CN114286792A

CN114286792A - Expansion sheet, package, and packaging method

Info

Publication number: CN114286792A
Application number: CN201980099844.7A
Authority: CN
Inventors: 小柳美史
Original assignee: Kashiwara Seitai Co Ltd
Current assignee: Kashiwara Seitai Co Ltd
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2022-04-05
Also published as: US20220396409A1; WO2021074983A1; JPWO2021074983A1; JP6709927B1

Abstract

To provide an expansion sheet body, an expansion package body and a packaging method which are high in mass productivity and versatility. A plurality of cells (22) defined by cell seals (41) that join the superposed films are arranged adjacent to each other, and the cells (22) are inflated by introducing a fluid into the cells (22) from the upstream side. At least one cell (22) is provided with a non-expansion region (36) in a midstream section from the upstream side to the downstream side. The cell seal (41) in a region downstream of the non-expansion region (36) is provided with a communication portion that allows a fluid to flow between the adjacent cell seal (41). The non-expanded region (36) is used as a placement section (26) for the overlapping section (27) and the planar sheet (25).

Description

Expansion sheet, package, and packaging method

Technical Field

The present invention relates to an expansion sheet body in which a plurality of cells can be expanded by a fluid such as air, a package in which an object to be packaged is packaged by the expansion sheet body, and a packaging method thereof.

Background

As shown in patent documents 1 to 3, an inflation sheet body is used in the technical field of a package, particularly as a cushion body, or as a package having a cushion function of its own, and is configured such that a plurality of cells defined by cell seals joining overlapping films are arranged adjacent to each other, and the cells are inflated by introducing a fluid into the cells from the upstream side. The solutions of patent documents 1 to 3 are implemented as a structure that exerts a cushioning function of protecting an object to be packed by introducing air into the interior of a cell, but a liquid or gaseous object to be packed may be introduced into the interior of a cell, and the cell may be implemented as a structure constituting a package or as a decorative article.

As the field of use and the mode of use of the inflatable sheet body expand, the mode of the entire structure of the inflatable sheet body also varies, and as shown in patent documents 2 and 3, attempts have been made to form a three-dimensional shape from a relatively simple shape such as a simple sheet-like shape or a bag-like shape.

When the expansion sheet body has a three-dimensional shape, the cells may be overlapped with each other by bending the cells at the bending seal portion. There are also the following cases: in such an overlapping portion, it is advantageous to provide a non-expanded region that holds the planar sheet without expanding one of the cells that are overlapped, but to provide the other cell with no expanding region.

Further, when a flat sheet such as a receipt is to be attached to an expandable sheet body, or when characters or the like are to be directly written with an oil-based ink, it may be convenient to form a non-expandable region.

In order to form such a non-expanded region in a state of holding a flat sheet, the cells may be sealed at the upstream and downstream sides without introducing a fluid into a predetermined region of the cells. However, there are also cases where: it may be advantageous to direct air into a region further downstream than the non-expanded region to expand the cell.

As described above, the units can be implemented in various ways, and a logistics system that can cope with the daily change and the production of many kinds of small-lot products is required at an early stage, and in this case, the necessity of cost reduction such as the common use of a mold is increasing.

In other words, in the field of the sheet for expansion, development of a technique excellent in mass productivity is also desired. In addition, it is desired to develop a technique having excellent correspondence to small species.

Prior art documents

Patent document

Patent document 1: japanese patent No. 4051226

Patent document 2: japanese examined patent publication (Kokoku) No. 7-5123

Patent document 3: japanese Kokai publication Hei-5-16671

Disclosure of Invention

Problems to be solved by the invention

The invention provides an expansion sheet body with high batch production and universality.

The present invention addresses the problem of providing a disposable sheet for inflation that can provide a sheet for inflation that is highly versatile and highly mass-producible.

The invention provides an expansion sheet body capable of obtaining packaging bodies of various shapes by local change and provides an expansion disposable sheet body for obtaining the expansion sheet body.

The invention provides a packaging body and a packaging method with excellent batch production and small variety correspondence.

Means for solving the problems

The present invention improves an inflation sheet body configured such that a plurality of cells defined by cell seals joining overlapping films are arranged adjacent to each other, and the cells are inflated by introducing a fluid into the cells from an upstream side.

