JP2003310302A - Shoe sole or insole using hollow resin filament and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe sole or an insole using a hollow resin filament and a manufacturing method therefor which can be used for a variety of footwears such as shoes, are superior in hygiene and stability such as ventilation and functions such as shock absorbency, and good for fitting and walking without tightness feeling. <P>SOLUTION: A cushion member 10 is manufactured by compression molding of the hollow resin filament 30 in an arbitrary shape and it is preferable for the cushion member 10 to be used as a shoe sole 12 or an insole 13 for supporting a load from a foot 1. Air which exists in air chambers 31a in each filament 31 and exists in hollows formed between the filaments 31 is pushed out by stepping (pressing) with the foot 1 and air is sucked into the air chambers 31a and the hollows by floating (depressing) the foot 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole or an insole used for various footwear such as shoes, and a method for manufacturing the same, and more specifically, to a hollow continuous wire and / or at least a thermoplastic resin. Random loops of short filaments or curls consisting of three-dimensional structure with voids of specified bulk density formed by contact entanglement of adjacent filaments, hygienic aspects such as breathability and stability, shock absorption, etc. The present invention relates to a shoe sole or an insole using a hollow resin filament, which is excellent in the functional aspect, does not have a feeling of tightness, is comfortable to wear and has a good walking condition, and is inexpensive, and a manufacturing method thereof.

[0002]

[Prior Art] Currently, leather shoes, sneakers, boots,
A wide variety of footwear (hereinafter simply referred to as shoes or soles) such as sandals and slippers has been widely used. In some cases, an insole is used on the sole of the shoe. The insole has the effect of enhancing the cushioning and making the body appear taller.

Some of the soles and insoles emphasize the health, such as stimulating the soles of the feet. As the sole of the foot is said to be the second heart, stimulating the sole of the foot is very effective. This is because the reflexes that stimulate the soles of the feet stimulate the entire body, activating each organ of the body. Here, adjustments are made such that those whose functions are excessively promoted are suppressed, and those whose functions are deteriorated are activated. Also,
It also has the effect of increasing parasympathetic activity, relieving mental and physical tension, and relaxing. Further, since blood circulation in the foot is improved, blood circulation in the whole body is improved, and various conditions are improved.

[0004] Shoes and insoles are often antibacterial and deodorant. In general, in this way, it is hygienic, there is no crampiness, there is no toe contact, comfort and walking are good, and it is excellent in terms of stability and shock absorption. , Preferred as shoes and insoles.

[0005]

[Problems to be Solved by the Invention] However, antibacterial
Even if it is said that it is deodorized, it is undeniable that the current shoes (particularly leather shoes) have poor ventilation in the shoes and do not properly deal with perspiration and the like, so that they are unsanitary. Generally, a human sweat gland is opened almost all over the body, and it is divided into two types, an eccrine gland (small sweat gland) and an apocrine gland (large sweat gland), depending on the secretion mode. It is an eccrine gland, and especially the sole of the foot is the site where this sweat gland density is the highest in the whole body. Further, the opening of a general sweat gland is located on the concave surface of the skin, whereas the sole of the foot is open on the convex surface, and therefore adheres to a contacted object (shoe sole or the like) as a toeprint. Further, since the component of the sweat on the sole has a higher salt concentration than the sweat on other parts, it is difficult to evaporate. Also, if there is body hair, a space is formed due to the relationship between the function of the hair and the air, and it becomes a non-greasy state and breathability is maintained, but since the sole of the foot is not the only body hair on the whole body, sweating occurs. There is also the problem of difficulty. In this way, even though the soles have a high sweat gland density and a large amount of dead steam, they often wear occlusive shoes, which deteriorates the ventilation and causes sweat to cause discomfort. It is a cause of athlete's foot and bad odor.

In addition, when walking on a paved sidewalk for a long time, the wear on the knees and the waist transmitted from the legs cannot be neglected as well as the abrasion of the shoes. Therefore, a shoe sole or an insole having a good shock absorption property is required, but those having such a function are often relatively expensive, and it is difficult to provide it at a low price as it becomes widely popular. is there. Also, if you are short,
Although it may be covered with an insole, it has many problems such as poor breathability and slipperiness in shoes, and has many drawbacks in material and shape, and also has inconvenience such as poor comfort and walking.

Therefore, in view of the above problems, the present invention is formed by contact-entangled collection of adjacent continuous filaments of hollow continuous filaments and / or short filaments of at least random loops or curls made of a thermoplastic resin. Consisting of a three-dimensional structure with voids of a specified bulk density, it is excellent in hygiene such as breathability and functional aspects such as stability and shock absorption, it does not feel cramped, it is comfortable and comfortable to walk in, and it is inexpensive. An object of the present invention is to provide a shoe sole or an insole using a hollow resin filament. Moreover, it aims at providing the suitable manufacturing method of the shoe sole or insole using the said hollow resin filament.

