Precision Plastic Mold designed and solve weld lines with short shot testing

Precision Plastic Mold designed by UG NX11.0 and AutoCad

1 cavity mold for auto part with PP66-50%GF Black material.

Issue Solution example

Weld Lines

Description: Weld lines are actually more like a plane than a line that appears in a part where molten plastics meet each other as they flow from two different parts of the mold.

Causes: Weld lines are caused by the inadequate bonding of two or more flow fronts when there is partial solidification of the molten plastic.

Remedies:

1. Raise the temperature of the mold or molten plastic.
2. Increase the injection speed.
3. Adjust the design for the flow pattern to be a single source flow.
4. Switch to a less viscous plastic or one with a lower melting temperature

Short Shot

Description: As the term implies, short shots can be described as a situation where a molding shot falls short. This means that the molten plastic for some reason does not fully occupy the mold cavity or cavities, resulting in a portion where there is no plastic. The finished product becomes deficient because it is incomplete.

Causes: Short shots can be caused by a number of things. Incorrect calibration of the shot or plasticizing capacities can result in the plastic material being inadequate to fill the cavities. If the plastic is too viscous, it may solidify before fully occupying all the cavities and result in a short shot. Inadequate degassing or gas venting techniques can also result in short shots because air is trapped and has no way to escape; plastic material cannot occupy the space that air or gas is already occupying.

Remedies:

1. Select a less viscous plastic with higher flowability. This plastic will fill the hardest-to-reach cavities.
2. Increase mold or melt temperature so as to increase flowability.
3. Account for gas generation by designing the mold so that gas is not trapped within the mold and is properly vented.
4. Increase the material feed in the molding machine or switch to a machine that has a higher material feed in the event that the maximum material feed has been reached.

FAQ:

1.Why choose GOM?

High Quality and short lead time with best engineering service to bulid long-term business relationship with customer.

2.What GOM service?

-Components manufacturing

-Plastic molds building

-Injection producing

-Painting & Plating

-Assemble

-Engineering support

3.How to control the quality?

Every process finish must make the measurement by CMM and should be passed then can do the next process.

4.How to provide after-serivice on the overseas?

We have 3 Parters in different area can deal it, in Mexico,Czech and Spain.

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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