|
QINGDAO JBD MACHINERY CO., LTD
|
Blog
An Single screw extruder for use in digesting polymeric substance is ordinarily composed of, Twin Screw Extruder a cylinder owning one or additional raised ridges (a "flight") helically disposed thereabout, which offers pump rotates within an annular cylinder, or barrel. The surface area inside the above which the flight(s) are raised could be the root of the.sheet producing extruder.A hopper directs polymeric substance by means of an opening from the barrel into make contact with with and in to the space in between the flight(s) as well as the internal wall inside the barrel inside the extruder.
The gravimetric feeder ordinarily has an first or feed part which starts the treatment of conveying the reliable polymeric substance forward inside the barrel of the, the path of trip inside the polymeric substance since it is transported apart away from your hopper by getting deemed the "downstream" direction. The feed part of is ordinarily followed, with or not owning other intervening sections, with a changeover or melting part by which plastication inside the polymeric substance occurs. Plastication inside the polymeric substance requires place getting a final result inside the blended effect of heat founded by heater bands mounted concerning the outside of barrel as well as the shearing forces to which the subjects the polymeric substance major to friction in between the inside wall of barrel as well as the polymeric material. The melting part of ordinarily followed, once more with or not owning other intervening sections, with a metering part which features to pump the plasticated material, out by means of the downstream finish off of which could be ordinarily a die or some other type of limited orifice.
Polymeric components owning numerous bulk densities behave in different ways from the melting, or plastication, part of pecifically merely because inside the numerous bulk densities. When polymeric substance is plasticated, the plastication mechanism entails compacting the substance to acquire frictional make contact with inside the substance using the internal wall inside the barrel. components of higher bulk density cannot be compacted as quickly or readily as people of decrease bulk density, and problems that are best suited using the compaction of one substance are ordinarily not best suited for an additional substance or for just about any mixture that contains that other material. the quantity of big difference from the bulk densities of two components which may possibly trigger numerous compaction conduct is ordinarily on the very very least twenty % (determined as (ρ one -ρ two )/100/ρ two , precisely where ρ one is higher than ρ two ) may possibly be on the very very least fifty percent, is ordinarily on the very very least 100 percent, and may possibly on event be on the very very least 1000 percent. A earliest movement toward developing plastication problems best suited for polymeric components owning numerous bulk densities can be to classify people components according in the direction of the effect of bulk density on compaction conduct solitary Single screw extruder.
The gravimetric feeder ordinarily has an first or feed part which starts the treatment of conveying the reliable polymeric substance forward inside the barrel of the, the path of trip inside the polymeric substance since it is transported apart away from your hopper by getting deemed the "downstream" direction. The feed part of is ordinarily followed, with or not owning other intervening sections, with a changeover or melting part by which plastication inside the polymeric substance occurs. Plastication inside the polymeric substance requires place getting a final result inside the blended effect of heat founded by heater bands mounted concerning the outside of barrel as well as the shearing forces to which the subjects the polymeric substance major to friction in between the inside wall of barrel as well as the polymeric material. The melting part of ordinarily followed, once more with or not owning other intervening sections, with a metering part which features to pump the plasticated material, out by means of the downstream finish off of which could be ordinarily a die or some other type of limited orifice.
Polymeric components owning numerous bulk densities behave in different ways from the melting, or plastication, part of pecifically merely because inside the numerous bulk densities. When polymeric substance is plasticated, the plastication mechanism entails compacting the substance to acquire frictional make contact with inside the substance using the internal wall inside the barrel. components of higher bulk density cannot be compacted as quickly or readily as people of decrease bulk density, and problems that are best suited using the compaction of one substance are ordinarily not best suited for an additional substance or for just about any mixture that contains that other material. the quantity of big difference from the bulk densities of two components which may possibly trigger numerous compaction conduct is ordinarily on the very very least twenty % (determined as (ρ one -ρ two )/100/ρ two , precisely where ρ one is higher than ρ two ) may possibly be on the very very least fifty percent, is ordinarily on the very very least 100 percent, and may possibly on event be on the very very least 1000 percent. A earliest movement toward developing plastication problems best suited for polymeric components owning numerous bulk densities can be to classify people components according in the direction of the effect of bulk density on compaction conduct solitary Single screw extruder.
