JP2021065684A - Shoe last, method for manufacturing shoe last and method for manufacturing shoe upper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recyclable last, a method for manufacturing the last, and a method for manufacturing a shoe upper.
SOLUTION: This is a last 1 for molding a shoe upper 2, and the last 1 has a fluidity that can change the form from a solid state having a certain form at the time of molding the shoe upper 2 at least with respect to an outer peripheral portion. It consists of a plastic material having a plastic state and a plastic material that changes reversibly with.
[Selection diagram] Fig. 4

Description

The present invention relates to a last for molding a shoe upper, a method for manufacturing the last, and a method for manufacturing the shoe upper.

When making a bespoke shoe that fits the user's foot, the last is for the user only, so use the last to mold the shoe upper and store it for the future after making the shoe. Except in some cases, the last is unnecessary.

U.S. Patent Application Publication No. 2018/0014609 discloses that footwear is manufactured in a portable housing. U.S. Patent Application Publication No. 2016/2006049 discloses a last preform that can be remolded with shape memory polymers. Chinese Patent No. 1097392913 discloses that the last is formed by 3D printing. U.S. Pat. No. 15,502,32 discloses a last containing pulp and paper inside.

U.S. Patent Application Publication No. 2018/0014609 U.S. Patent Application Publication No. 2016/2006049 Chinese Patent No. 1097392913 U.S. Pat. No. 15,502,32

However, there is no specific or explicit disclosure in each of the above documents regarding the recycling of the last that is no longer needed.

Therefore, an object of the present invention is to provide a recyclable last, a method for manufacturing the last, and a method for manufacturing a shoe upper.

The present invention is a last for molding a shoe upper, and the last is a solid state having a certain form at the time of molding the shoe upper and a plastic state having a fluidity capable of changing the form, at least for the outer peripheral portion. It is the last made of plastic material that changes reversibly with and.

Further, the present invention is a method for manufacturing a last for molding a shoe upper, in which the last is a stack of pulp aggregates in which a plurality of pulp materials are aggregated by 3D printing in the inward and outward directions with reference to the foot of the shoe wearer. It is a manufacturing method of the last formed by doing.

Regarding the last according to the embodiment of the present invention, it is shown that the user's foot is photographed in order to obtain the foot shape data. It is a perspective view which shows the said last. The state where the last was dissolved into a lysate is shown. The state in the middle of forming the last with a 3D printer is shown. It is a vertical cross-sectional view which shows the central part and the peripheral part of the last. It is a vertical cross-sectional view of a main part which shows the state which the outer circumference of the main body part of the last is covered with a protection part. It is a side view which shows the state which put the upper before molding on the last, and is steam heated inside the heating box. It is a perspective view which shows the state in the process of forming the molding die by cutting in the case of forming the last with a molding die. It is a perspective view which shows the said mold. It is a perspective view which shows the state in the process of forming the last with the molding die. It is a perspective view which shows the last which concerns on other embodiment of this invention. It is a perspective view which shows the last which concerns on other embodiment of this invention. It is a perspective view which shows the last which concerns on other embodiment of this invention. It is a perspective view which shows the last which concerns on other embodiment of this invention.

Embodiments of the present invention will be illustrated together with the drawings. In the following description, the "inward / outward direction" means "inward" toward the shoe wearer's foot and "outward" toward the outside of the shoe. Further, when the shoe upper 2 before and after molding is described below, it may also be referred to as a pre-molding upper 2A or a post-molding upper 2B for distinction.

The last (last) 1 of the present embodiment is not mainly the last for mass-produced shoes, but the last 1 made to order according to the user's foot F. However, the present invention does not completely deny the application of mass-produced products to the last for shoes, and can be applied. This last 1 can be manufactured in a store that handles shoes, or can be manufactured in a factory away from the store by transmitting and receiving 3D printing data and foot shape data by communication means as described later. The last 1 of the present embodiment is made of a plastic material at least for the outer peripheral portion (the portion that touches the shoe upper 2 at the time of molding the shoe upper 2). The "plastic material" referred to here is a solid state having a certain form at the time of molding the shoe upper 2, which is formed by covering the last 1 with the material of the shoe upper 2 (upper 2A before molding) and heating or the like. It is a material that changes reversibly between (see the form of the last 1 shown in FIG. 1B) and a plastic state having fluidity (see FIG. 1C) (excluding those that change irreversibly). The "fluidity" is a property of a liquid (or something similar to a liquid), and is a property in which the form (outer shape) can be freely changed. The shoe upper 2 is made of cloth, for example, and in the present embodiment, a cloth made of a heat-shrinkable fiber sheet is used.

