JP4734764B2 - Automotive mall and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile molding and a method for manufacturing the same.
[0002]
[Prior art]
A modified olefin-based or modified styrene-based color resin is extruded so as to cover a metal core material having a substantially U-shaped cross section and a locking portion formed on both leg portions, and a soft synthetic resin lip is formed on the color resin. The automobile color molding provided is described in Japanese Patent Laid-Open No. 2000-313049.
[0003]
Also, an acrylonitrile / acrylic rubber having a substantially L-shaped cross section on the back of the molding surface made of acrylonitrile / acrylic rubber / styrene resin, acrylonitrile / EPDM / styrene resin or acrylonitrile / styrene / butadiene resin, etc.・ Automotive roof molding that integrally molds the molding body consisting of styrene resin or acrylonitrile, EPDM, and styrene resin, and has a lip made of flexible resin such as soft PVC, styrene, ethylene, butylene, and styrene resin. This is described in JP-A-9-2170.
[0004]
[Problems to be solved by the invention]
In automobile moldings formed by coating a thermoplastic resin on a metal core, there are problems in terms of weight reduction, recyclability, and cost, and roll forming to achieve a shape that conforms to the body shape. Or press molding had to be performed, and the manufacturing cost was high.
[0005]
Also, in moldings where the molding surface and molding main part are molded with acrylonitrile, acrylic rubber, styrene resin, acrylonitrile, EPDM, styrene resin, and the lip is molded with soft polyvinyl chloride resin, styrene, ethylene, butylene, styrene resin, etc. Had problems with environment and recyclability.
[0006]
Furthermore, the conventional molding having an outer surface formed of an amorphous resin has a problem that it is easily damaged by being deteriorated by adhering gasoline or acidic or alkaline car wash liquid.
[0007]
The present invention has been made in order to eliminate such conventional problems, and the object thereof is to integrally extrude the core material, the design portion, the gradual change portion, and the lip portion with an olefin resin.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the structural feature of the invention described in claim 1 is that a cross-section is formed in a substantially C-shaped cross section, and a locking portion that is locked to the body side at the tip of both leg portions. A formed hard polypropylene core material, a colored high crystal polypropylene design part extruded and integrally formed on the outer surface of the surface part connecting the both side legs of the core material, and a portion separated from the body side SHORE-D hardness 40-60 °, flexural modulus 650-850 MPa, which is extruded and molded integrally on the tip of one leg, and extends toward the body at the spaced apart position. olefin-based elastomer or a polypropylene gradually changing portion and the other leg of the outer surface and on the gradually changing portion of the distal end portion olefin respective extruded integrally molded JIS-a hardness of 60-80 ° on the outer surface of the An elastomeric lip , It is to be prepared.
[0011]
The structural feature of the invention according to claim 2 is the hard polypropylene in which the core material contains 10 to 50 weight percent of talc or calcium carbonate or a mixture of talc and calcium carbonate in the automobile molding according to claim 1. in is formed, it is that the design part is formed by coloring high crystalline polypropylene containing a weather resistant component.
[0012]
The structural feature of the invention according to claim 3 is the automobile molding according to claim 1 or 2 , wherein the gradually changing portion is a portion where the one leg portion of the core member is separated from the window glass. The olefin elastomer lip portion, which is extended toward the body side in accordance with the separation distance and is extruded and integrally formed on the outer surface of the tip end portion of the gradually changing portion, approaches the window glass. It is to touch .
[0014]
The structural feature of the invention according to claim 4 is that the core is made of a hard polypropylene having a substantially C-shaped cross section and a locking portion that is locked to the body side at the tip of both side legs, Molded on the outer surface of the surface portion that connects the both side legs of the core material, the design portion made of colored high crystal polypropylene, and molded on the tip of one leg where there is a space away from the body side A gradually changing portion made of an olefin-based elastomer or polypropylene having a SHORE-D hardness of 40 to 60 ° and a flexural modulus of 650 to 850 MPa that extends in accordance with the distance of separation toward the body side at the separated portion, and the other extruded integral with the olefinic elastomeric lip portion of the JIS-a hardness of 60-80 °, which are respectively formed on the distal end outer surface of the outer surface of the leg portion and the gradually changing portion, the one extrusion line To form a rod-shaped molded member, The rod-shaped molded member is cut into a predetermined length, heated and then bent into a bent molded body having a shape along the body shape by a bender, and the bent molded body is annealed to obtain a crystallinity of the hard polypropylene of the core material of 40. Control to ~ 55 percent.
