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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) /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