm) of the left and right. ing. In the lower seal portion 6, the back surface of the body material 2a on the front side and the back surface of the folding material 3 and the back surface of the body material 2b on the back side and the back surface of the folding material 3 are fused to each other.

Further, spot fusion portions 4 and 4 are provided at the lower end portions (gusset portions) of the side seal portions 5a and 5b, respectively. In the spot fusion portions 4 and 4, through holes (not shown) are provided so as to penetrate the folded material 3 folded in half, and through the through holes, the back surface of the body material 2a on the front side and the back surface thereof. The back surface of the body material 2b on the back side is directly fused to each other.

Further, in the upper left corner (corner portion) of the packaging bag P, an extraction port forming portion 11 for the user to cut by hand to form an extraction port is formed. That is, in the upper left corner of the packaging bag P, a substantially arcuate constriction 13 is provided near the upper end of the left side seal portion 5a, and the upper edge of the constriction 13 is below the constriction 13. It is located slightly inside the side edge. On the other hand, a band-shaped notch 12 having a width of about 10 mm and a height (height to the bottom) of 20 mm is provided at the upper left corner of the upper end edge of the packaging bag P. The base of the notch 12 is inclined upward to the left, and an acute-angled notch is formed at the left end of the bottom.

As described above, the constriction 13 and the notch 12 are formed, so that the knob 14 having a width of about 20 mm is formed. A perforation (a non-through hole formed by arranging them in a straight line) 15 is provided so as to connect the notch 12 and the constriction 13, and the perforation 15 is used as a boundary on the upper left side of the packaging bag P. The extraction port forming portion 11 is formed at the corner of the above.

<Manufacturing method of packaging bag>
Hereinafter, an example of manufacturing the above-mentioned packaging bag will be described. FIG. 2 is a flowchart showing a process of manufacturing a packaging bag, and FIG. 3 is an explanatory diagram showing a state of manufacturing a packaging bag. When manufacturing a packaging bag, the above-mentioned synthetic resin sheet (long one) is attached to the bag making machine. That is, a pair of synthetic resin sheets (body materials 2a and 2b) forming the front and back surfaces of the packaging bag are attached with the polyethylene film (heat-adhesive film) layers inside each other, and the pair of synthetic resins are attached. Between the lower edge of the sheet, the same synthetic resin sheet (folding material 3) for forming the bottom surface is placed in two valleys so that the polyethylene film (heat adhesive film) layer side is on the outside. Fold it and insert it (see FIG. 3A) (seat mounting step).

Then, by coating the outer surfaces of the front and back body materials 2a and 2b mounted on the bag making machine with the ultraviolet curable resin at predetermined intervals as described above, the shape of the bulging portion formed in the later step is deformed. A reinforcing layer (not shown) for prevention is formed (laminated) (reinforcing layer forming step). When forming the reinforcing layer, the reinforcing layer to be formed has an elliptical shape that is one size larger than the bulging portion formed in a later process (the width of the left and right and the top and bottom is an elliptical shape that is about 1 to 2 mm larger than the bulging portion). ), Etc. are adopted. The reinforcing layer can also be formed in advance on the synthetic resin sheet before it is attached to the bag making machine.

After that, a bulging portion B is formed on the body materials 2a and 2b after the reinforcing layer is formed by a vacuum forming method using a mold (bulging portion forming step). Immediately after the bulging portions B are formed on the body materials 2a and 2b in this way, the body materials 2a and 2b are overlapped so that the positions of the bulging portions B and B are aligned with each other. The air filling portion 7 is formed by heat-sealing the periphery of the bulging portions B and B (heat sealing step). FIG. 4 shows a mold used when forming the air filling portion 7 on the body materials 2a and 2b, and FIG. 5 shows an air filling portion 7 on the body materials 2a and 2b using the mold. It shows how to form.

