JPH01266284A - Production of leather-like moldings and transfer film used in production thereof - Google Patents

Abstract

PURPOSE:To obtain moldings for bowl for match, etc., extremely resemble to a natural leather in both of feeling and touch, by molding a transfer film consisting of a flexible film substrate, mold releasing layer, leather layer having printing layer such as pattern and adhesive layer and simultaneously bonding the leather layer to a panel, etc. CONSTITUTION:A mold releasing layer 14 and leather layer 8 obtained by forming a leather powder into a layer shape with a binder obtained by dissolving an urethane resin in an organic solvent and printing layer 5 forming character, pattern, etc., on the surface of the leather layer 8 are laminated on a flexible film substrate 13 of polyethylene terephthalate, etc., to give the transfer film 12. The transfer film 12 is arranged into a mold having a prescribed shape of cavity and heated and softened thermoplastic resin (e.g., polyvinyl chloride based resin or polyester based resin) elastomer is poured into the cavity, where the film 12 is molded and simultaneously the leather layer 8 containing printing layer 5 is bonded through the adhesive layer 23 to a panel body 7 and leather- like surface is formed to provide the leather-like moldings extremely resemble to a natural leather.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a leather layer molded article and a transfer film used in the manufacturing method.

<Prior Art> Conventionally, a technique for producing a leather layer molded product by mixing leather powder and a thermoplastic resin is known. (For example, JP-A-60-21
Publication No. 5875). The publication describes a technique for mixing leather powder and a thermoplastic resin, pelletizing it using a pelletizer, and manufacturing various molded products using extrusion molding, injection molding, etc., and supplying it as a plate-shaped material. In this case, a technique has been disclosed in which a roll member such as a mixing roll or a calendar roll is used to form a predetermined plate material.

Furthermore, Japanese Patent Publication No. 45-9619 discloses a transfer mark for printing on the surface of a rubber ball, and Japanese Patent Publication No. 49-26068 discloses a device for molding the outer layer of a ball by injection molding. There is.

<Problem to be solved by the invention>
When mixing leather powder and a thermoplastic resin and molding the mixture using, for example, an injection molding method, if the mixture is to have enough fluidity to be injection molded, the mixing ratio of the leather powder should be lower than that of the thermoplastic resin. (e.g. 10 to 30
weight%) must be set. However, at such a mixing ratio, the mixing ratio of leather powder is too low to obtain a molded article having a leather layer surface. In order to actually obtain a leather layer molded product, the mixing ratio of leather powder must be approximately 80% by weight.With such a mixing ratio, injection molding is impossible, and even if molded, the tear strength is In addition, the above-mentioned leather powder, which has the problem of deterioration of physical properties,
When a thermoplastic resin mixture is injected into a suitable mold and molded, a thin skin layer of thermoplastic resin is formed at the interface with the mold, making it difficult to obtain the surface of a natural leather layer. <Means for Solving the Problems> The method for producing a leather layer molded article according to the present invention includes a flexible film substrate, a release layer formed on the film substrate,
A transfer film consisting of a leather layer formed by layering leather powder with a binder on the release layer and an adhesive layer formed on the leather layer is placed in a mold having a cavity of a predetermined shape. step, injecting a heat-softened thermoplastic resin into the cavity, and simultaneously forming a molded body and adhering the leather layer to the surface of the molded body via the adhesive.

Further, the transfer panel according to the present invention includes a flexible film substrate, a release layer formed on the film substrate, a leather layer formed on the release layer with a layer of leather powder using a binder, and a layer on the leather layer. It consists of an adhesive layer formed on.

Effect> The transfer film in the present invention has a leather layer formed by layering leather powder with a binder, and when transferred to a molded object, has the effect of forming a leather layer on the surface of the molded object. Furthermore, when a printed layer with a predetermined pattern is formed on the surface of the leather layer, printing is simultaneously effected on the surface when the leather layer is transferred to the molded article.

Practical Examples The following describes the manufacturing method when the skin panel of a competition ball, such as a soccer ball, is used as the leather layer molded product.
An example will be explained.

