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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 # LDPE) /FH 20/ of Italy
Use: film grade
Characteristic note: good drop hammer
Important beters: melt flow rate: 1.1 g/10min density: 0.922 g/cm3, tensile strength: 20 MPa, elongation at break: 550% VEKA softening point: 93.9 C embrittlement temperature: -75 C.
Manufacturer: Italy Eni
LDPE (low density polyethylene # LDPE) /2102TX00/ SABIC of Saudi Arabia
Use: film grade
Feature remark: high pressure drop, high output. Product trademark: SABIC
Important beters: melt flow rate: 1.9 g/10min density: 0.921 g/cm3 notch impact strength: 20 tensile strength: 17 MPa breaking elongation: 500%
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene # LDPE) /2200TC12/ SABIC of Saudi Arabia
Purpose: film grade
Feature remark: good optical perbance. Product trademark: SABIC
Important beters: melt flow rate: 0.3 g/10min density: 0.922 g/cm3 notch impact strength: 30 tensile strength: 22 MPa breaking elongation: 500%
Manufacturer: Saudi Basic Industry Company
LDPE (low density polyethylene LDPE # /NA205000/ Leander Basil)
Use: other
Important beters: melt flow rate: 16 g/10min density: 0.918 g/cm3, tensile strength: 10.3 MPa, elongation at break: 640% flexural strength: 212 MPa hardness: 56 VEKA softening point: 85 degrees.
Manufacturer: Liane Basel Industrial Corporation
LDPE (low density polyethylene LDPE # /NA951080/ Leander Basil)
Use: other
Important beters: melt flow rate: 2.2 g/10min density: 0.92 g/cm3, tensile strength: 10.3 MPa, elongation at break: 600% VEKA softening point: 90 C embrittlement temperature: -76 C.
Manufacturer: Liane Basel Industrial Corporation
LDPE (low density polyethylene # high-pressure polyethylene) /ESD C 700 A/ RTP
Use: other
Characteristic notes: electrical properties
Important beters: density: 1.04 g/cm3 molding shrinkage: 2.5% tensile strength: 10.3 MPa bending strength: 13.8 MPa flexural modulus: 345 MPa
Manufacturer: RTP company, USA
LDPE (low density polyethylene # LDPE) /665-2 BL/ Comai in Columbia
Use: other
Feature remark: additive: titanium dioxide 70%
Important beters: melt flow rate: 50 g/10min
Manufacturer: Columbia Comai company
LDPE (low density polyethylene # LDPE) /665-2 BP/ Comai in Columbia
Use: other
Feature remark: additive: titanium dioxide 70%
Important beters: melt flow rate: 6 g/10min
Manufacturer: Columbia Comai company
LDPE (low density polyethylene # LDPE) /JM314A/ Japan Marine
Use: other
Characteristic notes: low density
Important beters: melt flow rate: 1.5 g/10min density: 0.921 g/cm3, tensile strength: 16 MPa, elongation at break: 620% flexural strength: 170 MPa hardness: 52 VEKA softening point: 95 C embrittlement temperature: -70 C
Manufacturer: Japan Offshore Oil Resources Development Co., Ltd.
LDPE (low density polyethylene # LDPE) /JM906A/ Japan Marine
Use: other
Feature notes: low density, general purpose
Important beters: melt flow rate: 21 g/10min density: 0.917 g/cm3, tensile strength: 9.8 MPa, elongation at break: 120% flexural strength: 93 MPa hardness: 47 VEKA softening point: 85 C embrittlement temperature: -70 C
Manufacturer: Japan Offshore Oil Resources Development Co., Ltd.
LDPE (low density polyethylene # LDPE) /JMA01N/ Japan Marine
Use: other
Feature notes: low density, general purpose
Important beters: melt flow rate: 45 g/10min density: 0.915 g/cm3, tensile strength: 9.8 MPa, elongation at break: 130% flexural strength: 88 MPa hardness: 45 VEKA softening point: 79 C embrittlement temperature: -70 C
Manufacturer: Japan Offshore Oil Resources Development Co., Ltd.
LDPE (low density polyethylene # LDPE) /JMA07A/ Japan Marine
Use: other
Feature notes: low density, general purpose
Important beters: melt flow rate: 50 g/10min density: 0.916 g/cm3, tensile strength: 9.8 MPa, elongation at break: 150% flexural strength: 88 MPa hardness: 46 VEKA softening point: 79 C embrittlement temperature: -70 C
Manufacturer: Japan Offshore Oil Resources Development Co., Ltd.
LDPE (low density polyethylene # LDPE) /CA4918/ Cabot of the U.S.
Use: electronic appliances
Characteristic notes: electrical conductivity
Important beters: melt flow rate: 3.5 g/10min density: 1.06 g/cm3 tensile strength: 11.5 MPa breaking elongation: 22%
Manufacturer: Cabot Corporation of the United States
LDPE (low density polyethylene LDPE polymer /MBW2422/ Singapore #)
Use: film grade
Important beters: melt flow rate: 5 g/10min
Manufacturer: Singapore polymer Co., Ltd.
LDPE (low density polyethylene # high-pressure polyethylene) /EF2222/ Brazil Braskem
Use: film grade
Characteristic note: low density and low speed solidification crystal point can be Machinable
Important beters: melt flow rate: 2.2 g/10min notch impact strength: 70 tensile strength: 30 MPa fracture elongation: 420% flexural modulus: 170 MPa
Manufacturer: Brazil chemical company
LDPE (low density polyethylene # high-pressure polyethylene) /LD5010FC/ Brazil Braskem
Use: other
Characteristic notes: low speed solidified crystal point general no additive
Important beters: melt flow rate: 1.2 g/10min density: 0.92 g/cm3 tensile strength: 11 MPa breaking elongation: 800% VEKA softening point: 90 C
Manufacturer: Brazil chemical company
LDPE (low density polyethylene LDPE /175S/ Toyo #)
Use: film grade
Characteristic notes: characteristics: good optics and good processability, admixture of antistatic agent
Important beters: melt flow rate: 0.6 g/10min density: 0.921 g/cm3
Manufacturer: Dongyang Textile Co., Ltd., Japan
LDPE (low density polyethylene # high pressure polyethylene) /NUC8118/
