Large-section foamed plastic product extruding machine head

Abstract

The invention discloses a large-section foamed plastic product extruding machine head, which comprises a machine head and a guide sleeve. The large-section foamed plastic product extruding machine head is characterized in that a setting sleeve is arranged at the rear end of the machine head; a plurality of choke flow devices are arranged on the rear part of the guide sleeve; the front end of each choke flow device is fastened on the rear part of the guide sleeve; the sectional area of all choke flow devices occupies 20%-45% of the sectional area enclosed by the inner surface of the setting sleeve; molten plastic is always kept at enough machine head pressure before completely penetrating through the choke flow devices; and a material foams to fully fill an internal space of an inner filling layer, so as to meet the requirements of a foaming process. According to the large-section foamed plastic product extruding machine head, the problem that the pressure provided by virtue of an extrusion screw rod is not enough in a conventional plastic extruding machine head is solved; a large-section plastic product is produced; a composite extrusion foaming process is realized; the external surface layer of the product is uniform in thickness; the inner filling layer is even to foam; the elastic modulus required by the product and the maximal bending stress are reached; and meanwhile, the problem that the inside of the large-section plastic product is relatively difficult to rapidly cool and set is also solved.

Description

technical field [0001] The invention belongs to a foamed plastic product manufacturing equipment, in particular to a large-section foamed plastic product extruder head. Background technique [0002] The head of the plastic extruder is a key part of the product forming in the plastic processing, which is used to meet the product forming in the plastic extrusion process. Moreover, usually in the field of plastic products, the cross-sectional area perpendicular to the extrusion direction exceeds 10000mm 2 Products can be called large cross-section plastic products. Especially for large cross-section plastic products with a number of reinforcing rods inside, the outer skin layer is a non-foaming smooth entity, and the inner filling layer is a foamed structure, the continuous and stable production process of reinforced and compound extrusion large cross-section plastic products, the traditional plastic extruder The structure of the head does not have this ability. At present, t...

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Problems solved by technology

Especially for large cross-section plastic products with a number of reinforcing rods inside, the outer skin layer is a non-foaming smooth entity, and the inner filling layer is a foamed structure, the continuous and stable production process of reinforced and compound extrusion large cross-section plastic products, the traditional plastic extruder The structure of the head does not have this ability. At present, there is no extrusion head for processing large-section plastic products. The main reason is that the internal molten plastic cannot be cooled in time, which leads to the shrinkage of the product and the unstable shape of the product; and simply relying on extrusion The head pressure provided by the screw cannot reach the head pressure required by the process and cannot meet the specified technical requirements

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