# US 8,540,428 B2 · Easily tearable fastener tape, method of producing the fastener tape, packaging bag with easily tearable fastener tape, and device and method for producing the packaging bag

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- Number: US 8,540,428 B2
- Document ID: US8540428B2
- Status: Granted
- Kind: B2
- Application number: 12/442,204
- Filed: 2007-06-27
- Published: 2010-03-25
- Granted: 2013-09-24
- Earliest claimed: 2006-09-22
- Assignees: Idemitsu Unitech Co., Ltd.
- Applicants: Yoshinori Nanba; Kenichi Tanaka; Shuichi Goto
- Inventors: Yoshinori Nanba; Kenichi Tanaka; Shuichi Goto
- Web page: https://patentgrep.com/patent/US8540428B2

## CPC

- B65D 33/2508: {using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor}
- B29C 65/02: by heating, with or without pressure
- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- B29C 66/3452: {Making complete joints by combining partial joints}
- B29C 66/346: {Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration}
- B29C 66/43121: {Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags (closing tube ends B29C57/10)}
- B29C 66/474: {said single elements being substantially non-flat}
- B29C 66/80: {General aspects of machine operations or constructions and parts thereof}
- B29C 66/81427: {comprising a single ridge, e.g. for making a weakening line; comprising a single tooth}
- B29C 66/81431: {comprising a single cavity, e.g. a groove}
- B29D 5/10: the interlocking members being formed by continuous profiled strip
- B65D 33/2533: {the slide fastener being located between the product compartment and the tamper indicating means}
- B65D 33/2541: {characterised by the slide fastener, e.g. adapted to interlock with a sheet between the interlocking members having sections of particular shape}
- B65D 75/5805: {for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/72321: {consisting of metals or their alloys}
- B29C 66/72325: {Ceramics}
- B29C 66/72341: {for gases}
- B29C 66/81422: {being convex}
- B29C 66/81423: {being concave}
- B29C 66/83221: {cooperating reciprocating tools, each tool reciprocating along one axis}
- B29K 2023/00: Use of polyalkenes {or derivatives thereof} as moulding material
- B29K 2023/06: {PE, i.e. polyethylene}
- B29K 2023/0625: {LLDPE, i.e. linear low density polyethylene}
- B29K 2023/0633: {LDPE, i.e. low density polyethylene}
- B29K 2023/086: {EVOH, i.e. ethylene vinyl alcohol copolymer}
- B29K 2023/12: {PP, i.e. polypropylene}
- B29K 2027/08: {PVDC, i.e. polyvinylidene chloride}
- B29K 2033/20: PAN, i.e. polyacrylonitrile
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29K 2101/12: Thermoplastic materials
- B29K 2305/02: Aluminium
- B29K 2995/0053: bi-axially
- B29K 2995/0067: non-permeable
- B29L 2005/00: Elements of slide fasteners
- B29L 2009/003: {comprising a metal layer}
- B29L 2031/7128: {Bags, sacks, sachets (tea bags B29L2031/7122; medical bags B29L2031/7148)}
- B31B 70/642: {using sealing jaws or sealing dies}
- B31B 70/8132: {Applying the closure elements in the machine direction}
- Y10T 29/49: Method of mechanical manufacture
- Y10T 29/51: Plural diverse manufacturing apparatus including means for metal shaping or assembling
- 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
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B31B: MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making wound articles, e.g. wound tubes, B31C; combined making and filling B65B)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A belt-shaped base of a male member of a zipper tape attached to an inner surface of a bag body includes: a main body on which an engagement portion is provided; a first projecting portion provided on an opening-side of the main body; a thin portion connected to an opening-side of the first projecting portion; and a second projecting portion connected to an opening-side of the thin portion. A belt-shaped base of a female member includes: a main body; a first projecting portion; a thin portion; and a second projecting portion. When the zipper tape is fused onto the bag body, a space is provided between the thin portions and a film of the bag body.

## Claims

### Claim 1

An easily-tearable zipper tape that is attached to an inner surface of a package bag having an opening side, comprising: an engagement portion at which a male member and a female member are mated with each other; and belt-shaped bases provided continuously to the engagement portion of each of the male member and female member,
at least one of the belt-shaped bases comprising:
a main body on which the engagement portion is provided;
a first projecting portion provided on the main body on a side adjacent to the opening side, the first projecting portion being thicker than the main body;
a thin portion provided on the first projecting portion on a side adjacent to the opening side, and interposed between the first projectingportion and a second projecting portion, the thin portion being thinner than the first projecting portion and the main body; and
the second projecting portion provided on the thin portion on a side adjacent to the opening side, the second projecting portion being thicker than the thin portion and the main body,
wherein opposing surfaces of the first projecting portion and the second projecting portion respectively facing the inner surface of the bag body are substantially coplanarly positioned, and wherein the thin portion is recessed relative to the opposing surfaces to provide a level difference,
the thin portion defining a tearing guide piece which is torn at a predetermined position when opening the bag.

