JPH11138614A - Production of decorative molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a decorative resin molding which can mold a smooth decorative surface continuously irrespective of the shape of the molding. SOLUTION: An extruder having the first molding port for molding a decorative molding 1 and the second molding port for extrusion-molding a provisional coating material for coating at least the decorative surface 101 of the molding, a molding resin is supplied to the first molding part, and the decorative molding is molded. Simultaneously, a coating resin is supplied to the second molding port to mold a provisional coating material, which is overlaid on the surface of the molding to extrusion-mold an integrated molding, and the provisional coating material is peeled off from the surface of the decorative molding to obtain a decorative molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a decorative molded article having a smooth surface by extrusion molding.

[0002]

2. Description of the Related Art As shown in FIG. 19, a frame-shaped decorative molded body 92 is attached to the periphery of a glass window 95 of an automobile. As a mounting method, for example, there is a method of extruding a resin from an extrusion nozzle while rotating a glass window to a fixed extrusion nozzle according to its shape (CSE molding method) (Japanese Patent Publication No. 7-119044,
JP-A-6-71722). Further, Japanese Patent No. 2502456 discloses a method in which a rainwater receiving groove is provided in a resin frame around the glass window, and the entire head is formed substantially horizontally.

[0003]

However, in the above-mentioned conventional extrusion molding method, there is a problem that irregularities 929 are formed on the surface of the decorative molded body 92 as shown in FIG. The possible causes are as follows.

[0004] Since the molding opening for shaping the shape is connected to the extruder or located near the cutting machine for cutting the molded body, the vibration generated when the extruder or the cutting machine is operated generates vibration. And the surface of the decorative molded body becomes uneven. CS
In the E molding method, the panel is fixed by suction,
In some cases, the vibration of the robot, which is the panel moving means, is transmitted to the panel, and the surface of the decorative molded body becomes uneven.

[0005] Usually, a molding resin material is extruded in contact with a molding opening. However, when the vibration is transmitted to the molding port, the molding resin material comes into contact with or separates from the molding port, and is extruded while repeating this. Therefore, the surface of the decorative molded body becomes uneven due to the repetition of such contact and non-contact.

Therefore, as a method for smoothing the design surface of such a molding, a molding die 90 has conventionally been used as shown in FIG.
The surface of the decorative molded body 92 extruded from the
Is pressed to prevent the film 93 and the decorative molded body 92 from moving relative to each other, and the film 93 is peeled off after cooling (JP-A-1-308615). The film 93 is supplied from a winding roller 930. Pressing of the film 93 onto the decorative molded body 92 is performed by a delivery roller 94.

However, in this method, if the shape of the decorative molded body 92 is not straight in the extrusion longitudinal direction, if the cross-sectional shape changes, or if the surface is curved, a film is applied along the curved surface. It becomes difficult. In the event that the film 93 is adhered with a gap formed between the film 93 and the decorative molded body 92, the irregularities on the surface of the decorative molded body formed by the vibration of the molding opening remain.

Further, when the film 93 wound around the winding roller 930 runs out, it is necessary to temporarily stop the extrusion and replace the winding roller 930. Therefore, continuous molding is difficult and not suitable for mass production. Furthermore, it is difficult to reuse the film 93 peeled from the decorative molded body 92.

In view of the above-mentioned conventional problems, the present invention provides a method of manufacturing a decorative molded article that can be smoothly formed into a decorative surface regardless of the shape of the decorative molded article and that can be continuously molded. It is intended to provide.

[0010]

According to the present invention, there is provided a method for manufacturing a decorative molded body having a design surface, wherein a first molding opening for molding the decorative molded body and a temporary molding port for covering at least the design surface of the decorative molded body are provided. Using an extruder having a second molding port for extruding the coating material, a molding resin is supplied to the first molding port to form a decorative molded body, and concurrently with this, the second molding is performed. By supplying the coating resin to the mouth and forming the temporary covering material, the temporary covering material is superimposed on the surface of the decorative molded body, and an integrally molded product is extruded. This is a method for producing a decorative molded body, which comprises removing a material to obtain a decorative molded body.

