JPS60183114A - Manufacture of decorative molding - Google Patents

Abstract

PURPOSE:To manufacture a thin molding having a glassy surface by pouring a plurality of lines of thermosetting liquid resin on a molding base, joining them, making a single liquid resin surface and then hardening it. CONSTITUTION:Two lines of thermosetting liquid resin 21, 22 are poured on the upper surface 15 of the molding base 11 having an adhesive tape layer 30, joined into a single liquid resin surface 23, then said surface is hardened to make a clear decorative surface 20 like glass. Since the ends 16, 17 of the base are made sharp, the liquid resins 21, 22 are stopped by their surface tension at said edge to obtain nicely finished ends. Since resin is poured in a plurality of lines the decorative surface 20 can be thinned.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing decorative moldings.

Plastic decorative moldings are used for the surfaces of side panels of automobiles, the edges of window frames and other parts, and the edges of furniture.

In recent years, extremely thin protective moldings have been required due to the diversification of needs in moldings for automobiles and the like mentioned above.

Normally, extrusion molded products are often used for this type of decorative molding from the viewpoint of efficiency and economy, but in the case of extrusion molding, the molded product is extruded from a gou in a molten state immediately after molding. There is a limit to how thin the wall can be made due to the handling of the product, and for products with a width of 2 to 3 cm, the limit for wall thickness is approximately 4 to 5 m, and thinner wall thicknesses are limited to 4 to 5 m. It was extremely difficult to obtain such moldings.

It is also proposed to reduce the thickness by rolling or other means after extrusion molding, but this may result in uneven molding width, or the surface may have scratches from rolling rolls, etc., resulting in poor appearance. Due to decorative issues, it cannot be implemented.

In addition to the above-mentioned extrusion molding, this type of molding can also be obtained by injection molding, but more beautiful products with new concepts are always being sought.

This invention was proposed in view of the current situation, and its purpose is to create a beautiful molding with excellent decorative properties that has a glossy crow-like clear surface on two sides. In particular, it is an object of the present invention to provide a novel method for obtaining a new concept molding having an extremely thin wall thickness, which is difficult to achieve using conventional extrusion molding.

Another object of this invention is to easily and reliably produce the above-mentioned novel and highly decorative moldings.
Moreover, it is an object of the present invention to provide a method that can be obtained efficiently.

In order to achieve the two objectives, this invention allows thermosetting liquid plastics to flow down onto the upper surface of a substrate from a plurality of nozzles, and the plurality of strips of liquid plastics are cast in the direction of the surface and merged. The gist of the present invention is to form a single liquid plastic surface and then heat and harden it to integrally form a plastic decorative surface on the upper surface of the base.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below along with embodiments according to the accompanying drawings.

Figure 1 of the accompanying drawings is a partially omitted perspective view of a decorative molding obtained by the present invention, particularly a protective molding to be attached to a side panel of an automobile, and Figure 2 is a cross-sectional view showing the end portion thereof. , FIG. 3 is a cross-sectional view showing the side end portion similarly cut in the width direction, and FIG.
Figure 5 is a cross-sectional view showing the state in which multiple strips of liquid plastic are cast in the direction of the surface and merge to form a single liquid plastic surface, and Figure 6 is a sectional view showing the state in which the liquid plastic surface is heated and hardened. The sectional view shown in FIG. 7 is a sectional view showing a state in which liquid plastic is cast when the liquid plastic is poured from a single nozzle.

As shown in FIG. 1 to FIG. 3, the decorative molding 10 obtained by the method of the present invention includes a base made of a plastic sheet strip 11, etc., and a hardened portion of thermosetting liquid plastic formed on the surface of the base. It is composed of a decorative surface 20 consisting of.

The plastic decorative surface 20 is a glossy, smooth, beautiful surface with a lens-like effect, each edge 25
, 26 and 27 are formed with rounded corners.

In the figure, reference numeral 30 is an adhesive tape for attaching this decorative molding to the vehicle body, 31 is an adhesive, and 32 is a protective paper.

The illustrated molding 10 is placed on the surface of a 0.5i+m plastic sheet strip 11. A plastic decorative surface 20 of o+om is formed, and combined with an adhesive tape 30 of 0.4 mm, a thin molding with a total wall thickness of 1.9IIl111 is obtained.

2 (For the body, in addition to the plastic sheet 11 made of vinyl chloride resin or the like in the example, extrusion molding or injection molding of an appropriate plastic can be used, and the body can be colored or molded to enhance its decorative effect. , or printed decorations such as letters and patterns may be formed on the surface.

It goes without saying that the shape of the substrate can be arbitrary, but the edge of the substrate surface 15 on which the liquid plastic is cast may be a sharp edge, such as the right-angled edge 19 shown, for example. "Casting of the liquid plastics" described below is preferred.

Next, the method of the present invention will be explained in JL style with reference to FIG. 4 and the following figures.

FIG. 4 shows a state in which thermosetting liquid plastics 21, 22 are poured onto the surface 15 of the plastic sheath I/substrate 11 from a plurality of nozzles 41, 42.

The liquid plastics 21, 22 are flowed down onto the horizontally held substrate 11J-plane 15 at intervals and amounts most convenient for the casting and merging described below.

When the substrate ti is a long and thin strip, it is flowed down parallel to its longitudinal direction as shown in the figure.