The plastic material in the present embodiment includes a solid content aggregate in which a plurality of solid contents are aggregated, and a molding material which is mixed with the solid content aggregate and hardens the solid content aggregate so as to have the above-mentioned constant form. In this embodiment, a pulp material (individually smaller (fine) than the size of the entire last 1 and made into granular or fibrous pulp pieces) is used as the solid content. That is, the solid content aggregate is a pulp aggregate in this embodiment. With this configuration, the last 1 can be formed using pulpwood, which is a general paper material, so that the material can be easily obtained.

The molding material is such that the plastic material becomes fluid when it is melted from the solidified state. The dissolution is performed, for example, by adding a separate material (water in this embodiment) to the molding material, heating, and irradiating with light rays (ultraviolet rays, etc.). The material used as the molding material is a water-soluble material such as starch paste or a water-soluble resin, in which fluidity appears in the molding material when water is added. The molding material is, for example, a liquid in the initial state, and changes to a solid with time in contact with the pulp aggregate. Then, by dissolving the molding material after that, a liquid containing a solid pulp aggregate can be obtained. The use of a water-soluble molding material is advantageous in that a special chemical or device for dissolution is not required because the molding material can be dissolved in water to form a plastic state.

The mixing ratio of the pulp aggregate and the molding material is the hardness required when using the outer peripheral portion of the last 1 (before and after molding the shoe upper 2), the surface roughness of the last 1, and the air in the air during use. It can be determined in consideration of humidity, time required for dissolution, and the like.

In the last 1 configured as described above, after the shoe upper 2 is molded, it can be changed from the solid state to the plastic state, and then changed to the solid state again. And this change is reversible. Therefore, it can be recycled.

The last 1 is formed by laminating pulp aggregates in the inward and outward directions. The lamination may be multi-layered or single-layered. Since the last 1 can be formed by laminating, the last 1 can be formed without using a molding die. Therefore, for example, as shown in FIG. 2, molding by a 3D printer is possible.

Further, although the last 1 may be solid, it is desirable that the inside is hollow (see the partial cross section in FIG. 2). When it is hollow, the main body 11 containing the plastic material is formed so as to surround the hollow internal space 1a in the last 1. Even if it is hollow, there is no functional problem because the strength can be secured by setting the thickness of the main body 11. When the last 1 is hollow, the material does not have to be arranged in the center, so that the material can be saved. Moreover, the time required for forming the last 1 can be shortened. Moreover, since the weight of the last 1 can be reduced, the last 1 is easy to handle. As described above, there are various merits.

Further, the last 1 may include a central portion 12 and a peripheral portion 13 as shown in FIG. 3A. The central portion 12 is a portion that is formed in advance as the core material of the last 1 and is always in a solid state. The central portion 12 may be solid or hollow. If it is hollow, the weight of the last 1 can be reduced. The peripheral portion 13 is a portion formed on the outer peripheral portion of the central portion 12. The peripheral portion 13 is made of a plastic material. That is, in this configuration, the central portion 12 is located in the internal space 1a in the configuration. By configuring the last 1 in this way, the time required for forming the last 1 can be shortened as in the above configuration. Further, the amount of the plastic material used can be reduced as compared with the structure in which the entire last 1 is formed uniformly and solid. Further, when shoes are manufactured in a factory, by using the central portion 12 which is a core material, only the central portion 12 which is one size smaller than the last 1 is stored in the factory for a long period of time. Therefore, as compared with storing the entire last 1, the number of storages can be increased per predetermined space, and the storage space can be saved. Further, even in the last 1 having different sizes, the shape (size) of the central portion 12 can be unified, so that it is not necessary to store the last 1 according to the size.

