Polysilicon Dosing and Packaging with Hard Metal Screens
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for packaging polysilicon chunks are inadequate in achieving high accuracy and low contamination, as they often result in mechanical instability and increased contamination due to the use of silicon or plastic claddings, and manual correction is necessary to meet the required weigh-in tolerances, especially for chunks of 50-130 mm.
Innovation Solution
A method and device that utilize hard metal elements for the screen and dosing balance, along with a wear-resistant coating for the shaper, to separate polysilicon chunks into coarse and fine sizes for precise dosing and packaging, ensuring mechanical stability and reducing contamination, with a dosing unit and packaging unit that include a feed channel, screens, and a packaging system for forming and sealing plastic bags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If silicon or plastic claddings are used to protect components contacting polysilicon, then contamination is reduced, but mechanical stability decreases and maintenance intensity increases due to wear
Solution Approach 1:
The patent removes the silicon or plastic claddings from components that contact polysilicon during dosing and packaging operations. By eliminating these cladding layers, the system achieves better mechanical stability and reduced maintenance while maintaining contamination control through alternative means such as controlled environments and material selection.
Solution Approach 2:
The patent applies different material properties to different components based on their specific functions. Instead of universally cladding all contact surfaces, the system selectively uses materials that provide contamination protection only where necessary, while maintaining mechanical integrity in areas requiring structural strength.
2Measurement precision
If manual correction is used to meet weigh-in tolerances, then dosing accuracy improves, but productivity decreases
Solution Approach 1:
The patent implements a feedback-controlled dosing system that continuously monitors the weight of polysilicon being dosed and automatically adjusts the dosing parameters to maintain accuracy within ±100g tolerances. This closed-loop control eliminates the need for manual correction while maintaining high dosing precision, thereby preserving productivity.
Solution Approach 2:
The patent replaces manual correction operations with an automated electronic control system that uses sensors, controllers, and actuators to achieve precise dosing. This substitution of mechanical/manual processes with automated systems maintains accuracy while significantly improving packaging speed and productivity.
3Quantity of substance
If chunks of 50-130 mm are processed, then product specifications are met, but dosing accuracy deteriorates beyond ±100g tolerance
Solution Approach 1:
The patent segments the dosing process into multiple stages, including pre-sorting of chunks by size, controlled feeding mechanisms that account for chunk size variations, and multi-point weighing systems. This segmentation allows the system to handle 50-130 mm chunks effectively while maintaining dosing accuracy within ±100g tolerances.
Solution Approach 2:
The patent dynamically adjusts dosing parameters such as feed rate, weighing sensitivity, and dispensing speed based on the detected chunk size. By changing these parameters in real-time according to the specific chunk dimensions (50-130 mm), the system maintains accurate dosing despite variations in chunk size.
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 solution enables accurate dosing and packaging of polysilicon chunks with an accuracy of ±90 g, reduces maintenance needs, and prevents contamination, allowing for secure handling and transport while meeting the purity requirements of the semiconductor and solar industries.
Implementation Method 1
separated by means of at least one screen into coarse and fine chunks
Implementation Method 2
weighed and dosed to a target weight by means of a dosing balance
Implementation Method 3
the at least one screen and the dosing balance at least partially comprise a hard metal on their surfaces
Implementation Method 4
the shaper for forming the plastic bag comprises a wear-resistant coating
Data Source
AI summary
Disclosed is a method for dosing and packaging polysilicon chunks, wherein a product flow of polysilicon chunks is transported via a feed channel, separated by at least one screen into coarse and fine chunks, weighed and dosed to a target weight by a dosing balance, discharged via a discharge channel and transported to a packaging unit where a first plastic bag is filled with the polysilicon chunks and sealed, the plastic bag containing polysilicon chunks being packaged with a further plastic bag which is formed by a shaper and subsequently welded, wherein the at least one screen and the dosing balance at least partially include a hard metal on their surfaces and the shaper for forming the plastic bag includes a wear-resistant coating. Also disclosed are a dosing unit, a packaging unit and a device for dosing and packaging polysilicon chunks, which contains a dosing unit and a packaging unit.