JP2006219115A - Long ornamental molding and manufacturing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long ornamental molding whose design surface is colored with deepness, that is, profundity and a manufacturing method for it. <P>SOLUTION: This long ornamental molding 10 has a head part 11 composed of a body part 13 and a cover layer 12 laminated thinner than the body part on the surface of the body part, and a fitting leg part 15 formed to project from the back of the head part. The body part is formed of olefin-base thermoplastic elastomer material with which a filler is mixed to be elastically deformable, and the cover layer is formed of random polypropylene resin material which has a higher hardness than the material forming the body part and with which a coloring agent is mixed. The cover layer is formed with a thickness enough to allow elastic bending and/or twisting of the body part and also with a substantially uniform thickness enough to enable see-through of the interior on the surface side of the cover layer from the outside and inhibit see-through of color of the body part surface through the cover layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a long decorative molded product to be mounted on a vehicle such as an automobile, a building, and the like, and a manufacturing method thereof. Specifically, the present invention relates to a long decorative molded product having a decorative color on a design surface and a manufacturing method thereof.

Various long molded products, also called moldings or moldings, are used as automotive exterior parts and building construction parts. This type of molded article is typically manufactured by molding a thermoplastic molding material such as a thermoplastic resin material or a thermoplastic elastomer material into a desired long shape by means such as extrusion molding.
By the way, in the case of a long shaped product (hereinafter also referred to as “decorative molded product”) in which at least one of the purposes of use is decoration, the design surface (the surface visually recognized from the outside when attached to a predetermined attached body) is used. The same shall apply hereinafter)). For example, various decorative molded products (for example, a roof molding mounted on the roof groove of a vehicle) attached to the outer surface of a vehicle such as an automobile are preferably colored in a color that does not impair the aesthetics at the attachment site.

A common means for coloring is painting. The coating is performed by applying a desired paint to the surface of a molded product that has been previously formed into a long shape. However, providing a separate coating process after molding of the molded product may complicate the entire manufacturing process of the molded product and increase the manufacturing cost. In particular, a design surface molded from an olefinic thermoplastic polymer material, which has been increasingly used in recent years due to environmental considerations, is inherently poor in paint adhesion, and various pre-treatments before painting a desired color ( Activation process) must be performed, and as a result, the manufacturing process may be further complicated and the manufacturing cost may increase. For example, Patent Document 1 describes an automotive molding in which a desired coating is applied to a design surface made of a specific resin composition that can be easily applied.
In addition, in the coloring process by coating that is practically possible, the thickness of the coating film on the surface (that is, the final coating film in the case of multi-layer coating) is limited to a few tens to several tens μm at most, so that a depth or deep coloring is realized. Not. Furthermore, after coating is performed on a design surface (for example, a design surface mainly composed of an olefin-based thermoplastic polymer material) of a molded product formed in a substantially linear shape, the molded product is subjected to a predetermined attached body (for example, If it is attached to a part of a vehicle body such as a roof panel in a bent and / or twisted state, excessive tensile or compressive stress is generated in the coating film, and the coating film is damaged such as cracks and chips. May occur.

On the other hand, as a coloring means not based on painting, a design portion can be formed by extrusion molding or the like from a molding material obtained by mixing a pigment or the like with a polymer material (for example, an olefinic thermoplastic polymer material). For example, Patent Document 2 describes a vehicular molding including a design portion formed of a molding material obtained by mixing a pigment or the like with a synthetic resin material containing an ethylene-α-olefin copolymer as a main component.
However, the means for forming a colored design portion from a molding material mixed with a conventional pigment or the like as described in Patent Document 2 uses a large amount of a colorant such as an expensive pigment as compared with a resin material. It becomes a factor of high manufacturing cost. In addition, the entire design portion tends to be monotonous, and coloration with a depth on the design surface, that is, a depth, is not realized as in the case of conventional coating.

JP 2003-285699 A JP 2001-233143 A

  The present invention was created in order to solve the conventional problems related to the coloring of the above-mentioned long shaped molded article, and the purpose thereof is a long decorative molded article having a depth, that is, a deep coloring applied to the design surface. It is to provide a manufacturing method thereof. Another object is a long length mainly made of an olefin-based thermoplastic polymer material that is colored with such depth and that can follow bending and twisting (that is, elastic deformation). It is to provide a decorative molded article and a method for producing the same.

The present invention provides long decorative molded articles listed below.
In other words, the invention of claim 1 is directed to a head comprising: a main body formed in a predetermined cross-sectional shape; and a cover layer laminated and integrated on the surface of the main body thinner than the main body; This is a long decorative molded article having mounting legs formed so as to protrude from the back surface of the head in order to attach the part to a predetermined attached body. Here, the main body is molded from an elastically deformable olefin-based thermoplastic elastomer material in which a filler is kneaded. The cover layer is molded from a random polypropylene resin material having a higher hardness than the material for molding the main body and kneaded with a colorant, and permits elastic bending and / or twisting of the main body. The thickness of the cover layer can be seen through from the outside through the surface of the cover layer, but the cover layer is formed to have a substantially constant thickness sufficient to prevent the color of the surface of the main body from being seen through. Yes. When the decorative molded product is attached to a predetermined attached body while the longitudinal axis of the main body is bent and / or the axis is twisted so that the cover layer side is convex, the cover layer Is stretched to be able to follow the twisting and / or bending of the main body part integrally.
Here, the term “random polypropylene resin material” means a random copolymer mainly composed of propylene monomer (no regularity is found in the bonding order (arrangement order) of two or more monomer units constituting the polymer molecule). Copolymer), and the content (copolymerization ratio) of the propylene monomer in the copolymer is not particularly limited. For example, it is a concept that includes polypropylene random copolymer (isotactic polypropylene, syndiotactic polypropylene, and atactic polypropylene) containing propylene as a monomer component in an appropriate amount (for example, 10% by mass or less of the whole polymer) of ethylene. .) Is a typical example included in the “random polypropylene resin material” mentioned here.
Further, in the long decorative molded product disclosed herein, the “head” generally refers to a portion that is disposed outside the attached body when the molded product is attached to a predetermined attached body. The term is not limited to a specific shape. On the other hand, the `` mounting leg portion '' for the long decorative molded product disclosed herein refers to a portion including a portion that is locked to the attached body side when the molded product is attached to a predetermined attached body, Typically, such an attachment leg portion may be a portion that is shielded by the head and / or the attachment body and cannot be seen from the outside when the molded product is attached to the attachment body.