[0008]

The invention according to claim 1 is
Hollow continuous filament and / or at least thermoplastic resin
Alternatively, a hollow resin filament, characterized by being formed by compression molding a three-dimensional structure having voids of a predetermined bulk density, which are formed by contact entanglement of adjacent filaments of random loops of short filaments or curls. Is a shoe sole or an insole.

The "continuous filaments and / or short filaments" are preferably thermoplastic resins such as general-purpose plastics (polyolefin, polystyrene resin, methacrylic resin, polyvinyl chloride, etc.), engineering plastics (polyamide, polycarbonate, saturated polyester). , Polyacetal, etc.) and the like. For example, it is preferably made of a thermoplastic elastomer such as polyethylene (hereinafter referred to as PE), polypropylene (hereinafter referred to as PP) or nylon.

Particularly, a polyolefin resin such as PE or PP is mixed with vinyl acetate resin (hereinafter referred to as VAC), vinyl acetate vinyl copolymer (hereinafter referred to as EVA) or styrene butadiene styrene (hereinafter referred to as SBS). Those are preferable. At this time, the mixing ratio of the vinyl acetate content of the polyolefin resin and VAC or EVA is 70 to 97% by weight:
3 to 30% by weight, preferably 80 to 90% by weight: 10
20% by weight is preferred. This is 3 VAC or EVA
This is because the impact resilience is reduced when the content is less than 30% by weight and the thermal characteristics are reduced when the content is more than 30% by weight. The mixing ratio of the polyolefin resin and SBS is 50 to 97% by weight: 3 to 50% by weight, preferably 70 to 90% by weight.
0 to 30% by weight is preferable. Further, the polyolefin resin may be a recycled resin. It is also preferable to superpose them in multiple layers.

The structure of the "continuous line and / or short line" is preferably hollow. A pipe shape is particularly preferable. In the case of a hollow continuous line and / or a short line, air is trapped in the tube, the characteristics of the air spring are developed, and a unique cushioning property is generated, which is preferable. Buckling can also be prevented. Moreover, the rigidity of the three-dimensional structure is maintained by the entry of air. The hollow may be continuous or discontinuous. An example is a case in which one filament has both a hollow portion and a portion in which the hollow portion is closed.

The diameter of the "continuous wire and / or short wire" is
It is preferably 1.0 to 3.0 mm, and particularly preferably 1.5 to 2.0 mm. When it is less than this range, the filament becomes stiff and the number of fused portions increases, so that the porosity decreases. If it is more than this, the filament is too stiff, loops or curls are not formed, the number of fused portions is reduced, and the strength is reduced. Also,
When the hollow ratio is 10% or less, it does not contribute to weight reduction, and when it is 80% or more, the cushioning property is deteriorated.

The bulk density of the "three-dimensional structure" is 0.005 to
0.08 g / cm ³ , preferably 0.02 to 0.06
It is preferably g / cm ³ . Bulk density 0.005g
If it is less than / cm ³ , the strength will decrease. Bulk density 0.08g
If it is / cm ³ or more, the weight cannot be reduced and the elasticity disappears. The hollow resin filaments are not limited to have a constant density as a whole, but may have a coarse and dense structure at predetermined intervals. The bulk density in this case is 0.005 to 0.0 in the rough portion.
3 g / cm ³ , preferably 0.008 to 0.03 g / c
m ^3, in particular 0.01~0.03g / cm ³ are preferred. In the dense portion, 0.03 to 0.08 g / cm ³ , preferably 0.04 to 0.07 g / cm ³ , particularly 0.05 to 0.
06 g / cm ³ is preferred.

The porosity of the "three-dimensional structure" is 96 to 99.
%, Preferably 97 to 99%, particularly preferably 97 to 98%. The porosity is preferably in the above range in order to maintain elasticity and strength as a shoe sole or an insole and reduce the weight. [Porosity (%)] = (1- [bulk density] / [density of resin]) × 100

The "shoe sole" is not limited to a shoe sole such as leather shoes, sneakers, boots, deck moccasins or snow shoes, but includes a sole portion such as sandals or slippers. The "insole" is preferably one that is detachably attached to the sole of the shoe in the shoe. Here, at least the sole or the insole may be made of a hollow resin filament, but the entire shoe may be made of a hollow resin filament. In addition, a part of the shoe sole or insole (for example, a portion that becomes a core) may be formed of a hollow resin filament.

The invention according to claim 2 is the shoe sole or insole using the hollow resin filament according to claim 1, wherein the three-dimensional structure has air permeability.

Here, it is preferable that the filaments and the voids formed by the filaments are provided with air permeability, and that the hollow portion in each filament is also provided with air permeability. As a result, the air in the shoe is replaced, and the ventilation in the shoe can be suitably promoted.

The invention according to claim 3 is characterized in that, in the three-dimensional structure, the internal air is pushed out by being pressurized, and the air is sucked in by being decompressed. A shoe sole or an insole using the hollow resin filament described in 2.