In the sheet for inflation of the present invention, at least one of the cells includes a non-inflatable region in which the cell is not inflated in a midstream section from an upstream side to a downstream side. The cell having the non-expanded region includes a communication portion that allows the fluid to flow between the adjacent cells, in the cell seal on the downstream side of the non-expanded region. Further, a region of the cell on a downstream side of the non-expansion region is expanded by the fluid from the communication portion.

In the inflatable sheet body of the present invention, even when the non-inflatable region in which the cells are not inflated is provided in the midstream section from the upstream side to the downstream side, the communicating portion is provided in the cell seal on the downstream side, and therefore, the fluid can be introduced from the adjacent cells, and the region on the downstream side of the cells can be inflated.

In the practice of the present invention, the non-expanded region can be used for various purposes. For example, the front side of the non-expanded region can be used as a placement portion for a flat sheet such as a document or a document storage portion. In addition, when the sheet for inflation is formed into a three-dimensional shape, the cells may be overlapped with each other, but at least one of the cells in the overlapped portion may be formed into the non-inflated region, whereby an excessively large shape can be formed, and a more complicated three-dimensional shape can be provided.

In this case, by providing a folding seal portion in at least one of the cells, the cells can be easily folded from the folding seal portion.

The present invention also provides a package in which the object to be packaged is packaged by using the sheet for expansion. In the package of the present invention, the non-expanded region of the cell is not expanded, and a region on the downstream side of the non-expanded region is expanded.

In the production of the sheet for expansion of the present invention, a primary sheet to which a basic seal is applied is produced, and secondary processing or tertiary processing corresponding to each product is applied thereto, whereby sheet for expansion of various forms can be produced from a common primary sheet.

That is, the present invention provides an inflatable primary sheet body configured such that a plurality of cells defined by cell seals joining overlapping films to each other are arranged adjacent to each other, and the cells are inflated by introducing a fluid into the cells from an upstream side, wherein the inflatable primary sheet body is provided with the following means. At least one of the cells includes a non-expansion scheduled region in which the cell does not expand in a midstream section from the upstream side to the downstream side. The plurality of cells including the cell having the non-expansion scheduled region include a communicating portion that allows the fluid to flow between the adjacent cells at a position downstream of the non-expansion scheduled region. In the inflatable primary sheet body, the communication portion downstream of the non-inflatable region is not sealed by the sealing member, and the communication portions other than the communication portion are sealed by the sealing member, whereby an inflatable sheet body inflated in a region downstream of the non-inflatable region can be obtained.

In addition, the present invention provides a packaging method using an expansion sheet, in which after the expansion-preventing seal and the closing seal are applied to the primary sheet for expansion to produce a secondary sheet for expansion, the packaged object is packaged by the secondary sheet for expansion, and air is introduced as the fluid from the upstream side of the cell into the cell, thereby producing a packaged object expanded in a region downstream of the non-expansion region.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide an expansion sheet having high mass productivity and versatility.

The present invention can provide a disposable sheet for inflation that can obtain a sheet for inflation that is high in mass productivity and versatility, and thus can improve the mass productivity and versatility of the sheet for inflation.

The present invention can provide an expansion sheet body which can obtain packages of various shapes by local modification. Further, a primary sheet for inflation for obtaining such a sheet for inflation can be provided.

The present invention can provide a package and a packaging method which are excellent in mass productivity and small article correspondence.

Drawings

Fig. 1(a) is a perspective view of an expansion package using an expansion sheet member showing an embodiment of the present invention, and fig. 1(B) is a cross-sectional explanatory view taken along line B-B of fig. 1 (a).

Fig. 2 is a plan view showing an expandable sheet body of the expandable sheet body according to the embodiment of the present invention.

Fig. 3 is a plan view showing an expandable secondary sheet body of the expandable sheet body according to the embodiment of the present invention.

Fig. 4 is a perspective view of an inflated packing material using an inflation sheet member showing another embodiment of the present invention.

Fig. 5 is a plan view showing an expandable primary sheet body of an expandable sheet body according to another embodiment of the present invention.

Fig. 6 is a perspective view of an inflated packing material using an inflation sheet member showing still another embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

(summary)

The sheet for expansion of the present embodiment is a sheet in which a plurality of cells 22 are arranged adjacent to each other. The cells 22 are defined by cell seals 41 that join the 2 superposed films 21 to each other, and each cell 22 is inflated by introducing a fluid (air in this embodiment, but other gas or liquid may be used) into each cell 22 from the upstream side (the upper end in fig. 2 and 3) toward the downstream side (the lower end in fig. 2 and 3).

