📌 Why Mold Changes Are Necessary

Mold changes are essential for:

• Cup Size Changeovers – Adjustments made to offer a range of cup sizes based on customer demand.
• Custom Designs – Created to meet specific branding needs or unique customer requests.
• Maintenance – To replace damaged molds and ensure consistent cup quality.

✅ Pre-Change Checklist

Before initiating a mold change, perform the following checks:

1. Mothermold Base Plate – Inspect for proper alignment and condition.

2. Paper Blank Holder – Ensure the stand is correctly aligned and secure positioning.

3. Component Removal – Detach:

• Curling plate
• Knurling bowl & tool
• Heater folding plate
• Cutter set
• Existing mold set (typically 8 pieces or 10 pieces)

Installing the New Paper Cup Machine Mold 🔧

1. Cutter Set – Correct installation and alignment are essential for precise functioning.

2. Mold Components – Start with a single mold piece for initial setup.

3. Knurling and Curling Components – Assemble sequentially following the installation of the initial mold.

4. Other Molds – Install the remaining 7 molds and adjust alignment carefully.

5. Robot & Cone Assembly – Ensure smooth functionality and correct alignment of the cone.

6. Glass Collector Check – Confirm alignment with new mold setup.

Validation Before Production 🧩

🔍 Paper & Blank Alignment

• First, confirm that the paper stand and blanks are compatible with the specifications of the new mold.

🧱 Mother mold & Butterfly Check

• Must be compatible with blank size and shape.
• The paper should wrap securely around the mold. Additionally, maintain at least 3 mm of sidewall sealing.

🧵 Cone Shaft & Robot Validation

• Next, check the taper, diameter, and length.
• Additionally, inspect the cone-paper fit on the robot arm to guarantee smooth operation.

⚙️ Component Alignment

• Match curling cup, knurling tool, and heater to blank thickness and design.

Mold Validation with Paper Blanks 📏

• Position the paper around the mold cone and check for accuracy.
  • The bottom extension is twice the depth of the knurling that is 10 mm for a 5 mm depth.
  • Sidewall seal = at least 3 mm
• Fit cone in mothermold:
  • No gaps
  • The cone base should be positioned 5 mm below the center of the T-rod.
• Use a long-leg vernier to check the knurling depth.
• Curling plate clearance = 2× paper thickness.

🛠️ Key Component Checks

Part	Checkpoints
Blank	Ensure the dimensions match the design specifications.
Mold Cone	Verify the sealing area, diameter, and compatibility with the knurling.
Mothermold	Check for any gaps and inspect the paraffin holes.
Butterfly	Ensure the wrap is firmly in place and properly aligned with the mold.
Knurling Tool / Bowl	Inspect for the correct height, taper, and depth.
Curling Plate	Ensure the clearance is double the paper thickness.
Fiber Plate	Verify that the diameter is 8–10 mm larger than the cup’s top.
Cutter Set	Check the blade sharpness, pitch circle diameter (PCD), and proper fit.