EP2535288A1 - Bande de fermeture à glissière et sac d'emballage doté d'une bande de fermeture à glissière - Google Patents

Bande de fermeture à glissière et sac d'emballage doté d'une bande de fermeture à glissière Download PDF

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Publication number
EP2535288A1
EP2535288A1 EP11742259A EP11742259A EP2535288A1 EP 2535288 A1 EP2535288 A1 EP 2535288A1 EP 11742259 A EP11742259 A EP 11742259A EP 11742259 A EP11742259 A EP 11742259A EP 2535288 A1 EP2535288 A1 EP 2535288A1
Authority
EP
European Patent Office
Prior art keywords
base
seal
bag body
zipper tape
belt
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.)
Withdrawn
Application number
EP11742259A
Other languages
German (de)
English (en)
Other versions
EP2535288A4 (fr
Inventor
Tomohiko Tamaoki
Shuichi Goto
Michio Mogami
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
Original Assignee
Idemitsu Unitech 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
Application filed by Idemitsu Unitech Co Ltd filed Critical Idemitsu Unitech Co Ltd
Publication of EP2535288A1 publication Critical patent/EP2535288A1/fr
Publication of EP2535288A4 publication Critical patent/EP2535288A4/fr
Withdrawn legal-status Critical Current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
    • 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
    • B65D33/2516—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 comprising tamper-indicating means, e.g. located within the fastener
    • B65D33/2525—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 comprising tamper-indicating means, e.g. located within the fastener located between the fastener and the product compartment
    • 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
    • B65D33/2516—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 comprising tamper-indicating means, e.g. located within the fastener
    • B65D33/2533—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 comprising tamper-indicating means, e.g. located within the fastener the slide fastener being located between the product compartment and the tamper indicating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/45—Separable-fastener or required component thereof [e.g., projection and cavity to complete interlock]
    • Y10T24/45152—Each mating member having similarly shaped, sized, and operated interlocking or intermeshable face
    • Y10T24/45157—Zipper-type [e.g., slider]
    • Y10T24/45168—Zipper-type [e.g., slider] for container [e.g., bag]

Definitions

  • the present invention relates to a zipper tape and a packaging bag provided with the zipper tape.
  • a packaging bag with a zipper tape (hereinafter, occasionally abbreviated as a packaging bag) provided by bonding the zipper tape to an inner surface of the bag body.
  • a packaging bag When such a packaging bag is filled with powdery substances and liquids as contents, the contents may leak toward a top seal beyond the zipper tape during transportation.
  • a zipper tape with a separating structure provided between the zipper tape and the contents and a packaging bag with the zipper tape have been known for preventing leakage of the contents (see, for instance, Patent Literatures I to 3).
  • the separating structure provided in the zipper tape is exemplified by a cut portion, a part of which can be easily cut, and a seal that is easily peelable from an inner surface of a bag body. In opening the packaging bag, the cut portion is cut or peeled to take out the contents.
  • Patent Literature 1 discloses a packaging bag including a wide seal base provided to a belt-like base of a male member near the contents.
  • the seal base includes a linear cut portion.
  • the packaging bag is sealed by the linear cut portion being bonded to an end of a belt-like base of a female member.
  • the linear cut portion is cut by a force in opening the zipper tape, thereby opening the packaging bag.
  • Patent Literature 2 (e.g., Fig. 10 ) discloses that a thin and linear cut portion is provided in a belt-like base of a male member near the contents and the cut portion is cut to open a packaging bag.
  • Patent Literature 3 discloses that a connecting portion is provided as a cut portion by connecting ends of non-opening-side-flanges of a male member and a female member of a joint to each other and the connecting portion is cut to open the packaging bag. Patent Literature 3 also discloses that a protrusion having a triangular cross section is formed on each of the ends of the male member and the female member, thereby allowing a stress to concentrate on the cut portion.
  • Patent Literatures 1 and 2 since the cut portion is linearly formed, when sealing the belt-like bases or the seal base of the male and the female members to the inner surface of the bag body, it is difficult to position the seal base and the cut portion at a right place. Accordingly, the cut portion may be directly bonded to the inner surface of the bag body, or the belt-like base and the seal base may be bonded to each other. In such a case, cuttability of the cut portion may be impaired. In such a structure as disclosed in Patent Literature 3, unless at least one of the protrusions is fixed to a bag body film, a sufficient force cannot be applied on the cut portion to open the bag. Accordingly, it may be difficult to cut the cut portion.
