Increasing the performance of continuous compression moulding by local pressure adaption

Piott, Florian; Krämer, Andreas; Lück, André; Hoffmann, Leo; Mitscháng, Peter; Drummer, Dietmar

doi:10.1080/20550340.2021.1888209

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…The B-factor model was originally developed in order to allow the transfer of the optimum impregnation parameters determined in a laboratory test to a series production line. The B-factor, as a dimensionless constant, summarizes process parameters such as pressure p and time t, as well as the temperature dependent viscosity η(T(t)) [54]. The first part of the B-factor is the b-integral, described in Equation (1):…”

Section: Fibersmentioning

confidence: 99%

Challenges in Manufacturing of Hemp Fiber-Reinforced Organo Sheets with a Recycled PLA Matrix

Salmins,

Gortner,

Mitschang

2023

Polymers

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This study investigates the influence of a hot press process on the properties of hemp fiber-reinforced organo sheets. Plain-woven fabric made from hemp staple fiber yarns is used as textile reinforcement, together with a recycled poly-lactic acid (PLA) matrix. Process pressure and temperature are considered with three factor levels for each parameter. The parameter influence is examined based on the B-factor model, which considers the temperature-dependent viscosity of the polymer, as well as the process pressure for the calculation of a dimensionless value. Increasing these parameters theoretically promotes improvements in impregnation. This study found that the considered recycled polymer only allows a narrow corridor to achieve adequate impregnation quality alongside optimal bending properties. Temperatures below 170 °C impede impregnation due to the high melt viscosity, while temperature increases to 185 °C show the first signs of thermal degradation, with reduced bending modulus and strength. A comparison with hemp fiber-reinforced virgin polypropylene, manufactured with identical process parameters, showed that this reduction can be mainly attributed to polymer degradation rather than reduction in fiber properties. The process pressure should be at least 1.5 MPa to allow for sufficient compaction of the textile stack, thus reducing theoretical pore volume content to a minimum.

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Section: Fibersmentioning

confidence: 99%

Challenges in Manufacturing of Hemp Fiber-Reinforced Organo Sheets with a Recycled PLA Matrix

Salmins,

Gortner,

Mitschang

2023

Polymers

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“…The emergence of new CFRTP (carbon fiber reinforced thermoplastic polymers) manufacturing technologies makes it necessary to continue investigating consolidation parameters, especially when these technologies differ from the standard due to their continuous application-such as glide forming [9][10][11][12] and Continuous Compression Molding [13][14][15]).…”

Section: Introductionmentioning

confidence: 99%

Statistical Study of the Process Parameters for Achieving Continuous Consolidation of a Thermoplastic Composite

Campos,

Maimí,

Martín

2023

Materials

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Manufacturing components using thermoplastic composite materials necessitates a judicious balance among fabrication parameters, cost considerations and the ultimate quality of the elements produced. Continuous manufacturing technologies, exemplified by methods such as continuous compressing molding and glide forming, seek to revolutionize production through their continuous processing approach. This study aimed to investigate the effects different process parameters have on the final quality of the manufactured parts when a continuous manufacturing technology, such as glide forming, is applied to thermoplastic composite materials. An experimental rig was designed, and 19 samples were prepared using a unidirectional-carbon-fiber-reinforced LM-PAEK (low-melting polyaryletherketone) composite. The process parameters studied were temperature, pressure and forming speed. The quality of the final parts was evaluated based on their thickness and consolidation levels. The findings underscore the feasibility of leveraging continuous manufacturing technologies for producing components using thermoplastic composite materials, but the process parameters must be carefully controlled to ensure the quality of the final part. The models obtained could be used as a post-processing tool to predict thickness and consolidation levels when simulating the manufacture of a component on macroscale levels. Further research is needed to optimize the process parameters and study their effects on other thermoplastic composite materials.

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Influence of the processing on the properties of continuous fiber reinforced thermoplastic sheets prepared by extrusion

Puch,

Richter

2023

AIP Conference Proceedings

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Increasing the performance of continuous compression moulding by local pressure adaption

Cited by 5 publications

References 6 publications

Challenges in Manufacturing of Hemp Fiber-Reinforced Organo Sheets with a Recycled PLA Matrix

Challenges in Manufacturing of Hemp Fiber-Reinforced Organo Sheets with a Recycled PLA Matrix

Statistical Study of the Process Parameters for Achieving Continuous Consolidation of a Thermoplastic Composite

Influence of the processing on the properties of continuous fiber reinforced thermoplastic sheets prepared by extrusion

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