JP2913173B1 - Product packaging and production method thereof - Google Patents

Abstract

An object of the present invention is to provide a product package in which a plurality of product units in which a predetermined number of products are put together are packaged, and a production method thereof. [Structure] A plurality of packaging units are formed by loading a plurality of product units in a substantially cylindrical bag body including front and back film portions at intervals, and a front and back film portion is located between adjacent packaging portions. In a product package having a welded portion formed by mutually welding, the bag body constitutes a film overlapped portion by overlapping the free edges of the front and back film portions so as to be separated from each other, and the front and back of the welded portion are formed. The film part and the film superposed part are integrally welded, and the front and back film part and the film superposed part are brought into close contact with the product unit in the packaging part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a product package for packaging a small number of small items, particularly a small number of cylindrical small items such as dry batteries, as a product unit, and a method of producing the same.

[0002]

2. Description of the Related Art For example, dry battery products are sold over the counter in a state in which a predetermined number of product units are wrapped with a covering material such as a shrink film. In the case of dry batteries, one product unit generally includes an even number of batteries such as two or four dry batteries.

[0003] However, in the case of such a shrink wrap, if a user who purchases a product takes out one product by breaking the covering material and uses it, there is a possibility that other products may be scattered. No consideration has been given to storing the goods. For example, in the case of a product unit of a set of four dry batteries, if the covering material is broken and two dry batteries required for use are taken out, the remaining two dry batteries may be separated. Further, after the covering material is broken, it becomes impossible to determine whether the remaining dry battery is unused or used.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a product such as a dry battery, in which a plurality of product units in which a predetermined number of products are put together are placed in a substantially cylindrical bag made of front and back film portions. A plurality of packaging parts are formed by loading them at intervals in the direction, and a packaging part and a welding part are formed by forming a welding part which is located between adjacent commodity units and in which the front and back film parts are welded to each other. Are provided alternately.

Therefore, for example, when the number of commodities constituting a merchandise unit is two, one package packs a number of commodities corresponding to an integral multiple of two commodities in accordance with the number of units of the merchandise unit. Thus, a product package in which a desired number of products are packaged together can be sold over the counter.

[0006] When the user who has purchased the product package consumes the product, it is sufficient to open the packaging unit for each product unit and take out the number of products corresponding to one unit. Is in an unopened packaged state by the packaging unit, and thus can be stored as a product package.

However, in order to provide such a product package, it is necessary to further improve the appearance so that the product unit can be suitably loaded into the bag and the appearance after loading is improved. is there.

In particular, when a bulky product unit is loaded into a bag, it is important to easily load the product unit. However, if the product unit is to be easily received in consideration of the ease of loading. If the size of the body is made large, there arises a problem that the appearance appearance is deteriorated, for example, when the welded portion is formed between the adjacent product units after loading and a welded portion is formed.

[0009]

SUMMARY OF THE INVENTION The present invention provides a product package which solves the above-mentioned problems and a method for producing the same.

Therefore, the product packaging bag according to the present invention is constituted as a first means in that a plurality of units of a product unit in which a predetermined number of products are put together are packaged in a substantially cylindrical bag having front and back film portions. A plurality of wrapping portions are formed by loading the wrapping portions at intervals in the cylinder axis direction, and a wrapping portion is formed between adjacent product units by forming a welded portion where front and back film portions are welded to each other. And a welded portion, in a product package, the bag body is configured to overlap the free edges of the front and back film portions extending in the cylinder axis direction so that they can be separated from each other, and a film overlap portion, The film overlapping portion is disposed on one side of the front and back surfaces of the product unit, the front and back film portion and the film overlapping portion are integrally welded at the welding portion, and the front and back film at the packaging portion. And some of the film overlapping portion to a point comprising brought into close contact to the goods unit.

Further, the product packaging bag of the present invention is constituted as a second means, in the product packaging bag constituted by the first means, a front and back film formed by folding a single film. The first gusset portion is formed on one side of the bag by bending the folded portion of the portion inside the bag into a substantially V-shaped cross section, and the extension of the back film portion extended in the folding direction is formed. A second gusset portion is formed on the other side of the bag by bending the bag into a substantially V-shaped cross-section inside the bag, and the free edge portion of the back film portion further extended from the second gusset portion and the front edge are formed. A film overlapping portion is formed by overlapping the free edge portions of the film portion so as to be separated from each other, and the front and back film portions, the first gusset portion and the second gusset portion bent inward at the welded portion. , Film polymerization Preparative integrally welded to lies in comprising closely brought into product units the front and back film portions and the film overlapping portion with allowed to extend the first gusset portion and the second gusset portion in the packaging unit.

