Printing Roller Plastisol comes in 3 standard grades:

 P5309 ORANGE  PLASTISOL – BASE COAT  This plastisol is about an A50 to A60 durometer plastisol that is used to bond to the metal core (Aluminium or Mild Steel roll). It can also be used as a finish roll plastisol. See below.

 The P5309 plastisol is normally bonded to the metal core roll by the dipping process:

First the metal core is coated with Primer coat – see A1104 Primer Data Sheet.

(NOTE PRIMER IS DIPPED AT ROOM TEMPERATURE AND DRIED FOR 60 MINUTES

 AT ROOM TEMPERATURE – 25 deg C). (Do not cure freshly primed metal in an oven

because of fire Hazards).

The primed metal core is then preheated to 180 deg C and dipped into the P5309 Base plastisol.

The hot metal is left in the Plastisol until a thick coating of plastisol has built up onto the metal core.

The metal core is removed slowly and set in the oven to cure at 180 deg C for a short period.

The metal core - coated with a thick layer of P5309 plastisol -  is placed into the jig ready for casting

one of the next 3 plastisols around it:

 

P1003 CLEAR SOFT PLASTISOL – OUTSIDE ROLLER  This is most commonly used as

a Print Transfer Roller. It has a durometer of approximately A-10 to A15 or ( S90 to S100).

 It is poured into the above jig with the coated metal core positioned centrally.

It fills around the coated metal core to the desired thickness (between 1 and 4 inches thick).

Then the whole jig including the metal core and plastisol is placed in an oven and baked at

180 degrees C for the required amount of time to reach full cure.

 

P2309  ORANGE MEDIUM PLASTISOL – OUTSIDE ROLLER 

In place of the P1003 plastisol where a harder roll durometer is required, the above

process is carried out using P2309 Medium Orange plastisol which has a durometer

of approximately A20 to A30 range.

So the above procedure is carried out but,  P2309 is used to give a harder Outside Roller.

 

P5309  ORANGE HARD PLASTISOL – OUTSIDE ROLLER  In place of the P1003 plastisol

where an even harder roll durometer is required, the above process is carried out using

P5309 Medium Orange plastisol which has a durometer of approximately A50 to A60 range.

So the above procedure is carried out, but  P5309 is used to give a harder Outside Roller.

 

Glazing and Finishing the Print Roller;  The softer print rolls can be glazed with a

Propane torch  to give a nice even glossy finish or burned down to even out the roll diameter.

The harder P5309 outside rollers can be lightly sanded with a fine grit Sandpaper (200 or 300 grit).

 

As the print roller wears down unevenly,  the roller can be evened out with a Propane Torch

(for softer rollers P1003 or P2309) or a fine grit sandpaper ( for the harder rollers P5309 plastisol).

Hence the life of the Print Roller can be greatly extended by several refinishings,

before having to be recoated.

 

for questions e-mail roy@qcminds.com

or call 1-800-321-0170

253-859-0933 outside of USA.