JP3404101B2 - Surface decoration method of plastic molded article and composite sheet produced by the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-decorating method for decorating the surface of a plastic molded article and a molded and surface-decorated composite sheet produced by the method.

[0002]

2. Description of the Related Art The surface decoration method for a plastic molded product, in which a pattern is printed or painted on the surface of the plastic molded product, increases the added value of the molded product and gives a high-class feeling. In recent years, it has been particularly noticed for the purpose of giving it. However, many molded products have complicated three-dimensional surfaces, and it is often difficult to give a uniform pattern to the surface having such a complicated shape for finishing. After the pattern is formed on the molded product, it is general to coat the pattern layer in order to protect the pattern layer and give a high-grade feeling. However, such a painting work requires man-hours and time in the work process, resulting in an increase in cost.

There is a hydraulic transfer method as a method for solving such a drawback. In this hydraulic transfer method, as shown in FIG. 4, a printing film 54 (FIG. 4A) having a printing ink layer 52 in which a desired pattern is printed on a water-soluble film substrate 50 is provided on the printing surface 52 side. Activating process of ink for spraying an activator (solvent) to dissolve ink a little and improving transferability onto a molded product (FIG. 2 (b)), activated printing film Floating step 54 on the surface of water for floating 54 in a water tank 56 (FIG. 7B), and application of a pretreatment agent for spraying a primer on the surface of the molded product 58 to ensure the adhesion between the molded product and the printing ink layer 52. Step ((c) of the same figure), a base coating step of applying a base coat of a base color and drying it sufficiently to make the finished hue uniform ((d) of the same figure), Formed on the floated printing film 54 The transfer step of pushing in the product 58 and uniformly pressing and adhering the film 54 activated by water pressure on the surface of the molded product ((e) in the same figure), and cleaning the water-soluble film layer 50 of the transferred printing film 54. To remove only the printing ink layer 52 by washing with water or a weak solvent 60 ((f) in the same figure), and if necessary, the water and solvent are dried and removed to completely adhere the ink. A drying step, a top coating step of applying a top coating to protect the printing ink layer (FIG. 9 (g)), and a heating step of drying or curing the top coating material to obtain a finished product 62.

However, this hydraulic transfer method requires special mechanical equipment, requires a special printing film, requires several coating steps, and not only leads to an increase in cost, but also a coating film on the surface layer. The thickness is as thin as about 0.05 mm, the degree of clearness is low and a high-quality surface cannot be obtained. Further, since water is used, there is a problem that it is difficult to use a material that is weak against water such as wood.

An object of the present invention is to provide a method for decorating the surface of a plastic molded product, which obtains a plastic molded product having a decorated surface of high quality at low cost. More specifically, a conventional vacuum forming machine can be diverted and used, a commercially available inexpensive vinyl chloride resin sheet with a pattern can be used, and by providing a thick acrylic resin sheet layer on the surface, it is clear and deep. It can have a certain finish,
To obtain a plastic molded product with a high degree of clarity and a high-quality decorated surface that does not have any troublesome painting process in all processes and is not limited by the shape and material of the plastic molded product to be decorated. It is an object of the present invention to provide a method for decorating the surface of a plastic molded article and a molded and surface-decorated composite sheet produced by the method.

[0006]

In order to solve the above problems BRIEF SUMMARY OF THE INVENTION, surface decoration method of the plastic molded article of the present invention, A
Kuryl resin sheet and vinyl chloride resin sheet with handle
And apply adhesive or solvent and laminate while heating
Laminating process and composite obtained by laminating process
Annealing process of heat treating the sheet and annealing
Heat treated softened composite sheet,
Vacuum the composite sheet on the plastic molded product.
A molding step of molding the composite sheet on the molded article,
The composite sheet molded by the molding step is the molded product.
Remove it from the top and cut off the extra part of the composite sheet
Trimming process and composite sheet that has been trimmed
And a bonding step of bonding onto a molded product .

[0007]

Further, the decorative composite sheet definitive molded and surface to the onset Ming, laminated while heating and applying an adhesive or solvent and vinyl chloride resin sheet attached with acrylic resin sheet and the handle Laminating step, annealing step of heat-treating the composite sheet obtained by the laminating step, heat-softening the annealed composite sheet, and the heat-softened composite sheet is vacuum-sucked onto a plastic molded article to form the molded article. It is manufactured by a molding step of molding the composite sheet on the top and a trimming step of once removing the composite sheet molded by the molding step from the molded product and cutting out the composite sheet of an excessive portion. It has a feature.

