Multi-blank multi-layer co-extruding blow moulding machine

Abstract

A multi-blank multi-layer co-extruding blow moulding machine comprises a plasticizing system, a mold head extruding system and a blow moulding system. The mold head extruding system comprises more than one mold head, each mold head is provided with a feeding port connected with a screw rod; the mold head comprises a mold head main body connected with a mouth mold which is provided with a core mold; the core mold and mouth mold form an extruding port, wherein a guide body A and a guide body C are mounted in the mouth mold main body; the guide body A is provided with a step; a small head under the step is sleeved in a middle hole C of the guide body C; the small head is provided with a guide groove A and a vertical flow passage A; a big head is provided with a transverse flow passage A; a guide body B is arranged in the guide body A; the guide body B is provided with a guide flow passage B and a vertical flow passage B; the guide flow groove B is communicated with the feeding port; the guide body C is provided with the transverse flow passage C; the transverse flow passage C is connected with the guide flow groove A and the feeding port B; the guide body C is provided with a guide flow groove C and a vertical flow passage C, the guide flow groove C is communicated with the feeding port C; the vertical flow passage A, the vertical flow passage B and the vertical flow passage C are jointed at the external wall of core mold and communicated with the extruding port.

Description

Technical field [0001] The invention relates to an extrusion blow molding machine for plastic hollow containers, in particular to a multi-parison multilayer co-extrusion blow molding machine, and belongs to the field of plastic machinery. Background technique [0002] Extrusion blow hollow plastic molding machine is the main equipment for molding hollow containers (such as mineral water bottles, beverage bottles, medicine bottles, cosmetic bottles, etc.), including plasticization system, die extrusion system and blow molding system, the plasticization system Including a barrel, the barrel is connected with a screw; the die extrusion system includes more than one die, each die is made with a feed port connected to more than one screw, the die includes a die main body, a die main body The lower end is connected to the die, and the center of the die is provided with a core die. The gap between the core die and the die forms an annular extrusion port; the blow molding system includes...

AI Technical Summary

Problems solved by technology

However, the existing extrusion blow molding machines have the following defects: First, in order to increase the strength, chemical resistance and barrier resistance of the product, it is usually made of two or three layers of different plastic materials, that is, two or three screws Extrude different molten plastics separately, two or three kinds of molten plastics enter the die, and extrude one layer after another. However, the existing three-layer extrusion blow molding machine is a single die, and only one can be extruded at a time. , the work efficiency is low; second, the existing extrusion blow molding machine is a single station, that is, there is only one blow molding system, and its production efficiency is low; third, since the extrusion blow molding machine is a one-step molding machine, when the dough passes through After the die is extruded, it is directly put into the mold, and its temperature is very high. After being blown by the blowing mechanism, a large number of flashes are prone to appear. The existing technology usually undergoes manual trimming to ensure the quality and appearance of the product. However, the workload is heavy and the labor intensity is high, especially for extrusion blow machines with multiple stations (corresponding to multiple mold opening and closing mechanisms), one station requires one trimmer, which consumes a lot of manpower and high labor costs; Fourth, since the extrusion molding machine works continuously, the blowing needle in the blowing mechanism frequently contacts the freshly extruded dough, causing the blowing needle and the blowing core to always be in a high temperature state, and the working performance is affected, thus Directly affect blowing quality

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