JP3323479B2 - Felt sole for footwear and method of manufacturing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a felt bottom for footwear and a method for producing the same, and more particularly to a felt bottom suitable as an outer sole for footwear worn in a wet and slippery environment such as mountain stream fishing, surf fishing, snowy roads, and the like. Is provided.

[0002]

2. Description of the Related Art A felt bottom made by applying a needle punch to a laminate of synthetic fiber webs as an outer sole covering the entire sole of footwear such as shoes and underground socks worn during mountain stream fishing and surf fishing. It is known that compared to rubber, it is less slippery on wet scaffolds such as underwater and rocky places, and the fiber itself is hydrophobic and has low water absorption, and the structure is reticulated and has excellent water permeability. It is used habitually because it has features such as immediate drainage of water. However, the conventional felt bottom is inferior in durability because the surface fiber is easily broken and broken when stepping on a hard rock corner, and the ground contact surface is flat, so that the slip resistance is not sufficient.

[0003] Therefore, it has been proposed to plant a spike on the felt bottom. However, since the felt bottom is softer than the spike, there is a problem that the spike is loosened during use and easily comes off. And, when the hardness of the felt was increased, the felt bottom was hard to bend when walking, and it was difficult to walk. In addition, it has been proposed to form a recess by pressing a high-temperature metal rod exceeding the melting point of the felt bottom against the ground contact surface of the felt bottom, and at the same time, to melt and solidify the synthetic fibers on the surface of the recess (see Japanese Utility Model Application Laid-Open No. Hei 5-5-2). In this case, the concave portion and the surrounding synthetic fiber are less likely to be frayed, but the other flat portions are more likely to be frayed or worn as in the conventional case, and the concave portion is melted and solidified to thereby permit water permeation of the portion. In addition, the water absorption and dehydration of the felt bottom are deteriorated and the felt bottom is difficult to bend and it is difficult to walk, and the above-mentioned melt-solidified part shrinks, so that irregular wrinkles are formed and the appearance is deteriorated. There was a problem.

[0004]

SUMMARY OF THE INVENTION The present invention improves the slip resistance without planting spikes, increases the hardness without lowering the water permeability, improves the durability by preventing fraying, and improves the appearance. It is easy to bend and walk without lowering.

[0005]

According to the present invention, a felt bottom for footwear according to the present invention is made of felt containing ordinary synthetic fiber staples and heat-fusible fiber staples. The concave portion is formed in a pattern, and the contact portion between the staples is adhered by melting the heat-fusible fiber staple, and the whole shape of the felt bottom including the concave portion is fixed by the adhesion. It is characterized in that ordinary synthetic fiber staples form a porous network structure without melting and maintain the feel of felt.

According to a third aspect of the present invention, there is provided a card web including a normal synthetic fiber staple and a heat-fusible fiber staple having a melting point lower than that of the normal synthetic fiber staple. The above staples are entangled with each other by a needle punch, and compressed in the thickness direction to form a felt.Then, a hot press is performed to melt the heat-fusible fiber staples. By applying at a temperature at which it does not melt, the felt is formed in a pattern on one surface of the felt and is compressed in the thickness direction.

[0007] According to the above method for producing a felt bottom for footwear, a felt containing ordinary synthetic fiber staples and heat-fusible fiber staples is subjected to hot pressing, and a concave portion is formed on one side of the felt by the thermoplasticity of the synthetic fiber. In this hot pressing, the heat-fusible fiber staples are melted, and ordinary synthetic fiber staples are not melted. Therefore, when the contact portions of the staples constituting the felt move together with the hot press, the contact portions after the movement are bonded by the molten heat-fusible fiber staples. That is, by the thermoplasticity of the synthetic fiber staples and the above-mentioned adhesion, the felt is fixed in a form in which a concave portion is formed by hot pressing. In addition, since ordinary synthetic fiber staples maintain a fiber form without melting, the felt bottom constitutes a porous network,
Maintains the feel of the felt.

