U.S. patent application number 17/293098 was filed with the patent office on 2022-01-06 for packaging bag.
This patent application is currently assigned to OJI HOLDINGS CORPORATION. The applicant listed for this patent is OJI HOLDINGS CORPORATION. Invention is credited to Yoshiyuki ASAYAMA.
Application Number | 20220002059 17/293098 |
Document ID | / |
Family ID | |
Filed Date | 2022-01-06 |
United States Patent
Application |
20220002059 |
Kind Code |
A1 |
ASAYAMA; Yoshiyuki |
January 6, 2022 |
PACKAGING BAG
Abstract
A packaging bag includes a first face including a first edge
disposed on a first side of an opening; a second face facing the
first face and including a second edge disposed on a second side of
the opening; and a cushion in an expandable sheet form and being
suspended between the first edge and the second edge, and in which
a plurality of slits extending in a direction intersecting a
suspension direction are provided in a staggered manner, wherein a
percentage of a basis weight of a sheet material forming the
cushion with respect to a basis weight of a sheet material forming
the first face and the second face is 55 to 80%.
Inventors: |
ASAYAMA; Yoshiyuki; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
OJI HOLDINGS CORPORATION |
Tokyo |
|
JP |
|
|
Assignee: |
OJI HOLDINGS CORPORATION
Tokyo
JP
|
Appl. No.: |
17/293098 |
Filed: |
November 12, 2019 |
PCT Filed: |
November 12, 2019 |
PCT NO: |
PCT/JP2019/044411 |
371 Date: |
May 12, 2021 |
International
Class: |
B65D 81/03 20060101
B65D081/03 |
Claims
1. A packaging bag comprising: a first face comprising a first edge
disposed on a first side of an opening; a second face facing the
first face and comprising a second edge disposed on a second side
of the opening; and a cushion in an expandable sheet form and being
suspended between the first edge and the second edge, and in which
a plurality of slits extending in a direction intersecting a
suspension direction are provided in a staggered manner, wherein a
percentage of a basis weight of a sheet material forming the
cushion with respect to a basis weight of a sheet material forming
the first face and the second face is 55 to 80%.
2. The packaging bag according to claim 1, wherein the cushion is
provided so as not to contact with a bottom when in an expanded
state.
3. The packaging bag according to claim 1, wherein the cushion
comprises a paste end pasted to an inner face of the first edge or
the second edge.
4. The packaging bag according to claim 1, wherein the first face,
the second face, and the cushion are made of a same material.
5. The packaging bag according to claim 1, wherein the cushion is
suspended in a folio state between the first edge and the second
edge.
6. The packaging bag according to claim 2, wherein the cushion
comprises a paste end pasted to an inner face of the first edge or
the second edge.
7. The packaging bag according to claim 2, wherein the first face,
the second face, and the cushion are made of a same material.
8. The packaging bag according to claim 3, wherein the first face,
the second face, and the cushion are made of a same material.
9. The packaging bag according to claim 6, wherein the first face,
the second face, and the cushion are made of a same material.
10. The packaging bag according to claim 2, wherein the cushion is
suspended in a folio state between the first edge and the second
edge.
11. The packaging bag according to claim 3, wherein the cushion is
suspended in a folio state between the first edge and the second
edge.
12. The packaging bag according to claim 4, wherein the cushion is
suspended in a folio state between the first edge and the second
edge.
13. A packaging bag comprising: a first face part comprising a
first edge portion disposed on a first side of an opening; a second
face part facing the first face part and comprising a second edge
portion disposed on a second side of the opening; and a cushion
part in an expandable sheet form and being suspended between the
first edge portion and the second edge portion, and in which a
plurality of slits extending in a direction intersecting a
suspension direction are provided in a staggered manner, wherein a
percentage of a basis weight of a sheet material forming the
cushion part with respect to a basis weight of a sheet material
forming the first face part and the second face part is 55 to 80%.
Description
TECHNICAL FIELD
[0001] The present case relates to a bag for packaging an
article.
BACKGROUND ART
[0002] The conventionally used packaging materials include cushion
materials such as air cushions provided with multiple air chambers,
expandable foam cushions, and single-faced corrugated boards, all
of which are in sheet forms deformable in thickness directions.
Articles packaged in such cushion materials are sometimes received
in packaging bags when transported or stored.
[0003] For this reason, packaging bags having the cushion materials
have been developed. For example, a proposed packaging bag has a
structure in which edges of a pair of sheets provided with multiple
air chambers are sealed to each other (see Patent Literature
1).
PRIOR ART DOCUMENTS
Patent Literature
[0004] Patent Literature 1: Japanese Laid-Open Patent Publication
No. 2003-182774
SUMMARY OF INVENTION
Problem to be Solved by Invention
[0005] However, if the packaging bag is provided with the cushion
material deformable in the thickness direction as described above,
there is a problem that the packaging bag becomes bulky due to the
thickness of the cushion material even before the article is put
into the packaging bag, that is, when the packaging bag has not yet
been used.
