In recent years, Single screw extruder being based on the so-called barrier screw concept have gained acceptance to an increasing extent. In a so-called barrier screw, the screw channel is divided in a solid matter channel and a melt channel by way of a further side bar. Compared with the primary side bar, being known from conventional screws, the smaller formed barrier side bar allows a transverse flow of melt from the solid matter channel into the melt channel. The cross-section of the melt channel increases in a downstream direction whereas the cross-section of the solid matter channel continuously decreases in the downstream direction as to maintain the desired conveying effect of the screw. Due to the so-called barrier zone particularly the heat transfer from the barrel and the screw surface to the granulate not yet melted is improved.

A spray dryer equipment for spray drying a sample dissolved in an organically grown solvent is disclosed, comprising a blood circulation collection by which an inert gasoline is circulated with a blower, a heater for heating the inert gasoline to some specified temperature, a principal drying chamber supplied acquiring a spray nozzle by means of which the sample dissolved through the organically grown solvent is sprayed in to the inert gas, a collector by which the powdered sample made through the principal drying chamber is collected, jointly with a condenser by which the gaseous organically grown solvent is condensed and recovered. The powdered sample is obtained on this spray dryer equipment for spray drying organically grown solvents by spraying the organically grown solvent by means of the spray nozzle in to the principal drying chamber by which the oxygen concentration is held to some minimal worth in the intro belonging for the inert gas.

The spray dryer equipment for spray drying the sample dissolved through the organically grown solvents is developed to acquire illustrations in powder type by spraying a sample dissolved in an organically grown solvent by means of a nozzle in to a drying chamber.

From a 1st aspect, the present creation provides an extruder products comprising: an extrusion die; a feed passage disposed at the rear of the die and guiding a raw materials thereinto; and even more comprising characteristically on the very least just one pair of blades which every carries a helical borders created at a predetermined direct angle and protruding to the feed passage from an inside periphery thereof, wherein the blades are driven to rotate so concerning force the raw materials in the direction of the die.

From a next aspect, the present creation provides an extruder comprising: an extrusion die; a feed passage disposed at the rear of the die and guiding a raw materials thereinto; and even more comprising characteristically a stationary key disposed in an intermediate area belonging in the direction of the feed passage so concerning define on the very least just one annular passageways near to the key and in fluid discussion using the feed passage; and on the very least just one pair of blades which every possess a helical borders created at a predetermined direct angle and disposed inside the annular passageway, wherein the blades are driven to rotate so concerning force the raw materials in the direction of the die.

In a Single screw extruder, the screw typically has an external diameter corresponding to outer edges of the helical threads or flights. The flights may be under sized in relation to the barrel in the feed or hopper area so as to reduce feedthroat friction. Typically, a single keyway in the shaft area of the screw matches a keyway in a sleeve portion of a drive shaft so that a key positioned in the matching keyways is utilized to transmit rotational movement from the drive shaft to the screw. The key is a separate piece of rectangular metal which fits into the matching keyways. A disadvantage attendant with the use of keys is that they may be lost or misplaced. Also, worn keys can contribute to screw wobble.

As the viscosity of the thermoplastic material increases, it has been observed, that in single screws of the above described type, radial screw movement or wobble may develop. Clearance in the feed area between the outside diameter of the screw and the inside of the barrel permits movement of screw. As the screw wears, metal may be removed between the exterior of the screw and the inside of the barrel. This creates additional clearance which may cause even more wobble or radial movement.