US20210323732A1 - Zipper tape, and container with zipper tape - Google Patents
Zipper tape, and container with zipper tape Download PDFInfo
- Publication number
- US20210323732A1 US20210323732A1 US17/261,671 US201917261671A US2021323732A1 US 20210323732 A1 US20210323732 A1 US 20210323732A1 US 201917261671 A US201917261671 A US 201917261671A US 2021323732 A1 US2021323732 A1 US 2021323732A1
- Authority
- US
- United States
- Prior art keywords
- zipper tape
- portions
- resin
- base strips
- polyolefin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
- B65D33/2541—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterised by the slide fastener, e.g. adapted to interlock with a sheet between the interlocking members having sections of particular shape
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/10—Slide fasteners with a one-piece interlocking member on each stringer tape
- A44B19/16—Interlocking member having uniform section throughout the length of the stringer
Definitions
- the preset invention relates to a zipper tape and a container with a zipper tape.
- inner layers being in contact with contents are made of polyolefin resin films, whose main component is polyethylene and/or polypropylene that are excellent in safety and heat sealability.
- the polyolefin resin through and into which aroma components are easily permeable and/or adsorptive, sometimes emit plastic smell when used as a material of the inner layers.
- medicinal and/or aroma components of the contents sometimes migrate into the polyolefin resin and/or are adsorbed onto the polyolefin resin, impairing the product value.
- packaging products are known in which PET (PolyEthylene Terephthalate), being resistant to cause migration and/or adsorption of the medicinal and/or aroma components of the contents, is used as the inner layers.
- Patent Literature 1 discloses a bag with a zipper tape in which an inner layer is made of PET.
- the inner layer of the bag disclosed in Patent Literature 1 is made of a heat-sealable PET, while the zipper member is made of a mixture resin of PET and polyester elastomer blended at a specific ratio, or a mixture resin of PET, polyethylene and a compatibilizer.
- the zipper member is weldable to the inner layer of the bag made of PET and flexibility is given to the zipper member to enable easy opening/closing.
- an object of the invention is to provide a zipper tape reliably weldable to a container body having an inner layer containing PET while keeping functionality such as stable sealability, moderate click feeling upon unsealing, and a container with a zipper tape in which the zipper tape is welded to a container body.
- a zipper tape includes: a first resin portion made of a resin composition whose main polymer is polyolefin, the first resin portion comprising a pair of base strips and a pair of engaging portions being engageable with each other and respectively projecting from surfaces of the pair of base strips facing with each other; and a second resin portion made of a resin composition whose main polymer is polyester, the second resin portion at least covering surfaces of the pair of base strips opposite from the engaging portions.
- the engaging portions of the zipper tape which are made of the resin composition whose main polymer is polyolefin, can maintain the functionality of the zipper tape such as stable sealability and moderate click feeling upon unsealing.
- the bonding surface which is made of the resin composition whose main polymer is polyester, allows the zipper tape to be reliably welded with a container body having a sealant layer containing PET.
- a container with a zipper tape including the above zipper tape and a container body welded with the zipper tape is provided.
- the zipper-tape container formed by welding the above zipper tape to the container body having a sealant layer containing PET can achieve both of the functionality of the PET layer and the functionality of the zipper tape.
- a zipper tape capable of being reliably welded to a container body having an inner layer containing PET while maintaining functionality of the zipper tape such as stable sealability and moderate click feeling upon unsealing can be provided, and also a container with the zipper tape welded to a container body, which thus achieves both of the functionality of the container body and the functionality of the zipper tape, can be provided.
- FIG. 1 is a plan view of a bag with a zipper tape according to a first exemplary embodiment of the invention.
- FIG. 2 is a cross sectional view of the bag with the zipper tape shown in FIG. 1 , taken along II-II lines.
- FIG. 3 is a cross-sectional view of a bag with a zipper tape according to a second exemplary embodiment of the invention.
- FIG. 4 is a cross-sectional view of a bag with a zipper tape according to a modification of the second exemplary embodiment of the invention.
- FIG. 5 is a cross-sectional view of a bag with a zipper tape according to another modification of the second exemplary embodiment of the invention.
- FIG. 6 is a cross-sectional view of a bag with a zipper tape according to a third exemplary embodiment of the invention.
- FIG. 7 is a cross-sectional view of a bag with a zipper tape according to a modification of the third exemplary embodiment.
- FIG. 8 is a cross-sectional view of a bag with a zipper tape according to a fourth exemplary embodiment of the invention.
- main polymer herein refers to a component of the largest quantity in the components of respective layers.
- the “main polymer” means a component contained at 100/n % or more, preferably at 100/n % ⁇ 1.2 or more.
- a component being the main polymer can be determined through infrared spectroscopy, NMR, DSC or the like. It should be noted inevitable impurities are optionally contained as long as an advantage of the invention is not impaired.
- FIG. 1 is a plan view of a bag with a zipper tape according to a first exemplary embodiment of the invention.
- FIG. 2 is a cross sectional view of the bag with the zipper tape shown in FIG. 1 , taken along II-II lines.
- a bag with a zipper tape 1 according to the first exemplary embodiment includes a film 10 forming a bag with a first area 11 A and a second area 11 B, and a zipper tape 20 .
- the film 10 has a single layer or multiple layers of a thermoplastic resin. More specifically, the film 10 can include a layer made of LDPE (Low-Density PolyEthylene), LLDPE (Linear Low-Density PolyEthylene), or PP (PolyPropylene). PP can be HPP (polypropylene homopolymer), RPP (polypropylene random copolymer), or BPP (polypropylene block coplymer).
- LDPE Low-Density PolyEthylene
- LLDPE Linear Low-Density PolyEthylene
- PP PolyPropylene
- HPP polypropylene homopolymer
- RPP polypropylene random copolymer
- BPP polypropylene block coplymer
- a top base material can be OPP (biaxially Oriented PolyPropylene), OPET (biaxially Oriented PolyEthylene Terephthalate), or ONy (biaxially Oriented Nylon).
- the film 10 can include an inorganic material layer formed by processes of vapor deposition of aluminum, lamination of aluminum foil, or the like.
- a sealant layer of the first area 11 A and the second area 11 B of the film 10 being a layer facing the zipper tape 20 , is made of a resin composition whose main polymer is a heat-sealable PET (PolyEthylene Terephthalate).
- the bag body having the first area 11 A and the second area 11 B is formed by bonding two sheets of the film 10 with each other at a bottom seal 12 and side seals 13 in this exemplary embodiment
- the first area 11 A and the second area 11 B are formed by folding a single sheet of film 10 at a portion corresponding to one of the side seals 13 in some embodiments of the invention.
- the film 10 is optionally interfolded at a portion(s) corresponding to the bottom seal 12 and/or the side seals 13 of the example shown in FIG. 1 , thereby forming a so-called gusset.
- the gusset is formed by the film(s) 10 or by a separate film bonded to the film(s) 10 .
- the bag with the zipper tape 1 can also be a stand up pouch capable of standing upright on the gusset formed at a bottom thereof.
- an opening 14 of the bag with the zipper tape 1 is formed by providing the bottom seal 12 and the side seals 13 and omitting a top seal in this exemplary embodiment
- the top seal can be provided in addition to the bottom seal 12 and the side seals 13 and afterward a portion between the top seal and the zipper tape 20 can be cut to form the opening 14 in some embodiments.
- the bag body is provided without the bottom seal 12 , in other words, the bag with the zipper tape 1 is not sealed at a side opposite the zipper tape 20 .
- the bottom seal 12 is provided after putting the contents into the bag with the zipper tape 1 .
- the invention is applicable not only to the above-described examples but also to various known bags and containers other than bags as long as the zipper tape is weldable thereto.
- the zipper tape 20 includes a first member 20 A welded to the first area 11 A of the film 10 and a second member 20 B welded to the second area 11 B.
