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    • 塑料干燥机在塑料行业的重要性
    • 本站编辑:杭州默川塑料机械有限公司发布日期:2018-06-06 11:10 浏览次数:

    供料系统提供优质原料

      供料系统用辅助加工设备主要包括干燥、输送、计量、混合设备。

      塑料干燥机用于易吸湿材料的成型加工生产前的材料预处理,如ABS、聚甲醛(POM)、聚碳酸酯(PC)、尼龙(PA)、有机玻璃(PMMA)在聚烯烃类塑料某些加工过程中,为保证产品的质量也要对其进行高度干燥,如在无规共聚聚丙烯PP-R的管材生产和管件注塑成型及交联聚乙烯用聚乙烯原料也需将物料干燥到所需的含水量。在生产加工中根据产品对原材料含水量的要求,还要分别使用不同的干燥方式和干燥设备。对于填料和PVC等粒料常使用烘箱式干燥器.对于热敏性强的塑料采用旋转式双锥真空干燥器;连续性的干燥往往使用直接式料斗干燥机。

      对于送料系统,输送粉末料采用弹簧管式输送系统和罗茨鼓风机式的风送系统,而颗粒输送上料采用真空上料器。集中供料设备多适用于规模化、自动化的生产工艺。设备采用计算机集中控制,各种原料按比例通过计量装置称量后进入混合器。料斗均装有料位传感器,根据物料的多少可自动打开或关闭输送管道上的储料桶。集中供料系统的关键技术是电子秤的准确计量,能将所需物料按比例准确进料。

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      温度控制保证产品质量

      塑料加工过程中加热设备主要指用于挤出、注塑、压延等生产设备的机筒模具和压延辊的温度加热控制器,目前一般采用导热油电加热方式取代复杂的蒸汽加热方式。

      模温冷却器主要应用于注塑成型的模具温度冷却。一般在模具设计中均有冷却水通道。致冷机分有风冷式和水冷式,风冷式轻便,但换热能力低,水冷式换热量大,换热效果好,广泛被采用。

      回收利用降低生产成本

      塑料加工中边角废料所占比例为总生产量的5%~20%左右,可以说回收利用边角废料在一定程度上决定着企业的生存命脉。塑料加工企业对此越来越重视。目前应用较多的塑料粉碎机,分为适用于硬质产品、小体积产品的粉碎的设备;用于软质塑料泡沫塑料的回收造粒的粉碎设备;用于管材、型材较长制品的直接破碎造粒的粉碎机;用于废丝回收的团粒机。在塑料回收设备上,现在正朝着低噪音、易操作、集料斗连续管式输送出料的发展方向。

      对于大型制件的连续粉碎,为了避免塑料制件在粉碎机内长时间翻动切割,产生热量使塑料变为弹性体状态,难以粉碎的情况,开发出在粉碎机外壳带有水冷夹套的粉碎设备保证大型塑料制件破碎的连续操作和高效粉碎

    Supply system provides high quality raw materials

    Auxiliary processing equipment for feeding system mainly includes drying, conveying, metering and mixing equipment.

    The drying equipment is used for preprocessing of material before the molding of easy wetting materials, such as ABS, Polyoxymethylene (POM), polycarbonate (PC), nylon (PA), and organic glass (PMMA) in some processing of polyalkene plastics. To ensure the quality of the products, the quality of the products should also be highly dry, such as random copolymerized polypropylene. PP-R pipe production and pipe injection molding and crosslinked polyethylene polyethylene raw materials also need to dry the material to the required water content. In the process of production, different drying methods and drying equipment should be used according to the requirement of products for water content of raw materials. The oven type dryer is often used for the packing and PVC. The rotary double cone vacuum dryer is used for the heat sensitive plastic. The direct hopper drier is often used for the continuous drying.

    For the feeding system, the conveying material is made up of a spring pipe conveying system and a Roots blower type pneumatic conveying system, while the granular conveying material is provided with a vacuum feeder. Centralized feed equipment is suitable for large-scale and automated production processes. The equipment is centrally controlled by computers, and all kinds of raw materials are weighed into the mixer by measuring device in proportion. Hopper is equipped with material level sensor, according to the number of materials can automatically open or close the storage barrel on the conveying pipe. The key technology of the centralized feeding system is the accurate measurement of the electronic scale, which can accurately feed the required materials proportionally.

    Temperature control to ensure product quality

    In the process of plastic processing, the heating equipment mainly refers to the temperature heating controller for the extruding, injection and calendering equipment. At present, the heat conduction oil and electricity heating mode is generally used instead of the complex steam heating.

    The mold temperature cooler is mainly used for mold temperature cooling in injection molding. Generally, there are cooling water passages in the mold design. The refrigerating machine is divided into air-cooled and water-cooled, air-cooled and portable, but with low heat exchange capacity, large water cooled heat exchange and good heat exchange effect.

    Recovery and utilization to reduce production costs

    The proportion of side angle waste in plastic processing is about 5% ~ 20% of the total production, which can be said to determine the lifeblood of the enterprise to a certain extent. Plastic processing enterprises have paid more and more attention to this. The plastic pulverizer, which is widely used at present, is divided into crushing equipment suitable for hard products and small volume products; the pulverizing equipment for the recycling and granulation of soft plastic foam; the mill for direct crushing and granulation for long products of pipes and sections; and the pelletizing machine for waste silk recycling. On the plastic recycling equipment, it is now heading towards the development direction of low noise, easy operation, and hopper continuous pipe conveying and discharging.

    For the continuous crushing of large parts, in order to avoid the long time turning and cutting of the plastic parts in the mill, the heat makes the plastic into the elastic state, and it is difficult to comminence. The continuous operation and high efficiency comminution of the breakage of the large plastic parts in the shredder's shell is developed to ensure the crushing of the large plastic parts.