JP5171174B2 - Leather sheet manufacturing method - Google Patents

Description

The present invention relates to a method for producing a leather sheet, and in particular, by attaching the back surface of a reptile skin or a bird skin and the surface of a pig suede with an adhesive, as if making a single piece of a reptile skin or a bird skin. The present invention relates to a leather sheet manufacturing method for manufacturing a leather sheet that is visible and the back surface of a pig suede is exposed.

  Conventionally, leather products such as clothing, folding bags, shoulder bags, handbags and other bags, wallets, key cases, business card holders and other bags (hereinafter simply referred to as “leather products”) are as follows. It is manufactured by the process as shown in FIG.

  1. For example, a leather product is manufactured by sewing a raw material (a constituent member or a part) of a leather product as it is without performing back-sticking after die-cutting the cow skin according to use.

  2. A material (components) made by sewing non-woven fabric, woven fabric or other lining to the back of leather such as cowhide that has been die-cut according to application, and then sewing the lining to the back of leather such as cowhide. Or leather parts are manufactured by sewing parts.

  3. A material made by attaching an adhesive with a leather, nonwoven fabric, woven fabric, foamed resin sheet such as urethane resin or silicone resin, or a combination of these to the back of leather such as cowhide that has been die-cut according to application Leather products are manufactured by sewing (components or parts).

As the adhesive, for example, a thermoplastic resin such as a polyamide resin, a polyester resin, a vinyl resin, an acrylic resin, or a polyethylene resin is used.
JP 2000-289142 A Actual registration No. 3009208 JP-A-63-202442 Japanese Patent Publication No. 140054 Japanese Patent Publication No.40459 Japanese Patent Publication No. 30-448 Japanese Patent Publication No. 15-6088 Japanese Patent Publication No.143183 Japanese Patent Publication No. 1133174 Japanese Patent Publication No. 36292

  By the way, for example, in a leather product using high-grade cowhide, the back surface is not backed due to the quality of the material (member).

  In addition, in the leather product market and the leather product market, there are leather products (so-called one-piece leather products) in which the back of the cowhide itself is exposed on the back of the leather product material (components or parts). It is treated as a luxury product.

  On the other hand, for example, leather products manufactured by sewing materials (components or parts) sewed on the back of the leather, or materials (components) bonded to the back of the leather using an adhesive Or, leather products manufactured by sewing parts) have a problem that a high-class feeling does not appear.

  In addition, a material (a component member or a material having a lining attached to the back surface of the leather using an adhesive made of a thermoplastic resin such as a polyamide resin, a polyester resin, a vinyl resin, an acrylic resin, or a polyethylene resin, for example. For leather products that have been sewn parts), for example, when the purchaser is using such a leather product, the leather and the lining may be separated. There is a sex problem.

  In addition, if the backing is attached to the back of the leather using an adhesive made of a thermoplastic resin such as a polyamide resin, a polyester resin, a vinyl resin, an acrylic resin, or a polyethylene resin, There are also manufacturing problems such as the formation of wrinkles on the skin and / or lining of the (component or part).

  In addition, bison and other snake skins, crocodile and other crusts, lizard skin and other crusts and other reptile skins, ostrich skins and other bird skins generally have such a characteristic that the back side of the skin is raised. Depending on the object, the raised part may be peeled off from the back side.

  For this reason, after cutting the reptile side and the bird skin according to the purpose, without using the backing, it is used as it is as a material (components or parts) for leather products, and the material is not backed. Leather products produced by sewing (components or parts) have a problem with the durability of the product for long-term use, for example.

  In this way, after the reptile side and bird skin are cut out according to the purpose, they are used as leather material (components or parts) as they are without being back-padded. For leather products manufactured by sewing materials (components or parts), for example, because there is a problem with the durability of the product for long-term use, leather products using reptile skin and bird skin are currently Due to the properties of the back surface, products manufactured by sewing materials (components or parts) obtained by sewing a lining or adhering to the back of the skin with an adhesive have been commercialized.

  However, even if it is a leather product using a reptile skin or a bird skin from a customer and / or a trader, a leather product that has a high-class feeling and the back surface of the skin itself is exposed (a so-called single-sheet leather) Such a leather product) has been desired for many years.

  The present invention has been made to solve the above problems, and is a leather product using a reptile skin or a bird skin, wherein the leather back surface is exposed (so-called one-piece tailoring). It is an object to provide a leather sheet suitable as a material (component or part) for producing a leather product having a high-grade feeling similar to that of a leather product and having excellent durability.

A leather sheet produced by the method for producing a leather sheet according to the present invention comprises a reptile skin or a bird skin and a pig suede, and the back surface of the reptile skin or the bird skin and the surface of the pig suede are attached with an adhesive. It is worn.