When the last 1 includes the central portion 12, the central portion 12 can be formed of a material having a higher heat transfer property than the peripheral portion 13. For example, the central portion 12 can be made of metal (aluminum alloy or the like). With this configuration, when the shoe upper 2 is molded by heating (see FIG. 4), the central portion 12 of the last 1 is also heated, so that the shoe upper 2 can also be heated from the side of the central portion 12 (see FIG. 4). That is, the upper 2A before molding is heated from both inside and outside). Therefore, the heating time can be shortened as compared with the case of heating only from the outside, and the shoe upper 2 can be efficiently molded (in a short time).

Further, as shown in FIG. 3B, the last 1 may include the main body portion 11 and a layered or film-shaped protective portion 14 that covers the outer periphery (outer surface) of the main body portion 11. Here, as described above, the main body portion 11 is a portion surrounding the internal space 1a when the last 1 is hollow, the entire last 1 (excluding the protective portion 14) when the last 1 is solid, and the last 1 is the center. When the portion 12 and the peripheral portion 13 are provided, the peripheral portion 13 corresponds to the case (see FIG. 3A). With this configuration, the protective portion 14 can protect the main body portion 11 from being damaged. In addition, the protective portion 14 can impart heat resistance and ultraviolet resistance to the last 1. Further, the protective portion 14 can be made detachable from the main body portion 11. In order to enable peeling, for example, the protective portion 14 is bonded to the main body portion 11 using a peelable adhesive after bonding, or the protective portion 14 is formed of a material having weak adhesion to the main body portion 11. A protective portion 14 is formed. With this configuration, the protective portion 14 is peeled off from the last 1, so that the main body 11 can be easily recycled while protecting the main body 11 in the state of the last 1.

Examples of the protective portion 14 include a metal thin film (aluminum thin film and the like), an ultraviolet curable resin (epoxy resin and the like) that has been applied and cured, a silicone resin, and rubber. Further, it may be a layer made of fine particles (sand or the like) sprayed on the outer periphery of the main body 11. Further, the coating film formed by immersing the main body portion 11 in the liquid resin can be used as the protective portion 14. Further, the protective portion 14 can be formed by spraying a liquid resin onto the main body portion 11 in a spray form or applying the liquid resin with a brush, a roller, or the like.

Next, the manufacturing method of the last 1 will be described. The last 1 is formed by laminating a plastic material (a mixture of a pulp aggregate and a molding material) in the inward and outward directions by 3D printing. This formation is made hollow, for example, as shown in the partial cross section in FIG. Further, when the last 1 includes the central portion 12 and the peripheral portion 13, a portion to be the peripheral portion 13 is laminated on the outer periphery of the central portion 12 (see FIG. 3A). By using the 3D printing method, the last 1 can be easily formed without using a molding die. 3D printing is performed using a 3D printer equipped with a nozzle N as shown in FIG. The plasticized mixture is discharged from the nozzle N, and is formed so as to be sequentially stacked from the bottom to the top as shown in the figure. FIG. 2 shows the last 1b during molding.

When the last 1 is formed by 3D printing, the entire last 1 can be formed at a uniform rate with respect to the forming speed of the last 1b during molding. For example, in order to shorten the molding time, the user in the upper 2B after molding. It is also possible to precisely mold the instep portion in the last 1 at a slow speed and roughly mold the other portion at a high speed, which greatly affects the wearing feeling of the. Further, the outer layer touched by the shoe upper 2 at the time of molding can be precisely molded at a slow speed, and the inner layer can be roughly molded at a high speed. It is also possible to mold the outer layer with a higher density and the inner layer with a lower density.

As a pre-stage for forming the last 1, a data acquisition step of acquiring the user's foot print data and a data generation step of generating 3D printing data from the acquired user's foot print data are carried out. Then, the last forming step of laminating the pulp aggregate is carried out based on the generated 3D printing data. By going through these steps, it is possible to form a custom-made last 1 that matches the user's foot F.

The 3D printing data is created based on the foot type data of the user, which is individually generated for each of the plurality of users. By creating the 3D printing data in this way, it is possible to finely customize the shoe upper 2 for each user.

