JP2016159593A - Leather laminated film, leather laminated film molded body, composite resin molded body, and method for producing leather laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leather laminated film, a leather laminated film molded body, a composite resin molded body, and a method for producing a leather laminated film, which keep feeling of a natural leather body and can form a coating of a leather with a comparatively simple work.SOLUTION: A leather 2 and a resin film 3 are laminated with an aqueous curable adhesive 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a leather laminated film of leather and a resin film, a leather laminated film molded body and a composite resin molded body using the same, and a method for producing a leather laminated film.

  A conventional steering wheel of an automobile or the like is formed of a ring part continuously formed in a circle, a boss part located at the center of the ring part, and a plurality of spoke parts radially connected from the boss part. For the purpose of preventing slipping, improving touch feeling, and giving a high-class feeling, at least the ring part is coated with natural leather (hereinafter simply referred to as leather, unless otherwise specified, leather refers to natural leather).

  Further, the present invention is not limited to a steering wheel, and automobile interior parts, and various products other than automobiles that have leather attached thereto are preferred.

  Conventionally, the leather of the steering wheel has been coated by hand sewing. In the hand-sewn method, the cut leather is wrapped around a covering body such as a steering wheel or a shift knob, and then the leather ends are butted together by hand. However, this hand-sewn operation requires a large number of man-hours and is labor-intensive, so the production volume is limited. Therefore, the steering wheel and shift knob covered with leather are expensive.

  In addition, in the hand-sewn method, the leather of the ring part leather and the spoke part leather are cut together because it is necessary to sew the ends of the leather together. For this reason, the yield at the time of leather cutting was extremely bad. And the shape of the spoke part was decided giving priority to improving the yield at the time of leather cutting. Therefore, the degree of freedom in designing the spokes and the shift knob is particularly small, and for example, the design of the spokes and the shift knob is constrained to be designed to be easy to grip.

  Therefore, recently, an adhesion method has been proposed to reduce the number of work steps. The bonding method can reduce the number of work steps, and has been widely adopted to reduce the cost (see Patent Document 1).

  However, a problem has been pointed out that in the bonding method, the leather is subject to secular change and environmental change, and the leather shrinks and peels off. Further, when the leather is thick, the soft texture of the leather remains, but there is a problem that when the leather with a thin thickness is bonded for the purpose of cost reduction or the like, the original soft texture of the leather is lost. Furthermore, since the leather itself cannot retain its shape even if it is molded, there is also a problem that it is not possible to perform an operation of molding and bonding in a predetermined shape in advance.

  Moreover, the technique which press-processes the lamination sheet which interposed the thermoplastic resin layer between the leather sheet | seat and another sheet | seat is disclosed (refer patent document 2). However, with this technique, the surface of the natural leather is completely pressed and cured, so that it is difficult to obtain one having the natural texture of natural leather.

JP 2000-53000 A JP 2001-259264 A

  In view of such circumstances, the present invention provides a leather laminated film, a leather laminated film molded article, a composite resin molded article, and a leather laminated laminate capable of maintaining the original texture of natural leather and providing a leather coating by a relatively simple operation. It is an object to provide a method for producing a film.

  A first aspect of the present invention that solves the above-described problems resides in a leather laminated film in which leather and a resin film are laminated with an aqueous curable adhesive.

  In such a first aspect, by laminating using an aqueous curable adhesive, it is possible to realize a laminate with a resin film while leaving the original texture of leather.

  According to a second aspect of the present invention, in the leather laminated film of the first aspect, the resin film has a larger area than the leather.

  In the second aspect, when vacuum / pressure forming is performed in a state where the periphery of the resin film is sandwiched between molds, leather is not wasted, and a leather laminated film molded body having a desired shape can be realized.

  According to a third aspect of the present invention, in the leather laminated film according to the first or second aspect, the resin film has a thickness of 0.2 to 0.5 mm, and the leather has a thickness of 0.3 to 0. It is in a leather laminated film characterized by being 8 mm.

  In the third aspect, by laminating using an aqueous curable adhesive, it is possible to reliably realize a leather laminated film that can be formed by vacuum / pressure forming while keeping the original texture of the leather.

  According to a fourth aspect of the present invention, there is provided a leather laminated film molded body in which the leather laminated film according to any one of the first to third aspects is formed into a predetermined shape by vacuum pressure.

  In the fourth aspect, a leather laminated film molded body having a desired shape and having a leather original texture on the surface can be realized.

  According to a fifth aspect of the present invention, the leather laminated film molded body according to the fourth aspect is partially provided and a resin molded body provided by insert molding a resin into the leather laminated film molded body. The composite resin molded product is characterized.

  In the fifth aspect, by performing insert molding using a leather laminated film molded body, a composite resin molded body having a leather coating having a leather original texture on the surface can be realized.

