Fluid-filled chambers with foam tensile members and methods for manufacturing the chambers
A fluid-filled chamber may include an outer barrier formed from a polymer material and a foam tensile member located within the outer barrier. In manufacturing the fluid-filled chamber, a mold may be contoured to substantially equalize compressive forces between the outer barrier and various portions of the tensile member, thereby providing substantially uniform bonding between the outer barrier and the tensile member. Surfaces of the tensile member may also be contoured to substantially equalize compressive forces. In some configurations, the outer barrier and tensile member may be formed from thermoplastic polymer materials that form a direct bond between the outer barrier and surfaces of tensile member.
1. A method of manufacturing a fluid-filled chamber, the method comprising:
placing a tensile member between a first layer and a second layer of polymer material, the tensile member having a first portion with greater compressibility than a second portion, the first portion being joined with the second portion and formed as a one-piece element, and a surface of the tensile member forming a protrusion in the first portion;
locating the tensile member, the first layer, and the second layer within a mold that defines a void for forming the chamber; and
compressing the tensile member, the first layer, and the second layer within the mold to bond the first layer and the second layer to the tensile member, the mold compressing the protrusion prior to compressing the second portion of the tensile member.
2. The method recited in claim 1 , further including a step of forming the tensile member to include at least one cavity in the first portion of the tensile member and adjacent the protrusion.
3. The method recited in claim 1 , further including a step of forming the tensile member to include channels extending through the tensile member, at least one of the channels being in the first portion of the tensile member and adjacent the protrusion.
4. The method recited in claim 1 , further including steps of:
forming the tensile member from a thermoplastic polymer foam material;
selecting the polymer material of the first layer and the second layer to be a thermoplastic polymer material; and
forming direct bonds between the tensile member and each of the first layer and the second layer.
5. The method recited in claim 1 , wherein the step of placing and the step of locating are performed simultaneously.
6. The method recited in claim 1 , wherein the step of locating is performed prior to the step of placing.
7. The method recited in claim 1 , further including a step of incorporating the chamber into an article of footwear.
8. A method of manufacturing a fluid-filled chamber, the method comprising:
locating a thermoplastic polymer foam tensile member within a mold and between a first layer and a second layer of thermoplastic polymer material, a first surface of the tensile member being located adjacent to the first layer, and a second surface of the tensile member being located adjacent to the second layer, the tensile member defining a cavity located between the first surface and the second surface, the cavity extending entirely through the tensile member and in a direction that is substantially parallel to the first surface and the second surface, and the tensile member defining a protrusion positioned adjacent to the cavity;
compressing the tensile member, the first layer, and the second layer within the mold to directly bond (a) the first layer to the first surface of the tensile member, (b) the second layer to the second surface of the tensile member, and (c) the first layer and the second layer together around a periphery of the tensile member; and
incorporating the chamber into an article of footwear.
9. The method recited in claim 8 , further including a step of configuring the cavity to be a channel that extends through the tensile member.
10. The method recited in claim 8 , further including a step of forming at least one of the first surface and the second surface of the tensile member to have a contoured configuration.
11. The method recited in claim 8 , further including a step of heating at least one of the tensile member, the first layer, and the second layer.
12. The method recited in claim 8 , wherein the step of compressing includes having the mold compress the protrusion prior to compressing other portions of the tensile member
13. A method of manufacturing a fluid-filled chamber, the method comprising:
locating a tensile member within a mold and between a first layer and a second layer of polymer material, the tensile member having a first portion with greater compressibility than a second portion, the first portion being joined with the second portion and formed as a one-piece element, and the mold defining a void for forming the chamber, a surface of the tensile member having at least one protrusion extending outward from the first portion; and
compressing the tensile member, the first layer, and the second layer within the void, the protrusion being compressed prior to the second portion of the tensile member.
14. The method recited in claim 13 , further including a step of forming the tensile member to include at least one cavity in the first portion of the tensile member.
15. The method recited in claim 13 , further including a step of forming the tensile member to include channels extending through the tensile member, at least one of the channels being in the first portion of the tensile member.
16. The method recited in claim 13 , further including steps of:
forming the tensile member from a thermoplastic polymer foam material;
selecting the polymer material of the first layer and the second layer to be a thermoplastic polymer material; and
forming direct bonds between the tensile member and each of the first layer and the second layer.
17. The method recited in claim 13 , further including a step of incorporating the chamber into an article of footwear.
18. A method of manufacturing a fluid-filled chamber, the method comprising:
placing a thermoplastic polymer foam tensile member between a first layer and a second layer of thermoplastic polymer material, the tensile member having:
a first surface located adjacent to the first layer,
a second surface located adjacent to the second layer,
a side surface extending between the first surface and the second surface,
a plurality of cavities located between the first surface and the second surface, at least one of the cavities extending in a direction that is substantially parallel to the first surface and the second surface and extending through at least one area of the side surface, and
a plurality of protrusions extending outward from the first surface and the second surface in areas adjacent to the cavities; and
compressing the tensile member, the first layer, and the second layer with a mold such that:
the mold contacts the first layer to directly bond the first layer to the first surface of the tensile member, the mold compressing the protrusions prior to areas of the tensile member where the protrusions are absent,
the mold contacts the second layer to directly bond the second layer to the second surface of the tensile member, and
the first layer and the second layer are compressed together around a periphery of the tensile member to form a direct bond between the first layer and the second layer.
19. The method recited in claim 18 , further including a step of forming the cavities to be channels extending at least partially through the tensile member.
20. The method recited in claim 18 , further including a step of forming the cavities to be channels extending between sides of the tensile member.
21. The method recited in claim 18 , further including a step of forming the cavities to be channels extending entirely through the tensile member.
22. The method recited in claim 18 , further including a step of heating at least one of the tensile member, the first layer, and the second layer.
23. The method recited in claim 18 , further including a step of incorporating the chamber into an article of footwear.