JP2014117931A - Method for producing interior component, and interior component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an interior component capable of improving the appearance of a fine line pattern while maintaining joining strength between thread and a surface skin material in the fine line pattern, and to provide the interior component.SOLUTION: In a method for producing an interior component 1 in which a fine line pattern is formed on the surface, the fine line pattern is formed by joining pseudo thread 2 with a twisting pattern obtained by spirally forming a plurality of projecting parts 2b to a surface skin material 3 of the interior component 1.

Description

  The present invention relates to a method for manufacturing an interior part and an interior part. In particular, the present invention relates to a method for manufacturing an interior part in which a thread pattern is formed and the interior part.

  For example, in an interior part of an automobile, the surface of an instrument panel or console box covered with a soft skin material is subjected to a texture pattern and a thread pattern (for example, a stitch decoration part) to improve the design. The device has been devised to improve the appearance and bring a sense of luxury and softness.

In general, as shown in FIGS. 15 (a) to 15 (g), an interior part in which both a texture pattern and a thread pattern (stitch decoration portion) are formed is a base material forming process, a skin forming process, a stitch decorating process, And it is manufactured through the substrate bonding step.
That is, as shown in FIGS. 15A and 15B, a molten resin is injected into the injection mold 112 from the injection molding machine 111 and injection molding is performed to form the base material 113 shaped into a predetermined shape. (Base material forming step). 15C and 15D, after the skin material 114 is heated by the heating device 115, the skin material 114 is shaped into a shape corresponding to the base material 113 by the vacuum forming die 116. The embossed pattern is transferred to the surface of the skin material 114 (skin molding step). Then, as shown in FIG.15 (e), after cut | disconnecting the outer end of the skin material 114, a thread | yarn is sewn with the sewing machine 117 and a stitch decoration part is formed in the skin material 114 (stitch decoration process). Finally, as shown in FIG. 15 (f), the base material 113 is set on the male die of the press-bonding die 118, and the adhesive is applied to the surface of the base material by the coating machine 119, as shown in FIG. 15 (g). As described above, the skin material 114 adsorbed on the female die of the press-bonding die 118 is pressed against the male base material 113 to bond the skin material 114 and the base material 113 (base material bonding step).

As described above, in order to manufacture an interior part having a texture pattern and a stitch pattern (for example, a stitch decoration portion), a molded product of the skin material is machined and bonded to the base material. For this reason, the skin molding process and the base material bonding process cannot be performed in the same process. For this reason, the number of molds and the number of processes are greatly increased as compared with the interior part having only the texture pattern. As a result, there is a problem that the production cost is greatly increased.
Accordingly, the present inventors have intensively studied a manufacturing method for applying a thread pattern other than sewing on an interior part having a thread pattern.

For example, as a manufacturing method for forming a stitch pattern (stitch decoration portion) other than sewing, a thread is placed on the surface of a base material (including a skin material), and one electrode in contact with the back surface of the base material and the thread Using a high-frequency welding apparatus provided with the other electrode formed with a protruding portion that presses, at least one of the base material and the thread is partially melted, and the thread is stitched into the stitch pattern with respect to the base material. Japanese Patent Application Laid-Open No. 2004-133867 discloses a manufacturing method in which fixing and integration are performed at a corresponding interval.
In addition, an elongated member mounting groove with a thread pattern formed on the inner surface is provided at a predetermined position on the mold surface of the powder slush mold, and a thread-shaped plastic member of the required color is mounted in the member mounting groove, and then thermoplastic in the mold. Plastic powder is injected, and a molten plastic film is formed on the mold surface by a powder slush molding method, and a thread pattern on the inner surface of the groove is formed on the surface of the thread-shaped plastic member, and the molten plastic film and the thread-shaped plastic member are fused together. A manufacturing method is disclosed in Patent Document 2.

