It is in the tin trough and the glass floats on the surface of the tin liquid. The principle of manufacturing flat glass by the float system 4 scheme. Flat glass industry trends glass association of north. The present invention provides a tin alloy bath for a float bath, an apparatus for manufacturing a float glass, a method for manufacturing a float glass that can provide a high quality float glass in which defects due to coagulation and falling of a volatile tin component have been suppressed, and a float glass manufactured using those. Technical seminar on nasir glass industries limited joinabazar, sreepur, gazipur, bangladesh. The upstream activities cover producing basic float glass, while the downstream processes describe all activities like. Jul 17, 2014 today, almost all flat glass is made by means of the float process in plants which operate continuously 24 hours a day, 365 days a year for uninterrupted periods of over 15 years. The glass flows out onto the tin surface, forming a floating ribbon with a perfectly smooth glossy surface on both sides. Float glass dominates the sectors output around 95% of total production in europe. The chemical makeup of detergents that may be used in float glass manufacturing can vary significantlysome may contain phosphorus.
The very flat glass you see is generally float glass. The coe of float float glass can vary from 82 to 86 depending on the glass maker and even depending on different production runs from the same glass maker. The ribbon moves to the cold end of the line where it is washed and automatically cut, as it travels along the rollers. Inclusions and optical distortions are being classified. The combustion in the furnace uses air and natural gas. Sep 06, 2016 while each glass plant is different from the other, the float glass production process can be divided into five universal steps. Fourcault process crowns were subsequently replaced by the. The report presents realistic economic, marketing and technical analyses and information based upon an extensive collection of data derived from pertinent glass industry, consumer, service, and governmental sources. Dec 18, 2007 an online defects inspection method for float glass based on machine vision is presented in this paper, and a distributed online defect inspection system for float glass fabrication is realized. Glass production involves two main methods the float glass process that produces sheet glass, and glassblowing that produces bottles and other containers. This process was invented by sir alistair pilkington in 1952 and is the most popular and widely used process that describes how to make glass for architectural purposes in the world today. When an erp in glass manufacturing industry is introduced, every business operations get streamlined and every task turn hassle free. Activities such as production, quality control management, material listing, waste handling etc. All the manufacturing methods involved stretching the molten glass whether by.
From the other, plates of glass emerge, cut precisely to specification, at. China float glass, float glass manufacturers, suppliers. Float glass production is an uninterruptible process. But, behind all these technicalities, there lies a fascinating story of how the perfect technique for float glass manufacturing was discovered. The grinding and polishing of flat glass to produce plate glass have become obsolete since the development of the float glass process. Manitoba, canada float glass project feasibility study. A cutting and scheduling problem in float glass manufacturing. The endproducts in the float process, float glass, are large jumbo sheets of glass typically 6 per 3. A continuous ribbon of molten glass floats along the surface of molten tin. Float glass production continues 24 hours a day, 365 days a year.
Float glass also called flat glass that has not been heatstrengthened or tempered is annealed glass. Tempered glass is about four times stronger than ordinary, or annealed, glass. Home decoration is an art and reveals a lot about the choices and preferences of individuals. Due to the surface tension of the glass and the flat surface of the tin bath, a planeparallel, distortionfree glass ribbon of high optical quality is formed.
Preface ii manufacture of glass chapter 5 presents the bat conclusions as defined in article 312 of the directive. Modeling and simulation of the float glass process kluedo. The grinding and polishing of flat glass to produce plate glass has become obsolete since the development of the float glass process. Ultra thin float glass, ultra thin float glass manufacturer. Sometimes coatings can be applied on the glass at the end or just. During the 1970s, major events like the oil embargo, subsequent fuel shortages and the ensuing economic recession created a new challenge for glass manufacturersincreasing energy efficiency. Runtai clear float glass is superior quality of flat glass having unique characteristics of excellent surface, uniform thickness, high optical clarity and bright appearance.
Watch the magic of this science based process begins to unfold, in a series of stages on a float line that may be. Float glass was introduced into royal float glass production line by luoyang glass factory in late 1970s. Most float glass is sodalime glass, but relatively minor quantities of specialty borosilicate and flat panel display glass are also produced using the float glass process. It is well known fact all over the world that the best quality glass can be produced with the help of the float glass technology. Artisans that use a lot of float glass like to buy full. Aug 06, 2015 glass has emerged as one of the favoured materials in architecture and interior design be it a window, a door, a facade and much more ais, indias leading integrated glass manufacturer, takes you through the complete process of manufacturing of glass in just 6 steps. The float glass process, which was originally developed by pilkington brothers in 1959 haldimann et al. The demand for float glass is, therefore, very much correlated to the growth in these industries. All irregularities are melted out of the ribbon, to give the glass a flat, parallel surface. The float process is different, having a molten tin bath over which the glass is drawn and formed into a finely finished surface requiring no grinding or polishing. This process allows the manufacture of clear, tinted and coated glass for buildings, and clear and tinted glass for vehicles. And unlike annealed glass, which can shatter into jagged shards when broken, tempered glass fractures into small. The inline fault detection for float glass detects any typical glass defects.