Accordingly, the felt sole for footwear according to the first aspect is manufactured by the above-described manufacturing method. In the above-mentioned manufacturing method, since the card web is laminated and needle-punched into felt, the staples constituting the card web are drawn in the thickness direction in the felt, whereby the staples of the upper and lower layers are mixed with each other. Intertwined,
The retracted staples clamp and compress the multilayer card web. Therefore, the obtained felt has improved peeling resistance and can be easily handled during hot pressing. Then, it is further compressed by a hot press, and a part thereof is particularly strongly compressed, so that the concave portion is formed in a pattern shape, and the staple is particularly strongly bonded at the bottom of the concave portion.

The obtained footwear felt sole has a concave portion provided on the ground contact surface and is partially thin, so that it has no concave portion and the whole is improved in slip resistance as compared with a thick material. It is easy to bend and walk. In addition, since the recesses are formed by hot pressing, the contact portions of the staples constituting the felt are adhered to each other, and the entire shape of the felt bottom including the recesses is fixed. And the durability is improved. Also, only the heat-fusible fiber staples are melted by the hot press, and ordinary synthetic fiber staples maintain a feel of felt by forming a porous network without melting. Therefore, it has breathability and water permeability as felt, water absorption when entering the water and good drainage when coming out of the water,
It is easier to walk.

The pattern shape of the concave portion is arbitrary, but the concave portion forms a groove in the width direction with respect to the felt bottom, and particularly, the concave portion forms a groove continuous in the width direction, the felt bottom is easily bent back and forth. Is preferred. In this case, the shape of the groove is not limited to a linear shape, but may be a bent line such as a mountain shape or a waveform, and a bent line-shaped groove is particularly preferable in that the slip resistance in the width direction is improved. If desired, grooves in the front-rear direction (length direction) may be added to form a grid pattern, in other words, portions other than the concave portions may be formed as a large number of island-shaped convex portions. The slip resistance is improved. In addition, the above concave portion is generally provided on the entire surface on the ground side,
Depending on the purpose, the front part, arch part, heel part, etc. can be arbitrarily selected and provided.

The above-mentioned ordinary synthetic fibers are ordinary thermoplastic synthetic fibers generally used for felt bottoms, and include fibers made of polypropylene, polyester, polyacrylonitrile and the like having a melting point of 160 ° C. or more. Polypropylene is preferred for its lightness, and polyester is preferred for its strength. In addition, the above synthetic fibers are formed in felt in the form of staples, the fineness of which is 2 to 40 denier, and the fiber length is preferably 30 to 80 mm, respectively.If the fineness is low, it is easily cut by friction,
If the fiber is too high, the rigidity becomes too large to make felt, and if the fiber length is short, the fibers are hardly entangled with each other and a card web cannot be obtained.If the fiber length is too long, it becomes easy to wind around the rollers. Felting becomes difficult.

The heat-fusible fiber used for bonding the synthetic fiber may be a fiber composed of only a synthetic resin (for example, polyethylene or modified polyester) having a melting point in the range of 90 to 190 ° C. and lower than the synthetic fiber. Alternatively, a composite fiber obtained by combining the low melting point synthetic resin with a relatively high melting point synthetic resin having a melting point of 160 ° C. or higher (for example, polypropylene, polyethylene terephthalate, etc.), similar to the above synthetic fibers, may be used. As the composite fiber, a side-by-side type composite fiber in which the above-mentioned high melting point resin (hereinafter, referred to as a high melting point component) and a low melting point resin (hereinafter, referred to as a low melting point component) are bonded in a bimetallic form, and the above-mentioned high melting point component And a sheath-core composite fiber having the above-mentioned low-melting-point component as a sheath component.

These heat-fusible fibers are also used in the form of staples, and their fineness and fiber length are preferably 2 to 40 denier and 30 to 80 mm, respectively, as described above. Can be easily mixed with synthetic fibers. In the above description, the melting of the heat-fusible fiber staple during hot pressing means that when the heat-fusible fiber staple is a conjugate fiber, only the low-melting-point component melts, It does not mean that the components melt. Then, the high melting point component forms the felt without melting like the above-mentioned ordinary synthetic fiber.

