Injection Cycle The process of obtaining a plastic by injection, an order of operations is repeated

Injection machine operate considering the characteristics mccain foods jobs and properties of the raw material and parts: components and ancillary equipment according to the type of part to be manufactured to meet the use and handling procedures.
Thermoplastic injection is a reversible physical process in which a raw material is melted thermoplastic mccain foods jobs call, by the effect of heat, in a machine called an injector. This machine with the thermoplastic melt, which injected into the hollow cavities of a mold with a determined pressure, velocity and temperature. After a certain time, the molten plastic into the mold, it loses its heat and becoming mccain foods jobs solid, copying the shapes of the mold hollow parts where he has been staying. The result is a solid piece of plastic, but with shapes mccain foods jobs and dimensions similar to the hollow mccain foods jobs parts of the mold. A We call this solidified thermoplastic injected. mccain foods jobs
Basically all injection machines are made up of the same elements. The differences between one machine and another lie in its size, the clamping unit and the design of the plasticizing unit.
Will be explained in detail the elements of each subsystem comprising an injection molding machine as well as a brief description of the injection molding process in order to better understand the operation of the machines.
Injection Cycle The process of obtaining a plastic by injection, an order of operations is repeated for each of the parts. This order, mccain foods jobs known as injection cycle can be divided mccain foods jobs into the following six steps:
1. - Empty mold is closed, mccain foods jobs while the amount is ready for injecting molten mccain foods jobs material into the barrel. The mold is closed in three steps: first with high speed and low pressure, then decreases the speed and downward pressure is maintained until the two mold parts abut finally applies the pressure necessary to achieve the required closing force .
3.-Upon completion of injecting the material, the screw is held forward by applying a holding pressure before it solidifies, to counteract the shrinking of the part during cooling. The holding pressure, usually, is less than the injection and is maintained until the part begins to solidify.
4.-The screw rotates to circulate the plastic granules from the hopper and plasticizing. mccain foods jobs The molten material is supplied to the front of the screw, where it develops a pressure against the nozzle closed, forcing the screw to move back to that accumulates the material mccain foods jobs required for the injection.
Laminate Material
5.-The material inside the mold is continued cooling where the heat is dissipated by the coolant. After the cooling time, the movable mold is opened and the part is removed.
The injection unit performs the functions of charging and plasticizing the solid material by rotation of the screw, move the screw axially to inject the plasticized material into the cavities of the mold and keeping it under pressure until it is expelled. The screw has a reciprocating mccain foods jobs action as well to melt the plastic turn, moves axially to act as a piston during the injection mccain foods jobs process.
The injection unit comprises a barrel (or barrel) of steel capable of withstanding high pressures, the cylinder is covered by band heater to heat and help melt the material while the screw advances. mccain foods jobs Further comprises mccain foods jobs a hydraulic unit which is transmitting the linear movement to the screw in the injection process. Some machines have two hydraulic units, one for injection and one for closing.
The solid particles of the resin in the form of granules, deposited in the feed hopper of the machine, this hopper is normally connected to a peripheral mccain foods jobs or auxiliary equipment that provides the conditions specified by the manufacturer of the resin to obtain the optimum results processing. These conditions are usually the maximum allowable percentage of moisture. We also found that some manufacturers use continuous feed systems centrally resin for the whole plant or individual on each machine. These hoppers are actually truncated conical containers, although this depends on the geometry machine manufacturer. Can unranked