The most of the worlds production of float glass produced by the process of float. This method gives the sheet uniform thickness and very flat surfaces. In the float glass process, the ingredients silica, lime, soda, etc. The following are the origin, characteristics and manufacturing process of float glass. The float glass process is one of the most stable manufacturing processes in the world. Specification length 50 m width 34 m depth 6 cm entering temperature 1100oc exit temperature 600oc 16. An online defects inspection method for float glass. In a batch process, all raw materials are added at one time, as opposed to being continually fed into a furnace. During the float glass manufacturing process, glass sheets are exposed to a so 2 atmosphere near the glass transition temperature t g upon entering the annealing lehr 17, 18. Most float glass is sodalime glass, although relatively minor quantities of specialty borosilicate. Stepbystep manufacturing of float glass watch the magic of this sciencebased process begins to unfold, in a series of stages on a float line that may be nearly half a kilometre long. Fpi float vision equips process control with high transparency and an almost complete product analysis. The float process is a standardised production process used by all european float glass manufactures.
And this is basically the principle on which the float glass manufacturing process is based. Us20180009695a1 method for manufacturing float glass. Broadly, modern glass container factories are threepart operations. In this article, we have seen the step by step production of the float glass manufacturing production process.
Check out kog rolling glass for sheet glass and other glass uses. The float glass process is used to make highquality, flat glass for the construction and automotive industry. The glass float glass as we know is manufactured by the ppg process. The flat glass produced by the float glass process has a tinrich surface due to the contact with molten tin. Feb 16, 2001 float glass is manufactured using a melt process, where recycled glass, silica sand, lime, potash and soda are melted in a furnace and floated onto a bed of molten tin. Oct 28, 2016 float glass manufacturing process armor global. Glass production facilities must report the following. The stepbystep manufacturing of float glass watch the magic of this sciencebased process begins to unfold, in a series of stages on a float line that may be nearly half a kilometre long. Tactical level planning in float glass manufacturing with co. Once the glass is melted, a portion of the glass is removed from the melting vessel and is formed into a product.
Float glass is manufactured using a melt process, where recycled glass, silica sand, lime, potash and soda are melted in a furnace and floated onto a bed of molten tin. The fascinating story behind float glass manufacturing. Introduction in the history of glass technology the float process marks a revolutionary step for the flat glass manufacture 1. The glass is melted in a single vessel or furnace, which is sometimes called a day tank. The continuous glass ribbon is then carried on rollers through an annealing lehr, machinecut according to customer size requirements, and ooaded for distribution. While each glass plant is different from the other, the float glass production process can be divided into five universal steps. Molten glass flows onto the surface of molten tin in a continuous ribbon bath. Annealed glass can be cut, machined, drilled, edged and polished. Iron behaviour in the float glass manufacturing process. You can only trust it to be compatible if you use only glass from the same original sheet but not if you mix pieces from different sheets. Considerable care has been taken to ensure that all input data and assumptions are.
The main components, namely, soda lime glass, silica sand 73%, calcium oxide 9%, soda % and magnesium 4%, are weighed and mixed into batches to which recycled glass cullet is added. The float process step by step pilkington first in glass. In 1903, the american window glass company developed a method for the mechanical blowing of cylinders many times larger than hand blown cylinders. The major raw materials required for manufacturing of glass bottles and tumblers are silica, limestone, soda ash an d cullet. Glass producers are facing permanently increasing demands, requiring an absolutely stable production process. The industry responded with a range of innovative products that increased. Production of glass bottles video production cameraman peter scheid vietnam duration.
On the molten tin the glass mass floats in the form of an endless band. The ribbon moves to the cold end of the line where it is washed and automatically cut. Flat glass manufacturing is a continuous process whereby a ribbon of molten glass is produced in a furnace and then cooled on a bath of molten tin to ensure atness. Disclosed is a top roller wherein it is difficult for a coolant water duct to become narrowed or obstructed, and which operates appropriately over the long term. Sodalime glass consists of sand, limestone, soda ash, and cullet broken glass. Brothers in england developed the float glass process, in which a continuous 3. It is not possible to stop the glass furnace that melts raw materials to produce liquid glass. Float glass production of flat glass in a float glass process q question a answer situation analysis 1100c 2012f hot molten glass is fed into the float bath tin bath. Presentation on glass manufacturing linkedin slideshare. Wo2010147189a1 top roller, float glass production device. It is considered by glass specialists that process of producing flat glass is divided into an upstream and downstream process center for european policy studies, 2014. Cut glass is then stacked for shipping to customers, coating or laminating. Float glass manufacturingproduction process ceramic ninja. The sheets of float glass can now be directed to another part of the plant where one side undergoes very hightech treatment.
Use of sulfur dioxide in chinese floatglass production lines. Float glass is, therefore, one of the most basic forms of architectural glass and can be processed further to yield functional variants of glass such as tempered glass and laminated glass. Glass sheet automatic plant, glass sheet, flat glass. Peter scheid, cameraman ho chi minh city vietnam 193,812 views 6. The molten mass solidifies slowly while flowing over the bed of molten tin, after which it is annealed to remove stresses induced during the cooling process. Jun 19, 2015 tin bath molten glass from furnace is fed into in bath.
The float process technology is the basis of all modern glass production, it also widely used for the production of glass bottles. The liquid glass is added to the float bath of liquid tin. This method inspects defects through detecting the change of image gray levels caused by the difference in optic character between glass and defects. From the other, plates of glass emerge, cut precisely to specification, at rates as high as 6,000 tonnes a week. In the float glass process, molten glass is fed onto a.
The basic principle of the float glass process is to mix the raw materials, melt them in the furnace and pour the molten glass onto a bath of molten tin. Float glass, optics, float process, glass surface, glass corrosion 1. In blowing and pressing, pollutants in effluents are. After the tin bath it is cooled and annealed in a lehr becoming flat glass. O emissions from fuel combustion at each continuous glass melting furnace.
Other articles where floatglass method is discussed. The top roller is used for restraining the contraction of a molten glass ribbon within a float bath, contacts the aforementioned molten glass ribbon, has a rotatable end, said end having a hollow structure with an end space inside. This is only possible, using advanced quality and process control methods. The float glass process 3 sheet or window glass production was first mechanized on a large scale in the early part of this century. Since its introduction in 1959 by pilkington, the float process has substantially replaced the plate and drawn sheet process worldwide. I n addition to raw materials, auxiliary m aterials like include. The glass manufacturing principle is overall same in different types of glass except one or two. Pdf the article deals with improving the quality of the cut flat glass. You have a huge variety of products to experience with such as china float glass listed above and its similar choices.
Advances in thin glass manufacture and in coatings are opening new opportunities in electronics. There are no waves and distortion in the sheet glass manufacturing with the help of float glass technology, is. My subject is the float process for making flat glass. The chemical makeup of detergents that may be used by float glass manufacturing could vary significantlysome could contain phosphorous in hand blown and pressed glass, pollutants in. In the case of float glass manufacturing, it is carried out through some regular steps, the. Pdf improving the quality of cutting flat glass researchgate. The float process, invented by sir alastair pilkington in 1952, makes flat glass. Annealing float glass is the process of controlled cooling to prevent residual stress in the glass and is an inherent operation of the float glass manufacturing process. Stage 1 has one machine and stage 2 has m identical parallel machines.
Based on our comprehensive knowhow in float glass furnace design, horn, together with our glass producing partners throughout the world, handles the complete project management of float glass facilities, this from planning right through to final commissioning. In reality in the float glass process, the temperature strongly influences the. Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and other various lowmeltingpoint alloys were used in the past. There are 4 key stages involved in a glass manufacturing process melting and refining. The float process, invented by sir alastair pilkington in 1959, is used throughout the world to produce high quality glass for buildings and vehicles. Jul 01, 2016 the float glass process is used to make highquality, flat glass for the construction and automotive industry. The penetration of tin into the glass surface is assumed to involve coupled diffusion. When heated to about 1500 degrees celsius c this becomes a molten mass that hardens when slowly cooled. The technology of producing of bottle glass consists of two production cycles. Stepbystep manufacturing of float glass stepbystep. Float glass process an overview sciencedirect topics. Pdf the manufacturing of glass bottles and tumblers from.
383 1001 791 799 583 257 22 1468 532 557 1490 959 330 326 894 471 470 366 1228 816 345 1203 479 842 335 186 661 1200 691 32 364 1055 580 995 1096 228 17 1132 865 498 1186 750 1101 1118