JP-A 63-199640 JP-A-10-249868

However, the techniques of Patent Documents 1 and 2 have the following problems.
That is, the technique of Patent Document 1 uses a high-frequency welding apparatus to partially melt at least one of a base material and a thread, and fixes the thread to the base material with an interval corresponding to a stitch pattern stitch. Since it is a method of integrating the fibers, if a normal twisted yarn formed by twisting thin fibers is used, the fine fibers may be partially melted or the yarn may be deformed when the yarn is melted. Therefore, there is a problem that the bonding strength between the yarn and the skin material in the stitch pattern is likely to decrease.
In addition, the technique of Patent Document 2 provides an elongated member mounting groove having a thread pattern formed on the inner surface at a predetermined position on the mold surface of the powder slush mold, and a thread-shaped plastic member of a desired color is mounted in the member mounting groove. In this method, a melt plastic film is formed on the mold surface by the powder slush molding method, and a thread pattern on the inner surface of the groove is formed on the surface of the thread plastic member. Therefore, there are places where the thread pattern is not sufficiently transferred to the surface of the thread plastic member. There was a risk of it occurring. Therefore, there is a problem that it is difficult to obtain an appearance like a genuine twisted yarn in the formed yarn pattern.

  The present invention has been made in order to solve the above problems, and a method for manufacturing an interior part capable of improving the appearance of the thread pattern while maintaining the bonding strength between the thread and the skin material in the thread pattern, and The purpose is to provide interior parts.

In order to solve the above-described problems, the interior component manufacturing method and interior component according to the present invention have the following configuration.
(1) A method for manufacturing an interior part that forms a thread pattern on the surface,
The stitch pattern is formed by joining a pseudo yarn having a twist pattern in which a plurality of convex portions are formed in a spiral shape to a skin material of the interior part.

In the present invention, the stitch pattern is formed by joining a pseudo yarn having a twist pattern in which a plurality of convex portions are formed in a spiral shape to the skin material of the interior part, and is usually formed by twisting thin fibers. Unlike the twisted yarn, the fusing and deformation of the pseudo yarn are difficult to occur, and the necessary bonding strength between the pseudo yarn and the skin material can be ensured. In addition, the pseudo-yarn itself has a twisted pattern with a plurality of convex portions formed in a spiral shape, so that even when the yarn is joined to the skin material, the twisted pattern remains on the entire yarn, improving the appearance of the threaded pattern Can be made.
In addition, since the multiple convex parts of the pseudo yarn constitute a star shape in which substantially the same triangular shape is gathered, it can be approximated to the twist pattern of a normal twist thread, further improving the appearance of the thread pattern Can be made.

(2) In the method for manufacturing an interior part described in (1),
The spiral shape of the pseudo yarn is formed by cooling while rotating the die of the injection port when the injection molded yarn is extruded from an injection molding machine.

  In the present invention, the spiral shape of the pseudo yarn is formed by cooling while rotating the base of the injection port when the injection molded yarn is extruded from the injection molding machine. It can be formed in cross section. Further, by changing the speed of rotating the mouthpiece of the injection port and the shape of the opening cross section, a necessary twist pattern in the pseudo yarn can be easily formed. In addition, while considering the appearance of the stitch pattern, it is possible to optimize the molten state of the pseudo yarn and the skin material and increase the bonding strength.

(3) In the method for manufacturing an interior part described in (1) or (2),
The pseudo yarn is bonded to the skin material in a skin molding simultaneous base material bonding step in which the skin material of the interior part and the base material are bonded together.

  In the present invention, the pseudo yarn is joined to the skin material in the skin molding simultaneous base material adhesion step for adhering the skin material and the base material of the interior part. For example, when the skin material is molded using a vacuum molding die, for example. At the same time, while adhering the skin material to the surface of the base material, it is possible to form a stitch pattern (for example, a stitch decoration portion) of the interior part. In addition, since the thread pattern (for example, stitch decoration part) of the interior part is formed while the skin material and the base material are bonded, new molding is performed to form the thread pattern (for example, stitch decoration part). There is no need to provide a device, and the formation of a thread pattern (for example, a stitch decoration portion) does not cause a time loss in the skin material forming simultaneous base material bonding step in the interior part.

(4) An interior part manufactured by the method for manufacturing an interior part described in any one of (1) to (3),
The skin material and the pseudo yarn are both made of a thermoplastic elastomer.

  In the present invention, the skin material and the pseudo yarn are both made of a thermoplastic elastomer, so the melting temperatures are the same for the same material. Therefore, when joining the pseudo yarn to the skin material by heat welding, the skin material and the pseudo yarn can be melted together at the contact portion to increase the joining strength. In addition, even when the stitch decoration is formed by pushing the pseudo yarn into the skin material at a predetermined interval, the stretchability of the skin material and the pseudo yarn is high at the same level. There is little torn material. Therefore, the appearance of the thread pattern can be improved while maintaining the bonding strength between the pseudo thread and the skin material in the thread pattern.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of interior components and interior components which can improve the appearance of a thread pattern can be provided, maintaining the joining strength of the thread | yarn in a thread pattern, and skin material.

