产品详情
“十年老店,完备售后,信誉信赖” 是专业塑胶原料供应商
本司货源稳定充足,发货准时,交期和质量均有保障!
根据客户要求,可提供塑胶原料相关报告。如:ROHS(SGS)报告,UL认证,材质证明及物质安全资料表(MSDS)!
价格合理,诚信经营,可全国供货(广东省内 免费送货上门)。
欢迎来电咨询7*24全天候服务热线:13686017791 易小姐 QQ:335171600
针对加工工艺特点正确选择模温控制系统
不同原料性能不同,它们有着不同的加工工艺特点,模具温度对工件表质量流动性、收缩率、注塑周期的影响,是塑料加工制造中必须控制的因素。研究显示,24%的废品是由模具温度不当所致。为此,在从注塑、吹塑到挤塑的各种塑料加工领域中广泛采用了模温控制系统,以将模具加热到工作温度,并使模具温度保持在一定的精度范围。
然而,如果模具控制系统设计、选用不当,不但无法提高产品的成型效率,稳定产品品质和降低不良率,也致使其他设备自动化的改良失去意义。
正确选择适当的模温控制系统可以从以下几方面考虑。
确定塑料加工工艺要求的模具温度
各种塑料原材料要求的加工成型温度、模具温度不同。"各种塑料加工模具温度表"给出了一些主要塑料加工所需的模具温度。
确定模温机的传热介质类型
模温控制系统的工作原理为,泵浦驱动传热介质(通常为水或油)从装有内置加热器和冷却器的水箱中到达模具,再从模具回到水箱。控制器根据温度传感器测量的热流体温度,或/和模具内部温度,调节热流体的温度从而调节模具的温度。
根据使用的传热介质的类型,模温机为水式模温机、加压水模温机或油式模温机。
一般水式模温机控制温度范围较低,油式模温机控制温度范围较高。水式模温机的工作温度为90℃,加压水式模温机的工作温度为160℃~180℃,油式模温机用于工作温度≥150℃的场合,最高工作温度为350℃。
就传热介质本身而言,以水作传热介质经济环保,即使发生泄漏,也可直接排放,不会污染环境,但水容易使水箱、流道腐蚀和结垢,所以除需做防腐蚀剂预处理外,在使用中还要定期除锈。以导热油作传热介质,导热系数只有水的1/3,成本相对较高,容易结焦。
特殊应用环境也是选择模温机需要考虑的因素。如油温机在光学镜片的加工中受到限制,因为油受热蒸发,会影响光学镜片的品质。
温度控制精度
要使注塑加工中模具的温度保持基本恒定,其关键是要控制模具内的热传导平衡。模具内部由热塑性塑料带来的热量,通过热传导传递给模具,传导至模具的热量一部分通过热辐射直接在空气中散失,另一部分通过与模温机的热交换,传递给传热介质(水或油)。
模温控制的实现,有基于热流体温度的模温控制、基于模具温度的模温控制,以及联合模温控制几种方式。用户应根据实际情况,考察模温机操作的实现,选择能够满足自己温度控制精度要求的产品。
基于热流体温度模温控制,控制面板上显示的温度和模具温度并不一致,由于注射周期、注射速度、熔化温度及环境温度等因素没有得补偿,模具的温度波动相对较大。基于热流体温度模温控制可以满足大多数情况要求,也是最常见方法。
基于模具温度的模温控制,由温度传感器安装于模具内部,控制面板上设置、显示温度模具温度一致,适用于温度控制精度要求较高的情况。
联合控制综合了以上方法,适用于高精度塑料加工制造。在联合控制中,安放温度传感器在模具中的位置必须考虑模具形状、结构及冷却通道的位置,将其放置在对加工件质量起决定性作用的地方。
目前,绝大多数模温机采用了PID控制技术,对影响模具温度的各种因素进行补偿。
在模温机选配过程中,加热功率和媒体循环的压力、流量也都是必须考虑的因素。
加热能量的计算
其中:
P模具所需加热能量(kW)
W模具重量(kg)
C模具比热(kcal/kg℃)
T1所需模温(℃)
T2开始生产时模温(℃)
S安全系数,取值1.5~2
t由开始生产达到所需模温的时间(h)
媒体循环所需压力
模具越细,所需要的压力越大,且需加上流道的阻抗。
P=0.1×H×α
P压力(kg/cm2)
H水头高度(m)
α传热媒体的比热。水=1;油=0.7~0.9
媒体循环所需流量
流量越大,传热效果越好。
L媒体循环所需流量(L/min)
Q模具需移出或移入的热量(kcal/h)
c传热媒体的比热。水=1;油=0.7~0.9
ΔT循环媒体进出模具的温差(℃)
α媒体循环的比重
通常,模温机专业厂商会提供其产品泵浦特性以及模温机型号功能比较,这些都是选择模温机的参考。以晏邦产品进行说明。
·确定需要达到的温度范围:"各种塑料加工模具温度表"提了一些主要塑料加工所需的模具温度,用户需根据加工工艺要求,确定需要达到的温度范围。
·传热介质的选择:一般水温机控制温度范围较低,油温机控制温度范围较高。就模温机而言,如需采用水为传热介质,应选择YBM-D系列;如采用油或水为传热介质,则应选择YBM-I型。
·根据"型号功能表",在允许的最长加热时间内选择最适合的型号。
例如:模重120kg,模温需要在25分钟内达到120℃,YBM-1IH(高温型)为最佳选择;
模重120kg,模温需要在10分钟内达到120℃,YBM-2IH(高温型)为最佳选择;
模重120kg,模温需要在25分钟内达到80℃,YBM-1D或YBM-1I(一般型)为最佳选择。
部分型号部分物性表
PA6 (polycaprolactam # nylon 6) /PA6G30M1/ Shanghai migsam
Use: Electrical and electrical components, automobile parts