The mold 21 used when forming the air filling portion 7 is composed of two pairs of mold members 21a and 21b. Each of the mold members 21a and 21b is formed in a vertically long rectangular parallelepiped shape, and a long (length = 130 mm) substantially semi-cylindrical recess 22 having a vertical constant width (width = about 10 mm) is formed. There is. Further, on the outside of the recess 22, three vent holes 23, 23 ... With a semi-cylindrical cross section are formed, and two columnar degassing holes 24, so as to connect the recess 22 and the outer surface. 24 are attached in the vertical direction. The degassing holes 24, 24 are located at an intermediate height between the adjacent ventilation holes 23, 23, respectively.

When forming the air filling portion 7, the above-mentioned molds 21a and 21b are heated to a predetermined temperature (90 to 120 ° C.). Then, as shown in FIG. 5A, the body materials 2a and 2b are pressed so as to follow the shape of the recesses 22 by sucking the air in the recesses 22 from the degassing holes 24 and 24, and the body members 2a and 2b are pressed. A bulging portion B having the same shape as the recess is formed by giving a heat history to the bulging portion (bulging portion forming step). Further, as shown in FIG. 5B, at almost the same time as the formation of the bulging portion B, the body members 2a and 2b are sandwiched between the heated molds 21a and 21b to prepare the periphery of the bulging portion B. (Lightly) heat-seal to form the spare seal portion 17 (see FIG. 3B) (preliminary heat-seal step). Since the mold members 21a and 21b are formed with ventilation holes 23, 23, ..., When suction is performed in the recess 22 by the degassing holes 24, 24, the ventilation holes 23, 23 ... Since air is smoothly sent between the bodies 2a and 21b, the body materials 2a and 2b can be sucked smoothly without wrinkles.

After the air filling portion 7 is formed in this way, as shown in FIG. 3C, the long body members 2a and 2b and the folding member 3 have a predetermined shape at a predetermined temperature (about 170 ± 5 ° C.). By continuously applying the heat seals at predetermined intervals, the side seal portions 5a and 5b and the lower seal portion 6 are formed (heat seal step). In such a heat-sealing step, the outer portion of the bulging portion B of the body materials 2a and 2b is heat-sealed, and the bulging portion B is not heat-sealed.

After that, as shown in FIG. 3D, the laminated body of the synthetic resin sheet on which the side seal portions 5a and 5b and the lower seal portion 6 are formed is placed between the side seal portions 5a and 5b (air filling portion 7). The packaging bags P, P ... Are obtained by cutting with a predetermined cutter at a predetermined interval (position separated from the above (about 5 mm)) (cutting step). According to the above-mentioned manufacturing method, it is possible to efficiently produce the packaging bags P, P ... With sufficient air entering the inside of the air filling portion 7 with a good yield.

<Action of packaging bag>
The packaging bag P configured as described above is used by filling the contents from the opening O (the portion from the right side of the notch 12 to the side sealing portion 5b of the right end edge) of the upper end edge that is not heat-sealed. Then, after filling the contents, the body members 2a and 2b of the opening O at the upper end edge are heat-sealed to form a band-shaped head seal portion having a constant height (about 5 mm to 10 mm). , The packaging bag P is sealed. The head seal portion is formed so as to overlap the left and right side seal portions 5a and 5b. When the contents are filled as described above, the packaging bag P is stable because the folded portion of the folding material 3 expands and the shape of the vertical cross section orthogonal to each body material on the front and back becomes substantially triangular. It can stand up in a state.

Then, when extracting the contents, the operator manually cuts and extracts the contents diagonally downward (in the direction of the perforation 15) starting from the notch at the lower part of the notch 12 of the extraction port forming portion 11. Form the mouth. Since the base film and the intermediate layer of the body materials 2a and 2b are both biaxially stretched films, they can be easily cut by hand. The packaging bag P having the extraction port formed in this way can extract the contents by inclining it at a relatively small angle. Even when the contents are extracted in this way, the packaging bag P can be kept in a stable state because its periphery is kept linear by the air filling portion 7.

