Capabilities
A 12,000 m² plant in Jiangbei District, Ningbo, with 105 people. Below is the route a heat exchanger takes through it, photographed as it happens.
How a coil is made
Eleven stages, from a reel of copper tube to a packed coil on a pallet.
- 01
Tube bending
Copper tube is uncoiled, straightened, cut and bent into hairpins.
- 02
Fin stamping
A press line stamps the fin pattern and collars into aluminum foil at the pitch on the drawing.
- 03
Fin insertion
Hairpins are laced through the fin stack by hand and the tube count is checked.
- 04
Tube expansion
The tubes are expanded mechanically so that they press against the fin collars.
- 05
Cleaning and drying
Oil from stamping and expansion is removed and the coil is dried in an oven.
- 06
Coil bending
Where the drawing asks for it, the flat coil is bent into an L or U shape.
- 07
Brazing
Return bends and headers are brazed to close the refrigerant circuits.
- 08
Leak testing
Every coil is pressurized to 3.8 MPa and checked for leaks.
- 09
Final inspection
Inspectors check finished units and record the results.
- 10
Packing
Coils and units are protected and packed for export.
- 11
Ready to ship
Packed goods wait in the dispatch area for loading.
Between brazing and packing, coils are also blown clean with air and the fins are combed straight.
What goes in
The two materials every coil starts from.
Other workshops
Cold boxes and refrigeration units are built on the same site.
See it for yourself.
Visit the plant in Ningbo, or ask for a live video call from the production floor.