JP6484010B2 - Shoe sole manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a shoe sole in which a rubber outsole and a polyurethane midsole are integrated.

  Polyurethane is widely used as a material for shoe soles because it is lightweight and has excellent cushioning and wear resistance. However, polyurethane soles generally have a drawback that they are inferior in slip resistance as compared to rubber soles. For this reason, a hybrid shoe sole that combines rubber's slip resistance with polyurethane's light weight and cushioning properties has been developed by bonding a rubber outsole to a polyurethane midsole. It has been adopted in various shoes such as work shoes and sports shoes. However, since rubber and polyurethane have low compatibility, it is not always easy to bond the rubber outsole and the polyurethane midsole with high adhesive strength.

  In view of such a situation, until now, after setting a rubber outsole in which a cloth such as a nonwoven fabric is integrally fixed on the upper surface in a mold for molding a midsole, A method of manufacturing a shoe sole in which a rubber outsole and a polyurethane midsole are integrated by injecting polyurethane for sole molding has also been proposed (see, for example, Patent Document 1 and Patent Document 2). ). In this shoe sole manufacturing method, since the polyurethane injected into the mold is impregnated into the fabric, even the rubber outsole is firmly integrated with the polyurethane midsole. It is possible.

  However, the shoe sole manufactured by the above manufacturing method has a problem that defective products are likely to occur. This is because, in the above manufacturing method, the outsole to which the fabric is fixed is formed by injecting unvulcanized rubber for outsole molding into an outsole molding die and laying the fabric on the upper surface thereof. Since the rubber was vulcanized by heating the mold while pressing the material, the outsole after vulcanization was warped due to the difference in thermal shrinkage between the rubber and the fabric. This is because the warp (usually the center portion of the outsole is convex on the fabric side) was likely to occur. When the warped outsole is set in a mold for molding a midsole, an unintended gap is formed between the outsole and the mold, so polyurethane injected into the mold enters the gap. Or the outsole may be displaced by polyurethane injected into the mold.

Japanese Patent Laid-Open No. 06-113902 JP 2004-337193 A

  The present invention has been made to solve the above-mentioned problems, and not only can a rubber outsole and a polyurethane midsole be integrated with high adhesive strength, but also the occurrence of defective products can be suppressed. A method for manufacturing a sole is provided.

The above issues
An outsole molding step of molding an outsole composed of a vulcanized rubber layer having a non-slip design applied to the lower surface and a fabric layer integrally fixed to the upper surface of the vulcanized rubber layer;
An outsole setting step in which the outsole molded in the outsole molding step is set on the inner bottom of the mold with the lower surface facing the inner bottom surface of the mold;
A midsole molding process in which polyurethane for midsole molding is injected into the mold after the outsole setting process and cured,
A shoe sole manufacturing method for manufacturing a shoe sole in which an outsole and a midsole are integrated via the fabric layer,
A method for manufacturing a shoe sole, wherein, in the outsole setting step, by using a connecting shaft member that connects the outsole and the mold, the outsole is fixed to the inner bottom surface of the mold while being pressed. It is solved by providing.

  As a result, even if the outsole formed in the outsole molding process is warped, the outsole is forcibly pressed in the outsole setting process so that there is no warp. It is possible to prevent an unintended gap from being formed between the two. For this reason, it is possible to prevent the polyurethane injected into the mold in the midsole molding process from entering the gap and the outsole from being displaced by the polyurethane.

  In the outsole setting step, there is no particular limitation as to how the outsole is fixed in a state of being pressed against the inner surface of the mold, but the following two methods are preferable. First, in the outsole molding process, a through hole that penetrates the outsole in the thickness direction is provided, and in the outsole setting process, a connecting shaft member is inserted into the through hole from the upper surface side of the outsole, for connection. In the method of press-fitting the tip end portion of the shaft member into the press-fitting hole formed in the inner bottom surface of the mold, or in the outsole molding process, the connecting shaft member (projection portion) is connected to the lower surface portion of the outsole (the vulcanized rubber layer). In the outsole setting step, the connecting shaft member (protrusion) is press-fitted into a press-fitting hole formed in the inner bottom surface of the mold. Second, in the outsole molding process, a press-fitting hole is provided on the lower surface of the outsole, and in the outsole setting process, the tip of the connecting shaft member that protrudes from the inner bottom surface of the mold into the mold is formed on the outsole. In this method, the outsole is fixed to the inner bottom surface of the mold while being pressed into the press-fitting hole from the lower surface side.

