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Extruders Plastic Robot
- Jun 01, 2017 -

Screw extruder is dependent on the rotation of the screw pressure and shear force, can make the material can be fully plasticized and even mixed, through the die molding.

Plastic extruders are also one of the types of plastic machinery. Extruder according to the direction of the head material and the angle of the screw center line, the machine can be divided into right angle head and bevel nose and so on. The head of the head is usually bolted to the fixed on the fuselage, the head of the mold inside the mold core seat, and then use the nut to be fixed in the nose of the nose port, the core of the core is also equipped with And the center of the mandrel and mandrel has holes, which act on the core. Depending on the type of pressurization, the extrusion process can be divided into two types: continuous extrusion and intermittent extrusion. The former equipment used for the screw extruder, the latter equipment for the plunger extruder. In this screw extruder can be roughly by virtue of the number of screws for the single screw extruder and multi-screw extruder.

The working mechanism of the screw extruder is to rely on the rotation of the screw produced by the pressure and shear force, can make the material can be fully plasticized and evenly mixed, through the die molding; so sometimes use an extruder can be completed at the same time Mixing, plasticizing and forming a series of processes, so as to continuous production. In addition, the working mechanism of the plunger extruder is mainly by the use of plunger pressure, the first plastic material in advance from the die extrusion to achieve the effect of forming. Material in the cylinder after the extrusion of the plunger will be returned, until the addition of a new round of plastic materials and then proceed to the next round of operation, this production process is discontinuous production, and the basic material can not be fully stirred As well as the mixing, in addition to the production of pre-plasticization, so in the actual production is usually not often used in this law, can only be applied to the poor mobility or viscosity is very large plastic, like nitrocellulose plastic this Plastic products of the molding process.

The plastic extruders can be categorized as twin screw extruders, single screw extruders, and rare multi-screw extruders and screwless extruders.

Extruder originated in the 18th century, Joseph Bramah (England) in 1795 made for the manufacture of seamless lead pipe manual piston extruder is considered the world's first extruder. Since then, during the first half of the nineteenth century, the extruder was basically only suitable for the production of lead pipes, macaroni and other food processing, brick and ceramic industries. In the development process as a manufacturing method, the first time there is a clear record of R.Brooman in 1845 for the application of the extruder to produce solid-wave glue patent. Gutebo's H. Bewlgy then improved the extruder and used it in 1851 to cover the copper wire of the first submarine cable between Dover and Calais. In 1879 the British M.Gray made the first patent to use the Archimedes spiral screw extruder. In the next 25 years, the extrusion method was gradually important, and gradually replaced by the electric manipulator of the previous manual extruder. In 1935 the German machinery manufacturer Paul Troestar produced an extruder for thermoplastics. In 1939 they developed a plastic extruder into a stage - modern single screw extruder stage.