  The sixth aspect of the present invention includes a step of applying an aqueous curable adhesive to one side of the leather and one side of the resin film, an application layer of the aqueous curable adhesive of the leather, and the resin. The step of heat-drying and activating the aqueous curable adhesive coating layer of the film is combined with the aqueous curable adhesive coating layer of the leather and the aqueous curable adhesive coating layer of the resin film. A method for producing a leather laminate film comprising: a step, a step of pressure-bonding the bonded laminate, and a step of curing the pressure-bonded laminate to form a leather laminate film.

  In this sixth aspect, a laminate with a resin film can be produced while leaving the original texture of leather by laminating in a predetermined step using an aqueous curable adhesive.

  As described above, in the present invention, by laminating using an aqueous curable adhesive, it is possible to realize a laminate with a resin film while leaving the original texture of leather, and using this, vacuum compressed air is used. By doing so, a leather laminated film molded body can be realized, and by further insert molding, a composite resin molded body can be realized.

It is the perspective view and side view of the leather laminated film which concern on one Embodiment of this invention. It is a figure explaining the manufacturing process of a leather laminated film. It is a figure explaining the manufacturing process of a leather laminated film. It is sectional drawing which shows an example of a vacuum pressure mold. It is sectional drawing of the leather laminated film molded object of one Embodiment. It is sectional drawing of the composite resin molding of one Embodiment. It is sectional drawing which shows an example of an insert molding die.

  Hereinafter, the present invention will be described in detail based on embodiments.

(Embodiment 1)
1 (a) and 1 (b) are a perspective view and a side view showing an outline of a leather laminated film according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a leather laminated film 1 according to this embodiment is obtained by laminating leather 2 and a resin film 3 with an adhesive layer 4 made of a water-soluble curable adhesive.

  The leather 2 is a natural leather having a thickness of about 0.3 to 0.8 mm, and the resin film 3 is a resin film having a thickness of 0.1 to 0.5 mm, preferably 0.15 to 0.4 mm. is there. The material of the resin film 3 is not particularly limited, and examples thereof include polycarbonate, acrylic, and vinyl chloride, and polycarbonate is particularly preferable.

  Examples of the water-soluble curable adhesive forming the adhesive layer 4 include a water-based urethane adhesive and a water-based acrylic adhesive, and a water-based urethane adhesive is preferable.

  Since the leather laminated film 1 of the present invention has the leather 2 and the resin film 3 laminated by the adhesive layer 4 made of an aqueous curable adhesive, the original texture of the leather can be maintained and formed into a desired shape. Is.

  In addition, in the leather laminated film 1 of this embodiment, the resin film 3 has a larger area than the leather 2 when used for fixing the outer edge of the leather laminated film 1 when vacuum / pressure forming described later. It is to do. Of course, although the leather 2 is wasted, the leather 2 and the resin film 3 having the same shape may be laminated.

  In FIG. 2, FIG. 3, the outline process of an example of the manufacture example of the leather laminated film 1 is shown. As shown in the figure, first, aqueous curable adhesive is applied to the adhesive surface of the leather 2 having a thickness of about 0.6 mm and the adhesive region of the resin film 3 made of a polycarbonate film having a thickness of 0.3 mm. Agent 4a, in this embodiment, a water-soluble urethane adhesive was applied by, for example, spray coating (FIG. 2A). Here, the application method is not particularly limited as long as the adhesive can be applied thinly and uniformly, and may be performed by brush application, roller application, or the like. In order to maintain the texture, spray coating is preferred.

  Next, the leather 2 and the resin film 3 to which the water-soluble curable adhesive is thus applied are subjected to heat treatment for drying and activation treatment of the adhesive (FIG. 2B).

  The drying / activation treatment is performed by heat treatment, and it may be carried out so that moisture evaporates and the solid content is heat activated. The method is not particularly limited, but is preferably a far infrared heater or a near infrared heater. Should be used. Heating conditions are preferably performed under conditions that do not cause a curing reaction. For example, heat treatment is preferably performed so that the object to be processed has a temperature of about 60 to 80 ° C. In this embodiment, for example, five far-infrared heaters 5 having a heat treatment capability of about 200 ° C. and a near-infrared heater 6 having a heating capability of about 700 ° C. are used for continuous processing. Then, a treatment at 60 to 80 ° C. was performed, and finally, a high temperature treatment at about 80 to 120 ° C. was instantaneously performed, followed by drying and activation.

  Next, the leather 2 and the resin film 3 that had been subjected to drying / activation treatment were laminated with the adhesive surfaces thereof aligned (FIG. 3A). Then, both were pressure-bonded using the roller 7 etc. (FIG.3 (b)).

Although the conditions for crimping are not particularly limited, for example, the pressure is about 5 to ²⁰ kg / cm ² . Thereby, the leather laminated film 1 is manufactured (FIG. 3C).

  Such a leather laminated film 1 is laminated by using a water-based curable adhesive such as a water-based urethane adhesive, so that the applied adhesive is cured without impregnating the fibers of the leather, or the leather The original texture was left.

  Moreover, although it cannot be shape | molded in a desired shape only with the leather 2, since the leather laminated | multilayer film 1 is a laminated body with the resin film 3, it can be shape | molded in a desired shape.