  In this way, the outsole in the outsole setting process is achieved by press-fitting the distal end portion of the connecting shaft member into the press-fitting hole provided on the inner bottom surface of the mold or the press-fitting hole provided on the lower surface of the outsole. Can be easily connected to the mold. Further, after the midsole molding process is finished, if the shoe sole is pulled from the mold, the portion of the connecting shaft member that is press-fitted into the press-fitting hole is naturally removed, so that the shoe sole can be easily released.

  In the shoe sole manufacturing method of the present invention, the connecting shaft member may be formed of a hard material such as metal, hard resin, or wood, but is formed of an elastic material and is connected to the tip of the connecting shaft member. It is preferable to use a portion in which a portion having a larger diameter than the press-fitting hole is formed. As a result, the outsole is pressed against the inner bottom surface of the mold until the midsole molding process is completed after the outsole setting process, while allowing the connecting shaft member to be easily press-fitted or pulled out from the press-fitting hole. It is possible to maintain a steady state. In addition, since the elastic material is easier to cut with a cutter or scissors than a hard material such as metal, in the connecting shaft member cutting step to be described later, it is easy to cut off the excess portion of the connecting shaft member. Can do.

  In the shoe sole manufacturing method of the present invention, the connecting shaft member may be completely removed from the completed shoe sole, but the connecting shaft member remains in the completed shoe sole (the connecting shaft). It is also possible to bury the member in the sole). This is because the connecting shaft member left in the completed shoe sole can be used as a spike, a slip sign or the like. When leaving the connecting shaft member in the completed shoe sole, after the midsole molding process is finished, a connecting shaft member cutting step is performed to cut out a portion protruding from the lower surface of the outsole in the connecting shaft member. Good.

  As described above, according to the present invention, there is provided a method for manufacturing a shoe sole that not only integrates a rubber outsole and a polyurethane midsole with high adhesive strength but also can suppress the occurrence of defective products. It becomes possible to do.

It is the perspective view which showed the outsole shape | molded at the outsole shaping | molding process in the manufacturing method of the shoe sole of the 1st embodiment which concerns on this invention. In the shoe sole manufacturing method according to the first embodiment of the present invention, in the outsole setting step, the state in which the outsole is set on the inner bottom of the mold is cut along a plane perpendicular to the front-rear direction. is there. In the shoe sole manufacturing method according to the first embodiment of the present invention, the state in which the outsole is pressed against the inner bottom surface of the mold using the connecting shaft member in the outsole setting step is a plane perpendicular to the front-rear direction. It is sectional drawing cut | disconnected and shown. In the shoe sole manufacturing method according to the first embodiment of the present invention, the state in which the outsole is pressed against the inner bottom surface of the mold using the connecting shaft member in the outsole setting step is a plane perpendicular to the left-right direction. It is sectional drawing cut | disconnected and shown. In the shoe sole manufacturing method according to the first embodiment of the present invention, it is a cross-sectional view showing a state in which polyurethane is injected into a mold in a midsole molding step, cut along a plane perpendicular to the left-right direction. . In the method for manufacturing a shoe sole according to the first embodiment of the present invention, a cross-section showing a state in which the shoe sole (shoe) after the midsole molding process has been taken out of a mold is cut along a plane perpendicular to the left-right direction. FIG. In the shoe sole manufacturing method according to the first embodiment of the present invention, the shoe sole (shoe) after the connecting shaft member cutting step is cut along a plane perpendicular to the left-right direction. In the shoe sole manufacturing method according to the second embodiment of the present invention, the state in which the outsole is pressed against the inner bottom surface of the mold using the connecting shaft member in the outsole setting step is a plane perpendicular to the front-rear direction. It is sectional drawing cut | disconnected and shown. In the shoe sole manufacturing method according to the third embodiment of the present invention, the state in which the outsole is pressed against the inner bottom surface of the mold using the connecting shaft member in the outsole setting step is a plane perpendicular to the front-rear direction. It is sectional drawing cut | disconnected and shown.

  A preferred embodiment of a shoe sole according to the present invention will be described more specifically with reference to the drawings. In the following, the method for producing a shoe sole according to the present invention will be described by taking three embodiments (first embodiment, second embodiment and third embodiment) as examples, but the technical scope of the present invention is as follows. The present invention is not limited to these embodiments, and modifications can be made as appropriate without departing from the spirit of the present invention.

1. Manufacturing method of sole according to the first embodiment The manufacturing method of the sole according to the first embodiment includes an outsole molding step, an outsole setting step, a midsole molding step, and a connecting shaft member cutting step. Thus, a shoe sole (more precisely, a shoe in which the shoe sole is integrated with the lower surface of the shoe main body) is manufactured. Hereinafter, each step will be described in detail.

