EP0731033B1 - Snap zipper and bag with the same - Google Patents

Snap zipper and bag with the same Download PDF

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Publication number
EP0731033B1
EP0731033B1 EP96106533A EP96106533A EP0731033B1 EP 0731033 B1 EP0731033 B1 EP 0731033B1 EP 96106533 A EP96106533 A EP 96106533A EP 96106533 A EP96106533 A EP 96106533A EP 0731033 B1 EP0731033 B1 EP 0731033B1
Authority
EP
European Patent Office
Prior art keywords
snap
snap zipper
zipper
ldpe
bag
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.)
Expired - Lifetime
Application number
EP96106533A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0731033A2 (en
EP0731033A3 (enrdf_load_stackoverflow
Inventor
Toyokazu c/o. Idemitsu Petro. Co. Ltd. Takubo
Ken-ichi c/o. Idemitsu Petro. Co. Ltd. Tanaka
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 Petrochemical Co Ltd
Original Assignee
Idemitsu Petrochemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP29862592A external-priority patent/JPH06144451A/ja
Application filed by Idemitsu Petrochemical Co Ltd filed Critical Idemitsu Petrochemical Co Ltd
Publication of EP0731033A2 publication Critical patent/EP0731033A2/en
Publication of EP0731033A3 publication Critical patent/EP0731033A3/en
Application granted granted Critical
Publication of EP0731033B1 publication Critical patent/EP0731033B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C3/00—Flexible luggage; Handbags
    • A45C3/04—Shopping bags; Shopping nets
    • 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

