JP5705464B2 - Insoles - Google Patents

Description

  The present invention relates to a shoe insole including a polypropylene-based material in a laminated structure.

  Conventionally, a shoe insole having a structure in which a plurality of sheet-like members are laminated and the peripheral portion of each layer is welded and integrated by welding (heating by high-frequency current energization) or the like is well known and widely spread. ing.

  In general, since a shoe insole is used by being inserted into a shoe, various performances such as air permeability, sweat absorption, heat retention, antibacterial property, deodorization property, and cushioning property are required. For this reason, the material etc. for exhibiting these performances are suitably used for each sheet-like member. In addition, as a basic performance that is a prerequisite for demonstrating these performances, a shoe insole is required to have a waist strength to prevent slippage and twisting in the shoe and to exhibit stability.

  As the insole of such a shoe insole, for example, as a shoe insole previously filed by the present applicant, as a surface layer, a surface side sheet member as a surface layer, as a bottom surface side sheet member, as an intermediate layer An intermediate sheet member is provided, and these sheet members are woven with a processed yarn obtained by coating the entire surface of polyester yarn or nylon yarn with EVA resin (ethylene-vinyl acetate copolymer resin). A shoe insole (for example, refer to Patent Document 1) is known in which a gap between the weaves is set within a predetermined range and the intermediate sheet member is bulky by forming a heel on the whole with a twill weave as a processed yarn.

  Although the shoe insole is excellent in that it has the strength of the waist of the shoe insole, in order to obtain the strength of the waist that exhibits the prevention of displacement in the shoe, the sheet member is polyester yarn or The entire surface of the nylon thread is woven with a processed thread obtained by coating with EVA resin (ethylene-vinyl acetate copolymer resin). To obtain sufficient waist strength, In addition, the sheet member coated with EVA resin (ethylene-vinyl acetate copolymer resin) is overlapped with each other and the peripheral portion of each layer is welded together with the hot-melt adhesive, and the manufacturing process is troublesome and the cost increases. There was room for improvement.

  On the other hand, it is conceivable to use, for example, polypropylene as a material having sufficient waist strength. However, usually, polypropylene is not widely used as a material for a shoe insole because welding cannot be performed only by energization even when a welder machine used for manufacturing a shoe insole is used.

  For example, at least one of the front fabric and the back fabric is made of a woven fabric, a knitted fabric or a synthetic leather whose main material is polyester or polypropylene. And a single-layer or multi-layer intermediate sheet made of activated carbon impregnated sheet, antibacterial processed sheet or a combination thereof, and a hot melt nonwoven fabric or hot melt powder containing a polyamide-based component is used as a surface fabric. Between the intermediate sheets, between the layers of the intermediate sheet and between the intermediate sheet and the back fabric, or including the above-mentioned front and back fabrics, and between them, a polyamide-based component and activated carbon impregnation and And / or laminating an antibacterial processed single-layer composite intermediate sheet, Adhering the periphery simultaneously blown into the shoe insole shape by energization of the flow (hereinafter. Referred welder working) by, in made shoe insoles (e.g., see Patent Document 2.) It is known.

However, the invention according to Patent Document 2 always requires a hot melt nonwoven fabric or hot melt powder containing a polyamide-based component to be interposed between layers in order to weld polypropylene.
For this reason, every time polypropylene is interposed as a layer, it is necessary to additionally provide a hot melt layer containing a polyamide-based component. Similar to such insoles, there was a problem in that the manufacturing man-hours increased and the cost increased.

Japanese Patent No. 3932421 Noto 3054968

  The present invention has been made in view of the above circumstances, has a waist strength for preventing slippage in shoes and exhibiting stability, and can be realized more simply and at low cost. An object of the present invention is to provide a shoe insole including a material in a laminated structure.

