JP2000135733A - Method and device for manufacture of decorative hollow body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a decorative hollow body for attaching various decorative materials beautifully without forming creases on the surface of a blow molded body simultaneously with blow molding the blow molded body and also provide a compact manufacturing device for the decorative hollow body to be driven simply and manufactured inexpensively even when a number of kinds of hollow bodies are manufactured. SOLUTION: First and second molds 2 and 3 with molding cavities for a hollow body are mold opened, and a third mold 6 driven separately and individually between both molds 2 and 3 is inserted therein. Molds 2 and 3 are moved in the mold closing direction, and the molding cavity of the first mold 2 is pressed on the molding face of the third mold 6, and decorative materials are formed preliminarily and then the third mold 6 is retracted from between the molds 2 and 3 and the decorative hollow body is blow molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a blow molded article (hereinafter referred to as a decorative hollow body) having a surface provided with a decorative material, such as an instrument panel in a vehicle interior, and the like. More specifically, the present invention relates to a method and an apparatus for manufacturing a decorative hollow body capable of integrally adding a decorative material to the outer surface of the hollow resin body without wrinkles while molding the hollow resin body.

[0002]

2. Description of the Related Art Conventionally, a decorative material has been added to a synthetic resin product for the purpose of decoration. Examples of synthetic resin products with decorative materials are rear luggage trims, door trims, seat backs, ceiling members, etc. installed on the interior walls of automobiles. When an occupant collides with an inner wall surface at the time of occurrence or the like, it is required to reduce the impact and to reduce the weight.
Therefore, these synthetic resin products usually employ a hollow structure. As the decorating material, a wood-grain or leather-like resin sheet, natural leather, cloth, nonwoven fabric, or the like is used.

A method for manufacturing such a decorated hollow body is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-35930. According to the manufacturing method disclosed in the publication, a fabric material having excellent extensibility is arranged on the entire outer periphery or a part of the parison, the parison and the fabric material are sandwiched between molds, and the parison is squeezed into the parison. Blow molding is performed by blowing air. When the parison expands by blowing compressed air into the parison, the fabric material expands and is welded and integrated with the parison when pressed against the inner surface of the mold and after cooling, and the inner surface of the mold is cooled. A decorative hollow body having an external shape along the shape is formed. When it is desired to further increase the adhesive force between the fabric material and the parison, a material obtained by attaching a hot melt film to the back surface of the fabric material is used, or an adhesive is applied to the back surface of the fabric material. . This has the advantage that the fabric material can be easily and rationally covered on at least a part of the surface of the hollow body made of synthetic resin.

[0004] For example, Japanese Patent Application Laid-Open No. 4-255321 discloses a state in which a film compatible with a parison is lightly tensioned on the inside of one of the blow molding dies by rollers arranged vertically. And blow molding. During the blow molding, the film is softened by the heat of the parison, and comes into contact with the inner surface of the molding die together with the parison to form a blow molded hollow body along the inner surface shape of the die. For this reason, the film is attached to and integrated with the surface of the hollow body, and exhibits a beautiful appearance without flow unevenness or mold damage.

[0005] For example, Japanese Patent Application Laid-Open No. 3-236921 discloses a method and a device for manufacturing a plate-shaped synthetic resin product having a decorative sheet material attached to the surface by injection molding. The manufacturing apparatus disclosed in the publication includes a fixed mold and a movable mold having a resin flow path, fixing means for vertically fixing a decorative sheet material inside the movable mold, and sheet material heating on one surface side. And a sheet material forming means having a pressing core for sheet material shaping on the other surface side.