- the first member 20 A and the second member 20 B respectively include a polyolefin portion 21 A and a polyolefin portion 21 B made of a resin composition whose main polymer is polyolefin, a bonding resin layer 22 A and a bonding resin layer 22 B, and a polyester portion 23 A and a polyester portion 23 B made of a resin composition whose main polymer is polyester.
- the polyolefin portions 21 A, 21 B respectively include base strips 211 A, 211 B, and engaging portions 212 A, 212 B respectively projecting from surfaces of the base strips 211 A, 211 B facing with each other.
- the polyester portions 23 A, 23 B which cover surfaces of the base strips 211 A, 211 B opposite from the engaging portions 212 A, 212 B, define bonding surfaces 231 A, 231 B bonded with the first area 11 A and the second area 11 B of the film 10 , respectively.
- the bonding resin layers 22 A, 22 B are interposed between the polyolefin portions 21 A, 21 B and the polyester portions 23 A, 23 B, respectively, to bond these portions with each other.
- the zipper tape 20 is producible by, for instance, co-extrusion of the resin materials of the portions.
- the bonding resin layers 22 A, 22 B are made of, for instance, bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and copolymer thereof, styrene bonding resin, polyester bonding resin, and olefin elastomer bonding resin.
- bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobuty
- Interlaminar bonding strength between the polyolefin portions 21 A, 21 B and the polyester portions 23 A, 23 B can be increased with the use of these bonding resin(s).
- decrease in aroma retaining property of the bag with the zipper tape 1 which is caused by pinholes created in a gap between the layers of the zipper tape 20 at the side seals 13 during or after the production of the bag with the zipper tape 1 as shown in FIG. 1 , can be prevented.
- engaging portions 212 A, 212 B formed by the polyolefin portions 21 A, 21 B are engageable with each other.
- the engaging portion 212 A having a male type cross section and the engaging portion 212 B having a female type cross section are engaged with each other to close the zipper tape 20 and seal the opening 14 of the bag with the zipper tape 1 .
- the engaging portions 212 A, 212 B are not necessarily configured in the male and female shapes.
- Various known shapes of the engaging portion of the zipper tape such as a combination of nail-shaped member(s), hook-shaped member(s), and/or block-shaped member(s) are applicable to the engaging portions 212 A, 212 B of the above example.
- the engaging portions 212 A, 212 B form deformed profiles projecting from the base strips 211 A, 211 B having substantially rectangular cross sections. It is advantageous to form the engaging portions 212 A, 212 B in the polyolefin portions 21 A, 21 B whose main polymer is polyolefin since the deformed profile as described above can be maintained to seal the opening 14 reliably when the engaging portions 212 A, 212 B are engaged with each other and moderate click feeling upon unsealing can be obtained when the engaging portions 212 A, 212 B are disengaged.
- each of the first area 11 A and the second area 11 B of the film 10 is made of the resin composition whose main polymer is heat-sealable PET
- direct welding of the polyolefin portions 21 A, 21 B forming the engaging portions 212 A, 212 B and the first area 11 A and the second area 11 B can be difficult due to low weldability between polyolefin and heat-sealable PET.
- the surfaces of the polyolefin portions 21 A, 21 B opposite from the engaging portions 212 A, 212 B are covered with the polyester portions 23 A, 23 B and the bonding surfaces 231 A, 231 B formed on the polyester portions 23 A, 23 B are welded with the first area 11 A and the second area 11 B of the film 10 , respectively.
- the polyester portions 23 A, 23 B can be stably welded on the first area 11 A and the second area 11 B due to the high weldability between polyester and heat-sealable PET.
- the polyolefin portions 21 A, 21 B and the polyester portions 23 A, 23 B can be bonded in any manner. In the exemplary embodiment, the polyolefin portions 21 A, 21 B and the polyester portions 23 A, 23 B are bonded via the bonding resin layers 22 A, 22 B.
- the engaging portions 212 A, 212 B of the zipper tape 20 being made of the resin composition whose main polymer is polyolefin allow to maintain the functionality of the zipper tape such as stable sealability and moderate click feeling upon unsealing.
- the bonding surfaces 231 A, 231 B being made of the resin composition whose main polymer is polyester allow the zipper tape 20 to be reliably welded with the first area 11 A and the second area 11 B of the film 10 whose sealant layer contains PET.
- FIG. 3 is a cross-sectional view of a bag with a zipper tape according to a second exemplary embodiment of the invention.
- a bag with a zipper tape 2 according to the second exemplary embodiment includes the film 10 and a zipper tape 40 .
- the description of the film 10 which is configured in the similar manner as in the first exemplary embodiment described above, will not be repeated hereinbelow.
- the zipper tape 40 includes a first member 40 A welded to the first area 11 A of the film 10 and a second member 40 B welded to the second area 11 B.
- the first member 40 A and the second member 40 B include a polyolefin portion 21 A and a polyolefin portion 21 B, a bonding resin layer 42 A and a bonding resin layer 42 B, and a polyester portion 43 A and a polyester portion 43 B, respectively.
- the description of the base strips 211 A, 211 B and the engaging portions 212 A, 212 B of the polyolefin portions 21 A, 21 B which are similar to those in the first exemplary embodiment described above, will not be repeated hereinbelow.
- the polyester portions 43 A, 43 B are made of the resin composition whose main polymer is polyester as in the first exemplary embodiment and cover surfaces of the base strips 211 A, 211 B opposite from the engaging portions 212 A, 212 B to define the bonding surfaces 231 A, 231 B.
- the polyester portions 43 A, 43 B of the exemplary embodiment respectively include rising portions 432 A, 432 B that cover end surfaces 213 A, 213 B of the base strips 211 A, 211 B in a width direction (top-bottom direction in FIG. 3 ) of the zipper tape 40 .
- the rising portions 432 A, 432 B are defined in the cross sections of the polyester parts 43 A, 43 B by portions rising up at the ends of the width direction.
- the rising portions 432 A, 432 B can partially cover the end surfaces 213 A, 213 B while the rising portions 432 A, 432 B entirely cover the end surfaces 213 A, 213 B in the illustrated example. Specifically, the rising portions 432 A, 432 B can cover a portion of the end surfaces 213 A, 213 B near the polyester parts 43 A, 43 B respectively.
- the bonding resin layers 42 A, 42 B are made of, for instance, bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and copolymer thereof, styrene bonding resin, polyester bonding resin, and olefin elastomer bonding resin as in the first exemplary embodiment.
- bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer,
- the bonding resin layers 42 A, 42 B are provided not only on the surfaces of the base strips 211 A, 211 B opposite from the engaging portions 212 A, 212 B but also over the end surfaces 213 A, 213 B to be interposed between the polyester portions 43 A, 43 B and the end surfaces 213 A, 213 B.
- the polyolefin resin of the polyolefin portions 21 A, 21 B can be melted to cause the end surfaces 213 A, 213 B of the base strips 211 A, 211 B to extend beyond the polyester portions to bring the polyolefin resin into contact with the resin of the sealant layer of the first area 11 A or the second area 11 B, where the polyolefin resin is not welded to the sealant layer, thereby possibly forming the pinholes.
- the end surfaces 213 A, 213 B of the base strips 211 A, 211 B are respectively covered with the rising portions 432 A, 432 B of the polyester portions 43 A, 43 B to keep the resin of the polyolefin portions 21 A, 21 B and the resin of the sealant layer of the first area 11 A and/or the second area 11 B from being contacted, thereby preventing formation of pinholes.
- the similar effect can be achieved when portions being capable of covering the end surfaces of the base strips 211 A, 211 B are formed in the polyester portions 43 A, 43 B even if the portions are not necessarily called the rising portions 432 A, 432 B.
- FIG. 4 is a cross-sectional view of a bag with a zipper tape according to a modification of the second exemplary embodiment of the invention.
- the zipper tape 40 of a bag with a zipper tape 2 A shown in FIG. 4 whose width is substantially similar to the example shown in FIG. 3 , has narrower base strips 411 A, 411 B of the polyolefin portions 41 A, 41 B.
