JPH0140659Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to improvements in synthetic resin moldings such as body side moldings attached to the body of an automobile.

Prior Art Conventionally, when manufacturing this type of synthetic resin molding, as shown in FIGS. When extrusion molding into the surface shape, a core material 2 such as a strip of aluminum foil or a polyethylene terephthalate resin sheet is integrally embedded in the longitudinal direction of the material to provide dimensional stability and rigidity. ing. The molding material extruded together with the core material 2 is cut to a certain size, and then an end cap 3 is integrally attached to the end where the cut surface of the core material 2 is exposed by injection molding. It is said that

Problems that the invention aims to solve However, this synthetic resin molding was attached to the car body panel P with double-sided adhesive tape T, and +90
When a thermal cycle test is applied in which the molding body 1 is repeatedly exposed to high and low temperatures from ℃ to -40℃, the resin forming the molding body 1 shrinks as shown in Fig. 9, and as a result, the relatively rigid core shrinks. The material 2 is approximately 0.5 to 0.8 from the end surface of the molding body 1.
It may protrude by about mm. This protrusion of the core material 2 acts to push out the end cap 3 from the end surface of the molding body 1, causing it to peel off, and a gap may be created between them.

Means for Solving the Problems In the synthetic resin molding for vehicles according to the present invention, a core material made of a hard material embedded in the longitudinal direction of the molding body is partially inserted from the back side on the terminal side of the molding body. It is constructed by cutting out the molding body and integrally molding an end cap on the end side of the molding body.

Effects With this synthetic resin molding, even if the resin that forms the molding body shrinks, a portion of the core material is cut off at the end of the molding body, so the core material is removed from the end face of the molding body. Since it does not protrude, there is no pressure to peel off the end cap that is integrally molded on the end side of the molding body.

Embodiments The following description will be made with reference to FIGS. 1 to 6.

This molding for a vehicle consists of a molding main body 1 and an end cap 3. Similar to the conventional example, the molding main body 1 is extruded from a synthetic resin such as polyvinyl chloride, and the inside thereof is covered with a strip of aluminum foil or an end cap. A core material 2 such as a sheet made of polyethylene terephthalate resin is embedded and mounted continuously along the longitudinal direction.
Furthermore, an end cap 3 made of synthetic resin is integrally molded on the end side of the molding body 1, and the end cap 3 is finished. An end cap 3 made of synthetic resin is molded onto the end of the main body 1, and the end cap 3 finishes the end.

In the synthetic resin molding, a part of the core material 2 is cut away by providing a cut groove 4 from the back surface of the molding body 1 near the end thereof, as shown in FIGS. This kerf 4 is provided with a constant width in a direction perpendicular to the longitudinal direction to a depth that cuts the core material 2 buried inside the molding body 1, and it is sufficient to provide one kerf 4. It is more preferable to provide a plurality of them.

This cutting of the core material 2 can also be carried out by hollowing out a constant width and a predetermined thickness from the back surface of the molding body 1 from the end thereof, as shown in FIGS. 3a and 3b. The hollowing can be easily formed by positioning the rotating metal saw S to a certain depth from the bottom side and then moving it a certain length in the longitudinal direction of the molding body 1. By this hollowing, a groove 5 can be formed on the bottom surface of the molding body 1, and the core material 2 is cut out at that portion. An end cap 3 can be formed on this molding body 1 using an injection molding die C as shown in FIGS. 4a and 4b. When molding the end cap 3, a baffle plate G is protruded into the mold C, and a gap 6 is created between the end cap 3 and the exposed end surface of the core material 2 by pressing the synthetic resin that is filled and fixed in the groove 5. can be provided. This gap 6
5, the groove 5 can be formed with a large curved surface to increase the contact area with the synthetic resin forming the end cap 3.

The synthetic resin molding constructed in this manner can be fixed to the vehicle body panel P using double-sided adhesive tape T shown in FIGS. 1 and 4b or a liquid adhesive. Even if the main body part 1 shrinks due to the synthetic resin molding, the core material 2 is cut out, so the end cap 3 can be molded by absorbing the dimensional difference with the core material 2 due to the shrinkage of the molding main body 1. There is no effect of peeling off from the end of the main body 1. In addition, when the molding main body 1 is contracted, the end side of the molding body 1 is made more flexible due to the notch, so it can better follow the panel surface of the vehicle body, and it also has the effect of preventing it from peeling off from the vehicle body panel P. can.

Incidentally, in all of the embodiments described above, a gap was provided by cutting the core material 2 to prevent the core material 2 from protruding, but in the case of the embodiments shown in FIGS. 4 and 5, the end cap 3 was removed as shown in FIG. As shown, the end cap 3 is formed by completely fitting into the groove 5.
Since the core material 2 can be firmly fixed, peeling can be prevented from occurring against the protrusion of the core material 2.

Effects of the invention As described above, according to the synthetic resin molding according to the invention, the end cap does not peel off even if the molding body contracts, so it is possible to maintain a good appearance for many years. become.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a synthetic resin molding in an installed state according to an embodiment of the present invention, Fig. 2 is a rear perspective view of the molding, and Figs. 3 a and b.
4 is an explanatory diagram showing a manufacturing process of a molding according to another embodiment, FIG. 4a is an explanatory diagram of a molding process of attaching an end cap to the molding shown in FIG. 3, and FIG. 5 and 6 are side sectional views of a molding according to another embodiment, and FIGS. 7 and 8 are explanatory views showing the structure of a molding according to a conventional example. 9 are explanatory diagrams showing problems with the same molding. 1: Molding body, 2: Core material, 3: End cap, 4, 5: Cutout portion of core material.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A core material made of hard material buried in the longitudinal direction of the molding body is partially cut off from the back side on the terminal side of the molding body, and an end is placed on the terminal side of the molding body. A synthetic resin molding for vehicles that is made by integrally molding the cap. (2) The synthetic resin molding for a vehicle according to claim 1, wherein the core material is partially cut out by providing a cut groove from the back side of the molding main body. (3) The synthetic resin molding for a vehicle according to claim 1, wherein the core material is cut out by hollowing out a portion of the back surface from the end side of the molding body.