The operation and effect of the present invention will be described.
In the present invention, the molding resin is supplied to the first molding port to form a decorative molded body, and at the same time, the coating resin is supplied to the second molding port so that at least the design surface of the decorative molded body is provided. The temporary covering material is extruded to cover. As a result, an integrally molded product including the decorative molded body and the temporary covering material that covers at least the design surface is obtained. The temporary covering material has low compatibility with the decorative molded body. Therefore, after cooling, the temporary covering material is peeled from the decorative molded body, and the decorative molded body is obtained.

It should be noted here that even if the first and second molding ports vibrate, the vibrations only form irregularities on the surface of the integrally molded product, and are formed inside the integrally molded product. It does not affect the design of decorative molded articles. for that reason,
The decorative molding has a smooth design surface.

[0013] The coating resin can be continuously injected into the cavity from the second molding port. Similarly, the molding resin can be continuously injected from the first molding port. Therefore, the decorative molded body can be continuously molded, and mass productivity is improved. Also, the coating resin can be reused after peeling by melting or the like.

Next, the details of the present invention will be described. The coating resin has low compatibility with the molding resin. Such a coating resin is relatively selected in relation to the molding resin. For example, when the molding resin is PVC (meaning polyvinyl chloride resin; the same applies hereinafter), the coating resin is PP (meaning polypropylene; the same applies hereinafter), T
PO (means a thermoplastic olefin resin; the same applies hereinafter). Further, these materials can be used in reverse.

The first forming port is formed between the fixed die and a movable shutter movable relatively to the fixed die, and moves the movable shutter relatively to the fixed die. It is preferable to extrude the integrally molded product while changing the opening state. Thereby, it is possible to obtain decorative molded bodies having different cross-sectional shapes along the extrusion longitudinal direction.

The extruder has a core port for supplying a core material into the first molding port, and the core material is supplied from the core port into the first molding port in accordance with the extrusion speed of the integrally molded product. Preferably, it is sent. As a result, a molded product incorporating the core material is obtained. As the core material, for example, a metal core or the like can be used.

Further, the extruder can be provided with an opening for slidably holding the peripheral edge of the plate in the first molding opening. Thereby, the decorative molded body can be formed on the peripheral edge of the plate. Examples of the plate include a glass plate such as an automobile window glass, a resin plate, and the like. Further, the decorative molded article may be a single-color molded article composed of a single layer or a multi-color molded article composed of a plurality of layers.

The decorative molded article produced according to the present invention can be used, for example, for a window molding, a side molding, a roof molding, a drainer inner, a drainer outer, etc. mounted on the periphery of a window glass for automobiles.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A method for manufacturing a decorative molded article according to an embodiment of the present invention will be described with reference to FIGS. In the manufacturing method of this example, the design surface 101 of the decorative molded body 1 containing the core material 5 is
In the state of being covered with the temporary covering material 2, it is integrally extruded (FIG. 2), and after cooling, the temporary covering material 2 is peeled off to expose the design surface 101 (FIG. 1) to obtain the decorative molded body 1. . Hereinafter, this will be described in detail.

First, a molding resin for molding a decorative molded body and a coating resin having low compatibility with the molding resin are prepared. PVC is used as the molding resin. PP is used as the coating resin. Also, a steel plate is prepared as a core material.

Next, as shown in FIGS. 2 to 4, an extruder 3 is prepared. As shown in FIG. 3, the extrusion molding machine 3 has a first molding port 31 for extruding the decorative molded body 1.
And a second molding opening 32 for extruding the temporary covering material 2 for covering the design surface 101 of the decorative molded body 1. As shown in FIGS. 3 and 4, the extrusion molding machine 3 includes a first nozzle 33 (FIG. 4A) for supplying the molding resin 10 to the first molding port 31 and a second molding port 32. Nozzle 34 (FIG. 4) for supplying coating resin 20 to
(B)).

