U.S. patent application number 10/585688 was filed with the patent office on 2008-12-04 for display strip and commodity display unit.
Invention is credited to Yoshio Iwasaki.
Application Number | 20080296446 10/585688 |
Document ID | / |
Family ID | 35783848 |
Filed Date | 2008-12-04 |
United States Patent
Application |
20080296446 |
Kind Code |
A1 |
Iwasaki; Yoshio |
December 4, 2008 |
Display Strip and Commodity Display Unit
Abstract
It is the object of the invention to provide a display strip
having sufficient punch hole strength for allowing a plurality of
product-enclosed bags to be attached thereto for the purpose of
arrangement and display, and package assembly. The invention is a
display strip for allowing a plurality of product-enclosed bags to
be attached thereto for the purpose of arrangement and display,
which at least comprises a substrate layer containing a woven
fabric and a sealant layer having heat-sealability, a punch hole
being formed at an upper portion for hanging.
Inventors: |
Iwasaki; Yoshio; ( Shiga,
JP) |
Correspondence
Address: |
HOGAN & HARTSON L.L.P.
1999 AVENUE OF THE STARS, SUITE 1400
LOS ANGELES
CA
90067
US
|
Family ID: |
35783848 |
Appl. No.: |
10/585688 |
Filed: |
July 7, 2005 |
PCT Filed: |
July 7, 2005 |
PCT NO: |
PCT/JP2005/012604 |
371 Date: |
August 21, 2008 |
Current U.S.
Class: |
248/95 |
Current CPC
Class: |
B65D 73/0028 20130101;
B32B 2262/0253 20130101; B32B 27/12 20130101; B32B 3/266 20130101;
B32B 5/024 20130101; A47F 5/0884 20130101 |
Class at
Publication: |
248/95 |
International
Class: |
B65B 67/12 20060101
B65B067/12 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 8, 2004 |
JP |
2004-202150 |
Claims
1. A display strip for allowing a plurality of product-enclosed
bags to be attached thereto for the purpose of arrangement and
display, which at least comprises a substrate layer containing a
woven fabric and a sealant layer having heat-sealability, a punch
hole being formed at an upper portion for hanging.
2. The display strip according to claim 1, wherein the substrate
layer is a laminate of the woven fabric and a resin film.
3. The display strip according to claim 2, wherein the substrate
layer is a laminate having a structure with the woven fabric
sandwiched between two resin films.
4. The display strip according to claim 2 or 3, wherein the resin
film is a polyolefin film or a polyester film.
5. The display strip according to claim 1, wherein the substrate
layer is a laminate with the woven fabric and paper laminated via a
resin layer or an adhesive.
6. The display strip according to claim 5, wherein the resin layer
comprises polyolefin.
7. The display strip according to claim 1, wherein the woven fabric
comprises polyolefin yarn.
8. The display strip according to claim 7, wherein the polyolefin
yarn is monofilament yarn, multifilament yarn, flat yarn or split
yarn.
9. The display strip according to claim 1, wherein the woven fabric
comprises warp yarn and weft yarn having fineness thicker than that
of the warp yarn.
10. The display strip according to claim 9, wherein the warp yarn
comprises flat yarn or split yarn and the weft yarn comprises
monofilament yarn or multifilament yarn in the woven fabric.
11. The display strip according to claim 1, wherein the sealant
layer comprises a low melting point resin.
12. The display strip according to claim 1, which has an
intermediate layer comprising a resin between the substrate layer
and the sealant layer.
13. The display strip according to claim 12, wherein the
intermediate layer comprises polyolefin.
14. Package assembly, which comprises the display strip according
to claim 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12 or 13 and a
product-enclosed bag, the display strip and the product-enclosed
bag being bonded by heat sealing.
Description
TECHNICAL FIELD
[0001] The invention relates to a display strip having sufficient
punch hole strength for allowing a plurality of product-enclosed
bags to be attached thereto for the purpose of arrangement and
display, and package assembly.
BACKGROUND ART
[0002] Some products such as snack foods are generally packed in
pillow packages (such as vertical pillow types and horizontal
pillow types) and sold. In many cases, such product-enclosed bags
are arranged on display racks in stores and sold. In such cases,
each and every bag has to be placed on the racks by hand, and the
display place for sale is restricted only to the given display
racks.