The term "inside" refers to a hollow portion in each filament or a void formed by the filament and the filament. Here, when the space is pressurized (stepping on), the air inside is stepped on, and when the pressure is reduced (floating), the air is sucked into the inside (bellows phenomenon), and air convection occurs. It is excellent not only in terms of internal ventilation, but also in shock absorption due to its cushioning characteristics (air cushion). Further, since the sole of the foot is suitably massaged by stepping on the air cushion, there is also a swelling relief effect and a fatigue recovery effect.

According to a fourth aspect of the present invention, in the three-dimensional structure, the load and the floor reaction force are dispersed on the entire sole of the foot, and the hollow resin filament according to any one of the first to third aspects is used. Used shoe sole or insole.

When the sole or insole is pressed, the sole or shoe is fitted to the entire surface of the sole and receives the entire surface of the sole, so that the load is shared by the part of the arch and the surface pressure of the sole is suitable. descend. For example, when the standing sole is on the ground, a force equivalent to the force of weight and inertia to press the ground acts as a reaction force from the ground to the sole (floor reaction force). Since it is relaxed on the sole or the whole surface of the insole, there is little fatigue. In this way, since the stress dispersion effect (stress escapement) works, the shock absorption property is excellent.

The invention according to claim 5 is characterized in that the three-dimensional structure has a high dynamic friction coefficient.
A shoe sole or an insole using the hollow resin filament according to any one of the claims.

As described above, when the coefficient of dynamic friction is high, slippage in the shoes is small and the anti-slip property is good. Therefore, it is particularly preferably used as an insole.

According to a sixth aspect of the present invention, a hollow continuous linear filament and / or a short linear filament made of at least a thermoplastic resin or a random loop or a curl of adjacent linear filaments, which are adjacent to each other, are contact-entangled with each other on a female mold. A shoe sole using a hollow resin filament, characterized in that a three-dimensional structure having voids of a predetermined bulk density is placed, and the three-dimensional structure is clamped by the female mold and the male mold, and molded. Alternatively, it is a method of manufacturing an insole.

The "female type" and / or the "male type" are preferably made of concrete, but may be made of metal or a composite synthetic resin material such as fiber reinforced plastic (FRP). In particular, it is preferable that the "male mold" is formed by pressing a foot against gypsum or the like to collect a toe pattern to manufacture a temporary formwork, and dropping a raw material such as concrete into the temporary formwork.

When clamping the mold, it is preferable to heat the female mold and / or the hollow resin filament with a heater, hot water, steam or the like under the temperature condition necessary for softening the hollow resin filament. . Further, it is preferable to trim the protruding terminal. After clamping the mold, it is preferable to cool the hollow resin filament to fix the spring characteristics. Cooling includes natural cooling or forced cooling, and cold water is preferably used for forced cooling.

According to this manufacturing method, it is possible to instantly perform three-dimensional measurement to molding, instead of the planar measurement of the foot mold by the scriber. Further, it becomes easy to manufacture a shoe sole or an insole that can meet the product characteristics and detailed needs.

According to the invention of claim 7, a predetermined bulk is formed by contact-entangled assembly of adjacent continuous filaments of hollow continuous linear filaments and / or short linear filaments or curls consisting of at least a thermoplastic resin. A method for producing a shoe sole or an insole using a hollow resin filament, which comprises pressurizing a three-dimensional structure having voids of a high density by directly or indirectly stepping on it with a foot and molding.

The term "indirectly" means that it is preferable to step on the hollow resin filament through a sock or a heat-resistant guard.
For example, in the case of a resin having a low softening point, it is preferable to collect the toe pattern by directly pressing the resin heated with a heater, hot water or steam with bare feet. On the other hand, in the case of a resin having a high softening point, it is preferable to indirectly press the heated resin with a sock or a foot equipped with a heat-resistant guard or the like. Thus, by directly or indirectly stepping on the foot, the load can be shared over almost the entire surface, and the surface pressure is reduced, which is preferable. At this time, similarly to the above, it is preferable to trim the protruding terminal. After clamping the mold, it is preferable to cool the hollow resin filament to fix the spring characteristics. Cooling includes natural cooling or forced cooling, and water is preferably used for forced cooling.

According to this manufacturing method, it is possible to instantaneously perform three-dimensional measurement to molding, instead of the flat measurement of the foot mold by the scriber. Also, no male mold is required. In particular, since it is possible to reproduce the details, it is possible to finely respond to an unspecified number of needs, such as molding an original product to suit the individual's feet, or to make a personalized product for the individual, and the added value of the product increases.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION First, the hollow resin filament 30 will be described. As shown in FIG. 1A, the hollow resin filament 30 used in this embodiment is made of a thermoplastic resin such as P.
Polyolefin resins such as E and PP, and VAC and EVA
Alternatively, a three-dimensional structure having voids formed by randomly entangling and collecting pipe-like continuous filaments and / or short filaments (hereinafter simply referred to as filaments 31) made of a mixture with SBS (for example, thermoplastic elastomer) as a raw material The body, this line 31
Form multiple loops or curls (Fig. 1
(See a partially enlarged view A of (a)). In the present embodiment, the filament 31 that constitutes the hollow resin filament 30 includes an air chamber 31a (see a partially enlarged sectional view B of FIG. 1A), and the air chamber 31
The air in a is pushed out by being pressurized from the outside, and sucked in by being depressurized (bellow phenomenon).

