Sarim Ali Plastic Report template sharing

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1. TECHNOLOGY FINALREPORT.
NAME:Sarim Ali
CLASS:3
RD
YEAR,5
TH
SEMESTER
SEATNO:B1898112
(Improvement)
SUBMITTEDTO:SIRJAVED

2. PLASTICS.
Plasticmaterialsarehighlyformablematerialsthat areartificiallymadefromorganic
compoundscalledpolymers,along withadditivecomponents.Asidefromformability,
plastics are generally known to be lightweight, flexible, durable, corrosion-resistant,
andcost-effective.
Plasticisamaterialconsistingofawiderangeof syntheticor semi-syntheticorganic
compoundsthataremalleable and,therefore,canbe moldedintosolidobjects.
Plasticity is thegeneralpropertyofallmaterialsthatinvolvespermanent deformation
withoutbreaking.
POLYMERIZATION: Apolymeris alargesinglechain-likemoleculeinwhichthe
repeatingunitsderived fromsmallmoleculescalledmonomersareboundtogether.
Theprocess bywhichmonomersaretransformedintoapolymeriscalled
polymerisation.Forexampleethylenepolymerizes to formpolyethylene.
APPLICATION:Productmadefrompolymers areallaroundus:clothingmadefrom
syntheticfibers,polyethylenecups,fiberglass,nylonbearings, plasticbags,polymer-
based paints, epoxy glue, polyurethane foam cushion, silicone heart valves, and
Teflon-coatedcookware.

3. PLASTICMANUFACTURINGPROCESSES.
INJECTION MOLDING: Injection molding is a method to obtain molded
products by injecting plastic materials molten by heat into a mold, and then cooling
and solidifying them. The method is suitable for the mass production of products
withcomplicatedshapes,andtakesalargepartinthe areaofplasticprocessing.
PROCESS: Injection molding is a process in which a thermoplastic polymer is
heated above it’s melting point, resulting in the conversion of the solid polymer into
moltenfluidwithareasonablylowviscosity.Thismeltismechanicallyforced,thatis,
injected, into a mold in the shape of the desired final object. The low viscosity molten
polymer allowscompletefillingof themoldwherethe articleresidesuntilitiscooled
below the freezing point of the polymer. At last, mold is opened and the part is ejected
andrecovered.

4. Amoldis ahollowmetalblockintowhich molten plasticisinjectedtofromacertain
fixedshape.
Moldsaremadeoutofstainlesssteel.CNCmachinesareusedtoembedtextureon
mold.
Injectionmolding isaverycommonprocessintheproductionof
plasticproducts.80%oftheproductsareproducedthrough
injectionmolding. Injectionmoldconsistof 2 parts butbroadly
arecoreandcavity.

5. INJECTION MOLDING MACHINE : The main parts of the Injection molding
machine arematerial hopper, barrel,aninjectionram/rotatingscrewtypeplunger,
heatingdevice(heater),movablepattern,ejectors,andamoldinsidemoldcavity.

6. INJECTIONMOLDINGPRODUCTS:

7. DESIGNCONSIDERATIONS INJECTION MOLDING:
UNDERCUT: Under cutshouldbeavoidedasmuch aspossibleotherwisea
complicatedmoldmayberequiredtoreleasethepartfromthecoreofthemold.
WALL THICKNESS :Therearetwotypesofwallthicknesses;
1:productwallthickness 2: moldthickness
PRODUCT WALL THICKNESS:Productwallthicknessshouldbe maintained. No
sharpedgesinthemold theymustbeinclined upto45degree.
MOLDWALLTHICKNESS:Moldwallthicknesshasanindirectrelation withthe
coolingpoint oftheplastic.Morethewallthickness,moreitwalltaketime togetcool.
Itshouldn’t be90degree,it won’tbe 90degree.Consideration shouldbe draft.
Minimumdraft of1”.

8. KNOCK OUT PINS: It works as piston, pins eject the product of mold. They are
madeupofmetal,steel.Inallthecomplicatedparts,knockoutpinsarepresent.They
arelocatedwith calculations,soit won’teffect theproduct.