[0003] A known display method for product sale, called strip bag
display, requires no display rack. As shown in FIG. 1, the strip
bag display is a display form in which plurality of products are
each attached to a tape material with a certain width, called a
display strip, and hung. This display form needs no display rack
and enables display and sale at any place such as a place beside a
register in a store and a front desk area in a hotel.
[0004] In a conventional display strip form, for example, a
pressure-sensitive adhesive tape is fixed on the back side of a
paper or resin tape that has preliminarily punched holes in certain
positions, through which product-enclosed bags are each attached to
the pressure-sensitive adhesive tape. In another form, for example,
a paper or resin tape has resin hooks preliminarily fixed thereon
in certain positions, and product-enclosed bags are each punched
and hung on the hook through the punched hole. However, these
display strip forms have difficulty in automating the process of
attaching product-enclosed bags to the display strip. Thus, the
strip bag display has not been widely used yet.
[0005] Against this problem, yet another display strip is proposed
which has a heat sealing layer on one side such that
product-enclosed bags can be directly bonded to the display strip
by heat sealing (for example, see Patent Documents 1 to 4 listed
below). With this display strip, it is very easy to automate a
continuous process including the steps of enclosing a product in a
bag and attaching the product-enclosed bag to the display
strip.
[0006] One end of such a display strip is hung on a hook provided
on a rack and the like in order to display a plurality of the
product-enclosed bags which are arranged and fixed on the display
strip. For such display by hanging on the hook, a punch hole is
generally formed at an end portion of the display strip. The hole
punching process can easily be performed by punching using a punch
and thus is preferably used for mass production at low cost.
However, the display strip can often be broken at the punch hole
portion, even though it is designed to have sufficient strength for
use in a state where a specific number of product-enclosed bags are
attached to it and even though it is designed to have a strength
that enables it to withstand an impact when the displayed
product-enclosed bag is pulled and peeled.
[0007] Patent Document 1: WO 98/52823
[0008] Patent Document 2: U.S. Pat. No. 3,864,895
[0009] Patent Document 3: U.S. Pat. No. 5,366,777
[0010] Patent Document 4: U.S. Pat. No. 5,433,060
DISCLOSURE OF THE INVENTION
Problems Which the Invention is to Solve
[0011] Under the circumstances, it is an object of the invention to
provide a display strip having sufficient punch hole strength for
allowing a plurality of product-enclosed bags to be attached
thereto for the purpose of arrangement and display, and package
assembly.
Means for Solving the Object
[0012] The invention is a display strip for allowing a plurality of
product-enclosed bags to be attached thereto for the purpose of
arrangement and display, which at least comprises a substrate layer
containing a woven fabric and a sealant layer having
heat-sealability, a punch hole being formed at an upper portion for
hanging.
[0013] The invention is described in detail below.
[0014] The inventors have made investigations on a cause of the
frequent breakage of the conventional display strip at the punch
hole portion and finally found that the punch hole strength is
extremely reduced when a notch-like incision is formed at the punch
hole portion due to blunting of the edge of the knife for forming
punch holes. Such a notch is inevitably formed as long as a hole
punching process with a punch is performed. The inventors have made
further investigations and finally found that if a woven
fabric-containing substrate layer is used, the extreme reduction in
punch hole strength can be inhibited even when a notch is formed,
so that the invention has been completed.
[0015] The display strip of the invention comprises at least a
substrate layer and a sealant layer. The substrate layer contains a
woven fabric. An extreme reduction in punch hole strength can be
inhibited by the use of such a substrate layer, even when a notch
is formed.
[0016] The substrate layer is not particularly limited, but it is
preferably a laminate with the woven fabric and a resin film
laminated, particularly preferably a laminate having a structure
with the woven fabric sandwiched between two resin films
(hereinafter also referred to as "the laminate in the first
aspect") or a laminate with the woven fabric and paper laminated
via a resin layer or an adhesive (hereinafter also referred to as
"the laminate in the second aspect").
[0017] The woven fabric is not particularly limited, but woven
fabrics produced by weaving fibers which are conventionally used as
reinforcing materials by any known conventional method such as
plain weaving, twill weaving and leno weaving. The density of weave
of the woven fabric is not particularly limited, but it is
preferably about 4 to 20 per inch. When the woven fabric is
laminated to a resin film, any appropriate space between warp yarn
and weft yarn can improve the adhesion between the woven fabric and
the resin film, because part of the resin of the resin film can be
infiltrated into the space between the warp yarn and the weft yarn
of the woven fabric and integrated with the woven fabric.
