Photo-imageable Etching and Plating Resist Ink

It is a new kind of photoimageable etching and plating resist ink. Its excellent coating

ability can be totally shown via various coating methods. Sharp definition, high accuracy and very minor under cut make it extremely suitable for producing one side, double-sided , high precision multi-layer and flexible PCB boards. Its acid-resistant ink which also good for the boards such as stainless steel , iron and aluminous material. The special characteristic is can be for Sn plating without post-cure.

Example of operation process:

1. Ink mixing

Mixing(Shaking) well for 5-10 min.

2. Pretreatment

Mechanical brushing or acid treatment.

3. Screen printing

a. Use nylon, polyester or stainless steel screen for printing

b. 100-250 mesh/inch.

c. Rubber/Polyurethane (PU) Squeege with the hardness of -65-75 .

d. Printing Angle 70-80

e. Film thickness: 8-16 um

4. Precure

First side 75±5 x 10 min

Second side 75±5 x 15 min

Both side cure at the same time 75±5 x 15 min

5. Exposure

Energy required from UV rays:100-200mj/cm2

Photographic sensitivity :300-500nm

(Photosensitivity: 6-9 step)

6. Developing

By 1-1.2% sodium carbonate (Na2CO3) solution

Spraying pressure:2-3 kg/cm2

Temperature: 30-32

Time: 45-60 sec.

7. Stripping

The coating could be stripped completely with 3-5% NaOH solution at 45-50;

Spraying pressure 2-3kg, 1-2 min