The heat-fusible fiber of the composite form is a fiber having the same length in the amount of the low-melting-point component which is about half that of the heat-fusible fiber having only the low-melting-point component (the component functioning as an adhesive). Because it is possible to uniformly disperse the low-melting-point component in the felt, the number of bonding points increases if the amount of the low-melting-point component used is the same, and it is difficult to form a large mass during melting. preferable. In particular, the core-sheath type conjugate fiber is particularly preferable in that the entire outer surface is formed of a low melting point component, so that the number of bonding points further increases.

The mixing ratio of the above-mentioned heat-fusible fiber staples is 3% by the ratio of the low-melting-point component to the total amount of fibers including ordinary synthetic fiber staples and the heat-fusible fiber staples composed of the high-melting-point component and the low-melting-point component. % Or more, especially 5 to 50%
Is preferred. If it is less than 3%, the fused portion is insufficient and the durability becomes insufficient. On the other hand, if it exceeds 50%, the fused portion becomes too large and the feeling of felt is lost, resulting in insufficient water permeability.

In the present invention, 20% or less of the above-mentioned ordinary synthetic fiber staple can be replaced with a hygroscopic fiber such as a cotton fiber or a wool fiber, and in this case, the slip resistance on a wet rocky place or a snowy road is improved. . However, the replacement amount is the above 20%
If it exceeds, the durability as a felt sole for footwear is undesirably reduced.

In the above-mentioned footwear felt bottom, the density of the ground portion other than the concave portion in the thick portion is 0.1 to 0.3 g.
/ Cm ³ is preferred, and if it is less than 0.1 g / cm ^3, it will be easily frayed and its durability will be reduced. Conversely, if it exceeds 0.3 g / cm ³ , it will be too hard and its water permeability will be reduced, making it difficult to walk. Become. The thickness of the thick portion is preferably 10 to 20 mm, and if the thickness is less than 10 mm, the durability is insufficient.
If it exceeds mm, the scaffold will be unstable due to rocky areas with many irregularities,
It becomes difficult to walk.

The above-mentioned ordinary synthetic fiber staples and heat-fusible fiber staples are blended by adding cotton fibers and wool fibers as required, and formed into a card web. The product is made into a felt and further subjected to a hot press to produce a product. The basis weight is preferably 1.0 to 4.5 kg / m ² . If the basis weight is less than 1.0 kg / m ² , the desired thickness and durability of the felt bottom cannot be obtained. If the basis weight exceeds 4.5 kg / m ² , the thickness of the felt bottom becomes excessive, and It becomes unstable and it is difficult to walk. Note that needlestick density in the needle punching is preferably from 50 to 170 present / cm ^2, felt becomes difficult to handle become entangled staple is insufficient at less than 50 lines / cm ^2, opposed to the 170 present / cm ² When it exceeds, the fiber breakage occurs, which is uneconomical.

The temperature at the time of hot pressing is such that the low melting point component of the heat fusible fiber staple is melted and the ordinary synthetic fiber staple (including the high melting point component when the heat fusible fiber is a composite fiber) is used. Set to a temperature that does not melt. The pressure and the pressing time at the time of hot pressing are such that the density and thickness of the felt bottom obtained by this hot pressing are 0.1 to 0.3 g / cm ³ and 10 to 20 mm, respectively, as described above. Is set to That is, the pressure is 200 to 1000
N / m ² and the pressurization time are preferably 3 to 10 minutes, respectively. If the pressure and pressurization time are insufficient, the density of the felt bottom is insufficient and the durability is reduced. Is hard and it is hard to walk.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 As a heat-fusible fiber staple, a core having a high melting point core of polypropylene (melting point: 160 ° C.) and a low melting point sheath component of polyethylene (melting point: 110 to 130 ° C.) Sheath type composite fiber staple (fineness: 2 to 40 denier, fiber length: 30
８０80 mm) and polypropylene fiber staples (melting point: 160 ° C., fineness:
2 to 40 denier, fiber length: 30 to 80 mm), and mixing ratio of the above-mentioned core-sheath type composite fiber staple and polypropylene fiber staple in a mixing ratio of 5/95 to 30/70 (however, mixing ratio of polyethylene which is a low melting point component) A card web is prepared by mixing cotton with 3 to 15% of the total fiber, and a large number of the webs are laminated to form a laminated web having a basis weight of 1 to 4.5 kg / m ^2.
１７０170 / cm ² ) to give a felt having a thickness of 15 to 25 mm.

