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Drainage pipes are vital to many industries and they’re an important component of municipal infrastructure cities use them to prevent streets from flooding and heavy rain forestry companies use them as culverts when building logging roads over streams pipes are often made of plastic this corrugated pipe is made from a type of plastic called high-density polyethylene
Or hdpe the pipe factory combines three varieties of hdpe pellets plain ones recycled ones and pellets with a colorant that provides uv protection the proportions vary depending on the pipes intended use the mixer transfers the pellets to a machine called the extruder it first heats them to about 230 degrees celsius this melts them into a thick liquid then it
Assembles what’s called the corrugator a mold whose cavity is in the shape of corrugated pipe the extruder injects the liquefied hdpe into the corrugator applying vacuum pressure to spread it evenly into all the crevices a built-in cooling system hardens the plastic just enough to set the shape enabling them to extract the pipe from the mold the pipe then passes
Through a cold water shower which hardens the plastic completely the pipe now enters a machine called the perforator which punches holes around the circumference these holes whose size varies by model serve two purposes first they make the pipe lighter and therefore easier to transport and install second they enable water to enter the pipe continually at virtually
Any location then flow to the end and drain out it’s crucial to prevent soil from clogging these holes so this next machine wraps the pipe in a filter cloth made of polyester they don’t want this filter cloth to unravel so the machine heat seals it closed this corrugated polyethylene pipe is finished and ready to be packaged and shipped the packaging line is highly
Automated robotic equipment first coils the length of pipe that the customer ordered then it cuts the end the robots tie the coil at several points so that it doesn’t unravel workers now transfer the coiled pipe to a machine that covers it in plastic stretch wrap this covering will protect the filter cloth until installation time from the damaging effects of dirt
Moisture and light this factory also produces what’s called double wall pipe which has a corrugated outside wall and a smooth inside wall this type of pipe drains more efficiently because water flows faster over a flat surface than over the repeated peaks and valleys of a corrugated one making this type of pipe requires two extruders one to form each wall samples
From every production run go through several quality control tests this compression strength test ensures the pipe won’t buckle under the way to the earth above it high-density polyethylene pipe may be lightweight compared to cement pipe but it’s equally resistant to pressure chemicals and abrasion
Transcribed from video
How Its Made: Corrugated Polyethylene Pipe By HowItsMade