The second molding opening 32 is opened at a portion of the first molding opening 31 through which the design surface 101 of the decorative molded body 1 passes. The second molding port 32 is provided on the design surface 1 of the decorative molded body 1.
01, so that it gradually widens toward the downstream side. Until the second molding port 32 reaches its maximum opening, the partition wall 3 is located between the second molding port 32 and the first molding port 31.
9 A metal core port 35 for supplying the core material 5 to the first molding port 31 is provided upstream of the first molding port 31. As shown in FIG. 4, the first molding port 31 is
It has substantially the same cross-sectional shape as the design cross-sectional shape of the decorative molded body 1.

Next, as shown in FIG.
3, the molding resin 10 is supplied to the first molding port 31 to extrude the decorative molded body 1 and the first molding port 31 is supplied to the first molding port 31 from the core material port 35.
The core material 5 is fed into the molding port 31 and the core material 5 is built in the decorative molded body 1. Subsequently, the second molding port 32 is supplied from the second nozzle 34.
The temporary coating material 2 is extruded by supplying the coating resin 20 to the substrate. As a result, as shown in FIG. 6, the temporary covering material 2 is overlaid on the design surface 101 of the decorative molded body 1 to obtain the integrally molded product 6.

Next, the integrally molded product 6 is cooled and the resin is cured. Thereafter, the temporary covering material 2 is peeled off from the integrally molded product 6 to obtain the decorative molded body 1. The obtained decorative molded body 1 is
Used for automobile side moldings.

Next, the operation and effect of this embodiment will be described. In the manufacturing method of the present embodiment, as shown in FIGS.
An integral molded product 6 composed of the temporary covering material 2 for covering the material 01 is extruded. The temporary covering material 2 has low compatibility with the decorative molded body 1 made of a molding resin. Therefore, the temporary covering material 2 can be separated from the decorative molded body 1 after cooling, and the decorative molded body 1 can be obtained.

It should be noted here that even if the first and second molding ports 31 and 32 vibrate, the vibration only forms irregularities only on the surface of the integrally molded product 6. Has no effect on the design surface 101 of the decorative molded body 1 formed inside. Therefore, the design surface 101 of the decorative molded body 1
Results in a smooth surface.

Further, as shown in FIG. 5, the coating resin 20 can be continuously supplied to the design surface 101 of the decorative molded body 1 from the second molding opening 32. Similarly, the molding resin 10 can be continuously supplied to the first molding port 31.
Therefore, the decorative molded body 1 can be continuously molded, and mass productivity is improved. Further, the temporary covering material 2 can be reused by melting or the like after peeling.

Embodiment 2 As shown in FIG. 7, this embodiment is a method of forming a decorative molded body 1 whose cross-sectional shape is variable in the longitudinal direction of extrusion. The decorative molded body 1 is a member interposed between a vehicle body panel and a glass panel and fixing the two together. The decorative molded body 1 is composed of a head portion 102 whose width changes in the extrusion longitudinal direction and a leg portion 103 having a constant width. Become. The head 102 has a rainwater receiving groove 105 in a part thereof, and a locking portion 104 for locking to a vehicle body panel is provided on the back surface thereof. The leg 103 is provided with a U-shaped concave portion 106 for fixing the glass panel.

As shown in FIG. 8, the extrusion molding machine 3 for molding the decorative molded body 1 has a fixed die 311, a vertically movable die 312 movable with respect to the fixed die 311, and a left and right movable shutter 313. . The up / down movable shutter 312 and the left / right movable shutter 313 are respectively the first
Sliders 314, 3 provided below and to the left of the molding opening 31
The guide member 15 slides vertically and horizontally to change the cross-sectional shape of the first molding port 31.

As shown in FIGS. 8 and 9, molding of the integrally molded product 6 is performed while gradually moving the vertically movable shutter 312 and the left and right movable shutter 313. Specifically, when forming the cross-section taken along line CC of FIG. 7A, as shown in FIG.
The left and right movable shutters 313 are moved to the left, and the first forming port 31 is reduced and opened. When molding the cross section taken along line DD of FIG. 7A, as shown in FIG. 9, the vertically movable shutter 312 is moved downward and the left and right movable shutter 313 is moved rightward, and the first molding opening is formed. 31 is largely opened downward, and the edge portion 316 of the left and right movable shutter 313 is projected from the left side. Then, an integrally molded product 6 whose sectional shape gradually changes is obtained.

