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The flat glass produced by the float glass process has a tin-rich surface due to the contact with

molten tin. The penetration of tin into the glass surface is assumed to involve coupled diffusion of stannous (Sn2+) and stannic (Sn4+) ions. The diffusion

coefficients of these ions were calculated using the modified Stocks–Einstein relation with the oxidation velocity of stannous ions depending on the oxygen

activity in the glass. The ion diffusion was analyzed using a coupled diffusion simulation with a modified diffusion coefficient to compensate for the

negative effect of the glass ribbon’s stretching or compressing in the glass forming process. Tin penetration simulations for both green glass and clear

glass show an internal local tin concentration maximum in green glass which is quite different from that in clear glass. The local maximum in the profile is

associated with the accumulation of stannic ions where the greatest oxygen activity gradient occurs. Since more float time is needed in the manufacture of

thicker glass plate, the tin penetrates to a greater depth with the maximum deeper in the glass and the size of the maximum larger for thicker glass.


    The float glass process, which was originally developed by Pilkington Brothers in 1959 (Haldimann et al., 2008), is the most common manufacturing process

of flat glass sheets. More than 80–85% of the global production of float glass is used in the construction industry (Glass for Europe, 2015a). In the float

glass process, the ingredients (silica, lime, soda, etc.) are first blended with cullet (recycled broken glass) and then heated in a furnace to around 1600°

C to form molten glass. The molten glass is then fed onto the top of a molten tin bath. A flat glass ribbon of uniform thickness is produced by flowing

molten glass on the tin bath under controlled heating. At the end of the tin bath, the glass is slowly cooled down, and is then fed into the annealing lehr

for further controlled gradual cooling down. The thickness of the glass ribbon is controlled by changing the speed at which the glass ribbon moves into the

annealing lehr. Typically, glass is cut to large sheets of 3 m × 6 m. Flat glass sheets of thickness 2–22 mm are commercially produced from this process.

Usually, glass of thickness up to 12 mm is available in the market, and much thicker glass may be available on request. A schematic diagram of the production

process of float glass is shown in Fig. 5.2.The float glass process was invented in the 1950s in response to a pressing need for an economical method to

create flat glass for automotive as well as architectural applications. Existing flat glass production methods created glass with irregular surfaces;

extensive grinding and polishing was needed for many applications. The float glass process involves floating a glass ribbon on a bath of molten tin and

creates a smooth surface naturally. Floating is possible because the density of a typical soda-lime-silica glass (~2.3 g/cm3) is much less than that of tin

(~6.5 g/cm3) at the process temperature. After cooling and annealing, glass sheets with uniform thicknesses in the ~1–25 mm range and flat surfaces are

produced. The ultra clear float glass process is used to produce virtually all

window glass as well as mirrors and other items that originate from flat glass. Since float glass is ordinarily soda-lime-silica, the reference temperatures

and behavior of this glass are used in the discussion below.


    Figure 3.48 shows the basic layout of the clear float glass line. The glass furnace

is a horizontal type, as described above. For a float line, the glass furnace is typically on the order of ~150 ft long by 30 ft wide and holds around 1200

tons of glass. To achieve good chemical homogeneity, the glass is heated to ~1550–1600°C in the furnace, but is then brought to about 1100–1200°C in the

forehearth. From there, the glass flows through a channel over a refractory lipstone or spout onto the tin bath. As it flows, the glass has a temperature of

about 1050°C and viscosity of about 1000 Paradical dots. A device, called a tweel, meters the flow of the molten glass.Imperfections include bubbles (or

‘seeds’) that may have a number of possible sources, the most common being gas evolved during firing. Bubbles may contain crystalline materials formed

during cooling of the glass that may provide clues to the origin of the bubbles. Cords are linear features within the glass that may result either from

imperfectly homogenized raw materials, dissolved refractories or devitrified material. Figure 360 shows the appearance of soda–lime–silica glass that

exhibits bubbles and cords. ‘Stones’ are solid crystalline substances occurring in glass that are regarded as defects. They are usually derived either from

the batch material, refractories, or devitrification. Figure 361 shows the appearance of soda–lime–silica glass that contains a devitrification ‘stone’.

These may develop as the result of incomplete mixing of the molten glass constituents and/or too low a firing temperature. The ‘stone’ shown in Figure 361

contains an aggregation of tridymite crystals (see 362).


