Disadvantages
of Blow Molding
Blow molding is the process in which hollow,
plastic containers are made. Air is blown into molds to form items such as
thermoplastic bottles, tubing and milk jugs. While blow molding allows
companies to manufacture high volumes of plastic containers, which are
significantly cheaper than glass, there are a few disadvantages to the process.
Some disadvantages include environmental hazards and a significant dependence
on petroleum.
Environmental Disadvantages
Plastic products made by the
process of blow molding aren't biodegradable, which presents an obvious
environmental hazard, especially when empty containers find their way to
landfills. When disposed of in landfills, plastic products are buried and
remain in the earth forever. Their oil-based material then becomes part of the
soil and runs the risk of threatening plant life, animals and groundwater.
Dependence on Petroleum
Aside from the gasoline
industry, plastic manufacturers depend on millions of gallons of petroleum in
their quest to produce blow-molded products. Because oil is the most important
agent in thermoplastics and blow molding is becoming more streamlined and
automated, the process plays an ongoing threat on a diminishing world oil
supply.
Process and Material Limitations
Although blow
molding has been automated and can produce mass quantities of products, the
process is largely limited to hollow forms. These forms are delicate and
contain various thicknesses which must be precise, which often results in
wasted material in the process of arriving at containers with proper dimensions
and specifications. In some cases, thermoplastic is stretched to save on
material, which can lead to substandard containers.
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