Method for promoting plastic additive distributing precision and device thereof

Abstract

The present invention relates to a method and a device for improving the plastic additive proportion precision; constant volume gages are taken as the chief gage for proportioning mixture material and volumetric meters are taken as the metering gage of additive; the side wall of the volumetric meter is equipped with an additive special feeding port which is equipped with the volumetric gage and the side wall of the mixer is equipped with a return feeding port which is equipped with the constant volume gage; additives participating in proportioning are delivered to the chief gage after being measured by the volumetric gage and then the chief gage is filled with the main material; the reclaimed materials which do not participate in proportioning is directly delivered to the mixer cavity to mix with the main materials containing additives; materials are put into use after the materials are evenly mixed. The part near top and bottom of every constant volume gage is designed of the inclined structure which is convenient for filling and discharging and the present invention can ensure the accurate addition and repeated proportioning each time; the present invention boasts of high-precision proportion and even mixing which is beneficial to ensuring the quality of processed products and promoting the product qualification rate and total productivity.

Description

technical field [0001] The invention relates to the technical field of plastic processing, in particular to a method and a device for improving the proportioning accuracy of plastic additives (including color masterbatch). Background technique [0002] At present, in the processing and manufacturing of plastic products, it is a daily task to mix and match various granular raw materials before using them. Usually, when adding one or several additives and auxiliary materials to a certain main material, it is necessary to use a metering device. Volumetric metering devices are widely used because of their cheap price and practicality. Currently, volumetric meters are mostly used in the following two working modes: [0003] The first type) is to install the volumetric meter directly on the material inlet of the plastic processing equipment (such as injection molding machine, extruder, etc.), and usually the recycled material (crushed material after crushing the product or leftov...

AI Technical Summary

Problems solved by technology

Since the volumetric meter needs to communicate with the injection molding machine to work, the rotation of the volumetric metering screw is started and stopped at the same time as the rotation of the screw of the injection molding machine during metering. The transition stage of deceleration makes the measurement in the acceleration and deceleration stage especially inaccurate. At the same time, because the measurement accuracy of the volumetric meter itself is not high, and there is no mixing facility, not only the proportioning accuracy is low, but also the mixed raw materials are clearly separated. , the ingredients are directly put into application without fully uniform mixing, and the products are processed one by one, which will inevitably affect the actual proportion of each component in the product to a certain extent, thereby affecting the stability of product quality

[0004] The second) is to add a mixer (or mixer) between the bottom of the volumetric meter and the material inlet of the processing equipment. First, the recycled material is added to the main material according to the rated amount through the proportional valve, and then the The color masterbatch or other additives are added to the main material channel after being measured by the volumetric meter according to the rated amount, and at the same time they fall into the mixer cavity to be stirred and mixed before being used by the processing equipment. However, due to the use of proportional valves to add recycled materials, the raw materials and recycled materials enter the mixer in batches, and because the working mode of instant stirring and direct feeding is adopted, there is still the problem of uneven mixing. It is very easy to have inconsistent proportions of recycled materials in each product, especially in precision injection molding, which often results in a product that is mainly composed of new materials, while a product is mainly composed of recycled materials. As a result, the physical properties of the products vary greatly, making it difficult to guarantee product quality.

[0005] In short, the batching method currently used in plastic manufacturing is not very reasonable, the uniformity of the mixed batching is poor, and the ratio accuracy is very low, so it cannot meet the increasing product quality requirements of plastic products.

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