JPS6137294Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a laminated shoe cover, and more particularly to a laminated shoe cover that does not cause foot stuffiness, has an excellent texture, and is strongly bonded. A laminated shoe cover with outer fabric and lining fabric attached,
It is widely used mainly in high-quality shoes because it can accurately represent the shape of the foot and can maintain its shape for a long period of time. As the adhesive for bonding the outer fabric and the lining fabric, most commonly used is a rubber adhesive, which is affordable in consideration of price, adhesiveness, flexibility, etc. However, when rubber-based adhesives are used, the adhesive forms a film between the outer fabric and the lining fabric, which significantly reduces the breathability and moisture permeability of the shoe cover, making shoes made from that cover longer lasting. If you wear them for a long time and do strenuous exercise, they will get stuffy and damp, making them uncomfortable.
It was also a cause of athlete's foot. In an attempt to eliminate such defects, instead of a rubber adhesive that forms a film between the outer fabric and the lining fabric, a net-like adhesive 1 as shown in Figures 1 to 3 was used.
(For example, a net-like adhesive disclosed in JP-A-48-100245 is obtained by embossing one or both sides of a polyolefin resin film during melt molding and creating holes by biaxial stretching. Shoe coverings have been proposed in which a material (such as a lining material) is inserted between the outer fabric and the lining fabric and then bonded together. It is true that when a net-like adhesive 1 is used, air permeability and moisture permeability are improved due to the countless large gaps 2, and it is less likely to get wet during wear and is less likely to cause athlete's foot. The filament 3 of the net-like adhesive has a diameter of 50~
The filament 3 is 100 microns and quite thick.
This had the disadvantage that it was located between the laces and acted like a skeleton, impairing the flexibility of the laces, giving the wearer a stiff feeling and making them uncomfortable to the touch. Moreover, if the filament 3 is thick, the gap 2 will become too large if the amount of net material used is constant, and the gap between the net-like adhesive 1 formed by the filament 3 and the outer fabric will be increased accordingly. In order to avoid this, the amount of material used was reduced to 50g.
A net-like adhesive with an increased density of ~100 g/m ² has been used, which is uneconomical. The applicant has previously addressed the above-mentioned disadvantages, namely, that when a rubber adhesive is used, the breathability and moisture permeability of the shoe cover are significantly reduced, and the shoes manufactured using the shoe cover are not worn for a long time. If you wear the shoes and do strenuous exercise, they will get stuffy, making them uncomfortable and causing athlete's foot.Also, if you use a net-like adhesive 1 as shown in Figures 1 to 3, the flexibility of the shoes will decrease. In an attempt to overcome all of the disadvantages of the fabric, which gives a stiff feel and impairs the feel to the skin, and which is unsatisfactory in both adhesion and economy, the outer fabric and lining fabric are made of cotton-like synthetic fiber filaments with a diameter of 40 microns or less. 15-50
We proposed a laminated cover that is bonded with g/ ^m2 mixed entangled bodies. The above-mentioned entangled body proposed by the present applicant has extremely thin filaments of 15 to 50 g/ ^m2 ,
Since the filaments are mixed together in a cotton-like manner, they are highly breathable and moisture permeable due to the large number of gaps between the filaments, and even if you wear shoes made with these filaments and do strenuous exercise, they will not get stuffy. Without compromising comfort,
Since the tangled material is soft like cotton, the flexibility of the cover is not lost at all, and the surface area is large, so it is possible to firmly bond the outer fabric and the lining fabric with a small amount, which is not possible with conventional coats. I was able to overcome all my shortcomings. In this way, although the fabric laminated using the entangled body having the above-mentioned properties was able to sufficiently achieve the intended purpose, the pressing process of laminating the outer fabric and the lining fabric was difficult. At the same time, the cotton-like tangled material is compressed, and the actual amount used is small, and its existence can be ignored. It can be considered that the physical properties are exactly the same as the sum of the physical properties of the lining fabric, and therefore, it is possible to impart elasticity and thickness to the laminated cover that are greater than the sum of the properties of the outer fabric and the lining fabric. Therefore, it is not possible to impart a good texture (a feeling of plump volume, a heavy feel, etc.), and it is not necessarily satisfactory as a cover for high-quality shoes that are particularly rich in fashion. Nakatsuta. The present invention was devised in view of the above-mentioned circumstances, and the outer fabric and the lining fabric are made of an entangled body in which synthetic fiber filaments with a diameter of 40 microns or less are mixed in a cotton-like manner at 15 to 50 g/ ^m2 . In addition to the advantages of the pasted cover, such as good air permeability and moisture permeability, softness and touch, good adhesion, and economical use of small amounts, The purpose is to give the texture of
For this purpose, the outer fabric and the lining fabric are attached with an adhesive consisting of two layers, one of which is an open-cell foam-like adhesive layer that is in contact with the outer fabric surface, and the other layer is an adhesive layer that is in contact with the outer fabric surface. The problem was solved by providing a laminated shoe cover, which is an entangled adhesive in which synthetic fiber filaments with a diameter of 40 microns or less are mixed at 15 to 50 g/m ² in the form of cotton, in contact with the cloth surface. It is something. The entangled adhesive layer is flocculent as shown by 4 in FIGS. 4 to 6, and is made of ethylene monovinyl acetate copolymer,
Filament 3 made of polyurethane, polyethylene, polyamide, etc. with a diameter of 40 microns or less
50g/m ² is intertwined and mixed. The filament 3 is usually solid, but if a foaming agent is mixed in with it in advance, it will contain air bubbles 8 as shown in Figure 7, giving the filament great flexibility. It is more effective.
The entangled body 4 is located between the outer fabric and the lining fabric, and is heated,
After the two are pasted together by pressure, the thickness is negligible, at most 0.01 mm, because the cotton-like tangles are pressed together. The open-cell foam adhesive layer is made of natural rubber, styrene, butadiene copolymer rubber, polyisoprene rubber, polychloroprene rubber, acrylonitrile, butadiene copolymer rubber, ethylene, vinyl acetate copolymer rubber, with the required compounding agents added. Vulcanized foamed latexes are used, such as materials such as vinyl acetate, vinyl chloride copolymers, and materials copolymerized with other materials to impart special properties to these materials. When using latex as in the present invention,
The foaming ratio (the ratio of the volume before foaming to the volume after foaming) varies depending on the viscosity.
Generally, a latex with a high viscosity has a low foaming ratio, and a latex with a low viscosity has a high foaming ratio. Also, if the foaming ratio is different, the degree of clogging in the gaps between the fabric weaves will differ (this mainly affects air permeability and moisture permeability), and if the foaming ratio is high, it will be difficult to get stuck in the gaps between the fabric weaves, and small clogging will occur. Cheap. On the other hand, when the foaming ratio is high, the amount of lux that adheres to the cloth surface becomes small and the adhesive force becomes small, and when the foaming ratio is small, the amount of lux that adheres to the cloth surface becomes large and the adhesive force becomes large. Therefore, when selecting a latex, it is necessary to determine its viscosity while considering the above relationships. For example, using a latex with a viscosity of about 15,000 to 30,000 CPS is suitable for carrying out the present invention. At this time, if the viscosity is 15,000 CPS, the foaming ratio will be approximately 5 times, and if the viscosity is 30,000 CPS, it will be twice. If the foaming ratio is within this range, it will not clog the gaps between the fabric weaves of the commonly used fabric, and will provide sufficient adhesive strength to bond the outer fabric and the lining fabric together. In addition, when latex is used to obtain the open-cell foam-like adhesive layer as in the present invention, water contained in the latex may damage the covering material during the process of applying the foamed latex. There is a risk that the moisture will cause the product to shrink, making it impossible for the work to proceed smoothly. To avoid such troubles,
non-absorbent polyamide fiber, polyester fiber,
It is preferable to use polypropylene fibers or the like. As shown in FIG.
Before vulcanization, the cells 9 are in the form of closed cells, and each cell 9 is surrounded by a thin wall 10 that completely envelops the cells 9. As a result, a part of the thin wall 10, especially the upper part 11 and the lower part 12, is destroyed by an action similar to crushing action, and a communicating hole 14 is formed in the upper and lower parts as shown in FIG. 9, and the side part 13 remains. , the adhesive layer 15 becomes an open-cell foam adhesive layer as a whole. In the present invention, the thickness of the open-cell foam adhesive layer 15 produced at this time is the same as that of the entangled adhesive layer 15.
It is much larger, 0.05 to 0.1 mm. The laminated cloth of the present invention has a cotton-like synthetic fiber filament 3 with a diameter of 40 microns or less and a weight of 15 to 50 g/ ^m2.
The characteristics of the intertwined 4-form adhesive layer 16 are that it is highly breathable and moisture permeable, and does not get stuffy and make the wearer feel uncomfortable even when the shoes are worn together violently, and its existence can be ignored. Therefore, it does not impair the flexibility of the cover and has a wide contact area, so it naturally has the advantage of being able to firmly bond the outer fabric and lining fabric with a small amount. The layer 16 has a communication hole 14 on the upper surface, and
Since the open-cell foam adhesive layer 15, which leaves the side part 13 almost intact, is located between the outer fabric 5 and the lining fabric 6, it does not cause foot stuffiness, and moreover, the adhesive layer 15, which remains as a side wall, does not cause foot stuffiness. The side portions 13 act in the same way as a honeycomb core, giving elasticity and thickness to the cover, giving it a plump, voluminous feel, and a solid feel, resulting in a coat with a good texture. Therefore, it is possible to fully achieve the desired effect. The above-mentioned effects can be obtained by using the entangled body 4-like adhesive layer 16.
By locating the adhesive layer 15 on the lining fabric side and the open cell foam-like adhesive layer 15 on the outer fabric side, the flexible cotton-like material is closer to the skin surface and feels even better against the skin, while improving elasticity and thickness. Since the open-cell foam-like adhesive layer 15 is located closer to the outer surface of the shoe, it is possible to further express a plump and voluminous appearance, a heavy feel, etc., and the effects of the present invention. can be made more reliable. Example: An entangled body in which 35 g/ ^m2 of cotton-like polyamide filaments with a diameter of 1 to 40 microns were mixed was placed on a backing cloth (gins weave made of polyamide fibers), and the temperature
The two were fused together by heating under pressure from above and below at 160°C, pressure of 5 kg/cm ² , and time of 15 seconds. Since polyamide fibers were used as the backing fabric, a latex made by copolymerizing natural rubber latex with styrene and methyl methacrylate (both of which have good adhesion to polyamide fibers) was used. However, since both styrene and methyl methacrylate increase hardness, we investigated a copolymer latex that would not impair the texture of the garment.