1.1 Outsole Molding Step FIG. 1 is a perspective view showing an outsole 10 molded in the outsole molding step in the shoe sole manufacturing method of the first embodiment. As shown in FIG. 1, the outsole molding process includes a vulcanized rubber layer 11 having an anti-slip design applied to the lower surface, and a fabric layer 12 that is integrally fixed to the upper surface of the vulcanized rubber layer 11. It becomes the process of shape | molding the outsole 10 which becomes. In the outsole 10 molded in the outsole molding process, warping (see FIG. 2) due to the difference in thermal shrinkage between the vulcanized rubber layer 11 and the fabric layer 12 occurs (see FIG. 1 for convenience of illustration). Does not express this warpage.

  The specific procedure of the outsole molding process is not particularly limited. In the first embodiment, [1] unvulcanized rubber is injected into an outsole molding die, a cloth is laid on the upper surface, and [2] an outsole molding die while pressing these materials. Is heated to form the vulcanized rubber, thereby forming a sheet in which the vulcanized rubber layer 11 and the fabric layer 12 are integrated. [3] The sheet is then determined with a die cutter or the like. The outsole 10 is formed through a process of cutting into a shape. When the outsole 10 is cut in the step [3], a through hole 10a that penetrates the outsole 10 in the thickness direction is provided. A shaft portion 21 of a connecting shaft portion 20 to be described later is inserted into the through hole 10a.

  The rubber material used for molding the vulcanized rubber layer 11 is not particularly limited. Rubber materials used for molding the vulcanized rubber layer 11 include styrene-butadiene rubber (SBR), isoprene rubber (IR), butadiene rubber (BR), chloroprene rubber (CR), acrylonitrile-butadiene rubber (NBR), butyl rubber ( In addition to synthetic rubbers such as isobutylene / isoprene rubber (IIR)), ethylene / propylene / diene rubber (EPDM), urethane rubber (U) or fluororubber (FKM), natural rubber (NR) can also be used. The vulcanized rubber layer 11 may be formed by blending a plurality of types of rubber materials. The vulcanized rubber layer 11 may have a single layer structure or a multilayer structure. In the first embodiment, the vulcanized rubber layer 11 is composed of a lower layer 11a made of acrylonitrile-butadiene rubber (NBR) and an upper layer 11b made of acrylonitrile-butadiene rubber (NBR) mixed with a polyester fiber of about 20 mm. doing. Thus, by providing the upper layer 11b made of a rubber material mixed with long fibers on the lower side of the fabric layer 12, it is possible to reduce the warp generated in the outsole 10 after molding.

  The thickness of the vulcanized rubber layer 11 is not particularly limited, but is usually about 2 to 8 mm. In the first embodiment, the thickness of the vulcanized rubber layer 11 is 5 mm. Moreover, when providing the upper layer 11b which consists of a rubber material which mixed the long fiber like 1st embodiment, when the upper layer 11b is made thin too much, there exists a possibility that the suppression effect of the curvature of the outsole 10 may reduce. On the other hand, if the upper layer 11b is too thick, the lower layer 11a becomes thin, and there is a possibility that predetermined mechanical rubber properties cannot be obtained. For this reason, the thickness of the upper layer 11b is normally set to 2 to 3 mm. In the first embodiment, the thickness of the upper layer 11b is 2.5 mm.

  The type of the fabric used for the fabric layer 12 is not particularly limited as long as the polyurethane used for molding the midsole 40 described later can penetrate, and various fabrics such as a nonwoven fabric, a woven fabric, a knitted fabric, and a woven fabric are used. be able to. In addition, as fibers used in these fabrics, synthetic fibers such as polyamide, vinylon, polyvinyl chloride, polyester, acrylic, polyethylene, polypropylene or polyurethane, semi-synthetic fibers such as acetate, and regenerated fibers such as viscose rayon In addition, various kinds of fibers such as natural fibers such as cotton or hemp can be used. The fabric layer 12 may be formed of a plurality of types of fibers. The fabric layer 12 may have a single layer structure or a multilayer structure. In the first embodiment, the fabric layer 12 is formed of a nonwoven fabric made of polyester fibers.

