Construction And Working Details Of Pultrusion Process z4q6f

Construction and working details of pultrusion process

BY PRAKASH C SPG 06 18 023

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Contents  Introduction to pultrusion  Process setup  Pultrusion reinforcements  Pultrusion matrices

 Consolidation  Advantages and disadvantages  Applications

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Pultrusion  Pultrusion is a continuous process for manufacture of composite materials with constant cross-section

 Pulling of material such as Fiberglass and Resin, through a shaped and heated die.  Pulforming - It is used to make elements which might be curved or may have variations in cross section throughout their lengths

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Construction & working :

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Description of Pultrusion Machine:  Creel

 Puller or driving mechanism

 Resin wet out tank

 Cut-off saw.

 Forming dies

 Mandrel

 Heated matched metal die

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Parts: Creel- Filament feeding, where in the fibers are unreeled from a creel (shelves with skewers that hold filament bobbins)

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Resin wet out tank, where in the fibers are dipped in the uncured liquid resin Material : Sheet of aluminium and with a set of rollers

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Preforming fixtures- the collection of filaments is gradually shaped into the approximate cross section desired Material : Fluorocarbon or ultra high molecular weight polyurethanes

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Heated Dies - Chrome plated matched metal die  Replica of the product  Desired shapes – highly polished internal surfaces  Thin section – Heat conduction

 Thick section – RF and conduction

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Pulling section  Pulling - A pair of continuous caterpillar belts containing pads

cut by a cut-off wheel with SiC or diamond grits

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Cutting section

 Mechanial - SiC and Diamond grits  Laser

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Materials options : Pultrusion Reinforcements  Fiberglass  Carbon fiber  Aramid fiber Pultrusion Matrices

 Epoxy,  Polyester  Vinyl ester and phenolic

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Working and Applications:

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Applications of Pultrusion:  Electrical application including transformers  s in bridges and structures  Automobiles  Pipes and rods

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Advantages:  The process is suitable for mass production  Fast and Economic  Resin content can be accurately controlled  Increased Strength (fiber processed under tension, straight fibers)  Consistent Quality

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Disadvantages:  Limited to constant or near constant cross-section components  Heated die costs can be high

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References: www.nptel.com www.gurit.com www.libertypultrusions.com www.pultruders.com

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Any Queries ?

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Thank you

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