US20210323732A1 - Zipper tape, and container with zipper tape - Google Patents

Zipper tape, and container with zipper tape Download PDF

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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
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Prior art keywords
zipper tape
portions
resin
base strips
polyolefin
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US17/261,671
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English (en)
Inventor
Taishiro AKAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Unitech Co Ltd
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Idemitsu Unitech Co Ltd
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Assigned to IDEMITSU UNITECH CO., LTD. reassignment IDEMITSU UNITECH CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AKAO, TAISHIRO
Publication of US20210323732A1 publication Critical patent/US20210323732A1/en
Abandoned legal-status Critical Current

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    • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Slide Fasteners (AREA)
  • Package Frames And Binding Bands (AREA)
US17/261,671 2018-07-20 2019-05-23 Zipper tape, and container with zipper tape Abandoned US20210323732A1 (en)

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JP2018136799 2018-07-20
JP2018-136799 2018-07-20
PCT/JP2019/020411 WO2020017149A1 (ja) 2018-07-20 2019-05-23 ジッパーテープ、およびジッパーテープ付き容器

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JP2539808Y2 (ja) * 1991-02-18 1997-07-02 タマポリ株式会社 ファスナーつき包装袋
JP3294043B2 (ja) * 1995-03-31 2002-06-17 出光石油化学株式会社 咬合具付き袋
JPH0937815A (ja) * 1995-07-26 1997-02-10 Idemitsu Petrochem Co Ltd 咬合具及び咬合具付き包装袋
JP3676955B2 (ja) * 1999-11-19 2005-07-27 株式会社生産日本社 合成樹脂製チャック付袋体
ATE315995T1 (de) * 2001-07-17 2006-02-15 Japan Patent Man Co Ltd Verfahren zur herstellung eines ineinandergreifenden profilleistenverschluss für einen beutel
CN1248922C (zh) * 2002-09-04 2006-04-05 东洋制袋（苏州）有限公司 棉被压缩保存袋
JP4801328B2 (ja) * 2004-06-04 2011-10-26 出光ユニテック株式会社 チャックテープ、チャックテープ付き包装袋及びチャックテープ付き包装袋の製造方法
JP4568069B2 (ja) * 2004-10-04 2010-10-27 出光ユニテック株式会社 チャック及びチャック付き袋
JP5638278B2 (ja) * 2009-10-19 2014-12-10 出光ユニテック株式会社 易裂き性ジッパーテープ、及び、易裂き性ジッパーテープ付き包装袋
JP6126457B2 (ja) * 2013-05-22 2017-05-10 株式会社細川洋行 チャック成型品
WO2015178318A1 (ja) * 2014-05-21 2015-11-26 出光ユニテック株式会社 ジッパーテープ付袋体、ジッパーテープ付袋体の物品収納方法、ジッパーテープ付袋体の製造方法、および、ジッパーテープ付袋体の製造装置

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WO2020017149A1 (ja) 2020-01-23
TW202007604A (zh) 2020-02-16
JP2023166564A (ja) 2023-11-21
JP7720696B2 (ja) 2025-08-08
JPWO2020017149A1 (ja) 2021-07-15

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