[0018] The woven fabric is not particularly limited, but it
preferably comprises polyolefin yarn such as high density
polyethylene yarn, low density polyethylene yarn, metallocene
linear low-density polyethylene yarn, isotactic polypropylene yarn,
and syndiotactic polypropylene yarn, in view of mechanical
performance, and adhesion to the resin film and the like, which are
required for the display strip. The polyolefin yarn may comprise a
single resin, it may be a sheath-core type bi-component fiber
having a core layer of a high melting point polymer and a sheath
layer of a low melting point polymer, as needed. If such a
bi-component fiber is used, both high mechanical strength and
adhesion to the resin film can be achieved at the same time.
[0019] The polyolefin yarn is not particularly limited, and for
example, monofilament yarn, multifilament yarn, flat yarn, split
yarn and the like, may be used.
[0020] The monofilament yarn may be produced by extruding a molten
and kneaded polymer through a single hole by means of an extruder
and performing drawing and the like to form a fibrous product. For
the purpose of not only imparting strength properties to the fiber
but also imparting adhesive properties to the fiber surface,
composite monofilament yarn which is produced using a nozzle having
a concentric double discharge-hole structure, and foamed
monofilament yarn which is produced by a process of adding a
foaming agent to a molten and kneaded polymer and extruding and
spinning the polymer into fibers, can be used.
[0021] The multifilament yarn comprises a number of single fibers,
which is generally formed by extruding a molten polymer through a
spinning nozzle having a plurality of discharge ports, cooling and
solidifying the polymer, and then drawing and heating the polymer.
In some cases, false twisting and the like are performed to prevent
spreading out of single fibers.
[0022] The flat yarn may be produced by forming a film by extrusion
method and the like, slitting the film into pieces each with a
specific width, and then drawing and heating the pieces.
[0023] The split yarn may be produced by further subjecting the
flat yarn to splitting and weaving.
[0024] Particularly, the flat yarn and the split yarn are known to
have extremely high tensile strength and tear strength.
[0025] The fineness of the polyolefin yarn is not particularly
limited, but it is generally about 100 to 5000 dt.
[0026] The substrate layer comprising the woven fabric can form a
display strip having high punch hole strength, however, in some
cases, the punch hole strength should further be increased in order
that the punch hole portion should not be broken even when a
customer detaches a product-enclosed bag from the display strip
with strong force.
[0027] The inventors have found that weft yarn having fineness
thicker than that of warp yarn is preferably used in order to
achieve a punch hole strength that allows the display strip to
withstand the strong force for pulling the bag. In particular, warp
yarn preferably comprises flat yarn or split yarn having a flat
cross section and weft yarn preferably comprises monofilament yarn
or multifilament yarn which is thicker than the warp yarn and each
has a round cross section, in the woven fabric. This is supposed to
be because the cross section of the monofilament yarn or
multifilament yarn is nearly circular so that when a load is
abruptly applied, the single fibers that form the yarn can move
between the single fibers or move at intersections and the like
between the yarn and the warp yarn and the like to facilitate
absorption of the stress. The woven fabric having such a structure
has a relatively small contact area between the warp yarn and weft
yarn, and therefore, it is believed that when an impact load is
applied, contact portions between the warp yarn and the weft yarn
should be broken so that the weft yarn can move to absorb the
impact.
[0028] In contrast, in a woven fabric, wherein warp yarn comprises
flat yarn or split yarn having a flat cross section and the weft
yarn also comprises flat yarn or split yarn having a similar flat
cross section, the warp yarn can serve as a guide to promote the
destruction of the weft yarn so that the weft yarn can be broken,
when an impact load is applied. It is believed that in such a
structure, the warp yarn and the weft yarn adhere to one another at
surfaces so that when an impact load is applied, the weft yarn
itself can be tightly pressed by the warp yarn to be broken, while
the contact portions cannot be separated from one another.
[0029] The resin film which forms the laminate in the first aspect
is not particularly limited, but the resin film preferably
comprises polyester, polyolefin and the like. In particular,
polyester films are preferred because they have appropriate
stiffness and mechanical strength.