9. RIBS:
LETTERING:

10. HOLES:
INSERTS:

11. Blow molding
Blow molding is a manufacturing process used to produce hollow objects from thermoplastic
materials. Here's a brief overview of the process:
Extrusion: The process begins with melting down plastic pellets (typically HDPE, LDPE, PP, etc.) and
extruding them into a hollow tube, known as a parison. This parisonis usually shaped like a test tube
and is hot and pliable.
Molding: The parisonis clamped into a mold cavity, typically made of two halves. One half of the mold
is a hollow cavity that mirrors the shape of the final product. The other half is a solid plate that applies
pressure to the molten plastic.
Blowing: Compressed air is then injected into the parison, causing it to inflate and take the shape of
the mold cavity. The air pressure pushes the plastic against the walls of the mold, ensuring that it
takes on the desired shape.
Cooling: Once the plastic has been blown into the mold cavity and has taken its final shape, it is
allowed to cool and harden. Cooling can be done by circulating air or water through the mold.
Ejection: After the plastic has cooled and solidified, the mold opens, and the newly formed part is
ejected. The excess plastic (known as flash) is trimmed off, and the finished product is inspected for
quality.
Blow molding is commonly used to manufacture items such as bottles, containers, drums, tanks, and
automotive components due to its ability to produce hollow shapes with relatively low cost and high
efficiency. There are different variations of blow molding, including extrusion blow molding, injection
blow molding, and stretch blow molding, each suited to different types of products and production
volumes

13. Compression molding
Compression molding is a manufacturing process used to create plastic or composite parts by
compressing a material in a heated mold cavity. Here's how it typically works:
Preparation: The material to be molded, often in the form of pellets, powder, or preforms, is placed
into the mold cavity.
Heating: The mold is closed, and heat and pressure are applied to the material. The heat softens the
material, making it more pliable and allowing it to conform to the shape of the mold.
Compression: Pressure is applied to compress the material within the mold cavity. This compression
ensures that the material fills the mold completely and uniformly.
Cooling: Once the material has been shaped to the desired form, the mold is cooled to solidify the
material. Cooling times vary depending on the material being used and the complexity of the part.
Ejection: After the material has cooled and solidified, the mold is opened, and the finished part is
ejected. The excess material, called flash, may need to be trimmed off.
Compression molding is often used for producing parts with complex geometries, such as automotive
components, electrical enclosures, and appliance parts. It offers advantages such as high production
rates, low tooling costs (compared to injection molding for some applications), and the ability to mold
large parts. However, it may not be suitable for all materials or part designs, and tooling costs can still
be significant for complex parts

15. Thermoforming molding
Thermoforming molding is a manufacturing process used to shape thermoplastic sheets into specific
forms. It's a versatile method commonly employed in industries such as packaging, automotive,
aerospace, and healthcare to produce a variety of products like trays, containers, packaging, and even
parts for vehicles and aircraft.
Here's how thermoforming molding generally works:
Heating: A flat thermoplastic sheet, usually made of materials like PVC, PET, polystyrene, or acrylic, is
heated until it becomes pliable but not molten.
Forming: The heated sheet is then placed over or into a mold. The mold can be of various materials,
such as aluminum or composite, and can have a single cavity or multiple cavities depending on the
desired product.
Vacuum or Pressure: Once the sheet is in place, vacuum or pressure (or a combination of both) is
applied to force the sheet to conform to the shape of the mold. This ensures that the thermoplastic
material takes on the desired shape and detail.
Cooling: After forming, the mold is cooled, either by air or water, to solidify the thermoplastic
material and maintain its shape.
Trimming: Once the formed part has cooled and solidified, it's removed from the mold and any excess
material is trimmed off to achieve the final desired shape.
Thermoforming offers several advantages, including relatively low tooling costs compared to injection
molding or blow molding, rapid prototyping capabilities, and the ability to produce large parts with
complex geometries. However, it may not be as suitable for high-volume production runs compared
to other molding processes due to longer cycle times.

17. Rotational molding
Rotational molding, also known as rotomolding, is a manufacturing process used for producing hollow
plastic products. It's a versatile technique ideal for creating large, seamless, and complex parts that
are durable and uniform in thickness. Here's a brief overview of how rotational molding works:
Mold Preparation: A hollow mold, usually made of metal, is prepared. It's split into two or more parts
to allow removal of the finished product.
Material Loading: Plastic resin, usually in powdered form, is loaded into the mold. The choice of resin
depends on the desired properties of the final product.
Heating: The mold is slowly rotated in multiple axes within an oven. As the mold rotates, the resin
gradually melts and coats the inner surfaces of the mold, forming a layer.
Cooling: After the resin has completely coated the mold, it is cooled. This can be done by moving the
mold to a cooling chamber or by turning off the heating elements in the oven. Cooling solidifies the
molten resin, forming the desired shape.
Part Removal: Once the part has cooled and solidified, the mold is opened, and the finished product
is removed. Any excess material may need to be trimmed off.
Rotational molding offers several advantages:
Design Flexibility: It allows for the creation of complex shapes and intricate designs without the need
for additional tooling.
Uniform Wall Thickness: The process ensures consistent thickness throughout the part, which is
crucial for structural integrity.