The obtained felt is hot-pressed. However, the temperature is set to 120 to 150 ° C., at which the polyethylene melts and the polypropylene does not melt, and the pressure is set to 300 to 800 N / m ² . Then, in this hot press, a mold in which a number of grooves are cut in a straight line or a bent line shape (for example, corrugated or chevron) continuous in one direction is placed on a lower heating plate so that the surfaces of the grooves face upward. It is fixed on the mold, the felt is put on the mold, the upper heating plate is pressed on the felt, and after 3 to 6 minutes, the upper heating plate is raised to take out the product and cut into a desired shape. Thickness 10-2
A felt bottom for footwear having 0 mm and a depth of a groove (recess) of 1/3 to 2/3 of the above thickness is obtained.

An example of the resulting felt sole for footwear is shown in FIGS. 1 and 2, reference numeral 10 denotes a felt bottom for footwear, reference numeral 11 denotes a ground plane, and reference numeral 12 denotes a groove. In this example, many grooves 12 are continuous with the ground plane 11 of the felt bottom 10 in the width direction of the felt bottom 10. The shape of the felt bottom 10 is formed so as to be concave in the shape of a chevron or wavy bent line. The depth H of the groove 12 is set to 1/3 to 2/3 of the total thickness of 10 to 20 mm.

Embodiment 2 As a composite fiber staple, a core-sheath type composite fiber staple having a high melting point core component of polyethylene terephthalate (melting point: 260 ° C.) and a sheath component of modified polyester (melting point: 110 to 180 ° C.) (fineness: 3 to 20 denier, fiber length: 50
８０80 mm) and polyethylene terephthalate fiber staples (melting point: 26) as ordinary synthetic fiber staples
0 ° C, fineness: 3-20 denier, fiber length: 50-80m
m), a felt sole for footwear is obtained in the same manner as in the first embodiment, except that the temperature of the hot press is set to 120 to 200 ° C., which is a temperature at which the modified polyester melts and the polyethylene terephthalate does not melt.

[0024]

EXAMPLE The core component having a high melting point was polypropylene (melting point: 1).
60 ° C.) and a low melting point sheath component is polyethylene (melting point: 13
0 ° C) core-sheath type composite fiber staple (fineness: 32 denier, fiber length: 64 mm) and polypropylene fiber staple (melting point: 160 ° C, fineness: 18 denier, fiber length: 7)
6 mm) with a mixing ratio of 13/87 (provided that the mixing ratio with respect to all fibers of polyethylene alone, which is a low melting point sheath component, is 8).
%) To form a card web, and a large number of the webs are laminated to form a laminated web having a basis weight of 3.8 kg / m ^2. The laminated web is subjected to needle punching (needle piercing density 125 / cm ² ) to obtain a thickness. 16 mm felt was used. Next, a hot press was performed at a temperature of 150 ° C. and a pressure of 600 N / m ² for 5 minutes, and the groove 12 (depth: 5 mm) having a thickness of 13 mm, a density of 0.29 g / cm ³ and a waveform of FIGS. A felt sole for footwear was obtained.

The above footwear felt bottom was cut into a rectangle having a width of 100 mm and a length of 380 mm to obtain a test sample of the embodiment. The sample was tested for flexibility and slip resistance.
The performance was compared with a comparative example obtained in the same manner as in the above example except that the above-mentioned mold was omitted, and the results are shown in Table 1 below. The performance test was performed as follows.