[Table] Each copolymer latex above has a solid content of 52% in water.
%, foamed to about 3 times the initial volume, and placed on the surface of the entangled body fused onto the backing fabric so that the solid content was 150 g/m ² It was applied to. Overlay the outer fabric (cotton fiber ponzi weave) on top of this, heat at 120°C for 50 minutes,
The entire structure was heated under the condition of air pressure of 2.5 kg/ ^cm2 , the foamed latex was made into an open cell foam, and the outer fabric and lining fabric were laminated together. Copolymer latexes that could be used were determined. Here, it is known from experience that a good texture can be obtained when the stiffness is 14 to 20 cm, and the adhesive strength is 0.4 kg/cm or more when the peeling is 0.4 kg/cm or more. Samples 2 and 3 are suitable as polymer latexes. On the other hand, in these latexes, the viscosity determines the foaming ratio, and the foaming ratio affects the degree of clogging of the latex in the gaps between the fabric weaves and the adhesive strength. Check out,
Examples of latex formulations suitable for this example were investigated.
Here, fatty acid soap was used as a foaming agent, the solid content was adjusted to 52% with water, and each latex was foamed, and the entanglement was fused onto the backing fabric (polyamide fiber ginseng weave). It was applied to the surface to be combined at a solid content of 150 g/m ² , and a surface fabric (cotton fiber ponzi weave) was layered on top of this, and the temperature was 120°C, the time was 50 minutes, and the air pressure was 2.5 kg/m2. The whole was heated under the condition of cm ² to form the foamed entangled body into an open-celled foam, and the above-mentioned outer fabric and lining fabric were laminated together.