<Effects of packaging bags and packaging bags>
In the above-mentioned packaging bag P, since the air filling portion 7 is formed by heat-sealing the two front and back body materials 2a and 2b forming the bulging portion B, air can be easily introduced in the production line. Since the inside of the filling portion 7 can be filled with air and the shape of the air filling portion 7 does not easily collapse, the air does not easily disappear from the inside of the air filling portion 7 for a long period of time. Good sex and ease of holding.

Further, since the above-mentioned manufacturing method of the packaging bag P includes an air filling portion forming step of forming the air filling portion 7 so as to bulge outward from other portions at the right end edge of the packaging bag P. The air-filled portion 7 filled with air can be formed in the packaging bag P without blowing air into the air-filled portion after bag making as in the conventional case. Therefore, according to the above-mentioned manufacturing method of the packaging bag P, it is possible to easily manufacture a packaging bag having good shape retention, self-supporting property, and easy holding for a long period of time.

Further, in the above-mentioned manufacturing method of the packaging bag P, the air filling portion forming step bulges outward from the other portions at one end edge of the two front and back body materials 2a and 2b, respectively. The bulging portion forming step for forming the bulging portion B and the two front and back body members 2a and 2b forming the bulging portion B are overlapped so that the positions of the bulging portions B and B match. Therefore, it has a heat-sealing step of heat-sealing the periphery of the bulging portions B and B. Therefore, according to the manufacturing method of the packaging bag P, the air filling portion 7 can be formed so as to clearly bulge with respect to other portions, so that air can be formed from inside the air filling portion 7 for a long period of time. It is possible to efficiently manufacture the packaging bag P, which is hard to disappear and has very good shape retention, independence, and ease of holding.

In addition, in the above-mentioned manufacturing method of the packaging bag P, the bulging portion forming step includes two pairs of mold members 21a, 21b provided with the recess 22 and the degassing holes 24, 24 ... Communicating with the recess 22. Using the vacuum forming method, the two front and back body materials 2a and 2b are heated in a state of being in close contact with the recesses 22 of the respective mold members 21a and 21b by suction from the degassing holes 24, 24 ... As a result, the bulging portion B is formed on the body members 2a and 2b. Therefore, according to this manufacturing method, the bulging portions B and B can be formed into a uniform shape in a short time, so that air does not easily disappear from the air filling portion 7 for a long period of time, and the shape is maintained. A packaging bag P having very good properties, independence, and ease of holding can be manufactured at low cost and with good yield.

<Example of changing the packaging bag and its manufacturing method>
The configuration of the packaging bag according to the present invention is not limited to the aspects of the above-described embodiments, and the material and size (height, width) of the synthetic resin sheet for forming the body material and the folded portion are not limited. , The folding width of the folding member, etc.), the shape of the side sealing portion, the lower sealing portion, and the like can be appropriately changed as necessary without departing from the spirit of the present invention.

For example, the synthetic resin sheet constituting the packaging bag is not limited to a laminate of a nylon film, a polyester film, and a polyethylene film (linear low-density polyethylene film) as in the above embodiment, and is not limited to other materials. A laminated resin film of the above may be used. When a synthetic resin sheet in which a nylon film, a polyester film, and a polyethylene film (linear low-density polyethylene film) are laminated is used, the strength of the packaging bag becomes good and the packaging bag becomes strong. It has the advantage of facilitating the manufacture of packaging bags. Further, the packaging bag according to the present invention is not limited to the one in which the vertically long linear air filling portion is formed as in the above embodiment, but the one in which the horizontally long air filling portion and the curved air filling portion are formed. Etc. may be used. In addition, the packaging bag according to the present invention is not limited to the pouch (standing pouch) as in the above embodiment, and can be changed to a three-sided bag, a gusset bag, or the like.

Further, the configuration of the packaging bag manufacturing method according to the present invention is not limited to the embodiment of the above embodiment, and the sheet mounting step, the air filling portion forming step (bulging portion forming step, heat sealing step), and the like. The contents of the cutting process and the like can be appropriately changed as necessary without departing from the spirit of the present invention. For example, the method for manufacturing a packaging bag according to the present invention is not limited to the method of performing preliminary heat sealing (heat sealing at a lower temperature than usual) substantially at the same time as forming the bulging portion as in the above embodiment, and swelling. A method in which preliminary heat sealing is not performed when forming the protruding portion may be used. When a method of performing preliminary heat sealing substantially at the same time as the formation of the bulging portion is adopted, there is an advantage that the positions of the bulging portions of the front and back body materials are unlikely to shift.

