JPS6357204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a composite by bonding a covering member to a pre-molded rubber or synthetic resin member by molding, leaving a portion of the surface thereof intact.

Conventionally, the method for manufacturing this type of composite has been to adhere a film-like or plate-like glittering member for decoration etc. to a part of the surface of a pre-formed rubber or synthetic resin molded product, and then to place it in a mold. The conventional method has been to install the glitter member in a cavity, inject rubber or synthetic resin compatible with the molded body into the cavity, and cover the other parts of the molded body, leaving only the necessary parts of the glittering member. However, this method requires that both materials to be composited be compatible and of the same quality, and there is also the problem that sufficient bonding strength cannot be obtained because the preformed members are cold.

To solve this problem, a method has been adopted in which a large number of holes and grooves are bored on the surface of preformed parts, and the material to be bonded flows into these holes and grooves to strengthen the bonding force. There is. However, with this method, the number of man-hours required to drill holes and grooves in the pre-formed member increases, and the drilling process may be difficult due to restrictions on the shape and size of the formed member. There is a problem in that the size and shape of the groove cannot be freely selected in order to improve the bonding force.

Therefore, the present invention provides a method for manufacturing a composite that does not require gluing a glittering member to a pre-formed member or drilling holes or grooves, and that provides a strong bond even when coated with incompatible materials. The purpose is to provide

In the present invention, first, a rubber or synthetic resin molded body having through holes or grooves in the longitudinal direction and covered with a film-like glittering member whose surface is partially continuous in the longitudinal direction is integrally extruded. Next, this molded body is cut into a predetermined length. Then, the entire cut molded body is set in a mold, and rubber or synthetic resin is injected into the mold to fill the through holes or grooves of the molded body, and the molded body is left with the necessary portion of the bright member remaining. cover other parts of the

According to the present invention, the injected covering member is firmly bonded to the molded body in the through holes or grooves of the extrusion molded body, so that the covering member can be freely selected from materials that are incompatible with the extruded molded body. Can be done.

Furthermore, since the bright member is extruded integrally with the molded body, no adhesion process is required, and the through holes and grooves that connect with the covering member are formed during extrusion molding, so no hole-drilling or groove-forming process is required.

An example in which the present invention is applied to the manufacture of a bumper guard for an automobile will be described below.

In FIG. 1, reference numeral 1 denotes a metal bumper body, and bumper guards 2 for shock absorption are attached to both front sides of the body 1. This bumper guard 2 is made up of a first member 3 with a decorative glittering member adhered to one surface, and a second member 4 that is joined to wrap around the member 3 and becomes an attachment part to the bumper body 1. It is a composite molded product consisting of

When manufacturing this bumper guard 2,
Figures 2 and 3 are made by extrusion molding of vinyl chloride resin.
As shown in the figure, it has a convex cross section and openings 5 at both ends in the longitudinal direction.
1 in which a through hole 5 having a rectangular cross section is formed.
The member 3 is manufactured. The first member 3 has, on the surface of its protrusion, a luminescent member 6 made of Tedramaira film (trade name: Dupont), which is made by depositing aluminum on a transparent polyester resin film and providing a vinyl fluoride film layer on the surface. company)
etc. are bonded together by simultaneous extrusion molding. Next, as shown in FIG. 4, the entire first member 3 whose protrusions are covered with the glittering member 6 is placed in the cavity 8 of the mold 7 in which the second member 4 is to be molded. Thermoplastic rubber is injected through the injection passage 81 to cover both side edges of the glittering member 6 and the extruded resin molding. At this time, the thermoplastic rubber also flows into the through hole 5 and fills it, so that the member 3 and the second member 4 are firmly connected in the through hole 5 of the first member 3, as shown in FIG. A bumper guard 2 is obtained in which the glitter member 6 is exposed on the surface.

Therefore, in this bumper guard, the second member 4 is filled in the through hole 5 and is firmly connected as described above, and the through hole 5 is formed when the first member 3 is extruded. The manufacturing process can be simplified without requiring a process for drilling.

Further, in the present invention, the shape of the through hole 5 is not limited to a square cross section, but can be formed into various shapes to improve the bonding strength. Further, as shown in FIG. 6, if holes 51 are opened at various locations in the through hole 5 through the side surface of the first member 4 during extrusion molding, the bond between the two members 3 and 4 can be further strengthened. . Further, depending on the shape of the first member, a groove may be formed on the side surface instead of the through hole 5, and the cross-sectional shape of the groove may be a hook shape or the like to strengthen the connection of the second member 4. It can be made into various shapes such as. Moreover, since a strong connection can be achieved by variously selecting the shapes of the joint portions of both members 3 and 4, the first member 3 and the second member 4 can be freely selected without being limited to those that are compatible with each other. Materials can be used depending on the purpose. Furthermore, by using materials with different colors, the design effect of the product can be enhanced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an automobile bumper having a bumper guard according to the present invention, FIG. 2 is a longitudinal cross-sectional view of an extruded member constituting the bumper guard, FIG. 3 is a cross-sectional view taken along the line - in FIG. FIG. 4 is a cross-sectional view of a mold for forming a covering member on an extruded member, FIG. 5 is a cross-sectional view of a bumper guard obtained according to the present invention, and FIG. 6 is a cross-sectional view of another bumper guard obtained according to the present invention. FIG. 3 is a cross-sectional view of the bumper guard. DESCRIPTION OF SYMBOLS 1...Bumper main body, 2...Bumper guard which is a composite body, 3...Extruded member, 4...Coating member, 5...Through hole of extruded member, 7...Mold,
6... Bright member.

Claims (1)

[Claims] 1. A rubber or synthetic resin molded body having through holes or grooves in the longitudinal direction and covered with a film-like glittering member whose surface is partially continuous in the longitudinal direction is integrally extruded, and the molded body is molded in a predetermined manner. Cut it to the length of
The entire cut molded body is set in a mold, and rubber or synthetic resin is injected into the mold to fill the through holes or grooves of the molded body, and the molded body is filled with the necessary part of the bright member remaining. A method for producing a rubber or synthetic resin composite, which comprises covering other parts.