- the widths of the base strips 411 A, 411 B are, for instance, substantially the same as the widths of the engaging portions 212 A, 212 B as in the illustrated example, or narrower than those in the example.
- the polyester portions 43 A, 43 B form slab portions 433 A, 433 B that extend outward in the width direction with respect to the end surfaces 213 A, 213 B of the base strips 411 A, 411 B.
- the slab portions 433 A, 433 B which cover the end surfaces 213 A, 213 B of the base strip 411 A, 411 B in the illustrated example, can cover only a portion of the end surfaces 213 A, 213 B in some other embodiments.
- the slab portions 433 A, 433 B can cover a portion of the end surfaces 213 A, 213 B near the polyester portions 43 A, 43 B.
- the slab portions 433 A, 433 B do not cover the end surfaces 213 A, 213 B in some other embodiments.
- inner surfaces of the first member 40 A and the second member 40 B of the zipper tape 40 are facing each other and each provided with step(s) between the base strips 411 A, 411 B and the slab portions 433 A, 433 B.
- FIG. 5 is a cross-sectional view of a bag with a zipper tape according to another modification of the second exemplary embodiment of the invention.
- the zipper tape 40 of a bag with a zipper tape 2 B shown in FIG. 5 has two pairs of polyolefin portions, namely, the polyolefin portions 41 A, 41 B and polyolefin portions 44 A, 44 B, each made of a resin composition whose main polymer is polyolefin.
- the polyolefin portions 44 A, 44 B which have the same configurations as those of the polyolefin portions 41 A, 41 B, include narrow base strips 441 A, 441 B and engaging portions 442 A, 442 B configured in the similar manner as the above-described engaging portions 212 A, 212 B.
- the polyolefin portions 41 A, 41 B and the polyolefin portions 44 A, 44 B are juxtaposed in the width direction of the zipper tape 40 to form a so-called double zipper.
- the polyester portions 43 A, 43 B includes slab portions 434 A, 434 B respectively in between the base strip 411 A and the base strip 441 A and between the base strip 411 B and the base strip 441 B in addition to the slab portions 433 A, 433 B at both ends in the width direction of the zipper tape 40 as in the example shown in FIG. 4 .
- slab portions herein refer to portions where the polyester portions 43 A, 43 B are not bonded to the polyolefin portions with regard to a thickness direction of the zipper tape 40 and the zipper tape 40 is formed by polyester portions 43 A, 43 B in a form of slab (board).
- bonding areas between the polyolefin portions 41 A, 41 B, 44 A, 44 B and the polyester portions 43 A, 43 B are minimized by the narrow base strips of the polyolefin portions 41 A, 41 B, 44 A, 44 B and the slab portions 433 A, 433 B, 434 A, 434 B, which are provided by the polyester portions 43 A, 43 B on both ends in the width direction of the zipper tape 40 and at the portions between the plurality of polyolefin portions arranged in parallel with each other in the width direction, thereby restraining the zipper tape 40 from being deformed due to warpage or the like caused at the bonded portions.
- double-zipper configuration described above with reference to FIG. 5 is applicable to other embodiments.
- two engaging portions 212 A, 212 B can be projected from each of surfaces of the base strips 411 A, 411 B facing with each other to form the double zipper.
- two pairs of engaging portions 212 A, 212 B can be projected from each of the surfaces of the base strips 211 A, 211 B facing with each other to form the double zipper.
- the double zipper can also be formed in the other exemplary embodiment(s) and modification(s) described below by providing two pairs of engaging portions projecting from each of the surfaces of the base strips facing with each other.
- three or more pairs of engaging portions can project from each of the surfaces of the base strips facing with each other.
- FIG. 6 is a cross-sectional view of a bag with a zipper tape according to a third exemplary embodiment of the invention.
- a bag with a zipper tape 3 according to the third exemplary embodiment includes the film 10 and a zipper tape 60 .
- the description of the film 10 which is configured in the similar manner as the first exemplary embodiment described above, will not be repeated hereinbelow.
- the zipper tape 60 includes a first member 60 A welded to the first area 11 A of the film 10 and a second member 60 B welded to the second area 11 B.
- the first member 60 A and the second member 60 B include a polyolefin portion 61 A and a polyolefin portion 61 B, a bonding resin layer 62 A and a bonding resin layer 62 B, and a polyester portion 63 A and a polyester portion 63 B, respectively.
- the polyolefin portions 61 A, 61 B which are made of the resin composition whose main polymer is polyolefin as in the first exemplary embodiment, respectively include base strips 611 A, 611 B, and the engaging portions 212 A, 212 B projecting from mutually opposing surfaces of the base strips 611 A, 611 B. It should be noted that the description of the engaging portions 212 A, 212 B, which are configured in the similar manner as the first exemplary embodiment described above, will not be repeated hereinbelow. As in the first exemplary embodiment, the base strips 611 A, 611 B are provided with a surface provided with the engaging portions 212 A, 212 B, respectively, and a surface opposite the engaging portions 212 A, 212 B.
- the base strips 611 A, 611 B of the present exemplary embodiment respectively include step portions 614 A, 614 B at both ends in the width direction (top-bottom direction in FIG. 6 ) of the zipper tape 60 , the step portions 614 A, 614 B being formed correspondingly to foldback portions 633 A, 633 B of the polyester portions 43 A, 43 B described below.
- the step portions 614 A, 614 B form portions of the surfaces of the base strips 611 A, 611 B on which the engaging portions 212 A, 212 B are provided.
- the polyester portions 63 A, 63 B which are made of the resin composition whose main polymer is polyester as in the second exemplary embodiment, cover the surfaces of the base strips 611 A, 611 B opposite from the engaging portions 212 A, 212 B to form the bonding surfaces 231 A, 231 B, respectively. Further, the polyester portions 63 A, 63 B respectively include rising portions 432 A, 432 B that cover the end surfaces 213 A, 213 B of the base strips 611 A, 611 B in the width direction of the zipper tape 60 . Yet further, the polyester portions 63 A, 63 B of the exemplary embodiment include the foldback portions 633 A, 633 B that cover the step portions 614 A, 614 B of the base strips 611 A, 611 B.
- the foldback portions 633 A, 633 B is defined in the cross sections of the polyester portions 63 A, 63 B by the end portions of the rising portions 432 A, 432 B rising up at the ends of the width direction, the end portions further folded back inwardly.
- the step portions 614 A, 614 B form portions of the surfaces of the base strips 611 A, 611 B on which the engaging portions 212 A, 212 B are provided.
- the foldback portions 633 A, 633 B partially cover the respective surfaces of the base strips 611 A, 611 B on which the engaging portions 212 A, 212 B are provided.
- the base strips can have substantially rectangular cross section to form flat surfaces without the step portion in some embodiments, and the foldback portions 633 A, 633 B partially can cover the flat surfaces of the base strips on which the engaging portions are provided.
- the bonding resin layers 62 A, 62 B are made of, for instance, bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and copolymer thereof, styrene bonding resin, polyester bonding resin, and olefin elastomer bonding resin as in the first exemplary embodiment.
- bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copoly
- the bonding resin layers 62 A, 62 B are provided not only on the surfaces of the base strips 611 A, 611 B opposite from the engaging portions 212 A, 212 B but also over the end surfaces 213 A, 213 B and the step portions 614 A, 614 B to be interposed between the polyester portions 63 A, 63 B and the end surfaces 213 A, 213 B and the step portions 614 A, 614 B.
- the polyolefin resin of the polyolefin portions 61 A, 61 B can be melted to flow beyond the rising portions 423 A, 432 B to bring the polyolefin resin into contact with the resin of the sealant layer of the first area 11 A or the second area 11 B.
- pinholes are possibly formed due to low weldability of the polyolefin resin with the resin of the sealant layer.
- the foldback portions 633 A, 633 B of the polyester portions 63 A, 63 B which additionally cover the surfaces of the base strips 611 A, 611 B on which the engaging portions 212 A, 212 B are provided, prevent the resin of the polyolefin portions 61 A, 61 B from contacting the resin of the sealant layer of the first area 11 A or the second area 11 B, thereby more reliably preventing the pinholes from being formed.