1 and 2 show a soccer ball 1, which has a front panel 2, that is, 12 pentagonal panels and 2
Zero hexagonal panels are arranged so that their peripheries touch each other and are glued together. The periphery of the front panel 2 is formed to have a thin slope, and grooves 3 are formed at the joint portions of the front panel 2.

Reference numeral 4 denotes a recessed portion having a predetermined pattern such as a character, symbol, or pattern formed on the surface of the front panel 2, and a printed layer 5 having the same pattern is formed within this recessed portion 4. Note that the recesses 4 and the printed layer 5 are formed depending on the use of the molded article and are not necessarily necessary.

Numeral 6 denotes a large number of protrusions formed at predetermined intervals on the back surface of the front panel 2, which increase the flexibility of the front panel 2 and reduce its weight.The front panel 2 has a hardness (J
IS) A panel body 7 made of a thermoplastic polyvinyl chloride elastomer having a molecular weight of about 60 to 85, a leather layer 8 formed of a layer of leather powder coated on the surface of the panel body 7 with a binder, and the leather It consists of the aforementioned printed layer 5 formed in a predetermined pattern on the surface of M8. The polyvinyl chloride thermoplastic elastomer material forming the panel body 7 is as follows:
Sumiflex (registered trademark) or Sumicon (registered trademark)
(both manufactured by Sumitomo Bakelite ■), Sunbrain (registered trademark) (manufactured by Mitsubishi Kasei Vinyl ■), Aron Elastomer A
E (registered trademark) or Aron NP (registered trademark) (both manufactured by Toagosei Kagaku Kogyo ■), etc. can be used. The thickness of the panel body 7 is suitably between about In and 3-m. Leather powder is
Horse,.

Natural leather from cows, etc., is dried and ground into a fine powder of approximately 30 to 400 meshes.

As a binder for this leather powder, a binder prepared by dissolving a urethane resin in an organic solvent such as methyl ethyl ketone (MEK) or l-toluene to form a liquid can be used. That is,
Approximately 50 to 100 parts of the liquid binder is mixed with 100 parts of leather powder, formed into a layer with a thickness of approximately 10 to 200 μm, and the solvent is evaporated to form the leather powder with urethane resin. A bonded leather layer 8 is formed. After evaporating the solvent, the urethane resin in this liquid binder is mixed with 100% of leather powder.
part to about 5 to 20 parts. Urethane resin has excellent abrasion resistance, so it is effective for use in pole skin panels. In addition, thermoplastic resins such as polyvinyl chloride can also be used as the binding material. In this case, approximately 5 to 20 parts of a softened or melted thermoplastic resin is kneaded with 100 parts of leather powder to form a layer. The leather layer 8 may further contain short fibers made of natural fibers such as cotton or chemical fibers such as polyester. The appropriate mixing ratio is, for example, 5 to 10 parts of short fibers per 100 parts of leather powder. By incorporating this short fiber, it is possible to improve the hand feel and the warm feeling.

The surface of the leather layer 5 can be coated with this to form a pseudo-grain surface layer. This pseudo-grain surface layer is made of a thermoplastic elastomer such as urethane resin, and its thickness can be set in a range of about 5 to 20 microns, and optimally about 10 microns. By forming this pseudo-grain surface layer made of thermoplastic elastomer, it becomes more similar to natural leather. The amount of lubricant to be mixed is kept to a minimum. Reference numeral 9 indicates a rubber intermediate layer to which the surface panel 2 is adhered, 10 indicates a thread-wound reinforcing layer, and 11 indicates a rubber tube in which air is sealed at a predetermined internal pressure. Air is injected into this tube 11 through a pulp (not shown). Each of the above parts constitutes a ball base. As the ball base, a single tube made of a thermoplastic elastomer having a reinforcing function, such as Hytrel (registered trademark), can also be used.