[0030] If the woven fabric has low adhesion to a polyester film,
the woven fabric and the polyester film may be laminated via a
polyolefin film.
[0031] The method of producing the laminate in the first aspect is
not particularly limited, but a method of forming a resin film
layer by extruding a polymer onto the woven fabric, a method of
dry-laminating a resin film on the woven fabric, and a method of
pressure bonding a resin film to the woven fabric, and the like can
be used. Particularly, a thermocompression bonding method which
allows the resin of a resin film to infiltrate between the warp
yarn and the weft yarn of the woven fabric and to be integrated
with the woven fabric, a method of applying an adhesive to the
woven fabric such that it infiltrates between the warp yarn and the
weft yarn of the woven fabric and then laminating the woven fabric
to a resin film, and the like are preferably used.
[0032] The laminate in the first aspect may comprise only the woven
fabric and the resin film, however, it may further comprise a layer
of paper, a nonwoven fabric, a metal foil and the like, as
needed.
[0033] The paper which comprises the laminate in the second aspect
is not particularly limited as long as it can impart preferable
hardness and form-retaining properties to the display strip, kraft
paper, thin paper and the like having a basis weight of about 30 to
300 g/m.sup.2 is generally used.
[0034] In the laminate in the second aspect, the woven fabric and
the paper are laminated via a resin layer or an adhesive. For
example, the woven fabric and the paper may be laminated via a
polyolefin resin, particularly a polyethylene resin, being extruded
and sandwiched between them, or may be pressed via a polyolefin
film, particularly a polyethylene film, being sandwiched between
them, or an appropriate adhesive may be applied to the paper, and
then the woven fabric may be laminated thereon to form the
laminate.
[0035] In the laminate in the second aspect, a nonwoven fabric in
place of the paper may be used and a layer comprised of a metal
foil and the like may be used, as needed. In the case of using the
nonwoven fabric, particularly using a long-fiber nonwoven fabric,
the nonwoven fabric has effects of increasing the punch hole
strength. While the inventors have filed a patent application on a
display strip comprising a nonwoven fabric-containing substrate
layer (PCT/JP2005/010668), the reinforcing effect is greater with
the woven fabric according to the invention than with the nonwoven
fabric.
[0036] The thickness of the substrate layer is not particularly
limited, but it is preferable to be 30 to 500 .mu.m. If it is less
than 30 .mu.m, the resulting punch hole strength can be
insufficient so that displaying or detaching product-enclosed bags
can cause breakage. If it is more than 500 .mu.m, the substrate
layer can serves as a heat insulator so that heat can
insufficiently be conducted to the sealant layer in
heat-sealing.
[0037] The sealant layer is not particularly limited as long as it
can show sufficient heat-sealability, however, for example, the
sealant layer preferably comprises a low melting point resin. The
low melting point resin is not particularly limited, but it
includes ethylene-vinyl acetate copolymers, polypropylene,
copolymers of propylene and any other olefin, low density
polyethylene, and the like.
[0038] The sealant layer may further contain a commonly used
additive such as wax, an ultraviolet blocking agent, an
antioxidant, a plasticizer, a lubricant, a pigment, and a dye, as
needed.
[0039] The sealant layer may be formed over substantially the
entire surface of the display strip of the invention, may be formed
in a striped pattern, or may be formed only at specific portions to
which products will be attached. It is preferred that the sealant
layer is formed over substantially the entire surface of the
display strip, because products can be attached to any part on the
display strip. As used herein, the term "substantially" means that
the punched portion, the peripheral portion and the like to which
no product will be attached may be excluded.
[0040] The display strip of the invention preferably has an
intermediate layer comprised of a resin between the substrate layer
and the sealant layer in order to improve the adhesion between the
substrate layer and the sealant layer or to increase the strength
of the whole of the display strip or the strength of the punch
hole. The resin which comprises the intermediate layer is not
particularly limited, but it is preferable to be polyolefin such as
polyethylene.
[0041] The form of the display strip of the invention is not
particularly limited, but it is in the form of a tape, a sheet and
the like. And at one end of the display strip of the invention, a
punch hole through which the display strip with products attached
thereto can be hung on a hook such that the products can be
displayed, is formed.
[0042] The method of producing the display strip of the invention
is not particularly limited, and a known conventional method can be
used. For example, a method of bonding the substrate layer to the
sealant layer produced by extrusion molding via an adhesive can be
used. Alternatively, the sealant layer may be formed on the
substrate layer by a coating method.