[0012] Further, the method for producing a product packaging bag of the present invention is configured as a means, wherein a plurality of product units in which a predetermined number of products are put together are packaged in a substantially cylindrical bag having front and back film portions. A plurality of wrapping portions are formed by loading the wrapping portions at intervals in the cylinder axis direction, and a wrapping portion is formed between adjacent product units by forming a welded portion where front and back film portions are welded to each other. And a welded portion are formed alternately in a method for producing a product package, which comprises a body bag forming step, a product unit loading step, and a welding step, and the bag body forming step is substantially a cylinder formed of front and back film portions. When forming a bag-like shape, the folded portion of the front and back film portions formed by folding one sheet of film is bent inside the bag body into a substantially V-shaped cross section to form one side portion of the bag body. First gusset part The second gusset portion is formed on the other side of the bag by forming and bending the extension of the back film portion extended in the folding direction into a substantially V-shaped cross section inside the bag. A film overlapping portion is formed by overlapping a free edge portion of the back film portion further extended from the two gusset portions and a free edge portion of the front film portion so as to be separated from each other, and one end in the cylinder axial direction of the bag body. The front and back film portion, the first gusset portion and the second gusset portion bent inward, and the film overlap portion is integrally welded to form a closed portion, and the other end in the axial direction of the bag body In the part, the opening part is formed by opening the front and back film part, the first gusset part and the second gusset part, and the film overlapping part, and the merchandise unit loading step includes the first gusset part and / or the second gusset part. Extension The opening of the bag is expanded by separating the film overlapping portions from each other and the product unit is loaded into the bag from the opening, and the first gusset portion and the second gusset portion are extended. Forming a packaging part for packaging the unit, the welding step, in a portion adjacent to the packaging part, the front and back film portion, the first gusset portion and the second gusset portion bent inward, and a film polymerization portion, Are welded together to form a welded portion, and the product unit loading step and the welding step are repeated to alternately form the packaging portion and the welded portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

[Basic Embodiment] As shown in FIG. 1, a merchandise package 1 is composed of a merchandise unit 6 in which a predetermined number of merchandises 5 are collected in a substantially cylindrical bag body 4 composed of front and back film portions 2 and 3.
Are packed at intervals in the cylinder axis direction of the bag body 4 to form a plurality of packaging portions 7 and between adjacent product units 6, 6 (ie, between the packaging portions 7, 7). By forming a welded portion 8 in which the front and back film portions 2 and 3 are welded to each other, the packaging portion 7 and the welded portion 8 are formed alternately.

The front and back film portions 2 and 3 of the bag 4 are formed by folding a band-shaped synthetic resin film as described later, and it is preferable to use a transparent or translucent film so that the product 5 can be seen through. However, it may be opaque. In order to suspend and display the product package 1 at the store, it is preferable to provide a header 9 at the top of the bag 4, and the header 9 is made of a thick synthetic resin integrated with the front and back film portions 2 and 3. A core material sheet 10 such as a sheet or a synthetic paper; a suspension means 1 such as a suspension hole or a hook in the header portion 9;
1 is provided.

In the illustrated embodiment, the product 5 is a tubular product such as a dry battery. In the illustrated example, two dry batteries 5 are combined to form one product unit 6, and this product unit 6 Is provided in a plurality of rows,
A product package 1 in which a number of dry batteries 5 corresponding to an integral multiple of the number of products are packaged is provided, but the number of products 5 constituting the product unit 6 can be set arbitrarily (including one).

When the user who has purchased the product package 1 consumes the product 5, the packaging unit 7 is opened for each product unit 6, and the number of products (two in the illustrated example) corresponding to one unit is opened. It is only necessary to take out the dry battery). At that time, the other product units 6 are kept unopened by the packaging unit 7 and can be stored in a package state.