  • An object of the invention is to provide an easily openable and favorably sealable zipper tape and a packaging bag with the zipper tape.
  • a zipper tape includes: a pair of a male member and a female member including: an engagement portion that is engageable and disengageable and defines a containing space inside a bag body; and belt-like bases that are continuously connected to the engagement portion and are bondable to an inner surface of the bag body, in which a first one of the belt-like bases includes: a thick portion that is formed thicker than the first one of the belt-like bases at an end near the containing space; a cut portion that is continuously connected to the end of the thick portion near the containing space and is formed thinner than the first one of the belt-like bases; and a seal base that is continuously connected to an end of the cut portion near the containing space, formed thicker than the first one of the belt-like bases, and attached to the inner surface of the bag body to which a second one of the belt-like bases is attached, in which the thick portion is attached to the inner surface of the bag body to which the second one of the belt-like bases is attached by a strength lower than a strength for
  • the thick portion and the seal base are formed substantially in the same thickness.
  • the thick portion is formed narrower toward the inner surface of the bag body.
  • a surface of the thick portion and a surface of the seal base which face each other across the cut portion are substantially parallel to each other and are substantially orthogonal to the inner surface of the bag body to which the thick portion and the seal base are attached.
  • a packaging bag with a zipper tape includes: a bag body having an opening portion for defining a containing space; and the zipper tape according to any one of claims I to 4, the zipper tape being provided on an inner surface of the bag body.
  • the substantially hermetically sealed area works as a pressure buffer area. Accordingly, even if the cut portion is configured to be easily cut in opening, the cut portion can be prevented from being stretched by external pressure or internal pressure of the bag to impair sealability for separating the containing space from the outside, particularly water-tightness. Consequently, both a favorable openability and a sufficient sealability can be obtained.
  • a packaging bag with a zipper tape according to a first exemplary embodiment of the invention (hereinafter, occasionally referred to simply as "a packaging bag") will be described with reference to drawings.
  • the packaging bag of the invention is suitably filled with liquids as contents.
  • the packaging bag may be filled with powders, solids or gel.
  • a thick portion, a cut portion and a seal base are exemplarily provided to a female member, the thick portion, the cut portion and the seal base may be provided to a male member.
  • a packaging bag 1 of this exemplary embodiment includes a bag body 10 provided by laying base films 11 (packing material) one on the other and forming side seal bases 12 and a top seal base 13 on the periphery of the base films.
  • a zipper tape 20 includes a pair of a male member 21 and a female member 22 including an engagement portion 23.
  • the male member 21 includes a male belt-like portion 211.
  • the female member 22 includes a female belt-like portion 221.
  • the male belt-like portion 211 and the female belt-like portion 221 are continuously connected to the engagement portion 23.
  • the zipper tape 20 is attached to an inner surface 10A of an opening portion 14 of the bag body 10.
  • the zipper tape 20 is sealed to the bag body 10 in a belt extending from one of the side seal bases 12 to the other of the side seal bases 12.
  • the engagement portion 23 of the zipper tape 20 defines a containing space 15 in the packaging bag 1.
  • the bottom side of the bag body 10 is sealed, whereby the packaging bag 1 is hermetically sealed.
  • a user cuts the opening portion 14 to open the packaging bag 1, and reseals the packaging bag with the zipper tape 20.
  • the zipper tape 20 includes the male member 21 provided on one side and the female member 22 provided to the other side to engage with the male member 21, the male and female members 21 and 22 each formed of a thermoplastic resin and having a belt-like shape.
  • the male member 21 includes: the male belt-like base 211 sealed to the bag body 10; a head 212 shaped substantially in an arrowhead in cross section; and a connecting portion 213 for connecting the male belt-like base 211 and the head 212.
  • the male belt-like base 211, the head 212 and the connecting portion 213 are integrally formed.
  • the female member 22 includes: the female belt-like base 221 sealed to the bag body 10; and a first hook 222 and a second hook 223 that each have an arcuate cross section and are connected to the female belt-like base 221.
  • the first hook 222 and the second hook 223 face each other and are in a form of a groove detachably engageable with the head 212 of the male member 21.
  • the male belt-like base 211 of the male member 21 includes: a base facing surface 221A that is sealed to the inner surface 10A in a manner to substantially face the inner surface 10A; and an engagement-portion formation surface 221B near the engagement portion 23 opposite to the base facing surface 221 A.
