JPS6113386Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a string-like side molding that is attached to the side of an automobile from the front to the rear.

In recent years, side moldings made of synthetic resin have been frequently used on the side surfaces of automobiles, especially passenger cars, to protect and decorate the car body. Many have an adhesive layer on the bottom of the molded body using double-sided adhesive tape or the like. However, although these soft vinyl chloride materials are flexible and highly elastic, they undergo large dimensional changes due to thermal history. Especially in winter or in cold regions, the side moldings may shrink in the longitudinal direction due to thermal contraction. This shrinkage stress causes the adhesive layer to be destroyed at the end of the molding, resulting in a disadvantage that the adhesive layer is likely to peel off or fall off from the vehicle body.

This idea faced many difficult installation problems, as it was exposed to harsh natural conditions on the outside of the car body, and was itself long and slender, so it was attached to the car body using an adhesive such as adhesive. This side molding suppresses the shrinkage of the molding body due to natural conditions, especially thermal history, and increases its mounting strength.It also has excellent cushioning properties, which are the original function of the molding, and is lightweight and easy to decorate. The purpose is to provide the following.

The specific structure of this invention will be explained below with reference to the attached drawings. FIG. 1 is a sectional view of a side molding 10A showing one embodiment of this invention, and FIG. 2 is a sectional view of a side molding 10B showing another example. It is a diagram. As illustrated, side moldings 10A, 1 according to this invention
0B is a core material 11, an outer shell 12, and an adhesive layer 14.
It consists of various parts.

The elongated core material 11, which has an appropriate shape such as a semicylindrical or mountain-shaped cross section, is made of an elastic foam having a closed cell structure made of soft vinyl chloride resin, rubber, or a mixture thereof.

The entire outer surface of the core material 11 is integrally covered by an outer shell 12 made of a non-foamed synthetic resin that is compatible with the foamed synthetic resin constituting the core material 11. The outer shell 12 has a smooth bottom surface 13 continuous in the longitudinal direction for forming an adhesive layer to be described later.
For example, if the core material 11 is a foam made of vinyl chloride resin, the outer shell 12 is formed of vinyl chloride resin or a mixture thereof with rubber, ABS resin, or the like. On the decorative side surface of the outer shell 12,
Decorations such as crest patterns or wood grain patterns may be applied as needed. FIG. 2 shows an embodiment in which decorative metal foils 20 of aluminum, stainless steel, etc. are attached to both sides of the main body of the side molding 10B having a chevron-shaped cross section.

An adhesive layer 14 is formed on the smooth bottom surface 13 of the outer shell 12, which serves as a mounting portion to the vehicle body. This adhesive layer 14 can be formed using an adhesive such as butyl rubber or a double-sided adhesive tape.

In addition, in order to further improve the cushioning properties of the side molding, the density of the synthetic resin foam that becomes the core material 11 should be increased.
It is desirable that the specific gravity be 0.7 to 0.85, and that the apparent specific gravity when combined with the outer shell 12 be approximately 1.0.

Since the side molding according to this invention has the configuration described above, it enjoys the following effects.

First, since elastic foam is used as the core material of the molding, it is possible to not only provide a side molding with excellent cushioning properties, but also to prevent thermal contraction in the longitudinal direction that can cause an outer shell in cold weather. The shrinkage stress is changed into bending stress and dispersed inside the foam by the three-dimensional structure of the cell walls of the foam core material integrally formed inside the outer shell.
Shrinkage stress in the longitudinal direction of the molding is reduced or relaxed, and shrinkage of the side molding body can be prevented. Therefore, it is possible to eliminate the above-mentioned disadvantages of peeling and falling off of the molding caused by destruction of the adhesive layer at the ends of the molding due to shrinkage of the molding.

In addition, by using foamed synthetic resin as the core material, the apparent specific gravity of the entire molding can be lowered, making the molding lighter and reducing stress on the adhesive surface of adhesive tape, etc., improving durability. In addition, it becomes possible to easily increase the size of the side molding.

Furthermore, since the surface of the side molding is integrally covered with an outer shell made of non-foamed synthetic resin that is compatible with the foamed synthetic resin that makes up the core material, it has good shape retention during molding. It is large and has excellent appearance retention properties during use. In addition, it is easy to form a shibori pattern or a wood grain pattern, and to form a metallic luster layer as described in the examples, and has excellent decorative workability.

In addition, since the bottom surface of the outer shell, which serves as the attachment portion of the side molding, is made of a smooth non-foamed synthetic resin, it is easy to bond the side molding at the time of attachment, and a strong bond is possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the side mold of this invention, and FIG. 2 is a sectional view showing another embodiment. 10A, 10B... Side molding, 11... Core material, 12... Outer shell, 13... Smooth bottom surface, 14...
Adhesive layer, 20...metal foil.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A long core material made of foamed synthetic resin; Made of non-foamed synthetic resin that is compatible with the foamed synthetic resin constituting the core material, and which covers the entire outer surface of the core material. A side molding for an automobile, comprising: an outer shell having a smooth bottom surface that is integrally covered and continuous in the longitudinal direction; and an adhesive layer formed on the smooth bottom surface of the outer shell. 2. The side molding for an automobile according to claim 1, wherein the core material is made of foamed vinyl chloride resin and the outer shell is made of non-foamed vinyl chloride resin.