Laser Crystallinity Control for Polymeric Fluid Containers
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Solution Overview
Problem
Conventional polymeric syringes and fluid containers face challenges in achieving precise control over crystallinity, which affects their material properties such as rigidity, transparency, and durability, particularly in medical and beverage applications where specific properties are required for functionality and safety.
Innovation Solution
The method involves using laser heating to selectively increase the crystallinity of polymeric materials in specific regions of fluid containers, such as rolling diaphragm syringes, by heating them above the glass transition temperature to form localized crystalline regions with enhanced properties like strength and opacity, while maintaining amorphous regions for flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional heating methods (direct heating or infrared heating) are used during molding or extrusion, then the polymeric material achieves sufficient crystallinity for structural integrity, but the crystallinity distribution is non-uniform and difficult to control precisely in specific regions
Solution Approach 1:
The patent applies local quality by using laser heating to selectively increase crystallinity in specific regions of the polymeric fluid container. The laser beam can be directed to treat only predetermined areas such as the sidewall, end wall, or neck region, creating localized crystalline structures with precise control over crystallinity distribution. This resolves the contradiction by achieving region-specific crystallinity control without requiring complex overall heating systems.
Solution Approach 2:
The patent replaces conventional mechanical or thermal heating systems (direct heating or infrared heating) with laser heating technology. The laser provides a focused, controllable energy source that can precisely heat specific regions without the complexity of traditional heating apparatus. This substitution achieves superior crystallinity control precision while simplifying the heating system design.
2Strength
If the polymeric material is made more crystalline to increase strength and rigidity, then the structural integrity and pressure resistance improve, but the material becomes more opaque and less flexible
Solution Approach 1:
The patent uses laser heating to create localized crystalline regions in specific areas of the fluid container while leaving other regions with lower crystallinity. For example, the sidewall can be treated to achieve high strength and pressure resistance, while the end wall or neck regions maintain lower crystallinity for flexibility or transparency requirements. This spatial differentiation resolves the contradiction by allowing different optical and mechanical properties in different regions of the same container.
3Strength
If laser heating is applied to increase crystallinity in specific regions, then localized structural strength and pressure resistance are enhanced, but the manufacturing process complexity increases
Solution Approach 1:
The patent replaces complex multi-zone heating systems or post-molding crystallization equipment with a laser heating system. The laser provides precise, programmable control over which regions receive heating treatment, eliminating the need for complex thermal management systems. The laser parameters (power, duration, scan pattern) can be easily adjusted to achieve desired crystallinity levels, simplifying the overall manufacturing process while maintaining flexibility.
4Ease of manufacture
If conventional syringes are made with uniform polymeric material properties, then manufacturing is simpler, but specific regions cannot be optimized for different functional requirements
Solution Approach 1:
The patent applies local quality by using laser heating to create region-specific crystallinity variations in the syringe body. The sidewall can be treated to achieve high crystallinity for strength and rolling flexibility, while the end wall or piston contact regions maintain lower crystallinity for sealing properties or transparency. This allows the syringe to be manufactured as a single piece with optimized properties in different regions, combining manufacturing simplicity with functional versatility.
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 allows for the precise control of material properties, enhancing the structural integrity and functionality of polymeric fluid containers, improving their ability to handle pressures and maintain carbonation in beverage bottles, while also reducing weight and gas permeability.
Implementation Method 1
heating them above the glass transition temperature to form localized crystalline regions
Implementation Method 2
heating them above the glass transition temperature
Implementation Method 3
to form localized crystalline regions with enhanced properties like strength and opacity
Data Source
AI summary
A fluid container having a proximal end having an end wall, a distal end having an open-ended neck, and a sidewall extending between the proximal end and the distal end along a longitudinal axis is described. A localized crystallinity of a polymeric material of the fluid container of at least a first region of the fluid container is greater than a crystallinity of a polymeric material of the fluid container of at least a second region. Examples of fluid containers include medical fluid containers, such as medical bottles and syringes, including rolling diaphragm-type syringes, and commercial beverage containers Articles of manufacturer formed form a polymeric material and having regions with increased localized polymeric crystallinity are also described.