  The thickness of the fabric layer 12 is not particularly limited, but if it is too thin, rubber flows into the fabric layer 12 at the time of vulcanization molding, so that there is less room for the polyurethane used for molding the midsole 40 to penetrate and the outsole 10 and mid There exists a possibility that the adhesive strength with the sole 40 may fall. For this reason, the thickness of the fabric layer 12 is usually 0.1 mm or more when measured in a pressurized state. The thickness of the fabric layer 12 is preferably 0.2 mm or more, and more preferably 0.3 mm or more. On the other hand, if the fabric layer 12 becomes too thick, the nonwoven fabric may cause delamination. For this reason, the thickness of the fabric layer 12 is normally 5 mm or less. The thickness of the fabric layer 12 is preferably 4 mm or less, and more preferably 3 mm or less. In the first embodiment, the thickness of the fabric layer 12 is 1 mm.

  By the way, in the first embodiment, as shown in FIG. 7, the outsole 10 includes a heel outsole 10 h that forms a heel side grounding portion, and a toe outsole 10 t that forms a toe side grounding portion. It has a separate structure. For this reason, in the outsole molding step, two types of outsole 10 are formed, that is, a heel outsole 10h and a toe outsole 10t. However, the structure of the outsole 10 is not limited to this. The outsole 10 may have a single-sheet structure in which the outsole 10h for the heel and the outsole 10t for the toe are continuous, or may be a structure separated into three or more parts.

  In the first embodiment, as shown in FIG. 1, both the heel outsole 10h and the toe outsole 10t are formed in a semi-elliptical shape in plan view. However, the shape of the outsole 10 is not limited to this, and other shapes such as a circular shape and a polygonal shape can also be adopted. Furthermore, in the first embodiment, as shown in FIG. 2, the anti-slip design formed on the lower surface of the vulcanized rubber layer 11 is a projection having a rectangular cross section. However, the form of the design is not limited to this, and other forms such as a trapezoidal cross section and a triangular cross section can be adopted. The design may be that obtained by roughening the lower surface of the vulcanized rubber layer 11. Furthermore, in the first embodiment, as shown in FIG. 1, through holes 10a are provided at two front and rear positions for each of the heel outsole 10h and the toe outsole 10t. However, the number and arrangement of the through holes 10a are not limited to this, and can be appropriately changed. The specific structure or the like of the outsole 10 is appropriately determined according to the use of the shoe.

  When the outsole molding process is finished, an outsole setting process is subsequently performed.

1.2 Outsole Setting Process FIG. 2 shows a state in which the outsole 10 is set on the inner bottom of the mold 50 in the outsole setting process in the shoe sole manufacturing method according to the first embodiment. It is sectional drawing cut | disconnected and shown by the plane perpendicular | vertical to the front-back direction. 3 and 4 show a state in which the outsole 10 is pressed against the inner bottom surface of the mold 50 by using the connecting shaft member 20 in the outsole setting step in the shoe sole manufacturing method according to the first embodiment. FIG. 3 is a cross-sectional view taken along a plane perpendicular to the front-rear direction, and a cross-section taken along a plane perpendicular to the left-right direction (the left-right direction of the shoe sole; the same applies hereinafter). FIG. As shown in FIGS. 3 and 4, the outsole setting step is performed as shown in FIGS. 3 and 4 after setting the outsole 10 molded in the outsole molding step to the inner bottom portion of the mold 50 for molding the midsole. In this process, the outsole 10 is fixed to the inner bottom surface of the mold 50 by using the connecting shaft member 20. Hereinafter, a specific procedure of the outsole setting process in the shoe sole manufacturing method of the first embodiment will be described in detail.

First, as shown in FIG. 4, the heel side outsole 10 h is set in the rear region (the region forming the heel side grounding portion in the shoe sole) in the inner bottom portion of the mold 50, and the inner bottom portion of the mold 50 is set. The toe-side outsole 10t is set in the front region (region where the toe-side grounding portion of the shoe sole is formed). Each outsole 10 is set in such a direction that the lower surface on which the design for preventing slipping is applied is the inner bottom surface side of the mold 50 (the direction in which the fabric layer 12 is on the upper side). At this time, the outsole 10 molded in the outsole molding process is warped due to the difference in thermal shrinkage between the vulcanized rubber layer 11 and the fabric layer 12, as shown in FIG. Since a convex warp occurs, gaps S ₁ and S ₂ are formed below and on the side of the outsole 10. Therefore, when the midsole molding polyurethane is injected into the mold 50 while the outsole 10 is warped, the polyurethane may enter the gaps S ₁ and S ₂ or the outsole may shift. . However, as shown in FIG. 3, the outsole 10 and the mold 50 are connected using the connecting shaft member 20, and the outsole 10 is fixed in a state in which the outsole 10 is pressed against the inner bottom surface of the mold 50. It is possible to suppress warping of the sole 10 and prevent a gap below or out of the outsole 10.

