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Thick and deep ribscan causesink marks
curing shrinkage(passive) caused bysink marks
The extended shrinkagecausessink marks
shrinkage of thick sections(passive) can be caused bysink marks
Too thick ribscausingsink marks
the radially - inward pull(passive) created bysink marks
a differential in volumetric shrinkage(passive) are caused bySink marks
material shrinkage during cooling(passive) caused bySink marks
localized shrinkage of the material(passive) are caused bySink marks
different shrinkage properties(passive) may appear caused bysink marks
localised shrinkage of the material(passive) are caused bySink marks
any heavy detail on the inner facesmight causesink marks
Maintain pressure for a few secondsto preventsink marks
an injection molding process ... more likelyto cause“ sink marks
mainly ... thermal contraction ( shrinkage ... during cooling(passive) are caused ... bySink marks
cooling shrinkage at excessive thickness locations(passive) caused bysink marks
localized shrinkage of the molded material at thick sections without sufficient compensation(passive) are caused bySink marks
The ribs are thinner than the shellto preventsink marks
The reduction in thick sectionspreventssink marks
locally thick regions(passive) caused bysink marks
ribs or bosses on the opposite side ( or � backside � ) of the part resulting from contraction or shrinkage of the plastic material during cooling(passive) are typically caused bySink marks
Difference in wall thickness due to ribs , bosses or other featurescausessink marks
Adjusting the placements and parameters of features like bosses and ribs can helppreventsink marks
Hot runners can also helppreventsink marks
at ribs or bases on the back side of a part(passive) are causedSink marks
A small cushion must be maintained ahead of the screw to compensate for part shrinkage as it cools under holding pressurethus preventingsink marks
A small cushion of material must be maintained ahead of the screw to compensate for part shrinkage as it cools under holding pressurethus preventingsink marks
nonuniform shrinkage during molding due to uneven temperature in the mold halves or to insufficient pressure 11 Thickness variations(passive) caused bySink marks —
hot plastic in thick sections of parts(passive) caused bysink marks
extra material in certain areas inside of the mold that requires additional cooling time(passive) are caused bySink marks
The thin , constantly sized walls and ribs in the partpreventunsightly sink marks
local thick / thin deviations in wall section(passive) caused bySink marks
as one thick lump resulted in a gaping hole in the middleto preventsink marks
Adjusting the placements and parameters of features like bosses and ribscan helppreventsink marks
The thickness of the ribs should be around a factor of 0,4 - 0,6x wall thickness of the part - stay on the lower endto preventsink marks
The bottom width of the tear seam : 0.4 ~ 1.0 mm Walls , ribs Ribs thickness should be 40 % of the surface thickness at maximumto preventsink marks
by forming IPT channel 19 in the inside of thick - walled section 11 at the roots of rib 12 and boss 17 and by using the IPT material of the present invention containing a foaming agent(passive) are preventedSink marks
low pressure in the molding cavities or too high of a injection molding temperature at the plastic gate(passive) can also be caused bySinks marks
low pressure in the molding cavities or too high of a molding temperature at the plastic gate(passive) can also be caused bySinks marks
low stress in the molding cavities or as well high of a molding temperature at the plastic gate(passive) can also be caused bySinks marks
from localized shrinkage of the materialresultfrom localized shrinkage of the material
from the injection molding process of plasticsresultingfrom the injection molding process of plastics
during the molding of the plug holder 80createdduring the molding of the plug holder 80
from formation of first tear groove 24a and second tear groove 24bresultingfrom formation of first tear groove 24a and second tear groove 24b
when a wall section is either too thick or there is a sudden change in section , typically where ribs and bosses are placed internally or where the extremity of the part is the same section or larger than the area where the feed is occurringare causedwhen a wall section is either too thick or there is a sudden change in section , typically where ribs and bosses are placed internally or where the extremity of the part is the same section or larger than the area where the feed is occurring
small elongated recesses 7 , similar to that in the first reinforcement rib 5 1preventingsmall elongated recesses 7 , similar to that in the first reinforcement rib 5 1
holes(passive) caused byholes
from a wall yielding to the still shrinking interior massresultfrom a wall yielding to the still shrinking interior mass
disruptions larger thanwere causingdisruptions larger than
from shrinkage in thick - walled sectionsresultingfrom shrinkage in thick - walled sections
from the volumetric shrinking of the resin materialresultingfrom the volumetric shrinking of the resin material
due to curing shrinkagecauseddue to curing shrinkage
because of uneven coolingwere causedbecause of uneven cooling
the above discussed problem(passive) caused bythe above discussed problem
in the shape of the external surface of the barrel 45 of the cylinder 40may create an unpredictablyin the shape of the external surface of the barrel 45 of the cylinder 40
generallyresultgenerally
for example by shrinkage during cooling , weld lines caused by the converging of melt flows and the likecausedfor example by shrinkage during cooling , weld lines caused by the converging of melt flows and the like
in ribbed postsare createdin ribbed posts
from the securing element being solidwould resultfrom the securing element being solid
on the inner wall of the center hole 2D of the turntable 42are createdon the inner wall of the center hole 2D of the turntable 42
to better production efficiencyleadsto better production efficiency
on the visual surface of the push button caps during their manufactureare createdon the visual surface of the push button caps during their manufacture