JP2000141459A - Plastic molded product fitted with skin and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic molded product fitted with a skin good in the appearance of the boundary part of the hollow molded product main body and the skin thereof and having no possibility of the peel of the skin end part thereof and a method for producing the same. SOLUTION: In a plastic molded product 10 fitted with a skin obtained by forming a hollow molded product main body 11 in integral relation to a skin 15 by blow molding to fix the skin 15 to the surface required part of the hollow molded product main body 11, the end part 16 of the skin 15 is bent to the rear side of the skin 15 to be embedded in the resin of the hollow molded product main body 11 to be held and fixed by the resin. The skin 15 is applied in order to enhance the decorative properties and touch of the molded product 10 and comprises a nonwoven fabric, a carpet, a fabric or a plastic film. This skin is partially fixed to the surface required part of the hollow molded product main body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic molded article with a skin and its production.

[0002]

2. Description of the Related Art As interior parts for automobiles such as door trims, those obtained by covering a required portion of the surface of a plastic hollow molded product with a skin made of a carpet, a nonwoven fabric, a fabric or a plastic film are often used. One example of such a plastic molded article with a skin is schematically shown in FIGS. In the figure, reference numeral 80 denotes a plastic molded product with a skin, 81 denotes a hollow molded product main body, and 85 denotes a skin. However, the conventional plastic molded article with a skin 8
In the case 0, a groove 82 having a groove width larger than the thickness of the end 86 of the skin 85 is formed in a predetermined portion of the surface of the hollow molded article main body 81, and the bent end 86 of the skin 85 enters the groove 82. Due to the structure, the gap formed by the groove 82 appears on the outer periphery of the skin 85, so that there is a problem that the appearance of the periphery of the skin 85 is poor. Further, there is a problem that the end portion 86 of the skin 85 is easily peeled off due to the existence of the gap.

[0003] Such a plastic molded article with a skin 8
As shown in FIG. 15, a surface 85 of the blow molds 91 and 95 having a desired product shape is arranged on the mold surface 92, and a die D of an extruder is provided between the blow molds 91 and 95. Then, the parison P is introduced in a molten state, and then the blow molds 91 and 95 are closed and a gas such as air is blown into the parison P to form the skin 85 and the hollow molded article main body 81 integrally. A molding method is frequently used.

In the above manufacturing method, a skin positioning projection 93 is provided on the mold surface 92 of the blow molding die, and the skin 85 is arranged so that the outer surface of the end 86 of the skin 85 follows the inner surface of the positioning projection 93. Since the parison P is arranged on the mold surface surrounded by the positioning projections 93 and is shaped and cooled and solidified in that state, the grooves 82 formed by the positioning projections 93 are formed around the outer skin of the molded product after the mold release. I had to remain.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above points, and has a good appearance at the boundary between the hollow molded article main body and the skin, and there is no fear of peeling of the skin end. It is an object of the present invention to provide a plastic molded article with a method and a method for producing the same.

[0006]

The invention according to claim 1 is
In a plastic molded article with a skin in which the hollow molded article body is blow-molded integrally with the skin and the skin is fixed to a required portion of the surface of the hollow molded article body, the end of the skin is bent to the back side of the skin and the hollow molded article is formed. It is characterized in that it is embedded in the resin of the main body and is clamped and fixed by the resin.