Characteristic notes: 30% enhanced toughening
Important beters: melt flow rate: 4.49 g/10min notched impact strength: 30.31 tensile strength: 147.01 MPa elongation at break: 7.93% flexural strength: 203.71 MPa flexural modulus: 5841 MPa
Manufacturer: Shanghai Mei Shan Plastic Co., Ltd.
PA6 (polycaprolactam # nylon 6 /PA6 73G15L-NC010/ Pier One)
Use: other
Feature notes: glass fabric reinforced material, 15% packing by weight
Important beters: density: 1.22 g/cm3 notched impact strength: 64 tensile strength: 103 MPa, elongation at break: 5% flexural strength: 162 MPa, bending modulus: 4140 MPa, hot debation temperature: 193 degrees, filling content: 11%.
Manufacturer: Pier One, USA
PA6 (polycaprolactam # nylon 6) /A1CF6-H/ Zhejiang toshiji
Use: other
Note: the PA6, 30% characteristics of short carbon fiber reinforced, heat stabilized, antistatic
Important beters: density: 1.27 g/cm3, molding shrinkage: 0.1% notched impact strength: 9, tensile strength: 240 MPa, bending strength: 330 MPa, bending modulus: 18000 MPa, hot debation temperature: 205 degrees.
Manufacturer: Zhejiang Juner New Material Co Ltd
PA6 (polycaprolactam # nylon 6) /BG2010-NC/ crystal on Shanghai
Use: other
Feature remark: high strength, high rigidity, hardness, and dimensional stability are required. Instead of French enhanced PA6, it was designated by foreign customers.
Important beters: density: 1.38 g/cm3 water absorption: 5.9% molding shrinkage: 0.52% notched impact strength: 10 tensile strength: 183 MPa, elongation at break: 3.2% bending strength: 275 MPa flexural modulus: 8780 MPa, hot debation temperature: 207 C, filling content: 30%.
Manufacturer: Shanghai diurn Engineering Plastics Technology Co., Ltd.
PA6 (polycaprolactam # Xinhui mestt nylon 6) /M52800C/
Use: other
Important beters: density: 1.14 g/cm3 water absorption: 0.06%
Manufacturer: Guangdong Xinhui Meida nylon Limited by Share Ltd
PA6 (polycaprolactam # nylon 6) /C35/ Hengdian tospo
Use: other
Feature notes: features: 35% enhanced filling, dimensional stability
Important beters:
Manufacturer: Hengdian Group Engineering Plastics Co., Ltd.
PA6 (polycaprolactam # nylon 6) /C15/ Hengdian tospo
Use: other
Feature notes: features: 15% enhanced filling, dimensional stability
Important beters:
Manufacturer: Hengdian Group Engineering Plastics Co., Ltd.
