Blade constructs and methods of forming blade constructs
View Patent ↗A dual-core blade and method for manufacturing a dual-core blade are disclosed. The blade is formed with a first core portion and a second core portion comprising an epoxy having a plurality of expanded microspheres. The method of forming the two foams generally comprises sizing a foam core to form a first core portion and providing and preparing an epoxy mixture to form a second core portion. The first core portion and the second core portion of the epoxy mixture are placed into a preform, and the preform is heated slightly so as to cause the epoxy mixture to flow into the shape of the preform and around the first core portion. The first core portion and the second core portion are then bonded in a molding operation. The formed structure can form part of a hockey stick blade.
1. A method comprising:
sizing a foam core to form an upper first core portion, the upper first core portion having a concave portion;
providing an unformed, malleable epoxy mixture to form a lower second core portion in a first unformed shape;
placing the first core portion and the second core portion into a preform having a preform shape;
heating the preform so as to cause the epoxy mixture forming the lower second core portion to flow and mold to form a corresponding convex portion in the concave portion of the first core portion to define a second formed shape different from the first unformed shape and wherein the first core portion is formed taller than the second core portion in a heel region and the second core portion is formed taller than the first core portion in a toe region;
wrapping the first core portion and the second core portion with fiber tape to create a wrapped preform;
stitching the first core portion with a thread, the thread extending between a first wrapped face and a second wrapped face of the wrapped preform;
placing the wrapped preform in a mold;
heating the mold to bond the first core portion and the second core portion;
cooling the mold; and
removing the formed structure from the mold.
2. The method according to claim 1 further comprising curving the first core portion prior to placing the first core portion into the preform.
3. The method according to claim 2 wherein the first core portion and the second core portion are wrapped with a layer carbon fiber.
4. The method according to claim 3 wherein the layer of carbon fiber comprises a first sheet and a second sheet and wherein the first core portion and the second core portion are placed on the first sheet and wherein the first sheet is wrapped around portions of the first core portion and the second core portion and wherein the second sheet is placed over the first core portion and the second core portion prior to placing the first core portion and the second core portion into the preform.
5. The method according to claim 1 wherein the second core portion mixture further comprises a plurality of expanded and partially expanded microspheres and wherein when the mold is heated the partially expanded microspheres fully expand.
6. The method according to claim 1 wherein the second core portion mixture further comprises a plurality of expanded and unexpanded microspheres and wherein when the mold is heated the unexpanded microspheres fully expand.
7. The method according to claim 1 further comprising the step of, after wrapping the foam core with a layer of fiber tape, placing a non-tacky veil on at least a portion of the first core portion.
8. The method of claim 1 wherein the concave portion of the first core portion and the convex portion of the second portion are located in the heel region.
9. The method of claim 8 wherein the first core portion forms a convex portion and wherein the second core portion when heated forms a corresponding concave portion around the convex portion of the first core portion.
10. The method of claim 9 wherein the convex portion of the first core portion and the concave portion of the second core portion are located in a toe region of the hockey blade construct.
11. The method of claim 10 wherein the thread is stitched in a U-shaped pattern in the heel region.
12. The method of claim 8 wherein the concave portion of the first core portion provides for the second core portion to flow and fill more evenly in the mold during heating the mold to bond the first core portion and the second core portion.
13. The method of claim 1 wherein the first core portion is stitched in the heel region.
14. A method comprising:
sizing a foam core to form a first core portion defining a first core portion shape;
providing a malleable epoxy mixture to form a second core portion in a first unformed shape;
placing the first core portion and the second core portion into a preform having a preform shape;
heating the preform so as to cause the epoxy mixture forming the lower second core portion to form into a formed shape different from the unformed shape and corresponding to the first core portion shape;
wrapping the first core portion and the second core portion with fiber tape to create a wrapped preform;
placing the wrapped preform in a mold;
heating the mold to bond the first core portion and the second core portion;
cooling the mold; and
removing the formed structure from the mold.
15. The method of claim 14 wherein the first core portion forms a concave portion and the second core portion when heated forms a corresponding convex portion in the concave portion of the first core portion to form a hockey blade construct and wherein the concave portion of the first core portion and the convex portion of the second portion are located in the heel region.
16. The method of claim 15 wherein the first core portion forms a convex portion and wherein the second core portion when heated forms a corresponding concave portion around the convex portion of the first core portion.
17. The method of claim 16 wherein the convex portion of the first core portion and the concave portion of the second core portion are located in a toe region of the hockey blade construct.
18. The method of claim 15 wherein the concave portion of the first core portion provides for the second core portion to flow and fill more evenly in the mold during heating the mold to bond the first core portion and the second core portion.