FAQ

Black HDPE pipe withstands UV the best.

Yes, except for fluorescent colors, Sun Rise can do over 180 colors in RAL Classic Color K7.

The production of HDPE pipes is mainly completed through the extrusion molding process, which usually involves the following 8 steps. Sun Rise is the largest HDPE pipe factory in Taiwan, and all machines used are originally from Austria. Compared with machines imported from China that are common in the Taiwan market, Austrian machines produce faster, more environmentally friendly, and more stable.

A. Material preparation:
HDPE particles are used as the main raw material, and color masterbatches are sometimes added to produce other colors.

B. Auto-feeding:
HDPE particles enter the auto-feeding section of the extrusion machine.

C. Melting:
In the extrusion machine, HDPE particles are gradually heated and melted, forming a uniform flow of molten plastic. The heating zone of the extrusion machine is usually divided into multiple temperature zones, and each temperature zone is controllable to ensure uniform melting of HDPE.

D. Extrusion and forming:
HDPE is extruded from the molding on the extrusion machine to form a tubular shape. The shape and size of the molding determine the outer diameter and wall thickness of the pipe.

E. Vacuum forming and cooling:
The pipe passes through a vacuum forming device to rapidly cool down and take shape. There is cooling water in the device, which can quickly cool the pipe to ensure dimensional stability and roundness.

F. Traction:
After cooling and shaping, the pipe is pulled out by a tractor to ensure that the pipe passes through the entire production line at a uniform speed to avoid stretching or shrinking.

G. Cutting:
Then the pipe is cut to the required length by an automatic cutting device.

H. Inspection & Packing:
Finally, the pipes need to undergo quality inspection, including size, wall thickness, appearance, etc., to ensure compliance with standards. Qualified pipes will be packaged and ready to be shipped.

HDPE pipes are used in many applications because they are more resistant to acid and alkali corrosion than iron pipes or PVC pipes, have higher flexibility and are not easy to break. HDPE pipes are light in weight, environmentally friendly and can be fully recycled, have low water flow resistance, high transportation efficiency. No leaking risk when welded together, also they have a service life of more than 50 years, so they’re widely used, especially in water supply, drainage and gas delivery systems.

Anti-corrosion:
HDPE pipe: has excellent corrosion resistance, can resist a variety of chemicals, and is not easily corroded by acids, alkalis and salts.
Iron pipes: prone to rust and corrosion and require frequent anti-corrosion treatment.
PVC pipe: corrosion resistance is also very good, but it may not be as good as HDPE pipe in certain kinds of chemicals.

Flexibility:
HDPE pipe: has high flexibility, can remain intact during earthquakes, and is not easy to break.
Iron pipe: has high rigidity, but lacks flexibility and is easy to break under external force.
PVC pipe: compared with HDPE pipe, less flexible and easy to break.

Light in weight:
HDPE pipe: light in weight, low installation and transportation costs, and easier installation.
Iron pipe: heavy in weight, high transportation and installation costs. It requires the use of special equipment.
PVC pipe: Also lighter in weight, but usually slightly heavier than HDPE pipe.

No leaking risk:
HDPE pipe: welding technology can be used to ensure the strength and sealing of the joint and almost no leakage.
Iron pipes: usually use threaded or flanged joints, which may cause leakage risks.
PVC pipes: usually sealed with glue or rubber rings, the joints may age with time and cause water leakage.

Durability:
HDPE pipe: long service life, usually more than 50 years.
Iron pipes: The service life is greatly affected by corrosion and usually requires regular replacement or maintenance.
PVC pipes: have a relatively long lifespan but may age with exposure to sunlight and high temperatures.

Eco-friendliness:
HDPE pipe: recyclable and has less impact on the environment.
Iron pipe: can also be recycled, but the production process may have a greater impact on the environment.
PVC pipe: the recycling rate is relatively low, and harmful substances may be produced during processing.

Transportation efficiency:
HDPE pipe: The inner wall is smooth so the water flow resistance is small, and the transportation efficiency is high.
Iron pipe: The inner wall may be rusted, which increases the chance of blocking water flow and affects the transportation efficiency.
PVC pipe: The inner wall is also relatively smooth, but may not be as good as HDPE pipe.