Drying Device for Powdered Building Material
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Solution Overview
Problem
Powdered building materials used in three-dimensional component production are prone to increased oxidation and brittleness due to moisture absorption, leading to changes in flow behavior and reduced process quality when exposed to the atmosphere during handling and processing in stations like building, unpacking, and sieve stations.
Innovation Solution
A drying device with a moisture-permeable membrane and a drying agent, such as silica gel, that absorbs moisture from the powdered building material, reducing its moisture content and preventing oxidation, connected to storage containers and funnels in the production installation to maintain a low moisture environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If powdered building material is exposed to the atmosphere during handling and processing, then the material can be transported and processed through various stations, but moisture absorption occurs leading to increased oxidation and brittleness
Solution Approach 1:
The patent applies an inert atmosphere principle by introducing a drying device that creates a moisture-free environment within the storage funnel using drying agents (such as silica gel or molecular sieves). This inert environment prevents moisture absorption from the atmosphere, thereby maintaining material quality stability while allowing continuous material throughput through various processing stations.
Solution Approach 2:
The drying device acts as an intermediary between the atmospheric environment and the powdered building material. By placing drying agents in contact with the material through a permeable membrane, the device mediates moisture removal without direct contact between the material and the drying agents, thus maintaining material quality while enabling continuous processing.
2Reliability
If a drying device is integrated into the storage funnel, then moisture content is reduced and oxidation is prevented, but the device complexity increases
Solution Approach 1:
The patent employs a flexible thin film (permeable membrane) to separate the drying agents from the powdered building material while allowing moisture vapor to pass through. This thin film solution achieves moisture removal functionality without requiring complex mechanical structures, thus maintaining system simplicity while improving material quality stability.
Solution Approach 2:
The drying device operates autonomously using passive drying agents that automatically absorb moisture from the atmosphere and from the material surface without requiring external power sources or complex control systems. This self-service approach reduces device complexity while effectively preventing oxidation and maintaining material quality.
3Reliability
If drying agents are placed in direct contact with the powdered building material, then moisture absorption is maximized, but the flow behavior of the material is altered
Solution Approach 1:
The permeable membrane serves as an intermediary between the drying agents and the powdered building material. It allows moisture vapor to pass through to the drying agents while preventing direct contact between the material particles and the drying agent grains, thus maintaining optimal material flow behavior while achieving effective moisture removal through the membrane interface.
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 effectively reduces the moisture content of powdered building materials, enhancing the quality of three-dimensional components by minimizing brittleness and improving process stability by preventing moisture-related issues in the production process.
Implementation Method 1
a membrane (152) which covers the through-opening (154) and can be positioned at the connection portion (151) of the connection flange (146)
Implementation Method 2
by means of which drying agent (164) stored in the container (141) is held separate or remote from the membrane (152)
Data Source
AI summary
A drying device for a powdered building material, in particular for a building station, unpacking station and/or sieve station which can be combined to form an installation for producing three-dimensional components by layer-by-layer solidification by means of a beam acting on the powdered building material, having a container which has a container base and, opposite the container base, a container opening, having a connection flange which has a fastening portion for releasably receiving the container opening of the container, having a connection portion which is located opposite the fastening portion of the connection flange and has a through-opening, having a membrane which closes the through-opening and can be connected to the connection portion, having a retaining element arranged in the container, by means of which retaining element drying agent stored in the container is held separate or remote from the membrane, and a drying space which receives the drying agent and a free space arranged between the retaining element and the membrane is formed.