  Examples of reptile skin include crocodile skin and other crusts, lizard skin and other crusts, and examples of bird skin include ostrich skin.

  In addition, the term “pig suede” used herein is a pig skin (Pig Skin) using a sandpaper or a suede processing machine on the back side of pig skin (Pig Skin). It means a tanned leather with the velvet-like back side.

  The term “rubber-based adhesive” used in the present specification means an adhesive mainly composed of synthetic rubber or natural rubber.

  The rubber-based adhesive is not particularly limited in the following cases. For example, a latex air-drying adhesive in which synthetic rubber or natural rubber is dispersed in a colloidal solvent by an emulsifier is used. It can be mentioned as a preferred example.

The method for producing a leather sheet according to claim 1 includes a step of applying an adhesive to the back surface of a reptile skin or a bird skin, a step of applying an adhesive to the surface of a pig suede, and a step of applying a reptile skin or a bird skin. A step of attaching the back surface and the surface of the pig suede with a rubber adhesive applied to the back surface of the reptile skin or the bird skin and an adhesive applied to the surface of the pig suede.

  In addition, when applying an adhesive uniformly over the entire back surface of a reptile skin or bird skin, and when applying an adhesive uniformly over the entire surface of a pig suede, for example, brush, brush, hand roller Using a spray gun, a spreader, etc., it may be applied uniformly over the entire surface of the adherend (in this case, the entire back surface of the reptile skin or bird skin and the entire surface of the pig suede).

The method for producing a leather sheet according to claim 2 includes a step of applying an adhesive to the back surface of a reptile skin or a bird skin, a step of applying an adhesive to the surface of a pig suede, and a step of applying a reptile skin or a bird skin. When a thin skin is formed on the surface of the adhesive layer of the adhesive applied to the back surface and a thin skin is formed on the surface of the adhesive layer of the adhesive applied to the surface of the pig suede, the reptile skin is immediately formed. Or the process of sticking the back of the bird skin and the surface of the pig suede with the rubber adhesive applied to the back of the reptile skin or the bird skin and the adhesive applied to the surface of the pig suede Prepare.

Although not particularly limited to the following cases, in the method for producing a leather sheet according to claim 1 or 2 , the step of applying an adhesive to the back surface of the reptile skin or the bird skin is a reptile. Preferably, the adhesive is applied to the entire back surface of the skin or bird skin, and the step of applying the adhesive to the surface of the pig suede is performed on the entire surface of the pig suede. Is preferably applied.

The method for producing a leather sheet according to claim 3 is a rubber adhesive or an adhesive mainly composed of vinyl acetate used in the method for producing a leather sheet according to claim 1 or 2. is there.

The leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention is attached to the back side of the reptile skin or bird skin, and the surface side of the pig suede is adhered with an adhesive, so in this leather sheet, The back side of the pig suede is exposed.

Therefore, a leather product manufactured by sewing a material (a component or a part) obtained by cutting a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention for each application is used for the material (a component or a part). ) Have no seams such as reptile skin or bird skin and lining (pig suede), and the back of each of the materials (components or parts) is the back of pig suede ( As a result of the exposure of the velvet-like upside down side), the same luxury as a leather product (so-called single piece leather product) in which the back side of the leather itself is exposed to the customer or trader. Can be impressed.

  In addition, in the case of pork suede, the fluff is difficult to come off from the back of the velvet-like raised surface, so leather manufactured by sewing materials (components or parts) that are cut out of this leather sheet according to the purpose. The product is excellent in product durability against long-term use.

  In addition, the surface of the pig suede has fine wrinkles and pores inherent to the pig skin, and as described above, the back surface of the reptile skin or the bird skin has an uplifting character.

  As a result, when the back of the reptile skin or bird skin and the surface of the pig suede are attached with an adhesive, contact and wetting between the adhesive and the portion of the reptile skin or the back of the bird skin with a tangled character And the fitting structure of the surface of the surface of the reptile skin or bird skin that is raised up and the original fine skin wrinkles and pores on the surface of the pig suede, and the original fine skin wrinkles and pores As a result of cooperation between the contact with the adhesive and the wetting, the reptile skin or the bird skin and the pig suede are adhered to each other by the adhesive.

Therefore, a leather product manufactured by sewing a material (a component or a part) obtained by sewing a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention for each use is a backside of a reptile skin or a bird skin, The surface of the pig suede and the back of the skin that has been die-cut according to conventional applications in cooperation with an adhesive, non-woven fabric, woven fabric, foamed resin sheet such as urethane resin or silicone resin, or a combination of these Compared to a leather product manufactured by sewing a material (component or part) having a lining bonded with an adhesive, there is no separation between reptile skin or bird skin and pig suede.