PA6 (polycaprolactam # nylon 6) /C25/ Hengdian tospo
Use: other
Feature notes: features: 25% enhanced filling, dimensional stability
Important beters:
Manufacturer: Hengdian Group Engineering Plastics Co., Ltd.
PA6 (polycaprolactam # nylon 6) /B9709/ Nanjing Li Han
Use: other
Characteristic notes: filler: M45 features: mineral enhanced flame retardancy
Important beters:
Manufacturer: Nanjing Li Han Chemical Co., Ltd.
PA6 (polycaprolactam # nylon 6 /MR-401/ Shanghai Celluloid)
Use: other
Characteristic notes: features: 40% mineral enhancement.
Key beters: notch impact strength: 9 tensile strength: 75 MPa bending strength: 110 MPa flexural modulus: 4040 MPa thermal debation temperature: 80 centigrade filler content: 40%
Manufacturer: Shanghai Celluloid factory
PA6 (polycaprolactam # fuyuda plasticizing nylon 6) /70/30/
Use: other
Important beters: density: 1.075 g/cm3 water absorption: 1.1% notched impact strength: 900 tensile strength: 40 MPa, elongation at break: 250% flexural strength: 60 MPa, bending modulus: 1200 MPa, hot debation temperature: 145 degrees.
Manufacturer: Cixi Fuda plasticizing Co., Ltd.
PA6 (polycaprolactam # fuyuda plasticizing nylon 6) /80/20/
Use: other
Important beters: density: 1.105 g/cm3 water absorption: 1.1% notched impact strength: 500 tensile strength: 50 MPa, elongation at break: 150% flexural strength: 75 MPa, bending modulus: 1500 MPa, hot debation temperature: 160 degrees.
Manufacturer: Cixi Fuda plasticizing Co., Ltd.
PA6 (polycaprolactam # nylon 6) /GPA6-30/ Jiangsu Tianyuan
Use: other
Feature remark: 30% glass fiber reinforced
Important beters: density: 1.3 g/cm3 notch impact strength: 16 tensile strength: 150 MPa bending strength: 200 MPa thermal debation temperature: 200 centigrade
Manufacturer: Jiangsu Tianyuan plastics industry and Trade Co., Ltd.
PA6 (polycaprolactam # nylon 6) /ZRGPA6-35/ Jiangsu Tianyuan
Use: other
Characteristic notes: toughening and strengthening 35%
Important beters: density: 1.35 g/cm3 notch impact strength: 20 tensile strength: 110 MPa breaking elongation: 5% bending strength: 140 MPa thermal debation temperature: 180 C
Manufacturer: Jiangsu Tianyuan plastics industry and Trade Co., Ltd.
PA6 (polycaprolactam # nylon 6) /TP-4208/ Taiwan ziseng
Use: other
Important beters: melt flow rate: 102.1 g/10min tensile strength: 71.4 MPa bending strength: 119.3 MPa flexural modulus: 3197 MPa thermal debation temperature: 69.1 C
Manufacturer: Taiwan Jisheng industrial Limited by Share Ltd
PA6 (polycaprolactam # nylon 6) /1015B/ Thailand Ube
Use: other
Important beters: density: 1.14 g/cm3 water absorption: 1.8% notched impact strength: 69 tensile strength: 77 MPa, elongation at break: 200% bending strength: 112 MPa flexural modulus: 2500 MPa hardness: 120 thermal debation temperature: 65 C.
Manufacturer: Japan UBE Asia Chemical Corp]
PA6 (polycaprolactam # nylon 6) Germany BASF /8200/
Use: other
Feature notes: Ultramid?
Important beters: density: 1.13 g/cm3 water absorption: 1.6% oxygen index: 24% flexural modulus: 2826.85 MPa hardness: 119
Manufacturer: German Basf Inc
PA6 (polycaprolactam # nylon 6) Germany BASF /8253/
Use: other
Feature notes: Ultramid?
Important beters: density: 1.09 g/cm3 water absorption: 1.5% bending strength: 86.9 MPa flexural modulus: 2213 MPa hardness: 82 thermal debation temperature: 55 C
Manufacturer: BASF, Germany