The user's foot type data is, for example, measurement data of each part of the user's foot F generated from image data obtained by photographing the user's foot F as shown in FIG. 1A. Therefore, for example, a digital camera or a smartphone P (see FIG. 1A) can be used to easily generate foot type data. For example, in the case of the smartphone P, the foot type data can be generated based on the image data by the software installed in advance. It is also possible to create foot shape data by performing calculations using both the captured image data and the data in the server owned by the shoe maker.

The image data can be taken, for example, at the user's home or a store (sales store) visited by the user. In this case, the image data can be transmitted to the shoe maker's server, the foot shape data can be generated at the shoe maker's factory, and the last 1 and shoes can be subsequently manufactured at this factory. It is also possible to take the image data at a store and manufacture the last 1 and shoes as they are at this store. Of course, Last 1 and shoes can be manufactured in separate locations. Further, the store is not limited to a fixed store, and may be a mobile store using an automobile or a trailer.

After the last 1 is used for molding the shoe upper 2 and is no longer needed, the melting step is carried out. In the dissolution step, the last 1 after use is dissolved and fluidized to obtain a melt 1F (see FIG. 1C). FIG. 1C shows a state in which the solution 1F is placed in a container. The shape of the container that holds the solution 1F is not particularly limited. The melt 1F is adjusted to have sufficient fluidity to be discharged to the outside through the nozzle N of the 3D printer. When the last 1 contains a water-soluble molding material, water is added to the last 1 after use (after molding the shoe upper 2) to fluidize it. In this case, the solution 1F is a state in which the pulp material as a dispersoid is dispersed in water as a dispersion medium. Further, a molding material (starch paste or the like) is dissolved in the water constituting the melt 1F. If necessary, a molding material is additionally melted in the melt 1F. Further, an effect accelerator that accelerates curing after being discharged from the nozzle N can be added to the solution 1F. Further, since the pulp material does not precipitate in the container, it is possible to add a chemical to the solution 1F or stir the solution 1F in the container. By carrying out the dissolution step in this way, the solid content aggregate (pulp aggregate) can be returned to the plastic state, and 3D printing can be performed using this. Therefore, the last 1 after use can be recycled as the last 1 for other users.

Since the melting step is performed in a short time, hot water can be added to the last 1 after use. Further, at the time of molding the last 1, a particle line (dividing line) can be formed in the last 1 in advance. Further, before or after adding water or hot water, mechanical means such as a cutting device (shredder or the like) or a device for loosening the tissue of the last 1 can be used to promote dissolution with water or hot water.

Next, a method of manufacturing the shoe upper 2 using the last 1 will be briefly described. For example, a material for the shoe upper 2 (upper 2A before molding) made of a fiber sheet containing a heat-shrinkable yarn is prepared. Then, the pre-molding upper 2A is placed on the last 1 in the first molding step, and as shown in FIG. 4, the pre-molding upper 2A is formed into the post-molding upper 2B along the shape of the last 1 by heating. Carry out the molding process. The heating means used in the second molding step is steam heating. As shown in FIG. 4, for example, the pre-molding upper 2A is housed inside the heating box 31, and is heated by the high-temperature steam 32 released from the inner surface of the heating box 31. By this steam heating, the entire upper 2A before molding can be uniformly heated. Therefore, the pre-molded upper 2A can be uniformly deformed according to the last 1 to form the post-molded upper 2B. In the second molding step, hot air heating, hot water heating, and the like can be used in addition to steam heating. It is also possible to heat the upper 2A before molding not entirely but partially.

After the second molding step, the sole mounting step is carried out. In this sole attachment step, the upper 2B is attached to a separately produced sole after molding, for example, by adhesion. In addition to bonding, the sole mounting step can be performed at the same time as the second molding step by heat fusion or the like. In this case, if the central portion 12 of the last 1 is formed of a material having high heat conductivity (for example, a metal such as aluminum, copper, stainless steel), heat welding can be efficiently performed. In addition, the formation of the tongue, the processing of the opening, the attachment of eyelets for passing the shoelace (shoelace), the attachment of decorative members and tags, the logo printing, the attachment of the insole (insole) are performed during each of the above steps, or It can be performed as appropriate after the completion of all steps.

