JPS5812842B2 - Molding edge finishing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A rod-shaped decorative material of a predetermined length that is attached to an object to be decorated for the purpose of decorating articles such as side moldings, body seal moldings, bumper guard moldings, etc. of passenger cars, the main body of the decorative material being Moldings made primarily of synthetic resin are usually made by continuously molding a rod-shaped body by extrusion molding of synthetic resin, and then cutting the rod-shaped material into a predetermined length required as a product.

Therefore, since it is not aesthetically pleasing to leave the cut ends as they are, it is common practice to finish both ends by attaching end members (end caps) that are separately made in an appropriate shape.

The present invention provides an advantageous method for finishing the end face.

In order to attach this molding to the object to be decorated, a metal strip that also serves as reinforcement of the product is adhered to the back side of the synthetic resin molding, and a double-sided adhesive tape or adhesive layer is attached to one side of this metal strip. The molding is attached to the object to be decorated through.

The end face finishing method of the present invention uses the metal strips described above to extremely easily fix end face parts.

The details of the present invention will be explained below with reference to the accompanying drawings.

In the figure, 1 (general term for 1a and 1b) is a resin molding body of a predetermined length obtained by extrusion molding a soft synthetic resin such as soft vinyl chloride, and has a cross section that creates a surface 11 with a decorative effect. have a shape

12 is a metal-colored strip such as a thin metal strip, aluminum foil, stainless steel foil, or polyester film with vacuum-deposited metal, which is extruded and integrally combined with a synthetic resin material during extrusion molding of the main body, and is extruded for molding. 3 shows a strip-shaped portion with metal optics.

Both side edges of the metal-colored strip 12 are covered with synthetic resin to prevent peeling.

The back surface 13 of the resin molding main body is made flat in order to be attached to an object to be decorated, and the present invention is characterized in that a continuous back groove 14 is formed in this portion.

The back groove 14 can be easily formed by changing the shape of the extrusion die when extruding the resin molding material.

A metal strip 3 such as an aluminum strip or a steel plate strip is adhered to the back side 13 of the resin molding body, on which a pressure-sensitive adhesive layer 4 is formed by pasting a pressure-sensitive double-sided adhesive tape or applying an adhesive. ing.

Reference numeral 40 indicates a release paper attached to the adhesive layer 4.

The molding body 1 to which the IJ sprue 2 is bonded is made by extruding a molding material, cutting it into a predetermined length, gluing a metal strip cut to the same length, or extruding it. It can be obtained by gluing a continuous metal strip to an infinite length resin molding material and then cutting it to a predetermined length, but the most efficient manufacturing method is to glue it when extruding the resin molding material. The metal strip 3 to be processed is extruded from the inlet side of the molding material extrusion machine C (Fig. 9) through an extrusion die (not shown).
The infinite length molding material M obtained by extruding the combined synthetic resin extrusion molded body and metal strip from an extrusion die is cut into a predetermined length.

FIG. 9 3' shows a metal strip fed out from an uncoiler, A is an adhesive application roller, B is a drying device, and D is a traveling cutter.

A continuous cavity 2 is formed in the molding body by the back groove 14 formed in the resin molding body 1 and the metal strip 3.

Next, the end face member 5 (general term for 5a, 5b, and 5c) will be explained.

The end face member 5a, only a vertical side view of which is shown in FIG.
The other end surface is formed into an abutment surface (usually a flat surface) 52 that matches the cut end surface of the molding body, and the shape of the abutment surface 52 is the same as the end face shape of the molding body to which the metal sprue 3 is adhered. .

The end member 5 can be easily made by injection molding a synthetic resin material such as vinyl chloride or acrylic resin into a predetermined shape.

In the present invention, the protrusion 6 (6a, 6a,
6b, 6c) are formed to protrude.

The protrusion 6a in FIG. 2 is integrally formed when the end member 5a is injection molded.