Liquid plastics 2 flowed down to the (body) surface 15
1 and 22 are then shown in the 5th ward name map (a), (b)
, (c)... are cast and merged as shown in the figure.

That is, the liquid plastics 21 and 22 in each strip flow from the bead-shaped state (a) immediately after flowing down, and flow in the surface direction on the base surface 15, and when they reach the end edge 16 +' 17, they are stopped there by surface tension ( b).

Liquid plastics with one end stopped by surface tension 21.2
2 flows to the opposite center side and merges with each other there (c). The merged liquid plastics 21 and 22 now undergo a physical action to maintain a uniform surface due to the surface tension of the combined liquid, instead of the surface tension of each of them in the previous flow. As a result, a single liquid plastic surface 23 with a uniform surface is formed (d).

The liquid plastic surface 23 is thus formed by utilizing the natural flow of the liquid and its surface tension. especially,
In this invention, in addition to the surface tension caused by the casting of multiple strips of liquid, the surface tension caused by the merging of multiple liquids is utilized, making it possible to form extremely thin liquid plastic products. It will become.

For comparison with the present invention, FIG. 7 shows a state in which liquid plastic is flowed down from a single nozzle onto a substrate, but in the case of a single liquid, as shown in the figure, There are limits to the casting range and wall thickness, and it is not possible to cast widely and thinly as in the present invention, in which multiple liquids are combined.

Furthermore, by forming the edge of the substrate surface 15 on which the liquid plastic is cast into a sharp edge such as the right-angled edge 19, the liquid plastic is raised at the sharp edge due to surface tension. A curved surface can be formed to create a decorative surface with rounded corners and beautiful edges.

Here, regarding the liquid plastic used in the present invention, this plastic is thermosetting.
Usually transparent materials are used; for example, liquid polyurethane compositions consisting of polyols and diisocyanates are preferred materials. These include appropriate catalysts for the purpose of accelerating or controlling the curing rate, and antioxidants, ultraviolet absorbers, and light stabilizers for the purpose of improving physical properties such as heat resistance, light resistance, or weather resistance of molded products. These adjuvants are mixed in appropriate amounts and used.

Other useful liquid plastics include liquid acrylic resin compositions containing methyl methacrylate as a main component and epoxy resin compositions having epoxy groups in their molecules. Note that the liquid plastic may be colored by mixing a dye or the like.

After the liquid plastic surface 23 is formed, the liquid plastic is heated and cured to be integrated with the base 11.

Heating may be done by irradiating infrared rays with an infrared lamp 45 as shown in FIG. 6, or by introducing it into a heating furnace. The heating temperature will depend on the material and physical properties of the liquid plasticine, but will be approximately 50 to 80°C.

As shown and explained in 1 below, according to the method for manufacturing a decorative molding of the present invention, thermosetting liquid plastic is flowed onto the upper surface of the substrate from a plurality of nozzles, and the plurality of strips of liquid plastic are spread in the surface direction. The method is characterized in that the plastic decorative surface is integrally formed on the upper surface of the base by casting and merging to form a single liquid plastic surface, and then heating and curing the surface. Due to surface tension, a glossy glass-like clear surface is formed on the top surface of the base plastic, and if necessary, a plastic layer with an extremely thin wall thickness is formed, making it possible to easily and reliably create beautiful moldings with excellent decorative properties. It has become possible to obtain this information more efficiently.

[Brief explanation of the drawing]

FIG. 1 is a perspective view with a part omitted of a decorative molding obtained by the present invention, particularly a protective molding attached to a side panel of an automobile, FIG. 2 is a cross-sectional view showing the end portion thereof, and FIG. The figure is a cross-sectional view showing the side edges of the same cut in the width direction, Figure 4 is a cross-sectional view showing the state in which liquid plastic is flowing down on the upper surface of the base, and Figure 5 is a cross-sectional view showing the liquid plastic flowing down on the upper surface of the base. Fig. 6 is a cross-sectional view showing the state in which the liquid plastic surface is heated and hardened, and Fig. 7 is a cross-sectional view showing the state in which the liquid plastic surface is heated and hardened. FIG. 3 is a cross-sectional view showing the state of casting of liquid plastics when the liquid plastics are flowed down from the nozzle of FIG. lO...protective molding for automobiles, 11...substrate, 16.17...edge portion, 19...right-angled edge, 2
0... Decorative surface of plastics, 21.22...
Liquid plastics, 23...Liquid plastics surface, 30...Adhesive tape, 41.42...Nozzle, 4
5...Infrared lamp. Patent Applicant Inoue MCP Co., Ltd. Agent Figure 1 Figure 2 Figure 0 Figure 3 Figure 4 Figure 5 (a),'(b) 2 ninini ni 22) (C) '(d) Figure 6 Figure 7

Claims (1)

[Claims] l. Thermosetting liquid plastic is flowed down from a plurality of nozzles onto the upper surface of the substrate, and the plurality of strips of liquid plastic are cast in the direction of the surface and merged to form a single liquid plastic surface. A method for manufacturing a decorative molding, which comprises: heating and curing the molded material to integrally form a plastic decorative surface on the upper surface of the base. 2. The method for manufacturing a decorative molding according to claim 1, wherein the edge of the liquid plastics casting portion on the upper surface of the substrate is formed with a sharp edge. 3. The method for producing a decorative molding according to claim 1 or 2, wherein the substrate is a plastic sheet strip.