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This post dives into the world of quality control (QC) for fittings, sharing solutions for problems you might encounter during production. We'll reference a training slide (not included here, but hopefully the details resonate) to guide you through various issues and effective solutions.

                     Top Page of Training Slide

Color:

• Problem: Inconsistent or incorrect color.
• Solutions:
  • Ensure raw materials meet color specifications.
  • Calibrate and maintain coloring equipment regularly.
  • Implement in-process checks for color consistency.

Easy Push (%):

• Problem: Fitting inserts with too little resistance during assembly.
• Solutions:
  • Verify mold dimensions and tolerances.
  • Adjust injection pressure or material viscosity.
  • Implement statistical process control (SPC) to monitor push force.

Over Flash:

• Problem: Excess plastic material around the fitting body.
• Solutions:
  • Fine-tune mold clamping pressure.
  • Optimize injection parameters like holding pressure and time.
  • Ensure proper mold venting to allow air escape.

Tap/Bend:

• Problem: Deformations or misalignments in the fitting shape.
• Solutions:
  • Inspect molds for wear and tear, ensuring proper alignment.
  • Adjust injection parameters to manage shrinkage and stress.
  • Improve mold cooling design for uniform cooling.

Flow Mark:

• Problem: Visible lines or swirls on the fitting surface caused by uneven plastic flow.