Knowing the respective bulk densities of numerous polymeric components to develop to be plasticated with one another could allow it to be feasible to provide separate plastication ailments in every individual appropriate for just about any numerous material. this really is carried out by constructing a Twin Screw Extruder with two or much more numerous plastication sections. The plastication area of an individual Screw Extruder regularly consists of a frusto conical type using the circumference in the cone escalating within downstream direction. As polymeric materials passes by method of a plastication area of an extruder the space in between the root in the screw as well as the internal wall of items pumpthe barrel (the "channel depth") decreases, as well as the polymeric materials is compressed. The compression ratio of the plastication area of the screw is determined with a ratio in the funnel depth on the best in the frustum for that funnel depth on the bottom in the cone (base in the frustum).
This is confirmed in gravimetric feeder since the ratio of H 0 /H one .
The compression pace of the plastication area of the is determined with a romantic relationship derived by method of the greatest triangle shaped with a collection intersecting the circumference in the best in the frustum and parallel for that longitudinal axis of, the intersection of the kind of collection using the bottom in the cone (base in the frustum) as well as the root in the screw. This romantic relationship could possibly be the compression ratio divided in the total amount L/D precisely where L could possibly be the range by method of the greatest for that bottom in the cone frustum and D could possibly be the diameter in the annulus in the barrel. These components are also confirmed in FIG. 1.
It have been found that when two or much more plastication sections are made in the screw for plastication of the mixture of components getting numerous bulk densities, a adequate compression ratio for every individual this type of area may nicely be within broad variety of about 1.2 to about 5. The compression ratio for just about any area by which a materials getting a bulk density of 0.6 g/cm three or much more will be to develop to be plasticated may nicely preferably be within broad variety of about 1.2 to about 3.3, as well as the compression ratio for just about any area by which a materials getting a bulk density of much under 0.6 g/cm three will be to develop to be plasticated may nicely preferably be within broad variety of about 3.3 to about 5. A adequate compression pace for every individual this type of plastication area may nicely be within broad variety of about 0.01 to about 15, preferably about 0.05 to about 13.7. The compression pace is selected this type of that, for just about any offered temperatures and stress within of the extruder.a higher period of your time is permitted for that plastication area in the Single screw extruder for individuals components that are pretty much more challenging to plasticate merely because of, for example, a increased bulk density and/or a increased melting or softening temperature. The plastication sections sheet production extrudermay be made within screw in any purchase this type of that one area is used downstream by individual Screw Extruder, the downstream area getting a increased or reduce compression ratio and/or a increased or reduce compression pace compared to upstream section. one or much more this type of plastication sections may, but need not be, quickly adjacent.
This is confirmed in gravimetric feeder since the ratio of H 0 /H one .
The compression pace of the plastication area of the is determined with a romantic relationship derived by method of the greatest triangle shaped with a collection intersecting the circumference in the best in the frustum and parallel for that longitudinal axis of, the intersection of the kind of collection using the bottom in the cone (base in the frustum) as well as the root in the screw. This romantic relationship could possibly be the compression ratio divided in the total amount L/D precisely where L could possibly be the range by method of the greatest for that bottom in the cone frustum and D could possibly be the diameter in the annulus in the barrel. These components are also confirmed in FIG. 1.
It have been found that when two or much more plastication sections are made in the screw for plastication of the mixture of components getting numerous bulk densities, a adequate compression ratio for every individual this type of area may nicely be within broad variety of about 1.2 to about 5. The compression ratio for just about any area by which a materials getting a bulk density of 0.6 g/cm three or much more will be to develop to be plasticated may nicely preferably be within broad variety of about 1.2 to about 3.3, as well as the compression ratio for just about any area by which a materials getting a bulk density of much under 0.6 g/cm three will be to develop to be plasticated may nicely preferably be within broad variety of about 3.3 to about 5. A adequate compression pace for every individual this type of plastication area may nicely be within broad variety of about 0.01 to about 15, preferably about 0.05 to about 13.7. The compression pace is selected this type of that, for just about any offered temperatures and stress within of the extruder.a higher period of your time is permitted for that plastication area in the Single screw extruder for individuals components that are pretty much more challenging to plasticate merely because of, for example, a increased bulk density and/or a increased melting or softening temperature. The plastication sections sheet production extrudermay be made within screw in any purchase this type of that one area is used downstream by individual Screw Extruder, the downstream area getting a increased or reduce compression ratio and/or a increased or reduce compression pace compared to upstream section. one or much more this type of plastication sections may, but need not be, quickly adjacent.