[0043] A method of laminating the sealant layer and the substrate
layer, which are each independently produced, with polyethylene and
the like being extruded and sandwiched between them, or a method of
providing a laminated film comprising the sealant layer and a
polyethylene layer and the like and laminating the substrate layer
to the laminated film on the polyethylene layer side, is preferably
used in the case of forming the intermediate layer.
[0044] Any conventional bag can be used as the bag which encloses
the product to be attached to the display strip of the invention,
however, a bag comprising at least a sealant layer and a substrate
layer is preferred. The sealant layer on the surface of the bag
preferably comprises at least one selected from the group
consisting of polypropylene, a copolymer of propylene and any other
olefin, low density polyethylene, and an ethylene-vinyl acetate
copolymer. The sealant layer on the surface of the bag also
preferably comprises a heat-sealable biaxial oriented polypropylene
(OPH) film. The term "heat-sealable biaxial oriented polypropylene
(OPH) film" means a product with heat-sealability that is generally
imparted by forming a very thin terpolymer layer comprising a resin
having heat-sealability such as a propylene-ethylene-butene
terpolymer on the surface of biaxial oriented polypropylene (OPP),
and particularly in the U.S. and Europe, it is frequently used for
bag materials.
[0045] The bag for enclosing a product and to be attached to the
display strip of the invention include, for example, a bag
comprising a biaxial oriented polypropylene (OPP) layer/a printed
layer/an adhesive layer/a polyethylene (PE) layer/an
aluminum-vapor-deposited polyethylene terephthalate (PET) layer/a
polyethylene (PE) layer/a cast polypropylene (CPP) layer; a bag
comprising a biaxial oriented polypropylene (OPP) layer/a printed
layer/a polyethylene (PE) layer/an aluminum-vapor-deposited
polyethylene terephthalate (PET) layer/a polyethylene (PE) layer/a
cast polypropylene (CPP) layer; a bag comprising a biaxial oriented
polypropylene (OPP) layer/a printed layer/an
aluminum-vapor-deposited cast polypropylene (CPP) layer; a bag
comprising a biaxial oriented polypropylene (OPP) layer/a printed
layer/a polyethylene (PE) layer/an aluminum-vapor-deposited cast
polypropylene (CPP) layer; a bag comprising a transparent
vapor-deposited biaxial oriented polyethylene terephthalate (PET)
layer/a printed layer/a cast polypropylene (CPP) layer; a bag
comprising a heat-sealable biaxial oriented polypropylene (OPH)
layer/a printed layer/a polyethylene (PE) layer/an
aluminum-vapor-deposited heat-sealable biaxial oriented
polypropylene (OPH) layer; a bag comprising a heat-sealable biaxial
oriented polypropylene (OPH) layer/a printed layer/a polyethylene
(PE) layer/an aluminum-vapor-deposited cast polypropylene (CPP)
layer; and a bag comprising a heat-sealable biaxial oriented
polypropylene (OPH) layer/a printed layer/an adhesive layer/a
polyethylene (PE) layer/an aluminum-vapor-deposited cast
polypropylene (CPP) layer.
[0046] A method of attaching the product-enclosed bag to the
display strip of the invention is not particularly limited,
however, for example, the product-enclosed bag is first placed in
such a manner that the front side of the bag is in contact with the
display strip, and then the upper portion of the bag is heat-sealed
so that the bag is bonded to the display strip. A specific number
of product-enclosed bags are bonded to the display strip, and then
each product-enclosed bag is turned upside down around the
heat-sealed portion serving as an axis, so that the front face of
each bag is reversed against the display strip. In such a state,
the display strip is hung on a hook and the like through the punch
hole formed at one end of the display strip and displayed, and
therefore, if each product-enclosed bag is pulled downward, it can
easily be detached from the display strip by a small force.
[0047] The seal strength between the bag and the display strip is
not particularly limited, but it is preferable to be 1 to 50 N/30
mm. If it is less than 1 N/30 mm, the product can fall under its
own weight, depending on the weight of the product, and if it is
more than 50 N/30 mm, the hung product-enclosed bag may not be
detached by pulling in some cases. It is more preferably 5 to 30
N/30 mm.
