Clean Float Glass Prduction Line With Machinery Of Batch Plant,
Furnace, Tin Batch
1. Brief Description
The name of float glass is because of the glass liquid floating and
forming on a metallic tin liquid surface. By using this forming
method, it is not need to overcome the gravity of the glass, it can
enlarge the width of the glass, improve the speed of stretch, and
increase the capacity and scale of production.
The float glass has a flatness surface, excellent optical
performance, no distortions, due to its good quality, the yield
float glass can be used for deep processing fabrication.
2. Characteristic
Because the glass liquid forms on the metallic tin liquid surface,
it could achieve a high grade double faced fired polishing glass
surface. The parallelism and flatness of float glass are as better
as mechanical polishing effect, but it has a better mechanical
capacity and chemical stability than mechanical polishing glass.
3. Thickness and Application
| Item | Thickness | Application |
| 1 | 2mm, 3mm, 4mm, 5mm, 6mm | Construction |
| Automobile |
| 2 | 2mm, 3mm, 5mm, 6mm | Mirror |
| 3 | 8mm, 10mm | Construction |
| 4 | 12mm | Construction |
| 5 | 15mm | Construction |
| 6 | 19mm | Construction |
4. Raw Materials
Main materials are mainly including:
| Silica Sand |
| Dolomite |
| Limestone |
| Feldspar |
| Soda Ash |
| Salt Cake |
| Cullet |
5. Technical Flow Chart of Float Glass Line
6. Main Equipment Description
6.1 Batch Plant
For batching and mixing the raw materials.
6.2 Furance
The melting tank is key part of glass production line, the
refractory materials quality is very important.
6.3 Tin Bath
Glass liquid float on the metallic tin, through stretching,
forming, polishing and cooling processing, a qualified glass plate
is formed and its temperature reduces around 600°C, the transition
roller will send the plate to annealing lehr.
6.4.Protection Gas Station
In order to overcome the air and oxygen brought through the
entering of the glass liquid and inert gas itself, a center
percentage of hydrogen gas shall be added into nitrogen gas.
Nitrogen gas, a kind of colorless and odorless gas, which is a main
component of protection gas, with a dissociation states in nature.
An inert gas as nitrogen gas, it can not combust in air nor
dissolve in water, which can prevent the oxidization of metallic
tin, and no reaction between nitrogen gas and metallic tin.
Hydrogen gas is a lightest, colorless and odorless combustion gas,
mainly existing under compound state. It is a strong reducing
agent, with min viscosity, high conductivity and strong chemical
activity, which can have chemical reaction with many materials to
produce various kinds of hydride.
Basic Physical and Chemical Characters of Nitrogen and Hydrogen Gas
Nitrogen gas:
| Molecular Mass | 28.02 |
| Density under standard state | 1.251 kg/m3 |
| Critical Property | Temperature | -149.1°C |
| Pressure | 3.39 MPa |
| Density | 310.96 kg/m3 |
| Boiling Point | -195.8 °C |
| Specific Heat Capacity | Cp | 1.047 kJ/kg·°C |
| Cv | 0.745 kJ/kg·°C |
| Thermal Conductivity | 0.233 W/m·k |
Hydrogen gas:
| Molecular Mass | 2.02 |
| Density under standard state | 0.090 kg/m3 |
| Critical Property | Temperature | -239.9°C |
| Pressure | 1.30 MPa |
| Density | 31 kg/m3 |
| Boiling Point | -252.2 °C |
| Specific Heat Capacity | Cp | 12.269 kJ/kg·°C |
| Cv | 10.132 kJ/kg·°C |
| Thermal Conductivity | 9.469 W/m·k |
6.5. Annealing Lehr
In glass technology, annealing means to put the glass into the
annealing lehr for a certain time or reduce the temperature with a
slow speed, so as to no additional permanent stress or temporary
stress will produce. Namely, annealing also means a process which
will reduce or eliminate the thermal stress of glass.
The purpose of glass annealing is to eliminate the internal
residual stress and optical heterogeneity of float glass in order
to stabilize the internal structure of glass.
There are two main processes of float glass annealing:
1. Weaken and eliminate the internal stress.
2. Prevent internal stress from producing.
6.6. Colde-end
It mainly divides into three sections for cold-end part in float
glass production line. Details are following:
- Inspection and pretreatment section
- Cutting and break section
- Stacker and packing section