[0018]
[Operation and effect of the invention]
In the above-described construction the invention according to claim 1 as cross-section a substantially C-shaped without a both side legs of the tip body side locked by the locking portion is rigid polypropylene core material formed The design part made of colored high crystal polypropylene is extruded and integrally molded on the surface part of the core material, and this separation toward the body side is provided on the tip part of one leg part where the part is separated from the body side. The gradual change part made of olefin-based elastomer or polypropylene with SHORE-D hardness of 40 to 60 ° and bending elastic modulus of 650 to 850 MPa extending according to the distance to be extruded is integrally formed, and on the outer surface of the other leg part and gradual change part olefinic elastomeric lip portion of the tip JIS-a hardness of 60-80 ° on the outer surface and each extruded integrally molded, so the entire mall was integrally molded body of an olefinic resin, recyclability, environmental Excellent in sex It is lighter and less costly than a molding using a metal core material, and the outer design part is molded with colored high crystalline polypropylene so that it is not easily scratched and is not deteriorated by a car wash solution or the like, and an olefin elastomer. Or it can fit smoothly also to the site | part from which the body shape on both sides of a molding differs by the gradually changing part formed with the polypropylene.
[0019]
In the invention according to claim 2 configured as described above, the core is formed of hard polypropylene containing 10 to 50 weight percent of talc, calcium carbonate, or a mixture of talc and calcium carbonate, and the design portion is weather resistant. In addition to the effect of the invention of claim 1 , since it is formed from colored high crystalline polypropylene containing components, a core material with sufficient rigidity, a design part with weather resistance, and a gradual change with necessary flexibility Part and lip part.
[0020]
In the invention according to Claim 3 configured as described above, in the automotive molding according to Claim 1 or Claim 2 , in the front window portion and the rear window portion, the window glass is formed in the both side legs of the core material. One leg on the side is separated from the window glass, but a gradually changing portion made of olefin-based elastomer or polypropylene is extruded and integrally formed on the tip of the one leg according to the distance to be separated. The lip portion made of an olefin-based elastomer extruded and integrally formed on the outer surface of the distal end portion of the deformed portion with good fusion can approach the window glass and come into contact therewith.
[0022]
In the invention according to claim 4 configured as described above, a hard polypropylene core material having a substantially C-shaped cross section and a locking portion that is locked to the body side at the tip of both side leg portions. And a design portion made of colored high-crystal polypropylene molded on the outer surface of the surface portion of the core material, and this spacing toward the body side on the tip portion of one leg portion where there is a portion spaced from the body side The gradual change part made of olefin-based elastomer or polypropylene having a SHORE-D hardness of 40 to 60 ° and a flexural modulus of 650 to 850 MPa, and the other leg part on the outer surface and the tip of the gradual change part extend according to the distance an olefin-based elastomeric lip portion of the JIS-a hardness of 60-80 °, which are respectively formed in one extrusion line extruding integrally molding the rod shaped molded member onto the part outer surface, a predetermined and rod-shaped molded member After cutting to length and heating Since bending was performed into a bent molded body having a shape along the body shape by a bender and the bent molded body was annealed to control the crystallinity of the hard polypropylene of the core material to 40 to 55 percent, A gradual change part that can smoothly fit to different parts of the body shape can be efficiently extruded and integrally molded into the core material, and the core material deforms and separates from the body outline under the high temperature environment of the automobile In addition, an automobile molding made entirely of olefin resin can be manufactured at a low cost in a favorable working environment.
[0024]
Embodiment
Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an automobile molding 10 according to the present invention is attached to, for example, a joint 14 of a roof panel 12 and a side panel 13 of a body 11 of an automobile, and includes a roof portion 15 and a front window portion 16. And a rear window portion 17.