Further, the method for manufacturing a packaging bag according to the present invention is not limited to the method of sufficiently filling the air-filled portion with air substantially at the same time as the formation of the air-filled portion as in the above embodiment, and once sufficiently with air. It is also possible to change to a method of replenishing the air-filled portion with air after forming the unfilled air-filled portion. When the method of replenishing air after forming the air filling portion is adopted as described above, there is an advantage that the packaging bag before replenishing the air is not bulky.

In addition, the method for manufacturing a packaging bag according to the present invention is not limited to the method of forming a packaging bag provided with an air filling portion before filling the contents as in the above embodiment, and at the time of filling the contents. A method of forming an air filling portion may also be used. FIG. 6 shows an example of such a manufacturing method. In such a manufacturing method, as shown in FIG. 6A, a bag-shaped filling portion α for filling the contents and air filling are performed in advance. A bag-shaped body P _p is formed so as to be adjacent to a margin portion β for providing a portion (that is, a side having a constant width between the filled portion α of the bag-shaped body P _p and the margin portion β. A seal portion 5b'is formed). Then, at the time of filling the bag-shaped body _Pp with the contents, an air filling portion 7 is formed in the margin portion β as shown in FIG. 6B by using a filling machine or the like. That is, the bulging portion B is formed on the body members 2a and 2b, and the air filling portion 7 is formed by heat-sealing the periphery thereof. Even with such a manufacturing method, similarly to the manufacturing method of the above-described embodiment, the air-filled portion 7 filled with air is formed in the packaging bag P'without blowing air into the air-filled portion after bag making. Therefore, it is possible to easily manufacture a packaging bag P'with good shape retention, self-supporting property, and easy holding for a long period of time. Incidentally, as described above, even when an air-filled portion 7 during the filling of the contents, the barrel member 2a of the bag-like member P _p before filling the contents, formed in advance bulges B to 2b It is also possible.

Further, the method for manufacturing a packaging bag according to the present invention is not limited to the method of heat-sealing (excluding the bulging portion) around the bulging portion formed in the bulging portion forming step as in the above embodiment. , Heat-seal the air-filled part so that it is one size smaller than the bulged part (for example, the width of the air-filled part is about 1 to 2 mm smaller than the width of the bulged part). It is also possible to change to the method or the like. When such a method is adopted, there is an advantage that the pressure (internal pressure) of the air in the air filling portion can be increased.

In addition, the method for manufacturing a packaging bag according to the present invention uses a pair of mold members provided with recesses and degassing holes as in the above embodiment, and uses a vacuum forming method to suck suction from the degassing holes. By heating the two front and back synthetic resin sheets (body materials) in close contact with the recesses of each mold member, the recesses are not limited to those that form a bulging portion on each synthetic resin sheet. Using a pair of molds provided with a pair of molds, the two front and back synthetic resin sheets (body materials) are heated in close contact with the recesses of each mold by blowing air using the vacuum forming method. By doing so, it is possible to change to a sheet having a bulging portion formed on each synthetic resin sheet. Even when such a manufacturing method is adopted, since the bulging portion can be formed into a uniform shape in a short time as in the manufacturing method of the above embodiment, air disappears from the air filling portion for a long period of time. A packaging bag that is difficult and can maintain very good independence can be manufactured at low cost and with good yield.

Further, the packaging bag P according to the present invention is not limited to the one in which the upper end edge is not heat-sealed as the opening O as in the above embodiment, and the tip of the extraction port forming portion is not heat-sealed. It is also possible to change it to something like O.