  • the female belt-like base 221 of the female member 22 includes: a base facing surface 221 A that is sealed to the inner surface 10A in a manner to substantially face the inner surface 10A; and an engagement-portion formation surface 221 B near the engagement portion 23 opposite to the base facing surface 221 A.
  • the engagement portion 23 of the zipper tape 20 is provided by the heat 212 of the male member 21 and the first and second hooks 222, 223 of the female member 22. By engagement or disengagement of the engagement portion 23, the packaging bag 1 is sealed or opened.
  • the female belt-like base 221 integrally formed with the female member 22 includes a thick portion 31, which is thicker than the female belt-like base 221, at an end 224 of the bag body 10 near a containing space 15.
  • a belt-like cut portion 32 which is formed thinner than the thick portion 31 and isolates the containing space 15 from the outside, is connected.
  • a seal base 33 which is formed thicker than the female belt-like base 221 and is sealed to the inner surface 10A, is connected.
  • the thick portion 31 is formed thicker than the female belt-like base 221 and projects from the engagement-portion formation surface 221B while being formed in a belt from one side seal base 12 to the other side seal base 12.
  • the thick portion 31 is formed substantially in the same thickness as that of the seal base 33.
  • a thickness of the thick portion 31 is preferably in a range of 250 ⁇ m to 550 ⁇ m, more preferably in a range of 350 ⁇ m to 450 ⁇ m.
  • the thickness of the thick portion 31 is less than 250 ⁇ m, a stress in opening the packaging bag 1 is difficult to concentrate on the cut portion 32.
  • the thickness of the thick portion 31 is more than 550 ⁇ m, it is difficult to form the side seal base 12.
  • the thick portion 31 is formed narrower toward the inner surface 10A of the bag body 10, the inner surface 10A facing the engagement-portion formation surface 221B.
  • the thick portion 31 is formed in a cross-sectionally trapezoidal shape, in which a width of the thick portion 31 becomes narrower toward its projecting end.
  • the thick portion 31 is sealed to the inner surface 10A through an end surface 311 facing the inner surface 10A. Under such a sealed situation, an end surface 312 of the thick portion 31, to which the cut portion 32 is connected, is formed substantially orthogonal to the inner surface 10A. Seal strength of the thick portion 31 to the inner surface 10A is lower than that of the seal base 33 to the inner surface 10A.
  • the seal strength of the thick portion 31 is adjusted by configuring the thick portion 31 to have a seal area smaller than a seal area of the seal base 33 (a seal area of an adhesion portion 331A later described) through a partial seal portion 311A that is sealed in a dashed line in a longitudinal direction (a horizontal direction in Fig. 1 ) of the cut portion 32.
  • the thick portion 31 is formed at a distance of 0.5 mm or more between an outside edge of the end surface 311 and an end of the male belt-like base 211 near the containing space 15.
  • the thick portion 31 in a cross-sectionally trapezoidal shape is formed to have an inclined surface 313 such that the outer edge of the end surface 311 is spaced away from the male belt-like base 211. Accordingly, the thick portion 31 is prevented from adhering to the male belt-like base 211 in sealing.
  • the cut portion 32 is formed in a belt extending from one of the side seal bases 12 to the other of the side seal bases 12 and in a direction orthogonal to the end surface 312 of the thick portion 31 (a vertical direction in Fig. 3 ).
  • the cut portion 32 is formed to have a seal strength lower than that of the seal base 33 to the inner surface 10A.
  • the cut portion 32 is formed so as to be cut before the seal base 33 is peeled from the inner surface 10A of the bag body 10.
  • a thickness of the cut portion 32 is preferably in a range of 10 ⁇ m to 80 ⁇ m, more preferably in a range of 30 ⁇ m to 60 ⁇ m.
  • the cut portion 32 When the thickness of the cut portion 32 is less than 10 ⁇ m, the cut portion 32 may be cut by external pressure when the packaging bag I is dropped. On the other hand, when the thickness of the cut portion 32 is more than 80 ⁇ m, it may be difficult to cut the cut portion 32 by hand. It should be noted that the strength of the cut portion 32 may not be adjusted simply by setting the thickness of the entire cut portion 32 in the above range. For instance, thin portions may be formed in the cut portion 32 at every predetermined distance between one of the side seal bases 12 and the other of the side seal bases 12. A width of the cut portion 32, i.e., a dimension in a direction substantially orthogonal to a longitudinal direction of the zipper tape 20 (i.e., the vertical direction in Fig.
