Halogen-Free White Glass Container with Phase Separation Structure
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Solution Overview
Problem
Conventional white glass production methods face issues such as air pollution, safety hazards due to fluorine gas emission, generation of cracks and foreign materials, and insufficient white coloration, particularly when using halogen-free glass compositions and automatic bottle making machines.
Innovation Solution
A white glass container with a white multilayer structure derived from a phase separation phenomenon, comprising SiO2, P2O5, Al2O3, B2O3, and R2O (R=Na or K), or SiO2, P2O5, Al2O3, B2O3, R2O (R=Na or K), MgO, and CaO, where the content of P2O5 in the white transparent layer is smaller than in the white opaque layer, ensuring stable phase separation and reduced foreign material generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluorine-containing glass composition is used to achieve milky whitening, then white coloration is improved, but air pollution and safety hazards due to fluorine gas emission occur
Solution Approach 1:
The patent extracts and removes fluorine from the glass composition entirely, replacing it with a halogen-free formulation that uses phosphorus-containing compounds and metal oxides to achieve the desired milky appearance without generating harmful fluorine gas emissions during melting or processing
Solution Approach 2:
The patent changes the chemical composition parameters by eliminating fluorine and introducing specific ratios of phosphorus pentoxide (P2O5: 3-15 wt%), metal oxides (Al2O3: 5-20 wt%, CaO: 5-20 wt%), and other components to achieve phase separation that produces the milky appearance through fine crystal formation instead of fluorine-based mechanisms
2Object-generated harmful factors
If halogen-free glass composition is used to eliminate fluorine gas emission, then environmental safety is improved, but generation of cracks and foreign materials occurs
Solution Approach 1:
The patent optimizes composition parameters within specific ranges (P2O5: 3-15 wt%, Al2O3: 5-20 wt%, CaO: 5-20 wt%, SiO2: 40-70 wt%) to control phase separation behavior during cooling, ensuring fine and uniform crystal distribution that prevents crack formation and foreign material generation while maintaining manufacturing precision
Solution Approach 2:
The patent utilizes controlled phase separation during the cooling process where phosphorus-containing compounds form fine crystalline phases dispersed in the glass matrix. This phase transition is carefully managed through composition design and cooling rate control to produce uniform fine crystals rather than large foreign materials or cracks
3Object-generated harmful factors
If halogen-free glass composition is used to eliminate fluorine gas emission, then environmental safety is improved, but white coloration becomes insufficient
Solution Approach 1:
The patent employs phase separation during cooling where phosphorus-containing compounds separate and form fine crystalline phases (such as calcium phosphate crystals) that scatter light effectively. This phase transition creates the milky appearance through controlled crystallization rather than relying on fluorine-based mechanisms
Solution Approach 2:
The patent creates a composite glass material containing dispersed crystalline phases within an amorphous glass matrix. The combination of phosphorus pentoxide, metal oxides, and silica forms a multi-phase composite structure that achieves superior white coloration through light scattering by the fine crystals, replacing fluorine-containing compositions
4Ease of manufacture
If uniform composition is used to simplify manufacturing, then ease of manufacture is improved, but phase separation stability deteriorates
Solution Approach 1:
The patent designs the composition with specific parameter ranges (P2O5: 3-15 wt%, Al2O3: 5-20 wt%, CaO: 5-20 wt%) that create a metastable state during cooling. This composition design ensures that phase separation occurs reliably and uniformly throughout the glass mass, achieving stable white coloration while maintaining ease of manufacture through a single homogeneous melt formulation
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 achieves a white glass container with excellent mechanical strength, rich white coloration, and smooth surface finish, while minimizing environmental impact and production defects.
Implementation Method 1
a white multilayer structure derived from a phase separation phenomenon of a composition for halogen-free glass
Data Source
AI summary
A white glass container derived from a phase separation phenomenon of a halogen-free glass composition includes a neck portion and a body portion. The glass composition includes as ingredients at least SiO2, P2O5, Al2O3, B2O3, R2O (R═Na or K), MgO, CaO and the like. The neck portion and the body portion respectively have a white multilayer structure formed to successively include a white transparent layer of relatively low white coloration and a white opaque layer of relatively high white coloration from the outer surface side. The contents of P2O5 in the white transparent layer are made smaller than the contents of P2O5 in the white opaque layer.