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Threaded element meshing block element
1) The screw thread sleeve of the standard screw thread sleeve has a pitch of approximately Used in the feeding section and exhaust section of the extruder, narrow pitch elements (i.e. small lead thread elements) are mainly used in parts where the material needs to be compressed or filled with a large amount of filler, upstream of the upstream meshing block or sealing ring or between the operating sections. (For example, between feeding and vacuum) The thread pitch of the thread sleeve can be increased. As the pitch increases, the residence time and filling degree will be reduced, the residence time will be narrowed, the drag flow will increase, and it will be more sensitive to the increase in pressure ( The possibility of leakage or reverse flow increases due to increased pressure. Under normal pressure conditions (or when the upstream delivery pressure and downstream obstruction pressure are balanced), the conveying capacity of a wide-pitch thread is still greater than that of a narrow-pitch thread. .
In addition to the threaded sleeves used to convey screws, several conveying elements are also designed for special situations. For example, threaded sleeves to cope with feeding difficulties and conveying low-density materials are used to prevent leakage.< br/> 2) Screw meshing block. The thread sleeves on the screw are composed of continuous threads. The meshing block has elements with side disks that are stacked one by one. The geometric shape is a characteristic parameter of the discontinuous meshing block. It includes the total length, the number of meshing disks, and the staggered angle of the meshing disks. We usually use the expression meshing disk, and add a specific numerical value after it to indicate the actual shape of the meshing disk. For example, the staggered angle of the meshing disks is degrees, and there are 1 meshing disk in total. , the length of the meshing block is. The main tasks of the meshing block are dispersion mixing and distribution mixing.

3) Dispersion mixing Dispersion mixing is to reduce the particle size of the components and make the solid blocks or aggregates The polymer is broken into particles, or the phase size of mutually incompatible polymers is reduced to the required range. This process is usually achieved by relying on a kneading disc with a large meshing length and a medium lead.
4) Distribution mixing Distribution mixing is to achieve uniform spatial distribution of components, that is, to ensure uniform distribution of components in the melt passing through the distribution element in the mixing equipment. This is usually achieved by kneading the disc with a narrow blade and a small angle. In extreme cases, special distribution components are first used. Different materials have different requirements for the mixing capacity of the screw, and the requirements for reinforced and filled types are completely different. Even for the same type of processing, such as engineering plastic alloys, the requirements for /alloys are different from those for /.