JPH06178703A - Shoe core material - Google Patents

Abstract

PURPOSE:To provide an inexpensive shoe core material by which time is not required for molding by a wooden pattern and which has uniform quality and by which a belt-like ear part to be fixed to the wooden pattern is not required to leave in the back skin when the instep is manufactured and a wrinkle or a loss or a sag is not created. CONSTITUTION:In a shoe core material 1 such as a moon pattern used in a curved part such as a heel part of a shoe, a base paper manufactured from wood pulp is impregnated with resin by a dipping system using an SBR latex as a compounding agent, and thermosetting adhesives 5 and 6 are applied respectively to the obverse and the reverse of a dried impregnated paper 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe core material, and more particularly to a core material used for the heel of a shoe.

[0002]

2. Description of the Related Art Generally, in leather shoes, a core material (moon type) for reinforcing the heel portion is interposed between an outer skin and a back skin. As shown in FIGS. 7 and 8, the core material 20 has a single-piece structure that conforms to the shape of the heel portion of the shoe, and the edge portions 21 and 21 at both ends of the shoe 20 from the bottom portion of the shoe to the top line (foot To the rear of the heel side toward the edge of the hole to be inserted)
Has an inclined triangular shape. Reference numeral 23 is a substantially V-shaped notch, which is formed to prevent the core material from overlapping at the relevant portion.

As the core material, in addition to rawhide called numerus tanned on the skin of animals such as cows, cardboard, cardboard, synthetic resin, or cloth impregnated with glue has been conventionally used. However, in order to make the heel look good and to fit the foot most, it has been said that the numer is the best.

[0004] However, conventional numers have poor elasticity, are weak against heat, have a bad odor, and are difficult to return to their original shape when the heel is stepped on. There was a defect that the oil did not seep out and stain the inner surface of the shoe. Moreover, shoes using numers are expensive.

[0005]

However, the lumber mold made of rawhide is soaked in water to be softened when it is molded with a heel wooden mold, and the lumber mold is left to stand for 2-3 days. Since it needs to be dried, and therefore it takes time to mold, and during that time the wooden mold cannot be used for other purposes, it cannot be mass-produced and is composed of natural materials.
There was the inconvenience that there were many variations in the product and many were of uneven quality.

Further, in the process of manufacturing shoes, the outer skin (outer skin) and the back skin (endothelium) are sewn together at the periphery of the hole for inserting the foot (referred to as the top line), and then the outer skin and the back skin of the heel portion are connected. When inserting a lunar mold between them and applying heat to the wooden mold to give the shape of a shoe and heat-treating it (referred to as "armoring"), thermosetting chemical bonding is applied to the front and back of the lunar mold. Since the agent is applied, sink marks, sagging, or wrinkles may occur on the epidermis or back skin after demolding.

The cause of such sink marks, sagging, or wrinkles is that since the heel of the wooden mold is round, the curvature of the back skin that adheres to the wooden mold and the curvature of the epidermis with the core material are different. Moreover, since the outer skin is made of a relatively hard skin material, while the back skin is made of a softer skin material than the outer skin, the expansion and contraction rates of both are different, and the adhesive of the same property is applied to both the front and back sides of the moon type. It seems to be in use.

However, since the sink mark, the droop, or the wrinkle cannot be corrected by a trowel or other device, the appearance of the shoe is significantly impaired, and accordingly, there is a loss that cannot be commercialized.

In addition, at the time of armoring, the back liner of the top line is projected to the outside of the epidermis to leave the band-shaped ears, and nails or pins for fixing the ears to the wooden pattern ( Since it is used for earrings), it is necessary to cut off the ears and shape the top line after demolding, but the top line most affects the appearance, so I was skilled in this work. Requires craftsmanship.

This work is an indispensable step in the current shoe manufacturing process. That is, when shaping with a wooden mold after the instep, satisfactory shaping could not be achieved unless a part of the outer skin or the back skin was fixed to the wooden mold.

Further, according to the conventional moon type, since the edge portions 20 at both ends are triangles having the upper edges 21 inclined toward the toe side, the back skin on the arch side of the foot is wrinkled during armoring. Since these wrinkles tend to be observed immediately from the outside, they are the cause of deterioration in the performance of shoes.

[0012] In view of the above circumstances, the present invention does not require much time for molding with a wooden mold, has a uniform quality, and, in addition, a part of the back skin for fixing to the wooden mold during armoring. Provided is an inexpensive core material which does not need to be left in a strip shape and does not cause wrinkles, sink marks or sagging.

