Discontinuous Polymer Tape Production via Variable Line Speeds
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Solution Overview
Problem
Existing methods for producing highly oriented non-fibrous polymer tapes are inefficient and lack flexibility in parameter selection, leading to suboptimal properties and increased breakages during production.
Innovation Solution
A discontinuous method involving forming, rolling, stretching, and drawing of polymeric sheets at varying line speeds to produce oriented or highly oriented non-fibrous polymer tapes, allowing for tailored production parameters and improved quality control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous method is used for producing polymer tapes, then productivity is improved, but manufacturing precision and reliability deteriorate due to increased breakages and lack of flexibility in parameter selection
Solution Approach 1:
The continuous production process is divided into distinct discontinuous stages: forming, rolling/stretching, and drawing. Each stage operates independently with optimized parameters, allowing quality control at each step while maintaining overall productivity. The segmentation enables temporary storage of intermediates, preventing defects from propagating through the entire process.
Solution Approach 2:
The patent implements periodic pauses between production stages, allowing for parameter adjustments and quality inspections. This periodic action replaces the continuous operation with controlled interruptions that enhance manufacturing precision without significantly reducing productivity, as each stage can be optimized independently.
2Productivity
If a continuous method with fixed line speeds is used, then productivity is improved, but adaptability deteriorates due to inability to adjust parameters for different production requirements
Solution Approach 1:
The patent introduces dynamic parameter adjustment capability at each production stage. Line speeds, temperatures, and drawing ratios can be independently optimized for each stage (forming, rolling, drawing) based on specific product requirements. This dynamic adaptability allows the same production line to manufacture different tape specifications without sacrificing productivity.
Solution Approach 2:
The invention enables independent parameter optimization at each production stage. Different line speeds, temperatures, and mechanical properties can be selected for forming, rolling/stretching, and drawing operations. This parameter flexibility allows adaptation to various polymer types and product specifications while maintaining efficient production throughput.
3Strength
If high orientation is achieved through continuous drawing, then mechanical strength is improved, but reliability deteriorates due to increased breakages during the process
Solution Approach 1:
The patent applies preliminary actions to prepare the polymer material for subsequent drawing operations. The forming and rolling/stretching stages pre-condition the polymer by establishing initial orientation and reducing internal stresses. This preliminary preparation reduces the risk of breakages during the final high-ratio drawing stage that achieves maximum mechanical strength.
Solution Approach 2:
The drawing process is segmented into multiple stages with progressively increasing draw ratios. Instead of attempting single-stage high-ratio drawing that causes breakages, the process divides orientation achievement into incremental steps, each with controlled strain rates and temperature conditions, thereby maintaining reliability while achieving high final strength.
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 method achieves economically viable production of tapes with similar properties to existing methods while reducing breakages and enabling better control over production processes, resulting in improved mechanical strength and antiballistic properties.
Implementation Method 1
forming and compression-moulding a polyethylene powder bed in a double band press
Implementation Method 2
The compression-moulded polymer is conveyed through a first calendar unit and heated to a temperature below the melting point of the polymer
Implementation Method 3
rolling and stretching the thus formed sheet in a double calendar unit
Implementation Method 4
rolling and stretching said sheet to form a partially oriented polymer web
Implementation Method 5
drawing the partially oriented polymer web in one or more drawing units
Implementation Method 6
drawing the partially oriented polymer web to form an oriented non-fibrous polymer tape
Data Source
AI summary
The invention relates to a method for producing a highly oriented, high molecular weight polymer tape. The method comprises forming and compression-molding a polymer powder bed at a temperature below the melting point of the polymer to form a sheet; at a temperature below the melting point of the polymer, rolling and stretching the sheet in a calendar unit to form a partially oriented polymer web; at a temperature below the melting point of the polymer, drawing the partially oriented polymer web in a drawing unit; and, optionally repeating step c) to form a more fully oriented non-fibrous high molecular weight polymer tape, the method being discontinuous in that the ingoing line speed of one of the method steps b) to d) differs from the outgoing line speed of the preceding method step.