That is, the leather product can withstand long-term use by sewing a material (component or part) obtained by die-cutting a leather sheet produced by the method for producing a leather sheet according to the present invention. have.

In the leather sheet produced by the method for producing a leather sheet according to the present invention, the back surface of the reptile skin or the bird skin and the surface of the pig suede are adhered by a rubber adhesive or an adhesive mainly composed of vinyl acetate. doing.

  Here, the rubber-based adhesive or the adhesive mainly composed of vinyl acetate has elastomeric properties (flexibility) after curing (after drying).

Therefore, for example, a leather product manufactured by sewing a material (component or part) obtained by sewing a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention for each application is subjected to external force. Even if the material (components or parts) is bent or twisted, each of the reptile skin or bird skin, rubber adhesive, adhesive based on vinyl acetate and pig suede can be deformed. , After curing the skin and skin (after drying), compared to leather products stuck using an adhesive that does not have elastomeric properties (flexibility), reptile skin or bird skin, and pig suede, Since it is not separated or difficult to separate, a leather product produced by sewing a material (a component or a part) obtained by cutting a leather sheet according to the present invention for each purpose is excellent in product durability against long-term use.

In the method for producing a leather sheet according to claim 1 , an adhesive is applied to the back surface of the reptile skin or the bird skin, an adhesive agent is applied to the surface of the pig suede, and the back surface of the reptile skin or the bird skin; Since the surface of the suede is pasted with the adhesive applied to the back of the reptile skin or bird skin and the adhesive applied to the surface of the pig suede, the back of the reptile skin or the bird skin Or reptile skin or bird skin and / or pig compared to a leather sheet in which adhesive is applied to either surface of pig suede and the back of reptile skin or bird skin and the surface of pig suede are pasted Suede is not easily wrinkled, so the yield is good and the adhesive strength between the back of reptile skin or bird skin and the surface of pig suede is high. Reptile skin or bird skin and pig suede are not separated or separated. It is hard to do.

Therefore, a leather product manufactured by sewing a material (a component or a part) obtained by sewing a leather sheet manufactured according to the method according to claim 1 for each purpose is used for long-term use. Is excellent.

Further, a leather product manufactured by sewing a material (component or part) obtained by sewing a leather sheet manufactured according to the method for manufacturing a leather sheet according to claim 1 for each use, includes the material (component). Or parts), and there is no seam that looks like sewed reptile skin or bird skin and lining (pig suede), and the back of each material (component or part) is made of pork suede Similar to leather products (so-called single-sheet leather products) where the back side of the leather itself is exposed to the customer or trader as a result of exposing the back side (the upscale back surface standing in a velvet shape) The impression of luxury can be impressed.

  In addition, in the case of pork suede, the fluff is difficult to come off from the back of the velvet-like raised surface, so leather manufactured by sewing materials (components or parts) that are cut out of this leather sheet according to the purpose. The product is excellent in product durability against long-term use.

  In addition, the surface of the pig suede has fine wrinkles and pores inherent to the pig skin, and as described above, the back surface of the reptile skin or the bird skin has an uplifting character.

Therefore, according to the method for manufacturing a leather sheet according to claim 1, when the back surface of the reptile skin or the bird skin and the surface of the pig suede are pasted with an adhesive, the back surface of the reptile skin or the bird skin seems to flutter. The contact and wetting of the part with the special character and the adhesive, the part of the character like the ridge of the back of the reptile skin or the bird skin, and the fine wrinkles and pores inherent to the pig skin existing on the surface of the pig suede Due to the cooperation between the combined structure and the contact and wetting of the fine fine wrinkles and pores inherent in the pig skin with the adhesive, the reptile skin or the bird skin and the pig suede are bonded by the adhesive.

That is, the leather product is separated from the reptile skin or the bird skin by sewing a material (component or part) obtained by punching the leather sheet manufactured according to the method according to claim 1 for each purpose. Therefore, it has the advantage that it can withstand long-term use.

Method for producing leather sheet according to claim 2 is provided with the same structure as the manufacturing method of the leather sheet according to claim 1, similar to the effect of the manufacturing method of the leather sheet according to claim 1 There is an effect.

  Here, the deposition time (also referred to as assembly time) when adhering the adhering material to each other using an adhesive is an adhesion work between the adhering material and the adhering material bonded together by the adhesive. Among them, it is an important factor related to the quality of the adhesive.

  More specifically, for example, wrinkles are not formed on the adherend due to the deposition time (also referred to as assembly time), and, for example, the adhesion strength between the adherend and the adherend is increased. Or influence.