Here, the bulk density of this three-dimensional structure is
0.005-0.03 g / cm ³ , preferably 0.0
08-0.03 g / cm ³ , especially 0.01-0.03 g
/ Cm ³ is preferable. The porosity of this three-dimensional structure is 96 to 99%, preferably 97 to 99%.
%, Particularly preferably 97 to 98%.

Next, the cushion material 10 formed by compression molding the hollow resin filament 30 and used as the sole 12 or the insole 13 will be described. The cushion material 10 is manufactured by compression-molding a hollow resin filament 30 which is a three-dimensional structure formed by using the above mixture as a raw material, into an arbitrary shape as described later, and FIG. ) As shown in the side view of FIG.
Alternatively, it is preferably used as the insole 13 laid inside the shoe 11.

The cushion material 10 is a hollow resin filament 30.
Because it consists of, it has excellent breathability. For example, line 31
It is preferable that the air gap 31a in each line 31 is provided with air permeability, as well as the air gap formed by the line and line 31 is provided with air permeability.

When the cushion material 10 is stepped on (pressurized) with the foot 1, the air existing in the air chambers 31a in each line 31 and the line 31 and the space formed by the line 31 is stepped out. When the foot 1 is floated (decompressed), air is sucked into the air chamber 31a and the gap (bellow phenomenon). As a result, air convection occurs inside the cushion material 10, which causes replacement of the air inside the shoe 11 and can favorably promote ventilation inside the shoe.

Further, due to the bellows phenomenon, the cushion material 10 has a spring characteristic (air cushion function), and is excellent in shock absorption. In particular, by stepping on the cushion material 10 having an air cushion function, the back side (the sole 2) of the foot 1 is suitably massaged, so that it also has a swelling relief effect and a fatigue recovery effect, and is also suitable for long-term walking. Is.

Further, the spring characteristic of the cushion material 10 can be varied for each part depending on the density, material and / or wire diameter of the hollow resin filament 30. Also, by adjusting the stroke of the male mold during compression molding, the thickness of the cushion material 10 can be freely adjusted, and the cushion material 10 having different shapes or sizes can be molded. For example, by raising the heel portion 10a (for example, 3 cm),
You can also have the effect of making you look taller (Fig. 1
(See (b)).

As shown in FIG. 2 or 3, the cushion material 1
0 may be the sole 12 or the insole 13. Further, the cushioning material 10 may be used to configure the constituent parts of the shoe 11 other than the shoe sole 12 or the insole 13.

For example, as shown in the side sectional view of FIG. 2 (a), the cushion material 10 can be molded into the shape of the shoe sole 12 (portion to be the core). Further, as shown in the side sectional view of FIG. 2B, the entire shoe 11 may be formed of the cushion material 10 so as to cover the foot 1. At this time, the periphery of the cushion material 10 is covered with a coating 14 (for example,
In the case of leather shoes or the like, it is preferably covered with natural leather or artificial leather, or in the case of sneakers or the like). The coating 14 is preferably covered after the cushioning material 10 is molded.

Further, as shown in the perspective view of FIG. 3 (a) or FIG. 3 (b), it may be molded as an insole 13 laid in the shoe 11. When the insole 13 is used, it can be used as it is by simply laying it on the leather shoes, sneakers, etc. currently worn. In particular, when it is used as the insole 13, it is preferable that the dynamic friction coefficient is increased and the anti-slip property is improved so that the slip in the shoe 11 is reduced.

Needless to say, the cushion material 10 is not limited to the illustrated shape, and can be formed into an appropriate shape, and can be applied to footwear of various shapes. For example, the sneaker 111 shown in FIG. 4A, the western boot 211 shown in FIG. 4B, the deck moccasins 311 shown in FIG. 4C, and the snow shoes 41 shown in FIG. 4D.
Cushion material 11 so that it can be applied to various shapes such as 1.
It is possible to mold 0, 210, 310, 410.

Next, a change in sole pressure and a locus of force applied during general walking will be described, and the sole 12 of the present embodiment will be described.
Alternatively, the specific operation of the insole 13 will be described. As shown in the explanatory view of FIG. 5 (a), the sole 2 includes a part of the arch 3 such as the foot 3 and the toe 5 that comes into contact with the ground when standing or walking (shaded part in the figure) and the arch 4. And the like that do not come into contact with the ground (a portion other than the above-mentioned shaded portion). Here, as shown in the explanatory view of FIG. 5 (b), the part in contact with the ground (stepping part 3) is the front part of the foot (MP part), the center part of the foot (MID / FOOT part), and the heel part (HEEL). Part), and the MP part is further classified into three parts: inner side a, middle b, and outer side c. Also, in the toe part 5, the first toe is classified into an inner side a, the second toe and the third toe are classified into an intermediate b, and the fourth toe and the fifth toe are classified into an outer side c, and the part of the sole 2 that contacts the ground is classified. Total 8 divisions.

