What is the primary purpose of drying ABS resin before injection molding?
Drying does not primarily affect gloss but another property related to defects.
Moisture in ABS resin can cause defects during molding, hence drying is crucial.
Drying is not directly related to color properties.
Tensile strength is inherent to the material, not affected by drying.
Drying ABS resin removes moisture, which can lead to defects like bubbles or weak spots during molding. This step ensures optimal flow and product quality.
Which mold material is recommended for high surface finish in ABS injection molding?
P20 steel is economical but not the best for high surface finish.
718 steel is preferred for its superior hardness and surface finish.
Aluminum is not typically used for high surface finish molds.
Cast iron is generally unsuitable for precision molding.
718 steel is recommended for molds requiring a high-quality surface finish due to its superior hardness and wear resistance.
What defect might occur if the mold temperature is too low during ABS injection molding?
Flow marks are surface defects caused by improper flow of molten plastic.
Shrink marks are related to cooling and holding times.
Warping is usually due to uneven cooling, not mold temperature alone.
Insufficient filling is more about pressure and speed than temperature.
Low mold temperatures can lead to flow marks, as the plastic may cool too quickly, resulting in uneven flow and visible patterns on the surface.
Why is ABS favored over polyethylene (PE) for injection molding applications?
ABS offers better mechanical properties compared to PE.
ABS has a higher density and cost than PE.
ABS has lower weather resistance compared to some other plastics.
Color options are not the primary reason for choosing ABS over PE.
ABS is preferred over PE due to its higher strength and heat resistance, making it suitable for more demanding applications.
Which cooling channel diameter range is typical for ABS injection molding?
This range is narrower than typical for effective cooling.
This range is standard for ensuring effective heat dissipation in molds.
This range is too large and inefficient for most molds.
This range exceeds typical cooling channel sizes for efficient molding.
The typical diameter range for cooling channels in ABS injection molds is 8-12 mm, allowing efficient heat dissipation without excessive space.
Which injection pressure range is generally used for ABS injection molding?
This range is lower than typically required for ABS molding.
This range provides enough force to mold ABS effectively.
Such high pressures are rarely needed for standard ABS products.
This pressure is insufficient for proper ABS molding.
Injection pressures of 70-150 MPa are typical for ABS molding, balancing force required to fill the mold while minimizing stress and defects.
What common defect can be prevented by ensuring uniform wall thickness in ABS products?
Uniform thickness helps prevent stress-induced warping during cooling.
Flow marks relate more to speed and temperature issues than thickness alone.
Fusion lines are a result of flow fronts meeting improperly, not wall thickness.
Filling issues are typically related to pressure and speed rather than thickness alone.
Warp deformation is minimized with uniform wall thickness, reducing stress points that could cause uneven shrinkage or bending during cooling.
What role does the ejector mechanism play in ABS injection molding?
Temperature control involves the cooling system, not ejection mechanisms.
Ejector mechanisms help release products from the mold without deformation.
Pressure settings are adjusted at the machine, not via ejectors.
Wall thickness is determined by mold design, not ejection systems.
The ejector mechanism facilitates smooth removal of molded products from the mold, preventing deformation or damage during demolding.