In the method for producing a leather sheet according to claim 2 , an open deposition time is applied to a back surface of a reptile skin or a bird skin, and a rubber adhesive is applied to the surface of a pig suede. After applying the adhesive, a thin skin is formed on the surface of the adhesive layer of the rubber adhesive applied to the back surface of the reptile skin or bird skin, and the rubber adhesive applied to the surface of the pig suede The period until thin skin is formed on the surface of the adhesive layer, and immediately after the passage of this period (after passing), the back surface of the reptile skin or bird skin and the surface of the pig suede are immediately combined with the reptile skin or the bird skin. It is made to stick by the rubber adhesive apply | coated to the back surface of this, and the rubber adhesive apply | coated to the surface of pig suede.

That is, in the method for producing a leather sheet according to claim 2 , by setting the open deposition time (open assembly time) to an appropriate time, it is difficult for wrinkles to be formed in reptile skin or bird skin and / or pig suede. A product with a good yield, high adhesion strength between the back of reptile skin or bird skin and the surface of pig suede, and reptile skin or bird skin and pig suede are not separated or difficult to separate. There is a unique effect that a leather product with excellent durability can be produced.

In the method for manufacturing a leather sheet according to claim 3 , the back surface of the reptile skin or the bird skin and the surface of the pig suede are pasted with a rubber adhesive or an adhesive mainly composed of vinyl acetate.

  Here, the rubber-based adhesive or the adhesive mainly composed of vinyl acetate has elastomeric properties (flexibility) after curing (after drying).

Therefore, for example, a leather product manufactured by sewing a material (component or part) obtained by sewing a leather sheet manufactured in accordance with the method for manufacturing a leather sheet according to claim 3 according to the purpose of Even if the material (component or part) is bent or twisted, the reptile skin or bird skin, rubber adhesive and pig suede can be deformed, so after the skin and skin are cured The leather sheet according to claim 3 , wherein the reptile skin or the bird skin and the pig suede are not separated or difficult to separate compared to a leather product stuck using an adhesive having no elastomeric property. Leather products manufactured by sewing materials (components or parts) obtained by cutting a leather sheet manufactured according to the above manufacturing method according to the purpose of use have excellent product durability against long-term use.

Hereinafter, an example of a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention and an example of a method for manufacturing a leather sheet according to the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing an example of a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention .

  The leather sheet 1 includes a reptile skin (or bird skin) 2 and a pig suede 3, and a back surface S 2 a of the reptile skin (or bird skin) and a surface S 3 a of the pig suede 3 are attached by an adhesive. ing.

  Examples of reptile skin include crocodile skin and other crusts, lizard skin and other crusts, and examples of bird skin include ostrich skin.

  On the surface S2a of the reptile skin (or bird skin) 2, there is a beautiful scale pattern (in the case of bird skin, a protrusion pattern at the base of a feather).

  In addition, the back surface S2b of the reptile skin (or bird skin) 2 generally has a characteristic of standing up, and depending on the object, the raised portion may be peeled off from the back side. .

  Here, the pork suede 3 is tanned by using a sandpaper or a suede processing machine on the back side of the pig skin (Pig Skin), and the back side S3b of the pig skin (Pig Skin) standing in a velvet shape. Means skin.

  As the adhesive 4, one having flexibility after curing is used.

  More specifically, the adhesive is not particularly limited to the following cases, but it is preferable to use, for example, a rubber adhesive or an adhesive mainly composed of vinyl acetate.

  Since the leather sheet 1 is attached to the back surface S2b of the reptile skin (or bird skin) 2 by the adhesive 4 on the surface S3a side of the pig suede 3, the leather sheet 1 has the pig suede 3 on the back surface thereof. The back surface S3b side is exposed.

  As a result, the leather sheet 1 looks like a single reptile skin (or bird skin) 2.

  Moreover, since the pork suede 3 is difficult to remove fluff from the back surface S3b raised in the velvet shape, the leather product manufactured by sewing the material (component or part) obtained by cutting the leather sheet 1 for each application. The product has excellent durability against long-term use.

  Further, the surface S3a of the pig suede 3 has fine wrinkles and pores inherent to the pig skin.

  On the other hand, the back surface S2b of the reptile skin (or the bird skin) 2 has a characteristic of being raised.

