TPV 271-64

长期供应美国三都坪 TPV 271-64 价格合理,诚信经营，可全国供货（广东省内 免费送货上门）。

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注射速度影响注塑机成型制品

注射时，为了使熔料及时充满型腔，注塑机除了有足够的注射压力外，还应有一定的注射速度，以保证熔料有较快的流速。生产时，选择合理的注射速度是保证塑料制品质量的一个重要因素。通常，低速注射熔料，充模时间长，制品容易出现熔接痕、密度不均匀和残余应力大等缺陷，特别是对加工温度范围较窄的结晶型塑料和薄壁制品表现得更显著。

高速注射虽然可以减少模腔内的熔料温差，改善压力传递效果，得到密度均匀、应力小的精密制品，并缩短成型周期，但是，过高的注射速度使得熔料流经喷嘴时，产生大量的摩擦热，可能引起塑料产生分解和变色，以及吸人气体和排气不良等弊病，直接影响制品的表面质量，同时，对程控的要求更高。

目前，注射速度有不断提高的趋势。因为提高注射速度不仅能缩短注射时间，而且还能在较低的模温下获得优质制品，并缩短成型周期。尤其在注射成型各种薄壁长流程制品时，高注射速度是获得优质制品的先决条件。为了适应不同塑料和不同结构制品加工的要求，注塑机的注射速度也有一定的调节范围。注射速度的调节可通过控制进入注射油缸压力油的流量来实现。此外，目前还采用多级注射以适应制品结构的要求。

部分型号部分物性表

LDPE (low density polyethylene LDPE #) Chevron /1003/ Phillips
Uses: other
Characteristic note: excellent flexibility, moderate release agent, good warpage resistance
Important beters: melt flow rate: 13 g/10min density: 0.917 g/cm3 tensile strength: 9 MPa elongation at break: 550% bending modulus: 200 MPa hardness: 46 VEKA softening point: 86 DEG C embrittlement temperature: -52 DEG C
Manufacturer: Chevron Phillips chemical company (USA)
LDPE (low density polyethylene # LDPE) /752A/ DuPont dow
Uses: other
Note: includes two characteristics of smoothing agent and anti adhesion agent high level 21 CFR 177.1520 (c) 2.1
Important beters: melt flow rate: 6 g/10min density: 0.922 g/cm3 tensile strength: 13.4 MPa, elongation at break: 500%
Manufacturer: Dow DuPont Co
LDPE (low density polyethylene LDPE #) /LD120AM/ M.Holland
Uses: other
Features: good processability, good strength, good toughness
Important beters: melt flow rate: 0.5 g/10min density: 0.922 g/cm3 tensile strength: 26.2 MPa, elongation at break: 250%
Manufacturer: American M.Holland company
LDPE (low density polyethylene LDPE #) /LD400/ M.Holland
Uses: other
Characteristic note: good processability, high cracking (stress, crack resistance), low temperature strength
Important beters: melt flow rate: 14 g/10min density: 0.916 g/cm3 tensile strength: 9.83 MPa elongation at break: 400% bending modulus: 190 MPa hardness: 50 VEKA softening point: 86.1 DEG C
Manufacturer: American M.Holland company
LDPE (low density polyethylene # LDPE) /EB-853/72 (Films) / Brazil Braskem
Uses: other
Characteristics: * low density * low speed solidification point * optical property * medium resistance to caking * medium smoothness
Important beter: melt flow rate: 2.7 g/10min density: 0.923 g/cm3
Manufacturer: Brazil chemical company
LDPE (low density polyethylene # high-pressure polyethylene) /EF2002/ Brazil Braskem
Uses: other
Characteristics: * dimensional stability * low density * high molecular weight * processability, good * good surface finish
Important beter: melt flow rate: 0.16 g/10min density: 0.92 g/cm3
Manufacturer: Brazil chemical company
LDPE (low density polyethylene # LDPE) /2201TH00W/ SABIC of Saudi Arabia
Uses: other
Characteristics: good optical perbance, good peel strength, tear strength, good toughness, no additives
Important beters: melt flow rate: 0.85 g/10min density: 0.922 g/cm3 VEKA softening point: 96 DEG C
Saudi Basic Industries, Inc.
LDPE (low density polyethylene # LDPE) /HP4024W/ SABIC of Saudi Arabia
Application: film grade
Properties: low density, low friction coefficient, smoothness, optical property, good resistance to caking, good exfoliation, compliance of food contact
Important beter:
Saudi Basic Industries, Inc.
LDPE (low density polyethylene LDPE /FL20/ Italy's #)
Application: film grade
Characteristic note: good balance and machinability, good optical perbance.
Important beters: melt flow rate: 2.2 g/10min density: 0.921 g/cm3 tensile strength: 19 MPa elongation at break: 500% VEKA softening point: 90 DEG C embrittlement temperature: -75 DEG C
Manufacturer: Italy Eni
LDPE (low density polyethylene # LDPE) /2221FG/ Repsol of Spain
Uses: other
Characteristic note: antioxidant, acceptable for food contact, branch
Important beters: melt flow rate: 2.1 g/10min density: 0.922 g/cm3 tensile strength: 25 MPa elongation at break: 350% VEKA softening point: 95 light transmittance: 7%
Manufacturer: YPF of Spain
LDPE (low density polyethylene # LDPE) /PE-023/ Repsol of Spain
Uses: other
Characteristic note: high liquidity, compliance with food additives, no additives
Important beters: melt flow rate: 150 g/10min density: 0.916 g/cm3 hardness: 95 VEKA softening point: 72 DEG C
Manufacturer: YPF of Spain
LDPE (low density polyethylene # high-pressure polyethylene) /TS7010/ Brazil Triunfo
Uses: other
Features: food contact is acceptable, good processing stability, good thermal stability, ultra high molecular weight, low friction
Important beters: density: 0.922 g/cm3 tensile strength: 10 MPa elongation at break: 500% VEKA softening point: 91 DEG C
Manufacturer: Brazil Triunfo company
LDPE (low density polyethylene LDPE /FF22/ Italy's #)
Application: film grade
Characteristic note: good foam stability, easy thermal shrinkage and good mechanical properties.
Important beters: melt flow rate: 0.8 g/10min density: 0.921 g/cm3 tensile strength: 22 MPa elongation at break: 600% VEKA softening point: 91 DEG C embrittlement temperature: -75 DEG C
Manufacturer: Italy Eni
LDPE (low density polyethylene LDPE #) /SBF0323HC/ Braskem
Application: film grade
Characteristic note: high molecular weight, optical properties, renewable resources, no additives
Important beters: melt flow rate: 0.32 g/10min density: 0.923 g/cm3 tensile strength: 30 MPa, elongation at break: 1000%
Manufacturer: American Braskem company
LDPE (low density polyethylene # high-pressure polyethylene) /666-000/ Maoming petrochemical
Uses: other
Characteristic note: high tensile strength, low shrinkage, good bonding perbance, no smooth agent and shedding agent
Important beters: melt flow rate: 3.9 g/10min density: 0.92 g/cm3 notched impact strength: 65 tensile strength: 9.19 MPa, elongation at break: 87%
Manufacturer: Sinopec group, Maoming Petrochemical Company
LDPE (low density polyethylene # high-pressure polyethylene) /LD100-BW/ Yanshan petrochemical
Purpose: wire and cable
Characteristic note: mechanics