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Straight tee Lacing with Epoxy

Straight tee Lacing with Epoxy. B. Stratton, S. Raftopoulos, and E. Gilsenan 8-15-05. Overview. Double-sided tape works well to hold lacing ends together but there is concern that heat of VPI process could melt adhesive Epoxy will prevent this

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Straight tee Lacing with Epoxy

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  1. Straight tee Lacing with Epoxy B. Stratton, S. Raftopoulos, and E. Gilsenan 8-15-05

  2. Overview • Double-sided tape works well to hold lacing ends together but there is concern that heat of VPI process could melt adhesive • Epoxy will prevent this • Part of side two of straight tee was rebuilt with all-around lacings (yellow pattern) • Lacing tightening tool used • Hysol epoxy (room temperature cure) applied in two ways: • Clamps 1-3: epoxy applied only in ~1” region below double-sided tape • Clamps 4-6: epoxy applied over entire exposed area of glass tape (not desirable because it would impede epoxy penetration during VPI process)

  3. Changes in pack width and height when clamps are released • Changes are values with top and side clamps loose minus values with top clamps torqued to 30 in-lbs and side clamps against stops • Width changes are small • Average height changes are 0.030” for positions 2-3 and 0.023” for positions 4-5 (positions 1 and 6 not included to avoid end effects)

  4. Change in pack width and height when pack is vertically compressed • Changes are values with top clamps torqued to 35 in-lbs and side clamps loosened minus values with top clamps torqued to 30 in-lbs and side clamps against stops • Width change small • Average height change is -0.026” for positions 2-3 and -0.016” for positions 4-5

  5. Conclusion • Baseline plan is to use all-around lacing tightened with tightening tool; lacing ends attached with double-sided tape and ~1” of Hysol epoxy on side below double-sided tape • Will give adequate dimensional control of winding pack width and height • Coating entire exposed area of glass tape with epoxy gives somewhat better control of pack height than coating a ~1” high area, but is not acceptable because the large area involved would impede epoxy penetration during the VPI process

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