- FIG. 7 is a cross-sectional view of a bag with a zipper tape according to a modification of the third exemplary embodiment.
- the foldback portions 633 A, 633 B of the polyester portions 63 A, 63 B are extended to reach the roots of the engaging portions 212 A, 212 B, respectively.
- the polyester portions 63 A, 63 B partially cover the surfaces of the base strips 211 A, 211 B on which the engaging portions 212 A, 212 B are provided as in the example described above with reference to FIG. 6 since the roots of the engaging portions 212 A, 212 B are not covered with the foldback portions 633 A, 633 B.
- the step portions 614 A, 614 B are not provided in the example shown in FIG. 7 .
- the pinholes can be prevented from being formed upon providing the side seals 13 in the bag with the zipper tapes 2 , 3 .
- the bag with the zipper tape having the inner layer of the film 10 made of a resin composition containing PET exhibits excellent aroma retaining property, which can be enhanced by eliminating the pinholes. It should be noted that, even without the configuration for eliminating the pinholes as in the first exemplary embodiment, it is possible not to form prominent pinholes depending on the material and/or dimension of the polyolefin portions 21 A, 21 B. Otherwise, some pinholes can be acceptable depending on the performance required for the bag with the zipper tape 1 .
- the configuration of the second and third exemplary embodiments can be designed as desired depending on the necessity and degree for eliminating the pinholes.
- FIG. 8 is a cross-sectional view of a bag with a zipper tape according to a fourth exemplary embodiment of the invention.
- a bag with a zipper tape 4 shown in FIG. 8 includes a zipper tape 70 including first members 70 A, 70 B and polyolefin portions 71 A, 71 B, where engaging portions of the polyolefin portions 71 A, 71 B define a hermetic sealing engagement including a male member 712 A and a female member 712 B contacting in surface with each other.
- An example of the hermetic sealing engagement is disclosed in, for instance, JP H08-268445 A.
- the hermetic sealing interlock engagement by the male member 712 A and the female member 712 B of the zipper tape 70 enhances sealing performance and pressure resistance of the bag with the zipper tape 4 .
- the polyolefin portions 71 A, 71 B in the example shown in FIG. 8 which include the similar narrow base strips 411 A, 411 B as those in the examples described above with reference to FIGS. 4 and 5 , optionally include a combination of non-narrow base strip(s) and the hermetic sealing engagement as in the example described with reference to other drawings.
- Example 1 the bag with the zipper tape 1 of the first exemplary embodiment of the invention described above with reference to FIG. 2
- Example 2 the bag with the zipper tape 2 of the second exemplary embodiment described above with reference to FIG. 3
- Example 3 the bag with the zipper tape 3 of the third exemplary embodiment described above with reference to FIG. 6 ).
- the zipper tapes 20 , 40 , 60 of Examples 1 to 3 included the polyolefin portions 21 A, 21 B, 61 A, 61 B made of linear low-density polyethylene whose density was 915 kg/m 3 and melt flow rate was 4.0 g/min, bonding resin layers 22 A, 22 B, 42 A, 42 B, 62 A, 62 B made of an bonding resin in a form of a mixture of low-density polyethylene, ethylene-propylene rubber, and alicyclic resin at a ratio of 63:23:14 (unit: wt %), and polyester portions 23 A, 23 B, 43 A, 43 B, 63 A, 63 B made of crystalline polyester (6:4 mixture of Vylon SI-173 and GM-913, manufactured by TOYOBO CO., LTD.).
- the material compositions were extruded through an extruder and were subsequently water cooled to prepare the zipper tapes 20 , 40 , 60 .
- a zipper tape which had no polyester portions 23 A, 23 B but had the polyolefin portions 21 A, 21 B and the bonding resin layers 22 A, 22 B, was prepared using the same material compositions and through the same molding process as those for the zipper tape 20 of the first exemplary embodiment and was bonded to the same film 10 as that in the first exemplary embodiment to prepare a bag with a zipper tape.
- the zipper tapes of Examples 1 to 3 and Comparative were welded to a laminate film (PET #12/heat-sealable PET #20 (total thickness: 32 ⁇ m)) using a heat gradient tester (manufactured by Toyo Seiki Seisaku-sho, Ltd.) at a sealing time of 1.0 second, sealing pressure of 2.0 MPa and sealing temperature of 180 degrees C. to prepare evaluation samples.
- a digital force gauge manufactured by IMADA Co., Ltd.
- heat-sealing strength (N/15 mm) between the zipper tape and the laminate film of the evaluation samples per 15 mm width was measured. It should be noted that the tensile speed at the time of sealing strength measurement was 300 mm/min.
- instance(s) showing heat-sealing strength of 15 (N/15 mm) or more are labeled as OK, and instance(s) showing heat-sealing strength of less than 15 (N/15 mm) are labeled NG.
- Alcohol colored with an ink was hermetically enclosed in the bags with the zipper tapes of Examples 1 to 3 and Comparative to evaluate the presence of pinholes at the side seals 13 .
- Table 1 instance(s) without leakage of the colored alcohol from the side seals are labeled OK, and instance(s) showing leakage of the colored alcohol through the side seals is labeled NG.
- Example 1 is applicable depending on the necessity of preventing the formation of the pinholes and the required degree of the pinholes.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
- Package Frames And Binding Bands (AREA)
- Slide Fasteners (AREA)
Abstract
A zipper tape includes: a first resin portion made of a resin composition whose main polymer is polyolefin, the first resin portion including a base strip to define a pair of base strips and an engaging portion to define a pair of mutually engageable engaging portions, the engaging portion projecting from corresponding one of mutually facing faces of the base strips; and second resin portions made of a resin composition whose main polymer is polyester, the second resin portions at least covering faces of the base strips opposite the engaging portions.
Description
- The preset invention relates to a zipper tape and a container with a zipper tape.
- In many packaging products for foods, medical products or the like, inner layers being in contact with contents are made of polyolefin resin films, whose main component is polyethylene and/or polypropylene that are excellent in safety and heat sealability. However, the polyolefin resin, through and into which aroma components are easily permeable and/or adsorptive, sometimes emit plastic smell when used as a material of the inner layers. In addition, medicinal and/or aroma components of the contents sometimes migrate into the polyolefin resin and/or are adsorbed onto the polyolefin resin, impairing the product value. In view of the above, packaging products are known in which PET (PolyEthylene Terephthalate), being resistant to cause migration and/or adsorption of the medicinal and/or aroma components of the contents, is used as the inner layers.
- For instance,
Patent Literature 1 discloses a bag with a zipper tape in which an inner layer is made of PET. The inner layer of the bag disclosed inPatent Literature 1 is made of a heat-sealable PET, while the zipper member is made of a mixture resin of PET and polyester elastomer blended at a specific ratio, or a mixture resin of PET, polyethylene and a compatibilizer. In this way, the zipper member is weldable to the inner layer of the bag made of PET and flexibility is given to the zipper member to enable easy opening/closing. -
Patent Literature 1 JP 6309925 B - However, when the zipper member is made of the mixture resin as disclosed in
Patent Literature 1, flexibility and welding strength to PET of the zipper member, which greatly change depending on the blend ratio of the components of the mixture, are not easily balanced. More specifically, at a high ratio of PET, the flexibility of the zipper member becomes insufficient to make it difficult to open/close the zipper member. In contrast, at a low ratio of PET, the welding strength between the zipper member and the inner layer (PET) of the bag becomes insufficient. Accordingly, it is not easy to stabilize quality relating to the zipper member of the bag with the zipper tape disclosed inPatent Literature 1. - Accordingly, an object of the invention is to provide a zipper tape reliably weldable to a container body having an inner layer containing PET while keeping functionality such as stable sealability, moderate click feeling upon unsealing, and a container with a zipper tape in which the zipper tape is welded to a container body.
