Glass articles made from laminated glass tubing and systems and methods for converting laminated glass tubing into the glass articles
Methods for producing glass articles from laminated glass tubing include introducing the glass tubing to a converter. The glass tubing includes a core layer under tensile stress, an outer clad layer under, and an inner clad layer. The methods include forming a feature the glass article at a working end of the laminated glass tubing and separating a glass article from the working end of the laminated glass tubing, which may expose the core layer under tensile stress at the working end of the glass tubing. The method further comprises remediating the exposed portion of the core layer by completely enclosing the core layer in a clad layer. Systems for re-cladding the exposed portion of the core layer as well as glass articles made using the systems and methods are also disclosed.
1. A glass article comprising:
a laminated glass defining an internal volume, the laminated glass comprising a core layer under a tensile stress, a glass sheet, and at least one clad layer, wherein at least one of the at least one clad layer is under a compressive stress, wherein the core layer is completely enclosed within the glass sheet and the at least one clad layer; and
at least one feature formed in the laminated glass,
wherein the glass sheet comprises a glass ring or disc with a central opening, the glass sheet covering a portion of the core layer within the at least one clad layer, and
wherein the tensile stress in the core layer is greater than or equal to 10 MPa.
2. The glass article of claim 1 , wherein the at least one clad layer comprises an inner clad layer and an outer clad layer and the inner clad layer and the outer clad layer cooperate to enclose the core layer.
3. The glass article of claim 2 , wherein the inner clad layer, the outer clad layer, or both are under compressive stress.
4. The glass article of claim 2 , wherein the inner clad layer comprises an inner glass composition that is classified as a Type I glass under United States Pharmacopoeia (USP)<660>.
5. The glass article of claim 2 , wherein the inner clad layer comprises a borosilicate glass.
6. The glass article of claim 1 , wherein the glass article is a pharmaceutical package.
7. The glass article of claim 1 , wherein the glass article comprises one of a bottle, vial, ampoule, syringe, or cartridge.
8. The glass article of claim 1 , wherein the glass article is a pharmaceutical package adapted to hold a pharmaceutical product, a vaccine, a biologic, or a solution.
9. The glass article of claim 1 , wherein the compressive stress in the at least one clad layer is greater than or equal to 50 MPa.
10. The glass article of claim 1 , wherein the tensile stress in the core layer is greater than or equal to 15 MPa.
11. The glass article of claim 1 , wherein the laminated glass comprises a borosilicate glass.
12. The glass article of claim 1 , wherein a thickness of the at least one clad layer is at least about 30 μm.
13. The glass article of claim 1 , wherein a thickness of the at least one clad layer is from 15% to 25% of an overall thickness of the laminated glass.
14. The glass article of claim 1 , wherein an overall thickness of the laminated glass is less than or equal to 6 mm.
15. The glass article of claim 1 , wherein an overall thickness of the laminated glass is from 0.3 mm to 1.5 mm.
16. The glass article of claim 1 , wherein the core layer comprises a core glass composition different than a glass composition of the at least one clad layer.
17. A product comprising a glass article of claim 1 and a pharmaceutical product, a vaccine, or a biologic contained within the glass article.