In the long decorative molded article according to claim 1, as described above, the random polypropylene resin material having a specific thin thickness and a lower crystallinity than other polypropylene resin materials (for example, homopolypropylene resin material, block polypropylene resin material). A cover layer mainly composed of is formed. For this reason, the said cover layer does not inhibit the bending and twist of a main-body part, and can follow the said bending and twist. Therefore, according to the molded product of the first aspect, it is possible to easily perform the attaching operation with elastic bending and / or twisting to the attached body.
Further, in the molded article according to claim 1, as a result of the specific amount of the colorant being kneaded with the random polypropylene resin material constituting the cover layer as described above, the cover layer is translucent when viewed from the outside (that is, the surface layer portion is This refers to the transparency of the level that can be seen through but the surface of the main body is not visually recognized. For this reason, in the cover layer, it is possible to realize a decorative effect of a color tone having a depth, that is, a depth.
In the molded product according to claim 1, since the cover layer is harder than the main body, the surface is hardly damaged and the wear resistance is improved. Therefore, the decorative effect desired as a molded product can be maintained over a long period of time.

  The invention of claim 2 is the molded product of claim 1, wherein the main body portion is 0.5 to 10% by mass of carbon black (the percentage when the total material constituting the main body portion is 100% by mass. Same :) Kneaded and colored black. According to the molded article of claim 2, in addition to the effect of the molded article of claim 1, the concealability of the main body when viewed from the cover layer side can be further improved. Moreover, the weather resistance of the main body can be further improved.

According to a third aspect of the present invention, in the molded product of the first or second aspect, the thickness of the cover layer is not more than 10% of the maximum thickness portion in the cross section of the main body and is 0.05 to 0.4 mm. The range is set.
According to the molded article of claim 3, in addition to the effect produced by the molded article of claim 1 or 2, the followability of the cover layer to the bending and / or twisting of the main body is further improved, and the bending and / or Or the effect that the attachment operation | work to a to-be-attached body accompanying a twist can be implemented preferably is acquired.

According to a fourth aspect of the present invention, in the molded article of the third aspect, the thickness of the cover layer is set in the range of 0.1 to 0.3 mm.
According to the molded product of the fourth aspect, it is possible to obtain the followability with respect to the bending and / or twisting of the main body which is preferable for the mounting work to the mounted body, while maintaining the colorability and / or concealment of the cover layer.

According to a fifth aspect of the present invention, in the molded product according to any one of the first to fourth aspects, the widthwise end of the main body has a portion exposed in the longitudinal direction without being covered by the cover layer. When attached to the attachment body, the exposed portion in the longitudinal direction of the main body portion is in contact with the attached body, while the cover layer is configured to keep non-contact with the attached body.
According to the molded product of claim 5, in addition to the effect of the molded product of any of claims 1 to 4, there is a problem (typically due to a cover layer that is harder than the main body contacting the body to be attached. The effect that the generation | occurrence | production of a damage | wound and a dent in a to-be-attached body can be prevented is acquired.

According to a sixth aspect of the present invention, in the molded product according to any one of the first to fifth aspects, at the longitudinal end, the main body portion and the cover layer are bent in the direction of the mounting leg portion while maintaining a laminated state. Is.
According to the molded product of claim 6, in addition to the effect of the molded product of any one of claims 1 to 5, the appearance of the end portion in the longitudinal direction is improved without adding another member such as a cap ( For example, the cross section of the main body portion is not exposed at the end portion, or a seam that is generated when another member such as a cap is used), and the effect of reducing the number of parts and the work process can be obtained. .

The invention of claim 7 is the molded article according to any one of claims 1 to 6, wherein the main body and the cover layer are co-extruded, and both have substantially the same molding shrinkage. .
According to the molded article of claim 7, in addition to the effect produced by any of the molded articles of claims 1 to 6, the cover layer for the main body during elastic deformation (including the bending and twisting, the same applies hereinafter). It is possible to obtain an effect that the following property is further improved.

The invention according to claim 8 is the molded article according to any one of claims 1 to 7, wherein the cover layer is kneaded with a light-reflective material in the form of a fine powder.
According to the molded product of the eighth aspect, in addition to the effect exhibited by the molded product according to any one of the first to seventh aspects, a decorative effect that a metallic feeling is imparted to the cover layer is obtained.

The invention of claim 9 is the molded article of claim 8, wherein the fine powdery light reflective material is at least one selected from the group consisting of mica, aluminum and nickel.
According to the molded product of the ninth aspect, an excellent decorative effect that a metallic feeling with a particularly high brightness is imparted to the cover layer can be obtained.

According to a tenth aspect of the present invention, in the molded article according to the eighth or ninth aspect, the average aspect ratio defined by the outer dimension / thickness of the fine powdery light reflective material is less than 5.
According to the molded product of the tenth aspect, in addition to the effect produced by the molded product of the eighth or ninth aspect, an excellent decorative effect of giving a finer metallic feeling can be obtained.

The invention of claim 11 is the molded product according to any one of claims 1 to 10, wherein the molded product is formed as a roof molding to be mounted in a roof groove of a vehicle.
In the molded product (roof molding) of claim 11, the effect exhibited by the molded product of any of claims 1 to 10 can be exhibited particularly well.

The present invention also provides the following method for producing a long decorative molded article.
That is, the invention of claim 12 is a head comprising: a main body formed in a predetermined cross-sectional shape; and a cover layer laminated and integrated on the surface of the main body thinner than the main body; The present invention relates to a method of manufacturing a long decorative molded product having mounting legs formed so as to protrude from the back surface of the head in order to attach the portion to a predetermined attached body. And this method includes the following processes. (1) melting the elastically deformable olefin-based thermoplastic elastomer material kneaded with the filler and extruding the main body, and (2) higher hardness than the material for molding the main body, and The cover layer is extruded by melting a random polypropylene resin material kneaded with a colorant (wherein the cover layer has a thickness that can allow elastic bending and / or twisting of the main body portion from the outside) The inside of the surface side of the cover layer can be seen through, but is formed to a substantially constant thickness sufficient to prevent the color of the surface of the body portion from being seen through the cover layer), and (3) The main body and the cover layer are integrally laminated by heat fusion.
And this method, when the decorative molded product is attached to a predetermined attached body while the longitudinal axis of the main body is bent and / or the axial is twisted so that the cover layer side is convex, This is a method for producing a long decorative molded product in which the cover layer is stretched so as to be able to follow the twist and / or bend of the main body as one body.

