The injection molding for plastics is a process of of the fusion type, in which liquid plastic material is placed in a permanent form that mold, aided by a pressure injection on it. The molds are always kept closed hydraulically for these machines. The pressures are the order of lavorazione materie plastiche busto arsizio several hundred bars and the force required to keep the mold closed. Normally, the injection goes on at high pressures and temperatures that allow the flow of plasticized material already in the relevant section of the press.
A normal machine cycle follows these process:
Loading and fusion: the screw turns taking the material to fall from a hopper attached to the cylinder, the material moving towards the cylinder head, it melts due to heating of the cylinder and the accumulation of plastic material of the friction in the front of the cylinder is back screw determining the amount of material to be injected.Closing and locking of the mold. The two molds are fast approaching low pressure and a few tenths of a distance iniezione materie plastiche busto arsizio are locked in a position of maximum clamping force.Injection: the screw is applied to a speed controlled by the program, with free use of the hydraulic pressure available. The screw, moving quickly forward, like a piston, forces the molten material through the nozzle in the mold cavity. Keeping in pressure, the screw continues to be pushed forward usually with a lower pressure than the injection, keeping the pressure on the material until it has solidified.Pressure release screw.Rotation of the screw to see preparation for the new cycle "loading and melting.Mold Opening and extraction of the pieces.
The parts obtained in some cases requiring ancillary operations such as removal of the material injection attacks (sprue), deburring, drilling holes, etc., but often are perfectly finished. E 'possible to realize the co-molded metal inserts or threaded lavorazione materie plastiche Piemonte steel details that at the end of the process, will be firmly embedded in the piece.
Our value added is, however, the full and dedicated service to all our customers that makes our competitive and ever-expanding reality.
Radice Stampi & Co thanks to his many years of experience in mold making and molding of plastics, is able to meet different market sectors.
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