Mold injection molding is a processing method used for mass production of certain parts with complex shapes.The specific principle refers to: the plastic raw material melted by the heat of the injection molding machine screw to promote high-pressure injection into the cavity of the plastic mold, after cooling and curing, to get the plastic molded products.

Common defects and causes of injection molded parts:

1.  Fringed

2. There are missing pieces

3. white

4. There's the trailing flower.

5. deformable

6. magnitude

7. Fusion bonding is evident

Causes：

1. Excessive fit clearance

2. Poor glue movement, trapped air

3. Thimble too small, uneven ejection

4. Too little beveling, burrs, lack of hardness

5. Uneven injection pressure, insufficient product form strength

6. processing error

7. Far from gate, low mold temperature

Adjustment method:

1.    Reasonable adjustment of clearance and grinding of working part parting surfaces

2. Localized gluing, plus venting

3. Larger thimbles for even distribution

4. Trimming, Beveling, Nitriding

5. Trimming sprues for even pressure and product strength

6. rework

7. Improve gate, increase mold temperature

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