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CONVENTIONAL/OFFSET Negative PS plate PRINGTING PLATE

Model No.︰PS PLATE
Brand Name︰PHOENEAGLE
Country of Origin︰China
Unit Price︰-
Minimum Order︰1000 SQM
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Product Description

Negative Pre-sensitized Offset Printing Plate

Introduction

Phoeneagle negative PS plates have high pressrun, proper exposure rate, simple plate making, and perfect dot reproduction advantages and so on.  In order to make the plate reach its best printing efficiency, please use it under the following conditions.

 

  1.  Printing down(Exposure):

Negative ps plate’ exposure is finished by negative film jointing nearly with sensitive plate, spectrum range is between blue ray and ultraviolet ray (320-450nm), while exposing, the iodine gallium lamp is the most proper lamp-house and around 150mJ/cm2 exposure quantum is recommended, in the actual operation, the exposure time can be different according to different exposure equipment and different film sort. So the exposure time must be decided by actual experiment result.

When platemaking by machine, please guarantee the energy is big enough, or else, the pressrun will be affected.

  1. Put FUJI gray scale (0.15 tier) on the edge of plate and under the film, choose the proper exposure quantum to expose the plate, after finishing exposing, wash the plate, the optimum exposure quantum can be determined on the ninth step without printing ink.

 

 

 

 

 

  1. Use UGRA PCW82 control strip, choose proper exposure quantum to expose it, when the 15-20um weenie line appear on the control strip, the exposure quantum reach its optimum state.

 

                                                                              

 

 

                                                                 

 

15~20μ

                        

 

 

 

 

 

 

 

 

 

                           Weenie line sketch map  

(3) Remark:

In order to reach the most pressrun, the exposure quantum must be enough;

In order to prevent halftone (net dot) being scale-up, the exposure quantum can’t be added or decreased optionally. Avoid the tone value, transferred from film with halftone to printing plate, increasing excessively and decreasing excessively so that the thin part of the dark area disappearing; the tone value must be controlled in the permitted range.

(4) Before using our plate to print, please operate it under the yellow safe light to prevent exposing before printing for fear it influences quality.

2.    Develop

Kodak -956 developer and our company’s negativedeveloper are strongly recommended.

Develop temperature: 25±2

Developer’s dilution ratio: 1:2 for Kodak -956 developer (developer: water);

Developer’s dilution ratio: 1: 1.5 for our company’s negativedeveloper (developer: water).

Develop time: 30-60 seconds.

Manual develop: must scrub, wash off remnant developer on the surface of plate.

Automatic develop: develop machine must be equipped with brush to reinforce developing efficiency.

Introduction:

  1. Because the developer from different area is of diversity, some of negative plate will appear shallow yellow on the surface after developing, with the plate substrate being using, the shallow yellow will disappear automatically, it won’t influence printing effect (Kodak -956 developer has no such problem).
  2. In order to solve the problem, you can expose the developed plate once again, that will not only eliminate the shallow yellow but also enhance pressrun.

3.    Correction:

In order to wipe off the excrescent image and stain, you can lay right quantity negative remover on the surface of image or stain. 15 seconds later, wash the surface.

  1.   Inking up (Dip ink):

The function of dipping ink to negative plate is to enhance the image area’s capability of absorbing ink and enduring fretting. The negative plate must be laid a layer of sensitive colophony additionally on the image area.

  1.    Lay on plate gum.

        The gum must be diluted under the manufacturer’s requirements, and the layer should be well-distributed. Too thin or too thick all will influence the effect, and if you lay on gum automatically, please control the drying temperature.

        If you lay on plate gum by manual, after platemaking, after developer, please lay on the plate gum within 10-15min.

 6.   Storage

(1) Before using: The negative plates should be stored in the cool (10—30), dark and dry place. Relative humidity 60%.

(2) Storage life: 8-10 months.

specifications︰UV CTCP NEGATIVE PLATE (UV CTnP) TDS

PLATE GAUGES
Standard: 0.15/0.3/0.4mm

COATING-EXPOSURE
Coating colour : Light green
The color is light blue after exposure
Colour change after exposure: high
Contrast after developer: high
Day light sensitivity-UV: it is recommended to work under safety yellow light of low UV radiation.
Spectral sensitivity: 400-450nm. With peak sensitivity at 410nm.
Usable on platesetters with inter mal drum or flat bed.
Screen reproduction: 1%-99% at 200 l.p.i.
Resolution: up to 3200dpi and stochastic(FM)screen 20 microns.

DEVELOPMET
Use developer Kodak 956 or Phoenix. Negative developer.
Kodak 956: Water =1:1.5, Water =1:2, Water =1:2.5, Three kinds of ratio can be.
Phoenix Negative developer.: Water =1:1
Developer temperature: 23°C±1°C.; Fahrenheit:73.4±1.8
Development time: 30±5 seconds i immersion.
Replenishment: use developer Kodak 956 or PHOENIX-900 as a replenisher.
Replenishment rate: 60ml/㎡
Antioxidant stand by ON 30ml/h.
Antioxidant stand by OFF 30ml/h
When using machine imaging, imaging of the brush should be removed to prevent damage to the image area.
PHOENIX developer is designed for has expired Negative PS Plate preparation of the developing solution
Using PHOENIX developer, can already expired Negative PS Plate resume printing function.

DELETION
Use EAST TOP deletion pens with wide, medium and fine point.
Apply over the area to be corrected and leave for 20-30 seconds.remove by washing with abundant quantities fo water.
Recommended conductivity range: 800-1.500 microsiemens.
Note the results obtained may vary depending if the conditions of use are outside of our recommended values.
Type: Negative CTnP plate Note
Spectral sensitivity: 405nm
Exposure energy: 90-110mj/cm2
Developing time: 30-40 seconds
Developing Conditions: Pure Developer: Water =1:1,
Fahrenheit:73.4±1.8
Centigrade:23±1 Take off the brush when develop in the machine.
Resolution: 1-99%at200l.p.i.
Run-length: 200,000-300,000 (Varies with its printing conditions and imaging content )
CTCP Machine MATTCHED BasysPrint;Luscher;Cron;PolyTech
Energy ≥90mw Make adjustment according to the speed of machine
Drum Speed ≥700rpm Make adjustment according to the energy of machine

Safelight: Yellow light




NOTE:
There might be light yellow on the plate after developing. Some suggestions are recommended as follows:
1. Please continue to use it without worrying.
2. Disappearing quickly: Put it the UV-light to make it disappear quickly.
3. Obtained by developing the right image after the UV light in any secondary exposure, printing capabilities can be extended by 50%.
Advantages︰Advantage of Negative ps plate:
1) Save energy;
2) Faster platemake;
3) Extend equipment life;
4) Making plate by machine or by manual all are ok;
5) High pressrun,could be 800,000pcs.
Export Markets︰Worldwide
Ship Date︰15-20DAYS.
Standard Met︰ISO & CE
Product Image


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