Mixed material golf club head
A golf club head includes a rear body having a crown member coupled to a sole member, and a front body coupled to the rear body to define a substantially hollow structure. The front body includes a strike face and a surrounding frame that extends rearward from a perimeter of the strike face. The front body further includes a fabric reinforced thermoplastic composite layer and a filled thermoplastic layer each extending across the entire strike face. The fabric reinforced thermoplastic composite layer and the filled thermoplastic layer each comprise a common thermoplastic resin component, and are directly bonded to each other without an intermediate adhesive.
1. A golf club head comprising:
a rear body including a crown member and a sole member;
a front body coupled to the rear body to define a substantially hollow structure, the front body including a strike face and a surrounding frame that extends rearward from a perimeter of the strike face, wherein the front body comprises:
a fabric reinforced thermoplastic composite layer and a filled thermoplastic layer each extending across the entire strike face,
wherein the fabric reinforced thermoplastic composite layer and the filled thermoplastic layer each comprise a common thermoplastic resin component; and
wherein the fabric reinforced thermoplastic composite layer and the filled thermoplastic layer are directly bonded to each other without an intermediate adhesive;
wherein the sole member comprises:
a sole structural layer formed from a filled thermoplastic material, the sole structural layer including a plurality of apertures extending through a thickness of the sole structural layer; and
a sole resilient layer bonded to an external surface of the sole structural layer such that the sole resilient layer extends across each of the plurality of apertures, wherein the sole resilient layer is formed from a fiber-reinforced thermoplastic composite material;
wherein the sole structural layer and the sole resilient layer each comprise a common thermoplastic resin component, and wherein the sole structural layer is directly bonded to the sole resilient layer without an intermediate adhesive.
2. The golf club head of claim 1 , wherein the filled thermoplastic layer of the front body has a non-uniform thickness across the strike face.
3. The golf club head of claim 1 , wherein the strike face includes an outward-facing ball striking surface and a rear surface opposite the ball striking surface, and wherein the fabric reinforced thermoplastic composite layer forms the rear surface.
4. The golf club of claim 1 , wherein the structural layer further includes:
a forward portion in contact with, and bonded to the metallic front body;
a weighted portion spaced apart from the forward portion;
a structural member extending from the forward portion to the weighted portion and between at least two of the plurality of apertures, the structural member is integrally molded with both the forward portion and the weighted portion; and
the sole member further including a metallic weight at least partially embedded in, or adhesively bonded to the weighted portion of the sole structural layer.
5. The golf club head of claim 4 , wherein the filled thermoplastic layer forms an outward-facing surface of the front body and includes at least one of:
a functional texture; or
a plurality of protrusions that extend outward from an outer surface of the club head;
wherein the functional texture or plurality of protrusions are operative to alter an aerodynamic property of the club head.
6. The golf club head of claim 1 , wherein the fabric reinforced thermoplastic composite layer of the front body has a constant thickness.
7. The golf club head of any of claim 1 , wherein the filled thermoplastic layer of the front body includes a plurality of discontinuous fibers embedded in a thermoplastic matrix, each fiber having a respective orientation of a longitudinal axis of the fiber.
8. The golf club head of claim 7 , wherein the strike face includes a toe portion, a heel portion, and a center; and wherein, between the center of the strike face and the heel portion, greater than about 50% of an embedded fiber content within the filled thermoplastic layer of the front body is aligned within 30 degrees of a face axis extending between the toe portion and the heel portion and parallel to a ground plane when the club head is held at a neutral address position on the ground plane.
9. The golf club head of claim 1 , wherein the filled thermoplastic layer of the front body includes a flow leader extending between a toe portion of the strike face and a center of the strike face, the flow leader being a thickened portion of the filled thermoplastic layer relative to abutting portions of the strike face.
10. The golf club head of claim 1 , wherein the front body further includes a plurality of fabric reinforced thermoplastic composite layers, each fabric reinforced thermoplastic composite layer having a fiber orientation that is different from an orientation of at least one directly abutting fabric reinforced thermoplastic composite layer; and
each fabric reinforced thermoplastic composite layer having a thermoplastic resin that is fused with the thermoplastic resin of each directly abutting layer.
11. The golf club head of claim 1 , wherein the fabric reinforced thermoplastic composite layer of the front body forms at least a portion of the frame.
12. The golf club head of claim 1 , wherein the filled thermoplastic layer of the front body includes a metallic mesh embedded therein, and wherein a resin of the filled thermoplastic layer extends within a plurality of apertures defined by the mesh.
13. The golf club head of claim 1 , wherein the filled thermoplastic material of the sole structural layer is fused to the filled thermoplastic material of the front body without an intermediate adhesive.
14. The golf club head of claim 1 , wherein the common thermoplastic resin component comprises polyphenylene sulfide or polyether ether ketone.
15. The golf club head of claim 1 , wherein the frame includes a crown portion and a sole portion, wherein the golf club head includes a heel region, a toe region, and a central region disposed between the heel region and the toe region;
wherein the sole portion of the frame defines a rearward edge that extends a first average distance from the strike face within the heel region, a second average distance from the strike face within the toe region, and a third average distance from the strike face within the central region; and
wherein the third average distance is greater than both the first average distance and the second average distance.
16. The golf club head of claim 1 , wherein the fabric reinforced thermoplastic composite layer of the front body comprises a multi- or uni-directional fabric embedded within a first thermoplastic resin; and
wherein the filled thermoplastic layer of the front body comprises a plurality of discontinuous fibers embedded within a second thermoplastic resin.
17. The golf club head of claim 16 , wherein the fabric reinforced thermoplastic composite layer of the front body comprises the first thermoplastic resin in an amount of less than about 45% by volume; and
wherein the filled thermoplastic layer of the front body comprises the second thermoplastic resin in an amount of greater than about 45% by volume.
18. The golf club head of claim 1 , wherein the sole structural layer includes a weighted portion having a metallic mass embedded therein.
19. The golf club head of claim 18 , wherein the metallic mass is a metallic filler embedded within a thermoplastic resin of the structural layer.
20. The golf club head of claim 1 , wherein:
the crown member comprises a fiber-reinforced composite material; and
the crown member is bonded to the sole member at a joint, by a means selected from the group consisting of: localized welding, adhesive bonding, and mechanical affixment.