In order to manufacture a decorative resin product by the same apparatus, the sheet material forming means is inserted between the two molds in the mold open state with the heater facing the movable mold, and at the same time, A decorative sheet material is fixed inside the movable mold, and the decorative sheet material is heated by the heater. At this time, the movable mold is at the first position close to the heater. Thereafter, the movable mold is moved to the second position in the mold opening direction to sufficiently separate the two molds, and then the sheet material forming means is reversed, and the pressing core faces the inside of the movable mold. In this state, the movable mold is moved in the mold closing direction to a third position in contact with the pressing core, and the movable mold is pressed against the pressing core, so that the sheet material has a cavity shape of the movable mold. Pre-shape. Thereafter, the movable mold is moved again in the mold opening direction to the second position, the sheet material forming means is retracted from between the molds, and further, a fourth position where the movable mold abuts on the fixed mold. Move to, close the mold, and perform injection molding. According to this method, since the sheet material is preformed into the cavity shape of the movable mold, the sheet material is attached to the surface of the resin product without wrinkles.

[0007]

However, in the method of manufacturing a decorated hollow body disclosed in Japanese Patent Application Laid-Open No. 61-35930, when the parison expands by blowing compressed air into the parison, The fabric material is stretched in response to the bulge of the parison,
Limited to those with excellent extensibility. That is, when a fabric material having a low extensibility is used, the parison is cooled by air cooling and blowing air, and the plasticity is apt to decrease, so that the expansion of the parison is further restricted by the fabric material, and the parison does not extend sufficiently. In addition, there is a problem that uneven thickness or breakage occurs in the hollow molded article. For this reason, it is necessary to pay attention to the temperature and the state of the parison and the like so that the plasticity of the parison is reduced and the adhesiveness with the fabric material is not reduced, thereby reducing the production efficiency and increasing the equipment cost. There is also a problem of causing such problems.

On the other hand, in the method for manufacturing a decorative hollow body disclosed in Japanese Patent Application Laid-Open No. 4-255321, the film is not sufficiently softened by the heat of the parison in order to obtain the above-mentioned effects. The decorative sheet material is compatible with the parison and has a softening point of 150 ° C.
It is limited to the following films. That is, when a film or a cloth or a nonwoven fabric having a softening point higher than 150 ° C. is employed as the decorative sheet material, the decorative sheet material is incompletely softened only by the heat of the parison. The decorative sheet material is not uniformly adhered, and due to shrinkage after molding, there is an inconvenience such that the decorative sheet material is locally wrinkled or the decorative sheet material is unnaturally tensioned. Furthermore, since the decorative sheet material is not heat-softened in advance, and the heating softening by the parison is not sufficiently performed, the expansion of the parison at the time of blow molding is prevented by the decorative sheet material, and the desired form is obtained. In some cases, it is not possible to obtain a molded hollow body having the same.

On the other hand, in the apparatus for manufacturing a decorative resin product disclosed in Japanese Patent Application Laid-Open No. Hei 3-236921, a heater for heating a sheet material and a pressing core for pre-shaping the sheet material include a sheet. Since the same drive shaft is provided on the front and back of the same drive shaft as the material forming means, the drive shaft must be rotated when the sheet material is heated by the heater and then pressed by the pressing core. Therefore, in addition to the reciprocating drive for inserting and removing the forming means between the molds, the drive shaft of the sheet material forming means needs the above-described rotary drive, and the driving becomes complicated.

Further, since the heater and the pressing core have different protrusion dimensions from the drive shaft, the movable mold is rotated when the sheet material is rotated by the heater after the sheet material is heated by the heater. Must be retracted from the second position to the third position. That is, the movable mold must reciprocately drive a number of positions from the first position to the fourth position, which complicates the control mechanism.
In addition, the number of movements of the movable mold increases, and the molding efficiency decreases. Further, in order to rotate the sheet material forming means, a large space is required between the dies, and the size of the apparatus is increased.

Further, when manufacturing resin products having different surface shapes, it is necessary to change the mold and the pressing core. However, the sheet material forming means comprises the pressing core and the heater integrally assembled. Therefore, it is difficult to change only the pressing core alone. Further, when manufacturing various types of resin products, if the entire sheet material forming means is changed, the same number of heaters as the number of pressing cores are required, and the apparatus becomes expensive, so that the product cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the present invention provides a decorative member that is blow-molded into a hollow body and is beautifully and efficiently attached to the surface of the hollow body without wrinkles. It is an object of the present invention to provide a method of manufacturing a decorative hollow body and a manufacturing apparatus thereof, and furthermore, it is possible to manufacture the hollow body at a low cost even when manufacturing various kinds of hollow bodies, and the control drive is simple and compact. An object of the present invention is to provide an apparatus for manufacturing a hollow body.