It is a perspective view of an interior part with a stitch decoration to which an embodiment according to the present invention is applied. It is typical sectional drawing of the stitch decoration part in the interior part with a stitch decoration of FIG. It is typical sectional drawing showing the manufacturing process of the interior part with a stitch decoration of FIG. It is a fragmentary perspective view showing the ditch | groove of the vacuum forming die shown in FIG.3 (c). It is a fragmentary perspective view showing the hot blade of the vacuum forming die shown in FIG.3 (c). FIG. 6 is a detailed view of a protrusion of the hot blade in FIG. 5. It is a schematic diagram showing the method of manufacturing the pseudo yarn for stitch decoration shown in FIG. It is a fragmentary sectional view at the time of skin molding of the vacuum forming die shown in FIG. It is A section sectional drawing in FIG. It is a B section sectional view in FIG. It is a fragmentary sectional view at the time of the stitch decoration molding of the vacuum forming die shown in FIG. It is the C section sectional view in FIG. It is the D section sectional view in FIG. It is a fragmentary perspective view showing the modification of the pseudo yarn for stitch decoration shown in FIG. It is typical sectional drawing showing the manufacturing process of the conventional interior part with a stitch decoration.

  Next, an interior component manufacturing method and an interior component according to an embodiment of the present invention will be described in detail with reference to the drawings.

<Structure of interior parts with stitch decoration>
First, the structure of an interior part with stitch decoration that is an embodiment according to the present invention will be described using an example of an instrument panel of an automobile. FIG. 1 shows a perspective view of an interior part with stitch decoration to which an embodiment according to the present invention is applied. FIG. 2 shows a schematic cross-sectional view of a stitch decoration portion in the interior part with stitch decoration of FIG.

  As shown in FIG. 1, an instrument panel 1 of an interior part with stitch decoration is an interior part having a substantially L-shaped cross section that covers the front face of a driver seat and a passenger seat from the lower end of a windshield. Since the instrument panel 1 is located in front of the driver's seat and the passenger seat, it can be said to be the face of interior parts that have been devised in terms of design. The instrument panel 1 includes an upper panel portion 11 whose front end is in contact with the front glass, a center cluster portion 12 in which an operation unit such as a car navigation system and an air conditioner is mounted in the center of the vehicle, and a meter cluster in which a speedometer and the like are mounted in front of the driver's seat. Part 13, lower panel part 14 covering the lower part of meter cluster part 13, side panel part 15 covering the front of the passenger seat, and storage part 16 covering the lower part of the side panel part.

  The instrument panel 1 has a decorative skin material bonded on a base material forming an overall shape. In the skin material, a texture pattern is formed to give a sense of quality and softness. In addition, a stitch decoration portion 17 that is similar to a thread seam is formed on the skin material so that an atmosphere of genuine leather specifications is generated. For example, in the instrument panel 1 shown in FIG. 1, a stitch decoration portion 17 is formed along a boundary line between the upper panel portion 11, the center cluster portion 12, the meter cluster portion 13, and the side panel portion 15. Yes.

As shown in FIG. 2, the stitch decorating portion 17 is a skin material 3 that locally has one pseudo yarn 2 having a twisted pattern in which a plurality of convex portions are formed in a spiral shape at intervals of about 6 to 8 mm. It is formed by biting into the inside. The pseudo yarn 2 is welded at a location where it contacts the skin material 3. The pseudo yarn 2 has a substantially star-shaped cross-sectional shape in which five convex portions (triangular shapes) are formed at equal intervals in the circumferential direction. The maximum diameter of the star-shaped cross section is about 1.0 to 1.5 mm. The material of the pseudo yarn 2 is an olefin elastomer (TPO). The elongation percentage of the pseudo yarn 2 is about 700 to 1000% (based on JIS standard K7113, but the interval between the chuck portions is set to 15 mm).
The skin material 3 has a two-layer structure on the top and bottom. The first layer 31 bonded to the base material 4 is a polypropylene foam (PPF) having a thickness of about 3 mm, and the second layer 32 formed on the first layer 31 has a thickness of about 0.6 mm. It is an olefin elastomer (TPO) having a thickness.

