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Title: Preparation of aligned, discontinuous fibres felts
Author: Mirza, S.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1982
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A dry process for the alignment of short fibres has been developed. In this process, the fibre clumps are first teased off in the fibre separation apparatus to generate a suspension of single fibres in an air stream which is then processed in the alignment apparatus. The alignment apparatus consists of an array of closely spaced parallel wires or strips. The alignment of fibres is achieved by passing the suspension through the array and by moving the adjacent wires or strips in opposite directions. The aligned fibres are then collected on a mesh underneath the array. Experiments were carried out to study the effectiveness of the apparatus in aligning fibres. Different types (glass and carbon) and sizes (3-9 mm long) of fibres were used. A theoretical study of fibre motion due to shear stresses induced in the air by the motion of wires or strips was also carried out. The results show that hydrodynamic rotation was much higher between the strips than the wires. It was suggested that hydrodynamic fibre alignment should be taken into account together with mechanical alignment (due to contact with the strips) when choosing the spacing between the strips. This results in the ability to obtain the same degree of alignment using a wider strip spacing, as was previously expected with a narrow spacing, but with increased throughput rates. Suggestions are made for the design of a continuous process using the above technique, which it is hoped will be of interest in the bulk production of fibre reinforced composites.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available