According to a second aspect of the present invention, a skin is arranged on a mold surface of a blow mold, and a gas is blown into a parison introduced between the blow molds to form a hollow molded article body integrally with the skin. By blow molding and then demolding,
In a method of manufacturing a plastic hollow molded article with a skin in which a surface required portion of the hollow molded article body is covered with a skin,
The blow molding die is provided with a positioning protruding member which is capable of moving forward and backward from the die surface on a periphery of a skin arrangement portion of the die surface, and the positioning protruding member protrudes from the die surface and is surrounded by the positioning protruding member. The skin is arranged and held at the skin arrangement portion of the surface, the end of the skin is supported by a positioning projection member, raised from the mold surface, and gas is blown into the parison introduced between the mold surfaces to protrude from the mold surface. The protruding portion of the positioning protruding member and the end of the skin are sandwiched between the surfaces of the parison, and then the positioning protruding member is retracted to at least the mold surface position to blow-mold the hollow molded article body.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing a plastic molded product with a skin according to one embodiment of the present invention.
1 is an AA cross-sectional view of FIG. 1, FIG. 3 is an enlarged cross-sectional view of a main part of the plastic molded article with the skin, and FIG. 4 is a simplified example of a blow mold used when manufacturing the plastic molded article with the skin of FIG. FIG. 5 is a cross-sectional view showing an example of manufacturing a plastic molded article with a skin using the blow mold of FIG. 4 when a parison is introduced. FIG. 6 is a cross-sectional view showing a state where gas is blown into the parison. FIG. 7 is a cross-sectional view showing the same at the time of closing the mold, FIG. 8 is an enlarged cross-sectional view showing the state of the main parts over time from the initial stage of gas blowing into the parison to the completion of the closing, and FIG. FIG. 10 is an enlarged cross-sectional view showing a state of a main part when manufacturing a plastic molded article with a skin according to another example. FIG. 10 is an enlarged cross-sectional view showing a state of a main part when manufacturing a plastic molded article with a skin according to still another example. FIG. 11 shows still another example. Enlarged sectional view showing a state of a main part when more production of skinned plastic article, FIG. 12 is a sectional view showing a time parison introduction when further production of skinned plastic article by another example.

A plastic molded article 10 with a skin shown in FIGS. 1 and 2 relates to one embodiment of the present invention, and has a hollow molded article main body 11 and a skin 15. The plastic molded article 10 with a skin shown in the figure is simply shown for convenience, and the shape of the plastic molded article with a skin of the invention disclosed herein is not limited to the illustrated one.

[0010] The hollow molded article main body 11 is
0, which is a blow-molded plastic hollow body. The shape of the hollow molded article main body 11 is appropriately determined according to the use of the molded article 10.

The outer skin 15 is used to enhance the decorativeness and feel of the molded article 10 and is made of non-woven fabric, carpet, fabric, plastic film or the like. The skin 15 is partially fixed to a required surface of the hollow molded article main body 11.

In the invention disclosed herein, as is better understood from FIG.
Of the hollow molded article main body 11
Is embedded in a resin (Parison), and is clamped and fixed by the resin.

Therefore, no groove is formed between the end 16 of the skin 15 and the peripheral edge 12 of the hollow molded article main body 11, and the appearance of the boundary between the hollow molded article main body 11 and the skin 15 is improved. Further, since the end portion 16 of the skin 15 is sandwiched by the resin of the hollow molded article main body 11, the skin end portion 16 is securely fixed, and there is no possibility of peeling.

Next, the plastic molded article with a skin 1
An example of a manufacturing method of No. 0 will be described. In this example, FIG.
Or a two-part blow mold 31 as shown in FIG.
The plastic molded article 10 with the skin is manufactured by blow molding using 35.

The blow molds 31 and 35 have mold surfaces 32 and 36 having a desired product shape, respectively, and a skin arrangement portion of the mold surface, in this example, the mold surface 32 of the mold 31 shown on the left side in this example. A positioning protruding member 40 is provided on a peripheral edge of the die 33 so as to be able to move forward and backward from the mold surface 32. The positioning protrusions 40 are used to correctly position the skin 15 with respect to the mold surface 32 and raise the end 16 of the skin 15 from the mold surface 32 during blow molding. In this example, the positioning projection member 40 is a known hydraulic cylinder device or the like.
It is connected to an appropriate driving device S via an operating member Sa, and the projection 41 of the positioning projection member 40 advances and retreats with respect to the mold surface 32 as the operating member Sa advances and retreats by the operation of the driving device S. It is configured. The protrusion 4
The maximum projection length L from the mold surface 32 corresponds to the length of the bent end portion 16 of the skin 15, and in this example, is the same as the thickness of the skin 15 (typically, 2 mm to 5 mm). ing.

