Shanghai Daoqin Plastics Co., Ltd.

chemical and material features PE-HD high crystallization degree it high density, resistant force strong/high degree, high temperature temperature degree, viscous property and chemical stability property. PE-HD ratio PE-LD has more strong/high resistant property. PE-HD impact resistant strong/high degree relatively low. PH-HD features main/primary density and molecular weight distribution control. suitable for injection molding parts 模 PE-HD molecular weight distribution very narrow. for/regarding density is 0.91~ 0.925g/cm3, 我们称之 is type type PE-HD; for/regarding density is 0.926~ 0.94g/cm3, is type type PE-HD; for/regarding density is 0.94~ 0.965g/cm3, is type type PE-HD. material flow features very good, MFR is 0.1 to 28 between. molecular weight high, PH-LD flow features 越差, is has more good impact resistant strong/high degree. PE-LD is semi crystallization material, molding rear shrinkage rate relatively high, in 1.5% to 4% between. PE-HD very easy ring force cracking phenomenon. can through use very low flow features material decrease small internal force, from decrease light cracking phenomenon. PE-HD当 temperature degree high 于60C时 very easy in type solvent agent in solvent understanding, its resistant solvent understanding property ratio PE-LD also need good 一. injection molding parts process conditions drying: if 存储恰当则无 must drying. temperature degree: 220~260C. for/regarding separation relatively large material, 建议熔化 temperature degree scope/range in 200~250C between. injection molding parts mold temperature degree: 50~95C. 6mm below/following thick parts use relatively high injection molding parts mold temperature degree, 6mm above thick parts use relatively low injection molding parts mold temperature degree. parts cooling temperature degree uniform decrease small shrinkage rate 差异. for/regarding most excellent processing cycle time, cooling 腔道直径应不 small 于8mm, and injection molding parts mold surface 距离应 in 1.3d之 inner （ this 里“d” is cooling 腔道 直径）. injection pressure: 700~1050bar. injection speed degree: use high speed injection. runner and gate: runner in 4 to 7.5mm between, runner long degree can can short. can use various type type gate, gate long degree need ultra- 0.75mm. especially suitable for use hot runner injection molding parts mold.