Fig. 1 shows an expanded package 13 in which the object 14 is wrapped with an expanding sheet expanded by each cell 22.

In the present invention, the sheet for expansion is understood to be any of the following forms: the primary sheet 11 for expansion or the secondary sheet 12 for expansion in a state before the packaged article 14 is packaged; a sheet after the packaged object 14 is packaged and before air is introduced; the inflated package 13 is packed with the packed material 14 and then air is introduced.

In the inflated package 13 of this embodiment, even in a state where air is introduced into the cells 22, a non-inflated region 36 that does not inflate by introducing air is formed in a partial region of a predetermined cell 22. In the case where air is introduced into each cell 22 from upstream to downstream, if only the cell 22 is viewed, the air is not introduced into the downstream region 37 of the non-expansion region 36 in the downstream region 37, and therefore cannot be expanded. Another feature of the present invention is that mass productivity and small product type compatibility of the expansion sheet in which the non-expansion region 36 is provided in the midstream region of the cell 22 are improved, and in the present embodiment, mass productivity and small product type compatibility are achieved by the primary expansion sheet body 11 and the secondary expansion sheet body 12.

(Explanation of the entirety of the primary sheet for inflation 11)

Referring to fig. 2 and 1, the primary sheet for inflation 11 will be described.

In the case of industrially producing the sheet for expansion, it is advantageous to carry out the production by sealing necessary portions by a process such as heat sealing while continuously conveying two films 21 in a superimposed state. Therefore, the film 21 is fed out from the long body wound in a roll, and a plurality of expansion sheets are continuously produced in the conveying direction indicated by the arrow F, and cut at an appropriate stage until the object to be packaged 14 is packaged.

As the film 21, a single sheet or a composite laminated sheet of a synthetic resin having a sealing property against a fluid such as air can be used.

(integral structure of cell 22)

In the primary sheet for expansion 11, a plurality of cells 22 are arranged along the conveying direction 20, and each cell 22 is continuously formed from upstream (upper end in fig. 2) toward downstream (lower end in fig. 2) in a direction intersecting the conveying direction 20.

Each cell 22 is formed by joining two films 21 (see fig. 1B) to each other with a seal, and in this embodiment, the cell 22 is formed in a rectangular shape in which the upstream end and the downstream end of the cell 22 are defined by an upstream seal 44 and a bottom seal 45, and the left and right sides are defined by cell seals 41.

By forming the cell seal 41, the diameter of the cells 22 expanded can be limited to a predetermined size, and the entire sheet for expansion can be formed into a sheet-like body suitable for packaging the object to be packaged 14. In addition, in the case where the cells 22 are not connected to each other and are independent from each other, even if one cell 22 is broken and collapsed, the other cell 22 can be kept in the expanded state, and the cushioning function can be suppressed from being impaired at one time.

(region of cell 22)

The common channel 24, the first region 31, the second region 32, the third region 33, and the fourth region 34 are formed in each cell 22 in a divided manner from upstream to downstream. In order to divide and form these regions, a top seal 43, an upstream seal 44, a plurality of bending seal portions 46, and an expansion preventing seal 47 are formed along the conveying direction 20.

The tip seal 43 and the upstream seal 44 serve to form the common flow path 24, and the common flow path 24 is formed as an introduction port closed at either left or right end and open at the other end. The air introduced from the inlet port into the common flow path 24 is introduced from the upstream seal 44 into each cell 22, and expands a predetermined region of each cell 22. In order to prevent the air from flowing backward and being discharged from the expanded cells 22, a check valve 23 may be provided at an upstream end of each cell 22. The check valve 23 can be a sheet-like check valve having a structure shown in patent documents 1 to 3. Further, the check valve 23 may not be provided, but in this case, it is necessary to seal the upstream seal 44 with a seal or the like after the cell 22 is inflated.

The folding seal portion 46 is configured to facilitate folding of the expanded cell 22, and seals only a part of the cell 22 in the width direction, and allows air to flow through the other part. In this example, each cell 22 is divided into 4 regions by forming the folding seal 46 in 3 stages from upstream to downstream.

