If your tools need be mold texturing or mold etching after Standard Polish in China. Please see the below information of standard polish before mold texturing:
A. The pattern depth < 40 micron requires 800# sandpaper at least.
B. The pattern depth 40 – 80 micron requires 600# sandpaper at least.
C. The pattern depth > 80 micron requires 400# sandpaper at least.
Acid Test Technical Requirements:
A. The acid test on your tools can be finished at your toolmaker in China before mold texturing & mold etching.
B. Yuan Su can act as your third-party supervision company for your tool projects to perform acid tests in China, helping to avoid welding issues and steel material differences by the toolmaker.
C. Yuan Su will issue detailed reports and feedback regarding the acid test results to ensure quality standards are met.
Before the acid test, please ensure the following operations are reviewed:
A. If the draft angle of mold texturing is insufficient, we will reduce the texture depth gradually to ensure successful demolding.
B. General Rule:
You require 1° of draft for each 13μ of texture finish depth.
Professional Advice:
Please check whether your tools require mold etching in advance when designing the Draft Angle. You should verify the texturing pattern or Grain No. depth alongside the Draft Angle. Reserving enough Draft Angle is essential to avoiding dragging marks during later injection molding processes.
To ensure your mold detail is handled professionally, please review:
Example: Improper welding causes visible marks after VDI 3400 etching.
Standard Welding Procedure:
A. Pre-heat: Thoroughly pre-heat the mold prior to any welding operation to minimize thermal stress.
B. Material Matching: Always weld the mold using a welding rod made of the same steel as the parent metal (base material).
C. Heat Treatment: Post-weld heat-treat the entire mold to ensure uniform temperature and consistent material hardness.
Warning: Improper welding technique or mismatched welding rods will result in “Welding Marks” or “Ghosting” after chemical etching or laser texturing. Ensuring the same steel chemistry is vital for texture consistency.
Glossiness is typically divided into the following three categories achieved by sandblasting the mold surface:
A. Gloss (High reflection)
B. Semi-gloss (Satin finish)
C. Matt (Low reflection / Dull)
Note: The final glossiness of plastic parts depends not only on the mold surface finish but also on the material properties and the adjustment of temperature and pressure during the injection trials.
To ensure optimal surface results, please review these essential mold details:
Important Maintenance Notice:
Please protect your mold surface from scratches, rust, and improper welding after the mold texturing process is finished.
Texture repair is a high-precision task that is closely related to
Welding,
Standard Polish,
Acid Test, and
Gloss Control.
“The quality of repair work is the ultimate test of our technicians’ technical ability and professional spirit.”