Zip strips for molding of infused fiberglass products
A method of removing a vacuum bag from a composite mold. Removable strips are placed around the perimeter of the component parts and across the parts to create natural break points in the consumable materials used during manufacture of a composite product, e.g. wind turbine blade. The vacuum bag, and other consumable layers, are placed over the removable strip such that when the strips are pulled, the strip tears, in a controlled and complete manner, through each layer of consumables. This eliminates the need to use a knife/scissor to remove the finished product, thereby avoiding risk of injury.
1. A method of removing a vacuum bag from a wind turbine blade mold comprising:
providing a mold for forming a wind turbine blade;
disposing at least one glass fiber layup segment within the mold;
providing at least one removable strip, the at least one removable strip disposed around at least a portion of a perimeter of the at least one glass fiber layup segment,
disposing at least one consumable layer above the at least one removable strip;
disposing a portion of a vacuum bag above the at least one removable strip;
infusing the at least one glass fiber layup segment with resin;
pulling the at least one removable strip, wherein a pulling force tears through the at least one consumable layer and the vacuum bag.
2. The method of claim 1 , wherein the at least one removable strip tears through the at least one consumable layer in a predetermined path.
3. The method of claim 1 , wherein the at least one removable strip has thickness of approximately 0.028 inches, a width of approximately 0.5 inches, a break strength of approximately 820 pounds, and a melting point of approximately 490° Fahrenheit.
4. The method of claim 1 , wherein the at least one removable strip is placed directly on glass.
5. The method of claim 1 , wherein once all of the at least one removable strip is removed, the at least one consumable layer and vacuum bag are tied with the at least one removable strip.
6. The method of claim 1 , wherein the at least one removable strip imparts a recess in the at least one glass fiber layup segment after removal.
7. The method of claim 6 , further comprising applying tacky tape at the recess.
8. The method of claim 1 , wherein the at least one removable strip is disposed around the mold on a clamp edge between a top clamp edge and a bottom clamp edge.
9. The method of claim 1 , wherein the at least one removable strip has a first end disposed at 1.5 m from a root end of the at least one glass fiber layup segment and extends to a tip on both a leading edge and trailing edge side of the mold.
10. The method of claim 1 , wherein the at least one removable strip includes a handle at an end of the at least one removable strip.
11. The method of claim 1 , wherein the at least one removable strip is disposed at either approximately 1500 mm, 12,000 mm, or 27,500 mm from a root end.
12. The method of claim 1 , wherein the at least one removable strip is dispensed from a root of the mold to a tip.
13. The method of claim 12 , wherein the at least one removable strip is dispensed laterally into the mold.
14. The method of claim 12 , wherein the at least one removable strip is dispensed downwardly into the mold.
15. The method of claim 12 , wherein a spar cap and split lines of the mold remain free of the at least one removable strip.
16. The method of claim 1 , wherein a segment of the at least one removable strip is dispensed proximate to a root of the mold and extended to a tip of the mold.
17. The method of claim 1 , wherein the at least one removable strip is installed onto a flange of the mold and cut at the 1.5 m mark from a root of the mold.
18. The method of claim 1 , wherein an opening is formed in the vacuum bag to access an end of the at least one removable strip.
19. The method of claim 1 , further comprising a guide to create a predefined flow path for resin distribution.
20. The method of claim 19 , wherein the at least one removable strip does not break through the guide upon removal.