[0025]
As shown in FIGS. 2 to 7, the automobile molding 10 is formed on the basis of a hard polypropylene core material 20 extruded to have a substantially C-shaped cross section. As the hard polypropylene forming the core material 20, talc, calcium carbonate, or a mixture of talc and calcium carbonate, etc., containing 10 to 50 weight percent, for example, polypropylene added with approximately 40 weight percent talc is used. Locking portions that are locked to polypropylene fixtures 23 and 31 that are fixed to the front end portion of the leg portion 22 projecting from both sides of the surface portion 21 of the core member 20 at an appropriate interval on the body 11 side. 24 is formed inside each. As shown in FIG. 3, the fixture 23 that fixes the roof portion 15 of the molding 10 to the roof portion of the body 11 is located above the base 25 and the base 25 fixed to the joint portion 14 between the roof panel 12 and the side panel 13. A pair of projecting portions 27 are provided, each of which is provided with a collar portion 26 that protrudes from the front end and engages with each locking portion 24 at the tip. As shown in FIG. 7, the fixture 31 that fixes the front window portion 16 and the rear window portion 17 of the molding 10 to the window side portion of the body 11 extends upward from the base portion 28 and the base portion 28 fixed to the side panel 13. A protruding portion 30 is provided which is provided with a collar portion 29 that protrudes and engages with the locking portion 24 on the side of the window glass. Reference numeral 32 denotes a wire for preventing the molding 10 from shrinking due to heat or the like, and is integrally embedded in the center portion of each leg portion 22 in the longitudinal direction when the core material 20 is extruded.
[0026]
Design part 35 made of colored high crystal polypropylene is extruded and integrally formed on the outer surface of the surface part 21 connecting the both side leg parts 22 of the core material 20. Since highly crystalline polypropylene is hard, scratch resistance is improved. It is advisable to add not only colorants such as pigments and aluminum foil but also weathering components such as heat stabilizers, UV absorbers, light stabilizers (UVA, HALS, etc.) to the high crystalline polypropylene.
[0027]
In the front window portion 16 and the rear window portion 17, as shown in FIGS. 2 and 7, the leg portions 22 on the side of the window glasses 36 and 37 and the window glass on the body side in the both side leg portions 22 of the core member 20. 36 and 37 are spaced apart. 38 is a gradually changing portion made of olefin-based elastomer or polypropylene, which is extruded and integrally formed on the tip end portion of the leg portion 22 on the body side, and an extension portion 39 at a place where one leg portion 22 is separated from the window glasses 36 and 37. , 40 are extended toward the body side. The gradual change part 38 is good to form with the olefin type elastomer or polypropylene of SHORE-D hardness 40-60 degrees and a bending elastic modulus 650-850 MPa.
[0028]
On the outer surface of the other leg portion 22 on the side panel 13 side of the core material 20, a lip portion 41 made of olefin elastomer is extruded and integrally formed, and is in contact with the side panel 13. A lip portion 42 made of an olefin elastomer is also extruded and integrally formed on the outer surface of the gradually changing portion 38. In the front window portion 16 and the rear window portion 17, the lip portion 42 is formed on the extension portions 39 and 40 of the gradual change portion 38, and comes into close contact with the window glasses 36 and 37. The lip portions 41 and 42 may be formed of an olefin-based elastomer having a JIS-A hardness of 60 to 80 ° which is excellent in fusion with the core material 20 and the gradually changing portion 38.
[0029]
In FIG. 1, 43 is a terminal piece injection-molded at both ends of the molding 20 and is formed of an olefin-based elastomer or polypropylene having a JIS-A hardness of 90 to 100 °.
[0030]
Next, a method for manufacturing the automobile mall 10 will be described. In FIG. 8, reference numeral 50 denotes one extrusion molding line, which is a hard polypropylene extruder 51 for the core material 20, a colored high crystal polypropylene extruder 52 for the design portion 35, and an olefin elastomer or polypropylene for the gradual change portion 38. An extruder 53 and an olefin elastomer extruder 54 for the lip portions 41 and 42 are provided. The resin extruded from the extruders 51 to 54 is supplied to each extrusion die having the cross-sectional shape of the core material 20, the design portion 35, the gradual change portion 38, and the lip portions 41 and 42 of the extrusion die device 55. Is a substantially polypropylene core material 20 made of hard polypropylene, and a design portion 35 made of colored high crystalline polypropylene is extruded and integrally molded on the outer surface of the surface portion 21 of the core material 20. A gradual change portion 38 made of olefin elastomer or polypropylene is extruded and integrally formed on the tip of the lip portion 41, and a lip portion 41 made of olefin elastomer is formed on the outer surface of the other leg portion 22 and on the outer surface of the gradual change portion 38. , 42 are extruded and integrally molded to form a rod-shaped molded member 57.