- According to an aspect of the invention, a zipper tape includes: a first resin portion made of a resin composition whose main polymer is polyolefin, the first resin portion comprising a pair of base strips and a pair of engaging portions being engageable with each other and respectively projecting from surfaces of the pair of base strips facing with each other; and a second resin portion made of a resin composition whose main polymer is polyester, the second resin portion at least covering surfaces of the pair of base strips opposite from the engaging portions.
- According to the above aspect of the invention, the engaging portions of the zipper tape, which are made of the resin composition whose main polymer is polyolefin, can maintain the functionality of the zipper tape such as stable sealability and moderate click feeling upon unsealing. Further, the bonding surface, which is made of the resin composition whose main polymer is polyester, allows the zipper tape to be reliably welded with a container body having a sealant layer containing PET.
- According to another aspect of the invention, a container with a zipper tape including the above zipper tape and a container body welded with the zipper tape is provided.
- For instance, the zipper-tape container formed by welding the above zipper tape to the container body having a sealant layer containing PET can achieve both of the functionality of the PET layer and the functionality of the zipper tape.
- As described above, according to the aspects of the invention, a zipper tape capable of being reliably welded to a container body having an inner layer containing PET while maintaining functionality of the zipper tape such as stable sealability and moderate click feeling upon unsealing can be provided, and also a container with the zipper tape welded to a container body, which thus achieves both of the functionality of the container body and the functionality of the zipper tape, can be provided.
-
FIG. 1 is a plan view of a bag with a zipper tape according to a first exemplary embodiment of the invention. -
FIG. 2 is a cross sectional view of the bag with the zipper tape shown inFIG. 1 , taken along II-II lines. -
FIG. 3 is a cross-sectional view of a bag with a zipper tape according to a second exemplary embodiment of the invention. -
FIG. 4 is a cross-sectional view of a bag with a zipper tape according to a modification of the second exemplary embodiment of the invention. -
FIG. 5 is a cross-sectional view of a bag with a zipper tape according to another modification of the second exemplary embodiment of the invention. -
FIG. 6 is a cross-sectional view of a bag with a zipper tape according to a third exemplary embodiment of the invention. -
FIG. 7 is a cross-sectional view of a bag with a zipper tape according to a modification of the third exemplary embodiment. -
FIG. 8 is a cross-sectional view of a bag with a zipper tape according to a fourth exemplary embodiment of the invention. - Suitable exemplary embodiments of the invention will be described in detail below with reference to the attached drawings. It should be noted that components of the same or substantially the same function(s) and structure(s) will be denoted by the same reference numerals herein and in the drawings, omitting repetition of description thereof.
- It should also be noted that the term “main polymer” herein refers to a component of the largest quantity in the components of respective layers. Specifically, when the layers are made of n (n: an integer of 2 or more) polymers, the “main polymer” means a component contained at 100/n % or more, preferably at 100/n %×1.2 or more. A component being the main polymer can be determined through infrared spectroscopy, NMR, DSC or the like. It should be noted inevitable impurities are optionally contained as long as an advantage of the invention is not impaired.
-
FIG. 1 is a plan view of a bag with a zipper tape according to a first exemplary embodiment of the invention.FIG. 2 is a cross sectional view of the bag with the zipper tape shown inFIG. 1 , taken along II-II lines. As shown inFIGS. 1 and 2 , a bag with azipper tape 1 according to the first exemplary embodiment includes afilm 10 forming a bag with afirst area 11A and a second area 11B, and azipper tape 20. - For instance, the
film 10 has a single layer or multiple layers of a thermoplastic resin. More specifically, thefilm 10 can include a layer made of LDPE (Low-Density PolyEthylene), LLDPE (Linear Low-Density PolyEthylene), or PP (PolyPropylene). PP can be HPP (polypropylene homopolymer), RPP (polypropylene random copolymer), or BPP (polypropylene block coplymer). When thefilm 10 has multiple layers, a top base material can be OPP (biaxially Oriented PolyPropylene), OPET (biaxially Oriented PolyEthylene Terephthalate), or ONy (biaxially Oriented Nylon). Further, thefilm 10 can include an inorganic material layer formed by processes of vapor deposition of aluminum, lamination of aluminum foil, or the like. In the exemplary embodiment, a sealant layer of thefirst area 11A and the second area 11B of thefilm 10, being a layer facing thezipper tape 20, is made of a resin composition whose main polymer is a heat-sealable PET (PolyEthylene Terephthalate). - It should be noted that, while the bag body having the
first area 11A and the second area 11B is formed by bonding two sheets of thefilm 10 with each other at abottom seal 12 andside seals 13 in this exemplary embodiment, thefirst area 11A and the second area 11B are formed by folding a single sheet offilm 10 at a portion corresponding to one of theside seals 13 in some embodiments of the invention. Additionally or alternatively, thefilm 10 is optionally interfolded at a portion(s) corresponding to thebottom seal 12 and/or theside seals 13 of the example shown inFIG. 1 , thereby forming a so-called gusset. In this case, the gusset is formed by the film(s) 10 or by a separate film bonded to the film(s) 10. The bag with thezipper tape 1 can also be a stand up pouch capable of standing upright on the gusset formed at a bottom thereof. - Further, while an
opening 14 of the bag with thezipper tape 1 is formed by providing thebottom seal 12 and theside seals 13 and omitting a top seal in this exemplary embodiment, the top seal can be provided in addition to thebottom seal 12 and theside seals 13 and afterward a portion between the top seal and thezipper tape 20 can be cut to form theopening 14 in some embodiments. In some other embodiments, the bag body is provided without thebottom seal 12, in other words, the bag with thezipper tape 1 is not sealed at a side opposite thezipper tape 20. In this case, thebottom seal 12 is provided after putting the contents into the bag with thezipper tape 1. The invention is applicable not only to the above-described examples but also to various known bags and containers other than bags as long as the zipper tape is weldable thereto. - As shown in
FIG. 2 , thezipper tape 20 includes afirst member 20A welded to thefirst area 11A of thefilm 10 and a second member 20B welded to the second area 11B. Thefirst member 20A and the second member 20B respectively include apolyolefin portion 21A and apolyolefin portion 21B made of a resin composition whose main polymer is polyolefin, abonding resin layer 22A and a bonding resin layer 22B, and a polyester portion 23A and a polyester portion 23B made of a resin composition whose main polymer is polyester. Thepolyolefin portions base strips 211A, 211B, andengaging portions base strips 211A, 211B facing with each other. Meanwhile, the polyester portions 23A, 23B, which cover surfaces of thebase strips 211A, 211B opposite from theengaging portions bonding surfaces first area 11A and the second area 11B of thefilm 10, respectively. Thebonding resin layers 22A, 22B are interposed between thepolyolefin portions zipper tape 20 is producible by, for instance, co-extrusion of the resin materials of the portions. - Herein, the bonding resin layers 22A, 22B are made of, for instance, bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and copolymer thereof, styrene bonding resin, polyester bonding resin, and olefin elastomer bonding resin. Interlaminar bonding strength between the
polyolefin portions zipper tape 1, which is caused by pinholes created in a gap between the layers of thezipper tape 20 at the side seals 13 during or after the production of the bag with thezipper tape 1 as shown inFIG. 1 , can be prevented. - In the
zipper tape 20 described above, engagingportions polyolefin portions FIG. 2 , the engagingportion 212A having a male type cross section and the engagingportion 212B having a female type cross section are engaged with each other to close thezipper tape 20 and seal theopening 14 of the bag with thezipper tape 1. It should be noted that the engagingportions portions portions portions polyolefin portions opening 14 reliably when the engagingportions portions - On the other hand, as in the present exemplary embodiment, when the sealant layer of each of the