FIG. 3 shows a transfer film 12 for printing on the front panel 2.
13 is a flexible film substrate made of a polyethylene teretaphthalate film with a thickness of about 25 to 50 μm, and 14 is a release layer with a thickness of about 1 to 20 μm deposited on the film substrate 13. , made of acrylic resin or urethane resin. In particular, if the mold release layer 14 is formed of urethane resin, that is, urethane resin that is a thermoplastic elastomer, and this mold release layer 14 is fixed to the leather layer 5, it will soften during thermal transfer and the leather layer 5 will be
It penetrates into the skin and functions as a pseudo-grain layer similar to the grain layer of natural leather. In this case, the release layer 14 is preferably thicker than before, for example, about 5 to 20μ, optimally about 10μ. 5 indicates a predetermined pattern such as letters, symbols, patterns, etc. formed to a thickness of about 1 to 40 mm
In the above-mentioned printing layer of μ, a pigment of a predetermined color, for example, black, is impregnated with a dye of the same color. This printing layer 5 is formed depending on the type of molded product, its use, etc., and is not necessarily necessary. 8 is the aforementioned leather layer formed covering the printing layer 5 and the mold release layer 14, As mentioned above, it is formed in a layered manner using a binder made of urethane resin or polyvinyl chloride resin.

A specific pigment or dye can be added to the leather layer 8 to give it a certain color.

Reference numeral 23 denotes an adhesive layer formed by covering the leather layer 8, and a urethane-based or vinyl-based heat-sensitive adhesive can be used.Next, the formation of the surface panel 2 using the transfer film 12 will be explained.

As shown in Fig. 4, first, cavity 1 in the shape of surface panel 2 is formed.
A pair of molds 16, 17 having 5 are prepared. An injection hole 18 is formed in one of the molds 17 . Mold 16
．． 17 is in a separated state, and the transfer film 12 is positioned between both the molds 16 and 17. At this time, the film substrate 13 of the transfer film 12 is located on the inner surface of the cavity 15 of the mold 16. A convex portion 19 is formed in the cavity 15 in correspondence with the printed portion, and the printed layer 5 of the transfer film 12 is located in this convex portion 19. Further, the inner surface of the cavity 15 of this mold 16 is subjected to a texture treatment to form minute irregularities.

Thus, the pair of molds 16 and 17 are overlapped and clamped, the nozzle 20 is applied to the injection hole 18, and the temperature is about 200°C.
The thermoplastic elastomer 21 softened by heating is injected into the cavity 15.

The transfer film 12 is pressed against the inner surface of the cavity 15 of the mold 16 by this injection pressure, and the leather layer 8 including the printed layer 5 is adhered to the molded panel body 7 via the adhesive layer 23.

After molding, the mold 16,17 is split and the front panel 2 is removed. When forming the panel 2, since the transfer film 12 is extremely thin, the minute irregularities formed on the surface of the cavity 15 of the mold 16 appear as they are on the surface of the front panel 2, and as a result, the surface of the front panel 2 is textured. A fine uneven pattern similar to the leather surface is formed.

In the surface panel 2 formed as described above, as shown in FIG. do. The depth of this colored area reached about 0.31 square meters in about 10 days after molding. Moreover, this >H3 direction corresponds to the downward direction in the figure, and there was a tendency for less penetration in the lateral direction. This means that printing bleeds are small, which is significant for the present invention.The polyvinyl chloride thermoplastic elastomer used to infiltrate the above dye is Sumicon (registered trademark) RMT series (Sumitomo Bakelite Co., Ltd.) was used.

The surface panel 2 thus formed is adhered to the surface of the ball base via an adhesive to complete the ball.

In the above embodiments, the panel body 2 is made of a polyvinyl chloride thermoplastic elastomer. In addition, polyester thermoplastic elastomers such as Hytrel (registered trademark) (manufactured by DuPont, East), Perbrene (registered trademark), etc. have been described. Trademark) (manufactured by Toyobo IJI), urethane thermoplastic elastomer such as Bandex (registered trademark)
(manufactured by Dainippon Ink and Chemicals) Elastran (registered trademark) (manufactured by Nippon Nistran), olefinic thermoplastic elastomers such as Sumitomo TPE (manufactured by Sumitomo Chemical), Milastomer (registered trademark) (manufactured by Mitsui Petrochemical Industries) ), styrenic thermoplastic elastomers such as Toughblane (registered trademark) (manufactured by Asahi Kasei Corporation) and Turublane-T (registered trademark) (manufactured by Nippon Elastomer ■) can be used, and these materials also have surface friction suitable for competition balls. and durability were obtained.

