# US 8,465,817 B2 · Polyester container

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- Number: US 8,465,817 B2
- Document ID: US8465817B2
- Status: Granted
- Kind: B2
- Application number: 10/577,371
- Filed: 2004-11-04
- Published: 2007-04-12
- Granted: 2013-06-18
- Earliest claimed: 2003-11-04
- Assignees: Toyo Seikan Kaisha, Ltd.
- Applicants: Yasushi Hatano; Tsutomu Iwasaki; Masahito Kogure; Hideo Kawasaki; Hisao Iwamotoi
- Inventors: Yasushi Hatano; Tsutomu Iwasaki; Masahito Kogure; Hideo Kawasaki; Hisao Iwamotoi
- Web page: https://patentgrep.com/patent/US8465817B2

## CPC

- B65D 77/2024: {the cover being welded or adhered to the container}
- B29C 51/04: Combined thermoforming and prestretching, e.g. biaxial stretching
- B29C 65/02: by heating, with or without pressure
- B29C 65/10: using hot gases {(e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined}
- B29C 65/1412: {Infrared [IR] radiation}
- B29C 65/1422: {Far-infrared radiation [FIR]}
- B29C 66/112: {Single lapped joints}
- B29C 66/114: {Single butt joints}
- B29C 66/131: {Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area}
- B29C 66/24221: {being circular (B29C66/51 takes precedence)}
- B29C 66/30223: {said melt initiators being rib-like}
- B29C 66/342: {Preventing air-inclusions}
- B29C 66/53461: {joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 65/08: using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)}
- B29C 66/72328: {Paper}
- B29C 66/72341: {for gases}
- B29C 66/8322: {Joining or pressing tools reciprocating along one axis}
- B29C 66/849: {Packaging machines}
- B29C 2791/006: Using vacuum
- B29C 2791/007: Using fluid under pressure
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29K 2995/0053: bi-axially
- B29L 2031/7132: {Bowls, Cups, Glasses}
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1379: Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
- Y10T 428/1397: Single layer [continuous layer]
- 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)
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polyester container furnished with a flange part having mechanical strength, transparency, and heat resistance through orientational crystallization, which polyester container exhibits low-temperature heat sealability, is provided by forming a projecting portion at an upper surface of the crystallized flange part, the projecting portion at at least a heat-sealing-face constituting region rendered amorphous or of low crystallinity. Further, in order to suppress the unevenness of the strength of sealing with a cover member and stably attain the high sealability, the projecting portion is deformed at the time of heat sealing with the cover member so as to form a resin piece protruding toward the interior of the container while being substantially appressed against the upper surface of an opening rim part. The formed resin piece couples with a sealant layer of the cover member.

## Claims

### Claim 1

A polyester container, comprising:
a trunk portion;
a flange integrally formed with the trunk portion and having a flat upper surface; and
a heat sealing structure integrally formed with the flange and adapted to form a hermetic heat seal between the container and a cover member, the heat sealing structure comprising a projecting portion projecting from the flat upper surface of the flange,
wherein the projecting portion is formed at a center or an outer peripheral side of the flat upper surface relative to a width direction of the flat upper surface so that at least a portion of the projecting portion which becomes a heat-sealing-face of the heat seal comprises an amorphous portion or a lowly crystallized portion, and which has a crystallinity lower than that of a rest of the flange except for the at least the portion of the projecting portion which becomes the heat-sealing-face.

### Claim 2 (depends on 1)

The polyester container according to claim 1, wherein
the flange comprises a first crystallized region forming said at least portion of the projecting portion, and a second crystallized region forming the rest of the flange,
a crystallinity of the second crystallized region is 20% or more, and
a crystallinity of the first crystallized region is in a range of 0 to less than 20%.

### Claim 3 (depends on 1)

The polyester container according to claim 1, wherein a thickness of the projecting portion is in a range of 0.1 to 2.0 mm.

### Claim 4 (depends on 1)

The polyester container according to claim 1, wherein
the container is a cup-like container, and
at least the trunk portion of the container is orientationally or thermally crystallized.

### Claim 5 (depends on 1)

The polyester container according to claim 1, wherein the upper surface of the flange has a tapered face inclined obliquely upwards from a base portion of the projecting portion to an interior of the container.

### Claim 6 (depends on 1)

The polyester container according to claim 1, further comprising a cover member having a sealant layer made of a polyester resin with a melting point of 110° C. to 225° C.

### Claim 7 (depends on 6)

The polyester container according to claim 6, wherein the sealant layer is made of a polybutylene-terephthalate-based resin.