Since the first layer 31 to be bonded to the base material 4 is made of polypropylene foam (PPF), when the heat blade described later pushes the pseudo yarn 2 into the skin material 3, the first layer 31 made of the foam layer is greatly deformed. Thus, the stitches of the pseudo thread 2 to be decorated with the stitch can be deeply penetrated into the skin material 3. The second layer 32 formed on the first layer 31 and the pseudo yarn 2 are both made of an olefin elastomer (TPO), so that the seam of the pseudo yarn 2 is deeply penetrated into the skin material 3. Even when the stretchability of the second layer 32 and the pseudo yarn 2 is high at the same level, the elongation of the pseudo yarn 2 and the elongation at the contact portion 321 of the second layer 32 in contact with the pseudo yarn 2 are: Can balance each other. As a result, when the thermal blade described later pushes the pseudo thread 2 into the skin material 3, the pseudo thread 2 is hardly cut or the skin material 3 is hardly broken.
The pseudo yarn 2 for decorating the stitch can be a vinyl chloride-based or styrene-based thermoplastic elastomer. In that case, it is preferable that the second layer 32 of the skin material 3 is made of a homogeneous vinyl chloride-based or styrene-based thermoplastic elastomer. Moreover, the design property can be further improved by coloring the pseudo yarn 2 for stitch decoration into a color different from the color of the second layer 32 of the skin material 3.

<Method of manufacturing interior parts with stitch decoration>
Next, a method for manufacturing an interior part with stitch decoration will be described. FIG. 3 is a schematic cross-sectional view showing the manufacturing process of the interior part with stitch decoration shown in FIG.

As shown in FIGS. 3A to 3F, the interior part 1 with stitch decoration according to this embodiment can be manufactured by a base material forming step and a skin forming simultaneous base material bonding step.
That is, as shown in FIGS. 3A and 3B, a molten resin is injected into the injection mold 42 from the base material injection molding machine 41, and the base material 4 shaped into a predetermined shape by injection molding is obtained. Form (base material forming step). Then, as shown in FIG. 3C, the vacuum forming die 5 is opened and the base material 4 is attached to the upper die 51. The upper mold 51 is made of resin or aluminum casting.

In addition, the lower mold 52 of the vacuum forming mold 5 is formed with a concave groove 521 for inserting the artificial yarn 2 for stitch decoration on the mold surface 522 for molding the skin material 3, and the stitch inserted into the concave groove 521. A hot blade 53 is provided to push the decorative pseudo yarn 2 into the skin material 3. The pseudo yarn 2 for decorating the stitch is inserted into the concave groove 521. The mold surface 522 is engraved with a texture pattern. The lower mold 52 is made of porous electroforming. The hot blade 53 is produced by machining tool steel or the like. The hot blade 53 is heated to a predetermined temperature by a heater (not shown).
Further, as shown in FIG. 3 (d), the outer end of the skin material 3 with the adhesive applied to the upper surface is held horizontally by the holding part 63 of the heating device 6, and the heating parts 61 and 62 from the vertical direction. Heat. The heating device 6 is disposed adjacent to the vacuum mold 5.

Next, as shown in FIG. 3 (e), the skin material 3 is transferred onto the lower mold 52 of the vacuum forming mold 5 by the holding unit 63 in a heated state.
Thereafter, as shown in FIG. 3 (f), the skin material 3 is superposed on the base material 4 attached to the upper die 51 so that the vacuum forming die 5 is closed and sucked from the lower die 52. Molding is performed along the shape of the base material while performing the surface transfer to the surface of the material 3. Further, the skin material 3 and the base material 4 are bonded to each other while holding the mold closed for a predetermined time. While the vacuum forming mold 5 is in the mold-closed state and the skin material 3 and the base material 4 are bonded, the hot blade 53 is raised and the stitch decoration pseudo-yarn 2 inserted into the groove 521 is used as the skin material. Push the inside of 3. The pseudo yarn 2 pushed into the skin material 3 is welded to the skin material 3 by the heat of the hot blade 53. As a result, skin molding including stitch decoration and substrate adhesion can be performed simultaneously (skin molding simultaneous substrate adhesion process).
As described above, an interior part in which a stitch decoration portion and a texture pattern are formed is manufactured. In this manufacturing method, it is only necessary to have a base material forming step having an injection mold 42 and a skin forming simultaneous base material adhering step having a vacuum forming die 5, and an interior part with stitch decoration can be easily processed in two molds and two steps. Can be manufactured.