  The leather laminated film 1 can be formed by press molding or the like, but in order to mold the leather while maintaining the original texture as much as possible, it is preferable to perform vacuum / pressure forming.

  Vacuum / pressure forming is performed by using a predetermined mold and evacuating from one surface of the leather laminated film 1 and simultaneously applying pressure from the other surface with a gas such as air. The surface to be pressed is the surface of the leather 2 and is pressurized with gas, so that the original texture of the leather can be maintained.

  A specific vacuum / pressure forming process is schematically shown in FIG. The vacuum pressure mold 20 shown in FIG. 5 has a lower mold 21. The lower mold 21 includes a convex portion 22 having a desired shape, and includes a plurality of through holes 23 that open to the molding surface of the convex portion 22 and are evacuated. Moreover, in the outer edge part of the leather laminated film 1, and the leather laminated film 1 of FIG. 5, the fixing | fixed part 24 which fixes only the resin film 3 is comprised. On the other hand, the upper die 25 has a concave portion 27 that defines a predetermined space 26 between the upper die 25 and a plurality of pressurizing holes 28 for introducing pressurized gas into the space 26. Is.

Vacuum / pressure forming uses the above-described vacuum / pressure air mold 20 and covers the leather laminated film 1 on the convex portion 22 while evacuating from the through hole 23 of the lower die 21 at, for example, about −1 kg / cm ² , and fixing portion 24, the leather laminated film 1 is fixed to the lower mold 21. In this state, the upper mold 25 is closed, and a pressurized gas, for example, air is introduced into the space 26 between the leather laminated film 1 and the upper mold 25 from the pressure hole 28. Thereby, the surface which consists of the leather 2 of the leather laminated film 1 is pressurized with the force F of about 0-300 kg / cm < ² >. Moreover, you may heat the lower mold | type 21 to about 60-80 degreeC as needed.

  Thereby, the leather laminated film molded object 10 as shown to Fig.4 (a) can be manufactured. At this time, since the surface of the leather 2 is pressurized with gas, the original texture of the leather can be maintained.

  Moreover, the leather laminated film molded object 10 can cut | disconnect an unnecessary site | part, and can be set as the leather laminated film molded object 11.

  Such a leather laminated film molded body 11 can be used for various applications such as a smartphone case, and further, insert molding using the leather laminated film molded body 11 to form a composite resin molded body. it can.

  In FIG. 6, the cross section of an example of a composite resin molding is shown. As shown in the figure, the composite resin molded body 30 is obtained by integrally forming a resin molded portion 31 on the resin film side of the leather laminated film molded body 11.

  An outline of an example of a method for producing such a composite resin molded body 30 is shown in FIG. FIG. 7 shows an example of an insert molding die for molding the composite resin molded body 30. The insert molding die 40 includes an upper die 41. The upper die 41 includes a concave portion 42 for holding the leather laminated film molded body 11 and a plurality of through holes 43 opened in the inner surface of the concave portion 42, and the leather laminated film is sucked through the through holes 43. The molded body 11 can be held in the recess 42. Further, the insert molding die 40 includes a lower die 45. The lower mold 45 has a molding recess 46 that molds the resin molding portion 31 between the lower mold 45 and a resin inflow passage 47 that communicates with the molding recess 46. The nozzle 49 of the injection molding machine 48 is connected to the opposite side.

  The composite resin molded body 30 can be manufactured by insert molding the resin using such an insert molding die 40 while holding the leather laminated film molded body 11 in the recess 42 of the upper mold 41.

  Thus, the composite resin molded body 30 manufactured by insert molding using the leather laminated film molded body 11 is provided with a leather coating having a leather original texture on the surface.

DESCRIPTION OF SYMBOLS 1 Leather laminated film 2 Leather 3 Resin film 4 Adhesive layer 10, 11 Leather laminated film molded body 20 Vacuum pressure air mold 30 Composite resin molded body 31 Resin molded part 40 Insert mold

Claims (6)

  A leather laminated film comprising a leather and a resin film laminated with an aqueous curable adhesive.   The leather laminated film according to claim 1, wherein the resin film has a larger area than the leather.   The leather laminated film according to claim 1 or 2, wherein the resin film has a thickness of 0.2 to 0.5 mm, and the leather has a thickness of 0.3 to 0.8 mm. Laminated film.   A leather laminate film molded body, wherein the leather laminate film according to any one of claims 1 to 3 is formed into a predetermined shape by vacuum pressure air.   5. A composite resin molded body comprising a leather multilayer film molded body according to claim 4 in a part, and comprising a resin molded body provided by insert molding a resin in the leather multilayer film molded body. Applying an aqueous curable adhesive to one side of the leather and one side of the resin film;
A step of heat-drying and activating the aqueous curable adhesive coating layer of the leather and the aqueous curable adhesive coating layer of the resin film;
Combining the aqueous curable adhesive coating layer of the leather with the aqueous curable adhesive coating layer of the resin film;
A step of pressure-bonding the laminated body,
A method for producing a leather laminate film comprising: curing a pressure-bonded laminate to form a leather laminate film.

Images