[0048] Using the display strip of the invention, product-enclosed
bags can be fixed thereon by heat sealing, and a large number of
products can easily be attached thereto by automation. Furthermore,
being hung through the punch hole formed at its upper portion, a
large number of products can be displayed even in a narrow space.
The punch hole has very high strength so that the display strip can
be prevented from being damaged by the weight of the products or
even when an impact is applied by detaching the product-enclosed
bag. Package assembly, which comprises the display strip of the
invention and a product-enclosed bag, the display strip and the
product-enclosed bag being bonded by heat sealing, also constitutes
the invention.
EFFECT OF THE INVENTION
[0049] According to the invention, a display strip having
sufficient punch hole strength for allowing a plurality of
product-enclosed bags to be attached thereto for the purpose of
arrangement and display, and package assembly can be provided.
BEST MODE FOR CARRYING OUT THE INVENTION
[0050] The invention is described in more detail by way of the
examples, however it is not intended that the invention be limited
to these examples.
EXAMPLE 1
[0051] A substrate layer was formed by bonding a 12 .mu.m-thick
biaxial oriented polyethylene terephthalate film to a woven fabric
of polyethylene (Meltac Cloth PE-560 dt with 8 pieces of warp yarn
and 7 pieces of weft yarn woven per one inch, manufactured by
HAGIHARA INDUSTRIES INC.) via a 10 .mu.m-thick low density
polyethylene (LDPE) film.
[0052] The obtained substrate layer and a sealant layer of a 40
M-thick cast polypropylene (CPP) film were laminated with a 10
.mu.m-thick intermediate layer of low density polyethylene (LDPE)
being extruded and sandwiched between them so that a sheet was
obtained that had the five-layer structure of PET (12 .mu.m)/LDPE
(10 .mu.m)/Meltac Cloth/LDPE (10 .mu.m)/CPP (40 .mu.m).
[0053] The obtained sheet was cut into 35 mm-wide strips, which
were each punched to have a hole with a diameter of 6 mm on the
position of 25.4 mm from the upper end, and 420 mm-long display
strips are obtained. With respect to the punch hole, the portion
was not completely removed by punching but allowed to remain in
such a manner that it was partially hung on the display strip (FIG.
2).
EXAMPLE 2
[0054] A sheet having the five-layer structure of thin paper (70
g/m.sup.2)/LDPE (10 .mu.m)/Meltac Cloth/LDPE (10 .mu.m)/CPP (40
.mu.m) was obtained in the same manner as Example 1 except that
thin paper (70 g/m.sup.2) was used in place of the 12 .mu.m-thick
biaxial oriented polyethylene terephthalate film.
[0055] The obtained sheet was cut into 35 mm-wide strips, which
were each punched to have a hole with a diameter of 6 mm on the
position of 25.4 mm from the upper end, and 420 mm-long display
strips are obtained.
EXAMPLE 3
[0056] A substrate layer was formed by bonding a 20 .mu.m-thick
biaxial oriented polypropylene (OPP) film to a Tarpee sheet (NZ1,
100 dt-8.times.5, manufactured by HAGIHARA INDUSTRIES INC.) via a
10 .mu.m-thick low density polyethylene (LDPE) film.
[0057] The obtained substrate layer and a sealant layer of a 50
.mu.m-thick ethylene-vinyl acetate copolymer (EVA) film were
laminated with a 10 .mu.m-thick intermediate layer of low density
polyethylene (LDPE) being extruded and sandwiched between them so
that a sheet was obtained that had the five-layer structure of OPP
(20 .mu.m)/LDPE (10 .mu.m)/Tarpee sheet/LDPE (10 .mu.m)/EVA (50
.mu.m).
[0058] The obtained sheet was cut into 35 mm-wide strips, which
were each punched to have a hole with a diameter of 6 mm on the
position of 25.4 mm from the upper end, and 420 mm-long display
strips are obtained.
EXAMPLE 4
[0059] A substrate layer was formed by bonding a sheet of 50
g/m.sup.2 bleached kraft paper to a woven fabric (Meltac Cloth) of
330 dt composite polyethylene flat warp yarn (8/inch) and 440 dt
composite monofilament polyethylene weft yarn (7/inch) via a 20
.mu.m-thick low density polyethylene (LDPE) film.