  • the width of the cut portion 32 is preferably in a range of 0.3 mm to 1.5 mm, more preferably in a range of 0.8 mm to 1.2 mm. If the width of the cut portion 32 is less than 0.3 mm, when the zipper tape 20 is sealed to the bag body 10, it may be difficult to position the cut portion 32 so as not to contact with the male belt-like base 211 of the male member 21 and the inner surface 10A. On the other hand, when the width of the cut portion 32 is more than 1.5 mm, the cut portion 32 may be stretched in cutting to become difficult to cut.
  • the seal base 33 is formed in a belt having a cross-sectionally rectangular shape extending from one of the side seal bases 12 to the other of the side seal bases 12.
  • a seal surface 331 of the seal base 33 which is sealed to the inner surface 10A is formed substantially flush with the end surface 311 of the thick portion 31 which is sealed to the inner surface 10A (see Fig. 6 ).
  • the seal surface 331 includes the adhesion portion 331A that is bonded to the inner surface 10A in a comb-shape pattern. As shown in Fig. 1 , the adhesion portion 331A includes: a linear seal surface 331A1 that is linearly sealed along the longitudinal direction (the horizontal direction in Fig.
  • the linear seal surface 331A1 prevents leakage of the contents and the plurality of end seal surfaces 331A2 allow the stress to concentrate on the cut portion 32.
  • the end surface 333 of the seal base 33, to which the cut portion 32 is connected, is formed substantially parallel to the end surface 312 of the thick portion 31 facing the seal base 33 and substantially orthogonal to the inner surface 10A of the bag body 10.
  • the male member 21 of the zipper tape 20 of the exemplary embodiment can be integrally formed by co-extrusion, where the head 212 and the connecting portion 213 are continuously formed with the male belt-like base 211.
  • the female member 22 can be integrally formed by co-extrusion, where the first hook 222 and the second hook 223 are continuously formed with the female belt-like base 221.
  • the zipper tape 20 can be manufactured in a simplified process at low costs, and can be stably manufactured in a continuous manner.
  • the male member 21 and the female member 22 of the zipper tape 20 may be formed of polyethylene and polypropylene and are preferably formed of extension-resistant polypropylene.
  • thermoplastic resins such as homo-polypropylene, block-polypropylene, random polypropylene (RPP), propylene-ethylene-butene-1 random terpolymer and polyolefin-based special flexible resins, and a mixture thereof are usable.
  • a melt flow rate (MFR) of RPP is preferably from 0.5 to 20 g/10 min, particularly preferably from 1 to 15 g/10 min.
  • MFR of random polypropylene is less than 0.5 g/10 min, co-extrusion moldability of the engagement portion 23, which is formed continuously and integrally with the male belt-like base 211 and the female belt-like base 221, may be deteriorated.
  • the MFR exceeding 20 g/10 min may cause ends of the first and second hooks 222 and 223 of the female member 22 to be likely closed or may cause the connecting portion 213 of the male member 21 to be likely tilted down, which may make it difficult to extrude the zipper tape 20 into a predetermined reopenable/resealable shape.
  • the packaging bag 1 as shown in Fig. 1 can be obtained.
  • the base film 11 (packaging material) for forming the bag body 10 is preferably a layered film in which a sealant layer 111 is layered onto a base layer 112
  • the base film 11 may be a layered film in which a layered film layer (not shown) including layers of a gas barrier layer, a light-shielding layer and a strength-reinforcing layer is provided as a middle layer between the base layer 112 and the sealant layer 111, depending on a required performance.
  • Examples of the material for the base layer 112 are preferably a biaxially-oriented polypropylene film (OPP film), a biaxially-oriented polyester film such as biaxially-oriented polyethylene terephthalate film (PET film) and biaxially-oriented polyethylene naphthalate film and a biaxially-oriented polyamide film such as nylon 6, nylon 66 and MXD6 (poly-meta-xylylene adipamide).
  • POP film biaxially-oriented polypropylene film
  • PET film biaxially-oriented polyethylene terephthalate film
  • PET film biaxially-oriented polyethylene naphthalate film
  • a biaxially-oriented polyamide film such as nylon 6, nylon 66 and MXD6 (poly-meta-xylylene adipamide).
  • various engineering plastic films are also usable.
  • One of the above may be used alone, or a combination of two or more of the above may be layered in use.
