PCB ink FAQ (2)

Item

Question name

Phenomenon

Possible Causes

Countermeasures

3. The board color is not shining enough

1. Insufficient exposure energy

2. Insufficient residence time after exposure

3. Development temperature is too high

4. The developing concentration is too high

5. Negative film transmittance difference

6. Insufficient ink sensitivity

1. Confirm Exposure Operating Parameters Measure Mesa Exposure Energy

2. Increase the exposure time after exposure

3. Replace the film with better light transmittance

4. Confirm development job parameters

5. Modify ink properties

9

Drooping

1. Plug hole ink outflow

1. Poor print job conditions

2. Ink viscosity is too low

3. Ambient temperature is too high or humidity is too low

1. Reduce ink printing

2. Reduce diluent additions

3. Placed horizontally after printing

4. Adjust ink characteristics

5. Control environment temperature and humidity

2. Line ink flow

1. Ink viscosity is too low

2. Poor ink drying

3. Ambient temperature is too high or humidity is too low

1. Reduce ink printing

2. Reduce diluent additions

3. Placed horizontally after printing

4. Adjust ink characteristics

5. Control environment temperature and humidity

3. Plate surface (including substrate and large copper surface) ink flow

1. Ink viscosity is too low

2. Pre-bake oven operation is unstable

3. Poor ink drying

4. Ambient temperature is too high or humidity is too low

1. Reduce ink printing

2. Reduce diluent additions

3. Placed horizontally after printing

4. Pre-bake job board can not be too dense

5. Confirm pre-baking conditions and measure the temperature rise curve of each area

6. Adjust ink characteristics

7. Control environment temperature and humidity

10

Poor pre-drying

1. When the second surface is printed, the work board counters the printing surface

1. Poor ink drying

2. Prebaked Oven Operation Unstable Operating Parameters

3. Insufficient residence time after pre-baking

4. Excessive printing pressure

5. Printing table is not clean

1. Confirm printing parameters

2. Confirm pre-baking conditions and measure the temperature rise curve of each area

3. Increase the residence time after pre-baking

4. Clean the work surface and let it dry

5. Adjust ink characteristics

2. After the pre-bake, fingerprint test marks

1. Poor ink drying

2. Prebaked Oven Operation Unstable Operating Parameters

3. Insufficient residence time after pre-baking

1. Confirm pre-baking conditions and measure the temperature rise curve of each area

2. Increase the residence time after pre-baking

3. Adjust ink characteristics

3. Exposure sticky film

1. Poor ink drying

2. Unstable oven operation

3. Insufficient residence time after pre-baking

4. Vacuum suction pressure is too large

5. Excessive pressure

1. Confirm pre-baking conditions and measure the temperature rise curve of each area

2. Increase the residence time after pre-baking

3. Confirm exposure job parameters and job conditions

4. Adjust ink characteristics

Source: Guangzhou Huitian Fine Chemical Co., Ltd.