[0060] The obtained substrate layer and a sealant layer of a 50
.mu.m-thick ethylene-vinyl acetate copolymer (EVA) (Melthene MX06
manufactured by TOSOH CORPORATION) were laminated with 15
.mu.m-thick low density polyethylene (LDPE) being extruded and
sandwiched between them so that a sheet was obtained that had the
five-layer structure of bleached kraft paper (50 g/m.sup.2)/LDPE
(20 .mu.m)/Meltac Cloth/LDPE (15 .mu.m)/EVA (50 .mu.m).
[0061] The obtained sheet was cut into 35 mm-wide strips, which
were each punched to have a hole with a diameter of 6 mm on the
position of 25.4 mm from the upper end, and 420 mm-long display
strips are obtained.
COMPARATIVE EXAMPLE 1
[0062] A substrate layer of a 50 .mu.m-thick general-purpose
biaxial oriented polyethylene terephthalate (PET) film and a
sealant layer of a 50 .mu.m-thick cast polypropylene (CPP) film
were laminated with an intermediated layer of 30 .mu.m-thick low
density polyethylene (LDPE) being extruded and sandwiched between
them so that a sheet was obtained that had the three-layer
structure of PET (50 .mu.m)/LDPE (30 .mu.m)/CPP (50 .mu.m).
[0063] The obtained sheet was cut into 35 mm-wide strips, which
were each punched to have a hole with a diameter of 6 mm on the
position of 25.4 mm from the upper end, and 420 mm-long display
strips are obtained.
COMPARATIVE EXAMPLE 2
[0064] A substrate layer of a 50 .mu.m-thick general-purpose
biaxial oriented polypropylene (OPP) film and a sealant layer of 40
.mu.m-thick metallocene low density polyethylene (m-LLDPE) were
laminated with an intermediated layer of 30 .mu.m-thick low density
polyethylene (LDPE) being extruded and sandwiched between them so
that a sheet was obtained that had the three-layer structure of OPP
(50 .mu.m)/LDPE (30 .mu.m)/m-LLDPE (40 .mu.m).
[0065] The obtained sheet was cut into 35 mm-wide strips, which
were each punched to have a hole with a diameter of 6 mm on the
position of 25.4 mm from the upper end, and 420 mm-long display
strips are obtained.
Evaluation
[0066] The display strips produced in Examples 1 to 4 and
Comparative Examples 1 and 2 were evaluated by the methods
below.
[0067] The results are shown in Table 1.
(1) Measurement of Punch Hole Strength
[0068] An about 1 mm notch was intentionally formed at the punch
hole portion in the obtained display strip. Each display strip was
hung on a hook for hanging through the notched portion of the punch
hole and pulled downward at a rate of 300 mm/minute, and the
strength required to break the display strip was measured. The
resulting value was defined as the punch hole strength.
(2) Bag Pulling Test
[0069] Bags were attached to the obtained display strip to form
package assembly by means of Strip Bag Applicator (manufactured by
ISHIDA CO., LTD., which is disclosed in U.S. Patent Publication No.
2004/043882). The bag was firstly attached to the position of 40 mm
from the upper end of the display strip. 6 bags (size of each bag:
140 mm in width, 180 mm in length, each containing 100 g of snack
foods) were attached at a pitch of 60 mm to a single display strip.
Each bag was attached by heat sealing under the conditions of
105.degree. C. and 250 msec.
[0070] Each bag was detached from the obtained package assembly by
holding and pulling it by hand at a rate corresponding to a pulling
rate of about 2000 mm/minute. The test was performed on 10 display
strips with respect to each type, and the number of the display
strips in which the punch hole was broken in the process of
detaching the 6 bags was counted.
TABLE-US-00001 TABLE 1 Number of display strips with Punch hole
punch hole broken strength (N) (broken strips/10 strips) Example 1
45 8 Example 2 57 9 Example 3 72 8 Example 4 65 0 Comparative 7 10
Example 1 Comparative 4 10 Example 2
INDUSTRIAL APPLICABILITY
[0071] According to the invention, a display strip having
sufficient punch hole strength for allowing a plurality of
product-enclosed bags to be attached thereto for the purpose of
arrangement and display, and package assembly can be provided.
BRIEF DESCRIPTION OF DRAWINGS
[0072] FIG. 1 is a schematic view showing a strip bag display using
a display strip.
[0073] FIG. 2 is a schematic view showing the punch hole part of
the display strip produced in Examples.
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