  • the middle layer is a gas barrier layer
  • the usable material for the middle layer are a film of saponified ethylene-vinyl acetate copolymer (EVOH) or polyacrylonitrile (PAN), aluminum foil, a deposited layer of silica, alumina or aluminum and a coating layer of PVDC.
  • a deposited layer of silica, alumina or aluminum or a coating layer of PVDC When a deposited layer of silica, alumina or aluminum or a coating layer of PVDC is used, such a layer may be deposited or coated on the inner surface 10A of the bag body 10 of the base layer 112. Alternatively, such a layer may be preliminarily deposited or coated on another biaxially-oriented nylon film (ONy film), biaxially-oriented polyethylene terephthalate film (PET film) or biaxially-oriented polypropylene film (OPP film), and the film may be layered on the middle layer.
  • biaxially-oriented nylon film ON film
  • PET film biaxially-oriented polyethylene terephthalate film
  • OPP film biaxially-oriented polypropylene film
  • aluminum foil and a deposited layer of aluminum which are opaque, can also serve as a light-shielding layer.
  • the layering of the base layer 112 and the film of the intermediate layer can be conducted by a known dry
  • polypropylene (CPP) and the like are usable.
  • the above resins may be formed into film and layered by a dry lamination method or extrusion lamination method. Alternatively, the above resins may be layered thereon by extrusion coating.
  • the packaging bag 1 according to this exemplary embodiment can be easily manufactured with use of, for instance, a bag-making machine for three-sided sealing and attaching a zipper tape. Sealing conditions (temperature, pressure, etc.) in the manufacturing can be properly determined in accordance with types of the resins for forming the zipper tape 20 and the base film 11 for forming the bag body 10.
  • FIG. 2 shows engagement of the male member 21 and the female member 22 of the zipper tape 20.
  • the adhesion portion 331A of the seal base 33 is sealed to the inner surface 10A of the bag body 10. This arrangement can maintain airtightness and water-tightness of the bag, and liquid contents can be kept from infiltrating into a gap in the engagement portion 23 of the zipper tape 20, for instance, during transportation.
  • the opening portion 14 is cut to open the zipper tape 20, thereby disengaging the engagement of the engagement portion 23.
  • the thick portion 31 is peeled from the inner surface 10A of the bag body 10 by such an opening force, as shown in Fig. 5 .
  • stretching force acts on the cut portion 32.
  • the end surface 333 of the seal base 33 near the cut portion 32 is kept orthogonal to the inner surface 10A of the bag body 10 by the end seal surfaces 331 A2 of the adhesion portion 33 1A, the end surface 333 of the seal base 33 does not become loose from the inner surface 10A, so that the stretching force efficiently acts on the cut portion 32.
  • the cut portion 32 is cut by the stretching force, so that the thick portion 31 is separated from the seal base 33.
  • the contents can be taken out from the inside of the packaging bag 1.
  • the manufacturing instrument used for manufacturing the packaging bag 1 includes a bag-making section.
  • Fig. 6 shows how the contents are sealed in a substantial part of the bag-making section.
  • Fig. 6 shows how the contents are sealed in a substantial part of the bag-making section.
  • the bag-making section includes: a tape adhesion section (not shown) that positions the zipper tape 20 fed from a tape feeder (not shown) between a pair of the base films 11 fed from a packaging material feeder (not shown) and heat-seals the zipper tape 20 to both of the base films 11; and a seal section that seals and weld-cuts the delivered base films 11 at a predetermined distance in a delivering direction of the base films 11, i.e., at a distance corresponding to a dimension in a width direction of the packaging bag 1, thereby forming the packaging bag 1.
  • the seal section includes a pair of seal bars 60 that are disposed to face each other with interposing the packaging bag 1 that is filled with contents P while the zipper tape 20 is fastened.
  • the seal bars 60 are mutually approachable and separable.
  • the packaging bag 1 containing the contents P is held at a predetermined position.
  • one of the seal bars 60 presses the seal base 33 via the base film 11, thereby forming the adhesion portion 331A on the seal base 33.
  • the one of the seal bars 60 is provided with pressing protrusions 60A in the same continuous comb-shape as that of the adhesion portion 331A.
  • the adhesion portion 331A of the seal base 33 is formed to have a predetermined width in the width direction of the bag body 10 and a comb-shape dented at a predetermined distance in the longitudinal direction of the bag body 10.
