Tinius Olsen MP1200 Extrusion Plastometer Page 16-1
Operation Manual # 02002215
16 Cleaning Instructions
16.1 It is absolutely imperative that the cylinder, die and piston are cleaned thoroughly
after EACH test.
16.2 After the test has been completed, allow the weight to remain on the piston until all the
excess material in the barrel has extruded through the orifice.
CAUTION: The piston rod assembly and the orifice become hot during use.
16.3 Remove the weight and the piston. If a WLD is being used, raise the weight platform all the
way up until the weight platform swings out of position. Wipe the piston thoroughly using a
cloth made from a natural fiber (cotton). The cloth must be clean and free from oil or grease
of any type as they may affect future test results. Place the piston on the tool rack or on an
insulated surface that will prevent it from rolling.
16.4 Remove the orifice from the bottom of the cylinder. Clean the outside of the orifice with the
clean, natural fiber cloth. Clean the bore of the orifice with the orifice drill. If necessary, the
orifice bore can be brushed, using a 0.090” diameter brass brush available from Tinius
Olsen. There should be no residue on the orifice after cleaning.
16.5 Clean the cylinder by placing a cotton patch over the cylinder, then pushing the patch
through the cylinder using the Cylinder Cleaning Tool in a manner similar to cleaning a gun
barrel. Change the patch and repeat at least 3 times or until there is no visual evidence of
material remaining on the cylinder wall. If necessary, the cylinder can be brushed, using a
0.406” diameter brass brush tip and barrel brush handle available from Tinius Olsen. 2-1/2”
square Cotton patches are available from Tinius Olsen.
16.6 Drop the orifice in the cylinder. It should fall to the bottom easily and there should be an
audible click when it hits the bottom of the cylinder. If not, remove the orifice and re-clean it
and the cylinder.
16.7 Always replace the piston and orifice back into the furnace as soon as possible so that they
are up to temperature for the next test.
Note: If no more tests are needed, ALWAYS remove the piston and orifice from the furnace
before turning the MP1200 off to prevent them from being welded in place as any material
left in the barrel hardens.
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