In the manufacturing method of claim 12, a random polypropylene resin material having a low crystallinity is used as the cover layer forming material when it is cooled and solidified from an amorphous molten state. For this reason, the axis of the molded product does not bend unexpectedly during extrusion molding, and molding can be performed while maintaining substantially linearity. Further, since the random polypropylene resin material is not easily deformed during cooling, even if the cooling rate fluctuates locally in a part of the cover layer, for example, local deformation does not occur in that part. That is, the shape stability in the cooling process is excellent.
In addition, as described above, a random polypropylene resin material is kneaded with a colorant at a level at which translucency is realized, and as a result, a decorative effect with a depth or depth in the extruded cover layer is realized. can do. Therefore, according to the manufacturing method of the twelfth aspect, it is possible to manufacture a long molded product having excellent followability of the cover layer with respect to the main body during elastic deformation and a high decorative effect.

The manufacturing method of claim 13 is the manufacturing method of claim 12, wherein the random polypropylene resin material has a melt mass flow rate (MFR) obtained by a method defined in JIS K 7210 as compared with a material for molding the main body. It is a method using a large material.
According to the manufacturing method of claim 13, in addition to the effect of the manufacturing method of claim 12, by using a random polypropylene resin material having high fluidity, the cover layer can be easily extruded into a thin wall. Is obtained.

A manufacturing method of claim 14 is the method of claim 13, wherein the melt mass flow rate (MFR) is 5 g / 10 min or more.
According to the manufacturing method of the fourteenth aspect, in addition to the effect produced by the manufacturing method of the thirteenth aspect, an effect that the cover layer can be more easily extruded into a thin wall can be obtained.

The manufacturing method according to claim 15 is the manufacturing method according to any one of claims 12 to 14, wherein the material forming the main body and the material forming the cover layer exhibit the same or substantially the same melting temperature. And the body part and the cover layer are integrally extruded by coextrusion molding using one extrusion mold.
According to the manufacturing method of Claim 15, in addition to the effect which the manufacturing method of any one of Claim 12 to 14, there exists an effect that it can extrude more efficiently.

  Hereinafter, preferred embodiments of the present invention will be described. Note that matters other than matters specifically mentioned in the present specification and necessary for the implementation of the present invention (for example, general matters relating to extrusion molding such as an operation method of an extruder) are all related to the prior art. It can be grasped as a design matter of those skilled in the art based on the above. The present invention can be carried out based on matters disclosed in the present specification and drawings and common general technical knowledge in the field.

The long decorative molded product of the present invention (hereinafter abbreviated as “long molded product”) has a head portion (design portion) composed of a main body portion and a cover layer, and a mounting leg portion. There are no particular restrictions on the presence or absence of other elements (attached parts). In addition, the cross-sectional shape of the long molded product and the area ratio between the head and the mounting leg in the cross-section can be appropriately changed depending on the use of the molded product and the shape of the mounted body (attachment part). There is no particular limitation.
For example, preferred examples of the long molded article disclosed herein include a roof molding for a vehicle such as an automobile, a door molding, a window molding, and other vehicle moldings. The area ratio with the mounting leg may vary depending on the application.

First, the material used in order to manufacture the elongate molded product of this invention is demonstrated.
The main body, which is the main part of the head of the long molded product disclosed herein, is a molding material (matrix) mainly composed of an olefin-based thermoplastic elastomer kneaded with one or more suitable fillers. Hereinafter, it is molded from “main body part molding material”). The olefinic thermoplastic elastomer material, which is a kind of olefinic thermoplastic polymer material, has an olefinic resin (for example, polypropylene and / or polyethylene) as a hard segment and is excellent in recycling characteristics. Olefin-based thermoplastic elastomer materials are excellent in thermal stability (for example, hardness stability between 60 ° C. and 100 ° C.) and weather resistance, and are light in specific gravity (for example, 0.9). Can be achieved. Olefin-based thermoplastic elastomer (TPO) having a polyolefin resin such as polypropylene or polyethylene as a hard segment and an auxiliary resin such as ethylene-propylene copolymer (EPM) or ethylene-propylene-diene copolymer (EPDM) as an elastomer component Is particularly preferred.

Further, the olefinic thermoplastic elastomer material constituting the main body may contain various subcomponents. Examples of suitable subcomponents include powdery and / or fibrous solid fillers. Any solid filler of this type can be used without particular limitation as long as it has stable physical properties (typically those conventionally used as fillers). Examples thereof include ceramic powder (including various inorganic compound powders such as talc; the same applies hereinafter), carbon powder (for example, carbon black), wood powder, ceramic fiber, and carbon fiber. Or the fibrous organic substance which consists of metal powders, such as iron powder, a plant, etc. (for example, cotton) may be sufficient. Preferred ceramic powders include powders such as oxides, silicates and carbonates (typically particle diameters of 1 to 1000 μm). Silicates include talc, clay, mica, glass beads and the like, and talc is particularly preferable from the viewpoint of improving strength. Examples of the oxide include silica, alumina, titanium oxide, zinc oxide, magnesium oxide, and pumice. Examples of the carbonate include calcium carbonate and magnesium carbonate. Moreover, as a suitable example of a ceramic fiber, a glass fiber, a boron fiber, and a silicon carbide fiber with a diameter of about 0.1-500 micrometers are mentioned, A glass fiber is especially preferable.
The content (rate) of the filler may vary depending on the type of filler used and the application of the long shaped product. Typically, it is preferable to knead the filler at a ratio of approximately 1 to 60% by mass of the entire body part molding material.
The main body molding material can contain various auxiliary components in addition to the solid filler. Examples of such auxiliary components include antioxidants, light stabilizers, UV absorbers, plasticizers, lubricants, colorants, flame retardants, dispersants, antibacterial agents, and antistatic agents.

