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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 LDPE #) /1068/ America flintcomb ash
Use: film grade
Characteristic notes: good processing performance, good heat resistance, sealing and optical properties
Important parameters: melt flow rate: 5.5 g/10min density: 0.922 g/cm3 tensile strength: 10 MPa breaking elongation: 400% hardness: 52 VEKA softening point: 96 C
Manufacturer: American flint Hill resources
LDPE (low density polyethylene LDPE #) /1059/ America flintcomb ash
Purpose: film grade
Feature notes: good processing applications: film applications, non abrasive packaging applications
Important parameters: melt flow rate: 6.5 g/10min density: 0.922 g/cm3 tensile strength: 11 MPa breaking elongation: 400% hardness: 400 VEKA softening point: 92 C
Manufacturer: American flint Hill resources
LDPE (low density polyethylene LDPE /FV-20-205-3/ #) Bulgaria Luke
Use: other
Important parameters: melt flow rate: 1.8 g/10min density: 0.919 g/cm3 tensile strength: 9.5 MPa breaking elongation: 500%
Manufacturer: Bulgarian Luke chemical company
LDPE (low density polyethylene LDPE /K-12-208-61/ #) Bulgaria Luke
Use: wire and cable
Important parameters: melt flow rate: 0.25 g/10min tensile strength: 15 MPa breaking elongation: 550% VEKA softening point: 90 C
Manufacturer: Bulgarian Luke chemical company
LDPE (low density polyethylene LDPE plastic #) /6320F/ Taiwan
Use: film grade
Characteristic notes: good machinability and mechanic nature
Important parameters: melt flow rate: 2.2 g/10min density: 0.921 g/cm3, notched impact strength: 115 tensile strength: 18 MPa, elongation at break: 600% VEKA softening point: 93 C embrittlement temperature: -75 C.
Manufacturer: Limited by Share Ltd of Taiwan plastic industry
LDPE (low density polyethylene LDPE plastic #) /6534F/ Taiwan
Use: other
Characteristic notes: characteristics: good optical, high tensile, high slippery dose, medium anti viscosity.
Important parameters: melt flow rate: 5 g/10min density: 0.924 g/cm3, notched impact strength: 70 tensile strength: 14 MPa, elongation at break: 500% bending modulus: 176 MPa hardness: 52 embrittlement temperature: -70 C.
Manufacturer: Limited by Share Ltd of Taiwan plastic industry
LDPE (low density polyethylene LDPE plastic #) /6520G/ Taiwan
Use: other
Characteristic notes: characteristics: good fluidity, good adhesion and low necking.
Important parameters: melt flow rate: 8 g/10min density: 0.916 g/cm3, tensile strength: 10 MPa elongation at break: 500% bending modulus: 107 MPa hardness: 52 VEKA softening point: 85 C embrittlement temperature: -70 C
Manufacturer: Limited by Share Ltd of Taiwan plastic industry
LDPE (low density polyethylene # LDPE) /F 2529/ Braskem in Brazil
Purpose: film grade
Characteristic note: product trademark Braskem, with good mechanical and optical properties
Important parameters: melt flow rate: 2.5 g/10min density: 0.929 g/cm3, tensile strength: 13 MPa, elongation at break: 570% VEKA softening point: 106 C embrittlement temperature: -73 C.
Manufacturer: Brazil chemical company
LDPE (low density polyethylene LDPE #) /CC8207/ Borealis
Use: food grade
Characteristic notes: good anti UV, low density, recyclable materials
Important parameters: melt flow rate: 6 g/10min density: 0.92 g/cm3
Manufacturer: Nordic Chemical Co., Ltd.
LDPE (low density polyethylene LDPE #) /FT5244/ Borealis
Use: other
Feature notes: antioxidants, good processing, low density, recyclable materials, slippery
Important parameters: melt flow rate: 1.2 g/10min density: 0.924 g/cm3 tensile strength: 28 MPa breaking elongation: 270% VEKA softening point: 95 C
Manufacturer: Nordic Chemical Co., Ltd.
LDPE (low density polyethylene # high-pressure polyethylene) /7-20/ Slovakia slovnaft
Use: other
Characteristic notes: compliance, general purpose of food contact
Important parameters: melt flow rate: 7 g/10min density: 0.915 g/cm3 hardness: 42 VEKA softening point: 88 C
Manufacturer: Slovakia slovnaft company
LDPE (low density polyethylene LDPE /LDE300/ Australia Qenos #)
Use: other
Characteristic notes: high definition, high gloss, high rotation difference, high strength
Important parameters: melt flow rate: 2 g/10min density: 0.924 g/cm3 tensile strength: 21 MPa
Manufacturer: Qenos, Australia
LDPE (low density polyethylene LDPE /LD1108/ Australia Qenos #)
Use: other
Feature notes: good processing, high impact resistance, low skid
Important parameters: melt flow rate: 0.3 g/10min density: 0.924 g/cm3 tensile strength: 22 MPa
Manufacturer: Qenos, Australia
LDPE (low density polyethylene # LDPE) /2100TN00W/ SABIC of Saudi Arabia
Use: film grade
Characteristic notes: good peeling toughness good
Important parameters: melt flow rate: 0.33 g/10min density: 0.921 g/cm3 VEKA softening point: 93 C
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene # LDPE) /2101TN00W/ SABIC of Saudi Arabia
Use: film grade
Characteristic notes: good peeling toughness good
Important parameters: melt flow rate: 0.85 g/10min density: 0.921 g/cm3 VEKA softening point: 93 C
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene # LDPE) /CA-3130A/ Repsol of Spain
Use: other
Characteristic notes: Antioxidants
Important parameters: melt flow rate: 0.4 g/10min density: 0.933 g/cm3 fracture elongation: 550%
Manufacturer: YPF of Spain
LDPE (low density polyethylene # LDPE) /CA-3131A/ Repsol of Spain
Use: other
Characteristic notes: Antioxidants
Important parameters: Melt