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The manufacturing process of plastic platform trolleys—whether injection molding or rotational molding—significantly affects their structural strength, durability, and lifespan. Each method has distinct advantages and limitations that impact the performance of the final product.
1. Injection Molding: High Precision & Strength
Process:
Injection molding involves melting plastic resin and injecting it into a mold under high pressure, where it cools and solidifies into the final shape.
Impact on Structural Strength & Lifespan:
High Strength & Rigidity: The controlled molding process allows for uniform material distribution, leading to a dense and structurally strong platform.
Smooth & Consistent Surface: Produces a precise, polished finish, reducing stress points and potential weak areas.
Reinforcement Capabilities: Glass fiber or other reinforcements can be added to enhance load-bearing capacity.
Lightweight & Cost-Effective: Typically results in lighter yet strong trolleys, suitable for general industrial use.
Potential Weaknesses: May develop stress points at sharp corners or joint areas, which can crack under extreme load or impact over time.
Best Applications:
High-volume production where uniformity and precision are crucial.
Medium-duty to heavy-duty trolleys used in warehouses, retail, and logistics.
2. Rotational Molding: Enhanced Durability & Impact Resistance
Process:
Rotational molding involves heating plastic resin inside a rotating mold, allowing the material to coat the interior and form a hollow structure.
Impact on Structural Strength & Lifespan:
Seamless, One-Piece Construction: No joints or welds reduce weak points, making the trolley highly resistant to cracking and breakage.
Thicker, Even Wall Distribution: Provides excellent impact resistance, making it ideal for heavy-duty applications.
Higher Durability & Longevity: The process results in a more flexible and shock-absorbing structure, reducing long-term wear.
Slightly Heavier & More Expensive: Rotationally molded trolleys tend to be heavier due to thicker walls and higher material usage.
Less Precision & Longer Production Time: Produces slightly rougher textures and has longer cycle times than injection molding.
Final Comparison: Which Process is Better?
| Factor | Injection Molding | Rotational Molding |
|---|---|---|
| Structural Strength | High rigidity, potential stress points | High impact resistance, flexible structure |
| Durability | Strong but may develop cracks under extreme stress | Highly durable, resistant to impact and wear |
| Load Capacity | Moderate to high, depending on reinforcements | High, due to thicker walls and seamless design |
| Surface Finish | Smooth, consistent, and polished | Slightly rougher with potential texture variations |
| Weight | Lightweight | Heavier due to thicker construction |
| Production Speed | Fast, suitable for mass production | Slower, better for specialized designs |
| Cost | Lower material usage, cost-effective for large runs | Higher cost due to longer production and more material usage |
| Best for | Medium to heavy-duty applications | Heavy-duty, high-impact environments |