  • This invention relates to a snap zipper and a bag with snap zipper, which can be utilized in the fields of foods, medical products and grocery.
  • Bags with zipper are used in many fields such as those of foods, medical products and grocery.
  • a strip-like snap zipper comprising a male and a female member is provided on the bag in a sealing portion thereof.
  • various methods of producing bags with snap zipper have been proposed.
  • the bag with snap zipper which is produced as a one-piece molding from the outset, takes space due to the shape of the snap zipper. Its storage and handling therefore, are rather inconvenient. In addition, restrictions are imposed on the structure of the base film. Accordingly, the latter method (2) which is free from the above drawbacks is recently becoming a general method.
  • EP-A-0371402 discloses a fastener, and a bag to which the fastener is welded, in which at least the portion of the fastener to be welded to the bag body is mainly made of ethylene vinyl acetate copolymer resin containing 1 to 9% vinyl acetate and having a melt index of 0.5 to 6.0 g/10 minutes.
  • the snap zipper is usually made of low density polyethylene (LDPE) or polypropylene (PP).
  • LDPE low density polyethylene
  • PP polypropylene
  • a sealant layer which forms the innermost layer of the bag body, and to which the snap zipper is fused, is applied to a base film of the same material.
  • LDPE low density polyethylene
  • PP polypropylene
  • the snap zipper is made of the same LDPE.
  • the snap zipper With a sealant layer of the same material as the snap zipper, the snap zipper can be sealed to the sealant layer without any trouble.
  • polyester resins are excellent in their heat resistance and odour retention property, and thus they are used suitably as the material of the sealant layer of the bag body.
  • a snap zipper which has at least its portion for fusion mainly composed of a composition comprising (1) polyester type elastomer and a polyolefin type resin or (2) polybutylene terephthalate (PBT) resin and a polyolefin type resin, wherein the content of the polyolefin type resin in the composition is 3 to 50% by weight.
  • a composition comprising (1) polyester type elastomer and a polyolefin type resin or (2) polybutylene terephthalate (PBT) resin and a polyolefin type resin, wherein the content of the polyolefin type resin in the composition is 3 to 50% by weight.
  • the portion for fusion need have the above composition.
  • the entire snap zipper including the portion for fusion may be composed of (1) polyester type elastomer and a polyolefin type resin or (2) the PBT resin and a polyolefin type resin.
  • the polyolefin type adhesion resin has a structure, in which a mixture of one or more different varieties of polyolefin are partly graft coupled to an unsaturated carboxylic acid.
  • polystyrene resin examples include low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), high density polyethylene (HDPE), ethylene-vinyl acetate copolymer (EVA), polypropylene (PP), ethylene-butene-1 copolymer, ethylene-propylene copolymer, polybutadiene (PBd), etc.
  • LDPE low density polyethylene
  • L-LDPE linear low density polyethylene
  • HDPE high density polyethylene
  • EVA ethylene-vinyl acetate copolymer
  • PP polypropylene
  • PP ethylene-butene-1 copolymer
  • PBd polybutadiene
  • the content of the polyolefin type resin in the snap zipper is 3 to 50% by weight, suitably 10 to 40% by weight. If the content is below 3% by weight, the shape retention is deteriorated. If the content is above 50% by weight, on the other hand, thermal fusion becomes difficult.
  • the snap zipper may, if necessary, contain suitable additives (such as coloring agent, stabilizing agent, anti-oxidation agent, slip agent, anti-static agent, anti-blocking agent, etc). Slip agent are added usually.
  • a bag with a snap zipper in which the snap zipper according to the first embodiment of the invention noted above is fused via the portion for fusion to a bag body.
  • the snap zipper according to the invention permits use of the polyester type resin for the bag body sealant layer, to which the snap zipper is fused.
  • the snap zipper can be fused to the sealant layer without trouble. Besides, a sufficient strength of fusion between the bag body and the snap zipper is obtainable.
  • the polyester type resin as the material of the sealant layer.
  • polyester type resin examples include polyester (PET), polybutylene terephthalate (PBT) resin, polyester type elastomer, polycarbonate, etc. It is possible to use a blend of resins composed of polyester and polyolefin type resins.
  • polyester type resins are excellent in heat resistance, odor retention and low drug absorption property, with the possibility of using this type of resins as the material of the sealant layer the following effects are obtainable.
  • the material of the bag body in order to provide the odor retention and low drug absorption property.
  • polyester type resins in lieu of aluminum.
  • the bag may be made transparent by dispensing with aluminum layer. By so doing, it is possible to obtain a bag, through which the content can be seen while it provides the odor retention and low drug absorption properties.
  • the bag which can be produced by using such polyester type resin, is suitable for fields, in which heat resistance such as boil and retort is required.
  • the material for the sealant layer may be used any resin other than the polyester type resins as well so long as it can be fused to the snap zipper.
  • resin examples include LDPE, L-LDPE, PP, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMAA), ionomer (IO), etc.
  • nylon, PET, PP, cellophane, paper, etc. may be used as desired depending on desired characteristics.
  • the snap zipper according to the invention may be fabricated by any method. Usually, it is produced using extrusion dies having sectional profiles corresponding to its shape for molding it and then cooling the resultant molding in water.
  • the shape of the snap zipper according to the invention is not limited to what comprises a male and a female member capable of chucking together, and any well-known shape may be adopted so long as it is capable of sealing and unsealing.
  • the snap zipper may be fused to the bag body with well-known means such as heat, high frequency waves, ultrasonic waves, etc.
  • a strip-like male and a strip-like female member 12 and 13 of each of snap zippers 11 in the individual examples, as shown in Figs. 1 and 2, were produced by extrusion molding using a material, which was composed of polyester type elastomer as a main material and polyolefin type resin as an auxiliary material, with an extruder, followed by water cooling.
  • the kinds and proportions of the polyolefin type resins that were used in the individual examples are as in Table 1.
  • the shape retention was evaluated such that the snap zipper 11 was B (Good) if it was satisfactory in the shape of the head portion 15 and hooks 18 and 19 and substantially free from twist in the stem portions (tape portions) 14 and 17, C (Fairly Good) if it had slight twist in the stem portions 14 and 17, and F (Fail) if it had much twist in the stem portions 14 and 17.
  • the thermal fusion performance was evaluated as follows. It was A, i.e., satisfactory, if a strength of 300 g or above with a width of 15 mm was measured by using the thermal gradient tester noted above. It was F, i.e., defective, if the strength in the same measurement was below 300 g.
  • B stands for a snap zipper, which is B or C in the shape retention and a heat seal strength of 15 mm width of 300 g or above
  • F stands for a zipper, which is C or F in the shape retention and has a heat seal strength of 15 mm width of 300 g or below.
  • the stem portions 14 and 17 of the male and female members 12 and 13 were then heat sealed to base films (70 ⁇ m thick) 23 of the bag body 22, and then the base films were heat sealed on three sides, thus obtaining the bag 21 with snap zipper in these examples.
  • the base film 23 had a three-layer structure with two inner layers, i.e., a polyester type resin layer (53 ⁇ m) and an adhesive layer (5 ⁇ m) and an outer layer, i.e., PET layer (12 ⁇ m), the innermost polyester type resin layer being a sealant layer of the bag body 22, to which the male or female 12 or 13 was fused.
  • a strip-like male and a strip-like female member of each of snap zippers in the individual examples were produced by using a material, which was composed of polybutylene terephthalate as a main material and polyolefin type resin as an auxiliary material as Examples 1 to 16. Then, by using these zippers bags with zipper in the individual Examples were produced.
  • the kinds and proportions of the polyolefin type resins that were used in the individual examples are as in Table 2.
  • these bags 24 twist snap zippers 11 have no problem in the fusion strength between the snap zippers 11 and bag body 22.
  • the bag body 24 is excellent in the sealing and unsealing of the snap zipper 11 and is satisfactory in appearance.
  • the snap zipper in Comparative Example 1 had defective shape retention because it did not contain polyolefin type resin although it contained polyester type elastomer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP96106533A 1992-11-09 1993-11-08 Snap zipper and bag with the same Expired - Lifetime EP0731033B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP298624/92 1992-11-09
JP298625/92 1992-11-09
JP29862492 1992-11-09
JP29862592A JPH06144451A (ja) 1992-11-09 1992-11-09 咬合具及び咬合具付き包装袋
EP93308892A EP0597650B1 (en) 1992-11-09 1993-11-08 Bag with a snap zipper

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP93308892A Division EP0597650B1 (en) 1992-11-09 1993-11-08 Bag with a snap zipper
EP93308892.4 Division 1993-11-08

Publications (3)

Publication Number Publication Date
EP0731033A2 EP0731033A2 (en) 1996-09-11
EP0731033A3 EP0731033A3 (enrdf_load_stackoverflow) 1996-09-25
EP0731033B1 true EP0731033B1 (en) 1999-05-06

Family

ID=26561598

Family Applications (4)

Application Number Title Priority Date Filing Date
EP96106533A Expired - Lifetime EP0731033B1 (en) 1992-11-09 1993-11-08 Snap zipper and bag with the same
EP96106556A Expired - Lifetime EP0731034B1 (en) 1992-11-09 1993-11-08 Snap zipper and bag with the same
EP96106557A Withdrawn EP0731035A2 (en) 1992-11-09 1993-11-08 Snap zipper and bag with the same
EP93308892A Expired - Lifetime EP0597650B1 (en) 1992-11-09 1993-11-08 Bag with a snap zipper

Family Applications After (3)

Application Number Title Priority Date Filing Date
EP96106556A Expired - Lifetime EP0731034B1 (en) 1992-11-09 1993-11-08 Snap zipper and bag with the same
EP96106557A Withdrawn EP0731035A2 (en) 1992-11-09 1993-11-08 Snap zipper and bag with the same
EP93308892A Expired - Lifetime EP0597650B1 (en) 1992-11-09 1993-11-08 Bag with a snap zipper

Country Status (5)

Country Link
EP (4) EP0731033B1 (enrdf_load_stackoverflow)
KR (1) KR100296391B1 (enrdf_load_stackoverflow)
AU (1) AU679004B2 (enrdf_load_stackoverflow)
DE (3) DE69316712T2 (enrdf_load_stackoverflow)
ES (1) ES2111719T3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6487758B2 (en) 2001-03-21 2002-12-03 Eaton Corporation Polypropylene recloseable zipper

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3650465B2 (ja) * 1996-04-12 2005-05-18 出光興産株式会社 咬合具及び咬合具付き包装袋
JPH10107A (ja) * 1996-06-17 1998-01-06 Idemitsu Petrochem Co Ltd 咬合具及び咬合具付き包装袋
US6719678B1 (en) 2000-02-28 2004-04-13 C.L.P Industries Ltd. Recloseable retort pouch
KR20100086488A (ko) * 2007-10-22 2010-07-30 이데미쓰 유니테크 가부시키가이샤 교합구 및 교합구 부착 포장 주머니
WO2015167405A1 (en) * 2014-04-29 2015-11-05 Oonpipat Vichanya Bag or bag cover with flexible zipper, and the production method of said flexible zipper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3247489A (en) * 1988-04-07 1989-10-12 Idemitsu Petrochemical Co., Ltd. Snap zipper, bag with snap zipper, manufacture method and apparatus for bag with snap zipper, and bagging method and apparatus for bag with snap zipper
JP2750382B2 (ja) * 1988-11-29 1998-05-13 出光石油化学株式会社 咬合具および咬合具付包装用袋
US5238306A (en) * 1989-05-19 1993-08-24 Reynolds Consumer Products, Inc. Method of producing a sealing system for a reclosable webbed-wall package, and system made
JP2716226B2 (ja) * 1989-11-28 1998-02-18 出光石油化学株式会社 咬合具および咬合具付包装用袋
US5100246A (en) * 1990-10-09 1992-03-31 Illinois Tool Works Inc. Pull bead and guide rails for easy open flexible containers
US5335995A (en) * 1993-07-16 1994-08-09 Servo Corporation Of America Resilient support for a railroad wheel heat sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6487758B2 (en) 2001-03-21 2002-12-03 Eaton Corporation Polypropylene recloseable zipper

Also Published As

Publication number Publication date
EP0597650A1 (en) 1994-05-18
EP0731033A2 (en) 1996-09-11
DE69324827T2 (de) 1999-09-16
DE69324827D1 (de) 1999-06-10
EP0731033A3 (enrdf_load_stackoverflow) 1996-09-25
KR940010950A (ko) 1994-06-20
EP0731034B1 (en) 1999-05-06
EP0731034A2 (en) 1996-09-11
DE69316712D1 (de) 1998-03-05
EP0731034A3 (enrdf_load_stackoverflow) 1996-09-18
AU679004B2 (en) 1997-06-19
ES2111719T3 (es) 1998-03-16
DE69324828T2 (de) 1999-09-16
DE69324828D1 (de) 1999-06-10
EP0731035A2 (en) 1996-09-11
AU5052893A (en) 1994-05-19
DE69316712T2 (de) 1998-05-14
KR100296391B1 (ko) 2001-10-24
EP0731035A3 (enrdf_load_stackoverflow) 1996-09-18
EP0597650B1 (en) 1998-01-28

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