[0013]

In order to solve the above problems, the present invention relates to a method for manufacturing a decorative hollow body having a surface provided with a decorative material, wherein the blow molded article is provided. Opening the first and second molds having the molding cavity of the above, inserting a third mold having a molding surface for decorative material molding between the first and second molds, At least one of the first and second molds and the third mold are relatively close to each other, and are formed between at least one of the first and second molds and the third mold. Molding the decorating material by introducing the molten resin material of the decorating material into the decorating material molding cavity to be formed, and molding the mold of at least one of the first and second molds. Making the third mold relatively apart from the third mold together with the decorating material; Be retracted from between, placing the parison between said first and second mold and the first
And a method of manufacturing a decorative hollow body, which comprises closing the second mold and performing blow molding.

According to the above method, the molten resin raw material of the decorating material is introduced into the decorating material forming cavity formed between at least one of the first and second molds and the third mold. Since the decorating material is formed in advance, the parison expands uniformly without being hindered by the decorating material.
Therefore, a hollow body having a substantially uniform thickness can be obtained.
Further, the obtained decorative hollow body has an excellent appearance design in which the decorative material is uniformly affixed to the surface without locally wrinkling or unnatural tension.

Since both sides of the third mold have a molding surface for forming a molding cavity for a decorative material between at least one of the first and second molds, for example, a hollow surface is formed. It is possible to decorate the same kind of decorating material on the entire circumference or part of the body, or decorate different kinds of decorating materials with each other, and to provide a variety of appearance designs. Become.

In order to make the third mold face both molds, it is only necessary to insert and remove the third mold independently between the two molds, and to open and close the first and second molds. In addition, there is no need to move the first and second molds. Therefore, the movement position of the mold is sufficient at three positions in one direction of the mold opening position, the decorating material molding position, and the blow molding position, and the control driving thereof is simplified, and the number of movements of the mold is reduced. Therefore, production efficiency is significantly improved.

When the decorative material is formed in advance, for example, when the first and second molds are moved toward the third mold,
The case where the third mold is moved toward the first and second molds, the case where either one of the first and second molds and the third mold are moved toward each other, and the like. There is. In any case, since the conventional drive mechanism involving rotation is not necessary, the drive mechanism is significantly simplified. For example, when the first or second mold is moved, each of the molds is required. It is sufficient to use a mold opening / closing mechanism in blow molding. The mechanism is the simplest, and the molding time can be shortened.

In the present invention, as the material of the hollow body,
For example, polyethylene, ABS, mPPO, PC, TPE
Etc. can be used. Further, as the decorative material, for example, polypropylene, polyethylene, A
BS, PC, TPE, etc. are applicable. When pre-molding the decorative material, it is possible to apply various types of molding methods such as injection molding, compression molding, and foam molding, and to decorate a desired decorative material in hollow bodies of various shapes. It is possible to do.

Thus, as in the invention according to claim 2, the molten resin raw material of the decorating material is formed between at least one of the first and second molds and the third mold. Injection molding into the molding cavity. In the invention according to claim 3, a decorating material molding cavity formed between at least one of the first and second molds and the third mold by using a molten resin material of the decorating material. And compression molding.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a decorative hollow body having a surface provided with a decorative material, wherein the first and second molds each have a molding cavity for the decorative hollow body. Opening the mold, disposing a decorative sheet material inside at least one of the first and second molds,
Inserting a third mold having a molding surface for decorating a decorative material between the molds, causing one of the molds on which the decorative sheet material is arranged and the third mold to relatively approach to each other. Introducing a molten resin material into a decorating material forming cavity formed between the decorating sheet material and the third mold to form a decorating material with a decorating sheet material. At least one of the molds of the second mold is relatively separated from the third mold together with the formed decorative material with the decorating sheet material; The method includes retreating from between two molds, disposing a parison between the first and second molds, and closing and blow molding the first and second molds.

