Discarded high foaming plastics regeneration pelleting process

Abstract

The invention relates to a technological field of high molecular polymer recycling and granulation process, particularly the regeneration and granulation process of discarded high plastic foam. The process consists of impurity removal, artificial feeding, automatic grinding, automatic forced in-material, large screw and screw channel in-material, large screw variable distance first stage compression and exhaust, variable screw diameter second stage heating and compression, heating melting third stage variable screw bottom diameter compression, water vapor and residual gas elimination, fuses mass fourth compression, non stop screen changing and filtering, stripy extrusion, cooling setting, granulating and human metering package; the process has simple operation, convenience for scale, specialization of product, can greatly improve working and producing surroundings and operational safety, forms recycle market and promote environmental protection.

Description

technical field [0001] The invention relates to the technical field of high-molecular polymer recycling technology, in particular to the regeneration and granulation technology of waste high-foaming plastics. Background technique [0002] Plastic products are indispensable products in people's daily life, such as plastic bags, EPE foam products, beverage bottles, mobile phone casings, etc., which are widely used and used in huge quantities. In order to meet the needs of daily necessities and industrial products, the output of plastic products It is also increasing day by day, and discarded plastic products are difficult to degrade, and are discarded in every corner of life, polluting the environment, which is called "white pollution". At first, in order to solve this problem, people used incineration to solve this problem, and burned waste plastics, but the burning of plastics produced a large amount of dioxin (Dioxin), causing secondary pollution. Since then, in order to av...

AI Technical Summary

Problems solved by technology

[0017] (1) The labor intensity is high. After the high-foaming waste is crushed, the volume will further increase. After crushing, it needs to be manually transported to the hopper of the granulation equipment. Due to the large volume and low density, the transport efficiency is low, the transport frequency is high, and the labor intensity is high.

[0018] (2) Air pollution, poor working environment, high foaming. During the crushing process and the screw forced feeding of the granulator, a large amount of cotton-like dust is produced, which floats in the air and is difficult to disappear. It pollutes the air environment and is a serious threat to the health of production workers. , prone to incurable occupational diseases

[0019] (3) The feed port of the granulator must be screwed in, or manually squeezed with a wooden stick, before feeding, otherwise, the high-foaming fragments with low density will form an "arch bridge" feeding failure, which cannot be continued Feeding materials, there are major safety hazards, and industrial accidents are prone to occur

[0021] (5) Due to the small number of discharge holes in the die head of the granulator and insufficient feeding, the molten plastic stays in the screw for too long, and the plastic in the screw groove is repeatedly sheared and stirred by the screw in a high-temperature molten state, which is easy to cause plastic decomposition. , discoloration, denaturation, easy to form pores, non-dense particles, the product is difficult to meet the requirements of reuse

[0022] (6) High energy consumption, low efficiency and high production cost

Even with a large screw of φ150, the output per hour can reach more than 200 kg when producing EPE waste plastic bag granulation, but when used for EPE high-foaming plastic granulation, it is difficult to feed loose waste materials and the screw inlet is difficult to enter. A large number of vacant screw melt tanks have a small amount of extrusion, and the output per hour is less than 60 kg. If the φ120 screw is used, the output is lower and basically has no market value. Due to the high production cost and no advantage in price compared with new raw materials, it is difficult to Form a recycling market

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