  As a result, when the back surface S2b of the reptile skin (or bird skin) 2 and the surface S3a of the pig suede 3 are pasted with the adhesive 4, the back surface S2b of the reptile skin (or bird skin) 2 seems to be raised. The contact and wetting between the property portion and the adhesive 4, the surface portion of the reptile skin (or bird skin) 2 that is raised on the back surface S <b> 2 b, and the original fine skin of the pig skin that exists on the surface S <b> 3 a of the pig suede 3 Reptile skin (or avian skin) 2 by cooperation of the fitting structure with the wrinkles and pores and the contact and wetting of the fine wrinkles and pores inherent in the pig skin existing on the surface S3a of the pig suede 3 with the adhesive 4 Then, the pig suede 3 is bonded by the adhesive 4.

  Therefore, by sewing materials (components or parts) from which this leather sheet 1 is die-cut for each purpose, leather products can withstand long-term use because reptile skin or bird skin and pig suede 3 are difficult to separate. It has the advantage of being able to

Hereinafter, based on an experimental example, the leather sheet manufactured by the manufacturing method of the leather sheet concerning the present invention, and the manufacturing method of the leather sheet concerning the present invention are explained.

(Experimental example 1)
A crocodile skin was prepared as a reptile skin.

  In addition, pig suede was prepared as the lining for crocodile skin.

  Next, an adhesive for adhering (sticking) crocodile skin and pig suede was prepared.

  The composition of this adhesive is shown in Table 1.

However, each of chloroprene rubber, phenol resin, metal oxide, toluenecyclohexane, normal hexane, and methylene chloride contained in the adhesive contains chloroprene rubber content (% by weight), phenol resin content ( Weight%), metal oxide content (wt%), toluenecyclohexane content (wt%), normal hexane content (wt%) and methylene chloride content (wt%), respectively. Content (wt%) + phenol resin content (wt%) + metal oxide content (wt%) + toluenecyclohexane content (wt%) + normal hexane content (wt%) + chloride The methylene content (% by weight) was blended so as to satisfy the relationship of 100% by weight.

  As the metal oxide, magnesium oxide (MgO) or zinc oxide (ZnO) and a mixture thereof were used.

  Table 2 shows the properties of this adhesive.

Next, an adhesive having the composition shown in Table 1 and the properties shown in Table 2 was uniformly applied to the entire back surface of the crocodile skin.

  In addition, the surface opposite to the high-grade back of the pig suede velvet (hereinafter referred to as “the surface of the pig suede” is the surface opposite to the high-quality back of the suede velvet) The adhesive having the composition shown in Table 1 and the properties shown in Table 2 was uniformly applied over the entire surface.

  In addition, when the rubber adhesive is uniformly applied to the entire surface of the crocodile skin, or when the rubber adhesive is uniformly applied to the entire surface of the pig suede, for example, Using a brush, hand roller, spray gun, spreader, etc., apply evenly to the entire back surface of the crocodile skin and the entire surface of the pig suede.

  In this experimental example 1, using a brush, an adhesive having the composition shown in Table 1 and the properties shown in Table 2 was uniformly applied to the entire back surface of the crocodile skin, and the entire surface of the pig suede was applied. Table 1 was uniformly coated with an adhesive having the composition and Table 2 having the properties.

  In addition, before applying the adhesive to the surface of the pig suede, if necessary, for example, using a brush or the like, a solvent is used to remove dust, or to remove fats and oils, dyes, etc. on the surface of the pig suede. Degrease or even sandpaper.

  Further, before applying the adhesive to the back surface of the crocodile skin, for example, a brush is used to remove dust if necessary.

  In addition, when the back surface of the crocodile skin is easy to suck the adhesive, for example, the adhesive having the composition and the properties shown in Table 2 are applied twice in Table 1, or the back surface of the crocodile skin is The amount of adhesive to be sucked in is anticipated in advance, and the adhesive is applied slightly more than the amount of adhesive applied to the surface of the pig suede.

  Next, each of the crocodile skin with the adhesive applied to the back surface and the pork suede with the adhesive applied to the front surface is left for a while with the coating surface open, and the composition is shown in Table 1 and the composition in Table 2. The adhesive solvent (toluene, cyclohexane, normal hexane) exhibiting properties is volatilized (evaporated).

  The open deposition time is determined by applying an adhesive having the composition shown in Table 1 and the properties shown in Table 2 to the back of the crocodile skin, and the composition shown in Table 1 on the surface of the pig suede. And after applying an adhesive having the properties shown in Table 2 to the surface of the adhesive layer of the adhesive having the composition shown in Table 1 and the properties shown in Table 2 applied to the back surface of the crocodile skin. And a period until a thin skin is formed on the surface of the adhesive layer of the system adhesive having the composition shown in Table 1 and the properties shown in Table 2 applied to the surface of the pig suede.

