According to the cause of the bubble, the solution to the problem has the following aspects:
(1) When the wall thickness of the product is large, the cooling rate of the outer surface of the product is faster than that of the center portion. Therefore, as the cooling progresses, the resin edge of the center portion shrinks to expand toward the surface, causing insufficient filling of the center portion. This condition is called vacuum bubble. The main solutions are:
a) According to the wall thickness, determine the reasonable gate, runner size. The general gate height should be 50%~60% of the wall thickness of the product.
b) There is a certain amount of supplementary injection material until the gate is sealed.
C) The injection time should be slightly longer than the gate sealing time.
d) reduce the injection speed and increase the injection pressure,
e) Use a material with a high melt viscosity rating.
(2) As a result of the generation of volatile gas bubbles, the main solutions are:
a) Fully pre-dry.
b) Lower the temperature of the resin to avoid generating decomposition gases.
(3) Bubbles caused by poor fluidity can be solved by increasing the temperature of the resin and mold and increasing the injection speed.
According to the cause of the bubble, the solution to the problem has the following aspects:
(1) When the wall thickness of the product is large, the cooling rate of the outer surface of the product is faster than that of the center portion. Therefore, as the cooling progresses, the resin edge of the center portion shrinks to expand toward the surface, causing insufficient filling of the center portion. This condition is called vacuum bubble. The main solutions are:
a) According to the wall thickness, determine the reasonable gate, runner size. The general gate height should be 50%~60% of the wall thickness of the product.
b) There is a certain amount of supplementary injection material until the gate is sealed.
C) The injection time should be slightly longer than the gate sealing time.
d) reduce the injection speed and increase the injection pressure,
e) Use a material with a high melt viscosity rating.
(2) As a result of the generation of volatile gas bubbles, the main solutions are:
a) Fully pre-dry.
b) Lower the temperature of the resin to avoid generating decomposition gases.
(3) Bubbles caused by poor fluidity can be solved by increasing the temperature of the resin and mold and increasing the injection speed.
According to the cause of the bubble, the solution to the problem has the following aspects:
(1) When the wall thickness of the product is large, the cooling rate of the outer surface of the product is faster than that of the center portion. Therefore, as the cooling progresses, the resin edge of the center portion shrinks to expand toward the surface, causing insufficient filling of the center portion. This condition is called vacuum bubble. The main solutions are:
a) According to the wall thickness, determine the reasonable gate, runner size. The general gate height should be 50%~60% of the wall thickness of the product.
b) There is a certain amount of supplementary injection material until the gate is sealed.
C) The injection time should be slightly longer than the gate sealing time.
d) reduce the injection speed and increase the injection pressure,
e) Use a material with a high melt viscosity rating.
(2) As a result of the generation of volatile gas bubbles, the main solutions are:
a) Fully pre-dry.
b) Lower the temperature of the resin to avoid generating decomposition gases.
(3) Bubbles caused by poor fluidity can be solved by increasing the temperature of the resin and mold and increasing the injection speed.
