Plastic bags and other plastic garbage thrown into the - PowerPoint PPT Presentation

Loading...

PPT – Plastic bags and other plastic garbage thrown into the PowerPoint presentation | free to download - id: 3d1686-Nzk4Y



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Plastic bags and other plastic garbage thrown into the

Description:

* Plastic bags and other plastic garbage thrown into the ocean kill as many as 1,000,000 sea creatures every year! * Americans throw away 25,000,000 plastic beverage ... – PowerPoint PPT presentation

Number of Views:149
Avg rating:3.0/5.0
Slides: 29
Provided by: course1Wi1
Category:
Tags: bags | garbage | plastic | thrown

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Plastic bags and other plastic garbage thrown into the


1
Recycling of Plastics
2
Did you know...
  • Plastic bags and other plastic garbage thrown
    into the ocean kill as many as 1,000,000 sea
    creatures every year! Americans throw away
    25,000,000 plastic beverage bottles every
    hour! Recycling plastic saves twice as much
    energy as burning it in an incinerator.
    Americans throw away 25,000,000,000 styrofoam
    coffee cups every year.

3
The History of Plastics
4
Plastics are a subgroup of polymers
  • Plastics consist of polymeric molocules that are
    long continuous chains.
  • Polymer a substance that contains very long
    chains with the same structural unit repeating
    over and over again.

5
Types of Plastics
Thermosets
1
Elastomers
2
3
Thermoplastics

6
Thermosets
  • Characteristics and applications
  • hard and have a very tight-meshed, branched
    molecular structure.
  • Curing proceeds during shaping, after which it
    is no longer possible to shape the material by
    heating.
  • i.e. Thermosets are used for making light
    switches.

7

Elastomers
  • Characteristics and applications
  • have a cross linked structure but they have a
    looser mesh than thermosets, giving rise to a
    degree of elasticity.
  • Once shaped, elastomers also cannot be reshaped
    by heating.
  • i.e. producing automobile tires.

8
Thermoplastics
  • Characteristics and applications
  • linear or branched molecular structure which
    determines their strength and thermal behavior
    they are flexible at ordinary temperatures.
  • At approx. 120 - 180C, thermoplastics become a
    pasty/liquid mass. The service temperature range
    for thermoplastics is considerably lower than
    that for thermosets.

9
Plastic Recycling Codes
  • Polyethylene Terephthalate (PET, PETE)
  • High Density Polyethylene (HDPE)
  • Vinyl (Polyvinyl Chloride or PVC)
  • Low Density Polyethylene (LDPE)
  • Polypropylene (PP)
  • Polystyrene (PS)
  • Other

10

Polyethylene Terephthalate (PET, PETE)
  • Description
  • Thermoplastic
  • ?clear, tough, good gas/moisture barrier
    properties
  • Examples
  • ?soft drink bottles
  • ?molded consumer product containers

11
High Density Polyethylene (HDPE)
  • Description
  • Thermoplastic
  • Stiffness, strength, toughness, resistance to
    chemicals and moisture, permeability to gas, ease
    of processing, and ease of forming.
  • Examples Milk, water, juice, cosmetic, shampoo,
    dish and laundry detergent bottles yogurt and
    margarine tubs cereal box liners grocery, trash
    and retail bags.

12

Vinyl (Polyvinyl Chloride or PVC)
  • Description
  • Thermoplastic
  • Versatility, clarity, ease of blending,
    strength, toughness, resistance to grease, oil
    and chemicals.
  • Examples Packaging, loose-leaf binders, decking,
    paneling, gutters, mud flaps, film and sheet,
    floor tiles and mats, resilient flooring,
    cassette trays, electrical boxes, cables, traffic
    cones, garden hose, mobile home skirting.

13
Low Density Polyethylene (LPE)
  • Description
  • Thermoplastic
  • Ease of processing, strength, toughness,
    flexibility, ease of sealing, barrier to
    moisture.
  • Examples Shipping envelopes, garbage can liners,
    floor tile, furniture, film and sheet, compost
    bins, paneling, trash cans, landscape timber,
    lumber

14
Polypropylene (PP)
  • Description
  • Thermoplastic/Thermoset
  • Strength, toughness, resistance to heat,
    chemicals, grease and oil, versatile, barrier to
    moisture.
  • Examples Automobile battery cases, signal
    lights, battery cables, brooms, brushes, ice
    scrapers, oil funnels, bicycle racks, rakes,
    bins, pallets, sheeting, trays.