In particular, it is preferable that carbon black is contained in the main body molding material. Although content (rate) is not specifically limited, It is preferable to knead | mix carbon black in the ratio used as about 0.5-10 mass% of the whole main-body part molding material. The main body molded from the main body molding material containing carbon black at such a content is colored black, and the weather resistance of the main body disposed outside the attached body can be improved.
In addition, by coloring the main body portion black, the decorative effect (details will be described later) of the cover layer laminated on the surface of the main body portion and the concealing property of the main body portion when viewed from the cover layer side. Be improved.

Such a body part molding material can be prepared in a desired form by various conventionally known methods. For example, a mixture of an olefinic thermoplastic elastomer material and a powdery filler in a predetermined ratio can be kneaded with a kneading extruder and extruded into a strand, and then pelletized.
Although not particularly limited, for example, in the case of a vehicle decorative molded product such as a roof molding, the hardness of the molded product obtained from the main body molding material (that is, durometer hardness according to JIS K 7215) is HDA 60 to 95 (more preferably HDA 70 to 90). For example, an olefinic thermoplastic elastomer material and other components (such as a filler) may be blended and kneaded at an appropriate mass ratio so that a molded body having such hardness can be obtained by extrusion molding.

  On the other hand, the cover layer constituting the design surface of the head of the long molded product disclosed here is mainly made of a random polypropylene resin material having a higher hardness than the main body molding material and kneaded with a colorant (matrix). The molding material (hereinafter abbreviated as “cover layer molding material”). A random polypropylene resin material, which is a kind of such olefinic thermoplastic polymer material, has a lower crystallinity than other polypropylene resin materials (for example, homopolypropylene resin material, block polypropylene resin material). Accordingly, it is possible to form a cover layer having flexibility that can withstand elastic deformation such as bending and twisting when the thickness is not more than a predetermined thickness (for example, 0.5 mm). When the cover layer made of such a material is laminated and integrated with the main body portion, the cover layer can be satisfactorily following the bending and twisting without hindering the bending or twisting of the main body portion. In addition, a molded body made of random polypropylene has high transparency, and by adding a desired amount of colorant, coloration with depth, that is, depth, is realized.

  Here, random polypropylene resin materials having various compositions can be used. For example, olefin-based thermoplastics whose melt mass flow rate (MFR) at 230 ° C. and a load of 2.16 kg according to JIS K 7210 molds the main body. A random polypropylene resin material characterized by being larger than an elastomer material is preferred. A material having such MFR of 5 g / 10 min or more (for example, 5 to 30 g / 10 min, particularly 7 to 30 g / 10 min) is particularly preferable. By using such a random polypropylene resin material having an MFR value as the main body (matrix) of the cover layer, the cover layer can be made thinner. As a preferably used random polypropylene resin material, an isotactic propylene-ethylene random copolymer obtained by using a metallocene catalyst (for example, sold under the trade name “Wintech (registered trademark) WFX4T” by Nippon Polypro Co., Ltd.) Propylene random copolymer).

Further, in the cover layer molding material, various colorants are kneaded with the main random polypropylene resin material. As the colorant, pigments and the like conventionally used for this kind of application can be used without particular limitation. Examples of suitable colorants include fine powders composed of titanium dioxide (white), titanium yellow (yellow), titanium black (black), molybdenum white (white), cobalt blue (blue), carbon black (gray to black), and the like. An inorganic pigment is mentioned.
Or insoluble azo pigments (red, yellow, orange, etc.), condensed azo pigments (yellow, orange, red, brown, purple, etc.), azo pigments such as soluble azo pigments, copper phthalocyanine blue (blue), and other phthalocyanine types Pigments, quinacridone (red) and other quinacridone pigments, isoindolinones (greenish yellow, reddish yellow) and other isoindolinone pigments, organic pigments such as dioxane violet (blue purple) and perinone / perylene (orange) Is mentioned.

Preferably, the cover layer molding material includes various light-reflective materials (typically having an average particle diameter of 1 to 100 μm, for example, 10 to 50 μm). By this, the decorative effect with a metallic feeling is provided to the design surface (cover layer surface) of the obtained long molded article.
There is no limitation on the type of light reflecting material to be used as long as such metallic feeling can be realized, but as a preferable fine powdery light reflecting material, ceramic powder or metal powder having high light reflectivity, for example, mica, aluminum, A fine powder made of nickel or the like can be used. Moreover, various glassy materials (for example, high melting point glass powder such as silica glass) can be mentioned.
Further, by using a light-reflective material (eg, mica, aluminum, nickel) having a flake-like particle shape, a metallic feeling with a particularly high brightness can be obtained, and the design surface of the resulting long molded product An excellent decorative effect can be given to the (cover layer surface). In particular, when the average aspect ratio (outside dimension / thickness) of the fine powdery light reflective material is less than 5 (typically 2 or more and less than 5, preferably 3 or more and less than 5), a finer metallic A feeling can be imparted to the design surface.
Further, the cover layer molding material can contain various auxiliary components similar to those of the main body molding material.

Such a cover layer molding material can be prepared in a desired form by various conventionally known methods. For example, a material obtained by blending a random polypropylene resin material, a colorant, and optionally a light-reflecting material at a predetermined ratio may be kneaded with a kneading extruder and extruded into a strand, and then formed into a pellet shape.
The content (rate) of the colorant may vary depending on the type of the colorant used and the application of the long shaped product (that is, a different color for each application). For example, in a roof molding, a window molding, a side molding or the like that is a vehicle exterior product, it is typically preferable to knead the colorant at a ratio of approximately 0.05 to 2% by mass of the entire cover layer molding material, It is particularly preferable to knead the colorant at a ratio of 0.1 to 1% by mass. In addition, as with the colorant, the content (rate) of the light reflective material may vary depending on the type and the use of the elongated molded product. For example, in the case of the vehicle exterior product, typically, the light reflective material is preferably kneaded at a ratio of approximately 0.01 to 1% by mass with respect to the entire cover layer molding material. It is particularly preferable to knead the light reflective material at a ratio of 5% by mass.
Although it does not specifically limit, For example, when it is a vehicle decorative molded product such as a roof molding, it is preferable that the cover layer molding material has a Rockwell hardness according to JIS K 7202-2 of HRR 70-100. For example, a random polypropylene resin material and other components (such as a colorant) may be blended and kneaded at an appropriate mass ratio so that a molded body having such hardness can be obtained by extrusion molding.