  The form of the connecting shaft member 20 is not particularly limited as long as it connects the outsole 10 and the mold 50 so that the outsole 10 is pressed against the inner bottom surface of the mold 50. In the first embodiment, the connecting shaft member 20 includes a shaft portion 21 and a head portion 22 provided at the proximal end of the shaft portion 21 as shown in FIG. As shown in FIG. 3, the head portion 22 is a portion for pressing the upper surface of the outsole 10 against the inner bottom surface of the mold 20. On the other hand, the shaft portion 21 is a portion for insertion into the through hole 10 a from the upper surface side of the outsole 10. A portion (tip portion) protruding from the lower surface side of the outsole 10 in the shaft portion 21 is press-fitted into a press-fit hole 50 a formed in the inner bottom surface of the mold 50. In addition to being formed of an elastic material, the shaft portion 21 is formed with a plurality of annular projections having a diameter larger than that of the press-fitting hole 50a on the outer peripheral portion thereof, so that the shaft portion 21 is press-fitted into the press-fitting hole 50a. Then, the annular protrusion is crushed inside the press-fitting hole 50a. For this reason, even if an upward force is applied from the outsole 10 to the head portion 22, the connecting shaft member 20 is caused by the frictional resistance generated between the annular protrusion of the shaft portion 21 and the inner peripheral surface of the press-fit hole 50 a. It is designed not to rise.

  By the way, in the first embodiment, the annular protrusion is provided not only at the tip end portion that is press-fitted into the press-fitting hole 50 a of the mold 50 in the shaft portion 21 but also at the portion that is inserted into the through-hole 10 a of the outsole 10. Yes. In addition, the diameter of the portion of the shaft portion 21 where the annular protrusion is provided is larger than the diameter of the through hole 10a. For this reason, the axial part 21 is press-fit not only with respect to the press-fit hole 50a but with respect to the through-hole 10a. For this reason, a gap is not formed between the outer peripheral surface of the shaft portion 21 and the through hole 10a even after the connecting shaft member cutting step described later is finished. Therefore, even when walking with a shoe having a shoe sole manufactured by the manufacturing method of the first embodiment, dirt or the like does not enter the gap or the shaft portion 21 does not wobble.

  The material of the connecting shaft member 20 is not particularly limited, and can be formed of a hard material such as metal, hard resin, or wood. Even if the connecting shaft member 20 is made of metal or the like, an elastic member is disposed on the inner peripheral portion of the press-fitting hole 50a, or an elastic deformation portion such as a leaf spring portion is formed on the outer peripheral surface of the shaft portion 21. If the contrivance is applied, the shaft portion 21 can be press-fitted into the press-fitting hole 50a. However, when the connecting shaft member 20 is buried in the completed shoe sole, the connecting shaft member cutting step described later is usually performed. For this reason, the connecting shaft member 20 (particularly the shaft portion 21) is preferably formed of a material that can be easily cut by a cutting tool such as a cutter or a scissors, and is preferably formed of an elastic material. When the shaft portion 21 of the connecting shaft member 20 is formed of an elastic material, not only the shaft portion 21 is easily cut, but the shaft portion 21 can be press-fitted into the press-fitting hole 50a without performing the above-described device. . As an elastic material for forming the connecting shaft member 20, in addition to various rubber materials mentioned as being usable for the vulcanized rubber layer 11 in the outsole 10, a styrene elastomer, an olefin elastomer, a vinyl chloride elastomer, urethane And various resin elastomers such as amide elastomers and amide elastomers. In the first embodiment, the connecting shaft member 20 is made of urethane rubber (U).

  After finishing the outsole setting process, a midsole molding process is performed.

1.3 Midsole Molding Process FIG. 5 is a cross-sectional view showing a state in which polyurethane is injected into the cavity of the mold 50 in the midsole molding process, cut along a plane perpendicular to the left-right direction. As shown in FIG. 5, the midsole molding step is a step of injecting and curing midsole molding polyurethane into the cavity of the mold 50 after the outsole setting step. In the first embodiment, the midsole molding step is performed in a state where the shoe body 30 having the upper is set on the upper part of the mold. For this reason, when the midsole molding process is finished, a shoe in which the outsole 10 and the shoe main body 30 are integrated via the midsole 40 (a shoe sole integrated with the shoe main body 30) is obtained.

  In the midsole molding step, the polyurethane is usually injected into the mold 50 by injecting the isocyanate compound A and the polyol compound B into the raw material supply port of the injection cylinder 60, and mixing these raw materials in the injection cylinder 60. After the reaction, it is carried out by pushing out from the nozzle at the tip of the injection cylinder 60 into the mold 50. When the isocyanate compound A and the polyol compound are reacted, a proper amount of a foam stabilizer, an antifoaming agent, a chain extender, a foaming agent, a catalyst or a colorant can be used to adjust the properties of the resulting polyurethane. .

