Method and apparatus for making vacuum insulated glass (VIG) window unit including pump-out tube sealing technique
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03B-029/02
E06B-003/677
E06B-003/66
출원번호
US-0474819
(2012-05-18)
등록번호
US-8833105
(2014-09-16)
발명자
/ 주소
Dennis, Timothy A.
Pantke, Andrew W.
출원인 / 주소
Guardian Industries Corp.
대리인 / 주소
Nixon & Vanderhye P.C.
인용정보
피인용 횟수 :
6인용 특허 :
8
초록▼
A method for making a vacuum insulated glass window assembly is provided in which an exposed end of a pump-out tube of a vacuum insulated glass window assembly is sealed using a laser that is applied to the end of the pump out tube in controlled sequential manner as opposed to a short duration, high
A method for making a vacuum insulated glass window assembly is provided in which an exposed end of a pump-out tube of a vacuum insulated glass window assembly is sealed using a laser that is applied to the end of the pump out tube in controlled sequential manner as opposed to a short duration, high-powered application of a laser. In particular, a method is disclosed in which a multiphase sequential variable power application of laser energy to an exposed end of a pump-out tube for controlled exposure times and decreasing laser trace diameters produces a more controlled melting of the tube glass to reduce or eliminate undesirable outgassing that may occur during a high-power short duration exposure of laser energy to the end of the pump-out tube to seal the tube.
대표청구항▼
1. A method of making a vacuum insulated glass window unit, the method comprising: having a first substrate with a pump-out tube disposed in a hole formed in the first substrate; a second substrate; and an edge seal, the first and second substrates arranged to sandwich the edge seal and form a cavit
1. A method of making a vacuum insulated glass window unit, the method comprising: having a first substrate with a pump-out tube disposed in a hole formed in the first substrate; a second substrate; and an edge seal, the first and second substrates arranged to sandwich the edge seal and form a cavity therebetween;sealing an end of the pump-out tube extending out of the first substrate, the sealing comprising: (i) performing at least one preheating treatment at a top of the pump-out tube and to begin heating the top of the pump-out tube; (ii) after said pre-heating, performing at least one core heating treatment to melt the top of the pump-out tube; and (iii) performing a plurality of chase treatments using successively reduced laser trace diameters to seal the pump-out tube. 2. The method of claim 1, further comprising evacuating the cavity between the first substrate and a second substrate to a pressure less than atmospheric pressure using the pump-out tube prior to said sealing. 3. The method of claim 1, wherein the sealing steps (i), (ii) and (iii) are performed using a laser. 4. The method of claim 1, wherein the sealing steps (i), (ii) and (iii) are performed with a YAG laser. 5. The method of claim 1, wherein the preheating treatment comprises applying a laser beam in a generally circular trace having a diameter of about 0.135 mm for about 8 to 12 repetitions and at a power of from about 14-18 W; said core treatment comprises applying the laser with a trace diameter of about 0.135 mm for about 60-80 repetitions and at a power of form about 10-14 W; andsaid plurality of chase treatments comprise: a first chase treatment applying the laser with a trace diameter of from about 0.10 to 0.14 mm for about 25-35 repetitions at a power of about 10-14 W; a second chase treatment applying the laser with a trace diameter of about 0.05 to 0.2 mm for about 10-30 repetitions at a power of from about 8-12 W; and a third chase treatment applying the laser with a trace diameter of from about 0.06 to 0.1 mm for about 3-10 repetitions at a power of from about 8-12 W. 6. The method of claim 5, wherein a laser movement speed is about 25 inches/sec. 7. The method of claim 1, wherein the preheating treatment comprises: a first preheating treatment applying the laser in a generally circular trace having a diameter of about 0.1 to 0.2 mm, for about 75-125 repetitions at a power of from about 6-10 W; and a second preheating treatment applying the laser with a smaller trace diameter of from about 0.08 to 0.150, for about 4-10 repetitions at a power of from about 14-18 W; said core treatment comprises: applying the laser with a trace diameter of from about 0.1 to 0.2, for about 20-60 repetitions at a power of from about 10-14 W; andsaid plurality of chase treatments comprise: a first chase treatment applying the laser with a trace diameter of from about 0.1 to 0.2 mm, for about 10-30 repetitions at a power of from about 8-12 W; a second chase treatment applying the laser with a smaller trace diameter of from about 0.08-0.15, for about 5-15 repetitions at a power of about from about 6-10 W; and a third chase treatment applying the laser with a still smaller trace diameter of from about 0.05 to 0.09 mm, for about 3-10 repetitions at a power of about 4-8 W. 8. The method of claim 7, wherein a laser movement speed is about 25 inches/sec. 9. The method of claim 1, wherein the preheating treatment comprises: applying the laser in a generally circular trace having a diameter of about 0.135 mm for about 200 repetitions at a power of about 6 W; said core treatment comprises: applying the laser with a trace diameter of about 0.135 mm for about 90 repetitions at a power of about 10 W; andsaid plurality of chase treatments comprise: a first chase treatment applying the laser with a trace diameter of about 0.12 mm for about 20 repetitions at a power of about 8 W; a second chase treatment applying the laser with a trace diameter of about 0.1 mm for about 10 repetitions at a power of about 7 W; and a third chase treatment applying the laser with a trace diameter of about 0.08 mm for about 5 repetitions at a power of about 6 W. 10. The method of claim 9, wherein a laser movement speed is about 25 inches/sec. 11. The method of claim 1, wherein the preheating treatment comprises: applying the laser in a generally circular trace having a diameter of about 0.135 mm for about 200 repetitions at a power of about 6 W; said core treatment comprises: applying the laser with a trace diameter of about 0.135 mm for about 70 repetitions at a power of about 12 W; andsaid plurality of chase treatments comprise: a first chase treatment applying the laser with a trace diameter of about 0.12 mm for about 20 repetitions at a power of about 8 W; a second chase treatment applying the laser with a trace diameter of about 0.1 mm for about 10 repetitions at a power of about 7 W; and a third chase treatment applying the laser with a trace diameter of about 0.08 mm for about 5 repetitions at a power of about 6 W. 12. The method of claim 11, wherein a laser movement speed is about 25 inches/sec. 13. A method of making a vacuum insulated glass window unit, the method comprising: sealing an end of a pump-out tube extending out of a first substrate of the vacuum insulated glass window unit, the sealing comprising:performing at least one preheating treatment;performing at least one core heating treatment; andperforming a plurality of chase treatments using successively reduced laser trace diameters. 14. The method of claim 13, further comprising evacuating a cavity formed between the first substrate and a second substrate of the vacuum insulated glass window unit to a pressure less than atmospheric pressure via the pump-out tube prior to the sealing. 15. The method of claim 13, wherein the sealing is performed using a laser. 16. The method of claim 13, wherein the sealing is performed using a 20 W YAG laser. 17. The method of claim 13, wherein said preheating treatment cleans a top of the pump-out tube and begins heating the top of the pump-out tube. 18. The method of claim 13, wherein said core treatment begins melting of a top of the pump-out tube. 19. The method of claim 13, wherein the chase treatments seal the end of the pump-out tube. 20. The method of claim 13, wherein the pump-out tube is not melted during the preheating treatment.
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