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注塑工艺各工序的温度控制

1.料筒温度：

熔料温度是很重要的，所用的射料缸温度只是指导性。熔胶温度可在射嘴处量度或使用空气喷射法来量度。射料缸的温度设定取决于熔胶温度、螺杆转速、背压、射料量和注塑件周期。您如果没有加工某一特定级别塑料的经验，请从最低的设定开始。

为了便于控制，射料缸分了区，但不是所有都设定为相同温度。如果运作时间长或在高温下操作，请将第一区的温度设定为较低的数值，这将防止塑料过早熔化和分流。注塑件开始前，确保液压油、料斗封闭器、模具和射料缸都处于正确温度下。

2.熔料温度：

熔体温度对熔体的流动性能起主要作用，由于塑胶没有具体的熔点，所谓熔点是一个熔融状态下的温度段，塑胶分子链的结构与组成不同，因而对其流动性的影响也不同，刚性分子链受温度影响较明显，如PC、PPS等，而柔性分子链如：PA、PP、PE等流动性通过改变温度并不明显，所以应根据不同的材料来调校合理的注塑件温度。

3.模具温度：

有些塑胶料由于结晶化温度高，结晶速度慢，需要较高模温，有些由于控制尺寸和变形，或者脱模的需要，要较高的温度或较低温度，如PC一般要求60度以上，而PPS为了达到较好的外观和改善流动性，模温有时需要160度以上，因而模具温度对改善产品的外观、变形、尺寸，胶模方面有不可抵估的作用。

4.注射压力：

熔体克服前进所需的阻力，直接影响产品的尺寸，重量和变形等，不同的塑胶产品所需注射压力不同，对于像PA、PP等材料，增加压力会使其流动性显著改善，注射压力大小决定产品的密度，即外观光泽性。它没有固定的数值，而模具填充越困难，注塑件压力也增大。

部分型号部分物性表

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