a recommended guideline for how to work with te xtreme spread tow fabrics
DESCRIPTION
In order to make best use of TeXtreme® and to give some advice on how to work with Spread Tow Fabrics we have developed an illustrative guide.This guide will aid in teaching how to use TeXtreme® Spread Tow Fabrics effectively and to utilize the full potential of the benefits that TeXtreme® brings.TRANSCRIPT
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A recommended guideline for how to work with TeXtreme® Spread Tow Fabrics
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TeXtreme® Spread Tow Fabrics are based on Oxeon's Tape Weaving Technology that uses tapes instead of yarn. In any given area more fibers can be packed in tape form than in a yarn. A woven material comprising interlacing fibrous tapes, instead of yarns, displays a substantially reduced number of interstices/openings. This means that a tape woven structure presents less accumulation of matrix at the interstices and hence increased fiber volume fraction.
This guide will aid in learning to use TeXtreme® Spread Tow Fabrics effectively
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Tools to be used in this guide: Hairdryer, lamination tool, knife, scissors.
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Take advantage of the distinct lines seen through release film when laying the patterns at 0-, 90- and +/-45 or other ply orientations.
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Use tool surfaces that are polished and release agents with relatively high degree of slip.
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Start with a +/-45 ply if possible which makes draping in the sharp corners easier with less spring back. Choose initial starting piece according to internal layup procedure/standard.
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Start at the tightest section working towards larger less complicated areas.
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Work along 45-degree direction and soften the resin by using a hair dryer or heat gun to allow the fabric to scew.
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Use helping aids at tight corners, do not use any sharp metal objects. Bridging needs to be addressed to assure good definition in corners.
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Make sure to evacuate all air before debulking so no air bubbles are present (highlighted section in the image).
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Cut darts at complex geometries to avoid folds/creases.
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Cut away excessive material to allow consolidation at all corners. This helps in reducing the risk of bridging.
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Always debulk the fist ply! Perforated release film is recommended during this step due to the dense nature of TeXtreme®.
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Follow standard bagging techniques. To maintain consistent vacuum pressure, the breather should cover the entire laminate.
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The vacuum valve should be positioned outside of the laminate with a breather connection to maintain vacuum flow.
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Ensure that the bag is not bridging at any corners, be careful not to cause a tear or puncture of the bag.
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Envelope bag the tool when possible to avoid tool leakage leading to poor air evacuation.
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Vent possible bubbles to avoid trapping air at tool surface using needle or similar being careful not to scratch the mold surface.
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Start 2nd ply using the same sequence as the first, making darts where needed.
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By using a hair dryer or heat gun the TeXtreme® fabric can be scewedwhere needed (highlighted in the image above).
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Stagger ply drop-offs at stiffened sections. There is no need to repeatedly debulk unless six layers or more are being used or otherwise recommended by prepreg manufacturer(s).
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Use release films recommended by the prepreg manufacture(s).
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Follow standard bagging procedure.
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Use thermocouple that measures the temperature at the tool and not in the air. Following the prepreg manufactures cure cycle is important to achieving a high quality surface smoothness.
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Some resin will bleed, as normal for fiber reinforced composites.
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Demold the part. Notice well defined tight corners with no bridging on the relatively complex geometry of the finished part.