### Claim 2 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the belt-shaped bases of the male member and the female member respectively comprise the main body, the first projecting portion, the thin portion and the second projecting portion.

### Claim 3 (depends on 2)

The easily-tearable zipper tape according to claim 2, wherein
lengths of the thin portion provided on the male member and the thin portion provided on the female member are different.

### Claim 4 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
one of the belt-shaped bases provided on the male member and the female member comprises the main body, the first projecting portion, the thin portion and the second projecting portion, and
the other of the belt-shaped bases comprises the main body and the first projecting portion.

### Claim 5 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
one or more ribs having the same height as a thickness of the first projecting portion and the second projecting portion are provided on the main body on a closed side relative to the engagement portion.

### Claim 6 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the thickness of the thin portion is 0.12 mm or less, and
the thickness of the first projecting portion and the second projecting portion is 0.20 mm or more and 1 mm or less.

### Claim 7 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the width of the thin portion is 0.5 mm or more and 5 mm or less.

### Claim 8 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the first projecting portion, the second projecting portion and the thin portion are made of a polypropylene random copolymer.

### Claim 9 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the first projecting portion and the second projecting portion are provided by the same kind of resin,
the thin portion is provided by a kind of resin different from the resin of the first projecting portion and the second projecting portion, and
the main body is provided by a kind of resin different from the resin of the first projecting portion and the second projecting portion.

### Claim 10 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the first projecting portion, the second projecting portion and the thin portion are provided by the same kind of resin, and
the main body is provided by a kind of resin different from the resin of the first projecting portion, the second projecting portion and the thin portion.

### Claim 11 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
the first projecting portion, the second projecting portion, the thin portion and the main body are respectively provided by different kinds of resins.

### Claim 12 (depends on 1)

The easily-tearable zipper tape according to claim 1, wherein
a seal layer is provided on a surface of the first projecting portion, the second projecting portion and the main body to be attached to the inner surface of the bag body.

### Claim 13 (depends on 12)

The easily-tearable zipper tape according to claim 12, wherein
the melting point of the resin forming the seal layer is lower than a melting point of the resin forming the first projecting portion, the second projecting portion and the main body, and comprises:
(A) 50 mass % or more and 100 mass % or less of metallocene-type linear low-density polyethylene having a density of 920 kg/m3 or less and MFR of 5.0 g/10 min or less; and
(B) 0 mass % or more and 50 mass % or less of a composition consisting of propylene and α-olefin copolymer having 4 to 8 carbon atoms.

### Claim 14 (depends on 1)

A method of producing the easily-tearable zipper tape according to claim 1, comprising:
co-extruding the main body provided with the engagement portion, the first projecting portion, the second projecting portion and the thin portion in a single step.

### Claim 15 (depends on 1)

A package bag provided with an easily-tearable zipper tape, comprising: the easily-tearable zipper tape according to claim 1, and a bag body on which the easily-tearable zipper tape is attached, wherein
a space is defined by: an inner surface of the bag body; a surface of the thin portion facing the inner surface of the bag body; and surfaces of the first projecting portion and the second projecting portion intersecting the surface of the thin portion.

### Claim 16 (depends on 15)

The package bag provided with an easily-tearable zipper tape according to claim 15, wherein
a side seal portion is provided in a direction intersecting the easily-tearable zipper tape, and
the thin portion is wider at the side seal portion than the thin portion located on an inner side of the side seal portion.

### Claim 17 (depends on 16)

A producing device for producing the package bag provided with an easily-tearable zipper tape according to claim 16, comprising:
a pair of point seal bars that collapse the thin portion at the side seal portion,
at least one of the pair of point seal bars comprising a convex portion of which height is greater than a height of the space.

### Claim 18 (depends on 17)

The producing device of the package bag provided with an easily-tearable zipper tape according to claim 17, wherein
the pair of point seal bars include a plurality of pairs of point seal bars respectively having differently sized contact surface on the convex portion.

### Claim 19 (depends on 18)

A producing method for producing the package bag provided with an easily-tearable zipper tape using the producing device according to claim 18, wherein:
the pair of point seal bars include a plurality of pairs of point seal bars respectively having differently sized contact surface on the convex portion, and
a sealing process is sequentially conducted starting from one of the pairs of point seal bars having the smallest contact surface on the convex portion.

### Claim 20 (depends on 17)

A producing method for producing the package bag provided with an easily-tearable zipper tape using the producing device according to claim 17, comprising:
when the thin portion is collapsed, aligning the convex portion with a position of the thin portion; and melting and flattening the thin portion from a center of the thin portion toward an outside.