  Next, immediately after this open deposition time (open assembly time) elapsed (after passing), the back of the crocodile skin and the surface of the pig suede were applied to the back of the crocodile skin. Table 1 shows the composition. And it sticks with the adhesive which shows the property in Table 2, and the adhesive which was apply | coated to the surface of pig suede, the composition is shown in Table 1, and the property is shown in Table 2.

  In addition, a thin skin was formed on the surface of the adhesive layer of the adhesive having the composition shown in Table 1 and the properties shown in Table 2 applied to the back surface of the crocodile skin, and applied to the surface of the pig suede. The point at which the thin skin is formed on the surface of the adhesive layer of the system adhesive having the composition shown in Table 1 and the property shown in Table 2 is, for example, applied to the back surface of the crocodile skin. On the surface of the adhesive layer of the adhesive showing the properties in Table 2 and on the surface of the adhesive layer of the adhesive showing the properties in Table 2 and the properties shown in Table 2 applied to the surface of the pig suede, For example, when an operator wears a rubber glove on a finger and presses the finger wearing the rubber glove, the adhesive does not thread on the finger wearing the rubber glove, and each adhesive layer In addition, the point of time when the pressed finger marks are a guide.

  Next, the crocodile skin and the pig suede are deposited for a predetermined time (until the adhesive dries) in a state where the surfaces to which the adhesive has been applied (the bonding surfaces) can be pressed together. Thus, a leather sheet in which the surface side of the pig suede was adhered to the back surface of the crocodile skin with an adhesive having the composition shown in Table 1 and the properties shown in Table 2 was prepared.

  For example, the pressing may be performed by pressing a crocodile skin and a pig suede on which the surfaces to which the adhesive is applied (bonding surfaces) are overlapped, or may be rolled by a hand roller. , Weights, sand bags, temporary nails, shavings, rubber rings, strings, wedges, adhesive tapes, spring plates (support bars), spiral jigs, press devices, etc.

  In Experimental Example 1, crocodile skin and pork suede were bonded to each other (bonded surface), and the pressing of the crocodile skin and pig suede was bonded to each other (bonded) The surface was overlapped by hand.

(Experimental example 2)
Except that the crocodile skin is replaced with the lizard skin, the same procedure as in Experimental Example 1 is used, and the surface side of the pig suede is attached to the back side of the lizard skin with an adhesive whose composition is shown in Table 1 and whose properties are shown in Table 2. A finished leather sheet was produced.

(Experimental example 3)
Except for replacing crocodile skin with ostrich skin, the same process as in Experimental Example 1 was performed, and the surface side of pig suede was attached to the back of the ostrich skin with an adhesive whose composition is shown in Table 1 and its properties are shown in Table 2. A finished leather sheet was produced.

(Experimental example 4)
Except that the adhesive is replaced with the adhesive having the properties shown in Table 3 below, the surface side of the pig suede is pasted on the back of the crocodile skin with the adhesive having the properties shown in Table 3 in the same process as in Experimental Example 1. A worn leather sheet was produced.

(Experimental example 5)
Similar to Experimental Example 1 except that chloroprene rubber, which is the main component of the adhesive whose properties are shown in Table 1 and whose properties are shown in Table 2, is replaced with natural rubber, except that an adhesive having the same composition and properties is used. In this step, a leather sheet was produced in which the surface side of the pig suede was adhered to the back surface of the ostrich skin with an adhesive having the composition shown in Table 1 and the properties shown in Table 2.

(Comparative Example 1)
Except for replacing the crocodile skin with cowhide, the surface side of the pig suede was attached to the backside of the cowhide with an adhesive having the composition shown in Table 1 and the properties shown in Table 2 except for the cowhide skin. A leather sheet was prepared.

(Comparative Example 2)
In the same manner as in Experimental Example 1, except that the adhesive having the composition shown in Table 1 and the properties shown in Table 2 was uniformly applied to the entire back surface of the crocodile skin, A leather sheet having a surface side adhered with an adhesive having the composition shown in Table 1 and the properties shown in Table 2 was prepared.

(Comparative Example 3)
In the same manner as in Experimental Example 1 except that the adhesive having the composition shown in Table 1 and the properties shown in Table 2 was uniformly applied to the entire back surface of the pig suede, A leather sheet having a surface side adhered with an adhesive having the composition shown in Table 1 and the properties shown in Table 2 was prepared.

(Reference Example 1)
Leather with Bond (registered trademark) 17Z adhered to the back of the crocodile skin on the back side of the pig suede in the same manner as in Experimental Example 1 except that Bond (registered trademark) 17Z was used as an adhesive. A sheet was produced.

(Reference Example 2)
A leather in which the surface side of the pig suede is adhered to the back surface of the crocodile skin with Bond (registered trademark) G clear in the same manner as in Experimental Example 1 except that Bond (registered trademark) G clear is used as an adhesive. A sheet was produced.