The cross-sectional shape of the protrusion 5a is made to be approximately equal to the cross-sectional shape of the cavity 2, and a toothed portion 61 for preventing extraction is formed on the top or side surface of the protrusion 5a.

The section where the toothed portion 61 is formed is made somewhat larger in cross-section than the other sections.

Since the bottom surface 62 of the protrusion 6a is useful for determining the mounting position of the end member using this as a reference, the positional relationship of each part of the end surface of the molding body with respect to the top surface of the metal strip 3 and the bottom surface 62 at precisely set positions so that the relationship between each part of the contact surface of the end face member matches.

This condition can be satisfied by accurately manufacturing a mold for molding the end member.

When the end member 5a is pushed into the cavity 2 of the molding body made of soft synthetic resin as shown in FIG. 2, the toothed portion 61 engages with the inner peripheral surface of the cavity and prevents it from being pulled out.

Therefore, the end face drawing material is firmly fixed to the end face of the molding body, and the end of the molding is decorated with the design surface 51.

The end member 5b shown in FIG. 3 has a protruding portion formed by protruding both legs of a metal plate insert member 6b having a substantially U-shaped side surface from the abutting surface 52 of the synthetic resin main body as before.

When the end member 5b is injection molded, the U-shaped connecting portion 63 of the insert member is embedded and molded into the main body of the insert member, so that the protruding portion 6b can be easily produced.

An extraction prevention claw 64 or 65 is provided on the top or side surface of the protrusion 6b.
form a protrusion.

The back surface 62 of the protrusion is precisely positioned and embedded as described above.

Furthermore, by making the outer periphery of the front surface of the protrusion 6b coincide with the cross-sectional shape of the cavity 2, the protrusion 6b can fit tightly into the cavity 2.

When this protrusion 6b is pushed into the cavity 2 of the molding main body 1a, which is the same as that shown in FIG. 2, as shown in FIG. The end face member 5b is firmly fixed to the cut end.

FIG. 5 shows an example of an end face member in which a protrusion 6c of a different type is formed.

The end member 5c is provided with a recessed hole 53 having a bottom surface 54 such that when its abutment surface 52 is aligned with the cut end of the molding body, the bottom surface 54 is in the same plane as the top surface of the metal strip 3. One end of the insertion piece 6c, which has opposite extraction prevention claws 66 and 67 cut out from both ends thereof, is inserted into the recessed hole 53 and fixed, and the other end is a protrusion.

The front shape of the recessed hole 53 is preferably made approximately equal to the cross-sectional shape of the flat cavity 2 provided in the molding body 16, and like the bottom surface 54, both sides of the recessed hole 53 can be aligned with both sides of the cavity 2'. Make it like this.

If the protrusion 6c is pushed into the cavity 2 in this way, the end member 5c
is firmly attached to the cut end of the molding body 1b.

In the end face member 5 described above, as long as the position of the protruding portion 6 is accurate, the end face member attached to the molding body will not be misaligned.

Further, the tooth shape or extraction preventing claw of the protruding portion 6 will not dig into the soft synthetic resin peripheral surface of the cavity 2 and the end member 5 will not be extracted.

The bottom surface of the end member 5 may have an adhesive layer formed thereon like the molding body as shown in FIG. 2 or FIG. 6, or may not be provided with an adhesive layer as shown in FIG. 4.

By removing the back release paper 40 and press-bonding the pressure-sensitive adhesive layer 4 to the panel 7 of the object to be decorated, the molding can be easily fixed to the surface of the object to be decorated.

As shown in FIG. 8, the end cap attachment means in Jurai's molding was to adhere the abutting surface of the end cap 9 to the end surface of the molding body 8, so that misalignment was likely to occur during adhesion. [Also, there were many inconveniences such as the adhesive surface peeling off and the end cap falling off, but according to the present invention, such inconveniences are resolved as described above.

In addition, various types have been proposed in which the end cap and the main body are fitted together to connect them, but all of them have complex structures and tend to require a lot of work and labor to process and fit, resulting in high costs. .

