ae301 process and procedures
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PUAN.MASELAMAH
PROCESSES AND PROCEDURES
SURESH KUMAR
MOHD FAISAL
AE301:COMMUNICATIVE
ENGLISH 2
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GLASS BOTTLES
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PROCESS AND PROCEDURESAlthough traditional glass-blowing and blow-
molding methods are still used by artists and forcustom applications, most bottle manufacturing isan automated process.
The development of glass bottle machiningpeaked with the advent of feed and flowmachines, which enabled manufacturers togenerate larger production runs than waspreviously possible. Glass production is brokendown into two general categories: containerproduction and sheet production. BOTTLEMACHININg is part of glass container production.
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Bottle manufacturing takes place at a glasscontainer factory in multiple steps. The first stage
of glass-container making begins with the hot
end processes, which typically employ high
amounts of heat to produce and shape a glasscontainer. A furnaceis first used to mold molten
glass, which fed to the furnace as glass feed
stock. Soda-lime glass stock accounts for the
majority (around 90 percent) of glass products,and is typically largely comprised of silica, with
about 10 percent each of calcium oxide and lime
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. Small amounts of aluminum oxide, ferric oxide,barium oxide, sulfur trioxide, and magnesia also
account for about 5 percent of soda-lime glass.
Before melting, cullet (recycled glass) is added to
the stock, accounting for anywhere between 15and 50 percent of the final glass composition.
Once the stock has been fed into the furnace,
temperatures inside can be as high as 1675
degrees Fahrenheit. Next, one of two method
forming methods is applied: press-and-blow or
blow-and-blow.
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Press-and-Blow Press-and-blow formation takes place in an individual
section (IS) machine and is the morecommonly usedmethod in glass-container production. IS machineshave between five and 20 sections, all identical, whichcan each carry out the glass-container forming
process simultaneously and completely. The result isthat five to 20 containers can be produced with onemachine at the same time.
When the molten glass reaches between 1050
and 1200 degrees Celsius it is said to be in itsplastic stage, and it is during this phase thatpress-and-blow formation begins. A shearingblade is used to cut and shape the glass into acylindrical shape, called a gob
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. The cut gob falls, and using gravitational force,rolls through the appropriate passage to reach
the moulds. A metal plunger presses the gob into
the blank mold, where it assumes the moulds
shape and is then termed a parison. Next, theparison is moved into a final mold, where it is
blown into the mould to assume its final
dimensions. This process is typically used for
wide-mouthed glass containers, but can also beused to manufacture thin-necked bottles.
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Blow-and-Blow
Like press-and-blow formation, blow-and-blowtakes place in an IS machine, where a gob is
released during the plastic stage and moved
along to the moulds. However, in blow-and-blow
formation, the gob is forced into the blank mouldusing compressed air to push the gob into place.
The gob, now a parison, is then flipped into a
corresponding final mould where it is blown
again, to form the interior side of the glasscontainer. Glass bottlesof varying neck
thickness can be made using blow-and-blow
formation
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After formation, bottles often undergo internaltreatment, a process which makes the inside of
the bottle more chemically-resistant, an important
factor if the bottles are intended to
hold ALCOHOL or other degrading substances.Internal treatment can take place during formation
or directly after, and typically involves treating the
bottles with a gas mixture of fluorocarbon. Glass
containers can also be treated externally, tostrengthen the surface or reduce surface friction.
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Annealing
Once formation is complete, some bottles maysuffer from stress as a result of unequal cooling
rates. Anannealingoven can be used to reheat
and cool glass containers to rectify stress and
make the bottle stronger.
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Cold End Processes
At this stage in glass production, the bottles orglass containers are inspected and packaged.
Inspection is often done by a combination of
automated and mechanical inspection, to ensure
the integrity of the final product. Common faultsincludechecks (cracks in the glass)
and stones (pieces of the furnace that melt off
and are subsequently worked into the final
container), which are important to catch becausethey can compromise the component. Packaging
methods will vary from factory to factory
depending on the specific type of bottle and the
size of the production run.
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