Thereafter, the temporary covering material 2 is peeled off from the surface of the decorative molded body 1 to obtain the decorative molded body 1 as shown in FIG. The obtained decorative molded body 1 is
1 is smooth. Other configurations are the same as those of the first embodiment. Also in this example, the same effect as in the first embodiment can be obtained.

Embodiment 3 This embodiment is a method for manufacturing a decorative molded body having a variable sectional shape. This decorative molded body is the same as the decorative molded body of Embodiment 2 except that it does not have a rainwater receiving groove. As shown in FIG. 10, the extrusion molding machine 3 used in the present manufacturing method has a vertically movable shutter 3 having no left and right movable shutters.
12 except that the second nozzle 34 is provided on the vertically movable shutter 312,
This is the same as the second embodiment. As shown in FIG. 11, the coating resin 20 is supplied from the second nozzle 34 to the second molding port 3.
2 and then from the second molding port 32 to the design surface 101 of the decorative molded body 1 in the first molding port 31 to extrude the temporary covering material 2.

At the time of extrusion molding, a vertically movable shutter 312
Moves up and down with time to change the cross-sectional shape of the first molding port 31. When the vertically movable shutter 312 is located below, the sectional shape of the decorative molded body 1 is small (FIG. 12).
(A)), when it is located above, the sectional shape of the decorative molded body 1 becomes large (FIG. 12 (b)). Others are the same as the second embodiment. In this example, the same effect as in the second embodiment can be obtained.

Embodiment 4 This embodiment is a method of integrally forming a frame-shaped decorative molded body on the periphery of a window glass. This decorative molded body is the same as the decorative molded body of Embodiment 2 except that it does not have a rainwater receiving groove. As shown in FIG. 13, the first molding port 31 of the extrusion molding machine 3 is provided with an opening 317 for opening the side surface thereof to slidably insert the periphery of the window glass 50 into the first molding port 31. Have been.

The window glass is held by a holding device (not shown) so as to be relatively movable with respect to the extruder 3 in accordance with the resin extrusion speed. Wind glass 50
Extrusion molding is performed while moving relatively to the extruder 3 at the peripheral portion of. As a result, the entire periphery of the window glass 50 is bordered by the integrally molded product 6.

As shown in FIG. 14, after the resin is cured, the temporary covering material 2 is peeled from the decorative molded body 1. As a result, the frame-shaped decorative molded body 1 is formed on the periphery of the window glass 50. Other configurations are the same as those of the first embodiment. Also in this example, the same effect as in the first embodiment can be obtained.

Fifth Embodiment As shown in FIG. 15, this embodiment is a method for manufacturing a decorative molded body 1 composed of a two-color molded body. That is, as shown in FIG. 15, the decorative molded body 1 obtained by the present example is obtained by integrally extruding the first molded part 15 and the second molded part 16, and the core material 5 is formed therein. Built-in. In manufacturing the decorative molded body 1, two types of molding resins 1 are used.
Black PVC and gray PVC are prepared as 05 and 106, and PP is prepared as the coating resin 20. Further, a steel plate is prepared as the core material 5.

Next, as shown in FIGS. 16 to 18, a first forming opening 31 for integrally extruding the first and second forming portions 15 and 16 and a first forming opening 31 for extruding the temporary covering material 2 are formed. And a second molding port 32. Further, the extruder 3 includes a core material port 35 for supplying the core material 5 to the first molding port 31,
Two first nozzles 335 and 336 for supplying the molding resins 105 and 106 to the first molding port 31, respectively, and a second nozzle 34 for supplying the coating resin 20 to the second molding port 32. Have. Other structures of the extruder 3 in this example are the same as those in the first embodiment.

Next, the molding resins 105 and 106 are supplied from the first nozzles 335 and 336 to the first molding port 31, and
The decorative molded body 1 composed of two colors of black and gray is extruded, the core material 5 is supplied and the coating resin 20 is supplied, and the integrally molded product 6 is extruded. Then, the temporary covering material 2
Is peeled off to obtain the decorative molded body 1. In the present embodiment, the decorative molded body 1 of two colors is extruded together with the temporary covering material 2, but the decorative molded body 1 having a smooth design surface 101 is formed by peeling of the temporary covering material 2 as in the first embodiment. Can be obtained.