Since the mounting leg portion of the long molded product disclosed herein can take different shapes and physical properties (for example, elasticity) depending on the structure of the molded product mounting portion and the mounting (locking) mechanism on the mounted body side, The material for molding the leg is not particularly limited. In general, the composition may be the same as or different from that of the main body molding material. In addition, the mounting leg portion may be entirely formed of one molding material, or a different molding material may be used for each portion (specifically, a portion viewed from the cross section).
For example, in consideration of the environment, a molding material mainly composed of an olefin-based thermoplastic polymer material is preferable as in the head. For example, when the main body of the head is molded from a molding material mainly composed of a relatively hard olefin-based thermoplastic elastomer material as described above, the mounting leg molding material has a hardness equivalent to or higher than that. However, it is preferable to employ a molding material mainly composed of a thermoplastic elastomer (for example, an olefin-based thermoplastic elastomer) from which a relatively hard molded body can be obtained. In this case, stability after attachment is good.
In addition to the main portion (stem portion) of the mounting leg portion, an engaging piece (lip) for locking to the mounted body is provided with a soft TPO (for example, a hard TPO) having a higher elastic force, as in the embodiments described later. It may be formed from a molding material mainly composed of TPO) whose segment is an olefin resin such as polypropylene and whose soft segment is EPDM.
The mounting leg part molding material may contain various auxiliary components similar to those of the main body part molding material. Moreover, the mounting leg part molding material can be prepared in a desired form by various conventionally known methods, like the body part molding material. For example, a mixture of an olefinic thermoplastic polymer material and an appropriate auxiliary component (filler or the like) in a predetermined ratio can be kneaded with a kneading extruder and extruded into a strand, and then pelletized.
Although not particularly limited, for example, in the case of a vehicle decorative molded product such as a roof molding, the hardness of the mounting leg molding material (that is, durometer hardness according to JIS K 7215) is the same as or slightly higher than that of the head main body. (For example, HDA 80-100) is preferable. For example, an olefinic thermoplastic polymer material and other components (such as a filler) may be blended and kneaded at an appropriate mass ratio so that a molded body having such hardness can be obtained by extrusion molding.

The long molded product of the present invention can be molded using the various molding materials described above. Typically, it can be produced by various conventionally known extrusion methods. For example, an appropriate body part molding material is melted to extrude the body part, an appropriate cover layer molding material is melted and the cover layer is extruded, and an appropriate mounting leg part molding material is melted to attach the mounting leg. Extrude the part. At this time, the cover layer has a thickness that allows elastic bending and / or twisting of the main body, and allows the inside of the surface side of the cover layer to be seen through from the outside, but the color of the surface of the main body through the cover layer. Preferably, it is formed to have a substantially constant thickness sufficient to prevent see-through. The main body and the cover layer are preferably extruded so that they are laminated integrally by heat fusion. For this purpose, the body part molding material and the cover layer molding material exhibit an approximate melting temperature, and the body part and the cover layer are integrated by coextrusion molding using one extrusion mold while using these materials. Extrusion molding is preferred. In this case, it is particularly preferable that the body portion and the cover layer have an approximate molding shrinkage rate in order to manufacture a molded product accurate to a desired size and shape. For example, the olefinic thermoplastic elastomer material and the random polypropylene resin material to be used may be determined so that an approximate melting temperature and molding shrinkage can be obtained. Moreover, it is preferable that the head and the mounting leg are also integrally extruded by coextrusion using a single extrusion mold.
Note that the core material can be embedded (inserted) without any particular limitation in the long molded product disclosed herein. For example, it is preferable to embed a metallic core material such as a circular wire shape or a flat plate shape in the head main body portion or the mounting leg portion from the viewpoint of mounting workability and dimensional shape stability after mounting.

The extrusion molding method itself for molding (manufacturing) the long molded product disclosed here may be the same as the conventional one, and no special operation is required to carry out the present invention.
For example, depending on the type (number) of molding materials to be used, prepare extruders (for example, a total of three extruders if there is one main body molding material, cover layer molding material, and mounting leg molding material). . Moreover, it connects with each extruder (a common single-screw extruder, a twin-screw extruder, etc.), and it is in the cross-sectional shape of the molten resin flow path through which the heat-melted resin flows, and the long molded product which is a manufacturing objective. An extrusion apparatus comprising an extrusion die having a corresponding opening-shaped orifice is prepared. Then, a predetermined molding material is put into each extruder, a molten molding material is supplied from each extruder to a die, and a main body molded body, a cover layer molded body, and an attachment with a predetermined cross-sectional shape from the orifice The leg molded body is extruded simultaneously (that is, coextrusion molding is performed). Thereby, the desired long molded article can be shape | molded (manufactured).

Alternatively, instead of coextrusion molding, an extrusion molding apparatus including a plurality of extrusion dies may be prepared and extrusion molding may be performed in stages for each part of the long molded product. For example, the head (the cover layer and the main body) is first extruded by a first extrusion die connected to the first extruder. Next, the extrusion forming body constituting the head is guided to the second extrusion die, and the molten mounting leg molding material is supplied from the second extruder connected to the second die to the second extrusion die. The mounting leg molded body, which is supplied to the die and molded so as to protrude from the back surface of the head, can be extruded together with the head molded body. By the same manufacturing method, the head cover layer and the main body may be separately extruded stepwise before the mounting leg portion is extruded.
Moreover, you may provide the sizing apparatus provided with the extrusion molded object flow path of predetermined | prescribed cross-sectional shape downstream from die | dye (orifice). By providing such a sizing device and cooling the molded body extruded from the orifice in the sizing device, it is possible to easily form a long molded product adjusted to an accurate cross-sectional shape.
These extrusion methods themselves do not particularly characterize the present invention and will not be described in further detail.

