Claims
- 1. A method of manufacturing a cone for a display tube comprising the steps:
- recycling screens and cones by crushing them into glass fragments;
- cleaning the glass fragments;
- mixing the glass fragments with other glass-forming components so as to form a glass composition consisting essentially in weight percent,
- ______________________________________ SiO.sub.2 >45 Al.sub.2 O.sub.3 2.0-6.5 Na.sub.2 O 4.5-9.0 K.sub.2 O 4.5-9.0 MgO 0.0-4.0 CaO 0.0-4.0 SrO 1.0-7.5 BaO 3.0-7.5 PbO 16-24______________________________________
- and with a refining agent to form a batch;
- preparing a glass melt from said batch in a glass furnace; and
- pressing said glass melt into a mold for a cone.
- 2. A method as claimed in claim 1, characterized in that the glass fragments of display tube envelopes to be recycled are added to the batch in a quantity ranging from 35 to 50 wt %.
Priority Claims (1)
Number |
Date |
Country |
Kind |
09301352 |
Dec 1993 |
NLX |
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Parent Case Info
This is a division of application Ser. No. 08/352,412, filed Dec. 8, 1994, now U.S. Pat. No. 5,599,752.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0525226 |
Feb 1993 |
EPX |
0538568 |
Apr 1993 |
EPX |
2358648 |
Jun 1975 |
DEX |
Non-Patent Literature Citations (2)
Entry |
Chemical Abstract, vol. 87, No. 22, 28 Nov. 1977, Abstract JP-A-52 068 219. |
Chemical Abstracts, vol. 82, No. 18, 5 May 1975, Abstract JP-A-49 026 051. |
Divisions (1)
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Number |
Date |
Country |
Parent |
352412 |
Dec 1994 |
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