[Detailed Description of the Invention] Laminating Step (FIG. 1 (a)) As shown in FIG. 1 (a), an adhesive or an adhesive agent is applied onto an acrylic resin sheet 2 of a predetermined size placed on a carrier plate. While applying the solvent, the vinyl chloride resin sheet 4 having a pattern on its surface is fed by the feed rollers 6 and 6, and the pressure rollers 8 and 10 are fed.
Then, the two sheets 2 and 4 are laminated. At this time, the temperature of the pressure roller 8 on the vinyl chloride resin sheet side is heated to about 50 to 80 ° C. By this treatment, a composite sheet in which a vinyl chloride resin sheet 4 having a pattern is adhesively laminated on the acrylic resin sheet 2 is obtained. The acrylic resin referred to in this specification includes not only acrylate but also methacrylate.

The thickness of the acrylic resin sheet used here is preferably about 0.3 to 2 mm. If the thickness is too thin, the smoothness of the acrylic resin sheet after molding will be insufficient,
On the other hand, if it is too thick, the trimming work after the molding process becomes difficult. A commercially available product may be used as the patterned vinyl chloride resin sheet to be used, and the thickness thereof is 0.08 to 0.
It is preferably about 16 mm. As the vinyl chloride resin sheet 4 with a pattern, as shown in FIG. 3 , one having a printed layer 14 with a pattern printed on the vinyl chloride base layer 12, or further, for example, vinyl chloride on the printed layer 14. Although any of those provided with a protective layer 16 made of a resin can be used, in the present invention, since a thick acrylic resin sheet is adhered on the printed layer 14, further protection is provided on the printed layer 14 such as the latter. The layer 16 may not be used. However, depending on the type of the adhesive or solvent used for bonding the vinyl chloride resin sheet and the acrylic resin sheet, it may be preferable to provide a protective layer for protecting the printing layer from the adhesive or solvent.

As the adhesive to be applied on the acrylic resin sheet, an acrylic resin-based adhesive is preferable because it has good adhesiveness and also has good transparency on the adhesive surface. Further, as the solvent, a solvent capable of dissolving both acrylic resin and vinyl chloride resin, for example, dichloroethane can be used.

[0012]

[0013] The layered structure of the composite sheet 18, contact Chakuzaiso 2
Through 0, acrylic resin sheet layer 2 on the upper side, Ru layer structure der the vinyl chloride resin sheet layer 4 are laminated with the upper surface a printed layer 14 on the lower side.

Annealing process (FIG. 1 (b)) Composite sheet 18 laminated by laminating process
Is placed in a heating dryer 24 and heat-treated at a temperature of about 50 to 80 ° C. for about 5 to 20 hours. By this annealing treatment, the residual solvent is removed, the adhesive strength between the laminated acrylic resin sheet and the vinyl chloride resin sheet is increased, and the moisture remaining in the acrylic resin sheet is removed. If the treatment temperature is too low or the treatment time is too short, annealing will not be performed sufficiently, and if the treatment time is too long, it will be complex.
The sheet deteriorates.

Molding process (FIGS. 1 (c) and 1 (d)) The composite sheet 18 which has been subjected to the annealing treatment is clamped at its end and the sheet-shaped heater 26 is used to form the composite sheet 18 into 9 pieces.
It is heated and softened at a temperature of about 0 to 140 ° C (Fig. 1
(C)). If the temperature is too low, the softening is insufficient, and if the temperature is too high, the softening is excessive and the workability deteriorates. Next, the lower table 30 of the vacuum molding machine on which the plastic molded product 28 is placed is raised, and at the same time, vacuum suction is performed from the vacuum suction holes 32 to remove the air between the composite sheet 18 and the molded product 28 to remove the molded product 28. The composite sheet 18 is formed along the outer shape (FIG. 1D). At this time, work is performed so that the vinyl chloride resin sheet layer 4 side of the composite sheet 18 faces the upper surface side of the molded product 28.

[0016]

The material of the plastic molded product for molding the composite sheet is not particularly limited. General-purpose plastic molded products such as ABS resin, AS resin, polypropylene,
Molded products such as vinyl chloride resin and polystyrene can be used. A material having low water resistance can also be applied.

[0018]

[0019]

[0020]

[0021]

