Tape Cross-Section Stabilization for Molded Parts
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Solution Overview
Problem
Existing methods for producing tapes with reinforcing staple fibers for molded parts often result in round cross-sections, require twisting or winding, which can alter fiber alignment and distribution, and subject fibers to unnecessary stress, leading to suboptimal mechanical properties and increased manufacturing complexity.
Innovation Solution
A method involving a shaping device to set the sliver into a predetermined cross-section, which is then stabilized by a fixing device, allowing the tape to maintain this shape and retain fiber alignment, eliminating the need for twisting or winding, and incorporating a drafting system for unidirectional fiber alignment, and using thermoplastic or resin impregnation for fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sliver is twisted or wound by common spinning processes to produce a yarn-like ribbon, then the ribbon has sufficient strength for further processing, but the cross-section becomes necessarily round and the fiber alignment is altered
Solution Approach 1:
The process is segmented into two independent functions: a shaping device that imparts the predetermined cross-section to the sliver, and a fixing device that stabilizes this cross-section. This segmentation allows the cross-section to be predetermined (non-round) while still achieving sufficient strength through the fixing mechanism, eliminating the need for twisting or winding that would force a round cross-section.
Solution Approach 2:
The shaping device acts as an intermediary that transforms the sliver's cross-section into a predetermined non-round shape before the fixing device stabilizes it. This intermediary step allows the sliver to assume the desired cross-section without requiring twisting or winding processes that would alter fiber alignment and force a round shape.
2Strength
If the sliver is twisted or wound to produce a yarn-like ribbon, then the ribbon has sufficient strength, but the alignment and distribution of reinforcing staple fibers is changed
Solution Approach 1:
By separating the strength-providing function (fixing device) from the shape-imparting function (shaping device), the invention eliminates the need for twisting or winding. This allows the reinforcing staple fibers to maintain their original alignment and distribution from the carding process, while the fixing device provides the necessary strength stabilization without altering fiber orientation.
Solution Approach 2:
The sliver's cotton-like structure naturally provides the framework for fiber alignment, and the fixing device simply stabilizes this existing structure rather than reconfiguring it through twisting or winding. This self-service approach preserves the homogeneous fiber distribution achieved during carding while still providing sufficient strength for processing.
3Strength
If the sliver is twisted or wound to produce a yarn-like ribbon, then the ribbon has sufficient strength for further processing, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process is simplified by segmenting it into two straightforward sequential steps: shaping (imparting cross-section) and fixing (stabilizing the cross-section). This eliminates the complex twisting or winding operations required by conventional spinning processes, reducing both device complexity and process steps while maintaining sufficient ribbon strength for further processing.
4Productivity
If the sliver is brought into a predetermined cross-section and fixed, then the manufacturing process is shortened and fiber stress is reduced, but the cross-section must be stabilized
Solution Approach 1:
The fixing device serves as an intermediary that stabilizes the predetermined cross-section imparted by the shaping device. This stabilization is necessary to maintain the cross-section during transport and further processing, but the fixing process is designed to be simpler than conventional twisting or winding, thus reducing overall manufacturing complexity while achieving the required stability.
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 method enables the production of tapes with improved mechanical properties, homogeneous fiber distribution, and enhanced drapability, suitable for complex moldings, while reducing manufacturing steps and fiber stress, resulting in stronger and lighter molded parts with better alignment and distribution of reinforcing fibers.
Implementation Method 1
the sliver containing the reinforcing staple fibers is guided through a shaping device so that it is brought into a predetermined cross section
Implementation Method 2
the sliver brought into the predetermined cross section is shaped by means of a fixing device is fixed so that the predetermined cross section is stabilized
Implementation Method 3
the sliver brought into the predetermined cross section is fixed by heating the thermoplastic staple fibers, so that the thermoplastic staple fibers are welded
Data Source
Figure 1~4
Figure 5~8
AI summary
Producing strips (2) for producing molded parts comprising a polymer matrix and reinforcing staple fibers (3) embedded in the polymer matrix, using at least one fiber strip comprising the reinforcing staple fibers, comprises guiding the fiber strip comprising the reinforcing staple fibers through a molding device such that the fiber strip is brought into a predetermined cross-section on the output side of the molding device, and fixing the fiber strip brought into the predetermined cross-section, by a fixing device such that the predetermined cross-section is stabilized. Independent claims are also included for: (1) strips for producing the molded parts, produced by the above method; (2) a textile sheet material for producing the molded parts, comprising the strip; (3) the molded part formed by pressing the above textile sheet material; and (4) a device for producing the strip, comprising the molding device and the fixing device arranged downstream of the molding device.