In the case of the illustrated embodiment, the welding portion 8 is provided with a separating means 12 comprising a perforation, so that the packaging portion 7 of the product unit 6 can be easily separated from the adjacent packaging portion 7. ing. Therefore, if the user
When consuming, the necessary packaging part 7 is sequentially separated from the product package 1 from one end, and the separated packaging part 7a
The product 5 may be taken out by opening the box. Or,
At the time of over-the-counter sales, by separating the packaging unit 7 from the displayed product packaging 1, it is also possible to perform bulk sales in units of product units 6.

The separating means 12 may be formed by a perforation as shown in the figure or by a groove, or may be formed by a notch formed by cutting the welded portion 8 from one side edge of the bag body 4. It is possible, but without providing such a separating means 12,
Separately, the welded portion 8 may be cut and separated by scissors or a cutter. Then, when the user opens the packaging section 7 to take out the product 5, as described later, the packaging section 7 of the front and back film sections 2 and 3 can be easily opened by peeling off the film overlapping sections 16 from each other.

FIG. 2 shows the configuration of the bag 4 and a method of forming the product package 1 by loading the product unit 6 into the bag 4.

The bag body 4 is formed by folding a single synthetic resin film into the front and back film portions 2 and 3 and bending the folded portion into a substantially V-shaped cross section inside the bag body 4. A first gusset part 14 is formed on one side of the bag body, and an extension of the back film part 3 extended in the folding direction is bent inside the bag body 4 into a substantially V-shaped cross section, thereby forming another bag body. A second gusset portion 15 is formed on the side portion, and the free edge 3a of the back film portion 3 and the free edge 2a of the front film portion 2 further extended from the second gusset portion 15 can be separated from each other. The film overlap section 16 is formed by overlapping.

In the case of the configuration in which the header portion 9 is provided as in the illustrated embodiment, the first gusset portion 14 and the second gusset portion 15 are folded inward at one end in the cylinder axis direction of the bag body 4. The front and back film portions 2 and 3 including the film overlapping portion 16 are overlapped and integrally welded to the core sheet 10 constituting the header portion 9, thereby forming the closed portion 17 of the bag body 4. On the other hand, at the other end in the cylinder axis direction of the bag body 4, the opening 18 is opened by opening the front and back film parts 2 and 3, the first gusset part 14 and the second gusset part 15, and the film overlapping part 16. Has formed.

As shown by the chain line in FIG. 2, in the opening 18, the first gusset 14 and the second gusset 15 are extendable, and the film overlapping section 16 is freely separated from each other. Therefore, the opening 18 can be expanded. For example, the opening 18 is expanded by a worker pushing the opening 18 by hand or by inserting a conical chute or the like into the opening 18.

Therefore, the product 5 can be easily inserted from the expanded opening 18. For example, as shown in FIG. 2, when the product 5 is inserted from the opening 18 located at the upper part in a state where the bag 4 is held with the header 9 facing downward, the product 5 It falls suitably and reaches the closing part 17. When the loading of the product unit 6 is completed by inserting a predetermined number of products 5, the first gusset part 14 and the second gusset part 15 extend on both sides of the product unit 6, and the packaging unit for enclosing the product unit 6 7 is obtained. In addition to the drop loading method using the weight of the product under its own weight, the product may be pushed in by a cylinder means or the like while the bag body 4 is held horizontally.

After that, the welding portion 8 is formed by sandwiching the front and back film portions 2 and 3 with a hot plate or the like at a position adjacent to the packaging portion 7, and FIG. 2 and FIG.
As shown in (B), the packaging part 7 is tensed toward the product unit 6. That is, the packaging unit 7 holds the front and back film units 2 and 3 including the film superimposing unit 16 in close contact with the surface of the product unit 6. Therefore, the product unit 6 does not rattle.

When the front and back film portions 2 and 3 are sandwiched by a hot plate or the like in forming the welded portion 8, the front and back film portions 2 and 3 are formed.
Since the first gusset portion 14 and the second gusset portion 15 are folded inward as they are pressed against each other, FIG.
As shown in (C), the front and back film parts 2 and 3 including the film overlapping part 16 are integrally welded to each other with the first gusset part 14 and the second gusset part 15 bent inward. .