As shown in fig. 1(a), in this embodiment, the expansion package 13 has a substantially rectangular parallelepiped shape, the first region 31, the second region 32, the third region 33, and the fourth region 34 are wound around the object to be packed 14 so as to correspond to four surfaces of the object to be packed, and the common flow path 24, the bottom seal 45, and the lower end residual portion 38 between the lower end edges of the films 21 are fixed by a seal, an adhesive tape, or the like as necessary.

The front and rear surfaces of the inflatable package 13 are folded by the cell seal 41, so that the left and right sides of the first region 31 and the third region 33 can be covered with the inflated cells 22 at the time of air introduction. Then, the overlapping portion 27 is folded and overlapped on the front surface side of the expanded cell 22. The overlapping portion 27 defines a non-expansion scheduled region 35 on both right and left sides of the second region 32 and the fourth region 34, and is a non-expansion region 36 that does not expand even if air is introduced into the unit 22. The overlapped portion 27 formed by the non-expanded region 36 is folded and overlapped, and the object to be packed 14 is packed in a so-called cream candy packing form, and is fixed by a fixing member or the like as necessary, whereby the expanded package 13 having a substantially rectangular parallelepiped shape shown in fig. 1(a) is obtained.

(with respect to the non-expanded predetermined region 35)

The non-expansion region 35 may be provided to form the overlapping portion 27 as described above, or may be provided to form the arrangement portion 26 for attaching the flat sheet 25 such as a bill. The flat sheet 25 may be various display sheets such as a bill, an address label, and an operation note sheet, or may be a transparent insertion body for inserting the sheet. Further, the space may be a space in which direct writing with oil-based ink or the like is easy.

The non-expansion region 36 can be obtained by closing the upstream side and the downstream side of the non-expansion planned region 35 with the expansion-preventing seals 47 shown in fig. 3. This prevents air from being introduced into the non-expanded region 36 even when air is introduced, and allows the non-expanded region 36 to maintain a flat sheet shape without being expanded. The expansion preventing seal 47 can be provided at the stage of the primary sheet body 11 for expansion as well as at the stage of the secondary sheet body 12 for expansion as a subsequent processing form, but the mode of providing the secondary sheet body 12 for expansion is advantageous in that the versatility of the mold for producing the primary sheet body 11 for expansion can be improved.

(concerning the communicating portion 42)

By forming the non-expansion region 36 in the midstream section from the upstream side to the downstream side, air is not introduced into the region 37 on the downstream side, and therefore, the air is not expanded. However, as the buffer, it is preferable to introduce air into the downstream region 37 and expand it. To correspond to this, a communication portion 42 is formed in the downstream region 37. By forming the communication portion 42, air can be introduced from the other adjacent cell 22 and expanded.

The communicating portions 42 may be provided only in the region 37 on the downstream side of the non-inflating region 36, but in the present embodiment, the communicating portions 42 are formed in all the cell seals 41 at the stage of the inflating primary sheet body 11 in view of mass productivity. Specifically, the communicating portions 42 are provided in all the cell seals 41 in the upper and lower two stages downstream of the non-planned-for-inflation region 35 which is the overlapping portion 27 and downstream of the non-planned-for-inflation region 35 which is the arrangement portion 26. In each stage, it is preferable to align the positions of the communication portions 42 provided in the unit seals 41. That is, the distances from the upstream ends of the cells 22 to the communication portion 42 are preferably made equal.

(for expansion secondary sheet 12)

The secondary sheet body 12 for expansion shown in fig. 3 is obtained by further processing the primary sheet body 11 for expansion, and the expansion package body 13 of fig. 1 is obtained by packing the packaged objects 14 by introducing air from the common flow path 24 using the completed secondary sheet body 12 for expansion.

In the secondary sheet body 12 for inflation, the upstream side and the downstream side of the region 35 to be unexpanded 35 are closed by the expansion preventing seal 47, the region 36 to be unexpanded is formed by forming the expansion preventing seal 47, and the communicating portion 42 is selectively closed by forming the closing seal 48 with respect to the region 35 to be unexpanded. Specifically, the closing seal 48 is not applied to the communicating portion 42 of the region 37 on the downstream side of the non-inflated region 36, and the closing seal 48 is formed only to the communicating portion 42 of the cell 21 having no non-inflated region 36.