In the pressure distribution chart of FIG. 6, adult males 21-40
Aged 2 while walking 2 divided into 8 parts, maximum of each part
Average peak sole pressure (circle in the figure) and standard deviation (vertical in the figure)
Line). For example, the load pressure applied to the HEEL part is about
400-600g / cm^TwoWithin the range of 510
g / cm^TwoIndicates. Load pressure applied to MID / FOOT part
Power is about 260-420 g / cm^TwoIs in the range of
340 g / cm^TwoIndicates. Load applied to the inside a of the MP part
Pressure is about 310-590g / cm^TwoIs within the range of
Average 460 g / cm^TwoIndicates. Load on the middle b of MP part
Heavy pressure is about 430-590 g / cm^TwoIs within the range of
Average 510g / cm^TwoIndicates. Hanging on the outside c of MP
Loading pressure is about 260-480g / cm^TwoWithin the range of
Average 370 g / cm^TwoIndicates. Hanging on the inside a of the toe
Burden pressure is about 310-700g / cm^TwoWithin the range of
Yes, average 510 g / cm^TwoIndicates. In the middle b of the toes
The applied load pressure is about 260-510 g / cm^TwoWithin the range of
And an average of 380 g / cm ^TwoIndicates. Outside the toe c
The load pressure applied to is about 60-320 g / cm^TwoWithin the range of
And an average of 190 g / cm^TwoIndicates.

As is clear from the above results, the highest pressure is concentrated on the HEEL part, the inside a and the middle part b of the MP part, the inside a of the toe part 5, the MID / FOOT part, the outside c of the MP part, The pressure applied to the middle b and the outer side c of the toe part 5 is low.
Therefore, it can be seen that the pressure distribution on the sole is not constant.

Further, as shown in the explanatory view of FIG. 7, the force application point at the time of walking (for example, speed 1.32 m / s) starts from the central portion 2a of the heel, and is the third or fourth point as shown by the arrow in the figure. It quickly moves to the distal end 2b of the metatarsal bone, the moving speed decreases in the vicinity thereof, and at the same time the direction changes, and after moving slightly forward, it quickly moves in the direction of the first toe 2c.

As described above, the sole pressure and the point of force of application change as described above, but in the conventional general shoe sole 512 shown in FIGS. 8 (a) and 8 (b), the heel portion 512a and the front portion. The load is concentrated on the portion 512b, the pressure is not distributed to the arch portion 4 of the sole 2, and there is a disadvantage that fatigue easily occurs.

On the other hand, in the sole 12 or the insole 13 of the present embodiment, the cushioning material 10 fits on the entire surface of the sole 2 by being stepped on and receives the entire surface of the sole 2, so that the foot tread portion. Not only 3 but also the arch part 4 bears the load, and the surface pressure of the sole 2 is suitably reduced. For example, when the standing sole 2 is on the ground, a force equivalent to the force that the weight and the inertial force press the ground acts as a reaction force (floor reaction force) from the ground to the sole 2. Since the cushion member 10 absorbs the reaction force, fatigue is reduced. As described above, the cushion material 10 has not only an air cushion function but also a stress dispersion effect (stress escapement), so that it is very excellent in shock absorption. In addition, it is preferable that the cushion material 10 is appropriately formed with a raised portion so as to fit the arch portion 3 or the arch portion 4 of the sole 2 appropriately.

Next, a manufacturing apparatus and a manufacturing method of the cushioning material 10 of this embodiment will be described. The method of manufacturing the hollow resin filament 30 will be described later.

The cushion material 10 is the sole 12 or the insole 1.
Since it is used as No. 3, it is preferable to measure the foot pattern and collect the toe pattern here. Generally, in order to manufacture the shoes 11 and the like, as shown in FIGS. 9 (a) and 9 (b), the total length L _{1 of the} sole 2 from the second toe tip point 1a to the heel point 1b,
The ball width W from the inner midfoot point 1c to the outer midfoot point 1d,
Inner stepping length L ₂ from the medial midfoot point 1c to the heel point 1b, the length L _{3 of the} sole 2 from the heel point 1e to the heel point 1b, and the floor to the instep 6 at each site Heights (first toe joint height H ₁ , ball height H ₂ , foot height H _3, etc.) must be measured.

At this time, for example, as shown in the perspective view of FIG. 10, a scriber 7 or the like is used to imitate the second toe tip point 1a, the heel point 1b, the medial midfoot point 1c, the lateral midfoot point 1d, etc., and is planar. However, in the present embodiment, it is possible to instantaneously perform three-dimensional measurement to molding by the following method.