The present invention has a configuration in which an intermediate layer and a surface layer are sequentially laminated on a bottom layer, the bottom layer is a first sheet-like member, and the intermediate layer is a second layer laminated on the first sheet- like member. The first sheet-like member is woven from a processed yarn having a core-sheath structure in which the periphery of the core material is covered with a sheath material, and the main component of the core material and the main component of the sheath material are woven Both of them are polypropylene, the sheath material has a lower melting point than the core material, and the insole in which the peripheral portions of the respective layers are fixedly integrated by welding, the second sheet-like member has a large number of openings. A sheath material of the first sheet-like member is melt-impregnated and solidified in the opening in the peripheral edge, and the sheath material is fixed in the opening of the second sheet-like member, and a bottom layer and an intermediate layer Means for solving a problem with a shoe insole characterized by being fixed To.

  In addition, about the said core material or sheath material, "all the main components are polypropylenes" means not only the propylene homopolymer (homopolymer) but the propylene copolymer (random copolymer, block copolymer). It is a purpose to include.

  Examples of the resin used for the copolymer of propylene include ethylene, 1-butene, 1-hexene, 1-octene, 1-nonene, 1-decene, 3-methyl-1-butene, and 4-methyl-1 -Pentene or the like can be used.

  As for the processed yarn, the core material and the sheath material can be manufactured by spinning using, for example, a known melt spinning apparatus for composite fibers. The composition ratio between the core material and the sheath material is 20-80: 80-20. In addition, the processed yarn having such a configuration uses about 500 denier to 1500 denier.

  Further, as a means for making the sheath material have a low melting point with respect to the core material, various means including the polymer can be used. For example, isotactic polypropylene (homopolymer) having high stereoregularity can be used. ) As a core material, and a polypropylene having a structure in which ethylene is apparently copolymerized in a molecule obtained by homopolymerization with a metallocene catalyst may be used as a sheath material, or a polypropylene obtained by homopolymerization as a core material, It can be set as the sheath material made into the copolymer with ethylene which has propylene as the main component.

  The other sheet-like member may be a non-woven fabric having openings formed as gaps between the fibers, or a sheet-like member provided with openings formed as a large number of through holes. That is, the “opening” in the present invention refers to an opening formed on both sides or one side of a sheet-like member, such as a gap between fibers such as a nonwoven fabric, a hole formed between fibers of knitted fibers or woven fibers.

  Furthermore, in the present invention, on the premise of the above-described invention, a shoe insole characterized in that the sheet-like member serving as the bottom layer has a mesh structure is used as a means for solving the problems. Here, the “network structure” includes woven or knitted fibers in a mesh shape.

According to the invention of claim 1, the present invention has a configuration in which an intermediate layer and a surface layer are sequentially laminated on a bottom layer, the bottom layer is a first sheet-like member, and the intermediate layer is the first layer has a second sheet-like member which is laminated on a sheet-like member, said first sheet-like member is woven around the core material from the processed yarn having a core-sheath structure coated with sheath material, the core material In the insole, wherein the main component and the main component of the sheath material are both polypropylene, the sheath material has a melting point lower than that of the core material, and the peripheral portions of the layers are bonded and integrated by welding. The sheet-like member has a large number of openings, and the sheath material of the first sheet-like member is melt-impregnated and solidified in the opening at the peripheral edge, and the sheath material is placed in the opening of the second sheet-like member. Shoe insole characterized by fixing the bottom layer and intermediate layer Therefore, there is no need to add additional layers or additives to fuse polypropylene to the insole laminating stage, and the construction of the polypropylene thread itself prevents slippage in the shoe. A shoe insole having waist strength for exerting stability can be obtained.

  That is, at the periphery of the shoe insole, the sheath material of the polypropylene-made processed yarn having a core-sheath structure is melted and impregnated in another layer and solidified. The high affinity with the sheath material can maintain the shape stability of the entire shoe insole, and the core material of the polypropylene processed yarn does not melt and can realize the strong waist of polypropylene. It is.

  In addition, in the process of laminating the sheet-like member of the shoe insole, it is possible to realize a structure in which the peripheral portion is welded and integrated by a single welder process, and each layer is easily bonded to each other, and the shoe has excellent characteristics at low cost. Can provide a floor.

  Further, the resin mainly composed of polypropylene as the sheath material is impregnated into the opening of another sheet-like member and solidified, so that the intermediate layer and the bottom layer can be firmly fixed.

