Causes of Blurred Images in CTP Plate Making
In modern printing production, CTP (Computer-to-Plate) has replaced traditional film-based plate making, but blurred images on plates can still occur. Blurred images directly affect print quality and are mainly caused during the plate-making process. The common causes can be classified as follows:
1. Blurring Caused by Contamination
Causes:
① Dust, oil, or debris on the CTP laser head, guide rail, or imaging window leading to unclear imaging.
② Foreign particles such as dust or hair on the PS plate surface that create blurry areas during exposure.
③ Poor cleanliness in the plate-making room, with airborne dust settling on the plate.
④ Defects on the plate itself, such as chemical spots or white spots.
2. Blurring Caused by Improper Imaging Parameters
Causes:
① Laser energy set too low or too high, resulting in insufficient imaging or overexposure.
② Misaligned laser focus or optical system shift causing dot edges to blur.
③ Incorrect device scanning speed or resolution settings, leading to distorted image edges.
④ Low RIP output resolution or data loss reducing image sharpness.
3. Blurring Caused by Development Issues
Causes:
① Developer temperature too high or too low, affecting image development quality.
② Development time too long or too short, causing dot thinning or loss.
③ Developer concentration too high or too low, reducing image contrast.
④ Developer replenishment insufficient or uneven, leading to inconsistent development.
4. Blurring Caused by Mechanical or Plate Issues
Causes:
① Unstable plate clamping or skewed plate feeding causing slight image distortion.
② Scratches, dents, or bends on the plate surface affecting uniform laser imaging.
③ Inconsistent plate batch quality causing uneven photosensitivity.
④ Wear or decreased precision in the plate-making machine’s transmission system causing ghosting or fuzzy edges.
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