There are mainly two methods for manufacturing the cushion material 10 of this embodiment. One is to make a male mold 33 from the temporary mold 32 (see FIG. 11), and to make a male mold 33 and a female mold 34.
This is a method of manufacturing by compression molding (see FIG. 12). One is a method of directly or indirectly performing compression molding with the foot 1 instead of the male mold 33 (see FIG. 13).

First, in the compression molding method using the male mold 33 and the female mold 34, as shown in the side view of FIG. 11 (a), the foot mold is collected by pressing the foot 1 against an appropriate material such as plaster. Then, the temporary mold 32 of the male mold 33 is made. Figure 11
As shown in the side view of (b), the raw material 33a of the male mold 33 such as concrete is dropped into the temporary mold frame 32 from which the foot mold is sampled to be solidified, and the male mold 33 is separated from the temporary mold frame 32 to form the male mold 33. create. At this time, it is preferable that the temporary mold 32 is appropriately coated with a release material.

As shown in the side sectional view of FIG. 12A, the hollow resin filament 30 is placed on the female mold 34 and compression molded by the male mold 33 as shown by the arrow in the figure. In the present manufacturing method, since it is necessary to have a temperature equal to or higher than the softening point of the raw material resin forming the filament 31 of the hollow resin filament 30, the male die 33, the female die 34 and / or the hollow resin filament 30 itself. Is preferably heated. At this time, hot water (preferably 70 degrees or more)
Alternatively, heating with steam or the like is preferable. It is also preferable to embed a heat conductor (for example, a heater) in the male mold 33 or the female mold 34 to heat the same. In order to enhance the heat retention effect, it is also preferable to cover the periphery of the male mold 33 or the female mold 34 with a heat insulating material (for example, a container of wood, foamed resin, or the like).

The male mold 33 and the female mold 34 may be made of a metal such as iron or a composite synthetic resin material such as fiber reinforced plastic (FRP), but are preferably made of concrete. Since concrete is excellent in moldability and can be produced by simply kneading it and pouring it into a mold, the cost of the male mold 33 and the female mold 34 itself is reduced (for example, 1/50 to 1 of the conventional mold). / 100), the male mold 33 and the female mold 34 having a complicated shape can be manufactured, and the same product can be easily duplicated. Further, since concrete is easily adapted to a product, it is possible to form the cushion material 10 smoothly as if the surface of the cushion material 10 was polished by just clamping the mold. In addition, if concrete is used, the durability is high, such that it can suitably withstand the pressure applied during the molding of the cushion material 10. Also, when releasing,
When the male mold 33 and the female mold 34 are made of concrete, the raw material resin does not melt to adhere to the male mold 33 and the female mold 34, and the mold release agent is unnecessary.

The male die 33 is a hollow resin filament 3 formed by a pantograph jack, a hydraulic cylinder, a pneumatic cylinder or the like.
It is preferable to clamp 0 from above. The mold may be clamped by using the own weight of the male mold 33. When the mold is clamped, the density of the cushion material 10,
The spring characteristics, rigidity, etc. can be freely changed. Further, since the thickness and the like can be arbitrarily adjusted, it can be suitably made to order or the like, and can easily meet a large number of unspecified small needs.

After maintaining the mold clamping state for a predetermined time,
It is preferable to trim the burrs protruding from the end of the male mold and simultaneously heat-weld the ends by tracing the periphery of the male mold 33 with a heat cutter or the like. Trimming at this stage eliminates the unraveling of the terminal and eliminates the need for subsequent dimensioning, which simplifies the process. Then female mold 3
The hollow resin filamentous body 30 is solidified by, for example, pouring cooling water into 4. Although it may be naturally cooled, the molding time can be shortened by adding water and quenching. Then, as shown in the plan view of FIG. 12B, after the curing time has elapsed, the mold is released to obtain the cushion material 10.

In the method of directly or indirectly compression molding with the foot 1, as shown in the side view of FIG.
The hollow resin filament 30 is directly pressed with bare feet to apply pressure, collect a toe pattern, and perform compression molding. At this time, the hollow resin filament 30 is preferably heated with hot water, steam, a heater or the like. When stepping on with bare feet, it is preferable to use a synthetic resin having a low softening point as the raw material resin. On the other hand, if synthetic resin with a high softening point is used as the raw material,
As shown in the side view of FIG. 13 (b), the heat resistant guard 8 such as socks is attached to the foot 1, and the hollow resin filament 30 is indirectly stepped on to pressurize, collect the toeprint, and compress it. Molding is preferred. Others are almost the same as the manufacturing method of compression molding with the male mold 33 and the female mold 34, and thus the above description is incorporated.