  Further, the other sheet-like member in the above-mentioned shoe insole is made of a very wide variety of materials depending on the purpose of the shoe insole. As long as an opening is formed in the sheet-like member, the peripheral edge can be fixed without causing a problem of compatibility between the resins, and it has a soft polypropylene and has excellent air permeability. Can provide insoles.

Furthermore, in the invention according to claim 2, in addition to the effects of the invention according to claim 1, the sheet-like member serving as the bottom layer has a mesh structure, so that the peripheral portion serving as the heating location The sheath material polypropylene resin is melt-impregnated in the openings of the other sheet-like members and can firmly fix the sheet-like member which becomes the bottom layer and the other sheet-like member, and becomes the bottom layer. Since the space of the mesh of the sheet-like member and the opening of the other sheet-like member that contacts this is secured, air permeability from the sheet- like member of the bottom layer of the shoe insole to other sheet-like members is secured. can do.

The perspective view which shows the plane side of the shoe insole which concerns on Example 1 of this invention. The perspective view which shows the bottom face side of the shoe insole which concerns on Example 1 of this invention. Explanatory drawing which shows the layer structure of the shoe insole which concerns on Example 1 of this invention. 1 is an AA enlarged explanatory cross-sectional view of a shoe insole according to Embodiment 1 of the present invention, with the middle omitted in FIG. The perspective view which shows the 2nd sheet-like member in the shoe insole which concerns on Example 2 of this invention. The expanded description sectional view which abbreviate | omitted the middle in the shoe insole concerning Example 2 of this invention. The expanded explanatory sectional view which abbreviate | omitted the middle in the shoe insole concerning Example 3 of this invention.

  It has a structure in which sheet-like members that form a bottom layer, an intermediate layer, and a surface layer are laminated. At least one layer of the sheet-like member contains polypropylene, and the peripheral portions of the sheet-like members of the respective layers are fixed to each other by welding. The first sheet-like member that is the bottom layer is made of a processed yarn having a core-sheath structure, the main component of the core material and the main component of the sheath material are both polypropylene, and the melting point of the core material The melting point of the sheath material is low, the second sheet-like member of the intermediate layer that contacts the first sheet-like member has a plurality of irregular openings, and the sheath material in the first sheet-like member is melted Since the opening is impregnated and solidified, and the first sheet-like member is a shoe insole having a mesh-like woven structure, in the lamination step of the shoe insole, further lamination for welding polypropylene And additives In the polypropylene processed yarn having a core / sheath structure, the sheath material is in a molten state and is fixed to other layers, and the polypropylene processed yarn having the core / sheath structure is polypropylene without melting the core material. A strong waist can be realized. In addition, the high affinity between the core material and the sheath material, both of which are polypropylene, makes it possible to maintain the shape stability of the entire shoe insole. A configuration that can be integrally fixed by processing can be realized, and a shoe insole having excellent characteristics can be provided at low cost. Further, the second sheet-like member has a plurality of openings, and the sheath of the first sheet-like member is melted so that the opening of the second sheet-like member is impregnated and solidified. The intermediate layer and the bottom layer can be fixed. In addition, since the first sheet-like member has a mesh structure, a space where the meshes in the mesh communicate with the openings of the second sheet-like member is secured, so that the bottom layer of the shoe insole is changed to the second sheet-like member. Therefore, it is possible to provide an excellent shoe insole that can contribute to ensuring the breathability of a shoe insole.

  It shows below about the shoe insole 1 which concerns on Example 1 of this invention. 1 is a perspective view showing a flat surface side of a shoe insole 1 according to the first embodiment, FIG. 2 is a perspective view showing a bottom surface side of the shoe insole 1 according to the first embodiment, and FIG. FIG. 4 is an AA enlarged cross-sectional view of the shoe insole 1 according to the first embodiment shown in FIG.

  As shown in FIGS. 1 to 4, a shoe insole 1 (1 a) according to Example 1 of the present invention is a sheet-like member made of a knitted fabric that becomes a surface layer 2, and a three-layer sheet shape that becomes an intermediate layer 3. This is a shoe insole 1a obtained by laminating a first sheet-like member 4 as a member and a bottom layer, welding these peripheral portions 11 by welding, and cutting and removing excess portions.

