PP, 2-step ejection screw cap, pin gate hot runner, cycle time short to 16 seconds with regular hydraulic injeciton machine.
Item and Finish Target | ||
1 | Resin & Color | PP-H, Solid Red |
2 | Finish Requirement | Full and uniform filling, dimensions meet specifications, good surface without scratches |
3 | Finish Weight | 16grams/piece |
Mold Scenario | ||
4 | Structure | 6-cavity, pin gate gate hot runner, sleeve and stripper plate ejection |
5 | Steel & Process | S50C standard mold base, 2738 core and cavity, quenching & nitriding treatment |
Molding | ||
6 | Machine Clamping force | 200KN |
Cycle Time | 16 seconds |
Why One-Time Ejection is Not Always Sufficient
One-time ejection might not be sufficient in certain circumstances due to the following reasons:
- Complex Geometries:
- Parts with intricate designs, undercuts, or fine details might get damaged or deformed if ejected too forcefully in a single step.
- Material Properties:
- Certain materials, such as those with higher adhesion properties or those prone to warping, might stick to the mold surfaces. A single ejection could cause these parts to warp or tear.
- Tight Tolerances:
- For parts with tight dimensional tolerances, a more controlled ejection process helps to maintain the integrity and precision of the dimensions.
- Risk of Sticking:
- Parts that tend to stick to the mold require a gradual release to avoid pulling or tearing. Two-step ejection helps in gently dislodging the part without causing surface defects.
- Ejector Pin Marks:
- A single, forceful ejection can leave marks or indentations from the ejector pins on the part. A two-step process helps to minimize these marks by distributing the force more evenly.
- Large or Heavy Parts:
- Larger or heavier parts benefit from a gradual ejection process to prevent bending or breaking under their own weight during removal.
Example Scenarios
- Thin-Walled Parts:
- Thin-walled plastic parts are prone to deformation if ejected too quickly. A two-step ejection helps to gradually release these parts, maintaining their shape and structural integrity.
- Parts with Undercuts:
- Parts with internal or external undercuts require careful ejection to avoid damage. The initial ejection step helps to release these features gently.
- Aesthetic Surfaces:
- For parts where surface finish is critical, a two-step ejection minimizes the risk of surface defects such as drag marks or scratches.
In summary, the two-step ejection process is particularly useful for handling complex, delicate, or precision parts where a single ejection could lead to defects or damage. By gradually releasing the part from the mold, the process helps ensure higher quality and consistency in the final product.
VolksMolds is a leading plastic injection mold manufacturer known for its expertise, experience, and proven history. The company excels in producing high-precision molds for various sectors, including packaging, store displays, and homewares. With a commitment to quality and innovation, VolksMolds consistently delivers reliable and efficient molds, earning a strong reputation in the global market.