Here, the configuration and the action to be performed according to the embodiment of the present invention will be summarized. The present embodiment is the last 1 for molding the shoe upper 2, and the last 1 is a flow that can change the form from a solid state having a certain form at the time of molding the shoe upper 2 at least with respect to the outer peripheral portion. It is the last 1 composed of a plastic material having a property and a plastic material that changes reversibly with.

According to this configuration, after the shoe upper 2 is molded, it can be changed from the solid state to the plastic state and then changed to the solid state again, so that it can be recycled.

Further, the plastic material includes a pulp aggregate in which a plurality of pulp materials are aggregated and a molding material for solidifying the pulp aggregate into the fixed form, and the molding material is melted from the solidified state. The plastic material may have fluidity.

According to this configuration, since pulpwood, which is a general paper material, can be used, the material can be easily obtained.

Further, the molding material can be water-soluble.

According to this configuration, the molding material can be dissolved with water, so that no special chemical or device for dissolution is required.

Further, the last 1 can be formed by laminating the pulp aggregates in the inward and outward directions with respect to the foot of the shoe wearer.

According to this configuration, the last 1 can be formed by laminating without using a molding die, so that molding by, for example, a 3D printer is possible.

Further, the last 1 can be hollow inside.

According to this configuration, the material does not have to be placed in the center, so that the material can be saved.

Further, the last 1 includes a central portion 12 formed in advance as a core material and always in a solid state, and a peripheral portion 13 made of the plastic material formed on the outer peripheral portion of the central portion 12. Can be done.

According to this configuration, the time required for forming the last 1 can be shortened. In addition, the amount of the plastic material used can be reduced as compared with the structure in which the whole is uniformly formed.

Further, the central portion 12 may be made of a material having a higher heat transfer property than the peripheral portion 13.

According to this configuration, when the shoe upper 2 is molded by heating, the shoe upper 2 can be heated from the side of the central portion 12, so that the shoe upper 2 can be molded efficiently.

Further, the last 1 may include a main body portion 11 containing the plastic material and a protective portion 14 that covers the outer periphery of the main body portion 11.

According to this configuration, the main body portion 11 can be protected by the protection portion 14.

Further, the protective portion 14 may be detachable from the main body portion 11.

According to this configuration, by peeling the protective portion 14 from the last 1, the main body portion 11 can be easily recycled.

Further, the present embodiment is a method for manufacturing the last 1 for molding the shoe upper 2.
The last 1 is a method for producing the last 1 which is formed by laminating a pulp aggregate in which a plurality of pulp materials are aggregated by 3D printing in the inward and outward directions with reference to the foot of the shoe wearer.

According to the manufacturing method configured in this way, the last 1 can be easily formed without using a molding die.

Further, the last 1 can be formed in a hollow shape by 3D printing.

According to the manufacturing method configured in this way, the formation time of the last 1 can be shortened. Also, the material can be saved.

Further, the last 1 includes a central portion 12 formed in advance as a core material and a peripheral portion 13 formed on the outer peripheral portion of the central portion 12, and the portion formed by the 3D printing is the peripheral portion. It can be the part 13.

According to the manufacturing method configured in this way, the time required for forming the last 1 can be shortened. In addition, the amount of the plastic material used can be reduced as compared with the structure in which the whole is uniformly formed.

Further, a data acquisition step of acquiring the user's foot print data, a data generation step of generating 3D print data from the user's foot print data, and a last formation in which the pulp aggregates are laminated based on the 3D print data. It can be equipped with a process.

According to the manufacturing method configured in this way, the last 1 can be formed according to the user's foot.

Further, the 3D printing data can be created based on the foot type data of the user individually generated for each of the plurality of users.

According to the manufacturing method configured in this way, the shoe upper 2 can be customized for each user.

Further, the user's foot type data can be generated from image data obtained by photographing the user's foot.

According to the manufacturing method configured in this way, foot type data can be easily generated by using, for example, a digital camera or a smartphone.

Further, the last 1 may include a water-soluble molding material that hardens the pulp aggregate so as to have a certain form, and may further include a dissolution step of adding water to the last 1 after use to fluidize the pulp aggregate. ..

According to the manufacturing method configured in this way, the last 1 after use can be recycled as the last 1 for other users.