18. Cost-Effectiveness: It can be more economical for producing large, low-volume parts compared to
other molding processes.
Material Variety: A wide range of materials, including various types of plastic resins, can be used in
rotational molding.
This process is commonly used in the production of items such as storage tanks, containers,
playground equipment, automotive components, and even certain types of furniture.

19. TYPESOFPLASTICS.
•THERMOPLASTICS: A thermoplastic,orthermo-
softplastic,isanyplasticpolymermaterialthat
becomes pliable or moldable at a certain elevated
temperature and solidifies upon cooling. Most
thermoplasticshavea highmolecularweight.
•THERMOSET PLASTIC: thermoset is a polymer
thatisobtainedbyirreversiblyhardening asoftsolid
or viscousliquidpre-polymer.Curingis inducedby
heatorsuitableradiationandmay bepromotedby
highpressure,ormixingwithacatalyst.

20. Acrylic:
Acrylicplasticalsoknownasplexiglass,isauseful,clearmaterialthat resembles
glass, butoffers bettertransparencyandweighs50%lessthanglassof equal
thickness.Acrylicis knownas oneoftheclearestmaterials, offeringa transparency
rateof93%andcanbeusedinawidevariety ofapplications.
APPLICATIONS: automotive lights, control knobs, lens, meter cases, pens, hospital
equipments,signboards,lightfittings,skylights,etc.
Polystyrene:
Polystyrene is a versatile plastic used for packaging, insulation, food service items,
disposable utensils, and medical applications. It's lightweight, durable, and insulating.
However, it's criticized for its environmental impact as it's non-biodegradable and
contributes to pollution.

21. HDP:High density polyethylene plastic is most commonly known and referred to
asHDPE sheetplastic. Thisthermoplasticismadefromastringofethylene
molecules (hence, the poly part of polyethylene), and is known for being both
lightweightandstrong.HDPEisflexible,translucent/waxy,weatherproof, goodlow
temperature toughness (to -60'C), easy to process by most methods, low cost, good
chemical resistance.
APPLICATIONS:corrugatedpipes,containers,toys, buckets,etc.
PVC:PolyvinylChloride(PVC)Polyvinylchlorideisathermoplasticsmaterial
whichconsistsofPVCresincompoundedwithvaryingproportionsofstabilisers,
lubricants,fillers,pigments,plasticisersandprocessingaids.
APPLICATIONS:pipes,andfittings,toys,footwares,handbags,wallcoverings,vinyl
sheets,rexine,etc.

22. PP:Polypropylene (PP)isatough,rigid, andcrystallinethermoplastic.Itismade
frompropene(orpropylene)monomer.Thislinearhydrocarbonresinisthe lightest
polymeramongallcommodity plastics.PPcomeseitherasahomopolymerorasa
copolymerandcanbegreatly boostedwith additives.Polypropylene(PP)
is considered to be the safest of all plastics, this is a robust plastic that is heat
resistant.Becauseofitshighheattolerance,Polypropyleneisunlikelytoleacheven
whenexposedtowarmorhot water.Thisplasticisapproved forusewithfoodand
beveragestorage.
APPLICATIONS:carpets, foodcontainers,toys, furniture,pen,etc.
PET:Polyethylene terephthalate, is the most common thermoplastic polymer resin
ofthe polyesterfamilyandisused infibresforclothing,containersforliquidsand
foods,andthermoformingformanufacturing,andincombinationwithglassfibrefor
engineeringresins.Itisgenerallyconsidereda“safe”plastic,anddoesnotcontain
BPA, inthepresence ofheat it canleach antimony,atoxicmetalloid,into foodand
beverages.
APPLICATIONS:mineraloilbottles,edibleoilbottles,photographicfilm,etc.

23. Fiberglass
Fiberglassis a type of reinforced plastic material made up of extremely fine
fibers of glass. It's known for its strength, durability, and versatility. Fiberglass
is commonly used in a wide range of applications, including construction (for
insulation, roofing, and reinforcement), automotive manufacturing (for car
bodies and components), boat building, aerospace industry (for lightweight
structures), and even in consumer products like surfboards and sporting
equipment. Its properties make it resistant to heat, moisture, and chemicals,
and it can be molded into various shapes and forms, making it an ideal
material for many purposes.
LDP:
LDPE(lowdensitypolyethylene)isasoft, flexible, lightweightplasticmaterial.
LDPEisnotedforitslowtemperatureflexibility,toughness,andcorrosion
resistance.