Shoe, and method for producing shoe
A shoe including: an upper that includes a first layer made of knitted fabric and a second layer made of knitted fabric arranged inside the first layer, wherein at least one of the first layer and the second layer includes first yarns and second yarns as yarns for forming the knitted fabric, wherein the first yarns have a heat shrinkability, wherein the second yarns have a higher fusion point than that of the first yarns, and wherein the at least one of the first layer and the second layer including the first yarns and the second yarns has a higher heat shrinkage rate in a width direction than in a longitudinal direction.
1. A shoe comprising:
an upper that comprises a first layer made of a first knitted fabric and a second layer made of a second knitted fabric arranged inside the first layer,
wherein at least one of
the first layer comprises first yarns and second yarns which form the first knitted fabric, and
the second layer comprises the first yarns and the second yarns which form the second knitted fabric,
wherein
the first yarns and the second yarns have a heat shrinkability,
the second yarns have a higher fusion point than that of the first yarns,
the at least one of the first layer and the second layer comprising the first yarns and the second yarns has a higher heat shrinkage rate in a width direction than in a longitudinal direction, and
the first yarns have a heat shrinkability greater than the second yarns.
2. The shoe according to claim 1 , wherein
the first layer comprises the first yarns and the second yarns,
the second layer comprises the second yarns and is without the first yarns, and
the heat shrinkage rate of the first yarns is two times or more the heat shrinkage rate of the second yarns.
3. The shoe according to claim 1 , wherein
the first layer comprises the second yarns and is without the first yarns,
the second layer comprises the first yarns and the second yarns, and
the heat shrinkage rate of the first yarns is two times or more the heat shrinkage rate of the second yarns.
4. The shoe according to claim 1 , wherein
the first knitted fabric that forms the first layer is configured with first gaps opening through a surface of the first knitted fabric, and
a size of the first gaps is longer in the longitudinal direction of the upper than in the width direction of the upper.
5. The shoe according to claim 1 , wherein
the upper comprises a third layer arranged inside the second layer, and
the third layer has a higher shrinkability than the first layer and the second layer.
6. The shoe according to claim 1 , wherein
the upper comprises a body portion located on an upper side and a bottom portion continuous with a lower end of the body portion, and
the body portion comprises one of the first layer or the second layer comprising the first yarns and the second yarns in at least an instep region of a forefoot portion.
7. The shoe according to claim 1 , wherein
the upper comprises a body portion located on an upper side and a bottom portion continuous with a lower end of the body portion, and
the body portion comprises one of the first layer or the second layer comprising the first yarns and the second yarns in at least a part thereof.
8. A method for producing the shoe according to claim 1 , the method comprising:
joining the first layer and the second layer at least along outer edges of the first layer and the second layer to make an unshaped upper;
placing the unshaped upper on a last; and
heating the unshaped upper to conform the unshaped upper to a shape of the last to provide the shaped upper.
9. The method according to claim 8 , wherein
the heating is performed by steam heating.
10. The method according to claim 8 , wherein
the unshaped upper has a mesh structure formed of the knitted fabric included in the first layer and the second layer, and
a gap ratio of one of the first layer and the second layer comprising the first yarns and the second yarns is greater than a gap ratio of the other of the first layer and the second layer.
11. The method according to claim 8 , wherein
the unshaped upper comprises a body portion located on an upper side and a bottom portion continuous with a lower end of the body portion, and
the method further comprises removing the bottom portion after the heating.
12. The shoe according to claim 2 , wherein
the first knitted fabric that forms the first layer is configured with first gaps opening through a surface of the first knitted fabric, and
a size of the first gaps is longer in the longitudinal direction of the upper than in the width direction of the upper.
13. The shoe according to claim 3 ,
wherein
the first knitted fabric that forms the first layer is configured with first gaps opening through a surface of the first knitted fabric, and
a size of the first gaps is longer in the longitudinal direction of the upper than in the width direction of the upper.
14. The shoe according to claim 2 ,
wherein
the upper comprises a third layer arranged inside the second layer, and
the third layer has a higher shrinkability than the first layer and the second layer.
15. The shoe according to claim 3 ,
wherein
the upper comprises a third layer arranged inside the second layer, and
the third layer has a higher shrinkability than the first layer and the second layer.
16. The shoe according to claim 4 ,
wherein
the upper comprises a third layer arranged inside the second layer, and
the third layer has a higher shrinkability than the first layer and the second layer.
17. The shoe according to claim 2 ,
wherein
the upper comprises a body portion located on an upper side and a bottom portion continuous with a lower end of the body portion, and
the body portion comprises one of the first layer or the second layer comprising the first yarns and the second yarns in at least an instep region of a forefoot portion.
18. The shoe according to claim 3 ,
wherein
the upper comprises a body portion located on an upper side and a bottom portion continuous with a lower end of the body portion, and
the body portion comprises one of the first layer or the second layer comprising the first yarns and the second yarns in at least an instep region of a forefoot portion.
19. The shoe according to claim 4 ,
wherein
the upper comprises a body portion located on an upper side and a bottom portion continuous with a lower end of the body portion, and
the body portion comprises one of the first layer or the second layer comprising the first yarns and the second yarns in at least an instep region of a forefoot portion.