[0006] The packaging bag of the present case has been conceived in
view of the above-mentioned problems, and one of the objects
thereof is to suppress bulkiness in an unused state. The objects of
the present case should not be limited to this, and may also be
regarded as to yield actions and effects that are derived from each
configuration described in the following "DESCRIPTION OF
EMBODIMENTS" and that cannot be obtained by the conventional
techniques.
Means to Solve Problem
[0007] (1) A packaging bag disclosed herein includes: a first face
part having a first edge portion disposed on a first side of an
opening; and a second face part facing the first face part and
having a second edge portion disposed on a second side of the
opening. In addition, the packaging bag includes a cushion part in
an expandable sheet form and being suspended between the first edge
portion and the second edge portion, and in which a plurality of
slits extending in a direction intersecting a suspension direction
are provided in a staggered manner, wherein a percentage of a basis
weight of a sheet material forming the cushion part with respect to
a basis weight of a sheet material forming the first face part and
the second face part is 55 to 80%.
[0008] (2) Preferably, the cushion part is provided so as not to
contact with a bottom part when in an expanded state.
[0009] (3) Preferably, the cushion part has a paste end portion
pasted to an inner face of the first edge portion or the second
edge portion.
[0010] (4) Preferably, the first face part, the second face part,
and the cushion part are made of a same material.
[0011] (5) Preferably, the cushion part is suspended in a folio
state is between the first edge portion and the second edge
portion.
Effects of Invention
[0012] According to the packaging bag of the present case, placing
an article in the packaging bag causes the cushion part in a sheet
form to expand and develop three-dimensional cushion cells
associated with the slits, so that a cushioning property can be
obtained in the packaging bag by the cushion cells. Moreover, since
the cushion part is in a sheet form, the bulkiness of the packaging
bag in the unused state can be suppressed as compared with
packaging bags using cushion materials such as air cushions and
foaming cushions, which are provided with deformation margins for
cushioning.
[0013] Further, since the percentage of the basis weight of the
sheet material forming cushion part with respect to the basis
weight of the sheet material forming the first face part and the
second face part is 55 to 80%, the packaging bag of the present
case is excellent in an impact absorbing property at the time of
being dropped or colliding.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a perspective view illustrating a packaging bag in
an unused state.
[0015] FIG. 2 is a longitudinal sectional view of FIG. 1.
[0016] FIG. 3 is an enlarged plan view illustrating a main part of
a cushion part in an unexpanded state.
[0017] FIG. 4 is a longitudinal sectional view illustrating the
packaging bag during use.
[0018] FIG. 5 is an enlarged perspective view of the main part of
the cushion part in an expanded state.
[0019] FIG. 6 is a cross-sectional view illustrating a section A-A
of FIG. 5.
[0020] FIG. 7 is a developed view for explaining configuration of a
packaging bag.
[0021] FIG. 8 is a perspective view of the packaging bag that can
be assembled from the developed view of FIG. 7.
[0022] FIG. 9 is a perspective view illustrating another embodiment
of the packaging bag.
DESCRIPTION OF EMBODIMENTS
[0023] A packaging bag as an embodiment will now be described with
reference to the drawings. It should be noted that the following
embodiments are merely illustrative, and there is no intention to
exclude the application of various modifications and techniques not
explicitly described in the following embodiments. Each
configuration of the present embodiments can be variously modified
and implemented without departing from the gist thereof. Also, it
can be selected as necessary, or it can be combined as
appropriate.
[0024] A packaging bag is a bag for packaging an article(s). The
present embodiments describe a packaging bag in which a cushion
part for protecting an article to be packaged is provided in a base
bag.
[0025] The base bag and the cushion part both of which configure
the packaging bag, are preferably made of the same material such as
paper or resin. However, the base bag and the cushion part may be
made of different materials.
[0026] The following embodiments describe the packaging bag in a
state where an opening is arranged upwards. It should be noted that
the acting direction of the gravity is referred to as a downward
direction, and the opposite direction of the downward direction is
referred to as an upward direction.
[1. Configuration of Packaging Bag]
[0027] Firstly, with reference to FIGS. 1 and 2, the base bag 10 of
the packaging bag will be described.
[0028] The base bag 10 is provided in a gusset-less envelope type
with the opening 9 that is opened and closed by a flap 19 formed at
the top thereof. Here, a rectangular envelope is exemplified as the
base bag 10, but alternatively, an elongated envelope or a
western-style envelope may be used as the base bag.
[0029] The base bag 10 is provided with a first face part 11 and a
second is face part 12 that face each other.
