The document discusses the manufacturing process of polyethylene plastic bags. It describes how polyethylene granules are heated and blown into a bubble through an extrusion process to create thin plastic films. The films are then perforated, cut into bags of varying sizes, folded, and stacked. Key points are that polyethylene is recyclable, flexible, and strong. The manufacturing process transforms polyethylene beads into bags through heating, blowing air into the material to make bubbles, flattening the bubbles into films, and cutting the films into bags.

1. Garbage’s plastics
Tan Lina 2170161
Nur Aina Najiha Binti Abd Manan 2170165
Muhammad Hafiz Bin Mardarza 2170288
Amir Faisal bin Shaiful Azuar 2170201

2. Raw Materials
Polyethylene
༝ Low cost
༝ Recyclable
༝ Flexible
༝ Soft
༝ Higher strength (HDPE)
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Polyethylene granules

3. Manufacturing process (Extrusion)
1. Putting polyethylene granules into large containers or
hoppers. (Color can be added to make the plastic attractive.)
2. Then polyethylene granules are heated to 150-200 degrees C.
3. High pressure is applied to the molten polyethylene beads. Air
is introduced and blown into the polyethylene to create a
bubble to make the plastic flexible.
4. A machine then uses a specialized die to flatten and compress
the bubble.
5. Then the bubble is transformed into a thin film and is
perforated.
6. The thin film is then cut into different bags of varying sizes.
7. The bottom of the bags are separated, and the bags are folded
then stacked.
3
Air is introduced and blown into the
polyethylene

4. Performance of products
 Biodegradable (easy decomposed)
 Good tear resistance (easy to stretch and glossy)
 Aesthetics (colorful)
 fairly light weight
 High dimensional accuracy
 Strength depends on density of polyethylene
 Waterproof (good moisture barrier)
 Air tight
4

5. Cost of products
LDPE 13 cents per pound
HDPE 20 cents per pound
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Raw materials
Process of factory
• 5-8 cents per mass production including additives (coloring & pigments)
Standard pricing: accordance to densities of plastic bags needed, thickness, heavy dutyness of plastics
bags.
Bathroom garbage plastics 4 gallons RM 1.50- RM 2.13 / 30psc
Office garbage plastics 7-10 gallons RM 2.15 / 30psc
Kitchen 12-16 gallons RM 2.25 / 30psc
Public trash plastics 20-25 gallons RM 2.50 / 30psc
Dustbin for accumulated
wastes
30 gallons RM 4.50 / 10psc