Flexibility test One end (180 mm length) is placed on a horizontal base plate with the ground contact surface facing upward, and the other end (200 mm length) is projected horizontally. The sample is bent while a load of 500 gf is applied to the end, and the descent length (bending) of the protruding end is measured.

Anti-slip test Five types of boards were prepared: a plate, concrete without gravel (dry), concrete without gravel (wet with water), concrete with gravel (dry), and concrete with gravel (wet). A 5 kg weight is placed on the sample placed on the ground so that the ground contact surface is in contact with the sample, and the sample is pulled through a spring balance to measure the force when the sample starts to move.

Table 1

As shown in Table 1 above, the examples were more flexible than the comparative examples and were excellent in slip resistance. Also,
According to the wearing test, the felt bottom of the example is hard to slip as much as the conventional spiked one, especially in a rocky place having a lot of unevenness because the unevenness of the felt bottom meshes with the unevenness of the rocky place. In contrast, the comparative example had no meshing and was hard, so it was slippery and hard to walk. In both the examples and the comparative examples, fluff was generated by wearing, but in the example, since the groove bottom was particularly strongly compressed at the time of hot pressing, the pull-out of the fluff was short, and the fluff was easily cut off. In contrast to the length of 10 mm or less, in the comparative example, the draw-out of the fluff was long, and it was difficult to cut the fluff, the length was 30 mm or more, and the appearance was deteriorated.

[0030]

As described above, the felt bottom for footwear according to the first and second aspects of the present invention is more flexible and less slippery than the conventional felt bottom having no groove. It is easy to walk, hardly generates fluff, and has excellent durability. In particular, the invention according to claim 2 is easier to walk in the front-back direction than in the width direction, so that it is easier to walk. Also, the method for producing a felt for footwear according to the invention according to claims 3 and 4 can produce the felt sole for footwear described above,
In particular, the invention according to claim 4 can manufacture a felt bottom for footwear that is easier to walk.

[Brief description of the drawings]

FIG. 1 is a bottom view of a felt bottom for footwear.

FIG. 2 is a longitudinal sectional view of FIG.

[Explanation of symbols]

 10: Footwear felt bottom 11: Contact surface 12: Groove (recess) H: Depth

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A43B 13/22 A43D 25/06 A43D 86/00

Claims (4)

(57) [Claims] The staple is made of felt including ordinary synthetic fiber staples and heat-fusible fiber staples, and a concave portion formed by hot pressing is formed on the grounding surface side in a pattern. The whole shape of the felt bottom including the concave portion is fixed by the fusion of the fusible fiber staples, and the normal synthetic fiber staples form a porous network without melting, thereby forming a felt. Felt bottom for footwear, characterized by its texture. 2. The footwear felt bottom according to claim 1, wherein the concave portion is formed in a large number of linear or bent linear grooves continuous in the width direction of the felt bottom, and in the thick ground portion excluding the concave portion. A felt bottom for footwear having a density of 0.1 to 0.3 g / cm ³ and a thickness of 10 to 20 mm. 3. A plurality of card webs containing ordinary synthetic fiber staples and heat-fusible fiber staples are laminated, the staples are entangled with each other by a needle punch, and compressed in the thickness direction to form felt, and By applying a heat press at a temperature at which the heat-fusible fiber staples are melted and ordinary synthetic fiber staples are not melted, a concave portion is formed in a pattern on one surface of the felt and compressed in the thickness direction. Method of manufacturing felt bottoms for footwear. 4. The method of manufacturing a felt bottom for footwear according to claim 3, wherein the concave portion formed by the hot press is formed into a large number of linear or bent linear grooves continuous in the width direction of the felt bottom. The basis weight is 1.0-4.5 kg / m ² ,
A method for producing a felt bottom for footwear in which the pressure at the time of hot pressing is set to 200 to 1000 N / m ² .