[0013]

A shoe core material according to the present invention is a shoe core material such as a moon type used for a curved portion such as a heel portion of a shoe. It is characterized in that a thermosetting adhesive is applied to the front surface and the back surface of impregnated paper obtained by impregnating a resin-based synthetic latex compounding agent with a resin by a dipping method and drying it.

[0014]

According to the present invention, the moon mold can be used as it is as a core material for heels etc. if it is heat-molded by being sandwiched between the outer skin and the back skin and applied to the wooden mold without being dipped in water or dried.

When the thermosetting adhesives applied to the front surface and the back surface of the impregnated paper have different moisture contents, the adhered member mainly composed of the leather which comes into contact with the front surface is instantaneously changed. Even if adhered, the adherend that mainly comes in contact with the back surface is easily stretched by the water content of the adhesive and causes a time lag in the adhesion. I am absorbed. As a result, sink marks, sagging, or wrinkles do not occur in the surface skin and the back skin that sandwich the core material.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a core material 1 according to the present invention, and the core material 1 has a shape along the heel of a shoe. This core material 1 is made of impregnated paper, and is formed by molding the moon mold 2 shown in FIG. 2 and then molding it with a wooden mold. At the time of armoring, one surface having a high moisture content is in contact with the epidermis. The thermosetting adhesive 5 is applied, and the thermosetting adhesive 6 having a low water content is applied to one surface which comes into contact with the back skin and is dried. In addition,
The same thermosetting adhesive may be applied to both sides and dried.

The impregnated paper 3 is a pseudo-leather paper obtained by impregnating a base paper made from wood pulp into a SBR-based (styrene-butadiene-rubber) synthetic latex compounding agent with a resin by a dipping method and drying it. The impregnating agent is inserted between the entanglement of the fibers of the raw paper (raw paper) that has been formed into a fibrillated state to enhance the binding force and maintain the strength.

Therefore, the ability changes depending on the kind and amount of the impregnating agent in the molecular state. This component ratio is
Wood pulp (mainly virgin) is 70% to 78%, and the resin is 30% to 22%. The structure of the impregnated paper 3 is preferably a so-called two-ply (two-ply) structure with the adhesive 4 (FIG. 3), and therefore the thickness of one sheet suitable as a core material is preferably less than about 1 mm. Various measurement data of the impregnated paper 3 (measurement conditions: temperature 20 ° C., humidity 65%) are disclosed as an example at the end of this section.

As the thermosetting adhesive 5 having a high water content, cement (NVC-21: manufactured by Saiden Chemical Co., Ltd.) is used. Further, as the thermosetting adhesive 6 having a low water content, for example, counter cement or the like is used.

Cement (NVC-21) is mainly composed of modified starch and has a viscosity of 45,000 to 70,000 cp.
(30 ° C), PH 7.6-8.0, evaporation component (water) is 5
It is 3.0 ± 2.0 percent. And it can be diluted arbitrarily with water, has good adhesion and workability, has a fast drying rate, has a suitable flexibility, and has a low permeability to the skin,
It has the property of not easily becoming a stain.

A modified example of the moon type 2 is shown in FIGS. 5 and 6.
Shown in. The edge portion 12, 12 of both ends of this moon-shaped member 11 is formed in an inverted triangle. That is, the upper edge 13 of the edge portion 12 is inclined rearward on the heel side, contrary to the conventional example. The other structure is the same as that of the above embodiment. By molding such an edge portion 12, during armoring,
Wrinkles do not wrinkle on the back skin of the arch side of the foot.

The moon mold 2 is applied to a wooden mold or the like, pressed and heated to be molded, and after molding, thermosetting adhesives 5 and 6 are applied to both the front and back surfaces of the moon mold 2 and dried to obtain a product. It At the shoe factory, the commercialized core material 1 is sandwiched between the outer skin and the back skin of the heel part of the shoe (upper) that has not yet been attached to the sole, and the upper is put on the foot mold to produce about 60 feet.
The adhesives 5 and 6 are fixed by adhering the adhesives 5 and 6 to the surface skin and the back skin by heating and pressurizing (hot melt) at a temperature of about a degree.

The manufacturing process of the core 1 will be described. The moon mold 2 is punched out from the impregnated paper 3, the peripheral portion is made into a tapered cross section as shown in FIG. 3, and the moon mold 2 is applied to a wooden mold having a heel shape and heated and pressed to a predetermined shape (see FIG. 1). ), A thermosetting adhesive 6 having a low water content is applied to the surface of the impregnated paper 3 of the molded moon mold 2, and a thermosetting adhesive 5 having a high water content is applied to the back surface. The core material 1 is completed by applying and drying. Since this step is performed without immersing the moon mold 2 in water, it is completed in a very short time as compared with the conventional method.

