currentlocation:首页>Companynews>详细内容
NEWSNEWS
NEWSNEWS
HOTKEYWORDSHOTKEYWORDS
CONTACTUSCONTACTUS
linkpeople:Mr.Huang
phone:400-000-2811
fax:0571-89196509
email:hzsn@hzsn.com.cn
url:www.hzsn.com.cn
address:No.185KangtaiRoad,QianjiangEconomicDevelopmentZone,YuhangDistrict,Hangzhou,Zhejiang

Sainggivesyouananalysisofthecauseoftheyellowingofthelightguideplate

from:www.hzsn.com.cnbegintime:2018-04-28

Thediscolorationandyellowingoftransparentplasticparts,suchaslightguideplate,aremainlycausedbymaterialoverheatingoroversheardecomposition.Thefollowingcausesareanalyzedfromfouraspectsofmold,machine,moldingtechnologyandusematerial.
Analysisofthecausesoftheyellowingofthelightguideplate
1.[mold]
1)themoldexhaustisbad,themoldfillingissubjectedtoadiabaticcompressionunderhightemperatureandhighpressure,andtheplasticsareoxidized.
2)thesizeofrunnersystemandinletportofthegatingsystemistoosmall,sothattheplasticwillbecomediscolourationandyellowingunderexcessiveshearathightemperatureandhighpressure.
3)improperoillubricantsandmoldreleaseagentsinthemoldareattachedtothesurfaceoftheproducts,oxidizinganddiscoloringandyellowing.
Two.[machine]
1)duetothefailureordamageofthethermocouple,temperaturecontrolsystemandheatingsystem,thetemperatureofthebarrelisdisadjusted,whichleadstothepartialoverheatingofthebarrel,makingthematerial(includingadditives,colorants)discoloringandyellowinginthehightemperaturebarrelforalongtime.
2)thescrewisdamagedanddefective,theinnerwallofthebarrelisinjured,thenozzleisinbadagreementwiththeinletofthemainchannel,andthegapbetweenthescrewandthebarrelistoolarge,andthemeltmaterialisstuckinandaccumulated,andthediscolorationandyellowingarecausedbythelongtimefixedheating.
3)thenozzleandthecylinderarenotproperlymatched.Thematerialsinthegaparefixedandheatedforalongtimetocausediscolorationandyellowing.
4)theclearancebetweenthescrewandthebarrelistoosmall,orthescrewiseccentricity,whichcausesthematerialtodecomposeanddiscolorandbecomeyellowafterexcessiveshearing.
5)whenthenozzleholeistoosmallandthehighspeedcommercialpressureisfilled,itwillundergoexcessivesheardecomposition,discolorationandyellowing.
6)screwprocessingispoorinquality,roughinsurfaceorpoorindesign,resultinginexcessiveshearing,discolorationandyellowingofmaterialduringscrewthreadorstorage.
7)screwmaterialispoor,workingunderhightemperature,highpressureandhightorqueforalongtime.Screwdeformationcausesthematerialtoshearanddiscolorinapartofthebarrel.
Three.[moldingprocess]
1)whenthemeltspeedistoohigh,thebackpressureistoohigh,andtheshearisdiscoloredandyellow.
2)theformingtemperatureistoohigh,theformingperiodistoolong,theamountofresidualmaterialistoolargewhentheejectionisintheend,sothatthematerialstaysinthebarrelfortoolongandcausesthediscolorationandyellowingofthematerial.
Four.[moldingmaterial]
1)thepropertiesofmoldingmaterialsareunstable,toomanyregeneratedmaterials,ormixedwithmiscellaneousmaterials.
2)thematerialisnotwelldried,andthemoisturecontentinthematerialistoohigh.Thecoloredhydrolysisproductswillforminthehightemperaturecontainer,resultingindiscolorationandyellowingoftheparts.
TheaboveinformationisprovidedbyHangzhousaingplankCo.,Ltd.,"sningboard"contactphone:400-000-2811(Mr.Huang)isspecializedintheproductionandsalesofHangzhousunboard,Hangzhouenduranceboard,Hangzhoulightingboard,andwelcometoinquire.

  

Copyright www.hzsn.com.cn (copyLink)HangzhousaingplateCo.,Ltd.ProfessionalproductionSunshineplate,Enduranceboard,Lightingboardandotherproducts,welcometoorder.