In this embodiment, a skin suction hole 45 and a suction cup-shaped skin suction recess 46 are provided inside the skin arrangement portion 33 surrounded by the projection 41 of the positioning projection member 40 on the mold surface 32, and a vacuum is provided. By operating a suction device (not shown), the skin 15 is vacuum-suctioned through the skin suction hole 45 and the skin suction recess 46 and held on the mold surface 32. Reference numerals 31a and 35a in the drawings indicate mold matching portions (biting portions) of the molding dies 31, 35.

The blow mold 3 having such a configuration
In the production using the first and the third 35, first, as shown in FIG. 5, the skin 15 is arranged on the mold surface 32 of the blow mold 31 and the tubular parison is extruded in a molten state from the die D of the extruder. P is introduced between the opened blow molds 31 and 35. At this time, the protruding portion 41 of the positioning protruding member 40 is made to protrude from the mold surface 32 so that the mold surface 32 surrounded by the protruding portion 41 of the positioning protruding member 40 is formed.
A skin 1 larger than the skin placement part 33
5 is arranged and held, and the end 16 of the skin 15 is supported by the positioning protrusion 40 and raised from the mold surface 32. In this embodiment, the end 16 of the skin 15 is raised from the mold surface 32 along the inner surface of the projection 41 of the positioning projection 40. As described above, the skin 15 is connected to the skin placement portion 33 of the mold surface 32.
By making it larger, the positioning of the skin 15 with respect to the mold surface 32 can be performed more accurately,
The outer skin 15 is pressed against the inner surface of the projecting portion 41 of the positioning projecting member 40 so that the outer skin 15 does not easily come off the mold surface 32. Further, in this example, after the skin 15 is disposed, the vacuum suction device is operated, and the skin suction hole 45 and the skin suction recess 46 are formed.
Then, the epidermis is sucked through the mold surface and held on the mold surface 32. The skin 15 may be formed into a predetermined skin shape (a shape in which the end is bent to the back side) in advance by vacuum forming or the like, or may be a sheet-like shape that is not formed.

In this embodiment, as described above, the end portion 16 of the skin 15 protrudes from the mold surface 32 and rises from the mold surface 32 along the inner surface of the projection 41 of the positioning projection member 40. End 16 and positioning projection 4
0, but the present invention is not limited to this, and as shown in FIG.
5 is supported by the tip of the protruding portion 41 of the positioning protruding member 40, and the skin 15 is disposed and held so that the skin 15 is gently curved to form a gap q between the skin 15 and the mold surface 32. May be.

The blow molding die 3 of the parison P
After the introduction into the space between 1 and 35, pre-blowing may be performed via a blowing nozzle (not shown) as necessary. By slightly expanding the parison P by this pre-blowing, it is possible to eliminate the constriction at the upper and lower middle portions of the parison P caused by the downward pulling of the parison due to its own weight. Mold surface 32,3
6 makes it possible to better conform.

Next, as shown in FIGS. 6 and 7, the blow molds 31 and 35 are closed, and a blow nozzle (not shown) blows into the parison P introduced between the mold surfaces 32 and 36. The parison P is blown with gas such as compressed air to form the parisons P,
Then, the parison P is brought into close contact with the skin 15 to blow-mold the hollow molded article body 11 integrally with the skin 15. Then, the blow molds 31 and 3
5. Open the mold and release the molded product. The pressure of the gas to be blown during the blow molding is determined in consideration of the material and the like of the parison P. In this example, the pressure is 6 kg / cm ^{2 to} 9 k.
g / cm ² . In addition, the symbol Pn in the figure is a burr (excess portion) protruding from the mold matching surfaces 31a and 35a.

