What is a common cause of salivation during injection molding?
High fluidity in materials can cause them to flow too easily, leading to leakage.
Low pressure typically reduces the risk of drooling, not increases it.
Colder temperatures generally lead to less fluidity and reduced drooling.
Shorter holding times often decrease the chance of material dripping.
Excessive material fluidity is a primary cause of drooling in injection molding because it allows materials to flow uncontrollably, unlike low pressure or cold temperatures which usually mitigate such issues.
How does high nozzle temperature contribute to salivation in injection molding?
Higher temperatures make materials more fluid, increasing leakage risk.
Temperature affects fluidity more than viscosity directly.
Temperature control is more about flow than mold accuracy.
Temperature does not directly affect the pressure settings.
High nozzle temperature increases material fluidity, making it easier for the molten plastic to flow excessively and cause drooling, unlike the effects on viscosity or pressure.
Which equipment issue can lead to salivation during injection molding?
Check rings prevent backflow; damage can allow leaking.
A clean nozzle surface doesn't typically cause salivation.
Smaller apertures usually control the flow better, not worsen it.
Low fluidity is more likely to reduce, not cause, drooling.
A damaged check ring can lead to backflow of molten plastic after injection, resulting in drooling, unlike a clean nozzle or low fluidity materials which do not contribute to this issue.
Why might inappropriate material viscosity lead to salivation during injection molding?
Low viscosity materials flow more easily and can leak out.
Viscosity affects flow, not density directly.
Viscosity changes do not enhance sealing properties.
Viscosity does not have a direct cooling effect.
Inappropriate material viscosity, especially low viscosity, weakens the resistance to flow and makes it easier for the plastic to leak out, unlike density or cooling effects.
What role does excessive injection pressure play in causing salivation during injection molding?
High pressure forces more plastic through the nozzle.
High pressure typically does not reduce fluidity; it increases force.
Pressure does not directly affect cooling rates.
Pressure does not increase viscosity; it's about force and flow.
Excessive injection pressure can increase the pressure of the molten plastic at the nozzle, forcing more material through and causing drooling, unlike its effects on fluidity or cooling rates.
How can an unreasonable nozzle structure contribute to salivation during injection molding?
Shape and size impact how well flow is controlled.
Nozzle structure doesn't directly change temperature.
Surface finish quality isn't directly influenced by nozzle design in this context.
Nozzle structure impacts flow control, not cycle time directly.
An unreasonable nozzle structure affects the flow characteristics of the plastic, potentially causing drooling by failing to control the flow effectively, unlike its impact on temperature or cycle time.
Which maintenance practice helps prevent salivation in injection molding?
Inspection ensures nozzles are free from wear that could cause leaks.
Longer holding times might actually increase drooling risk.
Cycle speed reduction doesn't directly prevent drooling.
High pressures can increase drooling risks rather than reduce them.
Regularly inspecting nozzles is a maintenance practice that helps prevent salivation by ensuring they are not worn or damaged, unlike extending holding time or consistently high pressures which might exacerbate issues.
What effect does choosing materials with high fluidity have on injection molding?
High fluidity means materials flow more easily and can leak out.
Fluidity doesn't directly reduce blockage; it's about flow ease.
Material fluidity doesn't directly correlate with product strength.
Fluidity affects flow, not thermal properties like conductivity.
Choosing materials with high fluidity increases the risk of drooling because they flow more easily and can escape the nozzle, unlike their effects on blockage or product strength directly.