first area 11A and the second area 11B of thefilm 10 is made of the resin composition whose main polymer is heat-sealable PET, direct welding of thepolyolefin portions portions first area 11A and the second area 11B can be difficult due to low weldability between polyolefin and heat-sealable PET. Accordingly, in the present exemplary embodiment, the surfaces of thepolyolefin portions portions first area 11A and the second area 11B of thefilm 10, respectively. The polyester portions 23A, 23B can be stably welded on thefirst area 11A and the second area 11B due to the high weldability between polyester and heat-sealable PET. Thepolyolefin portions polyolefin portions - According to the above-described first exemplary embodiment of the invention, the engaging
portions zipper tape 20 being made of the resin composition whose main polymer is polyolefin allow to maintain the functionality of the zipper tape such as stable sealability and moderate click feeling upon unsealing. Further, the bonding surfaces 231A, 231B being made of the resin composition whose main polymer is polyester allow thezipper tape 20 to be reliably welded with thefirst area 11A and the second area 11B of thefilm 10 whose sealant layer contains PET. -
FIG. 3 is a cross-sectional view of a bag with a zipper tape according to a second exemplary embodiment of the invention. As shown inFIG. 3 , a bag with azipper tape 2 according to the second exemplary embodiment includes thefilm 10 and azipper tape 40. It should be noted that the description of thefilm 10, which is configured in the similar manner as in the first exemplary embodiment described above, will not be repeated hereinbelow. - As shown in
FIG. 3 , thezipper tape 40 includes afirst member 40A welded to thefirst area 11A of thefilm 10 and asecond member 40B welded to the second area 11B. Thefirst member 40A and thesecond member 40B include apolyolefin portion 21A and apolyolefin portion 21B, abonding resin layer 42A and abonding resin layer 42B, and apolyester portion 43A and a polyester portion 43B, respectively. It should be noted that the description of the base strips 211A, 211B and the engagingportions polyolefin portions - The
polyester portions 43A, 43B are made of the resin composition whose main polymer is polyester as in the first exemplary embodiment and cover surfaces of the base strips 211A, 211B opposite from the engagingportions polyester portions 43A, 43B of the exemplary embodiment respectively include risingportions 432A, 432B that cover end surfaces 213A, 213B of the base strips 211A, 211B in a width direction (top-bottom direction inFIG. 3 ) of thezipper tape 40. The risingportions 432A, 432B are defined in the cross sections of thepolyester parts 43A, 43B by portions rising up at the ends of the width direction. The risingportions 432A, 432B can partially cover the end surfaces 213A, 213B while the risingportions 432A, 432B entirely cover the end surfaces 213A, 213B in the illustrated example. Specifically, the risingportions 432A, 432B can cover a portion of the end surfaces 213A, 213B near thepolyester parts 43A, 43B respectively. - The bonding resin layers 42A, 42B are made of, for instance, bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and copolymer thereof, styrene bonding resin, polyester bonding resin, and olefin elastomer bonding resin as in the first exemplary embodiment. Further, the bonding resin layers 42A, 42B are provided not only on the surfaces of the base strips 211A, 211B opposite from the engaging
portions polyester portions 43A, 43B and the end surfaces 213A, 213B. - In the exemplary embodiment, the similar advantageous effects as those in the first exemplary embodiment described above. Further, pinholes are eliminated in the side seals 13 (see
FIG. 1 ), where thefirst member 40A and thesecond member 40B of thezipper tape 40 are bonded with each other on thefirst area 11A and the second area 11B of thefilm 10 since thepolyester portions 43A, 43B cover the end surfaces 213A, 213B of the base strips 211A, 211B in the width direction. - More specifically, for instance, during the process providing the side seals 13 by welding the polyolefin resin of the
polyolefin portions first area 11A or the second area 11B, where the polyolefin resin is not welded to the sealant layer, thereby possibly forming the pinholes. In the exemplary embodiment, the end surfaces 213A, 213B of the base strips 211A, 211B are respectively covered with the risingportions 432A, 432B of thepolyester portions 43A, 43B to keep the resin of thepolyolefin portions first area 11A and/or the second area 11B from being contacted, thereby preventing formation of pinholes. It should be noted that the similar effect can be achieved when portions being capable of covering the end surfaces of the base strips 211A, 211B are formed in thepolyester portions 43A, 43B even if the portions are not necessarily called the risingportions 432A, 432B. -
FIG. 4 is a cross-sectional view of a bag with a zipper tape according to a modification of the second exemplary embodiment of the invention. Thezipper tape 40 of a bag with azipper tape 2A shown inFIG. 4 , whose width is substantially similar to the example shown inFIG. 3 , has narrower base strips 411A, 411B of thepolyolefin portions 41A, 41B. The widths of the base strips 411A, 411B are, for instance, substantially the same as the widths of the engagingportions polyester portions 43A, 43Bform slab portions 433A, 433B that extend outward in the width direction with respect to the end surfaces 213A, 213B of the base strips 411A, 411B. - It should be noted that the
slab portions 433A, 433B, which cover the end surfaces 213A, 213B of thebase strip slab portions 433A, 433B can cover a portion of the end surfaces 213A, 213B near thepolyester portions 43A, 43B. Alternatively, theslab portions 433A, 433B do not cover the end surfaces 213A, 213B in some other embodiments. In this case, inner surfaces of thefirst member 40A and thesecond member 40B of thezipper tape 40 are facing each other and each provided with step(s) between the base strips 411A, 411B and theslab portions 433A, 433B. -
FIG. 5 is a cross-sectional view of a bag with a zipper tape according to another modification of the second exemplary embodiment of the invention. Thezipper tape 40 of a bag with a zipper tape 2B shown inFIG. 5 has two pairs of polyolefin portions, namely, thepolyolefin portions 41A, 41B and polyolefin portions 44A, 44B, each made of a resin composition whose main polymer is polyolefin. The polyolefin portions 44A, 44B, which have the same configurations as those of thepolyolefin portions 41A, 41B, include narrow base strips 441A, 441B and engagingportions 442A, 442B configured in the similar manner as the above-describedengaging portions polyolefin portions 41A, 41B and the polyolefin portions 44A, 44B are juxtaposed in the width direction of thezipper tape 40 to form a so-called double zipper. - In the illustrated example, since the base strips 411A, 411B, 441A, 441B of the
polyolefin portions 41A, 41B, 44A, 44B are narrow, thepolyester portions 43A, 43B includes slab portions 434A, 434B respectively in between thebase strip 411A and thebase strip 441A and between thebase strip 411B and thebase strip 441B in addition to theslab portions 433A, 433B at both ends in the width direction of thezipper tape 40 as in the example shown inFIG. 4 . It should be noted that the slab portions (theslab portions 433A, 433B and the slab portions 434A, 434B) herein refer to portions where thepolyester portions 43A, 43B are not bonded to the polyolefin portions with regard to a thickness direction of thezipper tape 40 and thezipper tape 40 is formed bypolyester portions 43A, 43B in a form of slab (board). - In the examples as illustrated in
FIGS. 4 and 5 , bonding areas between thepolyolefin portions 41A, 41B, 44A, 44B and thepolyester portions 43A, 43B are minimized by the narrow base strips of thepolyolefin portions 41A, 41B, 44A, 44B and theslab portions 433A, 433B, 434A, 434B, which are provided by thepolyester portions 43A, 43B on both ends in the width direction of thezipper tape 40 and at the portions between the plurality of polyolefin portions arranged in parallel with each other in the width direction, thereby restraining thezipper tape 40 from being deformed due to warpage or the like caused at the bonded portions. - It should be noted that the double-zipper configuration described above with reference to
FIG. 5 is applicable to other embodiments. For instance, in the example shown inFIG. 4 , two engagingportions FIGS. 2 and 3 , two pairs of engagingportions -
FIG. 6 is a cross-sectional view of a bag with a zipper tape according to a third exemplary embodiment of the invention. As shown inFIG. 6 , a bag with azipper tape 3 according to the third exemplary embodiment includes thefilm 10 and azipper tape 60. It should be noted that the description of thefilm 10, which is configured in the similar manner as the first exemplary embodiment described above, will not be repeated hereinbelow. - As shown in