According to the above method, the molten resin material is introduced into the decorative material molding cavity formed between the decorative sheet material and the third die to form the decorative material with the decorative sheet material. Because of the molding, the parison expands uniformly without being hindered by the decorating material with the decorating sheet material. For this reason, it is possible to obtain a hollow body having a substantially uniform thickness, and the obtained decorative hollow body has a surface on which the decorative material is not locally wrinkled or unnaturally tensioned. Excellent in appearance design affixed uniformly.

According to a fifth aspect of the present invention, the method includes bringing the decorative sheet material along a molding cavity of at least one of the first and second molds by vacuum suction and / or air pressure. . It is preferable that the decorative sheet material be extensible at normal temperature or at the time of overheating. When the decorative sheet material is difficult to stretch or when there is a possibility that the appearance may be damaged due to the stretching, the decorative sheet material may be heated in advance in order to facilitate the extension of the decorative sheet material. After heating to a sufficient temperature to soften, it is preferable to apply vacuum molding and / or compressed air along the molding cavity of at least one of the first and second molds.

The decorative sheet material is stretched over a molding cavity of at least one of the first and second dies by, for example, a decorative sheet material supply device having a tension roller, and the like. By vacuum suction and / or
Alternatively, it is preferable that the compressed air is formed along the molding cavity of at least one of the first and second molds by compressed air. Furthermore, the method for manufacturing a decorative hollow body of the present invention is performed using the apparatus for manufacturing a decorative hollow body of the present invention. A typical apparatus is the invention according to claim 6, wherein a first and a second mold having a molding cavity of a blow molded body, a die head for discharging a parison into the mold, and a An apparatus for manufacturing a blow-molded article having a surface provided with a decorating material provided with a gas blower for blowing a gas, wherein the apparatus is independently provided between the first and second molds that open and close. And has a discharge port for the molten resin raw material for molding the decorating material, and forms a molding cavity for the decorating material between at least one of the first and second molds. It is characterized by comprising a third mold having a molding surface.

[0024] The manufacturing apparatus having the above-described configuration is similar to the third embodiment.
Since the mold is independently driven between the first and second molds, when inserting and removing between the first and second molds, for example, a cylinder or the like simply intersects orthogonally with the opening and closing direction of the molds. It is only necessary to drive in the direction, and the driving mechanism is simplified.
Moreover, when the mold is opened, it is sufficient for the manufacturing apparatus to set the gap between them to be slightly larger than the width of the third mold protruding into the gap. Therefore, the size of the device is reduced.

Further, in the manufacturing apparatus, since the third mold is driven independently, it is possible to change only the third mold. Therefore, when manufacturing various kinds of decorative hollow bodies, only the third mold needs to be changed in addition to the first and second molds.

[0026]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition,
In this embodiment, a door trim of an automobile will be described as an example of a blow molded body.However, the present invention is not limited to this, and for example, interior parts such as a rear luggage trim and a ceiling member of an automobile, the fender protector and the like. The present invention is also applied to exterior parts such as an air spoiler or a seat back in a general living space.

FIG. 1 is a schematic view of a manufacturing apparatus for manufacturing a decorative hollow body by blow molding according to a typical embodiment of the present invention, and FIGS. FIG. 8 is a schematic view showing the state, and FIG. 8 is a perspective view and a sectional view of a door trim which is a decorative hollow body manufactured by the same device.

The apparatus 1 for manufacturing the door trim 20 according to the present embodiment includes first and second dies 2 and 3 having molding cavities 2a and 3a of the door trim 20, and the two dies 2 and 3 are moved toward and away from each other. Horizontal opening and closing. Projections 3b are protruded above and below the molding cavity 3a of the second mold 3.

A die head 4 is disposed immediately above the mold closing position of the dies 2 and 3, and a parison P extruded from the die head 4 is supplied between the dies 2 and 3. Furthermore,
The manufacturing apparatus 1 includes gas blowing means (not shown) for blowing gas into the parison P.

Below the molds 2 and 3, a third mold 6 for decorative molding is arranged on a slide table 7 in the opening and closing direction of the molds 2 and 3. The third mold 6 includes a first rod 8 a that is driven to expand and contract in the vertical direction by a first cylinder 8.
Are mounted on the second and third rods 8b, 8c connected to the connection plate 9 at the tip of the mold, and are inserted and removed between the dies 2, 3 which are open independently of the dies 2, 3. Is done.
The surface of the third mold 6 facing the first mold 2 is the first mold 2.
It has a molding surface 6a having substantially the same shape as the molding cavity 2a of the mold 2, and a decorative material molding cavity is formed between the molding surface 6a and the molding cavity 2a of the first mold 2. . Projections 6b are protruded above and below the molding surface 6a.

The third mold 6 is provided with a sprue or hot runner (not shown), and a resin gate 6c communicates with the molding surface 6a from the sprue (not shown) via a hot runner. A shut-off mechanism (not shown) is attached to the resin gate 6c. The injection device 12 that moves toward and away from the third mold 6 is connected via a hot runner, and a molten resin material for molding the decorating material is molded into the third mold 6. The surface 6a and the first mold 2
To the mold cavity 2a. The supply of the molten resin raw material is performed from the injection device 12 itself or a blower or the like.

The slide table 7 is slidable on rails 11 fixed to the apparatus frame 10 in the opening and closing directions of the dies 2 and 3. The insertion / removal position can be finely adjusted.

In the manufacturing apparatus 1 having such a configuration, since the third mold 6 is driven independently of the molds 2 and 3,
The third mold 6 need only be driven vertically by the first cylinder 8, and the driving mechanism is simple. In addition, the manufacturing apparatus 1 only needs to set the gap dimension between the molds 2 and 3 to a dimension where the third mold 6 can be inserted and removed when the molds 2 and 3 are opened, and does not require a large space.
The device becomes smaller.

In the manufacturing apparatus 1, since the third mold 6 has the cylinder 8 for driving and is driven independently of the molds 2 and 3, only the third mold 6 is used. Changes can be made. Therefore, when many kinds of decorative materials are formed in advance, only the third mold 6 may be changed,
Even when molding various kinds of decorative hollow bodies, the mold 2,
In addition to the above, only the third mold 6 needs to be changed, which makes it possible to deal with the cost at a low cost. Hereinafter, a method of manufacturing the door trim 20 shown in FIG. 8 using the manufacturing apparatus 1 will be described with reference to FIG.
This will be described with reference to FIGS.

The door trim 20 is a hollow molded body of polypropylene, and a resin sheet material of, for example, polypropylene is provided as a decorative material S on the surface thereof. In addition, as a material of the door trim 20, a thermoplastic resin such as polyethylene, ABS, mPPO, PC, and TPE can be used. Further, as the decorative material S, woven or knitted fabric, nonwoven fabric, polypropylene, polyethylene,
ABS, PC, TPE or other single-layer structure, or woven or knitted fabric, non-woven fabric, plain woven fabric, knitted fabric, etc., TPO sheet or PV
A two-layer structure with a C sheet backing is suitable.

A resin sheet material S1 made of polypropylene on the surface
In order to manufacture the door trim 20 on which the decorative sheet material is applied, first, the first and second molds 2 and 3 are opened. The opening position of the dies 2 and 3 is referred to as a first position A.
In this state, the first cylinder 8 is operated to contract the first rod 8a, so that the second and third rods 8b and 8c are raised and lowered, and the third mold 6 is moved to the mold. Insert between gaps 2 and 3 (FIG. 2). Thereafter, the molds 2 and 3 are moved from the first position A in the mold closing direction, and a slight gap is formed between each of the parting lines between the third mold 6 and the first mold 2 as shown in FIG. Is stopped at the position where the third mold 6 is provided, and a molten resin material for decorative material molding is supplied from the resin gate 6c of the third mold 6. The molten resin raw material is put in a small amount so as not to fill the decorative material molding cavity formed between the molding surface 6a of the third mold 6 and the molding cavity 2a of the first mold 2.

Next, the first and second molds 2 and 3 and the third mold 6 are clamped (FIG. 4), and the molten resin material for forming the decorative material is compressed to form the resin. The sheet material S1 is formed into a shape along the forming cavity 2a. The positions of the dies 2 and 3 at this time are referred to as a second position B.

The movement of the dies 2 and 3 during the molding is such that the projection 3b of the second die 3 comes into contact with the third die 6 and the projection 6b of the third die 6 It is regulated by contacting the molding cavity 2a of one mold 2. In the illustrated example, the movement of the dies 2 and 3 in the mold closing direction is restricted at a position where a slight gap is provided between the molding surface 6a of the third mold 6 and the molding cavity 2a. Thus, the protrusion dimensions of the protrusions 3b and 6b are set. The protrusion 3
The protrusion dimensions of b and 6b are set according to the molding method, the material and thickness of the decorative material S, and the like.
By making the protrusion size of 6b changeable, it is possible to provide the manufacturing apparatus 1 that can cope with various decorative materials S.

When the molding of the resin sheet material S1 is completed, the first and second molds 2 and 3 are moved again to the first position A and opened as shown in FIG. The first cylinder 8 of the third mold 6 is extended to extend the first rod 8
a, and the second and third rods 8b, 8c
The third mold 6 is retracted from between the molds 2 and 3 via.

Thereafter, as shown in FIG. 6, a parison P is supplied from the die head 4 between the first and second molds 2 and 3, and the first and second molds 2 and 3 are closed. .
The mold position at the time of this molding is referred to as a third position C. In closing the mold, both the first and second molds 2 and 3 are movable with respect to each other, so that the positioning is facilitated.

Thereafter, as shown in FIG. 7, blow molding is performed. However, since the sheet material S1 is preliminarily molded along the molding cavity 2a of the first mold 2, the parison P
The parison P expands smoothly and uniformly along each of the molding cavities 2a and 3a without disturbing the expansion of the sheet material S, and the sheet material S1 is attached to the surface thereof.
The door trim 20 shown in FIG. 8 is formed.

Since the third mold 6 is independently inserted and removed between the molds 2 and 3 only by moving up and down, the open / close position of the molds 2 and 3 is set to the first position as described above. The third position A, B, C is sufficient, the control drive is simplified as compared with the conventional one, and the number of movements of the dies 2, 3 is reduced, so that the manufacturing efficiency is remarkably improved. I do. FIG. 9 shows a modification of the third mold used in the manufacturing apparatus of the present invention. In the above embodiment, a molding surface 6a having substantially the same shape as the molding cavity 2a of the first mold 2 is provided on the surface of the third mold 6 facing the first mold 2.
In this embodiment, the molding surface having substantially the same shape as the molding cavity 3a of the second mold 3 is also provided on the surface of the third mold 6 facing the second mold 3 in this embodiment. 6d. In the illustrated example, members that are substantially the same as those in the above embodiment are given the same member names and reference numerals. Therefore, a detailed description of these members will be omitted.

As shown in FIG. 9, a sprue or a hot runner (not shown) is provided on the third mold 6, and resin gates 6c and 6e are formed from the sprue and the hot runner toward the molding surfaces 6a and 6d. Each is provided. The third
Molding surfaces 6a and 6d forming molding cavities for the decorating material S between the first and second molds 2 and 3 on both sides of the mold 6.
Therefore, for example, it is possible to decorate the same kind of decorating material S on the entire circumference or a part of the hollow body, or to decorate different kinds of decorating materials S with each other. Can be provided.

FIG. 10 shows the manufacturing apparatus 1 for forming a two-layer decorative material S2 in which a TPO sheet or a PVC sheet is backed on a woven or knitted fabric, a nonwoven fabric, a plain woven fabric, or a knitted fabric.
FIG. 3 is an explanatory diagram for explaining the processing step, and includes a sheet material supply unit (not shown) for supplying a decorative material S2 such as cloth inside the first mold 2. The first mold 2 includes a vacuum suction pipe 2b communicating with the molding cavity 2a.

It is appropriate that the decorating material S2 be extensible at normal temperature or overheating. When the decorating material S2 is difficult to stretch or when there is a possibility that the appearance may be damaged due to the stretching, for example, to facilitate the stretching of the decorating material S2,
Below the molds 2 and 3, a heater for heating a sheet material (not shown) is arranged on the slide table 7 on the side of the first mold 2, and is arranged in the opening and closing direction of the molds 2 and 3. You. A heater (not shown) is installed at the tip of a rod that is driven to expand and contract in the vertical direction by a second cylinder (not shown), and the heater is inserted and removed between the molds 2 and 3 that are independently opened. Is done. In addition, without providing the sheet material supply unit,
It is also possible to supply the decorating material S2 manually.

As described above, the movement of the dies 2 and 3 in the mold closing direction is restricted at a position where a slight gap is provided between the third die 6 and the molding cavity 2a. The protrusion dimensions of the protrusions 3b and 6b are set. Therefore, for example, when a raised cloth is used as the decorating material S2, it is possible to avoid such a problem that the raised cloth is excessively crushed by the mold 6 and the mold 2 and the hair falls.

After the first and second molds 2 and 3 are opened, the decorating material S2 is softened by heating, and the molding surface 6a of the third mold 6 and the first mold are opened. And the second mold cavity 2a, the third mold 6 and the first mold 2 are clamped, and air is evacuated from a not-shown compressed air pipe of the third mold 6, or The decorative material S2 is previously formed into a shape substantially along the molding cavity 2a by vacuum suction from the vacuum suction pipe 2b of the first mold 2. Or the first and second molds 2,
3 and the third mold 6 are clamped (FIG. 4), and the molten resin raw material for molding the decorative material is compressed, and at the same time, the decorative material S2 is molded into a shape along the molding cavity 2a. .

Thereafter, blow molding is performed. Since the decorative material S2 is formed in advance along the molding cavity 2a of the first mold 2, the parison P does not hinder the expansion of the parison P, and the parison P smoothly moves along the molding cavity 2a. And expands uniformly, and the surface of the decorative material S
The door trim 20 shown in FIG.

According to the manufacturing method and the manufacturing apparatus of the present invention,
The first and second molds 2 and 3 and the third mold 6 are provided so that they can be driven independently of each other, and the third mold 6 is moved up and down only to move between the molds 2 and 3. And the third mold 6 is opposed to the first and second molds 2 and 3 so that the first and second molds 2 and 3 are moved in directions other than the opening / closing operation direction. No need to move. Therefore, the three positions of the first to third positions A, B, and C are sufficient as described above for the movement positions of the dies 2 and 3, and the control driving thereof is simplified as compared with the related art. Since the number of movements of the dies 2 and 3 is reduced, the manufacturing efficiency is significantly improved.

According to the present invention, since the decorating material S is formed in advance and arranged in the mold, and does not hinder the expansion of the parison P, a local thin portion is generated. And a decorative hollow body having a substantially uniform thickness can be obtained. Also,
The decorative material S is provided without wrinkles, and has excellent appearance.

In this embodiment, the first and second molds 2 and 3 are moved toward the third mold 6 to mold the material S in advance. The decorating material S can be formed by moving only the mold 6 or by moving the third mold 6 and the first mold 2. In these cases, as shown in FIG. 10, a bracket 13 is provided at the end of the slide table 7 on which the third mold 6 is installed, and a third cylinder 14 that expands and contracts in the horizontal direction is provided on the bracket 13. The third mold 14 can be moved toward the first and second molds 2 and 3 by moving the slide table 7 in the horizontal direction by the third cylinder 14.

[Brief description of the drawings]

FIG. 1 is a schematic view of a manufacturing apparatus for manufacturing a decorative hollow body by blow molding, which is a typical embodiment of the present invention.

FIG. 2 is a schematic view of the manufacturing apparatus immediately before molding of a decorative material.

FIG. 3 is a schematic view of the manufacturing apparatus in a state where a decorative material is being formed.

FIG. 4 is a schematic view of the manufacturing apparatus in a state where a decorative material is being formed.

FIG. 5 is a schematic view of the manufacturing apparatus after a decorative material is formed.

FIG. 6 is a schematic view of the manufacturing apparatus immediately before blow molding a decorative hollow body.

FIG. 7 is a schematic view of the manufacturing apparatus in a state where a decorative hollow body is being blow-molded.

FIG. 8 is a perspective view and a sectional view of a door trim which is a decorative hollow body manufactured by the apparatus.

FIG. 9 is a schematic diagram of a manufacturing apparatus according to a modification of the manufacturing apparatus of the present invention.

FIG. 10 is a schematic diagram of the manufacturing apparatus immediately before molding of a decorative material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorating hollow body manufacturing apparatus 2 First mold 2a Mold cavity 2b Vacuum suction pipe 3 Second mold 3a Mold cavity 3b Projection 4 Die head 6 Third mold 6a Mold surface 6b Projection 6c Resin gate 7 Slide table 8 First Cylinder 8a 1st rod 8b 2nd rod 8c 3rd rod 9 Connecting plate 10 Device frame 11 Rail 12 Injection device 13 Bracket 14 Third cylinder 20 Door trim P Parison S Decorating material S1 Resin sheet material S2 Decorating material of two-layer structure

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29C 51/10 B29C 51/10 B60K 37/00 B60K 37/00 G // B29L 9:00 31:58 F Term (Reference) 3D044 BA11 BC02 4F202 AG07 AG21 AH25 AM32 CA09 CA11 CA15 CB01 CC01 CK42 CK52 4F204 AG07 AG21 AH25 AM32 FA01 FB01 FB19 FG07 FQ11 FW41 4F208 AG07 AG21 AH25 AM32 LA01 LB01 LB19 LD04 LGN LG32 L

Claims (6)

[Claims] 1. A method of manufacturing a decorative hollow body having a surface provided with a decorative material, comprising: opening a first and a second mold having a molding cavity of the blow molded body; Inserting a third mold having a molding surface for decorative material molding between the first and second molds; at least one of the first and second molds and the third mold; And the molten resin material of the decorating material is introduced into a decorating material molding cavity formed between at least one of the first and second molds and the third mold. And forming the decorating material, the mold of at least one of the first and second molds,
Relatively separating from the third mold together with the formed decorative material; retreating the third mold from between the first and second molds; A method for producing a decorative hollow body, comprising: disposing a parison between the molds; and closing and blow-molding the first and second molds. 2. A method of injection-molding a molten resin material of the decorating material into a decorating material molding cavity formed between at least one of the first and second molds and the third mold. The production method according to claim 1, which comprises: 3. A compression molding of a molten resin material of the decorating material into a decorating material molding cavity formed between at least one of the first and second molds and the third mold. The production method according to claim 1, which comprises: 4. A method for manufacturing a decorative hollow body having a surface provided with a decorative material, wherein the first and second hollow members have molding cavities.
Opening the mold; disposing a decorative sheet material inside at least one of the first and second molds; forming a decorative material between the first and second molds; Inserting a third mold having a surface, one of the molds on which the decorative sheet material is arranged, and the third mold are relatively close to each other, and the decorative sheet material and the third mold are relatively close to each other. The molten resin raw material is introduced into the decorative material molding cavity formed between the first and second molds to form a decorative material with a decorative sheet material. Relatively separating from the third mold together with the formed decorative material with the decorating sheet material; retreating the third mold from between the first and second molds; Disposing a parison between the second molds; and closing and blow molding the first and second molds. Method for manufacturing a decorative hollow body characterized by comprising. 5. The manufacturing method according to claim 4, further comprising: bringing the decorative sheet material along a molding cavity of at least one of the first and second molds by vacuum suction and / or air pressure. 6. A first and a second mold having a molding cavity of a blow molded article, a die head for discharging a parison into the mold, and a gas blower for blowing a gas into the parison. A blow molding body manufacturing apparatus having a surface provided with a decorative material attached thereto, wherein the decorative material is independently inserted and removed between the first and second molds that open and close. A third mold having a discharge port for the molten resin material for use, and having a molding surface for forming a molding cavity for the decorative material between at least one of the first and second molds. An apparatus for manufacturing a decorative hollow body, comprising: