Pet blow moulding
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Pet blow moulding

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    Pet blow moulding Pet blow moulding Presentation Transcript

    • PET PLASTIC BLOW MOULDING NOR SUHAILA NOR SAIDI NUR NADIAH AJMAN SITI AMINAH JENIS SITI KHADIJAH ABD RAHMAN SITI NORAINI KAWAEED
    • WHAT IS PET?
      • Known as Polyethylene terephthalate (PET)
      • molecule consists of repeating units
      • white but bluish resin made from terephthalic acid and ethylene glycol through poly-condensation.
      • very important raw material used in man-made fibers.
      • a kind of polyester material for fiber, injection molded parts, as well as blow-molded bottles and jars.
      • (PET) is used to make beverage, food and other liquid containers, synthetic fibers, as well as for some other thermoforming applications.
    •  
    • PROPERTIES AND CHARACTERISTIC
      • Properties:
      • consists of carbon, hydrogen and oxygen.
      • most valuable of the recyclable plastics.
      • reusable as fibre filling for clothing, pallet strapping and moulding, carpeting, as well as in the manufacture of PET containers.
      • Characteristics:
      • Light weight
      • Shatter resistance
      • Economic cost
      • High clarity
      • Resealability
      • Recyclability
    • WHAT IS PET BLOW MOULDING ?
      • Blow moulding is a manufacturing process by which hollow plastic parts are formed out of thermoplastic.
      • A process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold so its shape conforms to that of the mold cavity.
      • The third largest plastic processing technique behind injection molding and extrusion molding.
      • Blow molding has the advantage that molded parts can be manufactured economically in unlimited quantities with little or practically no finishing operations.
      • The plastics normally used in this process are; polythene, PVC and polypropylene.
    • TYPES OF BLOW MOULDING
      • There are three types of PET Blow Moulding Process:
      • Extrusion Blow Molding
      • Injection Blow Molding
      • Stretch Blow Molding
      • But the best known for producing PET bottles is:
      • STRETCH BLOW MOULDING
    • STRETCH BLOW MOULDING
      • Stretch blow molding is best known for producing PET bottles commonly used for water, juice and a variety of other products.
      • Stretch blow molding is divided into two different categories:
      • Single-stage
      • Two-stage
    • SINGLE STAGE STRECTH BLOW MOULDING
      • Uses the extruder to inject parison into a preform mold where the plastic is rapidly cooled to form the preform.
      • The preform is then reheated and placed in the bottle mold.
      • Then softened parison stretches to about twice its original length.
      • Compressed air is then blown into the stretched parison to expand to the bottles mold.
      • Once the bottle is cooled the mold is opened and the finished bottle is emptied from the mold cavity.
      • This technique is most effective in specialty applications, such as wide mouthed jars, where very high production rates are not a requirement.
    • TWO STAGE STRECTH BLOW MOULDING
      • Same as single-stage, except the preforms are already made.
      • The two-stage process uses preforms that have already been made and cooled.
      • The machinery involved injection molds a preform, which is then transferred within the machine to another station where it is blown and then ejected from the machine.
    •    Stretch blow molding: (1) injection molding of the parison; (2) stretching; and (3) blowing.
    • FINAL PRODUCT