Further, the embodiment is a method for manufacturing a shoe upper 2, wherein a pre-molding upper 2A made of a fiber sheet containing a heat-shrinkable yarn is placed on the last 1 in a first molding step, and the pre-molding upper 2A is heated by heating. Is a method for manufacturing a shoe upper 2, comprising a second molding step of forming the upper 2B after molding according to the shape of the last 1.

According to the manufacturing method configured in this way, the shoe upper 2 can be manufactured by the recyclable last 1.

Although the present invention has been described by taking up embodiments, this description is merely an example. The last 1, the manufacturing method of the last 1, and the manufacturing method of the shoe upper 2 according to the present invention are not limited to the above-described embodiment. Therefore, the last 1, the manufacturing method of the last 1, and the manufacturing method of the shoe upper 2 according to the present invention can be variously changed without departing from the gist of the present invention. The modification includes, for example, partial replacement or partial omission of a plurality of elements constituting the embodiment, and appropriate combination of elements belonging to different examples. It also includes combining items belonging to common general technical knowledge regarding the manufacturing method of the last 1, the last 1, and the manufacturing method of the shoe upper 2.

For example, the plastic material may be a resin. When a thermoplastic resin is used as the resin, it can be made into a plastic state by heating and can be made into a solid state by cooling.

Further, in the above-described embodiment, pulpwood is used as the solid content, but the present invention is not limited to this. For example, wood pieces (wood chips, etc.), bamboo pieces, natural fiber pieces (thread scraps, cut pieces of plant fibers, etc.), resin pieces (preferably heat-resistant resin pieces), metal pieces, paper pieces (larger than pulpwood). Paper pieces), cloth pieces, plant pieces (cut pieces of dead grass, etc.), sand, soil, and mud can also be used.

Further, the molding material may be a material that is dissolved by a solvent other than heat or water.

Further, in the above-described embodiment, the method of laminating the last 1 itself by 3D printing has been described. For example, the molding die 4 shown in FIG. 5B is created based on the foot mold data, and the plastic material is poured into the molding die 4. As a result, the last 1 may be formed. The molding die 4 can also be formed by 3D printing.

In this case, as shown in FIG. 5B, the molding die 4 has a first molding die 4a in which the recess 41 is formed corresponding to one side (for example, the right side) in the width direction of the last 1, and the recess 41 is formed in the other side in the width direction of the last 1. It can be combined with the second molding die 4b formed corresponding to the side (for example, the left side).

First, as shown in FIG. 5A, recesses 41 are formed in each of the first molding die 4a and the second molding die 4b by using, for example, a cutting tool C in order to match the shape of the last 1 to be formed. A small recess may be formed in advance in the molding die 4 before cutting. In this case, the size of the recess formed in advance may be a size corresponding to the standard shape of the last 1. By doing so, the additional machining using the cutting tool C or the like can be minimized. The completed molding die 4 has the form shown in FIG. 5B. By pouring a plastic material into the recess 41 of the molding die 4, the last 1 is formed as shown in FIG. 5C.

Regarding the pouring of the plastic material into the molding die 4, the pattern is such that the last constituents (a pair on the left and right) formed by pouring the plastic material into each of the first molding die 4a and the second molding die 4b are joined later. Alternatively, a pattern may be formed in which a plastic material is poured after joining the first molding die 4a and the second molding die 4b to form the last 1.

The molding die 4 is also made of a plastic material like the last 1, so that the used molding die 4 is melted and reused for the molding die 4 for forming the last 1 having a different shape. Can be done.

Further, the last 1 may be in the form of a combination of a plurality of lumps made of a plastic material such as beads 5 and 6 as shown in FIGS. 6 to 9 and smaller than the last 1. The last 1 shown in FIG. 6 is composed of a plurality of spherical beads 5. Each bead 5 is made of, for example, polyvinyl alcohol. By sprinkling water on the plurality of beads 5 arranged in the shape of the last 1 by fitting them into a mold or the like, the beads 5 that are in contact with each other can be adhered to each other. The last 1 can be formed by this adhesion. The last 1 after use can be dissolved by adding water or heating.