The shape and size of the head (cover layer and main body) and mounting leg of a long molded product manufactured by extrusion are optional by appropriately changing the extrusion die used (specifically, the shape of the orifice). Can be set to
Although not particularly limited, an extrusion die is formed so that the thickness of the cover layer to be molded is 10% or less of the maximum thickness portion in the cross section of the main body and is in the range of 0.05 to 0.4 mm. It is preferable to perform extrusion molding by setting the orifice shape and the like.
The long molded product including the cover layer and the main body portion having such a shape has a cover layer against elastic deformation (bending and / or twisting) of the main body portion while suitably maintaining the colorability and / or concealment of the cover layer. Excellent trackability. For this reason, it is preferable as a molded product (for example, an automobile roof molding) to be mounted on a curved body (for example, a vehicle). More preferably, the thickness of the cover layer is set in the range of 0.1 to 0.3 mm. For example, in a long molded product such as a roof molding, it is particularly preferable that the thickness of the cover layer is set in a range of 0.15 to 0.25 mm.

  Alternatively, by co-extrusion or stepwise extrusion, there is a portion exposed in the longitudinal direction without being covered by the cover layer at the end in the width direction of the main body (typically, the transverse direction to the longitudinal direction of the molded product). In addition, it is preferable that the cover layer is formed in a shape that keeps non-contact with the attached body while the exposed portion contacts the attached body when attached to a vehicle or other attached body. Thereby, it can prevent that the random polypropylene cover layer harder than a main-body part contacts a to-be-attached body. For this reason, it is necessary to prevent the generation of abnormal noise due to contact and to take into consideration the aesthetics of the mounted body (for example, the vehicle) (for example, it is necessary to protect the mounting part of the molded product so as not to be scratched or dented). It is preferable as a molded article (for example, an automobile roof molding).

  In addition, it is not essential because it differs depending on the application, but after extrusion molding, the main body and the cover layer are folded in the direction of the mounting leg while maintaining the laminated state of the main body and the cover layer. Is preferred. Thereby, there is no joining line to a terminal, and the same external appearance can be maintained, without adding another members, such as a cap. In addition, the number of parts can be reduced. For example, in the bending step, the longitudinal end portion of the molded product after extrusion is heated to a softening temperature or higher to be softened, and the softened end portion is mechanically bent, for example, using a press die. This can be done by applying press molding.

Hereinafter, a preferred embodiment of the long molded product of the present invention will be described with reference to the drawings. The present embodiment is an example of a roof molding that is mounted on a roof panel of an automobile. FIG. 1 is a perspective view schematically showing the appearance and mounting position of a roof molding 10 according to the present embodiment.
As shown in FIG. 1, the roof molding 10 according to the present embodiment is arranged in the vehicle front-rear direction along the boundary between a roof center panel 2 and a roof side panel 3 constituting a roof panel 1 of a general vehicle (automobile). This is a long molded product to be mounted in the formed roof groove 2a. As shown in the figure, the roof groove 2 a is curved in the vertical direction and / or the horizontal direction along the shape of the roof panel 1. Specifically, the roof groove 2a is formed substantially straight (straight) near the center of the roof in the longitudinal direction, while a portion adjacent to the rear pillar 5 at the rear of the roof is in the vertical direction (specifically, the vehicle It is slightly curved downward. Furthermore, the part adjacent to the front pillar 4 at the front part of the roof is curved in the vertical direction and the horizontal direction. Specifically, it is curved while twisting obliquely downward toward the outside of the vehicle.

As is apparent from the cross-sectional shape shown in FIG. 2, the long molded product according to this embodiment is a roof molding 10 having a general shape. That is, the roof molding 10 roughly includes a head 11 and mounting legs 15.
The head portion 11 includes a thick and long plate-like main body portion 13 wider than the lateral width of the roof groove 2a, and a thin cover layer 12 laminated and integrated on the surface of the main body portion 13. . As shown in FIG. 2, portions 13 a and 13 b that are not covered by the cover layer 12 and are exposed in the longitudinal direction are formed at both ends in the width direction on the surface of the main body 13. The average thickness of the cover layer 12 is about 0.2 mm. In general, in the case of a roof molding, if the thickness is more than 0.4 mm, the followability corresponding to the three-dimensional shape change of the roof groove 2a is not preferable. In addition, if the thickness is less than 0.05 mm, the surface color of the main body 13 may be seen through, which is not preferable. The average thickness is controlled to be 10% or less of the maximum thickness portion in the cross section of the main body 13. That is, the thickness of the maximum thickness portion in the cross section of the main body portion 13 (typically the central portion in the width direction of the main body portion, and the thickness becomes thinner as it gets closer to both ends in the width direction) exceeds 2 mm. In this embodiment, it is about 2.5 mm.

On the other hand, as shown in FIG. 2, the attachment leg portion 15 includes a trunk portion (leg body portion) 16 that protrudes substantially vertically from the vicinity of the center of the back surface of the head portion 11 (main body portion 13), and a lower end of the trunk portion 16. Overhang portions 17 and 18 projecting from the vicinity in both width directions are formed. Locking lips 19 and 20 that are pressed against the side wall surfaces in the roof groove 2a (that is, the surfaces of the panels 2 and 3 in the roof groove 2a) are integrally formed at the ends of the overhang portions 17 and 18, respectively. ing.
As shown in FIG. 2, a plate-shaped metal core material (typically a steel or stainless steel thin plate material) 21 is embedded in the longitudinal direction at substantially the center of the upper portion of the trunk portion 16 in the width direction. ing.

