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Molding part tells the determined according to the capacity of the design of the hollow products for extrusion blow molding. This is because injection blow molding is suitable for small vessels, and because of this design is 30L blow barrels, so the head selection accumulator head. The molding process is first HDPE materials after drying, sieving and conveying and weighing and mixture weighing the various additives and coloring agent, and the mixture is then cooled, through the feeding hopper, extrusion machine heating and plasticizing into the melt, extruded through a die, plastic melt molding, parison, mobile type placed blow molding mold, machine clamping, by injecting compressed air blown molding, mold, and die shape of hollow plastic products, take out the products, the edges of the products of pruning cut edge and on the product sealing of inspection, finished product is obtained. The pretreatment process includes drying, sieving, conveying weighing and mixing.. Select the hopper and feeding way of the material. This design using meshing twin screw extrusion blow molding machine, with than single screw plasticizing capacity, replacing the granulation process, the twin screw extrusion blow molding machine screw parameters were determined, including screw diameter and length to diameter ratio, compression ratio, screw length, length of the feeding section, melting length, length, depth of spiral groove, thread pitch, helix angle, center distance, thread head count, thread width, meshing angle, screw speed and thickness of thread, the screw and the machine barrel clearance and barrel material parameters. According to the determination of screw parameters calculated its production capacity, and then determine the die parameters, including die diameter, blown ratio, from the die swell ratio, die gap and the die shape length and other parameters. Determine the form and exhaust gas form, and determine the molding temperature and molding cycle, forming temperature, including the billet temperature, mold temperature.
The pneumatic network transmission part tells the network combined form, which can be determined by pneumatic network transmission calculation.. Determine the main design parameters, selection and calculation to determine the feeding tube diameter and the equipment dimensions, the ventilation network flow and network pressure loss calculation, to correctly matching wind engine and the motor, to develop a reasonable operating rules to ensure ventilation network economy can work reliably. Its main design parameters include the transport capacity, transport concentration, the diameter of the conveying pipe and the air velocity. This design uses the positive pressure.
Equipment selection and part tells the story according to the molding part and the pneumatic network transmission part which is determined and the calculation of the parameters of the design need of equipment type selection, including extrusion blow molding machine, far infrared electric heating drying box, a vibration sieve, pneumatic conveying system, high-speed mixer, low pressure air compressor and plastic crusher.
The material balance part to determine the working time, product specifications, cycle time and extrusion blow molding equipment. The output of the various processes and the loss and the waste were calculated..
Part of energy in the energy calculation of energy balance is the balance between heat were calculated through the calculate and determine the extrusion blow molding of the coolant volume, including extrusion blow cooling water volume and the mold cooling water volume. Finally, the power consumption of all equipment is calculated, including each qualified product, every class, daily and every year etc..
Technology design of production organization and personnel for the choreography workshop, a workshop on water supply, water supply and drainage are outlined. Finally, generated in the production process of the waste problem.
Economic accounting of raw materials, product packaging, depreciation of equipment, installation of plant, workshop water and electricity, wages, annual total cost, enterprise management fees, profits, taxes, product sales price were calculated.
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