This time let’s talk about the PCB Dry film photoresist structure and main components.

1. PCB Dry film photoresist structure:

Dry film photoresist consist of the polyester film, photoresist film and polyethylene protective film three parts.

Polyester film is the based of Photosensitive layer, the thickness is usual 25um.
 
Polyethylene film is a protective film covered with a photosensitive layer on the top to prevent dirt dry dust and dirt.
General thickness of polyethylene film is also 25um.

Photoresist was the subject of dry filmmany,mostly is the negative light material.

2.The main components of photoresist film  :

1) binder (film-forming resin)

2) Light monomer

3) Photoinitiator

4) Plasticizer

5) tackifier

6) thermal polymerization inhibitor

7) pigment

(8)  Solvent
The solvent must be used to dissolve the above components, usually acetone and alcohol.

If you want to know more about produce procedure the rigid pcb,aluminum pcb, please contact with us anytime.