[0031]
In this case, as shown in FIG. 7, the core material 20 has a side panel side leg portion 22 which is short in the rear window portion 17, and therefore the extrusion mold for the core material 20 is an extrusion of the rod-shaped molding member 57. The nozzle opening shape is changed so that the leg 22 on the side panel side is shortened in the rear window portion 17 in relation to the amount. Also, the extrusion mold for the gradual change portion 38 has a variable nozzle opening shape, and the rod-shaped forming member 57 is extruded by the front window portion 16 and the rear window portion 17 in which one leg portion 22 is separated from the body side. Extending portions 39 and 40 that expand in relation to the amount and extend toward the body side in accordance with the separation distance are formed in the gradually changing portion 38. In order to extrude and integrally form the lip portion 42 on the outer surface of the tip portion of the gradual change portion 38, the extrusion mold for the lip portion 42 is related to the amount of extrusion of the rod-shaped forming member 57 and the front window portion 16 and the rear window portion. 17, the extension portions 39 and 40 are moved so as to face the tip portions. Reference numeral 56 denotes a wire supply device which supplies the wire 32 to the extrusion mold for the core material 20 in order to extrude the core material 20 in a state where the wires 32 are embedded in the center portions of the side legs 22 in the longitudinal direction. .
[0032]
A continuous film 61 wound around a reel 60 is provided above the extrusion die for the design portion 35. The film 61 is made of a heat-resistant polyethylene terephthalate film that is not melted at the melting temperature of the olefin resin. The extrusion mold for the design portion 35 is formed with a slit that opens from above to the upper surface of the nozzle, and the film 61 led to the nozzle through the slit from the reel 60 is pressure-bonded to the upper surface of the extruded design portion 35. .
[0033]
The rod-shaped molding member 57 of the molding 10 which is extruded by the extrusion molding line 50 and the film 61 is pressure-bonded is stabilized to a predetermined shape by a sizing device 58 and then passed through a cooling water tank 59 containing cooling water to have a predetermined shape. It is cooled and solidified. After the rod-shaped forming member 57 passes through the cooling water tank 59, the film 61 is wound around the reel 62 and peeled off from the design portion 35. A protective tape 64 wound around a reel 63 is pressed against the design portion 35 by a roller 65 and attached to the rod-shaped forming member 57 from which the film 61 has been peeled from the design portion 35. Reference numeral 65 denotes a drawing machine which pulls out the rod-shaped forming member 57 extruded by the extrusion forming line 50. The rod-shaped molding member 57 to which the protective tape 64 is attached is pulled out by a drawing machine 65 and then cut into a predetermined length by a cutting machine 66 at a predetermined location, whereby a molding material 67 for one molding 10 is formed.
[0034]
Next, the molding material 67 is heated to a temperature that softens to the extent that bending by the bender is possible (step 70), and as shown in FIGS. It is bent into a dimension (step 71). The bent molded body 68 that has been three-dimensionally bent is annealed in order to maintain its shape under the high temperature in which the automobile is used (step 72). In the annealing, the molding material 67 bent in three dimensions is heated at a crystallization temperature of 130 to 155 ° C. lower than the softening temperature for 0.2 to 1 hour to crystallize polypropylene containing talc or the like of the core material 20. Control the degree to 40-55 percent. As a result, the core material is not deformed and the molding 10 does not separate from the outer shape of the body. An end piece 69 of olefin elastomer or polypropylene is injection-molded on both ends of the annealed bent molded body 68 (step 73), and the automobile molding 10 is completed.
[0035]
In the above embodiment, the front window portion 16 and the rear window portion 17 are formed on both sides of the roof portion 15, but the front window portion 16 and the rear window portion 17 are removed, and only the roof portion without the gradually changing portion is used for the automobile. Malls may be formed.