Next, an example of a method of manufacturing the hollow resin filament 30 will be described. As shown in the schematic diagram of FIG.
In the method for manufacturing the hollow resin filament 30 according to the present embodiment, it is preferable that the polyolefin resin such as PE or PP and the raw material resin such as VAC, EVA or SBS are a tumbler, a cut-out feeder, or a fixed amount supply. Hopper 2 of the extrusion molding machine 20 after being dry blended through a machine or the like, or mixed or melt mixed and pelletized.
Sent to 1.

Specifically, raw material resins such as PP and S
BS with a tumbler (KR mixing machine manufactured by Kato Riki Seisakusho),
Mix for 15 minutes at 40 rpm.

Next, as shown in the perspective view of FIG. 15, the mixture made of this raw material resin is charged from the hopper 21 of the single-screw extruder 20 to a predetermined temperature (for example, 200 ° C. to 260 ° C.).
Melted and kneaded at a predetermined temperature, and melt-kneaded at a predetermined extrusion speed from a large number of nozzles of a predetermined diameter provided in the molding die 22, and then taken out by a take-up machine 23 described later to give a predetermined wire diameter (for example, 600 to 90, 000 denier, preferably 3,000 to 30,000 denier, more preferably
Hollow filament 31 of 6,000-10,000 denier
Is formed on the filament 31 in the molten state, for example, a diameter of 1
A random loop is formed by forming a loop having a diameter of -10 mm, preferably a diameter of 1 to 5 mm, and contacting and interlocking the adjacent filaments 31 in the bath 25 (in water). At this time, it is preferable that at least some of the contact entangled portions are melt-bonded to each other.

The thickness and bulk density of the three-dimensional structure which is a set of the above-mentioned random loops are set between the take-up rolls 24 of the take-up machine 23 in the bath 25. This three-dimensional structure (for example, thickness 10 to 200 mm, width 2,000 m
In m), the filaments 31 are randomly formed into curls or loops, solidified in water, and taken out as the hollow resin filaments 30 by the winding rolls 26, 26.

Further, when the filament 31 having the loop formed in water is pulled by the pulling machine 23, the cushion characteristic may be changed by changing the speed of the pulling machine 23. In that case, when relatively increasing the bulk density of this three-dimensional structure, 0.03 to 0.08 g / cm ³ , preferably 0.04 to 0.07 g / cm ³ , particularly 0.05.
It is preferable to set it to 0.06 g / cm ³ . Moreover, when reducing the porosity of this three-dimensional structure, 91-97
%, Preferably 92 to 96%, particularly preferably 93 to 94%.

Further, for example, the take-up rolls 24, 24
By adjusting the take-up speed of the take-up machine 23 to a low speed at a predetermined interval (for example, 3 to 5 m), for example, the take-up speed of the take-up machine 23 is set to a low speed within a set time by a timer or the like, and thus the hollow resin filament In the longitudinal direction of 30, a portion having a large bulk density formed at low speed pulling and a portion other than that, that is, coarse and fine may be continuously formed at predetermined intervals (for example, 30 to 50 cm).

By the manufacturing method described above, as an example, a hollow resin filament 30 having a bulk density of 0.03 g / cm ³ and a thickness of 50 mm was obtained. The three-dimensional structure can also be manufactured by using one or a plurality of combinations of different characteristics. In addition, regarding other details such as a manufacturing example and an experimental result of the hollow resin filament 30 molded by the above manufacturing method, Japanese Patent Application No. 2000-
See No. 246907.

[0065]

According to the invention described in claims 1 to 5, it is excellent in hygiene such as breathability and functional aspects such as stability and shock absorption, does not feel cramped, has little abrasion of shoes, and is worn. It is possible to provide a shoe sole or an insole that is comfortable and comfortable to walk at a low price. Specifically, (1) since the shoe sole or the insole using the hollow resin filament is provided with air permeability, the air in the shoe can be replaced, and the ventilation in the shoe can be suitably promoted. Excellent hygiene. (2) A shoe sole or an insole using a hollow resin filament is superior in terms of ventilation inside the shoe because air convection occurs inside, and also has cushioning characteristics (air cushion) for impact absorption. Are better. Also, by stepping on the air cushion, the sole of the foot is massaged properly,
It is also excellent in swelling relief and fatigue recovery effects. (3) A shoe sole or an insole using a hollow resin filament fits perfectly to the entire sole of the foot, and the load is also shared by the part of the arch so that the surface pressure of the sole is appropriately reduced. Stress dispersion effect (stress escapement) works, less fatigue, and excellent shock absorption. (4) A shoe sole or an insole using a hollow resin filament has a high dynamic friction coefficient and less slippage in the shoe, and is therefore excellent in slip resistance. (5) A shoe sole or an insole using a hollow resin filament is washable with water and dries quickly, which is excellent in hygiene. (6) Since the shoe sole or insole using the hollow resin filament can be freely shaped, it can easily meet various product requirements and characteristics, and it also responds to a large number of unspecified needs. It is possible, and the added value as a product becomes high. (7) For shoe soles or insoles that use hollow resin filaments, add a high amount of resin such as PE, which is a recycled resin for reuse of thermoplastic resin edible oil packaging containers and discarded agricultural plastic films. It can be regenerated as a valuable product and can be regenerated any number of times by remelting the cushion material itself made of a hollow resin filament. In this way, it is excellent in recyclability and is designed so as not to give a load to the environment after use. Moreover, since recycled resin can be used, it can be manufactured at low cost.