  As the isocyanate compound A, toluene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, xylene diisocyanate, 4,4′-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, polymethylene polyphenyl isocyanate, 3,3′-dimethyl- 4,4′-diphenylmethane diisocyanate, 3,3′-dimethyl-4,4′-biphenylene diisocyanate, 3,3′-dichloro-4,4′-biphenylene diisocyanate, 4,4′-biphenylene diisocyanate or 1,5- Examples include organic polyisocyanates such as naphthalene diisocyanate. These isocyanate compounds can be used alone or in admixture of two or more.

  In addition, as polyol compound B, polyether polyol obtained by addition polymerization using ethylene oxide or propylene oxide as an initiator in the presence of a basic catalyst, or acrylonitrile or styrene is copolymerized in the polyether polyol to disperse polymer fine particles. Examples thereof include polymer polyols made from polyester, polyester polyols obtained by dehydration condensation of several carboxylic acids and polyhydric alcohols, and the like. These polyol compounds can be used alone or in admixture of two or more.

  The molding temperature and molding time in the midsole molding process vary depending on the type of isocyanate compound A and polyol compound B and are not particularly limited, but the molding time is usually 2 to 15 minutes, and the molding temperature (mold) 50 temperature) is usually 20 to 80 ° C. When a predetermined molding time has elapsed, the polyurethane injected into the mold 50 is cured between the outsole 10 and the shoe body 30 and can maintain the form of the midsole 40. At this time, since the polyurethane that forms the lower surface side of the midsole 40 is cured in a state where the polyurethane soaks into the fabric layer 12 of the outsole 10, the outsole 10 is integrated with the midsole 40. It has become.

  When the midsole molding process is completed, a connecting shaft member cutting process is subsequently performed.

1.4 Connecting shaft member cutting process FIG. 6 is a cross-sectional view showing a state in which the shoe sole (shoe) after the midsole molding process is taken out from the mold 50, cut along a plane perpendicular to the left-right direction. is there. FIG. 7 is a cross-sectional view of the shoe sole (shoe) that has been subjected to the connecting shaft member cutting step, cut along a plane perpendicular to the left-right direction. In the first embodiment, the head portion 22 of the connecting shaft member 20 buried in the boundary portion between the outsole 10 and the midsole 40 is locked at the upper end of the through hole 10a. As shown in FIG. 6, when the shoe sole after the midsole molding process is pulled upward from the mold 50, the connecting shaft member 20 follows the shoe sole, and the shaft portion 21 of the connecting shaft member 20 is the mold. The 50 press-fitting holes 50a are pulled out. For this reason, the lower surface of the shoe sole (outsole 10) removed from the mold 50 is in a state in which the distal end portion of the shaft portion 21 protrudes. The connecting shaft member cutting step is a step of cutting off the protruding portion of the shaft portion 21. The excision of the shaft portion 21 is usually performed using a cutter or a scissors.

  In the connecting shaft member cutting step, the length for cutting off the shaft portion 21 is not particularly limited. For example, when the connecting shaft member 20 left in the shoe sole is used as a non-slip projection such as a spike, the cut end of the shaft portion 21 left on the shoe sole is formed on the lower surface of the outsole 10. It is preferable to cut the shaft portion 21 so as to be located below the lower end surface of the non-slip convex portion or to be at a height similar to the lower end surface of the anti-slip convex portion. Further, when the connecting shaft member 20 left in the shoe sole is used as a slip sign, the cut end of the shaft portion 21 left in the shoe sole is a non-slip projection formed on the lower surface of the outsole 10. It is preferable to excise the shaft portion 21 so as to be higher than the lower end surface of the portion (position entering the upper side). Thereby, the user of the shoes recognizes that it is time to change his / her shoes when, for example, the non-slip convex portion on the lower surface of the outsole 10 is worn and becomes the same height as the shaft portion 21. It becomes possible to do. When the connecting shaft member 20 is used as a slip sign, the connecting shaft member 20 and the outsole 10 are connected to the connecting shaft member 20 such that the outsole 10 is a dark color such as black and the connecting shaft member 20 is a light color such as yellow. Are preferably given different colors. Thereby, it becomes possible to make a slip sign conspicuous.