<Molding method of stitch decoration part>
Next, a method for forming a stitch decoration portion in the present embodiment will be described in detail. FIG. 4 is a partial perspective view showing the concave groove of the vacuum forming die shown in FIG. FIG. 5 is a partial perspective view showing the hot blade of the vacuum forming die shown in FIG. FIG. 6 shows a detailed view of the protrusion of the hot blade in FIG. In FIG. 7, the schematic diagram showing the method of manufacturing the pseudo yarn for stitch decoration shown in FIG. 2 is shown. FIG. 8 shows a partial cross-sectional view of the vacuum forming die shown in FIG. FIG. 9 shows a cross-sectional view of a portion A in FIG. FIG. 10 is a cross-sectional view of the B part in FIG. FIG. 11 shows a partial cross-sectional view of the vacuum mold shown in FIG. 3 (f) during stitch decoration molding. FIG. 12 is a cross-sectional view of a C portion in FIG. FIG. 13 is a cross-sectional view of a D portion in FIG.

As shown in FIG. 4, in the lower mold 52 of the vacuum forming mold 5, a concave groove 521 for inserting the pseudo yarn 2 for stitch decoration is formed on the mold surface 522 for molding the skin material 3. The width of the concave groove 521 is approximately the same as the maximum diameter of the pseudo yarn 2 for stitch decoration. The concave groove 521 is formed in the mold surface 522 of the lower mold 52. The lower mold 52 is an electroforming mold having fine porous suction holes. The lower mold 52 is connected to a vacuum pump (not shown).
Further, the lower mold 52 of the vacuum forming mold 5 is provided with a hot blade 53 for pushing the stitch decoration pseudo-yarn 2 inserted into the groove 521 into the skin material 3. In FIG. 4, the hot blade 53 is positioned below. The hot blade 53 slides in the vertical direction (the direction of the arrow K). The sliding amount of the hot blade 53 is the same length as the thickness of the skin material 3. Here, pushing the pseudo yarn 2 into the skin material 3 means that a part or all of the pseudo yarn 2 is surrounded by the skin material 3 or a part or all of the pseudo yarn 2 is the skin material 3. It means a state that has entered inside.

  As shown in FIGS. 4 and 5, the hot blade 53 has an acute-angled protrusion 531 that pushes the artificial thread 2 for stitch decoration into the skin material 3 at the upper end at a position corresponding to the seam. It is vacant and formed in parallel. The hot blade 53 has a connecting portion 532 formed of a curved surface that curves downward between the acute-angled protruding portion 531 and the protruding portion 531. As shown in FIG. 6, the tip 531a of the protrusion 531 is formed with a small radius R of about 0.3 mm. In addition, the inner angle θ of the inclined surface 531b of the protrusion 531 formed in an acute angle is preferably about 5 to 15 degrees. The height of the protrusion 531 relative to the center of the curved surface of the connecting portion 532 is preferably about 3 mm, and the distance between the protrusions 531 is preferably about 6 to 8 mm.

  As shown in FIG. 7, the pseudo-yarn 2 for decorating stitches is produced by cutting an injection-molded yarn 72 extruded using a yarn injection molding machine 7 into a predetermined length. The pseudo yarn 2 is a single pseudo yarn having a twisted pattern in which a plurality of convex portions are formed in a spiral shape. The spiral shape of the pseudo yarn 2 is formed by cooling the nozzle 71 of the injection port in the direction of the arrow R when the injection molded yarn 72 is extruded from the yarn injection molding machine 7. The cross section of the injection molding yarn 72 is substantially constant. Moreover, a required twist pattern can be easily formed by changing the speed at which the base 71 of the injection port is rotated and the shape of the opening cross section.