Therefore, when the moon mold 2 is inserted during formation of the heel part of the outer skin and the back skin of the shoe at the time of making the shoe, and it is applied to the wooden mold and subjected to pressure / heat treatment, as shown in FIG. , Heating / pressurizing force F
While the back skin 7 is shaped so as to be in close contact with the wooden mold 8 and is instantaneously bonded to the impregnated paper 3 of the moon mold 2 and the peripheral portion 2a (Fig. 2) with the adhesive 6, the outer skin 9 is The adhesive 5 absorbs the water content of the adhesive 5 and is easily stretched.

Therefore, since the epidermis stretches and does not adhere to the moon mold 2 until the moisture evaporates, the epidermis 9 absorbs the sink marks, drips or wrinkles that may occur on the lining 7, while the epidermis 9 is being absorbed. It will be bonded to the moon mold 2 with a time lag from 7. Therefore, sink marks, sagging, or wrinkles do not occur on both the back skin 7 and the epidermis 9.

In particular, it was confirmed that wrinkles were not formed on the back skin of the arch side of the foot when the armor 11 having the inverted triangular edge portion 12 was used for the armoring, and the back seam in the lateral fishing process ( The bending adjustment of the center seam of the heel part) and the backing work in the fishing process could be performed in the same manner as in the current situation.

Although the core material 1 has been described as an example of being used as a core material for the heel of a shoe, it goes without saying that it can be used for a part other than the heel if necessary. It can be used for other things without limitation.

[0028]

[Table 1]

[0029]

According to the present invention described above, since the impregnated paper is used as the core material for the heel of the shoe, the quality of the impregnated paper can be kept constant, but the natural leather has many variations and the cost is low. It is a cheap and highly practical material compared to the one that leads to improvement.

Further, since the moisture contents of the adhesives applied to the front and back surfaces of the impregnated paper are made different, a thermosetting adhesive having a high moisture content is better than a thermosetting adhesive having a low moisture content. , Giving a large amount of moisture to the adherend to cause its elongation, and because the difference in moisture content causes a time difference in adhesion between the adherends on both sides, it may occur on the outer skin and back skin of the curved part of the shoe. It absorbs the sink marks, sagging, or wrinkles that it obtains, and does not cause sink marks, sagging, or wrinkling in the product shoe.

In particular, when armoring is performed by using a lunar mold having an inverted triangular edge portion, the back skin on the arch side of the foot does not wrinkle. Therefore, it is possible to omit the backing work in the current fishing process. In addition, the back seam bending adjustment performed in the horizontal fishing process can be done in the same way as the current situation,
The floor (sole) itself becomes hard. Thus, the shoe core material according to the present invention significantly improves the performance of the shoe as compared with the conventional one.

In addition, the core material is coated with a thermosetting adhesive, sandwiched between the outer skin and the back skin when applied to the wooden mold, and pressed and heated to bond the three members together, and Since it does not lose its shape even in a quick-drying and semi-dry state, it is not necessary to form earstops on the back skin, and no skilled earstop cutting work after shaping is required. Therefore, it is possible to omit the earstop work process and its workers, and it is easy to establish a mass production system.

It should be noted that the present invention is effective not only for natural leather but also for synthetic leather and cloth shoes.

[Brief description of drawings]

FIG. 1 is a perspective view showing a core material according to the present invention.

FIG. 2 is a development view of FIG.

3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is an explanatory view of a process of molding a heel portion of a shoe by using the core material (moon type) according to the present invention.

FIG. 5 is a perspective view showing another example of the core material according to the present invention.

6 is a development view of FIG.

FIG. 7 is a perspective view of a conventional example.

FIG. 8 is a development view of FIG. 7.

[Explanation of symbols]

 1, 11 ... Core material 2 ... Moon type 3 ... Impregnated paper 4, 5, 6 ... Adhesive

Claims (4)

[Claims] 1. A core material for a shoe, such as a moon mold, which is used for a curved portion such as a heel portion of a shoe, wherein a base paper made of wood pulp is
The R-type synthetic latex compounding agent is impregnated with a resin by a dipping method, and is dried, and
A core material for shoes, characterized by being coated with a thermosetting adhesive. 2. A thermosetting adhesive having a low water content is applied to one surface of the impregnated paper, and a thermosetting adhesive having a high water content is applied to the other surface. The core material for shoes according to claim 1. 3. The core material for shoes according to claim 2, wherein the thermosetting adhesive having a high water content is mainly composed of modified starch. 4. The core material for shoes according to claim 1, wherein the moon-shaped member has inverted triangular edges at both ends.