  The peripheral edge portion 11 is formed by the one-time welding process. By the welding process, the intermediate layer 3 and the surface layer 2 in contact with the intermediate layer 3 are welded by the molten hot melt adhesive layer 31, and the second sheet in the intermediate layer 3 that contacts the first sheet-like member 4. Of the polypropylene processed yarns constituting the first sheet-like member 4, the sheath member is melt-impregnated and then solidified, and the first sheet-like member 4 and the second sheet-like member 30 are integrally laminated. Become.

  In addition, as shown in FIG. 1, each layer is welded in a line to adjust the size according to the size of the user's foot on the toe side simultaneously with the welding of the peripheral edge portion 11 by the welding process. A cut line 12 is formed.

  Further, as shown in FIG. 1, simultaneously with the welding of the peripheral edge portion 11, a partial welding portion 10 is formed at the center position of the toe side half of the shoe insole 1a. The welded portion 10 has a function for preventing displacement of the stacked layers.

  As shown in FIGS. 2 and 3, the first sheet-like member 4 serving as the bottom layer of the shoe insole 1 a according to the first embodiment is wound around a core-sheath structure (around the core material 41 with a sheath material 42. Woven as a mesh having a mesh 43 structure. The processed yarn 40 is about 1000 denier and has a width of about 0.5 mm.

  The core material 41 in the first sheet-like member 4 is made of polypropylene having a melting point of about 150 ° C. to 170 ° C., and the sheath member 42 in the first sheet-like member 4 is made of polypropylene having a melting point of about 110 ° C. to 130 ° C. The main component is a propylene-ethylene copolymer. The first sheet-like member 4 of the bottom layer according to the first embodiment is formed by plain weaving the processed yarn 40 of about 0.5 mm, and the mesh gap, that is, the mesh size is about 1 mm square. It is.

  The intermediate layer 3 of the shoe insole 1a according to the first embodiment includes a second sheet-like member 30 made of a polyester fiber non-woven fabric disposed on the bottom surface side, a polyurethane foam layer 32 disposed on the front surface side, and the first layer. It consists of a three-layered sheet-like member of a hot melt adhesive layer 31 laminated on the two-sheet-like member 30 and disposed between the second sheet-like member 30 and the polyurethane foam layer 32.

  The second sheet-like member 30 has a thickness of about 1 millimeter that ensures air permeability, and has a large number of irregularly shaped openings 300 formed between the fibers on the surface thereof.

  The polyurethane foam layer 32 has a thickness of about 1 millimeter and has air permeability and cushioning properties.

  The hot melt adhesive layer 31 is formed as a rough coating on the second sheet-like member 30. As described above, since the surface of the second sheet-like member 30 has a large number of irregularly shaped openings 300 formed between the fibers, a part of the openings 300 is hot even in the laminated state. Since the melt adhesive layer 31 is not present, air permeability is maintained. For this reason, the 2nd sheet-like member 30 and the polyurethane foam layer 32 laminated | stacked via the hot-melt-adhesive agent layer 31 hold | maintain breathability.

  The surface layer 2 according to Example 1 is a knitted fabric having a slight stretchability made of a synthetic fiber having air permeability.

  About the adhering structure by the said weld process of the 1st sheet-like member 4 of the bottom face layer in the peripheral part 11, and the 2nd sheet-like member 30 of the intermediate | middle layer 3, the core material 41 of the 1st sheet-like member 4 which is a bottom face layer. In the state where the characteristic of the polypropylene is maintained without melting, the opening 300 becomes a gap between a large number of fibers exposed on the surface of the second sheet-like member 30 contacting the first sheet-like member 4 In the state where the sheath material 42 of the processed yarn 40 constituting the first sheet-like member 4 is melted and impregnated, and the sheath material 42 is not completely detached from the core material 41 due to fluidity. It is in the point which becomes the structure which penetrated in the member 30 and lost fluidity and solidified.

