PVC sheet manufacturing process comprises
of following important sections:
1. Raw material bulk
handling & mixing unit
2. Process Roller.
3.
Calenders
4. Cooling unit
5. Haull-offunit
6. Cutting
unit
7. Inspection unit
Raw material Bulk Handling &
Mixing Unit :- The raw materials are automatically weighed and
added to a blender as per specific ratio. The blend is then
fed to a fluxing machine which melts the ingredients (both
solid & liquid raw material).
Now, compounding of
material is done in continuous mixers. This mixture comes as
outlet on two nips. These two nips form two layers of rough
sheet. These two layers of sheets are j oined at a press
machine, where these sheets are widened. The sheets are then
fed into two process roller to move the sheet forward.
It
is then processed through calender roller which converts the
rough sheet into homogeneous flat (equal thickness) sheet.
This thickness can be adjusted by moving upper and bottom
calender.
To make the sheet flat and bring it down to the
appropriate thickness, calenders have three or more rollers,
each over two feet in diameter and six feet in length. The
thickness of sheet is usually between 2 to 50 thousandth of an
inch thick. Now, the sheet is passes through cooling unit.
After cooling, the sheet is fed to Haull off unit where dust
& other particles are removed off the sheet. The sheet is
moved to cutting unitremoved off the sheet. The sheet is moved
to cutting unit where sheet gets cut in desired
length.
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