IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0152318
(2002-05-20)
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발명자
/ 주소 |
- Hutchinson, Gerald A.
- Lee, Robert A.
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출원인 / 주소 |
- Advanced Plastics Technologies
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대리인 / 주소 |
Knobbe, Martens, Olson & Bear, LLP
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인용정보 |
피인용 횟수 :
49 인용 특허 :
123 |
초록
▼
This invention relates to articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics, and novel methods of making such articles. Preferably
This invention relates to articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics, and novel methods of making such articles. Preferably the barrier-coated articles take the form of preforms coated by at least one layer of barrier material and the containers blow-molded therefrom. Such barrier-coated containers are preferably of the type to hold beverages such as soft drinks, beer or juice. The preferred barrier materials have a lower permeability to oxygen and carbon dioxide than PET as well as key physical properties similar to PET. The materials and methods provide that the barrier layers have good adherence to PET, even during and after the blow molding process to form containers from preforms. Preferred barrier coating materials include poly(hydroxyamino ethers). In one preferred method, preforms are injection molded then barrier-coated immediately thereafter.
대표청구항
▼
This invention relates to articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics, and novel methods of making such articles. Preferably
This invention relates to articles made of polyester, preferably polyethylene terephthalate (PET), having coated directly to at least one of the surfaces thereof one or more layers of thermoplastic material with good gas-barrier characteristics, and novel methods of making such articles. Preferably the barrier-coated articles take the form of preforms coated by at least one layer of barrier material and the containers blow-molded therefrom. Such barrier-coated containers are preferably of the type to hold beverages such as soft drinks, beer or juice. The preferred barrier materials have a lower permeability to oxygen and carbon dioxide than PET as well as key physical properties similar to PET. The materials and methods provide that the barrier layers have good adherence to PET, even during and after the blow molding process to form containers from preforms. Preferred barrier coating materials include poly(hydroxyamino ethers). In one preferred method, preforms are injection molded then barrier-coated immediately thereafter. 1 mm and the first, second, and third segment lengths are between about 10 μm and about 500 μm. 13. The method of claim 1 in which the cutting path length is greater than 1 mm and the first, second, and third segment lengths are between about 10 μm and about 500 μm. 14. The method of claim 13 in which the cutting path length is greater than 10 mm and the first, second, and third segment lengths are between about 200 μm and about 500 μm. 15. The method of claim 13 in which the first, second, and third laser pulses are characterized by a UV wavelength, a pulse repetition frequency of greater than 5 kHz, pulse energies of greater than 200 μJ, and a bite size of about 0.5 to about 50 μm. 16. The method of claim 1 in which the first, second, and third laser pulses are characterized by a UV wavelength, a pulse repetition frequency of greater than 5 kHz, pulse energies of greater than 200 J, and a bite size of about 0.5 to about 50 μm. 17. The method of claim 16 in which the workpiece has a thickness greater than 50 μm. 18. The method of claim 17 in which the workpiece has a thickness greater than 500 μm. 19. The method of claim 12 in which the workpiece has a thickness greater than 50 μm. 20. The method of claim 12 in which the workpiece has a thickness greater than 500 μm, the cutting path length is greater than 100 mm, and the throughcut along the entire length of the cutting path is made with fewer than 25 passes of laser pulses over any position along the cutting path. 21. The method of claim 13 in which the workpiece has a thickness greater than 200 μm, further comprising: cutting through the entire thickness along the cutting path at a cutting speed of greater than 10 mm per minute. 22. The method of claim 21 in which a major portion of the thickness of the workpiece comprises a semiconductor material, a glass material, a ceramic material, or a metallic material. 23. The method of claim 21 in which a major portion of the thickness of tile workpiece comprises Si, GaAs, SiC, SiN, indium phosphide, or AlTiC. 24. The method of claim 22 in which the laser pulses are generated from a solid-state laser or a CO2laser. 25. The method of claim 1 in which the laser pulses are generated from a solid-state laser or a CO2laser. 26. The method of claim 2 in which the overlap length of the first and second portions or the first or second segment lengths are sufficiently short such that the second laser pulses impinge along the overlap length before a major portion of any debris generated by the first laser pulses cools along the overlap length to ambient temperature. 27. The method of claim 1 in which the third segment excludes the first or second segments. 28. The method of claim 1 in which the first laser pulses impinge along the cutting path in a first cutting direction and the first laser pulses have a first polarization orientation that is parallel to the first cutting direction, in which the third laser pulses impinge along the cutting path in a third cuffing direction and the third laser pulses have a third polarization orientation that is parallel to the third cutting direction, and in which the first and third cutting directions are transverse. 29. The method of claim 28 further comprising: employing a polarization control device to change from the first polarization orientation to the third polarization orientation. 30. The method of claim 10 further comprising: monitoring throughcut status with a throughcut monitor to determine throughcut positions where throughcuts have been affected along the cutting path; and reducing impingement of the throughcut positions during the passes of first, second, third, or subsequent laser pulses in response to information provided by the throughcut monitor. 31. The method of claim 1 in which the laser pulses within the first pass have generally similar parameters. 32. The method of claim 1 in which the laser pulses of the first, second, and third
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