Polycrystalline Silicon Packaging with Energy Absorber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for packaging polycrystalline silicon face issues with sticking and piercing of plastic bags, leading to increased stoppage times and contamination, particularly due to the sharp-edged, non-flowable nature of the material.
Innovation Solution
The method involves using a freely suspended energy absorber or storage container with at least two openings to guide the silicon into a plastic bag, either by lowering the bag during filling or rotating the container, ensuring the silicon slides into the bag without sticking or piercing, and utilizing a weighing balance and shaking mechanism to control the product flow and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a freely suspended energy absorber is used to prevent piercing of plastic bags, then piercing is avoided, but silicon chunks stick in the energy absorber causing increased stoppage times
Solution Approach 1:
The energy absorber is designed to be freely suspended rather than fixed, allowing it to move dynamically during the filling process. This movement prevents silicon chunks from sticking while still providing protection against piercing, as the energy absorber can adjust its position to accommodate the flowing material without creating static contact points where sticking occurs
Solution Approach 2:
The energy absorber's physical parameters such as material composition, shape, and surface properties are optimized to balance two functions: providing sufficient cushioning to prevent bag piercing while maintaining low friction surfaces that prevent silicon sticking. The parameters are tuned so the energy absorber remains mobile and non-adhesive to the silicon chunks
2Ease of manufacture
If conventional plastic bags are used for packaging, then packaging simplicity is maintained, but sharp-edged silicon chunks pierce the bags causing contamination
Solution Approach 1:
The energy absorber serves as an intermediary element between the sharp-edged silicon chunks and the plastic bag. It absorbs the impact energy and prevents direct contact between the silicon edges and the bag material, thereby protecting the bag from piercing while maintaining the simplicity of using conventional plastic bags for packaging
Solution Approach 2:
The energy absorber is positioned in advance within or near the filling path to provide cushioning before the silicon chunks can pierce the bag. This pre-positioned protection allows the use of thinner, simpler plastic bags since the piercing risk is mitigated beforehand by the energy-absorbing element
3Manufacturing precision
If polysilicon is packaged with minimal contamination, then material purity is improved, but handling and filling become more difficult due to sharp edges and non-flowable properties
Solution Approach 1:
The filling process replaces aggressive mechanical handling that causes contamination with a gentler system using gravity-fed flow through the freely suspended energy absorber. This substitution allows the sharp-edged, non-flowable polysilicon to be filled with minimal mechanical stress, maintaining material purity while simplifying the handling requirements
Solution Approach 2:
The energy absorber creates a protected filling environment that prevents external contamination of the sensitive polysilicon material. By controlling the filling path and using non-reactive, low-contamination materials for the energy absorber, the system maintains an inert filling atmosphere that preserves material purity despite the complex handling requirements
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
This approach effectively prevents sticking and piercing of the plastic bags, reducing machine stoppages and contamination, allowing for efficient packaging of polycrystalline silicon chunks up to 10 kg with minimal further comminution, suitable for both solar and electronics industries.
Implementation Method 1
a freely suspended energy absorber consisting of a nonmetallic low-contamination material, which is introduced into the plastic bag before filling with the polycrystalline silicon and through which the plastic bag is filled with the polycrystalline silicon
Implementation Method 2
the plastic bag is lowered downward during the filling, so that the silicon slides into the plastic bag
Data Source
AI summary
A method is disclosed for packaging polycrystalline silicon, in which a plastic bag is filled with polycrystalline silicon by means of a filling device, which has a freely suspended energy absorber consisting of a nonmetallic low-contamination material, wherein the plastic bag is pulled over the energy absorber and filled with polycrystalline silicon, and the plastic bag is lowered downward during the filling, so that the silicon slides into the plastic bag. Also disclosed is a method for packaging polycrystalline silicon, in which a plastic bag is filled with polycrystalline silicon by means of a filling device, wherein a storage container has an opening through which it is filled with silicon, the plastic bag being pulled over the storage container after filling the storage container with silicon and the storage container subsequently being rotated so that the silicon slides out of the storage container into the plastic bag.