What defect is characterized by wavy-like traces on the surface of plastic products due to excessive injection pressure?
This defect is related to overflow from the mold parting surface, not surface traces.
Excessive pressure can cause fast melt flow, leading to unstable melt fronts.
This defect involves scorching due to high localized temperatures, not surface traces.
This defect is about internal voids, not surface appearance.
Stream marks and silver streaks occur when excessive injection pressure causes the melt to flow too quickly, leading to unstable melt fronts. This creates wavy-like traces on the product surface. Flying edge and burn marks are caused by different issues related to mold parting and temperature, respectively.
What appearance defect is caused by excessive injection pressure, resulting in plastic melt overflowing from the mold parting surface?
This defect appears as fringes on the edges due to high pressure causing overflow.
This defect involves wavy lines due to rapid melt flow, not overflow.
These marks are due to high heat and friction, not pressure overflow.
These are internal defects, not related to appearance fringes.
Flying edge occurs when the injection pressure is too high, causing the melt to overflow from the mold's parting surface, forming fringes. Stream marks are wavy lines due to fast melt flow, and burn marks result from high frictional heat, not pressure overflow.
Which defect results from rapid melt flow involving air, creating a mottled surface appearance?
This defect looks like silver or mottled streaks on the product surface.
These are black or brown marks from excessive heat, not air involvement.
This involves plastic overflow at the edges, not air involvement.
This is an internal defect, not related to surface appearance.
Silver streaks form when rapid melt flow involves air, creating a mottled appearance on the surface. Burn marks are from excessive heat, flying edge is from overflow, and internal stress relates to internal structural issues.
What appearance defect is characterized by localized high temperatures causing discoloration and odor?
This defect is marked by discoloration and a burning odor due to high heat.
These appear as wavy lines due to unstable melt flow, not discoloration.
This involves overflow from the mold edges, not discoloration.
This refers to voids within the material, not surface discoloration.
Burn marks occur when excessive frictional heat causes discoloration and odor. Stream marks are wavy lines from unstable flow, flying edge is overflow from the mold, and internal cavities are voids inside the product.
What is a primary cause of flying edges in injection molded products?
Flying edges occur when the plastic melt overflows due to excessive pressure during molding.
Low mold temperature may cause other defects, but not specifically flying edges.
Slow cooling rates can affect product shrinkage, not directly related to flying edges.
Excessive clamping force might prevent mold opening issues but is not a direct cause of flying edges.
Flying edges are primarily caused by high injection pressure, which forces the melt to overflow from the mold's parting line, creating unwanted fringes. Low mold temperatures and slow cooling rates do not directly cause flying edges. Excessive mold clamping force also does not cause this defect.
How can silver streaks appear on the surface of an injection molded product?
Air entrapment at high speeds causes silver streaks, affecting appearance quality.
Excessive cooling affects dimensional stability, not the appearance of silver streaks.
Low pressure generally leads to incomplete filling, not silver streaks.
Inadequate clamping might cause flash but not silver streaks.
Silver streaks occur when the melt flows too quickly and involves air, leading to air entrapment. This causes the appearance of streaks on the product surface. Neither excessive cooling time nor low injection pressure causes silver streaks. Inadequate clamping force is unrelated to this defect.
Which defect is caused by excessive internal stress in injection molded products?
Excessive internal stress often leads to structural weaknesses, causing deformation and cracking.
Burn marks are typically due to high temperatures, not internal stress.
Weld lines occur when separate flows meet, unrelated to internal stress issues.
Color variations are often due to inconsistent material or process conditions, not internal stress.
Excessive internal stress can lead to deformation and cracking as the material cannot withstand external forces. Burn marks arise from high temperatures, weld lines from meeting flow fronts, and color variations from inconsistent material or processes, not from internal stress.
What causes flying edge defects in injection molding?
Low pressure typically results in incomplete filling of the mold.
Excessive pressure can cause plastic to overflow the mold, forming fringes.
Mold temperature affects cooling but not directly related to flying edges.
Cooling time affects solidification but not the creation of flying edges.
Flying edge defects occur when the injection pressure is too high, causing the plastic melt to overflow from the mold parting surface, resulting in unwanted fringes. This defect requires additional trimming, increasing production costs.
Which of the following is a result of excessive injection pressure during molding?
These defects arise from an unstable melt front and air entrapment.
Excessive pressure can actually weaken internal structures.
High pressure can lead to defects, slowing down overall production efficiency.
High pressure does not necessarily correlate with less material use.
Excessive injection pressure can lead to stream marks and silver streaks due to unstable melt flow and air entrapment. These appearance defects compromise the visual quality of high-gloss or transparent products.
Which factor is most likely to cause burn marks during the injection molding process?
High pressure can cause frictional heat build-up, leading to scorching of the plastic.
While low temperatures can cause other defects, they don't typically result in burn marks.
Slow speeds might result in incomplete filling, but not burn marks.
Cooling time affects the solidification but is less likely to cause burn marks.
Burn marks are primarily caused by excessive injection pressure, which generates frictional heat as the melt flows through narrow areas. This localized heat can scorch the plastic, resulting in burn marks. Other factors like slow injection speed or improper cooling time typically lead to different types of defects.
What can cause silver streaks or flow marks on the surface of an injection molded plastic product?
This pressure forces the melt to flow too fast, involving air and creating streaks.
A low mold temperature typically leads to poor surface finish but not streaks.
Slow speed usually results in incomplete filling rather than streaks.
This doesn't directly relate to the formation of silver streaks.
Silver streaks and flow marks occur due to excessive injection pressure. This high pressure causes the melt to flow too quickly, leading to an unstable melt front. As air gets involved, it creates streaks on the product's surface, affecting its appearance quality.