The cover layer 12 of the roof molding 10, the main body 13, the trunk 16 of the mounting leg and the overhangs 17, 18 and the locking lips 19, 20 are formed of molding materials having different compositions.
That is, the cover layer molding material is composed of 97 parts by mass of the above-described random polypropylene resin material having an MFR of 5 to 30 g / 10 minutes, 0.3 parts by mass of carbon black powder and 0.2 parts by mass of copper phthalocyanine blue as a colorant. (Total 0.5 parts by weight of colorants), 0.1 parts by weight of fine aluminum powder in the form of flakes (particle size 20-30 μm and the above aspect ratio 3-4) as a light reflective material, and dispersant A molding material obtained by kneading 0.6 parts by mass, 0.2 parts by mass of an antioxidant and 0.3 parts by mass of a UV absorber. By using such a colorant at the above blending ratio (blending amount), a deep blue cover layer 12 can be formed.
The molding material for the main body is composed of an olefinic thermoplastic elastomer material mainly composed of polypropylene and EPDM and a powdery solid filler such as wood powder, and a small amount of carbon black and a small amount of other components (dispersion). Molding agent, antioxidant, UV absorber, etc.). By blending carbon black, the weather resistance of the main body 13 can be improved.
In addition, the molding material for the trunk portion 16 and the overhang portions 17 and 18 of the mounting leg portion 15 is mainly composed of an olefin-based thermoplastic elastomer, and a small amount of other components (dispersant, antioxidant, UV absorber, etc.) are kneaded. Is a molding material.
Further, the molding material for the locking lips 19 and 20 of the mounting leg 15 is mainly composed of soft TPO (for example, polypropylene resin + EPDM) and contains a small amount of other components (dispersant, antioxidant, UV absorber, etc.). A molding material obtained by kneading.
Thus, by performing general extrusion molding using the above four types of molding materials, the linear roof molding 10 was molded (manufactured) over the entire configuration described above.

  Next, as shown in FIGS. 4 and 5, at one end portion in the longitudinal direction and as described above, the roof front portion (that is, the portion adjacent to the front pillar 4) having a larger curvature and twist than the other portion. In the portion 23 to be disposed, the lower portion of the mounting leg portion 15, specifically, all the overhang portions 17 and 18 including the locking lips 19 and 20 as shown in FIG. did. Further, the remaining trunk portion 16 was also removed at the longitudinal end portion 25. That is, in the forefront portion 25, as shown in FIG. 5, the mounting leg portion 15 does not exist and only the head portion 11 exists. Although not shown, all the projecting portions 17 and 18 and a part of the lower end of the trunk portion 16 are cut off at the other end portion in the longitudinal direction (that is, the portion adjacent to the rear pillar 5 at the rear portion of the roof). In FIG. 5, the mounting leg portion 15 was completely removed.

Thus, the main body 13 of the distal end portion 25 from which all the mounting leg portions 15 were removed was heated and softened. Then, as shown in FIGS. 4 and 5, the head 11 (the cover layer 12 and the main body 13) where the tip portion 25 remains is moved in the direction of the trunk 16 where a part of the lower end is cut off by using an appropriate press machine. Bending was performed to join the back surface of the main body 13 at the most advanced portion and the end surface of the trunk 16 from which a part of the lower end was excised. As a result, both end portions 25 in the longitudinal direction of the roof molding 10 have end surfaces formed by the bent cover layer 12, and a molding cross section that is not desirable in design is shielded.
Thus, in this roof molding 10, the decoration of the both ends of the longitudinal direction which is seamless and excellent in design nature can be performed, without using a cap member separately. Or you may use the cap of the separate member conventionally used. For example, a suitable cap member may be integrally formed at the end of the roof molding 10 in a separate process (for example, insert injection molding) from the extrusion molding of the roof molding 10.

  Next, the mounting state of the roof molding 10 having the above configuration in the roof groove 2a will be described. As shown in FIGS. 1 to 3, the mounting leg 15 is inserted into the roof groove 2 a while appropriately bending and / or twisting the roof molding 10 body in accordance with the three-dimensional shape change of the roof groove 2 a. At this time, as described above, there are main body exposed portions 13a and 13b in which the cover layer 12 made of a relatively hard random polypropylene resin is not formed in the terminal portion in the width direction of the main body, as shown in FIG. The exposed portions 13a and 13b are in contact with the roof panel 1 (center panel 2 and side panel 3), but the cover layer 12 is not in contact. Thereby, it is possible to prevent the roof panel 1 from being damaged when the roof molding 10 is mounted.

The roof molding 10 maintains a substantially straight shape in the central portion 10b in the longitudinal direction even after being mounted in the roof groove 2a. On the other hand, the front end portion 10c and the rear end portion 10a in the longitudinal direction, that is, the portions to be attached to the front portion of the roof groove 2a (the portion close to the front pillar 4) and the rear portion of the roof groove 2a (ie, the portion close to the rear pillar 5). 10c and 10a are bent downward and / or in the left-right direction along the roof groove 2a. In particular, the portion 10c attached to the front portion of the roof groove 2a (the portion close to the front pillar 4) is attached while being elastically deformed so that the shaft is twisted to the outside of the vehicle as it is bent downward and in the left-right direction.
The core member 21 embedded in the trunk portion 16 of the mounting leg portion 15 is embedded in a state where the wide surface is not parallel to the width direction of the head portion 11. In other words, the core material 21 is embedded so that bending and / or twisting can be easily induced in a predetermined direction or angle corresponding to the three-dimensional shape change of the roof groove 2a. As a result, it is possible to easily perform a mounting operation involving bending and twisting along the roof groove 2a of the entire roof molding 10.

As shown in FIG. 2, in the roof molding 10 attached to the roof groove 2a with elastic deformation, a part of the locking lips 19, 20 inserted into the groove 2a is formed on the side wall (panel 23) in the roof groove 2a. It is locked to the roof groove 2a by being crimped to the surface).
In addition, in the portion 23 where a part of the mounting leg portion 15 including the locking lips 19 and 20 described above is cut off, a mounting clip (not shown) is fixed to the back surface side of the molding like a conventional general roof molding. Then, by engaging the clip with an engagement tool (T stud or the like) (not shown) provided in the roof groove 2a so as to correspond to the clip, the roof molding 10 is locked to the roof groove 2a. Note that the mounting clip may be fixed to the roof groove.

  3 and 4 schematically show the degree of such elastic deformation. That is, when viewed from the molding portion 10b attached to the center portion of the roof groove 2a, the molding portion 10c attached to the front portion of the roof groove 2a (the portion close to the front pillar 4) is below the scale X shown in FIG. Is bent in the direction and is bent in the left-right (lateral) direction by the scale Y, and the shaft is twisted by an angle θ. Due to such complex elastic deformation, as shown in FIG. 4, the axis Q of the roof molding 10 after extrusion is shifted to the position indicated by Q 'in the drawing after the roof groove 2a is mounted.

