JPH0360289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method of manufacturing decorative moldings.

Long 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.

Generally, as this type of decorative molding, one made of plastic extrusion molding is the most advantageous in terms of production efficiency and economy, and is often used in practice.

However, when obtaining this type of molding by extrusion, it is natural that
Since items with the same cross-sectional shape are continuously molded, there are cases where a shape that changes in the longitudinal direction is required, or a pattern that is discontinuous in the longitudinal direction.
For example, there is a big disadvantage when forming grains or embossed patterns.

In addition, extrusion molded products have a surface with minute irregularities due to the limitations of processing accuracy on the inner surface of the die of the extruder and the sudden pressure change immediately after extruding the molten plastic from the die into the air. The drawback is that even if it is colored, the glossy and beautiful colors will not appear due to the diffuse reflection of light.

Furthermore, this type of molding can be obtained by injection molding in addition to the extrusion molding described above.
There is always a demand for products that are more beautiful and have new concepts.

This invention was proposed in view of the current situation, and its purpose is to provide a highly decorative plastic layer with a glossy glass-like clear surface on the upper surface. The objective is to provide a new way to obtain beautiful, new concept moldings.

More specifically, this invention creates a mold with excellent design by forming a glossy, glass-like clear surface that has irregular shapes in the width direction or discontinuous shapes and patterns in the longitudinal direction. The purpose is to provide a way to obtain dings.

Another object of this invention is to easily and reliably create moldings with excellent decorative properties as described above.
Moreover, it is an object of the present invention to provide a method that can be obtained efficiently.

In order to achieve the above object, the present invention casts a thermosetting liquid plastic on the surface of a substrate strip to form a liquid protrusion, which is then heated to form a flowable semi-gel. After forming the semi-gel-like protrusions into a shape, a part of the semi-gel-like protrusions is deformed by applying pressure, and the protrusions are integrally formed on the surface of the base strip by heating and hardening again. do.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 of the accompanying drawings is a partial 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.
FIG. 2 is a partial perspective view of a decorative molding according to another embodiment, FIG. 3 is an enlarged sectional view taken along the line 3--3 in FIG. 2, and FIG. Figure 5 is a cross-sectional view showing the state in which the liquid plastic is cast and the liquid protrusions formed are heated to form a semi-gel, and Figure 6 is the semi-gel. Fig. 7 is a sectional view of a state in which a part of the protruding part of the shape is pressed and deformed; Fig. 7 is a sectional view of the deformed protrusion part being heated again and hardened;
Each figure is a sectional view showing a semi-gel-like protrusion and a deformed protrusion in another embodiment.

As illustrated in FIGS. 1 and 2, a decorative molding 10 obtained by the method of the present invention
Alternatively, 10A is made up of a base strip 11 made of an extrusion molded or injection molded plastic product or a plastic sheet, and a protrusion 20 made of a hardened portion of thermosetting liquid plastic formed on the surface of the base. It is composed of

The protruding portion 20 made of a hardened portion of the liquid plastic has a glossy, smooth and beautiful surface having a lens-like effect, and a portion of the surface is pressurized and deformed into a predetermined shape. It is.
The pressurizing portion may be formed continuously in the longitudinal direction, as shown by reference numeral 25 in FIG. 1, or may be formed intermittently, not continuously in the longitudinal direction, as shown by reference numeral 26 in FIG.

Incidentally, as shown in FIGS. 2 and 3, a display portion with irregularities such as a print 27 or an embossed pattern may be formed on this pressurized portion.

Next, embodiments of the method of the present invention will be described in detail with reference to the drawings from FIG. 4 onwards.

FIG. 4 shows the thermosetting liquid plastic 21 being poured down onto the surface 15 of the substrate strip 11 and being cast.

First, the base strip 11 is made of a molded article or a plastic sheet of an appropriate shape obtained by known extrusion molding or injection molding, and its material is as follows: Appropriate plastic materials such as vinyl chloride resin, ABS resin, polyamide resin, polycarbonate resin, etc. are used. In many cases, it is colored to enhance its decorative effect, or printed decorations such as letters and patterns are formed on its surface.

It goes without saying that the shape of the base strip 11 can be arbitrary depending on the final shape of the molding, but the edge of the strip surface 15 on which the liquid plastic is cast may, for example, have the right-angled edge shown in the figure. 19
It is preferable to use a sharp edge such as the following for the purpose of casting the liquid plastic as described below.

Next, to explain the liquid plastic used here, this liquid plastic 21
is a thermosetting material and is usually transparent; for example, a liquid polyurethane composition consisting of a polyol and a diisocyanate is a preferred material. These include appropriate catalysts for the purpose of accelerating or controlling the curing rate, and for improving the heat resistance of molded products.
It is used together with auxiliary agents such as antioxidants, ultraviolet absorbers, and light stabilizers for the purpose of improving physical properties such as light resistance and weather resistance.

The liquid plastic 21 is continuously flown down and cast from the nozzle 30 or the like onto the surface 15 of the base strip to form the liquid protrusion 22 .

