Mitsubishi PEN-4 Specifiche Scaricare il pdf (Pagina 36)

- 24 -

The pH value of the plate cleaner for SDP-Alpha plates should be between 3.0 to 4.0 and

should not include tiny particles for cleaning.

Determine whether the existing plate cleaner can be used for SDP Alpha plates or not by the

following procedure:

(1)Create the 30%tint pattern on the plate.

(2)Put two cottons soaked with plate cleaner on this tint pattern.

(3)Wipe the plate with both cottons and leave them about one hour. After removing cottons, print

the plate.If no dot loss occurs at where the chemical is applied,that plate cleaner can be used for

the plates

7-3. SDP-αOA

(1) Performance

The SDP-αOA is a fountain solution additive agent that has a function to prevent the oxidation stains

or emulsion stains from occurring on the metal plate.

The SDP-αOA is used in the following cases.

(1) To prevent oxidation stain from occurring

Adding 2 % or less of this agent can help to prevent an oxidation stain from occurring on the

plate.

(2) To improve hydrophilic feature

This agent can foster the hydrophilic feature of the fountain solution, as well as prevent an

emulsion stain from occurring.

(3) To help ink to come off from the plate

The ink can be come off from the plate surface more easily by increasing the hydrophilic feature

of the fountain solution. This prevents tint problems from occurring.

(4) To stabilize the fountain solution during a long-run printing

As this agent can help to maintain the viscosity and surface tension of the base fountain

solution, a stabilized quality of fountain solution can be supplied even during a long-run

printing.

(5) Concurrent use with conventional plate

This agent can be also used for the conventional plate.

(2) Precautions for handling the additive agent

(1) If the additive agent is added in more than the specified amount (2.5 %), an over emulsion

problem may occur, and as a result, it may deteriorate the ink rollup feature. Therefore, do not

add this agent in more than the specified rate.

(2) This solution may not help to prevent an oxidation stain, depending on the type of the ink or the

fountain solution used, after the printing press has stopped its operation several times.

(3) If an oxidation stain reoccurs on the plate, wipe off the stain with the special cleaner (SDP-α

CL) or the recommended plate cleaner.

(4) Do not freeze the additive agent (it may turn the agent whitish).

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 50 51

Nessun commento

Mitsubishi PEN-4 Specifiche Pagina 36