  Next, experimental example 1, experimental example 2, experimental example 3, experimental example 4, experimental example 5, comparative example 1, comparative example 2, comparative example 3, reference example 1 and reference example 2 were prepared as described above. The adhesion strength of each leather sheet was examined.

  First, for each leather sheet of Experimental Example 1, Experimental Example 2, Experimental Example 3, Experimental Example 4, Experimental Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, Reference Example 1 and Reference Example 2, T-shaped A peel test (JIS K 6854-3 (1999) Adhesive-peel adhesion strength test method-see Part 3) was performed.

  As a result, each of Experimental Example 1, Experimental Example 2, Experimental Example 3, Experimental Example 4 and Experimental Example 5 had a peel strength of 50 N / 25 mm or more, whereas Reference Example 1 and Reference Example 2 Each had a peel strength of 50 N / 25 mm ± 1.

  On the other hand, each of Comparative Example 1, Comparative Example 2 and Comparative Example 3 had a peel strength of less than 50 N / 25.

  In addition, each of the leather sheets of Experimental Example 1, Experimental Example 2, Experimental Example 3, Experimental Example 4, Experimental Example 5, Comparative Example 1, Comparative Example 2, Comparative Example 3, Reference Example 1 and Reference Example 2 is bent and bonded. A strength test (JIS K 6856 (1999) bending strength test method of adhesive) was performed.

  As a result, in each of Experimental Example 1, Experimental Example 2, Experimental Example 3, Experimental Example 4 and Experimental Example 5, no separation between the adherend and the adherend was observed, whereas Reference Example 1 In each of Reference Example 2, Comparative Example 1, Comparative Example 2, and Comparative Example 3, peeling between the adherend and the adherend was observed.

As is clear from each of Experimental Example 1, Experimental Example 2, Experimental Example 3, Experimental Example 4 and Experimental Example 5 described above, the leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention has its back side. In addition, the back side of the pig suede is exposed.

  Therefore, leather products manufactured by sewing materials (components or parts) obtained by die-cutting these leather sheets for different uses include reptile skin or bird skin on each of the materials (components or parts). There is no seam that looks like a sewed lining (pig suede), and the back of each material (component or part) is the back side of the pig suede As a result, the customer or the trader can be impressed with the same high-class feeling as a leather product (so-called one-piece leather product) in which the back surface of the leather itself is exposed.

  In addition, in the case of pork suede, the fluff is difficult to come off from the back of the velvet-like raised surface, so leather manufactured by sewing materials (components or parts) that are cut out of this leather sheet according to the purpose. The product is excellent in product durability against long-term use.

  In addition, the surface of the pig suede has fine wrinkles and pores inherent to the pig skin, and as described above, the back surface of the reptile skin or the bird skin has an uplifting character.

  As a result, when the back of the reptile skin or bird skin and the surface of the pig suede are attached with an adhesive, contact and wetting between the adhesive and the portion of the reptile skin or the back of the bird skin with a tangled character And the fitting structure of the surface of the surface of the reptile skin or bird skin that is raised up and the original fine skin wrinkles and pores on the surface of the pig suede, and the original fine skin wrinkles and pores As a result of cooperation between the contact with the adhesive and the wetting, the reptile skin or the bird skin and the pig suede are adhered to each other by the adhesive.

Therefore, a leather product manufactured by sewing a material (a component or a part) obtained by cutting a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention for each use includes a reptile skin or a bird skin, and a pig suede. There is no such thing as separation.

That is, the leather product can withstand long-term use by sewing a material (component or part) obtained by die-cutting a leather sheet produced by the method for producing a leather sheet according to the present invention. have.

Moreover, in the leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention, the back surface of the reptile skin or the bird skin and the surface of the pig suede are more specifically described in Table 1. The composition is bonded with an adhesive whose properties are shown in Table 2) or an adhesive mainly composed of vinyl acetate (more specifically, an adhesive whose properties are shown in Table 3).

  A rubber-based adhesive or an adhesive mainly composed of vinyl acetate has elastomeric properties (flexibility) after curing (after drying).

Therefore, for example, a leather product manufactured by sewing a material (component or part) obtained by sewing a leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention for each application is subjected to external force. Even if the material (components or parts) is bent or twisted, each of the reptile skin or bird skin, rubber adhesive, adhesive based on vinyl acetate and pig suede can be deformed. , After curing the skin and skin (after drying), compared to leather products stuck using an adhesive that does not have elastomeric properties (flexibility), reptile skin or bird skin, and pig suede, Since it is not separated or difficult to separate, a leather product produced by sewing a material (a component or a part) obtained by cutting a leather sheet according to the present invention for each purpose is excellent in product durability against long-term use.