  The knitted fabric which is the surface layer 2 is welded onto the polyurethane foam layer 32 of the intermediate layer 3 by the above-described welding process on the peripheral edge portion 11 while being laminated on the intermediate layer 3. The knitted fabric which is the surface layer 2 is welded onto the polyurethane foam layer 32 of the intermediate layer 3 by the above-described welding process on the peripheral edge portion 11 while being laminated on the intermediate layer 3. In this welding, the hot melt adhesive layer 31 between the polyurethane foam layer 32 and the second sheet-like member 30 passes through the polyurethane foam layer 32 toward the surface layer 2 in a molten state, and the surface layer 2 and the polyurethane foam The layer 32 is welded.

  By adopting the above configuration, the sheath material 42 of the processed yarn 40 constituting the first sheet-like member 4 of the bottom layer is melted and does not completely separate from the core material 41 due to fluidity. Due to the so-called anchor effect in which the sheet-like member 30 enters and solidifies into the opening 300 that becomes an irregularly formed gap, and cannot be removed from the second sheet-like member 30 and fixed, An excellent insole 1a utilizing the strong characteristics of the waist can be provided at a low cost.

  In addition, about the raw material of the surface layer 2 of the shoe insole 1a in the present Example 1, and the raw material of parts other than the 2nd sheet-like member 30 among the intermediate | middle layers 3, the property made into the shoe insole 1a, for example, Various conventionally known materials can be used for the sheet-like member in accordance with air permeability, sweat absorption, heat retention, antibacterial properties, deodorization properties, cushioning properties, and the like. As examples of such materials, for example, hemp, cotton, wool, rayon, polyester, polyamide (nylon, etc.), blended materials using these, antibacterial processed materials, activated carbon, various elastomers, etc. may be used as appropriate. it can.

  Moreover, in the present Example 1, although the structure which ensures air permeability was shown as the shoe insole 1a whole, it does not interfere with what does not have air permeability.

  Furthermore, in the present invention, for the purpose of improving the sweat absorbency, heat retaining property, antibacterial property, deodorizing property, cushioning property and the like of the shoe insole 1a, the intermediate layer 3 and the surface layer 2 are interposed between the surface layer 2 and the intermediate layer 3. Various layers, such as a sheet form, a granular form, and a gel form, can be provided between the bottom layer (first sheet-like member 4).

  In the first embodiment, the melted polypropylene of the sheath material 42 is impregnated up to the intermediate layer 3. However, the present invention is not limited to this, and the impregnated polypropylene of the sheath material 42 extends to the surface layer 2. It may be reached. That is, the surface layer 2 and the intermediate layer 3 may function as a unit.

  Moreover, in the said Example 1, although the process thread | yarn 40 in the 1st sheet-like member 4 is made into a plain weave structure, this invention is not limited to this, A twill weave, satin weave, and these change structures may also be used. It can or may be organized.

  A shoe insole 1 (1b) according to a second embodiment of the present invention will be described. The appearance of the shoe insole 1b according to the second embodiment of the present invention is substantially the same as the shoe insole 1a of the first embodiment shown in FIGS. That is, the shoe insole 1b according to the second embodiment includes a sheet-like member made of a knitted fabric that becomes the surface layer 2, a three-layer sheet-like member that becomes the intermediate layer 3, and a first sheet-like member that becomes the bottom layer. 4, the peripheral edge 11 is welded by welding, and the surplus portion is cut and removed. This is the same as the shoe insole 1 b according to the first embodiment. For this reason, a common location is demonstrated with reference to the same drawing as Example 1. FIG. The first sheet-like member 4 is made of a processed yarn 40 having a core-sheath structure. The main component of the core material 41 and the main component of the sheath material 42 are both polypropylene, and the sheath material is higher than the melting point of the core material 41. The point that the melting point of 42 is low is also common to the shoe insole 1b according to the first embodiment.

  A shoe insole 1b according to the second embodiment of the present invention is a second in which a plurality of openings 301 are formed in the synthetic resin sheet shown in FIG. 5 instead of the second sheet-like member 30 made of the nonwoven fabric of the first embodiment. The only difference is that the sheet-like member 30 is used. FIG. 6 shows a partially omitted enlarged cross-sectional explanatory diagram of the structure in comparison with the first embodiment.