The above-described separating means 12 such as perforations may be provided in the welded portion 8 simultaneously with or after the welding.

Subsequently, the same operation as described above is repeated.
That is, when the product unit 6 is further inserted from the expanded opening portion 18, the product unit 6 reaches the welded portion 8 formed earlier and forms the next packaging portion 7 there. Similarly, the next welded portion 8 may be formed. And
By repeating such operations, the packaging portions 7 and the welding portions 8 are alternately formed on the bag body 4, and after the predetermined number of product units 6 have been loaded, the opening portion 1 of the bag body 4 is opened by the last welding portion 8.
8, the product package 1 as shown in FIG. 1 is obtained.

[Another Embodiment of Product Package] FIG. 4 shows another embodiment of the product package 1, in which a predetermined number (two in the example shown) of products 5 such as dry batteries are juxtaposed. Thus, the product unit 6 is configured. Other configurations are the same as those of the above-described basic embodiment.

[First Embodiment of Bag] FIG. 5 shows a first embodiment of the bag 4 constituting the product package 1, and sequentially shows a bag forming process.

As shown in FIG. 5 (A), when the front and back film portions 2 and 3 are formed by folding back the belt-shaped synthetic resin film fed out of the roll and continuously transported, the folded portion is substantially inward in cross section. The first gusset portion 14 on one side is formed by bending into a V shape, and the extended portion of the back film portion 3 extended in the folding direction is bent inward into a substantially V-shaped cross section to thereby form another portion. Side second gusset part 15
Is formed, and the free edge 3a of the back film portion 3 extended from the second gusset portion 15 and the free edge 2a of the front film portion 2 are overlapped with each other so as to be separated from each other. Is formed. At this time, it is preferable that the bent portions formed at the respective three places of the first gusset portion 14 and the second gusset portion 15 form a fold in the film to impart a bending habit. In the case of the illustrated example, the film overlapping portion 16 has the free edge portion 2a of the front film portion 2 arranged outside and the free edge portion 3a of the back film portion 3 arranged inside, but vice versa. May be arranged. In this way, a substantially cylindrical film cylindrical body 4a having the first gusset part 14 and the second gusset part 15 is formed, and is transported in the cylinder axis direction.

The film cylindrical member 4a is switched from continuous transfer to intermittent transfer. As shown in FIG. 5B, at the time of intermittent stop, the tape-shaped core material sheet 10 is moved from a direction perpendicular to the transfer direction. The closing portion 17 is formed by feeding and stacking the core material sheet 10 on both sides thereof integrally with the film while overlapping the film cylindrical member 4a on the film cylindrical member 4a. At this time, if necessary, the suspension means 11 such as suspension holes are punched and formed. After that, the header portion 9 is formed by dividing the core material sheet 10 along the side edge of the film cylindrical body 4a.

Subsequently, the continuous film cylinder 4a is
The film tubular body 4a is blown in the width direction along the fusing line W located at the front edge of the header portion 9, and further, the film tubular body 4a is blown along the cutting line C located in front of the fusing line. Direction, and as shown in FIG. 5C,
The bag body 4 having the header portion 9 having the closing portion 17 at one end and the opening 18 at the other end is obtained. Note that only the cutting along the cutting line C may be performed without performing the fusing along the fusing line W.

[Second Embodiment of Bag] FIG. 6 shows a second embodiment of the bag 4 constituting the product package 1, and sequentially shows the bag forming process.

As shown in FIG. 6 (A), when the front and back film portions 2 and 3 are constructed by folding the belt-shaped synthetic resin film fed out of the roll and continuously transported, the first gusset is provided on one side. A second gusset part 15 on the other side, and a second gusset part 15
The free film edge portion 3a of the back film portion 3 and the free film edge portion 2a of the front film portion 2 are extended from each other so as to be separated from each other. The cylindrical body 4a is formed. This point is the same as that of the first embodiment, but in this embodiment, the strip-shaped core material sheet 10 continuous along the inside of the back film portion 3 is superposed.

The film cylindrical member 4a is switched from continuous transfer to intermittent transfer, and when intermittently stopped, the front and back film portions 2, 3 are sandwiched between the core material sheets 10 as shown in FIG. By integrally welding 17b, 17b, the header portion 9 is formed, and one of the welding portions 17b is formed.
The above-mentioned closing part 17 is formed by b. At this time, suspension means 11 such as suspension holes are punched and formed in the header portion 9 if necessary.

