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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(lái)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(méi)有加工某一特定級(jí)別塑料的經(jīng)驗(yàn)，請(qǐng)從最低的設(shè)定開(kāi)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(yùn)作時(shí)間長(zhǎng)或在高溫下操作，請(qǐng)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(guò)早熔化和分流。注塑件開(kāi)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(duì)熔體的流動(dòng)性能起主要作用，由于塑膠沒(méi)有具體的熔點(diǎn)，所謂熔點(diǎn)是一個(gè)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(duì)其流動(dòng)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(dòng)性通過(guò)改變溫度并不明顯，所以應(yīng)根據(jù)不同的材料來(lái)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(dòng)性，模溫有時(shí)需要160度以上，因而模具溫度對(duì)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(duì)于像PA、PP等材料，增加壓力會(huì)使其流動(dòng)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(méi)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(hào)部分物性表

LDPE (low density polyethylene # high-pressure polyethylene) /E6838-902F/ West Lake
Use: other
Characteristic notes: acceptable, slippage of food contact
Important parameters: melt flow rate: 1.3 g/10min density: 0.92 g/cm3 tensile strength: 30 MPa breaking elongation: 200% VEKA softening point: 92 C
Manufacturer: West Lake Chemical Co., Ltd.
LDPE (low density polyethylene # high-pressure polyethylene) /H2-26T/ Turkey Petkim
Purpose: film grade
Important parameters: melt flow rate: 1.5 g/10min density: 0.923 g/cm3
Manufacturer: Turkey Petrochemical holding company
LDPE (low density polyethylene # high-pressure polyethylene) /F2-26TO/ Turkey Petkim
Use: film grade
Important parameters: melt flow rate: 2.1 g/10min density: 0.924 g/cm3
Manufacturer: Turkey Petrochemical holding company
LDPE (low density polyethylene LDPE /FB3000/LG chemical #)
Use: film grade
Characteristic notes: characteristics: transparency, tension and good processability
Important parameters: melt flow rate: 3 g/10min density: 0.92 g/cm3, notched impact strength: 120 tensile strength: 17 MPa, elongation at break: 500% VEKA softening point: 90 C embrittlement temperature: -76 C.
Manufacturer: Korea LG chemical company
LDPE (low density polyethylene LDPE /FB2000/LG chemical #)
Purpose: film grade
Feature remark: features: transparency, tension and good processability.
Important parameters: melt flow rate: 2 g/10min density: 0.923 g/cm3, notched impact strength: 150 tensile strength: 11 MPa, elongation at break: 480% VEKA softening point: 97 C embrittlement temperature: -76 C.
Manufacturer: Korea LG chemical company
LDPE (low density polyethylene LDPE /FB3500/LG chemical #)
Use: film grade
Feature notes: features: transparency and gloss
Important parameters: melt flow rate: 3.5 g/10min density: 0.924 g/cm3, notched impact strength: 100 tensile strength: 10 MPa, elongation at break: 400% VEKA softening point: 95 C embrittlement temperature: -76 C.
Manufacturer: Korea LG chemical company
LDPE (low density polyethylene LDPE /FB0500/LG chemical #)
Use: other
Characteristic notes: characteristics: crack resistance, heat shrinkage, good transparency
Important parameters: melt flow rate: 0.5 g/10min density: 0.921 g/cm3, notched impact strength: 300 tensile strength: 14 MPa, elongation at break: 600% VEKA softening point: 94 C embrittlement temperature: -76 C.
Manufacturer: Korea LG chemical company
LDPE (low density polyethylene LDPE /BB0305/LG chemical #)
Use: other
Characteristic notes: characteristics: Tortoise resistance, resistance to LV, and good impact resistance
Important parameters: melt flow rate: 0.3 g/10min density: 0.92 g/cm3, tensile strength: 17 MPa, elongation at break: 650% VEKA softening point: 95 C embrittlement temperature: -76 C.
Manufacturer: Korea LG chemical company
LDPE (low density polyethylene # LDPE) /5321UV/ Korea China
Purpose: film grade
Characteristic notes: characteristics: UV stability, machinability and excellent mechanical properties
Important parameters: melt flow rate: 3 g/10min density: 0.921 g/cm3, notched impact strength: 75 tensile strength: 11 MPa, elongation at break: 650% VEKA softening point: 88 degrees.
Manufacturer: Korea Hwa comprehensive chemical company
LDPE (low density polyethylene # high-pressure polyethylene) /D110/ Shanghai petrochemical
Use: other
Characteristic notes: polymer type: homopolymer method: extrusion
Important parameters: melt flow rate: 1.1 g/10min density: 0.92 g/cm3 tensile strength: 11.7 MPa
Manufacturer: Sinopec, Shanghai petrochemical Limited by Share Ltd
LDPE (low density polyethylene # high-pressure polyethylene) /J110/ Shanghai petrochemical
Use: other
Characteristic notes: polymer type: homopolymer method: extrusion
Important parameters: melt flow rate: 1.1 g/10min density: 0.92 g/cm3 tensile strength: 11.7 MPa
Manufacturer: Sinopec, Shanghai petrochemical Limited by Share Ltd
LDPE (low density polyethylene # LDPE) /1938Z300/ SABIC of Saudi Arabia
Use: other
Characteristic notes: high melting finger, low zero shear viscosity. Product trademark: SABIC
Important parameters: melt flow rate: 38 g/10min density: 0.919 g/cm3 VEKA softening point: 78 C
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene # LDPE) /1965Z300/ SABIC of Saudi Arabia
Use: other
Characteristic notes: high melting finger, low zero shear viscosity. Product trademark: SABIC
Important parameters: melt flow rate: 65 g/10min density: 0.919 g/cm3 VEKA softening point: 104 C
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene # LDPE) /2004TX33/ SABIC of Saudi Arabia
Purpose: film grade
Characteristic notes: good optical performance. Product trademark: SABIC
Important parameters: melt flow rate: 4.5 g/10min density: 0.921 g/cm3, notched impact strength: 15 tensile strength: 15 MPa, elongation at break: 500% VEKA softening point: 89 degrees.
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene # high-pressure polyethylene) /LDI-305YY/ Malaysia daito
Use: other
Characteristic notes: characteristics: good hardness, impact strength
Important parameters: melt flow rate: 6 g/10min density: 0.92 g/cm3, tensile strength: 10.6 MPa, elongation at break: 450% VEKA softening point: 87 DEG heat deformation temperature: -70 C.
Manufacturer: Malaysia daito company
LDPE (low density polyethylene # high-pressure polyethylene) /M015X/ Malaysia PETLIN
Use: other
Feature remark: additive: antioxidant
Important parameters: melt flow rate: 15 g/10min density: 0.92 g/cm3
Manufacturer: Malaysia PETLIN company
LDPE (low density polyethylene # LDPE) /F117-1/ Singapore polyolefin
Use: film grade
Important parameters: melt flow rate: 0.25 g/10min density: 0.923 g/cm3 tensile strength: 20 MPa fracture extension