15
Polystyrene (PS)
  • Description
  • Thermoplastic/Elastomer
  • Versatility, insulation, clarity, easily formed
  • Examples Thermometers, light switch plates,
    thermal insulation, egg cartons, vents, desk
    trays, rulers, license plate frames, foam
    packing, foam plates, cups, utensils

16
Other
  • Description Dependent on resin or combination of
    resins
  • Examples Bottles, plastic lumber applications.

17
Plastic structures
  • http//www.assumption.edu/users/bniece/olympiad/Po
    lymers/PolymerFacts.pdf

18
The different types of plastics produced and the
amount recycled
19
The manufacturing techniques of recycling plastic
  • Extrusion
  • Injection moulding
  • Blow moulding
  • Film moulding

20
Extrusion
  • The reclaimed plastic is forced along the heated
    tube by Archimedes screw and the plastic polymer
    is shaped around a die. The die is designed to
    give the required dimensions to the product and
    can be interchanged.

21
Injection Moulding
  • The first stage of this manufacturing process is
    identical to that of extrusion, but then the
    plastic colony emerges through a nozzle into a
    split mold. This type of production technique is
    used to produce molded products such as plates,
    bowls, buckets etc

22
Blow Moulding
  • Again the spiral screw forces the plasticized
    polymer through a die. A short piece of tube, or
    parison is then enclosed between a split die
    which is the final shape of the product-and
    compressed air is used to expand the parison
    until it fills the mold and achieves its final
    shape.

23
Film Moulding
  • A process used to manufacture such items such as
    garbage bags. The process involves blowing
    compressed air into a thin tube of polymer to
    expand it to the point where it becomes a thin
    filmed tube. One end can then be sealed and the
    bag or sack is formed.

24
RECYCLING IN U.S. COMMUNITIES
RURAL More likely drop-off or no program C/S
half frequency of Suburban SUBURBAN C/S or
both common Few have no program or D/O
only URBAN Many with both C/S D/O
25
Winona Recycling for the year 2003
  • Plastic Tons
  • Film Plastic 33
  • HDPE 81
  • Mixed Plastic 244
  • Other Plastic 53
  • Polystyrene 43

26
Some last and final thoughts
  • The History of Plastics
  • Types of plastics Thermosets. Elastomers,
    Thermoplastics
  • Plastics recycling resin codes PETE, HDPE, PVC,
    LDP, PP, PS
  • Manufacturing techniques of Recycling Extrusion,
    Injection moulding, Blow moulding, and Film
    moulding
  • Recycling statistics on the U.S. and here in
    Winona

27
Save the planet
  • RECYCLE REDUCE RE-USE

28
Works Cited
  • Hoyle, W., Karsa, D.R. (1997). Chemical Aspects
    Of Plastics     Recycling. Cambridge, UK The
    Royal Society of Chemistry.
  • (2005). American Plastics Council.org. Retrieved
    January 23,     2003 from Web site    
    http//www.americanplasticscounsil.org/s_apc/index
    .asp
  • Ehrig, Dr. Ray (1997). Information To Grow The
    Plastics Recycling     Industry (4th ed.).
    Chicago, Illinois Society of Plastics    
    Engineers.
  • (2005). Plastic ID Code/Plastic Bottle
    Properties. Retrieved     March 23, 2005 from
    Kenplas Industry Limited Web site    
    http//www.kenplas.com/topic/recyclelogo/
  • (2004, September). Plastics Recycling
    Information Sheet.     Retrieved March 23, 2005
    from The Wastline Information Team Web    
    site     http//www.wastelineonline.org.uk/resou
    rces/InformationSheets/Plastics.htm
  • (2005). Recycling Plastics. Retrieved March 23,
    2005 from Technical Brief
  • http//www.itdg.org/docs/technical_informatio
    n_service/recycling_plastics.pdf
  • (1999, November 05). Fun Recycling Facts.
    Retrieved March 23, 2005
  • The Resourceful Schools Project is funded by the
    St. Louis County Department of Health in
    association with Cooperating School Districts and
    MERP. http//www.resourcefulschools.org/html/facts
    .html
About PowerShow.com