Further, according to the invention described in claims 6 to 7, a shoe sole or an insole using the hollow resin filament can be suitably manufactured. In particular, according to this manufacturing method, it is possible to instantly perform three-dimensional measurement to molding, rather than the flat measurement of the foot mold by the scriber. Also, the male mold can be dispensed with. Furthermore, since the details can be reproduced, the original value can be molded to suit the individual's feet, and it is possible to finely meet the unspecified number of small needs and the bespoke customized product for the individual, increasing the added value of the product.

The shape of the sole or the insole using the hollow resin filament in the present invention is not limited to the above, and various shapes can be adopted as long as they are within the technical scope of the present invention. Is. Further, fashionability can be added due to fashion (flow of time) and the like within a range not departing from the technical idea of the present invention, and modification and modification thereof are also included in the technical scope of the present invention. It will be.

[Brief description of drawings]

FIG. 1A is an explanatory view of a hollow resin filament 30.
(B) is a cushion material 1 as a sole 12 or an insole 13.
It is a side view of 0.

2A and 2B are side cross-sectional views of a shoe sole 12 or a shoe 11.

3 (a) and 3 (b) are perspective views of an insole 13. FIG.

4 (a), (b), (c) and (d) are plan views showing other forms of the cushioning material 10. FIG.

5 (a) and 5 (b) are explanatory views of the sole 2.

FIG. 6 is a chart showing pressure distribution on the sole 2.

FIG. 7 is an explanatory diagram showing a locus of force applied to the sole 2.

8A and 8B are a back view and a side view of a conventional shoe sole 512.

FIG. 9 is an explanatory diagram of a sole 2 and a foot 1.

FIG. 10 is a perspective view in the case of measuring a foot mold using a scriber 7.

11A and 11B are side views showing the manufacturing process of the male mold 33.

12A and 12B are a side sectional view and a plan view showing a compression molding step of the cushion material 10.

13 (a) and 13 (b) are side views showing another compression molding process of the cushion material 10. FIG.

FIG. 14 is a schematic diagram showing a step in a method for manufacturing a hollow resin filament 30.

FIG. 15 is a perspective view showing a method of manufacturing a hollow resin filamentous body 30.

[Explanation of symbols]

1 foot 2 sole 3 Arch part 4 Arch part 10 Cushion material 11 Shoes 12 Sole 13 Insole 14 coating 30 hollow resin filament 31 wire 31a air chamber 32 Temporary Form 33 Male 34 female

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D04H 1/70 D04H 1/70 Z (72) Inventor Yuichiro Nakamura Hofucho Motosu-gun Beppu 859 F-term ( Reference) 4F050 AA01 AA06 AA11 AA22 BA40 BA43 EA13 EA14 HA26 HA33 HA57 HA58 HA59 HA60 HA63 HA64 HA79 HA82 HA85 KA03 KA10 4L047 AB02 AB03 AB09 CA20 CB08 CC16

Claims (7)

[Claims] 1. A solid body having a void of a predetermined bulk density, which is formed by contact-entangled assembly of adjacent continuous filaments of hollow continuous filaments and / or short filaments of random loops or curls made of at least a thermoplastic resin. A shoe sole or an insole using a hollow resin filament, characterized in that the structure is formed by compression molding. 2. The shoe sole or insole using the hollow resin filament according to claim 1, wherein the three-dimensional structure has air permeability. 3. The hollow resin wire according to claim 1 or 2, wherein the three-dimensional structure takes out air inside by being pressurized and sucks air inside by being depressurized. Sole or insole using a strip. 4. The shoe sole or middle using the hollow resin filament according to claim 1, wherein the three-dimensional structure disperses a load and a floor reaction force over the entire sole. Floor. 5. The shoe sole or insole using the hollow resin filament according to claim 1, wherein the three-dimensional structure has a high dynamic friction coefficient. 6. A predetermined bulk formed by contact-entangled assembly of adjacent continuous filaments of hollow continuous filaments and / or short filaments of random loops or curls on at least a female mold. A method of manufacturing a shoe sole or an insole using a hollow resin filament, comprising placing a three-dimensional structure having a high density of voids, and clamping the three-dimensional structure with the female mold and the male mold. . 7. A solid body having voids of a predetermined bulk density formed by contact entanglement of adjacent continuous filaments of hollow continuous filaments and / or short filaments of at least a thermoplastic resin, or random loops of curls. A method of manufacturing a shoe sole or an insole using a hollow resin filament, which comprises pressurizing a structure directly or indirectly by stepping on it with a foot to form the structure.