  About the structure of the shoe insole 1b which concerns on the said Example 2, the sheath material 42 of the process thread | yarn 40 which comprises said 1st sheet-like member 4 in the opening part 301 formed in the synthetic resin sheet in the peripheral part 11 is provided. It is melted and impregnated, and the sheath material 42 enters the second sheet-like member 30 in a state where the sheath material 42 is not completely detached from the core material 41 due to fluidity, and the fluidity is lost and solidified.

  According to the said structure, performance is stabilized and excellent in the point from which the binding force of each part of the 1st sheet-like member 4 and the 2nd sheet-like member 30 becomes substantially uniform.

  The appearance of the shoe insole 1 (1c) according to the third embodiment of the present invention is substantially the same as the shoe insole 1c of the first embodiment shown in FIGS. 1 and 2, but the overall number of layers is reduced. Yes. As shown in FIG. 7, the peripheral edge portion 11 formed by welding is composed of only two layers of the first sheet-like member 4 and the second sheet-like member 30. The filling material 5 is enclosed in the vicinity of the center of the shoe insole 1c.

  As in Example 1 and Example 2, the first sheet-like member 4 is composed of a processed yarn 40 having a core-sheath structure, and the main component of the core material 41 and the main component of the sheath material 42 are both polypropylene, The sheath material 42 has a melting point lower than the melting point of the core material 41. Further, the second sheet-like member 30 is made of a polyester fiber non-woven fabric common to the first embodiment.

  About the adhering of the first sheet-like member 4 and the second sheet-like member 30 in the peripheral edge portion 11 of the third embodiment, the core material 41 of the first sheet-like member 4 which is the bottom surface layer does not melt and the polypropylene The sheath material 42 of the processed yarn 40 constituting the first sheet-like member 4 is formed in the opening 300 of the second sheet-like member 30 that is in contact with the first sheet-like member 4 in a state in which the elastic characteristics are maintained. In a state where it is melted and impregnated, and the sheath material 42 enters the second sheet-like member 30 in a state where the sheath material 42 is not completely detached from the core material 41 due to fluidity, and loses fluidity and solidifies. Common to the first embodiment.

  The third embodiment is superior to the first and second embodiments in that it is thinner, lighter, and cheaper than the first and second embodiments. The filler 5 encapsulated in the third embodiment has various performances depending on the purpose to be achieved by the shoe insole 1c, such as breathability, sweat absorption, heat retention, antibacterial properties, deodorization properties, and cushioning properties. Known materials can be selected as appropriate.

  With the above configuration, the shoe insole 1c according to the third embodiment can be a shoe insole 1c that can reduce the number of layers, can be lightweight, and can exhibit the strong properties of polypropylene.

1 Insoles 1a Insoles (Example 1)
1b Insoles (Example 2)
1c Insoles (Example 3)
DESCRIPTION OF SYMBOLS 10 Welding part 11 Peripheral part 12 Cut line 2 Surface layer 3 Intermediate layer 30 2nd sheet-like member 300 Opening part 301 Opening part 31 Hot melt adhesive layer 32 Polyurethane foam layer 4 First sheet-like member 40 Processed yarn 41 Core material 42 Sheath material 43 Mesh 5 Filler

Claims (2)

An intermediate layer and a surface layer are sequentially laminated on the bottom layer, the bottom layer is a first sheet-like member, and the intermediate layer is a second sheet-like member laminated on the first sheet - like member. And the first sheet-like member is woven from a processed yarn having a core-sheath structure in which the core material is covered with a sheath material, and the main component of the core material and the main component of the sheath material are both polypropylene. Yes, in the insole where the sheath material has a lower melting point than the core material, and the peripheral portions of the respective layers are integrally fixed by welding.
The second sheet-like member includes a large number of openings,
The sheath material of the first sheet-like member is melted and impregnated in the opening at the peripheral edge and solidified, and the sheath material is fixed in the opening of the second sheet-like member, and the bottom layer and the intermediate layer are fixed. Shoe insole characterized by that.   The insole according to claim 1, wherein the sheet-like member serving as the bottom layer has a mesh structure.

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