By forming the expansion preventing seal 47 in this manner, even when air is introduced into the cell 22, air is not introduced into the non-expanded region 36, and a flat sheet shape can be maintained. On the other hand, the region 37 on the downstream side of the non-expansion region 36 can be expanded because air is introduced from the adjacent cell 22 through the communication portion 42 that is not closed. Further, the communication portion 42 of the cell 21 without the non-expansion region 36 can be provided with the closing seal 48, so that the independence of the cells 21 can be obtained.

(expansion package 13)

Air is introduced from the common flow path 24 into the completed secondary sheet 12 for inflation to inflate the cells 22, and the objects 14 are packed, thereby completing the inflated packed body 13. If necessary, the required portion of the inflatable package 13 may be fixed by a fixing member such as an adhesive tape so as not to unravel the package. In this example, as described above, air is introduced from the common flow path 24 to inflate the cells 22, thereby wrapping the object to be packed 14 in a so-called cream-packed state. At this time, the overlapped portion 27 is folded along the folding line 28, but since the portion is not expanded, the folding can be smoothly performed, and it is not necessary to perform a special process on the folding line 28. Further, the flat sheet 25 can be reliably stuck to the non-swelling arrangement portion 26. It is preferable that the air be introduced prior to the packing of the object to be packed 14, but any air may be introduced prior to the packing.

(Another embodiment)

In the above-described embodiment shown in fig. 1 to 3, the joining portion of the expansion sheet body in the expansion package 13 (more specifically, the joining portion s of the upper and lower sides of the expansion secondary sheet body 12 in fig. 3) is located in the vicinity of one side of the expansion package 13 having a rectangular parallelepiped shape (in the vicinity of the lower right or lower left ridge line in fig. 1).

In contrast, in the other embodiment shown in fig. 4 and 5, the joining portion s of the expansion sheet body in the expansion package 13 is located in the vicinity of the center of one surface of the expansion package 13 having a rectangular parallelepiped shape (in the vicinity of the center of the lower surface in fig. 4).

Therefore, as shown in fig. 5, the primary sheet for expansion 11 has a fifth region 39 divided into 5 regions in total, in addition to the first region 31, the second region 32, the third region 33, and the fourth region 34, and accordingly, 4 stages of folding seal portions 46 are provided.

In addition, although the non-expansion scheduled region 35 provided in the fourth region 34 is located at the most downstream side of the primary sheet for expansion 11 in the previous embodiment, since the fifth region 39 is present on the downstream side of the non-expansion scheduled region 35 of the fourth region 34 in the present embodiment, the communication portion 42 is also provided in the cell seal 41 in the fifth region 39.

In the present embodiment, the communicating portion 42 is provided only in the cell seal 41 belonging to the region 37 on the downstream side of the non-planned-for-inflation region 35 for the arrangement portion 26 in the third region 33, and the communicating portion 42 on the upstream side of the non-planned-for-inflation region 35 for the arrangement portion 26 is omitted, but the communicating portion 42 may be provided also in this portion as in the previous embodiments.

Further, the expansion preventing seal 47 for forming the non-expanded region 36 is formed thicker than in the previous embodiment, and heat sealing is repeated also at the portion of the cell seal 41, whereby the non-expanded region 36 can be formed more reliably. The seal 48 provided in the secondary sheet body 12 for expansion may have a width larger than that of the cell seal 41 and a length slightly longer than that of the communication portion 42, thereby suppressing leakage of fluid due to positional deviation.

(still another embodiment)

In the above two embodiments, the non-expanded region 36 to be the overlapping portion 27 is disposed outside the expanded cell 22.

In contrast, in the embodiment shown in fig. 6, the overlapping portion 27 is folded inward of the inflated cell 22 and is hidden from the outside, and the other points are the same as those in the previous embodiments.

The joining portion of the inflatable sheet body can be arbitrarily selected from the portions shown in fig. 1 and 4, and the overlapping portion 27 disposed on the inner side and the overlapping portion 27 disposed on the outer side of the inflated cells 22 can be mixed.

The illustrated embodiments show only one form of the inflated package 13, and the present invention can be applied to various package forms. For example, the simple bag-like packaging form can be implemented as a packaging form in which the arrangement portion 26 of the flat sheet 25 is provided, and can also be applied to the packaging forms shown in patent documents 2 and 3. In addition, even in the same configuration of the cream candy package as shown in the figure, the number and length of the units 22 can be changed by changing the positions and sizes of the placement portions 26 and the overlapping portions 27 of the flat sheet 25 depending on the size. In the example of fig. 2 and 3, only the lower-stage communication portion 42 may be provided without providing the upper-stage communication portion 42.

