Industry and solutions(Plating industry,Auto industry,Appliance industry)
Ø industries we served : 3C digital appliance , Home appliance ,
Automobile , Plating industry , Etc.
Ø Solution : Eliminate injection parts shrinkage , Welding line ,
Reduce cracks ,Floating fiber ,Flow mark , Stress mark and could
eliminate hot runner mark and make injection part perfect.
Injection welding lines
Ø General injection moulding issues: Shrinkage , Sliver streak ,
Burn marks , Rough selvedge , Vent mark,Crack , Stress mark ,
Floating fiber , Warpage , Welding lines Etc.
Ø Crack , Stress mark , Floating Fiber , Warpage , Welding mark
Etc. These issues can not be settled byinjection parameters
adjustment or mold structure improvement , These issues could be
settled by change moulding temperature only.
Ø Welding lines forming:For injection moulding , to meet injection
moulding condition, Multi-direction runners are needed .During
injection process, melt resin flows inside cavities, when melt
resin meets the cold mold core. melt resin temperature drops
gradually , at the final confluence, the melt resin does not fully
coalesce due to temperature inconsistencies(below the TG point)
Rapid heating and cooling injection
Ø Working principle : 4 processing stages 1.Mold heating 2. Mold
high temperature maintaining 3. Cooling and pressure maintaining 4.
Miscellaneous media removal.
Ø High temperature and high pressure steam are blown into mold
cavity , mold cavity temperature rises rapidly ,when temperature of
mold cavity reach glass transition temperature(TG)instantly .
injecting melt resin (As mold cavity is in high temperature , the
flowability of resin is good in mold cavity and easy to integrate)
into mould cavity , Then keep the pressure and cool down the mold
(during the cooling down processing , vapor temperature control
system simultaneously doing the miscellaneous media removal work
for next production cycle) , after
cooling down work done and resin is moulded . Mold will be open and
the part could be taken out , thus one high glossy part with
perfect surface production completed
(Small mold ) 10---20 Sec. 20--35 Sec.
(Big mold) 20—30Sec 20----40Sec.
Advantage of rapid heating and cooling mold
Ø 1:Rapid heating an cooling molds need use heat-resisting and good
conductivity steel to meet fierce temperature change.
Ø 2:Mold water ways should avoid using water proof ring , it is
better water connectors directly connect to mold cores to reduce
heat dispersion and guarantee safety during injection.
Ø 3:Inner surface of mold need very high finishing to ensure mirror
effect surface of plastic part.
Ø 4:Waterways design inside mold should be reasonable and even
distribution . and water ways quantity need ensure mold core's
rapid heating and cooling.(Proper distance between waterways and
mold core is very critical also)
Ø 5:Special attention to the maintenance of molds should be paid
after injection production , molds should be kept dry and dust free
Rapid heating and cooling mold achieve mirror effect
Waterways should be designed along with the shape and even
distribution.Part production total cycle time is 40 Sec.
Rapid heating and cooling injection technology features and
Ø 1.Eliminate welding line , Shrinkage mark and flow mark.
Ø 2.Enhance the gloss on the surface of parts , so as to achieve
mirror , high-black and high gloss effect ,completely solve the
plastic part shrinkage issue.
Ø 3.Improve the tensile , compressive strength and surface
Ø 4. Reduce subsequent processing procedures(such as painting and
electroplating) increase yield by 20-30%
Ø Eliminate floating fiber surface of glass fiber parts. Thin wall
forming can improve of molding fluidity .Improve product quality
and strength ,and reduce the injection cycle of thick wall moulding
by more than 40%.
Ø 6. For electroplate parts, it can improve part mirror effect,
eliminate the welding lines , reduce the crack mark of parts to be
plated and the defective rate of plating production.
Ø 7.Eliminate parts stress mark, release internal stress of parts ,
improve rib marks of texture parts .
Ø 8. Reduce injection pressure and prolong injection machine's
Ø 9.Eliminate hot runner mark and make injection part more perfect.
more information will be update next time!