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Extruders An Analysis Of The Principle Of Plastic Extruder
- Aug 01, 2017 -

Extruders An Analysis of the Principle of Plastic Extruder

An Analysis of the Principle of Plastic Extruder

A plastic extruder is good, because it is a reasonable planning, the principle of winning, so since the advent of plastic extruder, selling is not bad, cute. The principle of the twin-screw extruder and other company's products are the same principle, but the machine plan there are a lot of innovation, the following just tell you in detail:

Plastic extruder is also one of the varieties of plastic machinery. Extruder according to the direction of the head material and the angle of the screw base line, the machine can be diagonal right angle head and bevel number. The head of the shell is generally fixed with bolts on the fuselage above the head of the mold is rich in mold base, and then use the nut to be fixed in the nose of the nose port, the core of the core also installed There is a core, and the core and the core base of the base has a hole, its role for passing through the core. According to the different methods of pressurization methods, making the extrusion skills can be divided into two kinds of dividends 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 mechanism of the screw extruder is to rely on the rotation of the screw rotation and shear force, can make the material can be fully plasticized and evenly mixed, after die molding; so sometimes use an extruder can be completed together Mixing, plasticizing and forming a series of skills, and then a series of production. In addition, the plunger-type extruder operating mechanism is mainly by the use of plunger pressure, the first plastic before the end of the material from the die extrusion and reach the role of forming. Material in the barrel of the material in the extrusion after the end of the plunger will be back, and add a new round of plastic materials and then proceed to the next round of operation, this production skills attributed to not produce, and the material can not be sufficient Mixing and mixing, in addition to the production of the need for pre-plasticization, and thus in the practice of production generally do not often use this method, can only be applied to the very poor mobility or viscosity is very large plastic, like nitrocellulose plastic The molding of plastic products.

The operating principle of the extruder:

Add the water or the appropriate liquid to the powder of the material and mix it continuously. Mix the material with a high extrusion pressure from the porous head or metal mesh. Generally put the information into the cylindrical container in the future, with the screw extrusion information. In the future use of frequency conversion skills, the pressure can be manipulated, and then be able to select the most appropriate linear speed. Single screw extruder principle Single screw generally in the useful length is divided into three sections, according to the screw diameter large screw pitch screw to determine the useful length of three sections, generally divided by one third of each distinction. The last thread of the mouth is called the transport section: the material can not be plasticized here, but it is necessary to preheat and press the squeeze. In the past, the old extrusion theory thought that the material was loose and later proved that the material practice was Solid plug, that is to say that the material is kneaded after a solid like the same plug, so just to complete the delivery mission is its function. The second paragraph is called the tightening section, and the volume of the groove is gradually smaller and the temperature reaches the degree of plasticization of the material. The tightening here is caused by the transport section III, where it is tightened to one, which is called the tightening ratio of the screw (3: 1), and some machines have changed, the finished plasticized material into the third paragraph. The third paragraph is the measurement section, where the material adhere to the plasticization temperature, just as metering pumps as accurate and quantitative delivery of melt materials to supply the nose, at the moment the temperature can not be lower than the plasticization temperature, generally slightly higher.