In the embodiment, the present invention is carried out in two stages of the primary sheet body 11 for expansion and the secondary sheet body 12 for expansion, but the secondary sheet body 12 for expansion may be continuously produced in a finished form in a series of production lines. However, by separating the production line for producing the primary sheet body 11 for expansion from the production line for producing the secondary sheet body 12 for expansion, mass productivity and small product variety compatibility can be improved. Specifically, a primary roll in which the primary sheet body 11 for expansion is continuously provided can be produced at a sheet production site, the primary roll is carried into a logistics site where a packaging operation is performed, the primary sheet body 11 for expansion is processed in a form corresponding to the object to be packaged 14 to complete the secondary sheet body 12 for expansion, and the object to be packaged 14 can be packaged by the completed secondary sheet body 12 for expansion. Even when both the primary sheet body 11 for expansion and the secondary sheet body 12 for expansion are produced at the site of sheet production, mass productivity and small-product compatibility can be achieved by using a common die having high versatility in producing the primary sheet body 11 for expansion and by locally processing the obtained primary sheet body 11 for expansion alone with the secondary sheet body 12 for expansion.

Description of reference numerals

11 Disposable sheet for expansion

12 secondary sheet for expansion

13 expansion package

14 to-be-packed article

21 film

22 unit

23 check valve

24 common flow path

25 plane sheet

26 arrangement part

27 overlap portion

28 crease line

31 first region

32 second region

33 third region

34 fourth region

35 non-expanded predetermined area

36 non-expanded region

37 downstream side region

38 lower end remainder

39 fifth region

41 unit seal

42 communication part

43 tip seal

44 upstream seal

45 bottom seal

46 sealing part for bending

47 expansion stop seal

48 closure seal

Claims

1. An inflation sheet body configured such that a plurality of cells defined by cell seals that join superposed films to each other are arranged adjacent to each other, and the cells are inflated by introducing a fluid into the cells from an upstream side,

at least one of the cells has a non-expansion region in which the cell does not expand in a midstream section from the upstream side to the downstream side,

the cell having the non-expanded region is provided with a communication portion that allows the fluid to flow between the adjacent cells in the cell seal on the downstream side of the non-expanded region,

the region of the cell on the downstream side of the non-expansion region is expanded by the fluid from the communication portion.

2. The intumescent sheet of claim 1,

the surface side of the non-expansion region is a disposition portion of the planar sheet.

3. The intumescent sheet of claim 1 or 2,

a folding seal portion is provided in at least one of the cells, and the cells are folded from the folding seal portion, whereby the expansion sheet body is provided with a three-dimensional shape.

4. The expansion sheet according to any one of claims 1 to 3,

the sheet for expansion includes an overlapping portion where the cells overlap each other, and at least one of the cells in the overlapping portion is the non-expansion region.

5. A packaging body based on an expansion sheet, characterized in that,

the package based on the expansion sheet comprises: the intumescent sheet of any one of claims 1 to 4; and a packaged article packaged by the expansion sheet, wherein the non-expansion region of the cell is not expanded, and a region on the downstream side of the non-expansion region is expanded.

6. A primary sheet for inflation, which is configured such that a plurality of cells defined by cell seals that join superposed films to each other are arranged adjacent to each other, and the cells are inflated by introducing a fluid into the cells from the upstream side,

at least one of the cells has a non-expansion scheduled region in which the cell is not expanded in a midstream section from the upstream side to the downstream side,

the plurality of cells including the cell having the planned non-expansion region are provided with a communication portion that allows the fluid to flow between the adjacent cells at a position downstream of the planned non-expansion region,

in the inflatable primary sheet body, the communication portion downstream of the non-inflatable region is not provided with the sealing material, and the other communication portions are provided with the sealing material, whereby the inflatable sheet body inflated in the region downstream of the non-inflatable region can be obtained.

7. A packaging method based on an expansion sheet is characterized in that,

after the secondary sheet for expansion is produced by applying the expansion preventing seal and the closing seal to the primary sheet for expansion according to claim 6, the packaged object is wrapped with the secondary sheet for expansion, and air is introduced as the fluid into the cell from the upstream side of the cell, thereby producing a packaged object expanded in a region on the downstream side of the non-expanded region.