  As shown in FIGS. 8, 9, and 10, in the stage where the first layer 31 and the second layer 32 of the skin material 3 are superposed on the base material 4 attached to the upper mold 51 and the mold is closed, a hot blade is used. 53 is located below. The tip 531a of the protrusion 531 provided on the hot blade 53 is in contact with the pseudo-thread 2 for stitch decoration. At the initial stage of mold closing, the stitch decoration pseudo-yarn 2 is not pushed into the skin material 3. Therefore, by suction from the lower mold 52 of the vacuum mold 5, the texture is surely transferred to the surface of the second layer 32 of the skin material 3, and molding conforming to the shape of the base material is performed. Further, the vacuum forming die 5 is held in a die-closed state for a predetermined time to bond the skin material 3 and the base material 4 together. The predetermined mold closing time is about 50 to 100 seconds.

  As shown in FIGS. 11, 12, and 13, while holding the mold closed state, the hot blade 53 is moved upward to form the stitch decoration portion 17. As the acute-angled protrusion 531 rises at a position corresponding to the stitch 21, the stitch 21 of the pseudo thread 2 decorated with stitches is pushed deeply into the inside of the skin material 3 as if it was sewn with a sewing machine. To go. At this time, the hot blade 53 is heated to the melting point of the pseudo yarn 2 or higher. The pseudo thread 2 that comes into contact with the heated hot blade 53 is increased in flexibility and bends at an acute angle at the tip of the seam 21.

  The skin material 3 has a two-layer structure, and the first layer 31 bonded to the base material 4 is a polypropylene foam (PPF) made of a foamed layer. Therefore, when the hot blade 53 pushes the seam 21 of the pseudo thread 2 into the skin material 3, the pushing portion 311 of the first layer 31 made of the foam layer is greatly deformed. Further, since both the second layer 32 and the pseudo yarn 2 are made of an olefin elastomer, even when the seam 21 of the pseudo yarn 2 penetrates deeply into the inside of the skin material 3, the second layer 32 and the pseudo yarn 2 Since the stretchability is high at the same level, the seam 21 of the pseudo thread 2 and the contact portion 321 of the second layer 32 that contacts the seam 21 of the pseudo thread 2 extend evenly and tensile stress is increased. It is kept in balance. The stitches 21 of the pseudo thread 2 that have entered the inside of the skin material 3 are melted by the heat of the hot blade 53 and welded and joined to the contact portion 321 of the second layer 32.

Further, the thermal blade 53 has a connecting portion 532 formed with a curved surface that curves downward between the acute-angled protruding portion 531 and the protruding portion 531. Therefore, when the stitch decoration part 17 is formed, the connecting part 532 is separated from the transition part 22 of the seam 21, and the protruding part 531 is bitten more locally. Moreover, since the connection part 532 does not press the transition part 22 between the stitches 21 of the pseudo thread 2, the deformation of the pseudo thread 2 is small.
As described above, when the skin material 3 is molded using the vacuum forming die 5 and the skin material 3 is bonded to the surface of the base material at the same time, the stitch decoration portion 17 is formed. At that time, the bonding strength between the pseudo yarn 2 and the skin material 3 of the stitch decoration portion 17 is maintained at the same level as that of the sewing machine.

<Effect>
As described above in detail, according to the manufacturing method of the interior part 1 according to the present embodiment, the yarn pattern is formed by disposing the pseudo yarn 2 having a twisted pattern in which a plurality of convex portions 2B are formed in a spiral shape. Since it is formed by bonding to the skin material 3 of the part 1, unlike the normal twisted yarn formed by twisting thin fibers, the pseudo yarn 2 is hardly melted or deformed, and the pseudo yarn 2 and the skin material 3 are necessary. Bonding strength can be ensured. Further, since the pseudo yarn 2 itself has a twisted pattern in which a plurality of convex portions 2B are formed in a spiral shape, even when the pseudo yarn 2 is joined to the skin material 3, the knot pattern remains on the entire pseudo yarn 2. The appearance of the thread pattern can be improved.
In addition, since the plurality of convex portions 2B of the pseudo-yarn 2 constitute a star shape in which substantially the same triangular shape is assembled, it can be approximated to a twisted pattern of a normal twisted yarn. This can be further improved.

