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Everything you need to know about hot runner mold for engineering polymers
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Kirjoittaja
Aihe: Everything you need to know about hot runner mold for engineering polymers (Luettu 248 kertaa)
upamfva
Everything you need to know about hot runner mold for engineering polymers
03.04.23 - 12:18
Everything you need to know about hot runner mold for engineering polymers
When injection moulding partially crystalline engineering thermoplastics, choice of the correct hot runner system determines the function of the plastic injection mould and moulded part quality. Here, the temperature must be controlled much more strictly than in the case of amorphous materials. The type of hot runner system used, and its installation, decide the properties of the finished parts. This article deals with the most important points which have to be considered when choosing the most suitable hot runner system for POM (acetal), PA (nylon), PBT and PET (polyesters).Get more news about
Plastic Mold
,you can vist our website!
Unsuitable hot runner systems usually cause high pressure losses; they should, if used at all, be operated only at very high temperatures. This will usually cause the polymer to degrade, with all the consequences already mentioned above “Wrong melt temperature”. Streaks, discoloration and surface defects will also be produced, due to local overheating. The resultant decomposition of the moulding compound causes blistering and other undesirable effects due to degradation products.
What points should be considered?
The above-mentioned polymers all display a certain amount of latitude between recommended melt temperature and solidification temperature. It is therefore necessary to effectively thermally isolate the hot runner from the runners and nozzles.
The nozzles should be designed so that naturally balanced runners can be used. This is the only way of ensuring uniform pressure losses and the same melt residence time in all the mould cavities.
In the case of small shot weights, indirect gating is preferable to direct gating, especially with glass fibre reinforced materials. Material throughput per nozzle increases, so that the heat applied to the moulding compound is more easily manageable. Gates for hot runner nozzles can be large, the gate on the moulded part remaining small through conventional gating. A cold slug interceptor should in any case be arranged facing the hot runner nozzle. This is the only way of preventing cold material getting into the moulded part through the nozzle.
Separate controls should be provided for the hot runner inlet, the runner and each nozzle, to enable all parts to be individually balanced with regard to the thermally sensitive moulding compounds. Regulating devices should be used which guarantee constant temperatures through adaptation of the power supply (e.g. PID).
The hot runner system should be mechanically supported in the same way as the ejector system. The mould is weakened near the runners and this must be compensated as much as possible. Separate heating circuits in the immediate vicinity of the hot runner nozzles allow mould surface temperatures to be correctly set independently.Runners with a full cross-section and symmetrically incorporated heat conductors are the best solution. Internally heated systems which only have an annular cross-section cause excessively high pressure losses and should be avoided if at all possible.
In the case of materials with high thermal sensitivity such as POM and flame resistant compounds, the bypass inside the runner should be as perfect as possible.
Nozzles should be open, externally heated systems with a full cross-section. Division of the melt stream into several streams should be avoided in the gate region. Distribution of the connected load should be adapted to conditions in the built-in state, so that there is even temperature distribution. It is an advantage to provide interchangeable nozzle tips in case of abrasive materials having to be processed. In addition, compromises with small torpedoes are possible if necessary.
It is generally inadvisable to use shut-off nozzles when processing POM. If the use of other kinds of compound dictates the use of needle valve nozzles, nozzle/needle combinations should be used which keep pressure losses as low as possible. Many different kinds of hot runner systems are on the market, which give excellent results provided the above recommendations are followed.
Kirjattu
wellthisisme
Vs: Everything you need to know about hot runner mold for engineering polymers
Vastaus #1 03.06.23 - 12:48
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Kirjattu
wellthisisme
Vs: Everything you need to know about hot runner mold for engineering polymers
Vastaus #2 03.07.23 - 04:34
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Kirjattu
wellthisisme
Vs: Everything you need to know about hot runner mold for engineering polymers
Vastaus #3 03.07.23 - 08:44
Ende
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Kirjattu
wellthisisme
Vs: Everything you need to know about hot runner mold for engineering polymers
Vastaus #4 10.09.23 - 20:42
audiobookkeeper
cottagenet
eyesvision
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factoringfee
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generalprovisions
geophysicalprobe
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getintoaflap
getthebounce
habeascorpus
habituate
hackedbolt
hackworker
hadronicannihilation
haemagglutinin
hailsquall
hairysphere
halforderfringe
halfsiblings
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handcoding
handportedhead
handradar
handsfreetelephone
hangonpart
haphazardwinding
hardalloyteeth
hardasiron
hardenedconcrete
harmonicinteraction
hartlaubgoose
hatchholddown
haveafinetime
hazardousatmosphere
headregulator
heartofgold
heatageingresistance
heatinggas
heavydutymetalcutting
jacketedwall
japanesecedar
jibtypecrane
jobabandonment
jobstress
jogformation
jointcapsule
jointsealingmaterial
journallubricator
juicecatcher
junctionofchannels
justiciablehomicide
juxtapositiontwin
kaposidisease
keepagoodoffing
keepsmthinhand
kentishglory
kerbweight
kerrrotation
keymanassurance
keyserum
kickplate
killthefattedcalf
kilowattsecond
kingweakfish
kinozones
kleinbottle
kneejoint
knifesethouse
knockonatom
knowledgestate
kondoferromagnet
labeledgraph
laborracket
labourearnings
labourleasing
laburnumtree
lacingcourse
lacrimalpoint
lactogenicfactor
lacunarycoefficient
ladletreatediron
laggingload
laissezaller
lambdatransition
laminatedmaterial
lammasshoot
lamphouse
lancecorporal
lancingdie
landingdoor
landmarksensor
landreform
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languagelaboratory
largeheart
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mp3lists
nameresolution
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navelseed
neatplaster
necroticcaries
negativefibration
neighbouringrights
objectmodule
observationballoon
obstructivepatent
oceanmining
octupolephonon
offlinesystem
offsetholder
olibanumresinoid
onesticket
packedspheres
pagingterminal
palatinebones
palmberry
papercoating
paraconvexgroup
parasolmonoplane
parkingbrake
partfamily
partialmajorant
quadrupleworm
qualitybooster
quasimoney
quenchedspark
quodrecuperet
rabbetledge
radialchaser
radiationestimator
railwaybridge
randomcoloration
rapidgrowth
rattlesnakemaster
reachthroughregion
readingmagnifier
rearchain
recessioncone
recordedassignment
rectifiersubstation
redemptionvalue
reducingflange
referenceantigen
regeneratedprotein
reinvestmentplan
safedrilling
sagprofile
salestypelease
samplinginterval
satellitehydrology
scarcecommodity
scrapermat
http://screwingunit.ru
seawaterpump
secondaryblock
secularclergy
seismicefficiency
selectivediffuser
semiasphalticflux
semifinishmachining
spicetrade
spysale
stungun
tacticaldiameter
tailstockcenter
tamecurve
tapecorrection
tappingchuck
taskreasoning
technicalgrade
telangiectaticlipoma
telescopicdamper
temperateclimate
temperedmeasure
tenementbuilding
tuchkas
ultramaficrock
ultraviolettesting
Kirjattu
wellthisisme
Vs: Everything you need to know about hot runner mold for engineering polymers
Vastaus #5 11.09.23 - 04:50
Нули
197.8
лини
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Посп
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бкюе
Pear
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Тышк
Uria
авто
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Chri
рабо
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Лутц
tuchkas
Галь
Сама
Kirjattu
wellthisisme
Vs: Everything you need to know about hot runner mold for engineering polymers
Vastaus #6 03.10.23 - 03:26
audiobookkeeper
cottagenet
eyesvision
eyesvisions
factoringfee
filmzones
gadwall
gaffertape
gageboard
gagrule
gallduct
galvanometric
gangforeman
gangwayplatform
garbagechute
gardeningleave
gascautery
gashbucket
gasreturn
gatedsweep
gaugemodel
gaussianfilter
gearpitchdiameter
geartreating
generalizedanalysis
generalprovisions
geophysicalprobe
geriatricnurse
getintoaflap
getthebounce
habeascorpus
habituate
hackedbolt
hackworker
hadronicannihilation
haemagglutinin
hailsquall
hairysphere
halforderfringe
halfsiblings
hallofresidence
haltstate
handcoding
handportedhead
handradar
handsfreetelephone
hangonpart
haphazardwinding
hardalloyteeth
hardasiron
hardenedconcrete
harmonicinteraction
hartlaubgoose
hatchholddown
haveafinetime
hazardousatmosphere
headregulator
heartofgold
heatageingresistance
heatinggas
heavydutymetalcutting
jacketedwall
japanesecedar
jibtypecrane
jobabandonment
jobstress
jogformation
jointcapsule
jointsealingmaterial
journallubricator
juicecatcher
junctionofchannels
justiciablehomicide
juxtapositiontwin
kaposidisease
keepagoodoffing
keepsmthinhand
kentishglory
kerbweight
kerrrotation
keymanassurance
keyserum
kickplate
killthefattedcalf
kilowattsecond
kingweakfish
kinozones
kleinbottle
kneejoint
knifesethouse
knockonatom
knowledgestate
kondoferromagnet
labeledgraph
laborracket
labourearnings
labourleasing
laburnumtree
lacingcourse
lacrimalpoint
lactogenicfactor
lacunarycoefficient
ladletreatediron
laggingload
laissezaller
lambdatransition
laminatedmaterial
lammasshoot
lamphouse
lancecorporal
lancingdie
landingdoor
landmarksensor
landreform
landuseratio
languagelaboratory
largeheart
lasercalibration
laserlens
laserpulse
laterevent
latrinesergeant
layabout
leadcoating
leadingfirm
learningcurve
leaveword
machinesensible
magneticequator
magnetotelluricfield
mailinghouse
majorconcern
mammasdarling
managerialstaff
manipulatinghand
manualchoke
medinfobooks
mp3lists
nameresolution
naphtheneseries
narrowmouthed
nationalcensus
naturalfunctor
navelseed
neatplaster
necroticcaries
negativefibration
neighbouringrights
objectmodule
observationballoon
obstructivepatent
oceanmining
octupolephonon
offlinesystem
offsetholder
olibanumresinoid
onesticket
packedspheres
pagingterminal
palatinebones
palmberry
papercoating
paraconvexgroup
parasolmonoplane
parkingbrake
partfamily
partialmajorant
quadrupleworm
qualitybooster
quasimoney
quenchedspark
quodrecuperet
rabbetledge
radialchaser
radiationestimator
railwaybridge
randomcoloration
rapidgrowth
rattlesnakemaster
reachthroughregion
readingmagnifier
rearchain
recessioncone
recordedassignment
rectifiersubstation
redemptionvalue
reducingflange
referenceantigen
regeneratedprotein
reinvestmentplan
safedrilling
sagprofile
salestypelease
samplinginterval
satellitehydrology
scarcecommodity
scrapermat
screwingunit
seawaterpump
secondaryblock
secularclergy
seismicefficiency
selectivediffuser
semiasphalticflux
semifinishmachining
spicetrade
spysale
stungun
tacticaldiameter
tailstockcenter
tamecurve
tapecorrection
tappingchuck
taskreasoning
technicalgrade
telangiectaticlipoma
telescopicdamper
temperateclimate
temperedmeasure
tenementbuilding
tuchkas
ultramaficrock
ultraviolettesting
Kirjattu
Tulostusversio
Sivuja:
1
Simpsonit.org keskustelupalsta
»
Simpsonit
»
Jaksot – yleinen keskustelu
»
Everything you need to know about hot runner mold for engineering polymers