Die Assembly Microcapillary Film Thickness Uniformity
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Solution Overview
Problem
Conventional die assemblies for producing microcapillary films suffer from high variation in film thickness, limiting their uniformity and functionality, particularly in applications requiring fine spray dispensing.
Innovation Solution
A die assembly comprising a first and second die plate connected by multi-jackbolt tensioners, a manifold defining film channels that converge into an elongate outlet, and nozzles connected to a channel fluid source to form microcapillary channels within the film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional die assemblies are used to produce microcapillary films, then the manufacturing process is simple, but the film thickness uniformity deteriorates (high variation in film thickness)
Solution Approach 1:
The die assembly is segmented into multiple independent adjustment zones along the width of the die, with each zone having its own adjustment mechanism. This allows localized control of film thickness in different regions, enabling precise compensation for thickness variations across the entire film width while maintaining a modular structure that doesn't overly complicate the overall design
Solution Approach 2:
The die assembly incorporates dynamic adjustment mechanisms that allow real-time modification of the gap between die plates during operation. This dynamic capability enables the system to adapt to varying material properties and processing conditions, maintaining uniform film thickness despite changes in extrusion parameters or material flow characteristics
2Manufacturing precision
If multi-jackbolt tensioners are used to reduce die plate deflection, then film thickness uniformity improves, but device complexity increases
Solution Approach 1:
The jackbolt tensioners serve multiple functions simultaneously: they apply clamping force to prevent die plate deflection, provide adjustable positioning to control gap uniformity, and enable quick release for maintenance. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving improved film thickness uniformity
3Adaptability or versatility
If film thickness uniformity is improved for lamination, then the suitability for spray dispensing applications increases, but conventional die assemblies cannot achieve this without modification
Solution Approach 1:
The die assembly enables precise control of critical parameters including gap width, clamping force distribution, and extrusion temperature profile. By independently adjusting these parameters across different zones of the die, the system can optimize film thickness uniformity to meet the stringent requirements for spray dispensing applications, where even minor thickness variations can affect capillary channel formation and spray performance
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 die assembly significantly reduces vertical and horizontal deflection, resulting in microcapillary films with low thickness variation, enhancing their uniformity and suitability for applications like spray dispensing.
Implementation Method 1
a plurality of multi-jackbolt tensioners connecting the first die plate to the second die plate
Implementation Method 2
a thermoplastic material is extrudable through the plurality of film channels and the elongate outlet to form a microcapillary film
Implementation Method 3
a plurality of nozzles operatively connected to a source of channel fluid for emitting the channel fluid between layers of the microcapillary film whereby a plurality of microcapillary channels are formed in the microcapillary film
Data Source
AI summary
The present disclosure provides a die assembly for producing a microcapillary film. The die assembly includes a first die plate, a second die plate, a plurality of multi-jackbolt tensioners connecting the first die plate to the second die plate, a manifold, and a plurality of nozzles. The manifold is located between the pair of die plates and defines a plurality of film channels therebetween. The plurality of film channels converge into an elongate outlet, wherein a thermoplastic material is extrudable through the plurality of film channels and the elongate outlet to form a microcapillary film. The plurality of nozzles are located between the plurality of film channels. The plurality of nozzles are operatively connected to a source of channel fluid for emitting the channel fluid between layers of the microcapillary film, whereby a plurality of microcapillary channels are formed in the microcapillary film.