In the roof molding 10 according to the present embodiment having the above-described configuration, even when the main body 13 is subjected to elastic deformation as shown in FIGS. For this reason, the cover layer 12 is free from defects such as wrinkles, cracks, cracks, and chips.
In addition, as a result of the cover layer 12 being formed from a molding material obtained by kneading a predetermined colorant (and preferably a light-reflective material) in the above blending amount in a random polypropylene resin material having essentially high transparency, the cover layer 12 exhibits translucency when viewed from the outside. In other words, the surface layer portion of the cover layer 12 can be seen through, but the surface of the main body portion 13 is not visually recognized, and a decorative effect of a color tone having a depth, that is, a depth is provided in the cover layer (that is, the design surface of the roof molding 10). Can be realized. Moreover, since the amount of the expensive colorant is relatively small, an increase in manufacturing cost can be suppressed with respect to an improvement in the decoration effect.
As described above, the roof molding 10 according to the present embodiment can achieve both good followability with respect to bending and twisting in the mounted state and high decorativeness.

Although specific examples of the present invention have been described in detail above, they are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, the present invention is not limited to the roof molding illustrated as an example, but can be applied to a pillar molding that is attached along the front pillar or rear pillar of the vehicle body, or a molding that is integrally connected to the pillar molding from the roof molding. Further, the present invention can be applied to other vehicle malls such as door moldings, window moldings, side moldings, locker protectors, and bumper moldings. Furthermore, the present invention can be preferably applied not only to a long decorative molded product for vehicles but also to various decorative decorative products for buildings.

It is a fragmentary perspective view showing typically a vehicle roof in the state where a roof molding concerning one example of the present invention was installed. It is the II-II sectional view taken on the line in FIG. It is the III-III sectional view taken on the line in FIG. It is a partially broken perspective view which shows typically the terminal part of the longitudinal direction of the roof molding concerning one example. It is the VV sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roof panel 2a Roof groove 10 Roof molding 11 Head 12 Cover layer 13 Main-body part 15 Mounting leg part 16 Trunk parts 19 and 20 Locking lip

Claims (15)

A head composed of a main body formed in a predetermined cross-sectional shape, a cover layer laminated and integrated on the surface of the main body thinner than the main body, and the head is attached to a predetermined attached body A long decorative molded product having a mounting leg formed so as to protrude from the back surface of the head,
The main body is molded from an elastically deformable olefin-based thermoplastic elastomer material in which a filler is kneaded,
The cover layer is formed of a random polypropylene resin material that is harder than the material for molding the main body and is kneaded with a colorant, and has a thickness that can allow elastic bending and / or twisting of the main body. In addition, the inside of the surface side of the cover layer can be seen through from the outside, but is molded to a substantially constant thickness sufficient to prevent the color of the surface of the main body portion from being seen through the cover layer,
The cover layer is stretched when the decorative molded product is attached to a predetermined attachment body while the longitudinal axis of the main body is bent and / or the axis is twisted so that the cover layer side is convex. A long decorative molded product that can be integrally followed by twisting and / or bending of the main body.   The molded product according to claim 1, wherein the main body is colored black by kneading 0.5 to 10 mass% of carbon black.   The molded article according to claim 1 or 2, wherein the thickness of the cover layer is 10% or less of a maximum thickness portion in a cross section of the main body and is set in a range of 0.05 to 0.4 mm. .   The thickness of the said cover layer is a molded article of Claim 3 set to the range of 0.1-0.3 mm. In the width direction terminal of the main body, it has a portion exposed in the longitudinal direction without being covered by the cover layer,
The mounting portion is configured to keep the exposed portion in the longitudinal direction of the main body portion in contact with the mounted body while the cover layer is not in contact with the mounted body. The molded article as described in any one of 1-4.   The molded product according to any one of claims 1 to 5, wherein the main body part and the cover layer are bent in the direction of the attachment leg part while maintaining a laminated state in the longitudinal direction terminal.   The molded product according to any one of claims 1 to 6, wherein the main body portion and the cover layer are co-extruded, and both have substantially the same molding shrinkage rate.   The molded article according to any one of claims 1 to 7, wherein the cover layer is kneaded with a fine powdery light reflective material.   The molded product according to claim 8, wherein the fine powdery light reflective material is at least one selected from the group consisting of mica, aluminum, and nickel.   The molded article according to claim 8 or 9, wherein an average of aspect ratios defined by outer dimensions / thicknesses in the fine powdery light reflective material is less than 5.   The molded product according to any one of claims 1 to 10, wherein the molded product is formed as a roof molding to be mounted in a roof groove of a vehicle. A head composed of a main body formed in a predetermined cross-sectional shape, a cover layer laminated and integrated on the surface of the main body thinner than the main body, and the head is attached to a predetermined attached body A method for producing a long decorative molded product having a mounting leg portion that is shaped to protrude from the back surface of the head for the following steps:
Melting the elastically deformable olefinic thermoplastic elastomer material kneaded with the filler and extruding the main body;
Extruding the cover layer by melting a random polypropylene resin material having a higher hardness than the material for molding the main body and kneading a colorant, wherein the cover layer is formed by elastic bending of the main body and And / or a thickness that allows torsion and is substantially constant enough to allow the inside of the surface of the cover layer to be seen through from the outside, but to prevent the color of the surface of the body portion from being seen through the cover layer. Molded into a thickness; and integrally laminating the main body and the cover layer by heat fusion;
Including
The cover layer is stretched when the decorative molded product is attached to a predetermined attachment body while the longitudinal axis of the main body is bent and / or the axis is twisted so that the cover layer side is convex. A method of manufacturing a long decorative molded product that can be integrally followed by twisting and / or bending of the main body.   The method according to claim 12, wherein the random polypropylene resin material is a material having a melt mass flow rate (MFR) obtained by a method defined in JIS K 7210 larger than a material for molding the main body.   The method according to claim 13, wherein the melt mass flow rate (MFR) is 5 g / 10 min or more. The material for molding the main body and the material for molding the cover layer exhibit the same or substantially the same melting temperature,
The method according to any one of claims 12 to 14, wherein the body portion and the cover layer are integrally extruded by using these materials and co-extrusion using one extrusion mold.

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