[Brief description of the drawings]
FIG. 1 is a plan view of an automobile equipped with an automobile mall according to the present invention.
2 is a cross-sectional view taken along the line 2-2 in FIG.
3 is a cross-sectional view taken along the line 3-3 in FIG.
4 is a cross-sectional view taken along line 4-4 of FIG.
5 is a cross-sectional view taken along the line 5-5 in FIG.
6 is a cross-sectional view taken along line 6-6 in FIG.
7 is a cross-sectional view taken along line 7-7 in FIG.
FIG. 8 is a diagram showing a process of extruding a rod-shaped molding material of an automobile molding.
FIG. 9 is a diagram showing a manufacturing process for completing a rod-shaped molding material in an automobile molding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Automotive mall, 11 ... Body, 12 ... Roof panel, 13 ... Side panel, 14 ... Joint part, 15 ... Roof part, 16 ... Front window part, 17 ... Rear window part, 20 ... Core material, 21 ... Surface part, 22 ... Leg part, 24 ... Locking part, 23, 31 ... Fixing tool, 35 ... Design part, 36, 37 ... Window glass, 38 ... Gradual change part, 39, 40 ... Extension part, 41, 42 ... Lip part, 43 ... Terminal piece part, 50 ... Extrusion line, 51 to 54: Extruder, 55 ... Extrusion mold apparatus, 57 ... Bar-shaped molding member, 66 ... Cutting machine, 67 ... Bar-shaped molding material, 70 ... Heating process, 71 ... bending process, 72 ... annealing process, 73 ... injection molding process.

Claims (4)

A core made of hard polypropylene having a cross-section extruded into a substantially C shape and formed with a locking portion that is locked to the body side at the end of both leg portions;
A design portion made of colored high crystal polypropylene extruded and integrally molded on the outer surface of the surface portion connecting the both side legs of the core material;
SHORE-D hardness of 40 to 60 °, which is extruded and integrally formed on the tip of one leg portion where there is a portion separated from the body side, and extends toward the body side at the separated portion . A gradual change part made of an olefin elastomer or polypropylene having a flexural modulus of 650 to 850 MPa ,
And the other on the outer surface of the leg portion and the gradual change of the tip portion olefin elastomeric lip on the outer surface respectively extruded integrally molded JIS-A hardness of 60-80 °,
An automobile mall characterized by comprising: 2. The automobile molding according to claim 1, wherein the core material is formed of hard polypropylene containing 10 to 50 weight percent of talc or calcium carbonate or a mixture of talc and calcium carbonate, and the design portion contains a weathering component. An automotive molding characterized in that it is made of colored high crystalline polypropylene. 3. The automobile molding according to claim 1 , wherein the gradual change portion is in accordance with a distance of the core member toward the body side where the one leg portion of the core member is separated from the window glass. An automobile molding, characterized in that the olefin elastomer lip portion that is extended and extruded and integrally formed on the outer surface of the tip end portion of the gradually changing portion comes close to and comes into contact with the window glass . A core made of hard polypropylene having a substantially C-shaped cross section and formed with a locking portion that is locked to the body side at the tip of both leg portions;
A design portion made of colored high crystalline polypropylene molded on the outer surface of the surface portion connecting the both side legs of the core material;
SHORE-D hardness of 40-60 °, which is molded on the tip of one leg where there is a part separated from the body side and extends toward the body side at the separated part, and bent A gradual change part made of an olefin elastomer or polypropylene having an elastic modulus of 650 to 850 MPa ;
Integral with the other on the outer surface of the leg portion and the gradual change of the tip portion olefin elastomeric lip portion of the JIS-A hardness of 60-80 °, which are respectively formed on the outer surface, with one of the extrusion line Extruded to form a rod-shaped molded member,
The rod-shaped molded member is cut into a predetermined length, heated and then bent into a bent molded body having a shape along the body shape by a bender, and the bent molded body is annealed to increase the crystallinity of the hard polypropylene as the core material. A method for manufacturing a molding for an automobile, characterized by controlling to 40 to 55 percent.

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