  When the connecting shaft member cutting step is finished, a necessary finishing step such as deburring is performed, and then the production of the shoe sole (shoe) is completed. The shoe sole (shoe) manufactured by the manufacturing method according to the present invention is not only a state in which the outsole 10 and the midsole 30 are integrated with high adhesive strength, but also the warp of the outsole 10 and the polyurethane. There is no protrusion, and it looks beautiful and has high dimensional accuracy.

2. FIG. 8 shows a shoe sole manufacturing method according to the second embodiment. In the shoe sole manufacturing method according to the second embodiment, the outsole 10 is attached to the inner bottom surface of the mold 50 using the connecting shaft member 20 in the outsole setting step. It is sectional drawing which cut | disconnected and showed the state pressed by the plane perpendicular | vertical to the front-back direction. In the shoe sole manufacturing method of the first embodiment described above (see FIGS. 1 to 7), in the outsole molding step, a through hole 10a that penetrates the outsole 10 in the thickness direction is provided, and in the outsole setting step, By inserting the connecting shaft member 20 into the through hole 10 a from the upper surface side of the outsole 10 and press-fitting the distal end portion of the shaft portion 21 of the connecting shaft member 20 into the press-fitting hole 50 a formed in the mold 50, The sole 10 was fixed while being pressed against the inner bottom surface of the mold 50. On the other hand, in the shoe sole manufacturing method of the second embodiment, as shown in FIG. 8, a press-fitting hole 10 b is provided on the lower surface of the outsole 10, and a through hole 50 b is provided on the bottom wall portion of the mold 50. In the outsole setting step, the connecting shaft member 20 is inserted into the through hole 50b from the lower surface side of the mold 50, and the tip end portion of the shaft portion 21 protruding into the mold 50 from the inner bottom surface of the mold 50 is out. The outsole 10 is fixed in a state where it is pressed against the inner bottom surface of the mold 50 by press-fitting into the press-fitting hole 10 b from the lower surface side of the sole 10.

  Moreover, in the manufacturing method (refer FIGS. 1-7) of the shoe sole of the 1st embodiment mentioned above, the axial member 20 for connection in which the some cyclic | annular protrusion was formed in the predetermined interval over the substantially full length in the axial part 21 was used. While being used, the inner peripheral surface of the press-fitting hole 50a was formed as a simple cylindrical surface without irregularities. On the other hand, in the shoe sole manufacturing method of the second embodiment, as shown in FIG. 8, as shown in FIG. 8, the connecting shaft member 20 in which one annular protrusion is formed at the tip portion of the shaft portion 21 is used, and An annular groove for engaging with the annular protrusion is formed on the inner peripheral surface of the. As described above, the object for press-fitting the connecting shaft member 20, the direction in which the connecting shaft member 20 is press-fitted, and the press-fitting structure of the connecting shaft member 20 are the aspects described in the shoe sole manufacturing method of the first embodiment. It is not limited to, It can change suitably.

  In the shoe sole manufacturing method of the second embodiment, since the head portion 22 of the connecting shaft member 20 is locked at the lower end of the through hole 50b, the shoe sole that has finished the midsole molding step is used. When pulled out upward from the mold 50, the connecting shaft member 20 remains in the mold 50, and the shaft portion 21 of the connecting shaft member 20 is pulled out from the press-fitting hole 10 a of the outsole 10. For this reason, in the shoe sole of the second embodiment, there is no need to provide a connecting shaft member cutting step. The press-fitting hole 10b after the shaft portion 21 is pulled out may be left as it is, or another member may be press-fitted into the press-fitting hole 10b to use the member as a spike or a slip sign. About the other structure in the manufacturing method of the shoe sole of a 2nd embodiment, since it is the same as that of the manufacturing method of the shoe sole of a 1st embodiment, description is omitted.

3. FIG. 9 shows a shoe sole manufacturing method according to the third embodiment. In the shoe sole manufacturing method according to the third embodiment, the outsole 10 is attached to the inner bottom surface of the mold 50 using the connecting shaft member 20 in the outsole setting step. It is sectional drawing which cut | disconnected and showed the state pressed by the plane perpendicular | vertical to the front-back direction. In the shoe sole manufacturing method according to the first embodiment described above (see FIGS. 1 to 7) and the shoe sole manufacturing method according to the second embodiment (see FIG. 8), the connecting shaft member 20 includes the head 22. However, in the shoe sole manufacturing method according to the third embodiment, as shown in FIG. 9, the connecting shaft member 20 is composed only of the shaft portion 21 and does not have a head. It has become. The method of providing the annular protrusion on the outer peripheral portion of the shaft portion 21 is the same as the method for manufacturing the shoe sole of the first embodiment. In the shoe sole manufacturing method of the third embodiment, the lower end of the connecting shaft member 20 (shaft portion 21) is press-fitted into a press-fitting hole 50a provided on the inner bottom surface of the mold 50, and the bottom surface of the outsole 10 is also pressed. The outsole 10 and the mold 50 are connected by press-fitting the upper end of the connecting shaft member 20 (shaft portion 21) into the provided press-fitting hole 10b.

