E-CATALOGUE


INTORDUCTION :
Over a period of times, demand for highly cost effective printing plate with improved plate quality in corrugated industries is increasing . Printing plate made from Liquid Photopolymer resin has provided excellent opportunity to cost conscious company. Awareness amount plate maker is also increased to use Eco friendly plate where there is no use of solvent which is highly hazardous to eco system. To meet this challenge, most of developed countries adopted Liquid Polymer plate over sheet polymer. Water based and Glycol based ink are used to print with liquid polymer plate.

KEY BENEFIT OF LIQUID POLYMER PLATE

  • Highly Economical printing plate
  • No hazardous solvent are used in process
  • Time taken to male Liquid plate is much less compare to conventional plate
  • Reduce inventory by using sample Liquid polymer for multiple gauge and size
  • Excellent print printability
  • Low tack plate
  • Excellent ink transfer

BENEFIT :

  • Wide exposure latitude and deep reverses
  • Good Dimensional stability
  • Easy mounting on plate
  • Plate run durability

INK :
Plate made from Liquids Photopolymer are compatible with water based and Glycol based ink

FLOW CHART OF MAKING PLATE FROM LIQUID POLYMER

flow chart

MAIN EXPOSURE PROCESS :

  • Clean the glass assembles with glass cleaner and wipe with lint proof cloth. t is essential that glass assemble should be very lean and without dust, lint etc.
  • Place the negative on glass with EMULSUION SIDE UP
  • Place the cover film on top of Negative and remove the air by applying vacuum
  • Place the Base film on Liquid Polymer and ensure that no air is trapped. The rough side of Base film should be in touch of Liquid polymer
  • Close the exposure unit
  • The top UV tube will in creating florae of plate
  • Bottom light will create image of plate

Reclaim :

  • Remove the plate after plate ie exposed. Remove cover film also
  • Remove Photopolymer which is not exposed .by UV light
  • Same reclaimed polymer is used for future plate.

WASH OUT
To obtain, highest quality of printing plate, it is very essential to maintain best water washing process. During polymerization there is possibility of unreacted polymer on plate. This will spoil quality of printing hence is is must to have proper washing of plate. The general formulation of water bath is:

  • 80 % Water
  • 9 % detergent of high concentration.
  • Small amount of Developer
  • Small quantity of Deformer

Procedure :
First fill the tank with water and add detergent and developer to water bath. Add require amount of Deformer. Set the wash out temperature correctly as recommended. Run one cycle to get proper mixing of all ingredients.

Temperature :
The temperature setting for the bath will vary dependent on the manufacturer of resin and machine

Changing Of The Bath : The life of water bath is depend upon thickness of plate, area of plate , amount of reclaimed resin used etc. The generally, one bath give about 15 to 20 run.

POST EXPOSURE CONDITIONS FOR TACK-FREE PLATES :
To obtain tack free photo polymer printing plate, require very precision post exposure condition. To get high quality of printing plate, all thre parameter such bas a Post exposure salt, post exposure time, intensity of lamp, frequency of water bath change etc should be properly maintain.
The post exposure step is very critical for producing tack-free photo- polymer printing plates. The quantity of post exposure salt, lamp intensity, post exposure time, and a clean post exposure bath, plus the frequency of bath changes all will impact the quality of the finished plate. Recommendations are provided below for the proper salt concentration and time of post exposure.

Mixing :
Take enough of water and add require amount of KIVI SALT in to water. Water should be enough to deep plate completely.

Lamps :
Normally, high quality of UV tube having intensity range between 15-20 mW/cm . After a running for reasonable time period the intensity will reduced to level off to around 15-18 mW/cm2. Bulbs should be replaced once the intensity falls to 8 mW/cm2. The life of tube depend upon usage generally, life of tube is about 18 Month

Exposure Times :
The correct Post-X exposure time is dependent upon lamp intensity. Generally post exposure time is 15 to 20 Minute. However, over a period of time, exposure time should increase

 

 
   
 
Designed by www.designinfotech.in © 2013. All Right Reserved. KIVI MARKINGS