In addition, the leather layer provides a good texture, feel, and warmth, making it possible to create a soccer ball that is comfortable to the hands and legs. In the above embodiments, the present invention was explained with reference to an example in which it was applied to the production of a skin panel for a soccer ball, but it is not limited to this, and is applicable and useful in the production of other molded products, such as interior materials for automobiles, bags, etc. It is.

<Effect of the invention> According to the present invention, the following effects can be achieved.

(a) A leather layer and, if necessary, a printing layer are formed on the transfer film, and with this layer placed in a predetermined mold cavity, a thermoplastic resin is injected, and the leather layer ( and printed layer) to the surface. Therefore, forming the surface of the leather layer (and printing) at the same time as forming the main body.
It can be performed.

(b) The leather layer is a mixture of leather powder and binder in an optimal ratio to form the surface of the leather layer.In other words, this mixing ratio is subject to restrictions due to molding conditions such as fluidity during molding of the compact. Since there is no leather, it is possible to form a surface that closely resembles natural leather, and it is possible to maximize the improvement in feel, texture, warmth, etc.

(c) The molded body can be formed by resin injection molding such as injection molding, and the body does not contain leather powder that would inhibit its fluidity, so it is easy to manufacture the molded body with high dimensional accuracy. can. As a result, leather powder seen in conventional examples,
The problem of poor flowability during injection molding or extrusion of thermoplastic mixtures is eliminated.

(d) Since the molded product is divided into the leather layer forming the surface and the molded product body, the characteristics of each can be fully utilized independently. In other words, the leather layer can be given the feel, texture, and appearance of leather, and at the same time, the main body can be given properties such as physical strength depending on the intended use.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the surface shape of a soccer ball to which a skin panel manufactured according to an example of the present invention is adhered, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a transfer A sectional view of the film, FIGS. 4 and 5 are sectional views showing the mold, and FIG. 6 is a sectional view showing the main parts of the front panel.

Claims (12)

[Claims] (1) A flexible film substrate, a release layer formed on the film substrate, a leather layer formed on the release layer using a binder layer of leather powder, and an adhesive formed on the leather layer. Step of placing a transfer film consisting of a layer in a mold having a cavity of a predetermined shape; injecting a heat-softened thermoplastic resin into the cavity, and at the same time molding a molded product, the adhesive layer is placed on the surface of the molded product. A method for manufacturing a leather layer molded article, comprising: adhering the leather layer via the step of bonding the leather layer. (2) The method for manufacturing a leather layer molded article according to claim 1, wherein the leather layer has a printed layer having a predetermined pattern such as a character symbol or a pattern formed on the surface of the leather layer. (3) The method for producing a leather layer molded article according to claim 1, wherein the leather layer has a pseudo-grain layer formed by covering the surface of the leather layer. (4) The method for producing a leather layer molded article according to claim 3, wherein the pseudo-grain surface layer is made of a thermoplastic elastomer. (5) The method for manufacturing a leather molded article according to claim 1, wherein the leather layer is formed by mixing short fibers of natural fibers or chemical fibers in addition to natural leather powder. (6) Claim 1, wherein the binder is a binder formed in a liquid form by dissolving urethane resin in an organic solvent.
The method for producing the leather layer molded product described above. (7) The thermoplastic resin is one selected from the group consisting of polyvinyl chloride thermoplastic elastomer, polyester thermoplastic elastomer, urethane thermoplastic elastomer, olefin thermoplastic elastomer, and styrene thermoplastic elastomer. 2. The method for producing a leather layer molded article according to claim 1, wherein the leather layer molded article is made of an elastomer. (8) A flexible film substrate, a release layer formed on the film substrate, a leather layer formed in a layered manner with leather powder on the release layer using a binder, and an adhesive formed on the leather layer. A transfer film characterized by being composed of layers. (9) The transfer film according to claim 8, wherein the leather layer has a printed layer with a predetermined pattern such as a character symbol or a pattern formed on the surface of the leather layer. (10) The transfer film according to claim 8, wherein the release layer is a pseudo-grain surface layer fixed to the surface of the leather layer. (11) The transfer film according to claim 10, wherein the pseudo-grain layer is made of a thermoplastic elastomer. (12) The transfer film according to claim 8, wherein the leather layer is formed by mixing short fibers of natural fibers or chemical fibers in addition to natural leather powder.