Trimming process (FIGS. 2A and 2B) Next , for example, compressed air is sent in reverse from the vacuum suction port (FIG. 2).
(A)), The molded composite sheet 18 is once removed from the molded product 28, and the excess portion of the composite sheet is cut off as indicated by the alternate long and short dash line (FIG. 2B). The cutting method is special
Manual cutting with a knife, but not limited to
Method, mechanical cutting method using NC router, laser
-Choose from among non-mechanical cutting methods such as cutting using light
You can choose. At the stage where this trimming process is completed, the composite sheet 18 having a shape conforming to the outer shape of the molded product and having a decorated surface is obtained. Then, the surface 36 of the molded product
Alternatively, an adhesive is applied to the adhesive surface side 38 of the composite sheet, and the composite sheet 18 is adhered onto the molded product 28 (FIG. 2 (c)) to obtain a finished product 34 (FIG. 2 (d)). As an adhesive used
Is a urethane emulsion adhesive, which has good adhesiveness.
Workability of cloth and the like is also good and preferable.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. Commercially available (made by Nippon Gravure, trade name System All # 156, with a pattern on the surface of acrylic resin sheet 2 with a thickness of 0.8 mm while applying an acrylic adhesive.
6-21) The vinyl chloride resin sheet 4 having a thickness of 0.16 mm is fed to the pressure rollers 8 and 10 (the pressure roller 8 is heated to 80 ° C.) by the delivery rollers 6 and 6 to bond the both sheets 2 and 4 to each other. to obtain a composite sheet 18 and the product layer.

Next, this laminated composite sheet 1
8 was placed in a dryer 24, and heat-treated at 70 ° C. for about 16 hours to anneal the composite sheet 18.

A plastic molded product 28 made of ABS resin which has been preheated at 50 ° C. for about 10 minutes is placed on a lower table 30 of a vacuum molding machine and annealed to form the composite sheet 18.
The end portion of the sheet was clamped, and the composite sheet 18 was heated from above by the planar heater 26 to about 120 ° C. to soften it. When the composite sheet 18 is softened, the lower table 30 of the vacuum forming machine is raised and the air between the molded article 28 and the composite sheet 18 is removed from the vacuum suction port 32 so that the composite sheet 18 becomes the outer shape of the molded article 28. molding along.

[0026]

[0027]

[0028] to the next, the molded article of the composite sheet 18 was formed 2
8) Remove the composite sheet from above, and use the laser cutter to remove the extra part of the composite sheet at the position indicated by the chain line (see Figure 2).
Then, the composite sheet 18 having a decorative surface is formed into a shape along the outer shape of the molded article 28. Then, joining the adhesive sheet of the acrylic onto the molded article 28, and bonding the composite sheet 18 thereon, finished composite sheet 18 has been decorated in the bonded surface of the plastic molded article on the molded product 28 34 was obtained.

According to the method of the present invention, a conventional vacuum forming machine can be diverted and used as it is, a commercially available inexpensive vinyl chloride resin sheet can be used, and there is no troublesome painting step in all the steps and the cost is low. Thus, it is possible to obtain a plastic molded product having a high degree of clarity and a high-quality decorated surface. Further, there is no limitation on the shape and material of the plastic molded product that is the object of decoration. INDUSTRIAL APPLICABILITY The method of the present invention is suitable as a method for decorating the surface of a plastic molded product having a complicated shape such as an automobile interior product or a stereo cabinet. Also,
The molded and surface-decorated composite sheet of the present invention is
It can be used as a surface repair part for molded products. Again
The composite sheet that has been molded and adhered onto the molded product.
Until the next trimming work is difficult, for example,
Molded product when trimming the composite sheet of the minute part
There is no danger of damaging.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a process of the present invention.

FIG. 2 is a diagram to explain the higher engineering of the present invention.

Figure 3 is an explanatory view of a layer structure of a vinyl chloride resin sheet, labeled with handle.

FIG. 4 is an explanatory diagram of a conventional hydraulic transfer method.

[Explanation of symbols]

2 Acrylic resin sheet 4 Vinyl chloride resin sheet 18 composite sheet 28 Plastic molded products 34 finished product

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 65/00-65/82 B29C 51/00-51/46

Claims (2)

(57) [Claims] 1. A laminating step in which an acrylic resin sheet and a patterned vinyl chloride resin sheet are coated with an adhesive or solvent and laminated while heating, and an annealing step in which a composite sheet obtained by the laminating step is heat-treated. And, the composite sheet that has been subjected to annealing is softened by heating,
This heat-softened composite sheet is vacuum-sucked onto a plastic molded product to form the composite sheet on the molded product, and the composite sheet molded by the molding process is once removed from the molded product, A method for decorating the surface of a plastic molded product, which comprises a trimming process of cutting out an excessive portion of the composite sheet, and an adhesion process of adhering the trimmed composite sheet onto the molded product. 2. A laminating step in which an acrylic resin sheet and a vinyl chloride resin sheet with a pattern are applied with an adhesive or a solvent and laminated while heating, and an annealing step in which a composite sheet obtained by the laminating step is heat-treated. And, the composite sheet that has been subjected to annealing is softened by heating,
This heat-softened composite sheet is vacuum-sucked onto a plastic molded product to form the composite sheet on the molded product, and the composite sheet molded by the molding process is once removed from the molded product, Manufactured by a trimming process that cuts out the excess part of the composite sheet,
A composite sheet that is molded and has a decorated surface.