Here, a detailed description will be given of when gas is blown into the parison P (when pre-blowing is performed, when gas is blown after pre-blowing). At the time of the gas blowing, first, as shown in (8A) and (8B) of FIG. 8, the protrusion 41 of the positioning protrusion 40 protruding from the mold surface 32 and the end 16 of the skin 15 on the parison P surface. The parison P is inflated so as to sandwich it.

When the skin 15 is arranged on the mold surface 32, as shown in FIG. 12, the end 16 of the skin 15 is supported by the tip of the projection 41 of the positioning projection 40, and the skin 15 and the mold surface are supported. In the case where a gap q is formed between the skins 32, the skin 15 is shaped along the skin arrangement portion 33 of the mold surface 32 and the inner surface of the projection 41 of the positioning projection member 40 due to the expansion of the parison P. The portion 16 is formed in a bent shape, and the end 16 of the skin 15 is sandwiched between the projection 41 of the positioning projection 40 and the parison P surface.

Next, as shown in FIGS. 8C and 8D, the projecting portion 41 of the positioning projecting member 40 is retracted at least to the position of the mold surface 32, and gas is further blown into the parison P. Due to the retreat of the projecting member 40, a gap G corresponding to the projecting portion 41 of the positioning projecting member 40 is once formed outside the skin end 16. However, the resin near the skin end 16 of the parison P is pressed by the pressure in the parison P, and
The gap G is closed, and the skin end 16 is sandwiched between the surfaces of the parison P. In particular,
The resin Pa inside the skin end portion 16 of the parison P has a small temperature drop due to the heat insulating action of the skin 15 and has high fluidity.
It moves easily outward of the skin end 16 and helps to close the gap G.

Further, as in this example, after the projecting portion 41 of the positioning projecting member 40 is retracted, the distal end surface 4 of the projecting portion 41
When the parison P is inflated and the parison P is inflated, the skin end 16 and the skin peripheral portion of the parison P become the protruding portion 41 when the parison 2 is flush with the projecting edge of the mold surface 32.
Is supported by the peripheral edge of the protruding portion between the front end surface 42 and the mold surface 32, and a step or the like does not occur in the corresponding portion, and the appearance of the boundary between the hollow molded article main body 11 and the skin 15 after molding can be improved. it can.

Further, in the blow molding, if necessary, after the projection 41 of the positioning projection 40 and the end 16 of the skin 15 are sandwiched between the surfaces of the parison P, as in a known two-stage blow molding method. The gas may be blown into the parison P once, the parison P is cooled to a predetermined temperature, and then the gas is blown into the parison P again.

The projection of the positioning projection is not limited to the example shown in FIG. 8, but may be, for example, an inner surface (a surface on the skin side) of the projection 51 of the positioning projection 50 as shown in FIG. A concave surface 52 corresponding to the bent shape of the end portion 16 is provided so as to make the projection 51 thinner, or as shown in FIG.
An inclined surface 62 may be provided on the inner surface (the surface on the skin side) of the zero protrusion 61. Thus, the concave surface 52 is formed on the inner surfaces of the protrusions 51 and 61.
If the inclined surface 62 is provided, the mold surface 32 of the skin 15 described above is provided.
When arranging the positioning projection members 50,
The protrusions 51 and 61 of the mold 60 project from the mold surface 32, and the skin end 16 is formed along the inner surfaces of the protrusions 51 and 61.
And the skin 15 can be reliably arranged and held on the mold surface 32 by the projections 51, 61 of the positioning projections 50, 60. Also,
As shown in FIG. 11, the entire projecting portion 71 of the positioning projecting member 70 projects from the mold surface 32, and the projecting portion 71 is
When retracted to the two positions, the gap o
Sometimes you can do it.

Here, (9A) of FIG. 9 and (10A) of FIG.
A), (11A) of FIG.
The projections 51, 61, 71 of the projections 0, 70 project from the mold surface 32 and are held together with the skin end 16 on the surface of the parison P, and FIG. 9 (9 B), FIG. (11B) of FIG.
This shows a state in which the projections 51, 61, 71 of 0, 60, 70 are retracted to the position of the mold surface 32.