  Further, in the method for producing a leather sheet according to the present invention, an open deposition time is applied, a rubber adhesive is applied to the back surface of the reptile skin or bird skin, and a rubber system is applied to the surface of the pig suede. After applying the adhesive, a thin skin is formed on the surface of the adhesive layer of the rubber adhesive applied to the back surface of the reptile skin or bird skin, and the rubber adhesive applied to the surface of the pig suede The period until thin skin is formed on the surface of the adhesive layer, and immediately after the passage of this period (after passing), the back surface of the reptile skin or bird skin and the surface of the pig suede are immediately combined with the reptile skin or the bird skin. It is made to stick by the rubber adhesive apply | coated to the back surface of this, and the rubber adhesive apply | coated to the surface of pig suede.

  That is, in the method for producing a leather sheet according to the present invention, the adhesive between the reptile skin or the bird skin and the pig suede is pasted together by setting the open deposition time (open assembly time) to an appropriate time. Sometimes it is difficult to erupt from the laminating surface, and at the same time, reptile skin or bird skin and / or pork suede is not easily wrinkled, so the yield is good and the back of reptile skin or bird skin and pig suede A unique effect that it can produce leather products that have high adhesive strength with the surface, reptile skin or bird skin, and pig suede that are not separated or difficult to separate, and that have excellent product durability for long-term use. Play.

In addition, the back surface S2b of the reptile skin or the bird skin 2 and the surface S3 of the pig suede 3 are adhered to the back surface of the reptile skin or the bird skin with a rubber adhesive. And, after applying a rubber adhesive on the surface of the pig suede, a thin skin is formed on the surface of the adhesive layer of the rubber adhesive applied to the back of the reptile skin or the bird skin, and The period until thin skin is formed on the surface of the adhesive layer of the rubber adhesive applied to the surface of the pig suede, and immediately after the passage of this period (after passing), the back of the reptile skin or bird skin The surface of the pig suede is pasted with a rubber adhesive applied to the back of the reptile skin or bird skin, and a rubber adhesive applied to the surface of the pig suede. Housed in a chamber) under reduced pressure (eg, 0.7 atmospheres or more) Preferably carried out at below .9 atm).
In order to ensure the flexibility of the adhesive, the amount of fibers (for example, fibers having a diameter of 15 μm or more and 70 μm or less and a length of 20 mm or more and 200 mm or less) in the adhesive in a range that does not impair the adhesive strength ( For example, it may be dispersed in an amount ranging from 1% by weight to 5% by weight.

Since the leather sheet manufactured by the method for manufacturing a leather sheet according to the present invention exposes the back side of the pig suede on the back surface , the leather sheet manufactured by the method for manufacturing the leather sheet according to the present invention is classified according to use. For leather products manufactured by sewing die-cut materials (components or parts), the back side of each pig suede (velvet-like high-grade feeling) on the back of each material (component or part) As a result of the exposure of the back side, the customer or the trader can be impressed with a high-class feeling like a so-called single piece leather product (a leather product with the back side of the leather itself exposed). High industrial applicability.

It is sectional drawing which shows typically an example of the leather sheet manufactured by the manufacturing method of the leather sheet which concerns on this invention .

Explanation of symbols

1 Leather sheet 2 Reptile skin (or bird skin)
3 Pig suede 4 Adhesive S2a Reptile skin (or bird skin) surface S2b Reptile side (or bird skin) back surface S3a Pig suede surface S3b Pig suede back surface

Claims (3)

Applying an adhesive to the back of the reptile skin or bird skin;
Applying an adhesive to the surface of the pig suede;
Adhering the back surface of the reptile skin or bird skin and the surface of the pig suede with an adhesive applied to the back surface of the reptile skin or bird skin and an adhesive applied to the surface of the pig suede A method for producing a leather sheet, comprising: a step. Applying an adhesive to the back of the reptile skin or bird skin;
Applying an adhesive to the surface of the pig suede;
A thin skin is formed on the surface of the adhesive layer applied to the back surface of the reptile skin or bird skin, and a thin skin is formed on the surface of the adhesive layer applied to the surface of the pig suede. Immediately after that, the adhesive applied to the back surface of the reptile skin or bird skin and the surface of the pig suede, the adhesive applied to the back surface of the reptile skin or bird skin, and the adhesive applied to the surface of the pig suede And a method for producing a leather sheet, comprising the step of adhering. The method for producing a leather sheet according to claim 1 or 2 , wherein the adhesive is a rubber adhesive or an adhesive mainly composed of vinyl acetate.