  • the adhesion portion 331 A is sealed with the seal bars 60 in such a manner that ends of the pressing protrusions 60A reach the thick portion 31 across the cut portion 32.
  • the adhesion portion 331 A is formable by using the seal bars 60 provided with the pressing protrusions 60A having the same shape as the adhesion portion 331A.
  • the packaging bag 1 in which the thick portion 31 is easily peelable and the cut portion 32 is easily cuttable by the force applied for opening the zipper tape 20.
  • the thick portion 31 is formed thick at the end 224 of the female belt-like base 221 near the containing space 15.
  • the cut portion 32 thinner than the female belt-like base 221 is provided.
  • the seal base 33 which is thicker than the female belt-like base 221 and is sealed to the inner surface 10A of the bag body 10 to which the male belt-like base 211 is attached, is provided.
  • the thick portion 31 is attached to the inner surface 10A to which the male belt-like base 211 is attached by the seal strength lower than that of the seal base 33.
  • the cut portion 32 is formed to have strength lower than the seal strength of the seal base 33 and to be spaced away from the inner surface 10A of the bag body 10 and separate the containing space 15 from the outside in a form of a belt.
  • an area surrounded by the thick portion 31, the cut portion 32, the seal base 33 and the inner surface 10A of the bag body 10 becomes substantially hermetically sealed. Accordingly, even if external pressure or internal pressure of the bag is applied on the bag body 10 to which the zipper tape 20 is attached and which contains the contents P in the containing space 15, the substantially hermetically sealed area works as a buffer area of the pressure applied on a surface of the cut portion 32 near the containing space 15.
  • the cut portion 32 is prevented from being stretched by external pressure or internal pressure of the bag to be broken on next impact, or the cut portion 32 is prevented from occasionally having pinholes to damage sealability for separating the containing space 15 from the outside, particularly water-tightness. Consequently, according to this exemplary embodiment, it is avoidable to damage openability by forming the cut portion 32 thick for improving sealability, thereby providing both a favorable openability and a sufficient sealability.
  • the thick portion 31 and the seal base 33 are formed substantially in the same thickness.
  • the seal bars 60 heat-weld the thick portion 31 and the seal base 33, the seal bars 60 come into contact with the thick portion 31 and the seal base 33 substantially at the same time, whereby a predetermined pressure is applied on the end surface 311 of the thick portion 31 and the seal surface 331 of the seal base 33, so that the end surface 311 and the seal surface 331 can be bonded under a predetermined heat-welding condition.
  • the seal bars 60 need to be pressed harder in order to seal the other, so that the cut portion 32 may be damaged by heat.
  • the cut portion 32 may be stretched to damage sealability when external pressure is applied on the bag body 10.
  • the thick portion 31 is formed thicker, the seal strength is increased to require a large force for peeling the thick portion 31 from the bag body 10 in opening, so that an opening feeling may be impaired.
  • the seal bars 60 are formed corresponding to different thicknesses for solving such disadvantages, a shape of the seal bars 60 becomes complicated to increase instrument costs and positioning of the seal bars 60 in sealing also becomes complicated, so that the manufacturing efficiency of the packaging bag I may not be improved.
  • an arrangement in which the thick portion 31 is sealable by the seal strength lower than that of the seal base 33 is provided by a simple arrangement in which the thick portion 31 and the seal base 33 are formed substantially in the same thickness.
  • the thick portion 31 is formed in a cross-sectionally trapezoidal shape, in which a width of the thick portion 31 becomes narrower toward the inner surface 10A of the bag body 10.
  • a seal depth is easily adjustable, which makes it possible to set the seal conditions in a broad range.
  • the thick portion 31 is formed in a cross-sectionally inverse trapezoidal shape in which the width of the thick portion 31 becomes wider toward the end surface 311 and the inclined surface 313 is inversely inclined, it is difficult to stably mold the thick portion 31 to hinder improvement in productivity.
  • the cut portion 32 is formed in a belt extending in a direction orthogonal to the end surface 312 of the thick portion 31 (in the vertical direction in Fig. 3 ). Accordingly, even when external pressure is applied on the bag body 10, the external pressure is substantially evenly applied on the entire cut portion 32, so that the cut portion 32 can be kept from being stretched by partially receiving a high pressure, and decrease in water-tightness caused by generation of pinholes can be prevented.
  • the seal base 33 is designed to have a higher seal strength higher than the thick portion 31.