  Further, according to the manufacturing method of the interior part 1 according to the present embodiment, the spiral shape of the pseudo yarn 2 is obtained by rotating the base 71 of the injection port when the injection molding yarn 72 is extruded from the yarn injection molding machine 7. Since it forms by cooling, the pseudo | simulated yarn 2 approximated to the twist pattern can be formed with a uniform cross section. Moreover, the required twist pattern in the pseudo yarn 2 can be easily formed by changing the speed of rotating the nozzle 71 of the injection port and the shape of the opening cross section. In addition, the bonding strength can be increased by optimizing the molten state of the pseudo yarn 2 and the skin material 3 while considering the appearance of the yarn pattern.

  Moreover, according to the manufacturing method of the interior component 1 according to the present embodiment, the pseudo yarn 2 is formed by the skin forming material 3 bonding step in which the skin material 3 and the substrate 4 of the interior component 1 are bonded together. Since the skin material 3 is molded using the vacuum forming die 5 and the skin material 3 is bonded to the surface of the base material 4, the stitch decoration portion 17 that is the thread pattern of the interior part 1 is also formed. can do. Moreover, since the stitch decoration part 17 which is the thread pattern of the interior part 1 is formed while the skin material 3 and the base material 4 are bonded together, a new stitch decoration part 17 which is the thread pattern is formed. There is no need to provide a molding device, and the formation of the stitch decoration portion 17 that is a thread pattern does not cause a time loss in the skin material molding simultaneous base material bonding step in the interior part 1.

  Further, according to the interior part 1 according to the present embodiment, the skin material 3 and the pseudo yarn 2 are both made of thermoplastic elastomer, so that both are the same material and have the same melting temperature. Therefore, when joining the pseudo yarn 2 to the skin material 3 by welding, the skin material 3 and the pseudo yarn 2 are melted together at the contact portion, and the joining strength can be increased. Even when the stitch decoration portion 17 is formed by pushing the pseudo yarn 2 into the skin material 3 at a predetermined interval, the stretchability of the skin material 3 and the pseudo yarn 2 is high at the same level. The thread 2 is not cut or the skin material 3 is hardly broken. Therefore, the appearance of the stitch pattern can be improved while maintaining the bonding strength between the pseudo yarn 2 and the skin material 3 in the stitch pattern.

The embodiment described above can be changed without changing the gist of the present invention.
For example, in the above embodiment, the interior part is applied to an instrument panel of an automobile, but the present invention is not limited to this. For example, the present invention can be applied to various interior parts such as a console box and a door trim which are internal parts with stitch decoration.
In the above embodiment, the spiral shape of the pseudo yarn 2 is formed by cooling while rotating the base 71 of the injection port when the injection molded yarn 72 is extruded from the yarn injection molding machine 7, but is not limited thereto. There is nothing. For example, as shown in FIG. 14, it can also be formed by a method in which a plurality of injection-molded yarns 81, 82, 83 that have been injection-molded are integrated while being spirally twisted. Note that the injection-molded yarns 81, 82, and 83 do not have to be joined to each other.

  INDUSTRIAL APPLICABILITY The present invention can be used as a method for manufacturing an interior part in which a thread pattern is formed and an interior part.

1 Instrument panel (interior parts)
2 Pseudo yarn 2B Convex part 3 Skin material 4 Base material 5 Vacuum forming die 6 Heating device 7 Yarn injection molding machine 17 Stitch decoration part 21 Stitch 22 Crossing part 31 First layer 32 Second layer 51 Upper mold 52 Lower mold 53 Hot Blade 71 Base 72 Injection Molding 521 Groove 522 Mold Surface 531 Projection

Claims (4)

A method of manufacturing an interior part that forms a thread pattern on the surface,
The method for manufacturing an interior part, wherein the thread pattern is formed by joining a pseudo thread having a twist pattern in which a plurality of convex portions are formed in a spiral shape to a skin material of the interior part. In the manufacturing method of the interior component described in claim 1,
The method of manufacturing an interior part, wherein the spiral shape of the pseudo yarn is formed by cooling while rotating a die of an injection port when the injection molded yarn is extruded from an injection molding machine. In the manufacturing method of the interior component according to claim 1 or 2,
The pseudo yarn is joined to a skin material in a skin molding simultaneous base material bonding step in which the skin material and the base material of the interior part are bonded to each other. In the interior component manufactured by the interior component manufacturing method according to any one of claims 1 to 3,
Both the skin material and the pseudo yarn are made of a thermoplastic elastomer.

Images