FIG. 6 , thezipper tape 60 includes a first member 60A welded to thefirst area 11A of thefilm 10 and asecond member 60B welded to the second area 11B. The first member 60A and thesecond member 60B include apolyolefin portion 61A and a polyolefin portion 61B, abonding resin layer 62A and abonding resin layer 62B, and apolyester portion 63A and apolyester portion 63B, respectively. - The
polyolefin portions 61A, 61B, which are made of the resin composition whose main polymer is polyolefin as in the first exemplary embodiment, respectively include base strips 611A, 611B, and the engagingportions portions portions portions FIG. 6 ) of thezipper tape 60, the step portions 614A, 614B being formed correspondingly tofoldback portions polyester portions 43A, 43B described below. In the exemplary embodiment, the step portions 614A, 614B form portions of the surfaces of the base strips 611A, 611B on which the engagingportions - The
polyester portions portions polyester portions portions 432A, 432B that cover the end surfaces 213A, 213B of the base strips 611A, 611B in the width direction of thezipper tape 60. Yet further, thepolyester portions foldback portions foldback portions polyester portions portions 432A, 432B rising up at the ends of the width direction, the end portions further folded back inwardly. As described above, in the exemplary embodiment, the step portions 614A, 614B form portions of the surfaces of the base strips 611A, 611B on which the engagingportions foldback portions portions foldback portions - The bonding resin layers 62A, 62B are made of, for instance, bonding resin material(s) such as polyethylene, acid-modified polyolefin, epoxy-group-containing-monomer-ethylene copolymer, copolymer of ethylene-(meth)acrylic ester and dicarboxylic anhydride monomer, ethylene-vinyl-acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and copolymer thereof, styrene bonding resin, polyester bonding resin, and olefin elastomer bonding resin as in the first exemplary embodiment. Further, the bonding resin layers 62A, 62B are provided not only on the surfaces of the base strips 611A, 611B opposite from the engaging
portions polyester portions - In the exemplary embodiment, in addition to the similar advantageous effects as those in the second exemplary embodiment described above, formation of pinholes is more reliably prevented in the side seals 13 (see
FIG. 1 ), where the first member 60A and thesecond member 60B of thezipper tape 60 are bonded with each other on thefirst area 11A and the second area 11B of thefilm 10 since thepolyester portions portions polyolefin portions 61A, 61B can be melted to flow beyond the rising portions 423A, 432B to bring the polyolefin resin into contact with the resin of the sealant layer of thefirst area 11A or the second area 11B. In this case, pinholes are possibly formed due to low weldability of the polyolefin resin with the resin of the sealant layer. In the present exemplary embodiment, thefoldback portions polyester portions portions polyolefin portions 61A, 61B from contacting the resin of the sealant layer of thefirst area 11A or the second area 11B, thereby more reliably preventing the pinholes from being formed. It should be noted that the similar effect can be achieved when portions being capable of partially covering the surfaces of the base strips 211A, 211B on which the engagingportions polyester portions foldback portions - Modifications
-
FIG. 7 is a cross-sectional view of a bag with a zipper tape according to a modification of the third exemplary embodiment. In a bag with azipper tape 3A shown inFIG. 7 , thefoldback portions polyester portions portions polyester portions portions FIG. 6 since the roots of the engagingportions foldback portions FIG. 7 . - In the second and third exemplary embodiments, the pinholes can be prevented from being formed upon providing the side seals 13 in the bag with the
zipper tapes film 10 made of a resin composition containing PET exhibits excellent aroma retaining property, which can be enhanced by eliminating the pinholes. It should be noted that, even without the configuration for eliminating the pinholes as in the first exemplary embodiment, it is possible not to form prominent pinholes depending on the material and/or dimension of thepolyolefin portions zipper tape 1. For the similar reasons, the configuration of the second and third exemplary embodiments can be designed as desired depending on the necessity and degree for eliminating the pinholes. -
FIG. 8 is a cross-sectional view of a bag with a zipper tape according to a fourth exemplary embodiment of the invention. A bag with a zipper tape 4 shown inFIG. 8 includes azipper tape 70 includingfirst members 70A, 70B andpolyolefin portions 71A, 71B, where engaging portions of thepolyolefin portions 71A, 71B define a hermetic sealing engagement including amale member 712A and a female member 712B contacting in surface with each other. An example of the hermetic sealing engagement is disclosed in, for instance, JP H08-268445 A. In the exemplary embodiment, the hermetic sealing interlock engagement by themale member 712A and the female member 712B of thezipper tape 70 enhances sealing performance and pressure resistance of the bag with the zipper tape 4. It should be noted that thepolyolefin portions 71A, 71B in the example shown inFIG. 8 , which include the similar narrow base strips 411A, 411B as those in the examples described above with reference toFIGS. 4 and 5 , optionally include a combination of non-narrow base strip(s) and the hermetic sealing engagement as in the example described with reference to other drawings. - The heat sealability of the
zipper tapes zipper tapes zipper tape 1 of the first exemplary embodiment of the invention described above with reference toFIG. 2 ), Example 2 (the bag with thezipper tape 2 of the second exemplary embodiment described above with reference toFIG. 3 ), and Example 3 (the bag with thezipper tape 3 of the third exemplary embodiment described above with reference toFIG. 6 ). - The
zipper tapes polyolefin portions polyester portions zipper tapes - As Comparative, a zipper tape, which had no polyester portions 23A, 23B but had the
polyolefin portions zipper tape 20 of the first exemplary embodiment and was bonded to thesame film 10 as that in the first exemplary embodiment to prepare a bag with a zipper tape. - Evaluation results of the heat sealability and the presence of the pinholes in Examples 1 to 3 and Comparative are shown in Table 1. The details of the evaluation test are as follows.
- The zipper tapes of Examples 1 to 3 and Comparative were welded to a laminate film (
PET # 12/heat-sealable PET #20 (total thickness: 32 μm)) using a heat gradient tester (manufactured by Toyo Seiki Seisaku-sho, Ltd.) at a sealing time of 1.0 second, sealing pressure of 2.0 MPa and sealing temperature of 180 degrees C. to prepare evaluation samples. Using a digital force gauge (manufactured by IMADA Co., Ltd.), heat-sealing strength (N/15 mm) between the zipper tape and the laminate film of the evaluation samples per 15 mm width was measured. It should be noted that the tensile speed at the time of sealing strength measurement was 300 mm/min. In Table 1, instance(s) showing heat-sealing strength of 15 (N/15 mm) or more are labeled as OK, and instance(s) showing heat-sealing strength of less than 15 (N/15 mm) are labeled NG. - Alcohol colored with an ink was hermetically enclosed in the bags with the zipper tapes of Examples 1 to 3 and Comparative to evaluate the presence of pinholes at the side seals 13. In Table 1, instance(s) without leakage of the colored alcohol from the side seals are labeled OK, and instance(s) showing leakage of the colored alcohol through the side seals is labeled NG.
-
TABLE 1 Evaluation Results of Examples and Comparative Heat-Sealability Presence of Pinholes Example 1 OK NG Example 2 OK OK Example 3 OK OK Comparative NG NG - It was shown by the above Examples and Comparative that the zipper tapes of the exemplary embodiments of the invention exhibit improved heat sealability to a sealant layer made of a resin composition whose main polymer is heat-sealable PET. The pinholes at the side seals are less improved in Example 1 than in Examples 2 and 3. However, as described above, Example 1 is applicable depending on the necessity of preventing the formation of the pinholes and the required degree of the pinholes.
- Suitable exemplary embodiments of the invention have been detailed above with reference to the attached drawings. However, the scope of the invention is not limited by these exemplary embodiments. It would be obvious for those skilled in the art to which the invention pertains that various modifications and revisions are conceivable within the technical idea described within claims, and it is understood that such modifications and revisions are naturally within the technical scope of the invention.