[0040]

According to the present invention, it is possible to provide a method for manufacturing a decorative molded article that can be formed into a decorative molded article having any shape with a smooth design surface and that can be continuously formed. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method of peeling a temporary covering material from a decorative molded body according to a first embodiment.

FIG. 2 is a perspective view of an extruder during molding in the first embodiment.

FIG. 3 is a cross-sectional view of the extrusion molding machine according to the first embodiment.

4 (a) is a cross-sectional view taken along line AA of FIG. 3, and FIG.
Sectional view (b) of FIG.

FIG. 5 is a cross-sectional view of the extrusion molding machine at the time of molding in the first embodiment.

FIG. 6 is a cross-sectional view of the integrally molded product according to the first embodiment.

7A is a front view of the decorative molded body according to the second embodiment, FIG. 7A is a cross-sectional view taken along line DD of FIG. 7A, and FIG.
Sectional view taken along line CC of FIG.

FIG. 8 is a perspective view of an extrusion molding machine for showing an opening state of a first molding port when molding a cross-section taken along line CC of FIG. 7 (a).

FIG. 9 is a perspective view of an extrusion molding machine for showing an opening state of a first molding port when molding a cross-section taken along line DD of FIG. 7A.

FIG. 10 is a perspective view of an extruder in a third embodiment.

FIG. 11 is a cross-sectional view of an extruder during molding in a third embodiment.

12A and 12B are a cross-sectional view of a first forming port with an enlarged opening and a cross-sectional view of a first forming port with a reduced opening in a third embodiment.

FIG. 13 is a cross-sectional view of an extruder near a first molding port in a fourth embodiment.

FIG. 14 is an explanatory view showing a method of peeling a temporary covering material from a decorative molded body according to a fourth embodiment.

FIG. 15 is an explanatory view showing a method of peeling a temporary covering material from the decorative molded body of the fifth embodiment.

FIG. 16 is a perspective view of an extrusion molding machine at the time of molding in a fifth embodiment.

FIG. 17 is a cross-sectional view of an extruder during molding in a fifth embodiment.

18 is a sectional view taken along line EE in FIG. 17;

FIG. 19 is an explanatory diagram showing a problem of a conventional example.

FIG. 20 is an explanatory view showing a method of smoothing a design surface of a molded product in a conventional example.

[Explanation of symbols]

 1. . . Decorative molded article, 10, 105, 106. . . Molding resin, 101. . . Design surface, 2. . . Temporary covering material, 20. . . 2. coating resin; . . Extruder, 31. . . First molding port, 32. . . Second molding port, 33, 335, 336. . . First nozzle, 34. . . Second nozzle, 35. . . Core opening, 39. . . Fusion wall, 311. . . Fixed die, 312. . . Up / down movable shutter, 313. . . Left and right movable shutter, 317. . . Opening, 5. . . Core material, 50. . . 5. Wind glass, . . One-piece molding,

Claims (2)

[Claims] 1. A method of manufacturing a decorative molded body having a design surface, wherein a first molding opening for molding the decorative molded body and a temporary covering material for covering at least the design surface of the decorative molded body are extrusion-molded. A molding resin is supplied to the first molding port to form a decorative molded body by using an extruder having a second molding port for performing molding, and the resin for coating is formed in the second molding port at the same time. Is supplied to form a temporary covering material, whereby the temporary covering material is superposed on the surface of the decorative molded body to extrude an integrally molded product, and the temporary covering material is peeled off from the surface of the decorative molded body. And a method for producing a decorative molded body, characterized by obtaining a decorative molded body. 2. The method according to claim 1, wherein the first molding port is
An integrally molded article is formed between the fixed die and a movable shutter relatively movable with respect to the fixed die, and moves the movable shutter relatively with respect to the fixed die to change an opening state. A method for producing a decorative molded article, characterized by extruding.