[0030] These face parts 11, 12 are connected to each other at: a
bottom part 13 provided below the opening 9 in the base bag 10; and
two side parts 14, 15 each vertically extending so as to connect
the bottom part 13 and the opening 9. Further, an upper edge
portion (first edge portion) 110 of the first face part 11 is
disposed on a first side (the upper right side in FIG. 1) of the
opening 9, and an upper edge portion (second edge portion) 120 of
the second face part 12 is disposed on a second side (the lower
left side in FIG. 1) of the opening 9.
[0031] Furthermore, the flap 19 is provided to protrude upward
continuously from the first face part 11.
[0032] FIG. 8 illustrates another example of the packaging bag of
the present invention. FIG. 7 is a developed view illustrating a
method (configuration) for assembling the packaging bag of FIG.
8.
[0033] To assemble the packaging bag illustrated in FIG. 8, a base
sheet member 10S for configuring the first face part 11 and the
second face part 12, and a cushion sheet member 20S to be assembled
to the cushion part 20 are prepared.
[0034] As illustrated in FIG. 7, in the base sheet member 10S, two
lateral creases R.sub.X1 and R.sub.X2 (bend lines) each extending
in an X direction are provided apart from each other in a Y
direction, and two longitudinal creases R.sub.Y1 and R.sub.Y2 (bend
lines) each extending in the Y direction are provided apart from
each other in the X direction. The lateral creases R.sub.X1 and
R.sub.X2 are arranged in this order toward a Y.sub.2 direction.
That is, a second lateral crease R.sub.X2 is arranged on the
Y.sub.2 direction side of a first lateral crease R.sub.X1. Of the
longitudinal creases R.sub.Y1 and R.sub.Y2, one being a first
longitudinal crease R.sub.Y1 is arranged on an X.sub.1 direction
side of the other one being a second longitudinal crease
R.sub.Y2.
[0035] Of the two lateral creases R.sub.X1 and R.sub.X2, the first
lateral crease R.sub.X1 is a bend line for sealing the base bag 10,
and the second lateral crease R.sub.X2 is a bend line for
assembling the base sheet member 10S into a bag shape.
[0036] The base sheet member 10S is bent at the second lateral
crease R.sub.X2 and the two longitudinal creases R.sub.Y1 and
R.sub.Y2.
[0037] The first lateral crease R.sub.X1, the second lateral crease
R.sub.X2, and the two longitudinal creases R.sub.Y1 and R.sub.Y2
form a rectangle outline that defines a first sheet piece 11S
corresponding to the first face part 11.
[0038] On the Y direction side with respect to the first sheet
piece 11S, a flap sheet piece 19S corresponding to the flap 19 is
continuously provided on the Y.sub.1 direction side via the first
lateral crease R.sub.X1, and a second sheet piece 12S corresponding
to the second face part 12 is continuously provided on the Y.sub.2
direction side via the second lateral crease R.sub.X2.
[0039] Further, on the X.sub.1 direction side and an X.sub.2
direction side with respect to the first sheet piece 11S, paste
margin sheet pieces 18S are continuously provided via the
longitudinal creases R.sub.Y1 and R.sub.Y2, respectively. The paste
margin sheet pieces 18S are attached to a surface (corresponding to
an outer face of the second face part 12) of the second sheet piece
12S to which the paste margin sheet pieces 18S face when the base
sheet member 10S is bent at the second lateral crease R.sub.X2.
[0040] Furthermore, at an edge portion on the Y.sub.1 direction
side in the first sheet piece 11S, a first base paste region 110S
to which the cushion sheet member 20S is attached is set.
Similarly, at an edge portion on the Y.sub.2 direction side in the
second sheet piece 12S, a second base paste region 120S to which
the cushion sheet member 20S is attached is set. The base paste
regions 110S, 120S are regions corresponding to inner faces 111,
121 of the upper edge portions 110, 120 of the above-described face
parts 11, 12, respectively. That is, the base paste regions 110S,
120S are provided on the respective surfaces of the first sheet
piece 11S and the second sheet piece 12S, which surfaces are to be
arranged inside the base bag 10.
<Cushion Sheet Member>
[0041] As illustrated in FIG. 7, at respective end portions on the
Y.sub.1 direction side and the Y.sub.2 direction side of the
cushion sheet member 20S, cushion paste regions 21S, 22S (interior
edge regions), which are to be is attached to the base paste
regions 110S, 120S (exterior edge regions) are set. The cushion
paste regions 21S, 22S respectively correspond to paste end
portions 21, 22 of the above-described cushion part 20. It should
be noted that slits 23a are not provided in the cushion paste
regions 21S, 22S.
[0042] Further, the cushion sheet member 20S is provided with a
third lateral crease R.sub.X3 extending in the X direction
(predetermined direction) at a Y directional center thereof. The
third lateral crease R.sub.X3 is a bend line corresponding to a
fold line 230.
[0043] In a region excluding the cushion paste regions 21S, 22S,
the cushion sheet member 20S is provided with a main sheet piece
23S corresponding to a main portion 23. The main sheet piece 23S is
provided with the above-mentioned slits 23a in a staggered manner.
Each slit 23a extends along the X direction.
[0044] Next, the cushion part 20 of the packaging bag will now be
described.
[0045] The cushion part 20 is also referred to as cushion paper,
honey paper, or the like, and is a cushion material in a sheet form
in which multiple slits 23a are provided in a staggered manner.
[0046] The cushion part 20 is connected and suspended between the
upper edge portion 110 of first face part 11 and the upper edge
portion 120 of the second face part 12.
[0047] The percentage of the basis weight of the sheet material
forming the cushion part 20 with respect to the basis weight of the
sheet material forming the first face part 11 and/or the second
face part 12 is 55 to 80%, and preferably, 60 to 75%. By setting
the percentage of the basis weight of the sheet material forming
the cushion part 20 with respect to the basis weight of the sheet
material forming the first face part 11 and/or the second face part
12 to 80% or less, it is possible to cause the cushion part 20 to
expand when an impact is subjected, so that the impact can be
absorbed. In addition, by setting the percentage of the basis
weight of the sheet material forming the cushion part 20 with
respect to the basis weight of the sheet material forming the first
face part 11 and/or the second face part 12 to 55% or more, it is
possible to absorb the impact acting on the article 1 (packaged
object) due to the appropriate control of the expansion of the
cushion part 20 when the impact is subjected.
[0048] The basis weight of the sheet material forming the first
face part 11 and/or the second face part 12 is, more preferably, 60
to 300 g/m.sup.2, and further preferably, 70 to 250 g/m.sup.2. By
setting the basis weight of the sheet material forming the first
face part 11 and/or the second face part 12 to 60 g/m.sup.2 or
more, it is possible to suppress buckling deformation of the first
face part 11 and/or the second face part 12 when loads are applied
to connection parts of the first face part 11 and/or the second
face part 12 and the cushion part 20 by the impact. By setting the
basis is weight of the sheet material forming the first face part
11 and/or the second face part 12 to 300 g/m.sup.2 or less, it is
possible to prevent the article 1 (packaged object) from being
damaged by providing the packaging bag with appropriate flexibility
that lowers the impact acceleration. In terms of packaging
workability, the face parts 11, 12 preferably have appropriate
stiffness, and specifically, the basis weight of the sheet material
forming the first face part 11 and/or the second face part 12 is
preferably set to 110 g/m.sup.2 or more.
[0049] The cushion part 20 is roughly classified into two parts:
the paste end portions 21, 22 respectively attached to the upper
edge portions 110, 120 of the face parts 11, 12; and the main
portion 23 provided inside the base bag 10 in a state of being
suspended (suspended state) between the paste end portions 21,
22.
[0050] Here, the first paste end portion 21 is attached to the
inner face 111 of the upper edge portion 110 of the first face part
11, and similarly, the second paste end portion 22 is attached to
the inner face 121 of the upper edge portion 120 of the second face
part 12. In contrast, the main portion 23 is not attached to any
part.
[0051] The cushion part 20 is, for example, in a folio state by
being folded at the fold line 230 at the center of a suspension
direction connecting the first paste end portion 21 and the second
paste end portion 22 along the cushion part 20.
[0052] The main portion 23 of the cushion part 20 folded in two in
this manner is, as illustrated in FIG. 2, roughly classified into
two parts: a first main portion 231 on the first paste end portion
21 side; and a second main portion 232 on the second paste end
portion 22 side, with the fold line 230 interposed
therebetween.
[0053] The main portion 23 expands by the weight of the article 1
when receiving the article 1 (see FIG. 4) inserted into the
packaging bag through the opening 9.
[0054] In other words, before the article 1 is inserted into the
packaging bag (in an unused state of the packaging bag), the
cushion part 20 is in a state of not being expanded (hereinafter
referred to as "unexpanded state"), and after the article 1 is
inserted into the packaging bag (during use of the packaging bag),
the cushion part 20 is in a state of being expanded (hereinafter
referred to as "expanded state").
[0055] The structure that allows the cushion part 20 to expand in
this manner is provided in the main portion 23.
[0056] Hereinafter, the main portion 23 in the unexpanded state
will be described, and thereafter, the main portion 23 in the
expanded state will be described.
[0057] First, with reference to FIG. 3, the main portion 23 in the
unexpanded state will be described.
[0058] A large number of slits 23a are cut and formed in the main
portion 23. These slits 23a are provided at least in the main
portion 23 of the cushion part 20.
[0059] Each of the slits 23a extends in a direction (hereinafter
referred to as "width direction") perpendicular to the suspension
direction (here, the vertical direction).
[0060] The slits 23a are provided intermittently along the width
direction in lines. That is, between the slits 23a adjacent to each
other in the width direction, non-slit parts 23b which are not cut,
are provided.
[0061] Assuming that the dimension of the slit 23a is "L.sub.1" and
the dimension of the non-slit part 23b is "L.sub.2", Inequality 1
"L.sub.1>L.sub.2" is satisfied.
[0062] Here, a first pattern P.sub.1 is defined as an alignment of
a single row in which the slits 23a and the non-slit parts 23b are
alternately arranged along the width direction. Further, a second
pattern P.sub.2 is defined as an alignment of another row in which
the slits 23a' and the non-slit parts 23b', which are displaced
from the slits 23a and the non-slit parts 23b of the first pattern
P.sub.1 by a half pitch, are alternately arranged along the width
direction. These first patterns P.sub.1 and second patterns P.sub.2
are provided alternately along the suspension direction.
[0063] More specifically, the width directional centers C.sub.a of
the slits 23a in the first patterns P.sub.1 and the width
directional centers C.sub.b' of the non-slit parts 23b' in the
second patterns P.sub.2 are arranged side by side along is the
suspension direction. Similarly, the width directional centers
C.sub.b of the non-slit parts 23b in the first patterns P.sub.1 and
the width directional centers C.sub.a' of the slits 23a' in the
second patterns P.sub.2 are arranged side by side along the
suspension direction.
[0064] The cushion part 20 having the main portion 23 provided with
such slits 23a, 23a' and non-slit parts 23b, 23b' is manufactured
by using a rotary die-cutter provided with blade portions (cutters)
in shapes corresponding to the shapes of the slits 23a, 23a' on its
outer periphery, and cutting a slit-less sheet member while
rotating the rotary die-cutter. Alternatively, the cushion part 20
is manufactured by using a flat die-cutter provided with blade
portions in shapes corresponding to the shapes of the slits 23,
23a', and cutting the slit-less sheet material while pressing the
sheet material.
[0065] A sheet piece on a side (the upper side in FIG. 3) in the
suspension direction with respect to the slit 23a in the first
pattern P.sub.1 is roughly classified into a first portion 31, a
second portion 32, and a third portion 33, depending on the
positions with respect to the slits 23a' and the non-slit part 23b'
in the second pattern P.sub.2.
[0066] The first portion 31 is a portion sandwiched between one
side (left side in FIG. 3) in the width direction of the slit 23a
in the first pattern P.sub.1 and the other side (right side in FIG.
3) in the width direction of the slit 23a' in the second pattern
P.sub.2. The second portion 32 is a portion is sandwiched between
the respective width directional centers of the slit 23a in the
first pattern P.sub.1 and the non-slit part 23b' in the second
pattern P.sub.2. The third portion 33 is a portion sandwiched
between the other side in the width direction of the slit 23a in
the first pattern P.sub.1 and the one side in the width direction
of the slit 23a' in the second pattern P.sub.2.
[0067] Further, a sheet piece on the other side in the suspension
direction with respect to the slit 23a in the first pattern P.sub.1
is roughly classified into a fourth portion 34, a fifth portion 35,
and a sixth portion 36, in the same manner as the above portions
31, 32, and 33.
[0068] The fourth portion 34 is sandwiched between the one side in
the width direction of the slit 23a in the first pattern P.sub.1
and the other side in the width direction of the slit 23a' in the
second pattern P.sub.2. The fifth portion 35 is sandwiched between
the respective width directional centers of the slits 23a in the
first pattern P.sub.1 and the non-slit part 23b' in the second
pattern P.sub.2. The sixth portion 36 is sandwiched between the
other side in the width direction of the slit 23a in the first
pattern P.sub.1 and the one side in the width direction of the slit
23a' in the second pattern P.sub.2.
[0069] Next, with reference to FIGS. 4, 5, and 6, the main portion
23 in the expanded state will now be described.
[0070] As illustrated in FIG. 4, the main portion 23 in the
expanded state, as compared with the main portion 23 in the
unexpanded state, extends in is the suspension direction. In the
main portion 23 at this time, the portions 31 to 36 (see FIGS. 5
and 6) rise from the suspension direction to a thickness direction
of the face parts 11, 12 (the thickness direction of the main
portion 23 in the unexpanded state), and three-dimensional cushion
cells 40 are formed by the risen portions 31 to 36. In other words,
by the rising of the portions 31 to 36 arranged around one slit
23a, one cushion cell 40 appears.
[0071] Specifically, as illustrated in FIG. 5, a first wall 41
corresponding to the first portion 31, a second wall 42
corresponding to the second portion 32, a third wall 43
corresponding to the third portion 33, a fourth wall 44
corresponding to the fourth portion 34, a fifth wall 45
corresponding to the fifth portion 35, and a sixth wall 46
corresponding to the sixth portion 36 each erect in the cushion
cell 40 so as to form the respective side walls of a hexagonal
tube.
[0072] Incidentally, in a state (hereinafter referred to as
"maximum expanded state") where the main portion 23 is
geometrically expanded to the maximum within a range of not being
torn, the first wall 41 and the fourth wall 44 extend along the
same plane, and the third wall 43 and the sixth wall 46 extend
along the other same plane to face the first wall 41 and the fourth
wall 44. Thus, in the cushion cell 40 in the maximum expanded
state, the walls 41 to 46 erect so as to form the respective side
walls of a square tube.
[0073] As illustrated in FIG. 4, the cushion part 20 in the
expanded state is provided so as not to contact with the bottom
part 13 of the base bag 10.
[0074] Specifically, the fold line 230 which locates at the lowest
position in the cushion part 20 in the maximum expanded state and
the bottom part 13 of the base bag 10 are provided so as not to
contact with each other. In other words, assuming that: the
vertical dimension between upper ends 21a, 22a of the paste end
portions 21, 22 of the cushion part 20 and the bottom part 13 of
the base bag 10 is "M.sub.1"; and the vertical dimension between
the upper ends 21a, 22a and the fold line 230 of the cushion part
20 in the maximum expanded state is "M.sub.2", Inequality 2
"M.sub.1>M.sub.2" is satisfied.
[0075] It is preferable to set the "M.sub.2" as large as possible
to approach the "M.sub.1" while satisfying Inequality 2.
[0076] Conversely, as illustrated in FIG. 2, the fold line 230 of
the cushion part 20 in the unexpanded state is provided above the
bottom part 13 of the base bag 10 by a predetermined dimension
"M.sub.3" in advance so that the cushion part 20 in the maximum
expanded state does not touch the bottom part 13 of the base bag
10. That is, the cushion part 20 is formed to be short in
anticipation of an extension margin.
[0077] Next, with reference to FIG. 4, description will now be made
in relation to a setting example of the dimensions of the cushion
part 20 for is realizing the above-described non-contact
structure.
[0078] Assuming that the number of rows of the patterns P.sub.1,
P.sub.2 in the cushion part 20 is N and a vertical dimension of
each paste end portion 21, 22 is M.sub.4, Approximation 3
"M.sub.2-M.sub.4.apprxeq.(L.sub.1-L.sub.2).times.(N/4)" is
established.
[0079] The left side of Approximation 3 represents the vertical
dimension of the first main portion 231 or the second main portion
232 in the maximum expanded state.
[0080] On the other hand, (L.sub.1-L.sub.2) of the right side of
Approximation 3 represents the dimension in the suspension
direction per cushion cell 40 in the maximum expanded state, that
is, the dimension in the suspension direction of the first wall 41
and the fourth wall 44.
[0081] Further, since the number of the cushion cells 40 aligned in
the main portion 23 is half (N/2) the number of rows of the
patterns P.sub.1, P.sub.2, the (N/4) on the right side of
Approximation 3 represents the number of the cushion cells 40
aligned in the suspension direction in the first main portion 231
or the second main portion 232.
[0082] When ignoring the dimensions in the suspension direction of
the second wall 42 and the fifth wall 45 extending in the width
direction, it can be regarded that the value (the right side of
Approximation 3), which is the number (N/4) of the cushion cells 40
aligned in the suspension direction in the first main portion 231
or the second main portion 232 multiplied by the dimension
(L.sub.1-L.sub.2) in the suspension direction per cushion cell 40
in the maximum expanded state, approximates the vertical dimension
is of the first main portion 231 or the second main portion 232 in
the maximum expanded state.
[0083] Therefore, by appropriately setting the parameters, such as
the width directional dimensions L.sub.1, L.sub.2 of the slits 23a
or the non-slit parts 23b, the number of rows of the patterns
P.sub.1, P.sub.2, and the vertical dimension M.sub.4 of each paste
end portion 21, 22, all of which correspond to the terms in
Approximation 3, it is possible to design the non-contact structure
described above.
[0084] In addition, the width directional dimension of the cushion
part 20 is set to be slightly smaller than the width directional
dimension of each of the face parts 11, 12.
[2. Procedures for Using Packaging Bag]
[0085] Next, a method for using the packaging bag will now be
described.
[0086] As illustrated in FIGS. 1 and 2, the flap 19 is firstly
opened to make the opening 9 accessible, unsealing the base bag
10.
[0087] Next, the article 1 is put into the packaging bag, and the
article 1 is placed on or inserted through the main portion 23 of
the cushion part 20. At this time, as illustrated in FIG. 4, the
main portion 23 of the cushion part 20 extends in the suspension
direction, and thereby, the slits 23a rise in the thickness
direction of the face parts 11, 12, and as illustrated in FIGS. 5
and 6, the cushion cells 40 appear in the main is portion 23.
[0088] After that, the flap 19 is attached to the upper edge
portion 120 of the second face part 12 of the base bag 10 to seal
the packaging bag. At this time, the article 1 is surrounded by the
cushion cells 40.
[3. Actions and Effects]
[0089] Since the packaging bag of the present embodiment is
configured as described above, the following actions and effects
can be obtained.
[0090] (1) Inserting the article 1 into the packaging bag and
placing the article 1 on the main portion 23 of the cushion part 20
cause the main portion 23 in a sheet form in the unexpanded state
to expand, and in the main portion 23 turned to the expanded state,
the three-dimensional cushion cells 40 associated with the slits
23a appear. With the cushion cells 40 appeared inside the base bag
10 surround the article 1, the protectability for the article 1 can
be ensured, and the cushioning property can be obtained in the
packaging bag.
[0091] In addition, since the main portion 23 in the unexpanded
state is in a sheet form, the bulkiness of the packaging bag in the
unused state can be suppressed as compared with the packaging bags
using cushion materials provided with deformation margins for
cushioning, such as air cushions, foaming cushions, and
single-faced corrugated boards.
[0092] Further, if a cushion material is provided separately from a
base bag in a conventional packaging bag, in order to fix the
cushion material is to the base bag, the entire cushion material
needs to be pasted to the base bag. In contrast, in the present
packaging bag, since the cushion part 20 is suspended, only some
portions of the cushion part 20 may be pasted to the base bag 10,
which reduces the usage of glue or adhesive.
[0093] In addition, since the cushion part 20 exhibits a cushioning
function by extending inside the base bag 10, the cushion part 20
is formed to be short in anticipation of the extension margin. This
can suppress the amount or weight of the cushion material as
compared with packaging bags using, as cushion materials,
single-faced corrugated boards manufactured by performing a process
(flute process) of corrugating planar material sheets.
[0094] (2) Since the cushion part 20 in the unexpanded state is
provided so as not contact with the bottom part 13, the contact
between the article 1 placed in the packaging bag and the bottom
part 13 of the base bag 10 is inhibited, and the protectability for
the article 1 can be enhanced.
[0095] (3) The paste end portions 21, 22 of the cushion part 20 are
respectively attached to the inner faces 111, 121 of the upper edge
portions 110, 120 of the base bag 10. This can suppress the amount
and/or weight of the material of the cushion part 20 as compared
with a packaging bag in which a cushion part is mountain-folded
between each paste end portion and a main portion to have the paste
end portions pasted to the outer faces of the upper edge portion
110, 120.
[0096] In addition, when the paste end portions 21, 22 are pasted
to the inner faces 111, 121, the flap 19 of the base bag 10 can be
prevented from interfering with the cushion part 20, achieving
smooth opening and closing operations of the opening 9.
[0097] (4) Since the base bag 10 which is configured by: the first
face part 11; the second face part 12; and the flap 19, and the
cushion part 20 are made of the same material, the processability
of the packaging bag after use can be enhanced. For example, when
the packaging bag is reused (recycled) or discarded, there is no
need to separate the packaging bag into each material, so that the
processing workability can be enhanced. If the base bag 10 and the
cushion part 20 are made of paper, the packaging bag after use can
be discharged directly to the recycling of used paper or as
combustible garbage.
[0098] (5) Since the cushion part 20 is suspended in the folio
state, the thickness of the packaging bag in the unused state can
be reduced as compared to, for example, a packaging bag in which a
cushion part is suspended in a state of being folded into three or
more.
[0099] Specifically, at portion where the main portion 23 is
provided in the packaging bag in the unused state, four sheet
pieces are laminated in the order of the first face part 11, the
first main portion 231, the second main portion 232, and the second
face part 12. In contrast, in a cushion part folded in three or
more, three or more main portions will be folded is and five or
more sheet pieces will be laminated. Therefore, since the thickness
of the folded main portion 23 is suppressed, the bulkiness of the
packaging bag can be suppressed.
[4. Miscellaneous]
[0100] Finally, other modifications of the present embodiment will
be described.
[0101] For example, the slits and the non-slit parts should not be
limited to the orientation extending in the width direction, and
only have to extend at least in a direction intersecting the
suspension direction. Such an orientation allows the cushion part
to extend in the suspension direction.
[0102] In addition, the base bag should not be limited to the
gusset-less envelope type provided with the flap 19, and may
alternatively be various types of bag such as a square bottom bag,
a gusset bag, or a stand up pouch, and may include gussets and/or
omit the flap.