  In the shoe sole manufacturing method of the third embodiment, when the shoe sole after the midsole molding step is pulled upward from the mold 50, the connecting shaft member 20 follows the outsole 10 or the mold 50. It is determined by the frictional resistance in each part. For example, if the press-fitting hole 10b is made thinner than the press-fitting hole 50a or the press-fitting hole 10b is made deeper than the press-fitting hole 50a, the frictional resistance at the press-fitting hole 10b is made larger than the frictional resistance at the press-fitting hole 50a. The connecting shaft member 20 can follow the outsole 10. In order to ensure that the connecting shaft member 20 follows the outsole 10, the press-fitting hole 10 b is penetrated to the upper surface side of the outsole 10 and the upper end of the connecting shaft member 20 (shaft portion 21). May be projected upward from the upper surface of the outsole 10, and the upper end of the connecting shaft member 20 (shaft portion 21) may be buried in the midsole. About the other structure in the manufacturing method of the shoe sole of a 3rd embodiment, since it is the same as that of the manufacturing method of the shoe sole of a 1st embodiment or a 2nd embodiment, description is omitted.

DESCRIPTION OF SYMBOLS 10 Outsole 10a Through-hole 10b Press-fit hole 10h Reed side outsole 10t Toe side outsole 11 Vulcanized rubber layer 11a Lower layer 11b Upper layer 12 Fabric layer 20 Connecting shaft member 21 Shaft part 22 Head part 30 Shoe body 40 Midsole 50 Gold Mold 50a Press-fit hole 50b Through hole 60 Injection cylinder S ₁ gap S ₂ gap

Claims (5)

By injecting unvulcanized rubber into the mold for outsole molding, laying a cloth on the upper surface, and heating these materials while pressing, the unvulcanized rubber is made into vulcanized rubber, thereby preventing slippage. An outsole having a vulcanized rubber layer having a design applied to the lower surface and a fabric layer integrally fixed to the upper surface of the vulcanized rubber layer, the warp of which the central portion is convex on the fabric layer side. An outsole molding process to mold,
And outsole setting step of setting the inner bottom portion of the midsole molding die in a state in which the outsole is molded outsole molding process the bottom surface facing the inner bottom surface of the midsole molding die,
A midsole molding curing by injecting a polyurethane for midsole molded outsole setting step the finished midsole in the molding die,
A shoe sole manufacturing method for manufacturing a shoe sole in which an outsole and a midsole are integrated via the fabric layer,
In outsole setting step, for coupling to a central portion in a state where the warp in outsole lifted from the inner bottom surface of the midsole molding die occurs, consisting of a separate body from the outsole and midsole molding die by connecting to the inner bottom surface of the midsole molding die with the shaft member, midsole molded in a state where the central portion to which the warped is pressed against the inner bottom surface of the midsole molding die in the outsole A method for producing a shoe sole, characterized in that a process can be started.
In the outsole molding process, a through hole that penetrates the outsole in the thickness direction is provided,
In outsole setting step, insert the connecting shaft member into the through hole from the upper surface side of the outsole, press fitting the distal end portion of the connecting shaft member is press-fit hole formed in the inner bottom surface of the midsole molding die it the method for producing a shoe sole according to claim 1, wherein the fixing in a state of pressing the outsole to the inner bottom surface of the midsole molding die.
In the outsole molding process, a press-fit hole is provided on the lower surface of the outsole,
In outsole setting step, by press-fitting the distal end portion of the connecting shaft member which projects from the inner bottom surface of the midsole molding die midsole in the molding die from the lower surface side of the outsole to the press-fit hole, method for producing a shoe sole according to claim 1, wherein the fixing in a state of pressing the outsole to the inner bottom surface of the midsole molding die.
The method for manufacturing a shoe sole according to claim 2 or 3, wherein the connecting shaft member is formed of an elastic material, and a portion having a diameter larger than the press-fitting hole is formed at a distal end portion of the connecting shaft member.
  The method for manufacturing a shoe sole according to any one of claims 1 to 4, wherein after the midsole molding step is finished, a connecting shaft member cutting step is performed in which a portion protruding from the lower surface of the outsole in the connecting shaft member is cut.

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