{"id":4335,"date":"2016-05-02T15:14:45","date_gmt":"2016-05-02T12:14:45","guid":{"rendered":"https:\/\/www.glastory.net\/?p=4335"},"modified":"2024-12-02T15:55:04","modified_gmt":"2024-12-02T13:55:04","slug":"why-there-are-a-lot-of-dots-after-tempering-on-glass-surface","status":"publish","type":"post","link":"https:\/\/www.glastory.net\/pt-br\/why-there-are-a-lot-of-dots-after-tempering-on-glass-surface\/","title":{"rendered":"#AskGlaston Episode 19: Why are there a lot of dots on a glass surface after tempering?"},"content":{"rendered":"<p>This week, we\u2019re dealing with questions about the dots on a glass surface that appeared after tempering and the equipment that can measure the glass flatness:<\/p>\n<blockquote>\n<ol>\n<li style=\"text-align: left;\">We have a furnace made in China and have a lot of dots on the glass surface after tempering. The dots appear only on one side of the glass, the side that has contact with the rollers. Can you give any advice?<\/li>\n<li style=\"text-align: left;\">What type of equipment is used to measure the flatness of the glass in addition to a standard straight-edge ruler?<\/li>\n<\/ol>\n<\/blockquote>\n<p>For this week\u2019s questions, see our full video response below!<br \/>\nAs always, remember to learn, share and succeed!<\/p>\n<p><iframe loading=\"lazy\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/LP9rO9bY6Hk?feature=oembed\" frameborder=\"0\" class=\"lazyload\" allowfullscreen><\/iframe><\/p>\n<h3>We have a furnace made in China and have a lot of dots after tempering on the glass surface. The dots appear only on one side of the glass, the side that has a contact with the rollers. Can you give any advice?<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"size-medium wp-image-4336 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-300x225.jpg\" alt=\"AskGlaston episode 19 dots on glass surface\" width=\"300\" height=\"225\" data-sizes=\"auto\" data-srcset=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-300x225.jpg 300w, https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-768x576.jpg 768w, https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-640x480.jpg 640w, https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19.jpg 960w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><noscript><img decoding=\"async\" loading=\"lazy\" class=\"size-medium wp-image-4336\" src=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-300x225.jpg\" alt=\"AskGlaston episode 19 dots on glass surface\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-300x225.jpg 300w, https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-768x576.jpg 768w, https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19-640x480.jpg 640w, https:\/\/www.glastory.net\/wp-content\/uploads\/2016\/04\/AskGlaston_episode19.jpg 960w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/noscript><\/p>\n<p>As we can see in the picture, those defects are all around the glass. That tells us that there is something happening or some mistakes or errors happening all around the furnace. There are many sources for this kind of challenge.<\/p>\n<p>From the furnace side, it can be that:<\/p>\n<ul>\n<li>The rollers \/ roller surfaces have some fractures.<\/li>\n<li>The insulation from the sides or the roof is coming down in small residual parts, which causes this effect on the glass.<\/li>\n<li>The rollers are vibrating. In this case, please check the quality of the bearings and also that they are installed correctly.<\/li>\n<\/ul>\n<p>When it comes to the loading side, the following aspects need to be considered:<\/p>\n<ul>\n<li>\u2022 It\u2019s essential that the loading side is very clean. It can be, for example, that the first rolls have some friction with the insulation, so the insulation is then taken forward to the furnace, which leads to these mistakes on the glass.<br \/>\n\u2022 It can also be that the glass itself is hitting the inside insulation to cause this.<\/li>\n<\/ul>\n<p>On\u00a0the chiller side:<\/p>\n<ul>\n<li>Air pressure may be blowing through the exit door into the furnace.<\/li>\n<\/ul>\n<h3>What type of equipment is used to measure the flatness of the glass in addition to a standard straight-edge ruler?<\/h3>\n<p>There are a lot of online measurement tools available on the market for the local bow. For example, <a href=\"http:\/\/www.glaston.net\/en\/Products-and-Services\/Glaston-machines\/flat-tempering\/Glaston-iLooK\/\">iLooK<\/a> online quality measurement system measures all the values online when the glass is processed and transferred to the unloading section of the tempering line. Unfortunately, for the overall bow of the glass, there is no reliable automatic online measurement device. A longer straight-edge liner can be used to check the overall bow of the glass.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This week, we\u2019re dealing with questions about the dots on a glass surface that appeared after tempering and the equipment that can measure the glass flatness: We have a furnace made in China and have a lot of dots on the glass surface after tempering. The dots appear only on one side of the glass, [&hellip;]<\/p>\n","protected":false},"author":66,"featured_media":4338,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[11],"tags":[9,102,81,10,194,260,111],"acf":[],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>#AskGlaston Episode 19: Why are there a lot of dots on a glass surface after tempering? &ndash; Glastory<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.glastory.net\/why-there-are-a-lot-of-dots-after-tempering-on-glass-surface\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#AskGlaston Episode 19: Why are there a lot of dots on a glass surface after tempering? &ndash; Glastory\" \/>\n<meta property=\"og:description\" content=\"This week, we\u2019re dealing with questions about the dots on a glass surface that appeared after tempering and the equipment that can measure the glass flatness: We have a furnace made in China and have a lot of dots on the glass surface after tempering. 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