  • Examples of methods to achieve the above arrangement include: sealing the thick portion 31 and the seal base 33 from an outer surface of the bag body 10 using comb-shaped heat seal bars 60; forming the thick portion 31 using a non-compatible resin with the resin used in the sealant layer 111 of the bag body 10; and setting a melting point of the resin used for the thick portion 31 higher than a melting point of the resin used for the seal base 33.
  • Fig. 9 is an enlarged perspective view showing a vicinity of a seal base of a zipper tape of a packaging bag according to the second exemplary embodiment of the invention. It should be noted that, in the second exemplary embodiment, description of an arrangement that is the same as or similar to the arrangement of the first exemplary embodiment is omitted or simplified.
  • a thick portion 41 of the second exemplary embodiment is provided by forming the thick portion 31 of the first exemplary embodiment into a cross-sectionally rectangular shape.
  • the thick portion 41 includes two ribs 411 having a cross-sectionally triangular shape along a longitudinal direction of the cut portion 32 on a surface of the thick portion 41 facing the inner surface 10A of the bag body 10 to which the male belt-like base 211 is attached.
  • the ribs 411 are preferably formed to have a predetermined height. Specifically, when the height is less than 5 ⁇ m, the rib is sealed up to an end surface of a base thereof, which means that formation of the ribs 411 is not necessary. When the height is more than 300 ⁇ m, it is difficult to form the side seal bases 12 in the packaging bag 1.
  • a thickness of the thick portion 41 which is defined as a dimension from a bottom surface continuous to the female belt-like base 221 to a tip end of the rib 411, is formed substantially the same as that of the seal base 33.
  • the seal base 33 is bonded to the bag body 10 with an arrangement in which the linear seal surface 331A1 and the end seal surface 331A2 of the adhesion portion 331A in the first exemplary embodiment are separated.
  • the seal strength is reduced because of decrease in seal area on the bag body 10, so that a large force is not required in opening and a favorable opening feeling can be provided.
  • the thick portion 41 can easily be bonded to the bag body 10 by a seal strength lower than that of the seal base 33 and a favorable opening can be provided.
  • the ribs 411 are not limited to two ribs, but may be provided by a single rib or plural ribs.
  • a shape of each of the ribs 411 is not only linear, but may be wavy or in a dashed line.
  • the adhesion portion 331A of the seal base 33 may be bonded by any bonding method such as one in a comb-shape pattern of the first exemplary embodiment.
  • Fig. 10 is a cross-sectional view showing engagement of a male member and a female member of a zipper tape in a packaging bag according to a third exemplary embodiment of the invention. Also in the third exemplary embodiment, description of an arrangement that is the same as or similar to the arrangement of the above exemplary embodiments is omitted or simplified.
  • a cut portion 42 is provided by forming the cut portion 32 of the second exemplary embodiment in a plane on which the cut portion 42 intersects with the inner surface 10A of the bag body 10 facing the thick portion 41 and the seal base 33.
  • a curved surface 421 formed in a cross-sectionally arc at an acute connecting point between the cut portion 42 and the seal base 33.
  • a favorable opening feeling can be provided in opening and a favorable sealability can be obtained without causing such damage as the cut portion 42 is stretched even when external pressure is applied.
  • a direction in which the plane of the cut portion 42 is inclined is not limited to the above arrangement, but may be an inverse direction.
  • the cut portion 42 may be curved.
  • FIG. 11 is a cross-sectional view showing engagement of a male member and a female member of a zipper tape in a packaging bag according to a fourth exemplary embodiment of the invention. Also in the fourth exemplary embodiment, description of an arrangement that is the same as or similar to the arrangement of the above exemplary embodiments is omitted or simplified.
  • a cut portion 52 is provided by forming the cut portion 42 of the second exemplary embodiment thicker toward the thick portion 41. With this arrangement, a position where the cut portion 52 is cut is a connecting point (the thinnest point) between the cut portion 52 and the seal base 33, so that the products can be cut at the same cut position and the opening feeling can be kept constant.
  • Fig. 12 is a cross-sectional view showing engagement of a male member and a female member of a zipper tape in a packaging bag according to a fifth exemplary embodiment of the invention. Also in the fifth exemplary embodiment, description of an arrangement that is the same as or similar to the arrangement of the above exemplary embodiments is omitted or simplified.
  • the female belt-like base 221 of the female member 22 in the first exemplary embodiment includes an adhesion base 24 at an end near the opening portion 14.
