How to install the manifold and filter on the plastic blow molding machine?
Placement of manifolds and filters Manifolds come in various forms. Currently, the flat-plate manifolds that are simple in structure and easy to manufacture are commonly used. In order to make the flow rate of materials through the splitter plate uniform, the distribution of holes is often sparse in the middle and dense at the edges. The sizes of the holes are usually equal, and their diameters are generally 2~7mm and increase with the increase of the screw diameter. The layout is mostly arranged in concentric circles, and some are arranged in hexagonal shapes. The total area of the holes is about 30% to 70% of the effective area of the manifold. The thickness of the manifold is determined by the size of the extruder and the amount of pressure it can withstand. , generally 20%~30% of the barrel inner diameter. In order to facilitate the flow of materials and the cleaning of the manifold, the tunnel should be smooth and without dead corners, and a bevel should be provided at the feed end of the tunnel. The manifold plate is mostly made of stainless steel. When placing the manifold plate, the distance from the manifold plate to the screw head should not be too large, otherwise it is easy to accumulate materials and cause heat-sensitive plastics to decompose.
However, it should not be too small, otherwise the material flow will be unstable and the quality of the product will be affected. unfavorable. Usually, the volume between the screw head and the diverter plate is less than or equal to the volume of one screw groove in the homogenization section, and the distance is about 0.1D (D is the diameter of the screw). Filters are usually used in situations where product quality is high or high plasticizing pressure is required, such as transparent hollow products, hollow products with high apparent quality requirements, etc., and for extruding UPVC and other materials with high viscosity and poor thermal stability. Generally, no filter or even a manifold is used. The fineness and number of layers of the filter mesh depend on the properties of the material, the form of the extruder, the shape and requirements of the product, etc. The fineness of the mesh is 20 to 120 mesh, and the number of layers is 1 to 5. If a multi-layer filter is used, the fine one can be placed in the middle and the coarse ones on both sides. If there are only two layers, the thick one should be placed against the manifold, so that the fine one can be supported to prevent it from being broken by the material flow. In order to ensure To ensure the quality of the product, the filter should be replaced regularly.
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