Three Canadians--Harry Wasylyk, Frank Plomp and Larry Hansen--made the
first trash bags in 1950. CBC television ranked their invention 36th
among 50 top Canadian inventions. Initially trash bags were called
"green garbage bags" because of their color. These bags were first
launched for commercial use, but beginning in 1960 they were made for
home use as well.
Function
Trash
bags, or garbage bags, have become very popular, owing to their
capacity to hold garbage securely without leakage or spillover. The odor
of the waste material is minimized when it is packed in trash bags.
These bags come in various sizes to hold various amounts of garbage.
They can hold all sorts of litter or food waste without creating a mess.
Raw Materials
Polyethylene
plastic is the most common material used to manufacture trash bags.
Polyethylene was invented in 1942 in the form of small beads. The
process of extrusion then transformed these plastic beads into plastic
bags. Trash bags are made from low-density polyethylene (LDPE), which is
purported to be flexible, soft, airtight and waterproof. At times, to
provide strength to the bags, high-density polyethylene (HDPE) is also
used.
Manufacturing
There are several steps to change polyethylene beads into plastic bags:
1)
Polyethylene beads are heated to 200 degrees C. 2) High pressure is
applied to the molten polyethylene beads to make the plastic flexible.
3) Color is added to make the plastic attractive. 4) Colored plastic is
converted into a large roll of bags. 5) The last step involves cooling
down the bags to be cut and collapsed into various shapes. Finally a
seal is put on them.
Biodegradable Trash Bags
Trash
bags made of plastic are not very eco-friendly, as they take years to
decompose. To address the problem, Canadian chemist Dr. James Guillet
invented biodegradable plastic in 1971. These plastics are remarkable,
as they can decompose when exposed to sunlight, air and moisture.
Another kind of trash bag now being used is the oxo-biodegradable trash
bag. These bags decompose in low temperatures and, once degraded, are
normal waste and do not contaminate the soil. So, these are safer to use
and have overcome the limitations of earlier versions of plastic trash
bags, which could not be readily disposed by processes of
photo-oxidation and thermo-oxidation.
Variety
Some
expensive trash bags have two linings to make them completely
impervious. These bags have an outer waterproof plastic bag with an
inner lining consisting of a sheet of cellulose fluff pulp. These bags
are used for trash with high water content and bad odor. Some trash bags
come with draw strings or wire twist ties to tightly secure the garbage
inside the bag. Plastic trash bags are highly durable and sanitary.
Reliable Paper carries a huge selection of trash can liners and bags. Visit us here to save!
Reliable Paper carries a huge selection of trash can liners and bags. Visit us here to save!
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