High Accuracy Plastic Mold Manufacturing with DUPONT material

High Accuracy Plastic Mold Manufacturing with DUPONT material

Tool for SUV car interior structure part injection molding.

Very strict for the size, and should pass necessary testing.

Issue solution example:

Flow Lines

Description: Flow lines are streaks, patterns, or lines – commonly off-toned in color – that show up on the prototype part as a consequence of the physical path and cooling profile of the molten plastic as it flows into the injection mold tooling cavity. Injection molded plastic begins its journey through the part tooling via an entry section called a “gate.” It then flows through the tool cavity and cools (eventually hardening into a solid).

Causes: Flow line defects are caused by the varying speed at which the molten plastic flows as it changes direction through the contours and bends inside the mold tool. They also occur when the plastic flows through sections with varying wall thickness, or when the injection speed is too low causing the plastic to solidify at different speeds.

Remedies:

1. Increase injection speeds and pressure to the optimal level, which will ensure the cavities are filled properly (while not allowing the molten plastic time to start cooling in the wrong spot). The temperature of the molten plastic or the mold itself can also be elevated to ensure the plastic does not cool down sufficiently to cause the defect.
2. Round corners and locations where the wall thickness changes to avoid sudden changes in direction and flow rate.
3. Locate the gate at a spot in the tool cavity with thin walls.

Sink Marks

Description: Sink marks are small craters or depressions that develop in thicker areas of the injection molded prototype when shrinkage occurs in the inner portions of the finished product. The effect is somewhat similar to sinkholes in topography, but caused by shrinkage rather than erosion.

Causes: Sink marks are often caused when the cooling time or the cooling mechanism is insufficient for the plastic to fully cool and cure while in the mold. They can also be caused by inadequate pressure in the cavity, or by an excessive temperature at the gate. All else being equal, thick sections of the injection molded part take longer to cool than thin ones and so are more likely to be where sink marks are located.

Remedies:

1. Mold temperatures should be lowered, holding pressure increased, and holding time prolonged to allow for more adequate cooling and curing.
2. Reducing the thickness of the thickest wall sections will also ensure faster cooling and help reduce the likelihood of sink marks.

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Our Main Services:

1. Plastic molds:

Hot runner mold, precision mold, over mold, two-shot mold, unscrewing mold, multi-cavity mold, IML/IMI mold, Stack mold, Die-casting mold, etc.

90% molds exported to North America, South American, Europe and Australia.

2. Injection Molding:

We have rich experience in molding various engineering grade resins:

ABS, PC, PC+GF, PC/ABS, PBT, PA6+GF, PA66+GF, PPS, PU, PP, PE, TPE, TPU, LCP, Ultem, etc.

3. One Stop Services

Based on our strong engineering capability,GOM provide a full turnkey solution for customers bespoke plastic

injection moulding needs inclusive of design, development, mould tooling, production and post moulding support.

• 3D Scanning

• Prototype

• Painting

• Pad-printing

• Silk-Screen Printing

• Hot Stamping

• Plating

• Color Match

• Ultrasonic Welding

• Automation

• Production Line Assembly

• Precision Metal Parts

• Die casting Parts