[Table] From the above table, it can be seen that viscosity and foaming ratio are inversely proportional, and when the foaming ratio is large, latex becomes difficult to clog in the gaps between the fabric weaves, and conversely, when the foaming ratio is small, it becomes easy to clog. However, when the foaming ratio is large, the adhesive strength decreases. From the above, it can be seen that, specifically, the purpose of this example can be achieved if the latex has a viscosity of 15,000 to 30,000 CPS. Therefore, from the measured values of each physical property in the above table, it is clear that Sample 2-1 and Sample 2-6 are foamed latexes suitable for this example. Among these, the latex of Sample 2-6 was selected and laminated as described above (this is the cloth of the present invention), and the backing fabric with no latex fused onto the backing fabric was used. All other materials and conditions were the same, i.e., the latex used.
The outer fabric, vulcanization conditions, etc. were the same as in the case of the coat of the present invention, and various physical properties were measured using a coat as a control example.

[Table] As shown above, the cover of this example showed the same values of adhesion, breathability, and moisture permeability as the cover of the control example, and it was found that the cover did not cause foot stuffiness and was excellent in durability. However, the texture is better than that of the comparison example, and it can be seen that the purpose of the present invention has been fully achieved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventionally proposed net-like film adhesive for shoe laces; Fig. 2 is a side view thereof;
3 is a sectional view taken along the line A-A in FIG. 1, FIG. 4 is a plan view of the entangled adhesive layer used in the present invention, FIG. 5 is an enlarged view of part B in FIG. 4, and FIG. The figure is a side view of figure 4, figure 7 is a filament containing bubbles, figure 8 is a side view of figure 4, figure 7 is a filament containing air bubbles,
9 is a sectional view showing an example of manufacturing the laminated shoe cover of the present invention, and FIG. 9 is a sectional view of the laminated shoe cover of the present invention. 1...Net-like film, 2...Gap, 3...
Filament, 4...entangled body, 5...outer fabric, 6...
...Lining fabric, 7...Cover, 8...Air bubbles in filament 3, 9...Air bubbles constituting the foamed latex, 1
0... Thin wall constituting foamed latex, 11...
The upper part of the thin wall 10, 12... Its lower part, 13... Its side part, 14... Communication hole, 15... Open-cell foam adhesive layer, 16... Entangled body 4-shaped adhesive.

Claims (1)

[Scope of utility model registration request] The outer fabric and the lining fabric are attached with a two-layer adhesive, one of which is an open-cell foam adhesive layer in contact with the outer fabric surface, and the other layer is in contact with the lining fabric surface. , a bonded heel cover for shoes, which is an entangled adhesive in which synthetic fiber filaments with a diameter of 40 microns or less are mixed in a cotton-like form at 15 to 50 g/m ² .