Waste Plastic Drying Shredder with Pressing Unit and Conical Sieve
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Solution Overview
Problem
Existing machines for processing waste plastics, such as drying and shredding machines, face inefficiencies in effectively drying and shredding large-sized washed waste film, particularly in achieving simultaneous volume reduction and water removal during the processing of fluff materials.
Innovation Solution
A sequential three-unit machine comprising a pressing unit, a conical sieve, and a shredder with a face cutter powered by an electric motor, where the chute outlet is positioned before the piston dead centre, allowing for efficient compression, dewatering, and shredding of waste film, which is then further processed to remove residual water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional drying and shredding machine processes large-sized washed waste film, then the film can be shredded, but the drying efficiency is insufficient and water removal is ineffective
Solution Approach 1:
The machine is divided into three distinct functional units arranged in sequence: a pressing unit with piston and chute, a conical sieve unit, and a shredder unit. This segmentation allows each unit to perform its specific function (compression, filtration, and size reduction) efficiently, with the pressed film moving sequentially through each stage for progressive water removal and processing
Solution Approach 2:
The pressing unit performs preliminary compression and water removal before the film enters the shredder. By positioning the chute outlet before the piston dead centre and using the conical sieve, the system pre-dewateres the film, making the subsequent shredding and final drying more effective. This preliminary action reduces the water content that the shredder must handle
2Quantity of substance
If the waste film is compressed and dewatered before shredding, then water removal is improved, but the machine complexity increases
Solution Approach 1:
The patent combines multiple functions into an integrated sequential system where the pressing unit, conical sieve, and shredder work together in a compact arrangement. The conical sieve serves both as a structural component and a dewatering element, while the pressed film is directly fed into the shredder through the chute, eliminating the need for separate handling stages and reducing overall system complexity despite the multiple functions performed
3Productivity
If the chute outlet is positioned before the piston dead centre, then the compression efficiency is improved, but the device design becomes more specific and complex
Solution Approach 1:
The chute is specifically positioned at a precise location before the piston dead centre, creating an optimized local compression zone. This specific positioning allows the film to be compressed at the optimal point in the piston cycle, maximizing water extraction efficiency. The conical sieve is also specifically shaped with its narrow end at the outlet to concentrate and channel the pressed film effectively
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The machine effectively dries and shreds waste plastics by compressing and heating the film, utilizing a conical face cutter to tear the plastic into shreds, resulting in efficient water removal and volume reduction, enhancing the processing efficiency of waste plastics.
Implementation Method 1
The compressed sheets of film, slightly heated due to higher pressure
Implementation Method 2
a sieve shaped like a truncated cone narrowing towards the outlet is attached to the end of the cylinder
Implementation Method 3
the compressed sheets of film, slightly heated due to higher pressure, pass to the shredder where they are tom by the teeth on the disk of the cutter
Implementation Method 4
As a result of that, the plastic film heats up and tears apart
Data Source
Figure 1~2
Figure 3
AI summary
The waste plastics drying and shredding machine consists of the pressing unit connected to the conical sieve (4), at the end of which is the shredder (15) equipped with a facecutter(6) powered by an electric motor.