# US 5,700,091 A · Snap fastener and a bag for packaging with a snap fastener

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- Number: US 5,700,091 A
- Document ID: US5700091A
- Status: Granted
- Kind: A
- Application number: 08/707,521
- Filed: 1996-09-04
- Granted: 1997-12-23
- Earliest claimed: 1995-09-04
- Assignees: Idemitsu Petrochemical Co., Ltd.
- Inventors: Kenichi Tanaka; Masao Takashige
- Web page: https://patentgrep.com/patent/US5700091A

## CPC

- B32B 27/08: of synthetic resin
- B32B 3/04: characterised by {at least one} layer folded at the edge, e.g. over another layer {; characterised by at least one layer enveloping or enclosing a material}
- B32B 27/34: comprising polyamides
- B65D 33/2533: {the slide fastener being located between the product compartment and the tamper indicating means}
- A44B 19/16: Interlocking member having uniform section throughout the length of the stringer {(for sacks or bags B65D33/2508)}
- B32B 2307/518: bi-axially
- B32B 2439/70: Food packaging
- B32B 2439/80: Medical packaging
- Y10S 24/50: including member having elongated, resilient, interlocking face with identical, parallel cross-sections throughout its length
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- A44B: BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE (fastenings specially adapted for footwear A43C)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A snap fastener having a male strip member and a female strip member, mutually engaged and respectively having a band-like base portion and a snapping portion having a snapping function, in which the band-like base portion includes a first layer fused onto a bag body; a second layer laminated onto the first layer; and a third layer laminated onto the second layer, and further the first layer is consisted of a resin film fusing the inner-most layer of the bag body, the second layer consists of a biaxially oriented film, the third layer consists of a resin film fusing the snapping portion, and the snapping portion consists of synthetic resin having a melt index (MI) of 1-20 g/10 min. At least one layer of the biaxially oriented nylon film consists 40-85% by weight of nylon 6 (Ny 6) and 15-60% by weight of metaxylylene adipamide (MXD 6), in which both magnifications of the MD direction (the moving direction of the film) and the TD direction (the direction of the width of the film) in extending are more than 2.8 times.

## Claims

### Claim 1

A snap fastener, having a male strip member and a female strip member which are mutually engaged and each has a band-like base portion and a snapping portion having a snapping function, the improvement comprising:
a first layer forming in the band-like base portion to be fused onto a bag body;
a second layer forming in the band-like base portion to be laminated onto said first layer; and
a third layer forming in the band-like base portion to be laminated onto said second layer, said first layer consisting of a resin film fusing the inner-most layer of the bag body, said second layer consisting of a biaxially oriented film, said third layer consisting of a resin film fusing the snapping portion, and the snapping portion consisting of synthetic resin having a melt index (MI) of 1-20 g/10 min.

### Claim 2 (depends on 1)

The snap fastener according to claim 1 wherein the biaxially oriented film of said second layer is a biaxially oriented nylon film having more than one layer.

### Claim 3 (depends on 2)

The snap fastener according to claim 2 wherein at least one layer of the biaxially oriented nylon film consists 40-85% by weight of nylon 6 (Ny 6) and 15-60% by weight of meta-xylylene adipamide (MXD 6), in which both magnifications of the MD direction (the moving direction of the film) and the TD direction (the direction of the width of the film) in extending are more than 2.8 times.

### Claim 4

A bag for packaging with a snap fastener, in which the bag for packaging is fused thereon with the snap fastener having a male strip member and a female strip member, mutually engaged and respectively having a band-like base portion and a snapping portion having a snapping function, the improvement comprising:
a first layer forming in the band-like base portion to be fused onto a bag body;
a second layer forming in the band-like base portion to be laminated onto said first layer; and
a third layer forming in the band-like base portion to be laminated onto said second layer, said first layer consisting of a resin film fusing the most-inside layer of the bag body, said second layer consisting of a biaxially oriented film, said third layer consisting of a resin film fusing the snapping portion, and the snapping portion consisting of synthetic resin having a melt index (MI) of 1-20 g/10 min. and being fused through said first layer onto the bag body.

### Claim 5 (depends on 4)

The bag for packaging with the snap fastener according to claim 4, further comprising:
a first fusing portion formed adjacent to the snapping portion, which is formed in a fusing portion fusing between the snapping portion and the bag body; and
a second fusing portion formed in the opening side of the bag body to oppose a non-fusing portion from said first fusing portion, which is formed in the fusing portion fusing between the snapping portion and the bag body.