It is most desirable to form the protrusions 22 with liquid plastic by utilizing the natural flow of the liquid and its surface tension. For this purpose, as described above and illustrated, the edge portion of the base strip surface 15 on which the liquid protrusion 22 is to be formed must be aligned with the right-angled edge 19.
It is recommended to use a sharp edge like this.

The liquid plastic 21 is cast onto the base strip 15 by gravity flow of the liquid, and at the same time forms a curved surface that bulges due to its surface tension at the sharp edge 19, resulting in beautiful rounded edges 29. A liquid protrusion is formed.

Next, as shown in FIG. 5, the liquid ridges 22 are first preheated to become fluid semi-gel ridges 23. Heating may be performed by irradiating infrared rays with an infrared lamp 35 as shown, or may be introduced into a heating furnace.

The semi-gel-like protrusions 23 are in a state in which the liquid plastic itself is still fluid and deformable while it is undergoing gelation.

Next, as shown in FIG. 6, this semi-gel-like protruding strip 23 is partially deformed by being pressurized by a roller 40 or a pressing tool such as a press or a knife. As shown in the figure, the deformation is caused by the compressed part 23a due to pressurization and the bulged part 23 due to the movement of the compressed part.
It is caused by the formation of b.

As mentioned in the explanation of Figures 1 to 3 above, this pressure deformation can be made continuous in the longitudinal direction or not. It is also possible to form a display section with unevenness such as.

The protruding strips that have been pressurized and deformed into a predetermined shape are then subjected to final heating and hardened, as shown in FIG. 7, to be completely integrated with the base strip. This heating is also performed using an infrared lamp 35 or the like, similar to the preheating described above.

Note that this final heating may be performed simultaneously with the pressurization deformation step of the previous step. In other words, it may be preferable in terms of molding to heat the pressing jig and the protruding part while maintaining the state of pressure contact with the protruding part to harden the protruding part.

Each figure in FIG. 8 shows an embodiment in which a protrusion 20 is formed inside a base strip 11 having bulges 13, 13 at both ends. In the same figure, a shows the semi-gel-like protrusion 22, and b shows the state in which it is deformed under pressure by the roller 41. In the figure, the edge of the base strip surface portion 15 forming the protruding strip portion is formed at a right angle 19.

As illustrated and explained above, according to the method for manufacturing decorative moldings of the present invention, thermosetting liquid plastic is cast on the surface of the base strip to form liquid protrusions, and then the liquid protrusions are heated. After converting the semi-gel-like protrusions into a fluid semi-gel, a portion of the semi-gel-like protrusions is deformed by applying pressure, and the protrusions are formed on the surface of the base strip by heating and curing again. Because it is characterized by being formed in one piece,
Beautiful and novel concept molding with excellent decorative properties.In other words, beautiful molding with excellent decorative properties in which a plastic layer with a glossy glass-like clear surface is formed on the top surface of the base plastic. can now be obtained easily, reliably, and efficiently.

In particular, according to the present invention, it has an excellent design with a glossy, glass-like clear surface that has an irregular shape in the width direction or a discontinuous shape and pattern in the longitudinal direction, which is lacking in conventional moldings of this type. We are now able to offer moldings that are unique to our customers.

Furthermore, according to the invention, a conventional substrate strip, such as an extruded or injection molded article or a plastic sheet, is used to completely cover this upper surface or to expose a portion thereof. In contrast to the surface area formed by these moldings, beautiful ridges can be formed by casting and deforming the liquid plastic, making it possible to create innovative products using conventional materials. It can provide great advantages in the production of deings.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of a decorative molding obtained according to the present invention, particularly a protective molding to be attached to a side panel of an automobile, and FIG. 2 is a partial perspective view of a decorative molding according to another embodiment. A partial perspective view, Figure 3 is an enlarged sectional view taken along line 3-3 in Figure 2,
Fig. 4 is a cross-sectional view showing the state in which liquid plastic is poured onto the surface of a base strip, and Fig. 5 is a semi-gel-formed material by heating the liquid protrusions formed by casting the liquid plastic. Figure 6 is a cross-sectional view of a state in which a part of a semi-gel-like protrusion is pressurized and deformed, and Figure 7 is a cross-sectional view of a state in which the deformed protrusion is heated again and hardened. Cross-sectional views and FIG. 8 are cross-sectional views showing semi-gel-like protrusions and deformed protrusions in other embodiments. 10, 10A...protective molding for automobiles, 11...base strip, 19...right-angled edge, 20
... protrusions made of a hardened surface of liquid plastic, 21 ... liquid plastic, 22 ... liquid strip protrusions, 23 ... semi-gel strip protrusions, 25, 26...
... Pressure section, 27 ... Printing section, 35 ... Infrared lamp, 40, 41 ... Pressure roller.

Claims (1)

[Claims] 1. A thermosetting liquid plastic is cast on the surface of a base strip to form a liquid protrusion, and then heated to form a semi-gel-like fluidity, Production of a decorative molding characterized in that the protruding stripes are integrally formed on the surface of the base strip by pressurizing and deforming a part of the semi-gel-like protruding sections and heating and hardening them again. Method. 2. The method of manufacturing a decorative molding according to claim 1, wherein a printing or embossed pattern is applied during pressurization.