Supporting column and cassette using the same

A cassette for accommodating a plurality of substrates in mutual isolation, comprising:

• a pair of frames having a plurality of threaded holes in the opposite edges of the frames, and
• at least two pair of supporting columns fixed to the frames, each supporting column comprising:
• a main body having a C-shaped cross section and defining an axial bore along an axial direction, and
• a stiff shaft being received in the axial bore,
• wherein the main body comprises a half-sleeve shaft and a plurality of parallel wing panels encircling portions of the half-sleeve shaft, and each wing panel provides a protrusion in the middle of the wing panel.

A cassette comprising:

• two rows of columns arranged opposite to each other;
• each of said supporting column including a tubular main body defining a bore along an axis direction;
• a stiff shaft being received in said bore with two ends of said stiff shaft extending out of two opposite ends of the main body and retained in two corresponding stopper members, respectively;
• and
• a plurality of parallel spaced wing panels extending from each of said two rows of columns and toward the other of said two rows of columns, wherein each of said wing panels integrally extends from around an inner half circumference of said main body rather than a full circumference.