[0103] If a flap-less bag is used as the base bag, the cushion part
may be mountain-folded between each of the paste end portions and
the main portion to have the paste end portions pasted to the outer
face of the upper edge portions 110, 120. In this case, by
suspending the cushion part so as to be hung from the face parts
11, 12, it is possible to reliably attach the cushion part to the
base bag, enhancing the load bearing property of the cushion
part.
[0104] In the modification illustrated in FIG. 9, the first paste
end portion 21 of the cushion part 20 includes a portion that
overlaps the flap 19 of the base bag 10. In this modification, the
first paste end portion 21 is bent together with the flap 19 to
cover the second face part from the outside in sealing, so that the
strength for suspending the packaged object can be enhanced.
EXAMPLES
[0105] Hereinafter, the characteristics of the present invention
will be further specifically described with reference to Examples
and Comparative Examples, however, the scope of the present
invention should not be construed as being limited by the specific
examples illustrated below.
<Preparation of Packaging Bag Samples>
[0106] A packaging bag sample illustrated in FIG. 8 was prepared.
The vertical dimension of the first face part (second face part)
was 300 mm, and the width directional dimension thereof was 240 mm.
The vertical dimension of the cushion part in a folio and in the
unexpanded state was 120 mm, and the width directional dimension
thereof was 240 mm. The cushion part was pasted to the upper edge
portions of the face parts with double-sided tapes.
[0107] As for the material of the first face part and the second
face part, and the material of the cushion part, those described in
Table 1 were used to prepare each packaging bag sample of the
Examples and Comparative Examples.
<Evaluation of Samples>
[0108] After inserting an impact accelerometer (product name:
G-menDR100, manufactured by SRIC Corporation) into each packaging
bag sample of Examples and Comparative Examples and sealing them,
free fall tests described in the impact test of JISZ0200 were
carried out, and the maximum values of the impact accelerations
were measured.
[0109] Table 1 shows the test results.
TABLE-US-00001 TABLE 1 Comparative Comparative Example 1 Example 2
Example 3 Example 4 Example 1 Example 2 Material (A) of Kraft Kraft
Kraft Kraft Kraft Kraft first and second paper paper paper paper
paper paper face parts 120 g/m.sup.2 148 g/m.sup.2 120 g/m.sup.2
148 g/m.sup.2 120 g/m.sup.2 148 g/m.sup.2 Material (B) of Kraft
Kraft Kraft Kraft Kraft Kraft cushion part paper paper paper paper
paper paper 70 g/m.sup.2 90 g/m.sup.2 90 g/m.sup.2 118 g/m.sup.2 50
g/m.sup.2 128 g/m.sup.2 (Basis weight of 58% 61% 75% 80% 42% 86%
B)/(Basis weight of A) Maximum value of 81 g/s.sup.2 78 g/s.sup.2
79 g/s.sup.2 80 g/s.sup.2 91 g/s.sup.2 92 g/s.sup.2 impact
acceleration
[0110] As shown by the test results in Table 1 above, as compared
with Comparative Examples 1 and 2, Examples 1 to 4 had smaller
impact accelerations and were superior in impact absorbing
velocities.
DESCRIPTION OF REFERENCE SIGNS
[0111] 1 article [0112] 9 opening [0113] 10 base bag [0114] 11
first face part [0115] 110 upper edge portion (first edge portion)
[0116] 111 inner face [0117] 12 second face part [0118] 120 upper
edge portion (second edge portion) [0119] 121 inner face [0120] 13
bottom part [0121] 14,15 side part [0122] 19 flap [0123] 20 cushion
part [0124] 20S cushion sheet member [0125] 21 first paste end
portion [0126] 21a upper end [0127] 22 second paste end portion
[0128] 22a upper end [0129] 23 main portion [0130] 230 fold line
[0131] 231 first main portion [0132] 232 second main portion [0133]
23a,23a' slit [0134] 23b,23b' non-slit part [0135]
31,32,33,34,35,36 portion [0136] 40 cushion cell [0137]
41,42,43,44,45,46 wall [0138] C.sub.a,C.sub.a' width directional
center of slit 23a,23a' [0139] C.sub.b,C.sub.b' width directional
center of non-slit part 23b,23b' [0140] L.sub.1 width directional
dimension of slit 23a,23a' [0141] L.sub.2 width directional
dimension of non-slit part 23b,23b' [0142] M.sub.1 vertical
dimension between upper end 21a,22a and bottom part 13 of base bag
20 [0143] M.sub.2 vertical dimension between upper end 21a,22a and
fold line 230 in maximum expanded state [0144] M.sub.3 vertical
dimension from bottom part 13 to fold line 230 in unexpanded state
[0145] M.sub.4 vertical dimension of paste end portion 21,22 [0146]
N number of rows of pattern P.sub.1,P.sub.2 [0147] P.sub.1 first
pattern [0148] P.sub.2 second pattern
* * * * *