Further, the last 1 shown in FIGS. 7 and 8 is composed of a plurality of columnar beads 6. By heating the plurality of beads 6 arranged in the shape of the last 1 by fitting them into a mold or the like, the beads 6 that are in contact with each other can be adhered to each other. The last 1 can be formed by this adhesion. The last 1 after use can be melted by heating. The columnar beads 6 can be arranged so that the axial direction faces the vertical direction as shown in FIG. 7, or the columnar beads 6 can be arranged so that the axial direction faces the horizontal direction as shown in FIG. Further, as shown in FIG. 9, the rear portion of the last 1 is formed as an integrated portion 7 formed by laminating plastic materials by 3D printing as in the above embodiment, and a plurality of beads 6 are assembled at the front portion. It may be the part that has been used. Further, although not shown, only the rear portion may be a portion where a plurality of beads 6 are assembled.

Further, the last 1 may be formed in the same shape as the user's foot F as a whole, but for design and functional reasons, the user's foot F may be formed by a desired size for a specific part. The shape may be different from the shape.

Further, the method of manufacturing the shoe upper 2 is not limited to the method of heat-shrinking the fiber sheet containing the heat-shrinkable yarn as in the above embodiment, and for example, the fabric is woven around the last 1. Various methods can be adopted, such as laminating materials using a 3D printer.

1 Last 11 Main body 12 Central part 13 Peripheral part 14 Protective part 1a Internal space 1b Last during molding 1F Dissolve 2 Shoe upper 2A Pre-molding upper 2B Post-molding upper 31 Heating box 32 Steam F User's foot P Smartphone N Nozzle

Claims (17)

It is the last for molding the shoe upper,
The last is made of a plastic material that reversibly changes at least the outer peripheral portion between a solid state having a certain form at the time of molding the shoe upper and a plastic state having a fluidity that can change the form. The plastic material includes a pulp aggregate in which a plurality of pulp materials are aggregated, and a molding material for solidifying the pulp aggregate into the fixed form.
The last according to claim 1, wherein the molded material is melted from a solidified state to cause fluidity in the plastic material. The last according to claim 2, wherein the molding material is water-soluble. The last according to claim 2 or 3, wherein the pulp aggregate is formed by being laminated in the inward and outward directions with respect to the foot of the shoe wearer. The last according to any one of claims 1 to 4, wherein the last is hollow inside. Claims 1 to 4, wherein the last includes a central portion that is formed in advance as a core material and is always in a solid state, and a peripheral portion made of the plastic material formed on the outer peripheral portion of the central portion. The last described in either. The last according to claim 6, wherein the central portion is formed of a material having a higher heat transfer property than the peripheral portion. The last according to any one of claims 1 to 7, wherein the last includes a main body portion containing the plastic material and a protective portion that covers the outer periphery of the main body portion. The last according to claim 8, wherein the protective portion can be peeled off from the main body portion. It is the last manufacturing method for molding the shoe upper,
The last is a method for producing a last, which is formed by laminating a pulp aggregate in which a plurality of pulp materials are aggregated by 3D printing in the inward and outward directions with reference to the foot of a shoe wearer. The method for producing a last according to claim 10, wherein the last is formed in a hollow shape by 3D printing. The last portion includes a central portion formed in advance as a core material and a peripheral portion formed on an outer peripheral portion of the central portion, and the portion formed by the 3D printing is the peripheral portion. The last manufacturing method according to 10. A data acquisition step of acquiring user's foot print data, a data generation step of generating 3D print data from the user's foot print data, and a last forming step of laminating the pulp aggregate based on the 3D print data. The method for producing the last according to any one of claims 10 to 12, further comprising. The last manufacturing method according to claim 13, wherein the 3D printing data is created based on the foot shape data of the users individually generated for each of the plurality of users. The last manufacturing method according to claim 14, wherein the user's foot shape data is generated from image data obtained by photographing the user's foot. The last comprises a water-soluble molding material that hardens the pulp aggregate into a constant form.
The method for producing a last according to any one of claims 10 to 15, further comprising a dissolution step of adding water to the last after use to fluidize the last. It ’s a method of manufacturing shoe uppers.
The first molding step of covering the last according to any one of claims 1 to 9 with a pre-molding upper made of a fiber sheet containing a heat-shrinkable yarn, and molding the pre-molding upper along the shape of the last by heating. A method for manufacturing a shoe upper, comprising a second molding step as a rear upper.

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