In addition, the extraction port forming portion is not limited to the one provided with a relatively large notch and a straight perforation as in the above embodiment, but the one provided with a small notch or notch at the edge, and the corner is curved. It is also possible to change to one with perforations in the shape. Further, the extraction port forming portion is not limited to the one in which two flat body members are overlapped as in the above embodiment, and is orthogonal to the line segment to be cut for the purpose of enlarging the extraction port. , It is also possible to change to one provided with parallel folding lines (those that are convex outward) or one in which a cylindrical body made of synthetic resin is welded.

Further, the packaging bag according to the present invention is not limited to the one in which the extraction port forming portion is provided at the corner of the upper end edge as in the above embodiment, and the one-piece type or two-piece made of synthetic resin is provided at the center or corner of the upper end edge. A type of spout (extraction port) may be fixed (fused).

Since the packaging bag of the present invention exerts an excellent effect as described above, it can be suitably used as a packaging bag for various liquids and powders such as foods, chemicals, cosmetics and detergents. Further, the method for producing a packaging bag of the present invention can be widely used as a method for producing a packaging bag suitable for packaging bags of various liquids and powders at low cost and with good yield.

P ・ ・ Packaging bag 2a, 2b ・ ・ Body material 3 ・ ・ Folding material 5 ・ ・ Side seal part 6 ・ ・ Lower seal part 7 ・ ・ Air filling part B ・ ・ Swelling part 9 ・ ・ Opening 11 ・ ・Extract port forming part 21 ... Mold 21a, 21b ... Mold member 22 ... Recess 24 ... Degassing hole

Claims (2)

A packaging bag that is formed in a bag shape by heat-sealing the peripheral edges of two synthetic resin sheets on the front and back, and has an air-filled portion that is filled with air on the left, right, or upper and lower edges. It ’s a manufacturing method,
It has an air filling part forming step of forming an air filling part so as to bulge outward from other parts at the left and right or upper and lower peripheral edges of the packaging bag .
The air filling part forming process
A bulging portion forming step of forming a bulging portion so as to bulge outward from the other portions at the left and right or upper and lower peripheral edges of each of the two front and back synthetic resin sheets.
There is a heat-sealing process in which two synthetic resin sheets on the front and back sides forming the bulging portion are overlapped so that the positions of the bulging portions match, and the periphery of the bulging portion is heat-sealed. And
In the bulging portion forming step, the two front and back synthetic resin sheets are heated by using a recess and two pairs of dies provided with degassing holes communicating with the recess, and at the same time or before and after the heating. A bulging portion is formed on each synthetic resin sheet by being brought into close contact with the concave portion of each mold by suction from the degassing hole, and
The heat sealing process
A packaging bag characterized in that the internal pressure of the air-filled portion formed is increased by heat-sealing the bulging portion formed on each of the two front and back synthetic resin sheets so as to be one size smaller . Production method. A packaging bag that is formed in a bag shape by heat-sealing the peripheral edges of two synthetic resin sheets on the front and back, and has an air-filled portion that is filled with air on the left, right, or upper and lower edges. It ’s a manufacturing method,
It has an air filling part forming step of forming an air filling part so as to bulge outward from other parts at the left and right or upper and lower peripheral edges of the packaging bag .
The air filling part forming process
A bulging portion forming step of forming a bulging portion so as to bulge outward from the other portions at the left and right or upper and lower peripheral edges of each of the two front and back synthetic resin sheets.
There is a heat-sealing process in which two synthetic resin sheets on the front and back sides forming the bulging portion are overlapped so that the positions of the bulging portions match, and the periphery of the bulging portion is heat-sealed. And
In the bulging portion forming step, two pairs of molds provided with recesses are used to heat two synthetic resin sheets on the front and back surfaces, and at the same time or before and after the heating, air is blown into each mold. A bulging portion is formed on each synthetic resin sheet by being brought into close contact with the concave portion, and
The heat sealing process
A packaging bag characterized in that the internal pressure of the air-filled portion formed is increased by heat-sealing the bulging portion formed on each of the two front and back synthetic resin sheets so as to be one size smaller . Production method.

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