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Positive PS plate

Model:PE-1
Brand:-
Origin:Made In China
Category:Packaging , Printing & Paper / Printing Materials
Label:POSITIVE , Plate
Price: US $1.9 / SQM
Min. Order:1000 SQM
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Company Information

Detail

Product Description

POSITIVE PLATE INTRODUCTION

Our company’s PS plates have good plate life, high color contrast, and perfect dot reproduction abilities. In order to make the plate reached the best printing state, please use it under the following requirements.

  1.        Exposure level

Aided by the Fuji Fifteen-steps step guide (recommended) or other compatible step guide, then under the correct developer concentration, temperature and the developing time, you should control the exposure level between the first two steps white and the third step shallow appearance. For example:

    OUR STANDARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Positive Type (the first two steps clear)   FUJI fifteen-steps step guide

  1.      Exposing time

The exposing time under 3000W lodine gallium lamp at 1 meter is about 75S. If the power of the lamp and the distance to the plate are different, please expose the plate abiding the data in the following table.

Before Exposing, please notice the efficiency of the vacuum-pumping, the film must be engaged with the PS plate without any cracks, or it will produce some halation, then the halation will influence the dot reproducing and decrease the plate life. So please keep the vacuum degree below 20Kpa.

The lamp distance to the plate must be longer than the diagonal line, and the lamp aligns to the plate positively. Or it will produce the halation and the exposure stage of plate will be non-homogeneous.

When the lodine gallium have been used for a long period, because of the ageing processing, you should notice to elongate the exposing time. When the exposing time is 20% longer than the normal exposing time, so as not to influence the working efficiency, you should consider to replace the lodine gallium lamp.

  1.        Developing

       Developer: Fuji DP-4 developer or our company’s ARFA-Ⅱ developer

     Temperature: 25±1℃      Time of Developing: 30+/-10s

The developer’s dilution ratio:

             Automatic plate processor:  1:6

             Manual plate processor: 1:10

 Notes: Our PS plates required weak alkalinity developing; the developer’s concentration, temperature and the developing time should be paid much attention, or it will decrease the run length and the printing efficiency. On the developer or developing powder which are produced by other companies, please use it under the condition they required to achieve our standard.

  1.        Correction

      Please use the image remover to wipe off the unwanted stains. And be sure not to damage the image. When the remover remains on plate for 45S, wipe off it with a piece of soft cloth, then wash it clear by water. Or it will be easily to be dusted.

  1.          Gumming

   The gum must be diluted under the manufacturer’s requirements, and the layer should be well-distributed. If the layer is too thin, it will be easy to be dusted and be scratched; if the layer is too thick, the plate is not easy to get the ink, and the text is easy to lose. And if you gum the plate automatically, please control the dry temperature at 60℃.

  1.          Baking

Baking temperature(Recommended): 230—250℃

   Baking time: 6—8 minutes

   After baking, please cool the plate naturally, don’t cool it by wind or water, or it would be distorted.

  1.          Storage

Before exposing: The plates should be stored in the cool (10—30℃), dark and dry place.

After exposing:  To avoid the light, and storing under the safety yellow light.

  1.          The reason of problems may happen and solutions

Problems

Examine process

Reasons

Solutions

Surface breezing

Exposing handling

Plates have been wrinkled.

improve the way of handling the plate

Exposure

Light source is too closed to the plate.

Adjust the distance between lamp and the plate longer than plate diagonal.

There are dusts on the film and the glass on the exposing machine.

Clean them with specialized cleanser.

Exposure

Non-homogeneous

Exposure

Light source is too closed to the plate.

Adjust the distance between lamp and the plate longer than plate diagonal.

Light source do not positive align to the plate.

Adjust the light source positive toe the plate.

Text Fragment

Exposure

Dust on the glass of the exposing machine.

Clean them with specialized cleanser.

Low run length

Exposure

Exposure degree haven’t achieved (Negative plate)

Check the real exposure degree by step guide, increase the exposing time.

developing

overdeveloped

Check the dilution rate, temperature of the developer, and the developing time

Adjust the reel roll pressure

The pressure between plate and rubber sheet is too high.

Decrease the pressure , and check it scheduled

The pressure between ink-roll and the plate is too high.

Decrease the pressure, and check it scheduled

Rubber sheet

The elastane of the rubber sheet is weak

Replace the rubber sheet

Handling

Overexposed(Positive plate)

Check the real exposure degree by step guide, decrease the exposing time.

Fountain solution

The concentration of the solution is changed 

Using the supply point.

Plate splitted

Lock-up

Plate is been distorted and splitted when locking up

Be careful to lock up

Handling

Plate has been wrinkled

Be careful to handle

Ink shortage

gumming

Gum is too thick or not well distribute.

Diluted the gum, and find a good way too make the layer well distributed.

Baking

Baking gum is too dense

Well-distribute the baking gum on the surface

Adjust the printing pressure

The pressure of the plate cylinder—blanket cylinder and impression cylinder –blanket are low.  

Increase the pressure, and check it scheduled.

The pressure of the plate cylinder—ink roll is low.

Increase the contacted pressure, and check it scheduled.

 


Payment Terms:T/T L/C

Product Image

Positive PS plate  1
Img 1
Positive PS plate  2
Img 2
Positive PS plate  3
Img 3

Send Inquiry to this Company

Anhui Phoenix plate Technologuy co., Ltd

hongyingtao Industrial Zone Sanshitou Town Hefei Anhui China

Phone:
0086-0551-66331111
Fax:
0086-0551-66337886
Contact:
Seader Zhang (sales manager)
Mobile:
66331111

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