Wuhan Handern EVOH cast film

DATE：2020/10/20 8:39:14 / READ： / SOURCE：This station

Wuhan Hyundai EVOH cast film

       The EVOH flow film production process equipment is relatively simple, and the equipment investment is relatively small. The film thickness is usually about 20um. The process is relatively mature. As mentioned above, the product is generally not suitable to be used alone, and can only be used as a barrier layer for high barrier multilayer films. www.handern.com Cast film equipment
       Compared with PP and PE, the molding conditions of EVOH cast film have stricter control on the water content and molding temperature of the resin.
       EVOH resin is easy to absorb moisture and needs to be dried before molding. Generally, it is pre-dried at 100-110°C for 2 to 3 hours in a drying oven or a hot air circulating dryer. www.handern.com Cast film equipment
       If EVOH resin is heated for a long time and stays in the extruder, the resin will change with time and a gel phenomenon will occur. Therefore, before the molding is finished, a small amount of lubricant should be added to the extruder and the melt viscosity will be higher. For high polyolefin, extrude the EVOH resin in the extruder to prepare for restarting.
       3. Biaxial stretching process to produce EVOH film
      The process is complicated, the equipment investment is high, and the film thickness is above 10um. Under the same mechanical properties, the biaxially oriented film has higher strength than the cast film, and it is generally not used alone. It is mainly used for high barrier multilayer composite materials. Barrier layer. The single-layer EVOH film has poor heat-sealability, and it has heat-sealability after secondary processing. www.handern.com Cast film equipment
      4. Co-extruded EVOH composite film
      The EVOH co-extrusion production line has co-extrusion casting method and co-extrusion blow molding method. The co-extrusion casting method equipment is produced in three countries abroad, Germany’s Barmac and Caifenhaohan, Italy’s Po'lytype and Prandi SPA, and Austria’s Lenzing Company, Davis Standard Company of the United States, etc. The manufacturers of co-extrusion blow molding machines include Barmac, Caifenhaoshe, etc. The extruder is equipped with nylon, EVOH
The screw, head connector, and head of PO and PO are specially designed for EVOH. Generally have the following characteristics: www.handern.com cast film equipment
     1) Extruder: L/D=27, capable of processing different types of polymers, with three different types of screws, which can be matched with a three-component five-layer film production line.
     2) Blocking the main core layer: The extruder is equipped with screws that can process nylon, EVOH and PO. All melt channels are designed and installed according to the requirements of EVOH extrusion.
     3) Filter: The pipeline is streamlined, which can avoid the usual deposition of impurities, especially heat-sensitive materials, such as EVA, nylon, EVOH, when passing through, without removing the head and other parts, the filter insert can be replaced. www.handern.com Cast film equipment
    4) Machine head: It can provide different film components with the machine head, such as AB, AB+ adhesive layer, ABC, ABA, ABCD, ABCDA, ABCBD.www.handern.com cast film equipment

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