Product
Professional supplier of electronic screen printing solutions
NPR-3800 Insulation Ink
- Commodity name： NPR-3800 Insulation Ink
- 柔性线路-COF： 1.Ink with excellent insulating properties</br> 2.2-liquid Ink with mixing of main agent and hardener</br> 3.Heat curing Ink
Introduction
Ink with excellent insulating properties
2-liquid Ink with mixing of main agent and hardener
Heat curing Ink
Shelf life
| Main polymers | Main polymer Useful life (days) | Hardener | Main polymer Useful life (days) |
| NPR-3800 | 180 | HARDENER NPR-3800 | 180 |
Standard process
Mixing process
●About mixing conditions
Type: Planetary centrifugal mixer ARE-310 (made by THINKY) Mixing conditions
Vessel capacity: 150ml, ink weight: 20-100g
●First step
Mixing mode
RPM/Rotation = 2000 / 800 rpm (2 min.); RPM Revolution＞Rotation
●Second step
Defoaming mode
Number of revolutions / speed = 2000 / 54.5 rpm (2 minutes)
Revolution > Rotation and the ratio of rotation needs to be reduced compared to the mixing mode.
When mixing with a planetary centrifugal mixer, heat is generated by the shear heat, and the higher the mixing, the higher the Ink temperature.
A temperature of 35-45°C is ideal for mixing.
After mixing, it is necessary to let the Ink stand until it returns to room temperature (4 hours or more).
During this period, the air bubbles inside Ink will float up to reduce the air bubbles.
Sufficient defoaming time is required after screen printing and heat curing must be done only after defoaming is complete.
Also, if the printing environment temperature is too high, this will cause the solvent to evaporate faster, resulting in air bubbles remaining on the coating film.
Precautions for Screen Printing
●Screen Mesh
Mesh number: The smaller the number, the thicker the film will be.
General conditions: 3D SUS plate (Asada mesh system) 200 to 250 mesh/inch
3D SUS plate has a special mesh formation method, and even though it has the same number of counts, it has a thicker film than the usual SUS plate.
●Screen printing conditions
Squeegee hardness: If the hardness is softer, the film thickness will be thicker easily.
General condition: 80°.
Squeegee angle: The smaller the angle, the thicker the film will be.
General conditions: 70°.
Coating speed: The slower the speed, the lower the amount of foam involved.
General conditions: 50-80mm/sec.
Essentials of Screen Printing (Screen Mesh)
●3D screen
Straightening the vertical lines and going to a substantial weave with the horizontal lines ensures about 1.5 times the thickness of the printed film. The lines in contact with the printing surface have fewer crossings, which improves flatness after printing.
●Advantages of 3D screens
①Approximately 1.5 times the thickness of the printed film compared to a screen with the same wire diameter.
②Increased flatness after printing.。
③Reduces the occurrence of pinholes.
Essentials of Screen Printing (Squeegee)
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