US4524045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating bottle-shaped container of saturated polyester
Assignee: Yoshino Kogyosho Co Ltd
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Filing: 1983-08-24
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Granted: 1985-06-18
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Expires: 2003-08-24
Abstract
Abstract This invention relates to a method of fabricating a bottle-shaped container of saturated polyester having superior mechanical strength, very low degrees of age and high temperature deformation, and superior dimensional stability. The piece for forming the bottle-shaped container is heated to an orientation temperature, is biaxially oriented in a blowing mold and is then thermally set by maintaining the outer wall surface of the expanded container in contact with the inner wall surface of the mold, which is kept at a temperature in the range between the glass transition point and the crystallization temperature, for longer than 5 seconds. The blowing mold is formed with the size adjusted in capacity by approx. 6% to allow for shrinkage of the product container when the container is exposed to a high temperature greater than 70° C. and then left to stand, so as to thereby obtain a container of accurate capacity.
Inventors
- 👤 Yoshiaki Hayashi
- 👤 Kouichi Haraguchi
- 👤 Yukio Koshidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:39
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/08; B29C49/10; B29C49/12; B29C49/6604; B29C2049/6606; B29C2049/6676; B29C2049/6692; B29K; B29K2067/00; Y; Y10; Y10S; Y10S264/00; Y10S264/90; Y10S264/903
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
216 words
A method of fabricating a bottle-shaped container of saturated polyester from a preformed cylindrical piece of polyethylene terephthalate with a bottom, comprising: heating the piece to a temperature for orienting, loading the heated piece into the blowing mold which is heated at a temperature in the range between the glass transition temperature and the orientation temperature of the saturated polyester, biaxially orienting the piece by longitudinally orienting the piece and then laterally orienting it by introducing compressed air into the interior of the piece while said piece is contained in the mold until the outer wall of the piece comes into contact with the inner wall of the mold; the container expanded by said biaxially orienting step being thermally set by said contact with the outer wall of the container with the inner wall of the mold retained at a temperature in the range between substantially the glass transition temperature and the orientation temperature for a period of time in the range of six to eight seconds; opening the mold to unload and rapidly cool the container thus molded; said mold having a capacity upwardly adjusted by about 6% relative to the desired final capacity of said container, said blowing mold temperature being in the range of about 70° C. to less than about 80° C.
Claim 2
Independent Claim
216 words
A method of fabricating a bottle-shaped container of saturated polyester from a preformed cylindrical piece of polyethylene terephthalate with a bottom, comprising: heating the piece to a temperature for orienting, loading the heated piece into the blowing mold which is heated at a temperature in the range between the glass transition temperature and the orientation temperature of the saturated polyester, biaxially orienting the piece by longitudinally orienting the piece and then laterally orienting it by introducing compressed air into the interior of the piece while said piece is contained in the mold until the outer wall of the piece comes into contact with the inner wall of the mold; the container expanded by said biaxially orienting step being thermally set by said contact with the outer wall of the container with the inner wall of the mold retained at a temperature in the range between substantially the glass transition temperature and the orientation temperature for a period of time in the range of six to eight seconds; opening the mold to unload and rapidly cool the container thus molded; said mold having a capacity upwardly adjusted by about 6% relative to the desired final capacity of said container, said blowing mold temperature being in the range of about 70° C. to less than about 80° C.
Claim 3
Dependent Claim
60 words
The method according to claim 1, wherein the biaxial orientation is performed by means of a jig having a cylindrical mandrel, a circular disk formed integrally with the mandrel, a neck end portion support for holding the neck end portion of the piece, a core guide disposed inside the support, and a core shaft elevationally movably inserted into the mandrel.
Claim 4
Dependent Claim
20 words
The method according to claim 2, wherein the temperature at which said blowing mold is retained is about 70° C.
Claim 5
Dependent Claim
19 words
The method according to claim 2, wherein the piece is longitudinally oriented approximately 1.4 to 2.5 times its length.
Claim 6
Dependent Claim
62 words
The method according to claim 2, wherein said jig longitudinally orients the preformed piece 1.4 to 2.5 times within the blow molding machine by raising a rod to protrude the core shaft, and said jig laterally orients the preformed piece by introducing compressed air from said rod through an air vent slot in the rod into the interior of the preformed piece.
Claim 7
Dependent Claim
20 words
The method according to claim 1, wherein the temperature at which said blowing mold is retained is about 70° C.
Claim 8
Dependent Claim
26 words
The method of fabricating a bottle-shaped container as claimed in claim 1, wherein the piece is longitudinally oriented to approximately 1.4 to 2.5 times its length.
Claim 9
Independent Claim
223 words
A method of fabricating a bottle-shaped container from a preformed cylindrical piece of polyethylene terephthalate with a bottom, comprising: selecting a preformed piece with an intrinsic viscosity of more than 0.55, heating the piece to a temperature for orienting, loading the heated piece into the blowing mold which is heated at a temperature in the range between the glass transition temperature and the orientation temperature of the saturated polyester, biaxially orienting the piece by longitudinally orienting the piece and then laterally orienting it by introducing compressed air into the interior of the piece while said piece is contained in the mold until the outer wall of the piece comes into contact with the inner wall of the mold; the container expanded by said biaxially orienting step being thermally set by contact with the outer wall of the container with the inner wall of the mold retained at a temperature in the range between the glass transition temperature and the orientation temperature for a period of time in the range of six to eight seconds, opening the mold to unload and rapidly cool the container thus molded, said mold having a capacity upwardly adjusted by about 6% relative to the desired final capacity of said container, said blowing mold temperature being in the range of about 70° C. to less than about 80° C.
Claim 10
Independent Claim
223 words
A method of fabricating a bottle-shaped container from a preformed cylindrical piece of polyethylene terephthalate with a bottom, comprising: selecting a preformed piece with an intrinsic viscosity of more than 0.55, heating the piece to a temperature for orienting, loading the heated piece into the blowing mold which is heated at a temperature in the range between the glass transition temperature and the orientation temperature of the saturated polyester, biaxially orienting the piece by longitudinally orienting the piece and then laterally orienting it by introducing compressed air into the interior of the piece while said piece is contained in the mold until the outer wall of the piece comes into contact with the inner wall of the mold; the container expanded by said biaxially orienting step being thermally set by contact with the outer wall of the container with the inner wall of the mold retained at a temperature in the range between the glass transition temperature and the orientation temperature for a period of time in the range of six to eight seconds, opening the mold to unload and rapidly cool the container thus molded, said mold having a capacity upwardly adjusted by about 6% relative to the desired final capacity of said container, said blowing mold temperature being in the range of about 70° C. to less than about 80° C.
Claim 11
Dependent Claim
25 words
The method of fabricating a bottle-shaped container as claimed in claim 8, wherein the piece is longitudinally oriented approximately 1.4 to 2.5 times its length.
Claim 12
Dependent Claim
20 words
The method according to claim 8, wherein the temperature at which said blowing mold is retained is about 70° C.
Claim 13
Dependent Claim
23 words
The method according to claim 8, further comprising the step of cooling a bottom bush of the mold when thermally setting the container.
References Cited (Backward Citations)
FR2389478A1
Cited
US4385089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |