Vessel inspection apparatus and methods
View Patent ↗Methods for processing a vessel, for example to provide a gas barrier or lubricity, are disclosed. First and second PECVD or other vessel processing stations or devices and a vessel holder comprising a vessel port are provided. An opening of the vessel can be seated on the vessel port. The interior surface of the seated vessel can be processed via the vessel port by the first and second processing stations or devices. Vessel barrier, lubricity and hydrophobic coatings and coated vessels, for example syringes and medical sample collection tubes are disclosed. A vessel processing system and vessel inspection apparatus and methods are also disclosed, for example using material outgassed from a surface to inspect the properties of a surface coating.
1. A method for inspecting the product of a coating process wherein a coating has been applied to at least a portion of the surface of a vessel to form a coated surface, the method comprising:
(a) providing a product of the coating process having a coated surface defined by a coating prepared by PECVD from an organosilicon precursor;
(b) providing a space adjacent to the coated surface that is a lumen of the vessel;
(c) for a test duration of less than 30 seconds, measuring a release characteristic of at least one volatile species into the space adjacent to the coated surface;
(d) identifying the release characteristic of the at least one volatile species from an acceptably coated surface of the inspection object; and
(e) determining whether the release characteristic measured in step (c) satisfies the release characteristic identified in step (d).
2. The method of claim 1 , in which the vessel comprises thermoplastic base material.
3. The method of claim 2 , in which the vessel is an injection-molded thermoplastic part.
4. The method of claim 2 , in which the vessel is a blow molded thermoplastic part.
5. The method of claim 2 , in which the thermoplastic base material comprises a polyester.
6. The method of claim 2 , in which the thermoplastic base material comprises polypropylene.
7. The method of claim 2 , in which the thermoplastic base material comprises a cyclic olefin copolymer.
8. The method of claim 1 , wherein the vessel is a syringe barrel.
9. The method of claim 1 , wherein the vessel is a vial.
10. The method of claim 1 , further comprising drawing at least a partial vacuum on the lumen before measuring the release characteristic.
11. The method of claim 10 , further comprising connecting the lumen via a duct to a vacuum source to at least partially evacuate the lumen.
12. The method of claim 11 , further comprising providing an outgassing measurement cell communicating between the lumen and the vacuum source.
13. The method of claim 11 , in which the lumen is evacuated to a pressure from 0.1 Torr to 100 Torr.
14. The method of claim 1 , further comprising, before measuring the release characteristic, contacting the coating with a gas.
15. The method of claim 14 , in which the gas comprises water vapor.
16. The method of claim 14 , in which the gas comprises oxygen.
17. The method of claim 14 , in which the gas comprises carbon dioxide.
18. The method of claim 1 , in which the release characteristic is measured by determining the volume of material outgassed into the space adjacent to the coated surface per interval of time.
19. The method of claim 1 , in which the release characteristic is measured using micro-flow technology.
20. The method of claim 1 , in which the release characteristic is measured by measuring the mass flow rate into the space adjacent to the coated surface.
21. The method of claim 1 , in which the release characteristic is measured in a molecular flow mode of operation.
22. The method of claim 1 , in which the coating is a barrier layer having a thickness of less than 500 nm.
23. The method of claim 22 , in which the barrier layer comprises SiO x , in which x, the atomic ratio of oxygen to silicon atoms, is from about 1.5 to about 2.9 as measured by X-ray photoelectron spectroscopy (XPS).
24. The method of claim 22 , in which the release characteristic is measured under conditions effective to distinguish the presence or absence of the barrier
25. The method of claim 24 , in which the measurement of the presence or absence of the barrier layer is confirmed to at least a six-sigma level of certainty.