    As the floating glass ribbon traverses down the length of the tin bath, its properties change dramatically. The glass enters as a viscous liquid and

exits virtually a solid at a temperature very close to its glass transition temperature. The details of how the temperature changes and the viscosity builds

are complicated. On one side, the free surface of the glass is exposed the atmosphere; heat can leave this surface by radiation or convection. Cooling and

heating apparatuses are stationed above the glass ribbon down the length of the bath to allow adjustment of the ribbon temperature. On the other side, the

glass is in contact with the tin bath, which can absorb some of the heat and transport it away from the ribbon. The tin bath is in constant motion due to the

moving glass above it as well as the thermal convection currents. Unfortunately, no simple approximations can be made to make the modeling of the heat

transfer.


    The thickness of the tinted float glass sheet is adjusted by controlling flow onto

the tin bath as well as by tension exerted along the length of the bath by rollers in the annealing lehr and sometimes by rollers in the bath unit itself. In

the Pilkington design, the melt enters the bath and spreads out laterally to a thickness near the equilibrium value. If a sheet thicker than the equilibrium

is required, then this spreading is constrained with physical barriers. If a sheet thinner than equilibrium is needed. then the glass ribbon is pulled in

tension by rollers. In the PPG design, thickness is regulated by the tweel position and by tension from rollers in the lehr. The thermal profile allows the

thinning deformation to take place effectively. A short distance away from the entry point, the temperature of the ribbon drops and the viscosity rises.

Overhead coolers help this process. The glass viscosity is high enough so that knurled rollers contact the glass ribbon and pull it forward (and in some

operations, laterally as well). Heaters are placed shortly downstream of these edge rollers to raise the temperature of the ribbon and create a deformable

zone. This zone is followed by coolers that again lower the temperature and raise the viscosity. At exit from the lehr, the ribbon is virtually solid. The

main deformation is due to the rollers in the lehr, which pull on the glass ribbon from the lehr to the edge rollers; extension takes place in the

deformation zone. Example 3.15 considers the exit velocity of glass from the process.


    For many years, however, the glass industry has been trying to solve a problem which affects almost every building in the world. How do you maintain the

fundamental characteristics of glass, such as optical clarity and external esthetics without constant and costly maintenance? Whether the building is for

commercial or residential use, the one constant requirement is for regular cleaning to be undertaken to ensure the glass maintains its optimum appearance.


    The challenge for the glass industry is increased as a result of architects finding ever more resourceful and novel uses for glass. The use of glass in

atria and overhead glazing can sometimes result in complex areas, which can make maintenance more difficult.


    In addition to the esthetic issues it is a well-known phenomenon that if glass is not cleaned regularly then over a period of time the glass can weather,

which makes it almost impossible to restore its esthetic properties. In extreme circumstances this can lead to the glass needing replacement.


    The process of cleaning windows can also lead to safety and environmental issues. Window cleaning generally involves the use of portable ladders for

cleaning windows on ground, first, and second floors. Figures for accidents reported to the Health and Safety Executive (HSE) and local authorities reveal

that unfortunately between two and seven window cleaners have been killed every year in Great Britain and around 20–30 suffer major injuries due to falls

involving ladders. From an environmental aspect window cleaning can involve the use of harsh chemicals. These are often washed off during the cleaning

process and can ultimately lead to ground contamination.


    Recently, self-cleaning coatings have been developed, which are designed to reduce the amount of maintenance required by working with the forces of

nature to clean dirt from the glass. These coatings are based on a well-known metal oxide called titanium dioxide, which is regularly used in

paints, toothpaste, and sunscreens.


    Tin is an ideal bath material because it has the right set of physical properties. Tin melts at 232°C, has relatively low volatility, and does not boil

until over 2000°C. Molten tin is denser than molten glass and is not miscible or reactive with molten glass. The gas atmosphere is controlled so that tin

does not oxidize at a fast rate. Any oxide that does form is collected in a dross container on the bath.


   
        Regulating the flow of the wired glass is important at this stage, both from the

entry point and the lateral flow. The glass flow onto the tin bath is regulated by a gate, called a tweel, which is located in the canal between the

forehearth and spout. The glass flows down the spout or lipstone onto the tin surface. There is some pressure driving this flow through the gap of the tweel.

See Example 3.14. As the glass flows onto the tin bath, the thickness of the glass sheet depends on how that flow is controlled laterally and along the

length of the bath. The first step to understanding thickness control is to examine the equilibrium thickness.
   

>http://www.eotechglass.com/processing-glass/wired-glass/

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