On the other hand, according to the method of the present invention, the end face finishing can be completed by simply pushing the end face member made by injection molding into the molding body obtained by the extrusion molding process and the cutting process, which is extremely efficient. It is true.

[Brief explanation of drawings]

Figure 1 shows an example of the molding body Figure 2 - ■
2 is a partial vertical sectional side view of one end of Mauldein taken along lines 1 and 1 in FIG. 1, FIG. 3 is a perspective view illustrating different end members, and FIG. 5 is a perspective view illustrating a different type of end member, and FIG. 6 is a second view of the molding with the end member of FIG. 5 attached. A similar cross-sectional view, Figure 7 is a cross-sectional view of the molding attached to the object to be decorated, Figure 8 is a cross-sectional view similar to Figure 2 showing an example of a conventional product, and Figure 9 is a molding material extrusion molding. It is an explanatory diagram showing an example of a process. 1... Molding body, 2... Cavity, 3...
Metal sp} IJ sp, 4... Adhesive layer, 5... End face member, 6... Protrusion part.

Claims (1)

[Scope of Claims] 1. A back groove 14 continuously formed on the back side of a resin molding material made of soft synthetic resin with a predetermined cross-sectional shape and the back surface of the resin molding material by means of A1, A2, or A3 below. obtaining a molding body of a predetermined length in which a cavity 2 is formed by a metal strip 3 forming a pressure-sensitive adhesive layer 4 adhered to the metal strip 3;
3. A method for finishing an end face of a molding comprising the step of pushing and fixing the protrusion 6 of the end face part 5 made by the method of item 3 into the cavity 2 of the end face of the molding main body. A metal strip 3 is introduced from the inlet side of an extrusion molding machine for A1 molding material, and a resin molding material having a predetermined cross-sectional shape and a back groove 14 on the back side is bonded to the back surface of the resin molding material. A step of integrally extruding the metal strip 3 from an extrusion die, and a step of cutting the extruded molding material M into a predetermined length. A2 A process of extruding a resin molding material having a predetermined cross-sectional shape and a back groove 14 on the back side, a process of cutting the resin molding material into a resin molding body 1 of a predetermined length, and the resin molding body A process of gluing a metal strip 3 of the same length onto the back side of the metal strip 1. A step of extruding a resin molding material having a predetermined cross-sectional shape and having a back groove 14 on the back side, a step of adhering a continuous metal strip 3 to the back side of the resin molding material, and a step of adhering the metal strip. A process of cutting the molding material M into a predetermined length. B1 From the corresponding contact surface of the end member main body 5a, which has an outer end surface 51 of a predetermined shape and an abutment surface 52 of a shape equal to the cross-sectional shape of the molding main body, has an outer shape that matches the cavity 2 and has an upper and side surface. Toothed part 6 for preventing extraction on one or both sides
A step of integrally injection molding the protruding portion 6a having the numeral 1. B2 When injection molding the end member main body 56 having an outer end surface 51 having a predetermined shape and an abutment surface 52 having a shape equal to the cross-sectional shape of the molding main body, the end member main body 56 has a shape that can be tightly fitted into the cavity 2. Then, a part of the insert member 6b having an extraction prevention claw protruding from one or both of the upper surface and the side surface is embedded in the abutting surface and injection molded to form the protruding part 6b. B3 has an outer end surface 51 having a predetermined shape and a contact surface 52 having a shape equal to the cross-sectional shape of the molding main body, and the corresponding contact surface 5
2, an end face member 5 formed with a recessed hole 53 having a bottom surface 54 that matches the upper surface of the metal strip of the molding body;
c is injection molded, and one end of the insertion piece 6c provided with pull-out prevention claws 66, 67 at both ends is inserted into the recessed hole 53 to form the protrusion 6c.
form. 2. A molding end face finishing method according to claim 1, wherein the resin molding body is a soft vinyl chloride extrusion molded product.