Thereafter, the continuous film cylinder 4a is
The film tubular body 4a is blown in the width direction along the fusing line W located at the front edge of the header portion 9, and further, the film tubular body 4a is blown along the cutting line C located in front of the fusing line. Direction, and as shown in FIG. 6C,
The bag body 4 having the header portion 9 having the closing portion 17 at one end and the opening 18 at the other end is obtained. Note that only the cutting along the cutting line C may be performed without performing the fusing along the fusing line W.

[Third Embodiment of Bag] FIG. 7 shows a third embodiment of the bag 4 constituting the product package 1, and shows the bag forming process in order. As in the third embodiment, the film cylindrical body 4a in which the first gusset part 14, the second gusset part 15, and the film superposed part 16 are formed by folding the belt-shaped synthetic resin film is shown in FIG. As shown, a continuous band-shaped core material sheet 10 is polymerized along the inside of the front film portion 2 and the core material sheet 1 is formed.
0 of the film overlapping portion 16
attend to. Subsequent steps are the same as in the second embodiment. After the steps shown in FIG. 7B, a bag 4 as shown in FIG. 7C is obtained.

[0039]

According to the present invention, a product package 1 comprises a plurality of product units 6 each having a predetermined number of products 5 packed in a substantially cylindrical bag 4 comprising front and back film portions 2 and 3. A plurality of packaging portions 7 are formed by loading the body 4 at intervals in the cylinder axis direction, and adjacent product units 6,
6, the front and back film portions 2, 3 are welded to each other to form a welded portion 8, so that the packaging portion 7 and the welded portion 8 are welded.
Are alternately provided, so that a plurality of product units 6
Can be provided as a single product package.

Therefore, when the user who has purchased the product package 1 consumes the product 5, the packaging unit 7 may be opened for each product unit 6, and the number of products corresponding to one unit may be taken out. The other product units 6 can be stored in the unopened package state by the packaging unit 7.

In particular, according to the present invention, the substantially cylindrical bag 4
However, at one end portion, a closed portion 17 is formed, but at the portion from the closed portion 17 to the opening portion 18, the free edge portions 2a, 3a of the front and back film portions 2, 3 are overlapped so as to be able to be separated from each other. When the merchandise unit 6 is loaded in the bag body 4,
The opening 18 can be expanded, and the loading operation can be easily performed.

On the other hand, after the merchandise unit 6 is loaded, a welding portion 8 is formed between the packaging portions 7, 7 so that the packaging portion 7 has the front and back film portions 2, 3 including the film overlapping portion 16.
Is closely contacted with the product unit 6 and is suitably held, so that the appearance of the package can be kept good.
Since the packaging unit 7 holding the product unit 6 allows the free edges 2a, 3a of the film overlapping unit 16 to be separated from each other, when the user opens the packaging unit 7 to take out the product 5, By inserting a fingertip or the like between the free edge portions 2a, 3a in the film overlapping portion 16, the one free edge portion 2a or 3a can be opened while tearing or peeling off. There is convenience.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a basic embodiment of a product package of the present invention.

FIG. 2 is a perspective view showing a state in which a bag is loaded with a product and a packaging portion and a welded portion are being formed in order to produce a product package according to the basic embodiment of the present invention.

3A and 3B are partial cross-sectional views of a product package according to a basic embodiment of the present invention, in which FIG. 3A is a vertical cross-sectional view showing a package portion adjacent to a welded portion, and FIG. (C) is a cross-sectional view showing a welded portion.

FIG. 4 is a perspective view showing another embodiment of the product package of the present invention.

FIG. 5 shows a step of forming a bag according to the first embodiment of the bags used for the product package of the present invention;
(A) is a perspective view showing a process of forming a film cylindrical body,
(B) is a perspective view showing a step of forming a header portion and the like, (C)
FIG. 3 is a perspective view showing a formed bag.

FIG. 6 shows a step of forming a bag according to a second embodiment of the bags used for the product package of the present invention,
(A) is a perspective view showing a process of forming a film cylindrical body,
(B) is a perspective view showing a step of forming a header portion and the like, (C)
FIG. 3 is a perspective view showing a formed bag.

FIG. 7 shows a step of forming a bag according to a third embodiment of the bags used for the product package of the present invention;
(A) is a perspective view showing a process of forming a film cylindrical body,
(B) is a perspective view showing a step of forming a header portion and the like, (C)
FIG. 3 is a perspective view showing a formed bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Merchandise package 2 Front film part 3 Back film part 2a, 3a Free edge 4 Bag 5 Merchandise 6 Merchandise unit 7 Packaging part 8 Welding part 9 Header part 12 Separation means 14 First gusset part 15 Second gusset part 16 Film overlapping part 17 Closure part 18 Opening part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 30 / 10,75 / 12 B65B 9/02 B31B 31/64 H01M 2/10

Claims (3)

(57) [Claims] A plurality of packaging units are loaded into a substantially cylindrical bag comprising front and back film portions, with a plurality of units of product units in which a predetermined number of products are put together at intervals in the cylinder axis direction of the bag. Forming a welded portion between the adjacent product units and welding the front and back film portions to each other, thereby forming a packaged portion and a welded portion alternately. The film overlapping portion is formed by overlapping the free edges of the front and back film portions extending in the cylinder axis direction so that the body can be separated from each other, and the film overlapping portion is arranged on one surface of the front and back surfaces of the product unit. It is characterized in that the front and back film portion and the film overlapping portion are integrally welded at the welding portion, and the front and back film portion and the film overlapping portion are brought into close contact with the product unit in the packaging portion. Product packaging body to. 2. A first gusset portion is formed on one side of the bag by bending a folded portion of the front and back film portions formed by folding one sheet of film into a substantially V-shaped cross section inside the bag. And forming a second gusset portion on the other side of the bag by bending an extension of the back film portion extended in the folding direction into a substantially V-shaped section inside the bag. The free edge of the back film portion further extended from the second gusset portion and the free edge of the front film portion are overlapped so that they can be separated from each other to form a film overlapped portion, and the front and back films are formed at the welded portion. Part, the first gusset part and the second gusset part bent inward, and the film superposed part are integrally welded, and the first gusset part and the second gusset part are elongated in the packaging part, and the front and back films are formed. Department and Product packaging according to claim 1, characterized by comprising closely brought the Irumu polymerization unit to product unit. 3. A plurality of packaging units by loading a plurality of product units, each of which includes a predetermined number of products, into a substantially cylindrical bag comprising front and back film portions at intervals in the cylinder axis direction of the bag. And by forming a welded portion located between adjacent product units and having the front and back film portions welded to each other, so that a method for producing a product package body in which a packaging portion and a welded portion are alternately configured. , A body bag forming step, a product unit loading step, and a welding step. In the bag forming step, a single film is folded when forming a substantially cylindrical bag body comprising front and back film portions. The first gusset portion is formed on one side of the bag body by bending the folded portion of the front and back film portion formed into a substantially V-shaped section inside the bag body, and the back surface extended in the folding direction. Extension of film part A second gusset portion is formed on the other side of the bag by bending the bag into a substantially V-shaped cross-section inside the bag, and the free edge portion of the back film portion further extended from the second gusset portion and the front edge are formed. The film overlapping portion is configured by overlapping the free edge portions of the film portion so as to be able to separate from each other, the front and back film portions at one end in the cylinder axis direction of the bag body, the first gusset portion bent inward, and A second gusset part, a closed part is formed by integrally welding the film superposed part, and the front and back film parts, the first gusset part and the second gusset part at the other axial end of the bag body, An opening is formed by opening the film overlapping section, and in the product unit loading step, the bag is formed by extending the first gusset section and / or the second gusset section and separating the film overlapping section from each other. The opening of the product unit is expanded from the opening, the product unit is loaded into the bag from the opening, and the packaging unit for packaging the product unit in a state where the first gusset portion and the second gusset portion are extended is formed. At a site adjacent to the packaging section,
A front and back film portion, a first gusset portion and a second gusset portion bent inward, and a film overlapping portion are integrally welded to form a welding portion, and the merchandise unit loading step and the welding step are repeated. A method for producing a product package, wherein the packaging portion and the welded portion are alternately formed.