  • the female belt-like base 221 of the female member 22 is bonded to the inner surface 10A of the bag body 10 near the male member 21 with the engagement-portion formation surface 211 B via the adhesion base 24.
  • An opening tape 40 is attached between the adhesion base 24 and the male belt-like base 211 of the male member 21.
  • the base facing surface 221 A opposite to the engagement-portion formation surface 211B is spaced away from the inner surface 10A of the bag body 10 at a predetermined distance. In other words, the female belt-like base 221 of the female member 22 is not sealed to the inner surface 10A of the bag body 10.
  • the base facing surface 221 A is spaced away from the inner surface 10A of the bag body 10 at a predetermined distance. Accordingly, the containing space 15 is enlarged, i.e., a so-called dead space is decreased, so that the packaging bag 1 can contain larger amount of contents. Moreover, the internal pressure of the packaging bag 1 is less likely to be applied on the cut portion 32, so that damage (e.g., the stretch) to the cut portion 32 can be prevented even when an external force (e.g., impact on the bag body 10 when dropped) is applied.
  • damage e.g., the stretch
  • the pair of seal bars 60 that are positioned to face each other with the packaging bag 1 interposed therebetween are used for heat-welding the thick portion 31, 41 and the seal base 33, but an arrangement of the seal bars 60 is not limited to this. For instance, only a single seal bar may be provided on one side of the packaging bag 1, or plural seal bars may be provided on one side of the packaging bag 1.
  • the adhesion method for the thick portion 31, 41 and the seal base 33 is not limited to the heat-welding method. Various methods such as an adhesion method using an adhesive or the like are applicable.
  • the zipper tape shaped as shown in Fig. 2 was manufactured under the following conditions.
  • a packaging bag was manufactured in the same manner as that in Example 1 except that the dimensions of the portions of the zipper tape in Example 1 were replaced by the following.
  • a packaging bag was manufactured in the same manner as that in Example 1 except that the dimensions of the portions of the zipper tape in Example 1 were replaced by the following.
  • JP-A-2008-24324 ( Fig. 4 ) discloses:
  • the invention is applicable as a packaging bag for packaging various articles such as foods, pharmaceutical and medical products, cosmetics and groceries.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Slide Fasteners (AREA)
EP11742259.2A 2010-02-12 2011-02-09 Bande de fermeture à glissière et sac d'emballage doté d'une bande de fermeture à glissière Withdrawn EP2535288A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010029236 2010-02-12
PCT/JP2011/052737 WO2011099516A1 (fr) 2010-02-12 2011-02-09 Bande de fermeture à glissière et sac d'emballage doté d'une bande de fermeture à glissière

Publications (2)

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EP2535288A1 true EP2535288A1 (fr) 2012-12-19
EP2535288A4 EP2535288A4 (fr) 2014-12-03

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US (1) US20120314978A1 (fr)
EP (1) EP2535288A4 (fr)
JP (1) JP5639091B2 (fr)
KR (1) KR20120135900A (fr)
CN (1) CN102753448B (fr)
TW (1) TW201144168A (fr)
WO (1) WO2011099516A1 (fr)

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JP6299256B2 (ja) * 2014-02-12 2018-03-28 凸版印刷株式会社 パウチ
WO2015167405A1 (fr) * 2014-04-29 2015-11-05 Oonpipat Vichanya Sac ou revêtement de sac ayant une fermeture à glissière souple, et procédé de production de ladite fermeture à glissière souple
EP3194289A4 (fr) 2014-09-18 2018-05-23 Mark Steele Emballage à élément d'ouverture à l'épreuve des enfants
WO2017119449A1 (fr) * 2016-01-07 2017-07-13 出光ユニテック株式会社 Bande de fermeture à glissière, sac, et procédé de production de sac
CN106136482A (zh) * 2016-08-15 2016-11-23 浙江水利水电学院 一种联动式拉链头及具有该联动式拉链头的拉链
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Also Published As

Publication number Publication date
CN102753448B (zh) 2014-06-04
US20120314978A1 (en) 2012-12-13
JP5639091B2 (ja) 2014-12-10
WO2011099516A1 (fr) 2011-08-18
CN102753448A (zh) 2012-10-24
TW201144168A (en) 2011-12-16
EP2535288A4 (fr) 2014-12-03
JPWO2011099516A1 (ja) 2013-06-13
KR20120135900A (ko) 2012-12-17

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