-
-
- 1, 2, 3 . . . bag with zipper tape, 10 . . . film, 11A . . . first area, 11B . . . second area, 12 . . . bottom seal, 13 . . . side seal, 14 . . . opening, 20, 40, 60 . . . zipper tape, 20A, 40A, 60A . . . first member, 20B, 40B, 60B . . . second member, 21A, 21B, 61A, 61B . . . polyolefin portion, 211A, 211B, 611A, 611B . . . base strip, 212A, 212B . . . engaging portion, 22A, 22B, 42A, 42B, 62A, 62B . . . bonding resin layer, 23A, 23B, 43A, 43B, 63A, 63B . . . polyester portion, 231A, 231B . . . bonding surface.
Claims (10)
1. A zipper tape comprising:
a first resin portion made of a resin composition whose main polymer is polyolefin, the first resin portion comprising a pair of base strips and a pair of engaging portions being engageable with each other and respectively projecting from surfaces of the pair of base strips facing with each other; and
a second resin portion made of a resin composition whose main polymer is polyester, the second resin portion at least covering surfaces of the pair of base strips opposite from the engaging portions.
2. The zipper tape according to claim 1 , further comprising a bonding resin layer provided between the first resin portion and the second resin portion.
3. The zipper tape according to claim 1 or 2 , wherein the second resin portion at least partially covers an end surface of at least one of the base strips in a width direction of the zipper tape.
4. The zipper tape according to claim 3 , wherein the second resin portion further covers a portion of the surfaces of the base strips provided with the engaging portions, the portion being continuous with the end surface of the at least one of the base strips in the width direction of the zipper tape.
5. The zipper tape according to any one of claims 1 to 4 , wherein the second resin portion forms a slab portion extending outwardly in the width direction of the zipper tape with respect to the end surface of the at least one of the base strips.
6. The zipper tape according to any one of claims 1 to 5 , wherein the first resin portion comprises a plurality of resin portions arranged in parallel with each other in the width direction of the zipper tape, and
the second resin portion forms the slab portion between the plurality of resin portions.
7. The zipper tape according to any one of claims 1 to 6 , wherein the engaging portions comprise a male member and a female member contacting in surface with each other to form a hermetic sealing engagement.
8. A container with a zipper tape comprising:
a zipper tape according to any one of claims 1 to 7 ; and
a container body welded with the zipper tape.
9. The container with the zipper tape according to claim 8 , wherein a layer of the container body facing with the zipper tape is made of a resin composition whose main polymer is heat-sealable PET.
10. The container with the zipper tape according to claim 8 or 9 , wherein the container body forms a bag body.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018-136799 | 2018-07-20 | ||
JP2018136799 | 2018-07-20 | ||
PCT/JP2019/020411 WO2020017149A1 (en) | 2018-07-20 | 2019-05-23 | Zipper tape, and container with zipper tape |
Publications (1)
Publication Number | Publication Date |
---|---|
US20210323732A1 true US20210323732A1 (en) | 2021-10-21 |
Family
ID=69163511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/261,671 Abandoned US20210323732A1 (en) | 2018-07-20 | 2019-05-23 | Zipper tape, and container with zipper tape |
Country Status (4)
Country | Link |
---|---|
US (1) | US20210323732A1 (en) |
JP (2) | JPWO2020017149A1 (en) |
TW (1) | TWI808179B (en) |
WO (1) | WO2020017149A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2539808Y2 (en) * | 1991-02-18 | 1997-07-02 | タマポリ株式会社 | Zippered packaging bag |
JP3294043B2 (en) * | 1995-03-31 | 2002-06-17 | 出光石油化学株式会社 | Articulated bag |
JPH0937815A (en) * | 1995-07-26 | 1997-02-10 | Idemitsu Petrochem Co Ltd | Engaging element and packaging bag with engaging element |
JP3676955B2 (en) * | 1999-11-19 | 2005-07-27 | 株式会社生産日本社 | Synthetic plastic bag with zipper |
DE60208760T2 (en) * | 2001-07-17 | 2006-07-20 | Japan Patent Management Co. Ltd. | Method for producing an interlocking profiled strip closure for a bag |
CN1248922C (en) * | 2002-09-04 | 2006-04-05 | 东洋制袋(苏州)有限公司 | Compressed bag for cotton quilt |
JP4801328B2 (en) * | 2004-06-04 | 2011-10-26 | 出光ユニテック株式会社 | CHUCK TAPE, PACKAGING BAG WITH CHUCK TAPE, AND METHOD FOR MANUFACTURING PACKAGING BAG WITH CHUCK TAPE |
JP4568069B2 (en) * | 2004-10-04 | 2010-10-27 | 出光ユニテック株式会社 | Chuck and bag with chuck |
JP5638278B2 (en) * | 2009-10-19 | 2014-12-10 | 出光ユニテック株式会社 | Easy tear zipper tape and packaging bag with easy tear zipper tape |
JP6126457B2 (en) * | 2013-05-22 | 2017-05-10 | 株式会社細川洋行 | Chuck molded product |
WO2015178318A1 (en) * | 2014-05-21 | 2015-11-26 | 出光ユニテック株式会社 | Zipper tape-equipped bag body, article housing method for zipper tape-equipped bag body, manufacturing method for zipper tape-equipped bag body, and manufacturing device for zipper tape-equipped bag body |
-
2019
- 2019-05-23 US US17/261,671 patent/US20210323732A1/en not_active Abandoned
- 2019-05-23 JP JP2020530913A patent/JPWO2020017149A1/en active Pending
- 2019-05-23 WO PCT/JP2019/020411 patent/WO2020017149A1/en active Application Filing
- 2019-05-23 TW TW108117811A patent/TWI808179B/en active
-
2023
- 2023-09-14 JP JP2023149233A patent/JP2023166564A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPWO2020017149A1 (en) | 2021-07-15 |
JP2023166564A (en) | 2023-11-21 |
TWI808179B (en) | 2023-07-11 |
TW202007604A (en) | 2020-02-16 |
WO2020017149A1 (en) | 2020-01-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8011831B2 (en) | Zipper tape, packing bag with zipper tape and apparatus for producing packing bag with zipper tape | |
US8066434B2 (en) | Chuck tape with cut tape, its manufacturing method, and packaging bag with chuck tape | |
US8440293B2 (en) | Laminated tape, package, and process for producing laminated tape | |
JP4614962B2 (en) | Reclosable bag with tampa evidence structure and how to make it | |
US6244748B1 (en) | Plastic package with fastener | |
US20080031552A1 (en) | Chuck Tape and Packaging Bag with Chuck Tape | |
US8133560B2 (en) | Multilayer heat sealant structures, packages and methods of making the same | |
US9694943B2 (en) | Zipper tape with cut tape, and packaging bag provided with zipper tape with cut tape | |
US10450106B2 (en) | Bag with zipper tape and method for producing same | |
EP2330047B1 (en) | Zipper tape and packaging bag with zipper tape | |
WO2006041057A1 (en) | Packaging bag with chuck tape | |
IE54297B1 (en) | Plastics film and bags and sacks therefrom | |
US20030179955A1 (en) | Reclosable polymeric bags with tamper evident features | |
EP2119561A1 (en) | Multilayer tape, its manufacturing method, and packaging bag | |
US20210323732A1 (en) | Zipper tape, and container with zipper tape | |
TW202106575A (en) | Zipper tape and container equipped with zipper tape | |
US20100226599A1 (en) | Fastener Tape and Packaging Bag with Fastener Tape | |
US20230065515A1 (en) | Zipper tape, bag provided with zipper tape, and method for manufacturing bag provided with zipper tape | |
JP7416615B2 (en) | Bag with zipper tape and manufacturing method thereof | |
JP4521807B2 (en) | Heat-sealable composite film | |
JP2004223728A (en) | Laminate and packaging container using the same | |
EP1524107A1 (en) | Laminated packaging sheet | |
CN111050590A (en) | Fixing belt | |
JP2022116864A (en) | Tape and container with tape |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: IDEMITSU UNITECH CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AKAO, TAISHIRO;REEL/FRAME:054966/0676 Effective date: 20201228 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |