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注塑工藝各工序的溫度控制

1.料筒溫度：

熔料溫度是很重要的，所用的射料缸溫度只是指導(dǎo)性。熔膠溫度可在射嘴處量度或使用空氣噴射法來量度。射料缸的溫度設(shè)定取決于熔膠溫度、螺桿轉(zhuǎn)速、背壓、射料量和注塑件周期。您如果沒有加工某一特定級別塑料的經(jīng)驗，請從最低的設(shè)定開始。

為了便于控制，射料缸分了區(qū)，但不是所有都設(shè)定為相同溫度。如果運作時間長或在高溫下操作，請將第一區(qū)的溫度設(shè)定為較低的數(shù)值，這將防止塑料過早熔化和分流。注塑件開始前，確保液壓油、料斗封閉器、模具和射料缸都處于正確溫度下。

2.熔料溫度：

熔體溫度對熔體的流動性能起主要作用，由于塑膠沒有具體的熔點，所謂熔點是一個熔融狀態(tài)下的溫度段，塑膠分子鏈的結(jié)構(gòu)與組成不同，因而對其流動性的影響也不同，剛性分子鏈?zhǔn)軠囟扔绊戄^明顯，如PC、PPS等，而柔性分子鏈如：PA、PP、PE等流動性通過改變溫度并不明顯，所以應(yīng)根據(jù)不同的材料來調(diào)校合理的注塑件溫度。

3.模具溫度：

有些塑膠料由于結(jié)晶化溫度高，結(jié)晶速度慢，需要較高模溫，有些由于控制尺寸和變形，或者脫模的需要，要較高的溫度或較低溫度，如PC一般要求60度以上，而PPS為了達(dá)到較好的外觀和改善流動性，模溫有時需要160度以上，因而模具溫度對改善產(chǎn)品的外觀、變形、尺寸，膠模方面有不可抵估的作用。

4.注射壓力：

熔體克服前進(jìn)所需的阻力，直接影響產(chǎn)品的尺寸，重量和變形等，不同的塑膠產(chǎn)品所需注射壓力不同，對于像PA、PP等材料，增加壓力會使其流動性顯著改善，注射壓力大小決定產(chǎn)品的密度，即外觀光澤性。它沒有固定的數(shù)值，而模具填充越困難，注塑件壓力也增大。

部分型號部分物性表

LDPE (low density polyethylene # high-pressure polyethylene) /NA340185/ quantum chemistry
Use: other
Characteristic notes: the copolymer, the high branch, the acceptability of contact with the food, and the clear high
Important parameters: melt flow rate: 1 g/10min tensile strength: 21.4 MPa breaking elongation: 500% VEKA softening point: 95 C
Manufacturer: American quantum chemical company
LDPE (low density polyethylene # high-pressure polyethylene) /951-000/ Maoming petrochemical
Use: film grade
Characteristic notes: good processing performance, high transparency and strong versatility
Important parameters: melt flow rate: 2.17 g/10min density: 0.9185 g/cm3 tensile strength: 8 MPa breaking elongation: 350%
Manufacturer: Sinopec group Maoming Petrochemical Company
LDPE (low density polyethylene LDPE /LDJ226/ Australia Qenos #)
Use: film grade
Feature remark: antistatic additive.
Important parameters: melt flow rate: 2.5 g/10min density: 0.922 g/cm3 tensile strength: 16 MPa breaking elongation: 740%
Manufacturer: Qenos, Australia
LDPE (low density polyethylene LDPE #) /2420HK/ Leander Basel
Use: other
Characteristic notes: good processing performance
Important parameters: melt flow rate: 2 g/10min density: 0.924 g/cm3 tensile strength: 11 MPa hardness: 48 VEKA softening point: 94 C
Manufacturer: Liane Basel Industrial Corporation
LDPE (low density polyethylene # LDPE) /PE-017/ Repsol of Spain
Use: other
Characteristic notes: good processing performance, good stiffness
Important parameters: melt flow rate: 7 g/10min density: 0.919 g/cm3 fracture elongation: 9% flexural modulus: 150 MPa VEKA softening point: 88 centigrade
Manufacturer: YPF of Spain
LDPE (low density polyethylene # LDPE) /F101/ Singapore polyolefin
Use: film grade
Characteristic notes: strong and good
Important parameters: melt flow rate: 0.25 g/10min density: 0.921 g/cm3 tensile strength: 20 MPa breaking elongation: 700%
Manufacturer: Singapore polyolefin Private Companies
LDPE (low density polyethylene LDPE /DFD-6600/ Union Carbide #)
Use: film grade
Note: the characteristics of high strength, without modification, extrusion of thick, easy to control, no additives
Important parameters: melt flow rate: 0.25 g/10min density: 0.92 g/cm3
Manufacturer: Union Carbine Co
LDPE (low density polyethylene LDPE #) /LD-18AS/ Korea Dalin
Use: film grade
Characteristic notes: characteristics: transparency, surface gloss, machinability and excellent mechanical properties.
Important parameters: melt flow rate: 3 g/10min density: 0.921 g/cm3 notch impact strength: 90 tensile strength: 19 MPa breaking elongation: 580%
Manufacturer: Dalin, Korea
LDPE (low density polyethylene LDPE #) /1017/ America flintcomb ash
Use: film grade
Characteristic notes: good impact strength, good processability, heat resistance and foaming characteristics
Important parameters: melt flow rate: 2 g/10min density: 0.92 g/cm3 tensile strength: 11 MPa breaking elongation: 500% hardness: 50 VEKA softening point: 94 C
Manufacturer: American flint Hill resources
LDPE (low density polyethylene # high-pressure polyethylene) /ZH120/ Shanghai petrochemical
Use: other
Characteristic notes: polymer type: homopolymerization: injection molding
Important parameters: melt flow rate: 1.2 g/10min density: 0.92 g/cm3 tensile strength: 11 MPa VEKA softening point: 85 C
Manufacturer: Sinopec, Shanghai petrochemical Limited by Share Ltd
LDPE (low density polyethylene # high-pressure polyethylene) /2436H/ Maoming petrochemical
Purpose: film grade
Characteristic notes: good processing performance, good opening and very high transparency.
Important parameters: melt flow rate: 2 g/10min density: 0.924 g/cm3, notched impact strength: 110 tensile strength: 18 MPa, elongation at break: 600% VEKA softening point: 93 degrees.
Manufacturer: Sinopec group Maoming Petrochemical Company
LDPE (low density polyethylene # high-pressure polyethylene) /L2560S/ quantum chemistry
Purpose: film grade
Characteristic note: good thermal seal
Important parameters: melt flow rate: 0.6 g/10min density: 0.925 g/cm3 tensile strength: 21.4 MPa breaking elongation: 500%
Manufacturer: American quantum chemical company
LDPE (low density polyethylene # high-pressure polyethylene) /EC471/ West Lake
Use: other
Characteristic notes: good processing performance, excellent heat resistance seal, good moisture proof and so on
Important parameters: melt flow rate: 10 g/10min density: 0.918 g/cm3 tensile strength: 9 MPa breaking elongation: 450% VEKA softening point: 87 C
Manufacturer: West Lake Chemical Co., Ltd.
LDPE (low density polyethylene # high-pressure polyethylene) /EC472/ West Lake
Use: other
Characteristic notes: excellent adhesive substrate, good thermal seal, good moisture proof, etc.
Important parameters: melt flow rate: 5 g/10min density: 0.923 g/cm3 tensile strength: 11 MPa breaking elongation: 450% VEKA softening point: 100 C
Manufacturer: West Lake Chemical Co., Ltd.
LDPE (low density polyethylene # high-pressure polyethylene) /EF603/ West Lake
Purpose: film grade
Characteristic notes: good tensile properties, impact strength and thermal seal
Important parameters: melt flow rate: 1.2 g/10min density: 0.919 g/cm3 tensile strength: 19 MPa breaking elongation: 690%
Manufacturer: West Lake Chemical Co., Ltd.
LDPE (low density polyethylene # high-pressure polyethylene) /18BOA/ West Lake
Use: other
Characteristic notes: acceptable for food contact, high definition, high gloss, resistant to
Important parameters: melt flow rate: 20 g/10min density: 0.92 g/cm3, tensile strength: 11 MPa, elongation at break: 90% bending modulus: 228 MPa VEKA softening point: 90 C embrittlement temperature: -45 C.
Manufacturer: West Lake chemistry, USA