[0028]

As shown and described above, in the plastic molded article with a skin according to the first aspect, the end of the skin is bent to the back side of the skin and embedded in the resin of the hollow molded article main body. Since it is sandwiched and fixed in the groove, no groove appears between the hollow molded article main body and the skin as in the related art, and the boundary portion between the hollow molded article main body and the skin is improved in appearance, and the peeling of the skin end is removed. There is no fear.

According to the manufacturing method of the second aspect,
The plastic molded article with a skin according to claim 1 can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a plastic molded product with a skin according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part of the plastic molded article with a skin.

FIG. 4 is a perspective view schematically showing an example of a blow mold used for producing the plastic molded article with a skin shown in FIG.

FIG. 5 is a cross-sectional view illustrating an example of manufacturing a plastic molded article with a skin using the blow mold of FIG. 4 when a parison is introduced.

FIG. 6 is a cross-sectional view showing when a gas is blown into a parison.

FIG. 7 is a cross-sectional view showing a state at the time of completion of mold closing.

FIG. 8 is an enlarged cross-sectional view showing a state of a main part with time from the initial stage of gas blowing into the parison to the completion of mold closing.

FIG. 9 is an enlarged sectional view showing a state of a main part when a plastic molded article with a skin is manufactured by another example.

FIG. 10 is an enlarged sectional view showing a state of a main part when a plastic molded article with a skin is manufactured according to still another example.

FIG. 11 is an enlarged cross-sectional view showing a state of a main part when a plastic molded article with a skin is manufactured according to still another example.

FIG. 12 is a cross-sectional view showing a state where a parison is introduced when a plastic molded article with a skin is manufactured according to still another example.

FIG. 13 is a perspective view schematically showing a conventional plastic molded product with a skin.

FIG. 14 is a sectional view taken along line BB of FIG.

FIG. 15 is a cross-sectional view showing the plastic molded article with the skin at the time of production.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Plastic molded article with a skin 11 Hollow molded article main body 15 Skin 16 End part of a skin 31, 35 Blow mold 32, 36 Mold surface 33 Skin arrangement part 40, 50, 60, 70 Positioning projection member 41, 51, 61, 71 Projection of positioning protruding member P Parison

Continued on the front page F term (reference) 4F202 AD05 AD08 AD26 AG03 AG07 AH55 CA15 CB01 CB16 CK25 CQ01 CQ07 4F208 AD05 AD08 AD25 AG03 AG07 AH55 LA01 LA05 LB01 LB13 LG22 LH18 LJ22 LJ29

Claims (2)

[Claims] 1. A plastic molded article with a skin in which a hollow molded article main body is blow-molded integrally with a skin and the skin is fixed to a required portion of the surface of the hollow molded article body, wherein an end of the skin is bent to the back of the skin. A plastic molded product with a skin, wherein the plastic molded product is embedded in a resin of a hollow molded product main body, and is held and fixed by the resin. 2. A skin is arranged on a surface of a blow mold, and a gas is blown into a parison introduced between the blow molds to blow-mold a hollow molded article body integrally with the skin, and then demolded. By this, in a method of manufacturing a plastic hollow molded article with a skin in which a surface required portion of the hollow molded article body is covered with a skin, the blow molding die includes, from the mold surface, a periphery of a skin arrangement portion of the mold surface. A positioning projection member is provided which can be moved forward and backward, and the positioning projection member is projected from the mold surface, and the skin is arranged and held on the skin arrangement portion of the mold surface surrounded by the positioning projection member, and the end of the skin is positioned and projected. The protrusion of the positioning projection member and the end of the skin that are raised by the member and raised from the mold surface and blown into the parison introduced between the mold surfaces and project from the mold surface are sandwiched between the surfaces of the parison. I The method skinned plastic article, which comprises blow-molding a hollow molding body is retracted at least until the mold surface positioning the positioning projection members.