Process and device for processing granular material mixtures

Abstract

The present invention relates to a metering process of a number of granular materials comprising the steps of: a) initial calibration of a multiple metering device (DM) including the steps of: loading a number of granular materials to be metered into respective hoppers or silos, each equipped with a respective extractor device making up part of the multiple metering device (DM); separately driving each of the extractor devices , each associated with a respective hopper, whereby carrying out a pre-established number of opening-closing steps in the time unit thereby obtaining a corresponding amount of extracted granular material; weighing the amount of granular material extracted by each extractor device; inserting weight data for each granular material to be metered into a program control unit (CPU) for the calculation of the opening-closing period of each extractor device based on desired percentages of each granular material to be metered, for the obtainment of a final mixture with desired composition; and subsequently b) cyclic execution of the following sequential steps: sending control signals processed by the program control unit (CPU) as a function of said periods of extractor opening-closing for the extraction of an metered amount of the respective granular material to be treated by at least two extractor devices; collecting, in a holding container (CP), the metered amounts of each granular material thus extracted; and detecting, by means of sensor means (MS), a pre-established filling threshold of the holding container (CP) thereby stopping the at least two extractor devices upon attainment of the pre-established filling threshold.

Description

technical field [0001] The present invention relates to an apparatus and method for treating mixtures of various particulate materials, especially plastic particles. Background technique [0002] When plastic materials are cut or ground into pellets or flakes of the desired particle size or size prior to conversion or recycling, additional pellets or powders, usually fine powders or plastic pellets (grinding) are added At the same time, if necessary, a small or very small amount of one or more additives, which are usually coloring powders, lubricants, etc., will be added, which is well known to those skilled in the art of plastic conversion. The metering equipment or metering devices for granular materials are both volumetric and gravity, and the metering accuracy available on the market is not satisfactory. [0003] Volumetric metering devices generally consist of a chamber for the pellets to be metered and a motorized auger for dispensing or extracting the pellets from sa...

AI Technical Summary

Problems solved by technology

In other words, materials with a higher specific gravity will separate from other ingredients in the mixture, thereby making the mixture inhomogeneous, thereby destroying the physical and chemical properties of the final product molded by the converting machine

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