JP2000141378A - Mold for partially decorated integrally molded product of skin material, and partial decoration molding method for skin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep quality stably by cleanly arranging a skin material terminal line without requiring a vacuum drawing machinery. SOLUTION: A mold is equipped with a core mold 3 and a cavity mold 5 and a clamp member 4 possible to advance and retreat with respect to the outer periphery of one area covered with a skin material 1 is provided at the core mold 3 and, in such a state that the skin material is interposed between the clamp member 4 and the core mold 3, the clamp body 4 retreats and the peripheral edge part 1a of the skin material 5 is drawn out to the outside of a cavity wall to hold the skin material 1 between the clamp member 4 and the core mold 3 to set the same. A projected part 52 is formed at the cavity mold 5 at the area opposed to the inner peripheral edge of the clamp member 4 in the outer periphery of one area covered with the skin material 1 and a pointed edge part 52a is provided at the leading end of the projected part 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for a decorative integrally molded article, in which a design surface is partially decorated with a skin material in addition to a resin molding surface, and a part of the skin material. The present invention relates to a decorative molding method.

[0002]

2. Description of the Related Art For interior parts of automobiles and the like, there is an integrally molded product in which a texture and a sense of quality are imparted with a skin material in a partial area of a design surface. Such an integrally molded article has conventionally been manufactured by a manufacturing method as shown in FIG. First, a skin material 91 having a predetermined size with its outer periphery trimmed is set in the cavity mold 94, and the skin material 91 is fixed by vacuuming. Next, the mold closing is advanced, and the molten resin 93 is injected during the progress. Then, the mold closing is completed and pressed to produce an integrally molded product Y (FIG. 22). Reference numeral 92 denotes a core type,
Reference numeral 95 indicates a molding resin.

[0003]

However, in the above-described manufacturing method, a dimensional error is apt to occur in the trimming cut of the skin material 91, which immediately affected the quality. In addition, the skin material 9
There was a problem that the deviation occurred even when setting 1 and the terminal line 91a of the skin material in the integrally molded product Y was not constant (solid line and chain line). In addition, equipment for evacuating was required, and the equipment for forming dies became large.

The present invention solves the above-mentioned problems, and does not require a device for evacuating the skin. The terminal line of the skin material can be neatly arranged and the quality can be stably maintained. It is an object to provide a partially decorative molding method.

[0005]

In order to achieve the above object,
The gist of the present invention according to claim 1 includes a core mold and a cavity mold, wherein the core mold is provided with a clamp body that can move forward and backward around an outer periphery of an area covered with a skin material, The clamp body retreats with the skin material interposed between the core mold and the peripheral part of the skin material is pulled out of the cavity wall so that the skin material is set by clamping the clamp body and the core mold. The cavity mold is characterized in that a projection is formed at a position facing the inner peripheral edge of the clamp body around the outer periphery of one area covered with the skin material, and a sharp blade is provided at the tip of the projection. In the mold for the partially decorated integral molded product of the skin material. The gist of the present invention according to claim 2 includes a core mold and a cavity mold, wherein the core mold is provided with a clamp body that can move forward and backward around an outer periphery of an area covered with the skin material, The clamp body retreats with the skin material interposed between the core mold and the peripheral part of the skin material is pulled out of the cavity wall so that the skin material is set by clamping the clamp body and the core mold, and The clamp body is provided with a blade part protruding from the upper end of the inner peripheral edge, and is a mold for a partially decorated integral molded product of a skin material. The gist of the present invention described in claim 3 is to use the mold for a partially-decorated integrated molded product according to claim 1 or 2 so as to cover one region of the core mold with the skin material and to cover the periphery of the skin material. Pulled out of the cavity wall and clamped between the clamp body and the core mold, then inject molten resin from the gate in the inner area covered with the skin material to the cavity,
With the filling of the molten resin, the skin material is pressed with the pressure of the molten resin so that the blade portion cuts the skin material, and is integrally molded with the skin material, and is partially decorated with the skin material. In the way.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a mold for a partially decorated integrally molded product of a skin material and a method of partially decorated molding of a skin material according to the present invention will be described in detail. (1) Embodiment 1 FIGS. 1 to 12 show an embodiment of a mold for a partially decorated integral molded article of a skin material and a method of partially decorated molding a skin material according to the present invention.
7 are cross-sectional explanatory views showing a molding process, FIG. 1 is a cross-sectional explanatory view of a mold for partially decorative molding of a skin material in an open state (hereinafter, simply referred to as a “mold”), and FIG. FIG. 3 is a cross-sectional explanatory view in which the process proceeds from the state of 1 and the skin material is locked and set. FIG. 3 is a cross-sectional explanatory view in which molten resin is injected into the cavity from the gate in the inner area covered with the skin material after closing the mold. 4 is FIG.
5 and FIG. 6 are enlarged cross-sectional views in which the process has progressed from the state of FIG. 4, FIG. 7 is a cross-sectional explanatory view in which a molten resin is injected into a cavity from a gate disposed in an outer region of the skin material, 8 is a cross-sectional explanatory view of the mold release, FIG. 9 is a plan view of the core mold and the clamp body of FIG. 1, FIG. 10 is a perspective view of a partially decorated integral molded product of a skin material, and FIG. 11 is IV-IV of FIG. Line sectional view, FIG.
2 is an enlarged view of a portion B in FIG.

Mold for Partially Decorated Integrated Molded Product of Skin Material A mold for producing a partially decorated integrated molded product of skin material will be described. The mold illustrated in FIG. 1 is an example of a mold used for a partially decorated integral molded product of a skin material, and includes a core mold 3, a clamp body 4, and a cavity mold 5.

Here, the core mold 3 is a fixed mold (lower mold) having a core mold projection 3a substantially at the center. Although the cavity wall 31 is formed in the core mold 3, a part of the cavity wall outside the region where the skin material 1 is arranged is supported by the clamp body 4 (FIG. 2). Therefore, a recess 36 for holding the clamp body 4 is secured on the core mold. Gates 32 and 33 for injecting the molten resins G _2a and G _2b are formed in the core mold 3 on both the inner area (encapsulated area) covered by the skin material 1 and the cavity wall in the outer area of the skin material 1 ( 3 and 4).

The clamp body 4 is provided along the outer peripheral edge of the core-shaped projection 3a (one area) covered with the skin material 1. The clamp body 4 includes a core-shaped convex portion 3 on which the skin material 1 is disposed.
A portion a is an annular block having an opening O (FIG. 9), which is installed on the core mold side, and forms the core mold cavity wall 41 on the upper surface of the clamp body as described above. The lower surface of the clamp body 4 is supported by the movable shaft 71 (see FIG. 8), and the clamp body 4 floats from the core mold 3, comes into close contact with the core mold 3, and moves forward and backward by a hydraulic cylinder (not shown) for operating the movable shaft. It is provided as possible. Under the condition that the clamp body 4 is pulled down to the core mold 3, the inner peripheral edge 49 of the clamp body 4 and the core mold convex outer peripheral edge 39 are in close proximity over the entire circumference (FIG. 9). Therefore, after the clamp body 4 is floated, the skin material 1 is interposed between the core mold 3 and the clamp body 4 and the clamp body 4 is lowered, so that the skin material 1 is The skin material 1 is arranged on the pinch and the core-shaped convex portion 3a, and can be locked and set. Core type 3
When the skin material 1 is locked and set with the clamp body 4, the portion of the clamp body 4 that is in contact with the skin material 1 is the joint portion 42, which surrounds the inner peripheral edge 49 of the clamp body with a predetermined width. The joining portion 42 corresponds to the formation of the groove 7 of the product P (see FIG. 12), and the other cavity wall 4 of the clamp body 4
It will be one step lower than 1.

The cavity mold 5 has a cavity wall 51 on the lower surface.
Are formed on the movable die (upper die). Cavity mold 5
Are clamp bodies 4 around one area covered with the skin material 1.
A projection 52 is formed at a portion facing the inner peripheral edge 49 of FIG. More specifically, a portion of the clamp body 4 that faces the joint portion 42 that sandwiches the skin material 1 protrudes downward to form a projection 52. The protruding portion 52 is formed in an annular shape, and forms a groove 7 at the boundary between the skin material 1 and the resin surface on the design surface of the completed integrally molded product P. At the tip of the projection 52, a sharp blade 52a is provided. Both side walls of the protruding portion 52 draw a gentle arc from the cavity wall 51 to reduce its width, and a blade portion 52a is formed at the lower end of the protruding portion (FIG. 2). In the molding process, when the pressure of the first molten resin G2a increases,
The portion of the skin material 1 in contact with the blade 52a is positively cut to improve the appearance of the finished product. In the present embodiment, the blade portion 52a forms a blade edge whose side in contact with the skin material 1 is raised. Alternatively, the blade portion 52a may have a blade edge as shown in FIGS. 13 and 14. After the skin material 1 is interposed between the clamp body 4 and the core mold 3 and the clamp body 4 is drawn into the core mold 3 and the skin material 1 is sandwiched, the cavity mold 5 is lowered and the mold is closed. The cavity C for the partially decorated integrated molded product is formed.
At this time, the skin material 1 traverses the cavity C along the side wall of the protruding portion 52 to form the transverse portion 1b while forming the peripheral portion 1b.
a is sandwiched between the clamp body 4 and the core mold 3,
a is in contact with the upper edge of the transverse portion 1b of the skin material 1.

A method for partially decorating a skin material Using the above-described mold, a method for partially decorating a skin material is carried out as follows. First, prior to the forming operation, a plate-shaped skin material 1 cut and cut into a predetermined size is prepared. After the skin material 1 is formed as an integral molded product P, the peripheral portion 1a thereof is formed.
Is not required, and it is not necessary to cut severe dimensions as in the prior art shown in FIG. A skin material 1 slightly larger than a skin material of a predetermined size to be a product is prepared. Skin material 1
For example, a fabric skin material or a resin leather skin material (sometimes lined) which is vacuum-molded and trimmed is used.
Then, the mold is opened, the clamp body 4 is further moved upward, and the clamp body 4 is brought up from the core mold 3.

Next, the skin material 1 is disposed between the core mold 3 and the clamp body 4 (FIG. 1). Subsequently, a hydraulic cylinder (not shown) is actuated to pull the clamp body 4 toward the core mold, thereby locking the skin material 1 on the core mold (FIG. 2). When setting the skin material 1 in the cavity C for forming the partially decorated integral molded product P of the skin material 1, the protrusion 3 a (one region) of the core mold 3 is covered with the skin material 1 so as to cover the surface material 1. The peripheral portion 1a is pulled out of the cavity wall 31 and clamped and set between the clamp body 4 and the core mold 3. The skin material 1 covers the core-shaped convex portion 3a, and the skin material peripheral portion 1a is pulled out of the cavity wall (specifically, the gap between the core-shaped convex portion 3a and the clamp body 4), and is locked and set. . When the clamp body 4 descends and comes into close contact with the core mold 3, the core mold projection 3
The outer peripheral edge 39a of FIG. 4A and the inner peripheral edge 49 of the clamp body 4 sandwich the skin peripheral edge 1a (see FIG. 4). The core material 3 and the clamp body 4 hold the entire periphery of the skin material 1. Thus, the skin material 1 is set so as to cover the core-shaped projection 3a. The skin material peripheral edge 1a, which has been cut slightly larger, is stored in a space formed below the clamp body.

Thereafter, mold closing is advanced. When the cavity mold 5 is closed, the skin material 1 partially occupies the region in the cavity, and the skin material 1 is locked and set on the core mold 3 and the clamp body 4.

Next, the gate 32 in the inner area covered with the skin material 1 is opened, and the molten resin G _2a is injected from the gate 32 into the cavity C through the passage 34 (FIG. 3), and the partial decoration is performed. An integral molding with the skin material 1 is performed. It is very difficult to fill the cavity C with the molten resin G _2a without any excess or shortage. Therefore, the molten resin G _2a is supplied a little extra here. As the injection progresses of the molten resin G _2a into the cavity C of the inner region covered with the skin material 1, the molten resin G _2a is filled in the inner region cavity C (FIG. 4), the skin material 1 melted resin G
It will be pressed with _2a . By this pressing, the skin material 1 comes into close contact with the cavity wall 51 and is shaped into the shape,
Pressing of the molten resin G _2a in cross section 1b, the skin material 1 by injection progresses further molten resin G _2a is go N Rise toward the outer region (Figure 5). Then, the heat of the molten resin G _2a is also applied, and the skin material 1 is formed at the blade portion 52a of the protrusion 52.
Is cut neatly. Is cut in the upper edge of the transverse section 1b, the molten resin G _2a flows out to the outer region of the skin material 1 (FIG. 6).

Here, in the case as shown in FIG. 18 where the blade portion 52a is not provided, the crossing portion 1b is forcibly stretched and torn, so that the way of the breaking is irregular. For example, FIG.
As shown in FIG. 9, the skin material terminal 1 f appears on the design surface side over the groove portion 7, or the hairs and a part of the skin material 1 are torn off and the scraps are mixed in the molten resin. As a result, in the finished product, the skin material terminal line L is disturbed, and scraps of the skin material appear on the design surface, and the appearance is deteriorated. In the present invention, by providing the blade portion 52a, since the skin material 1 is cut off at the point of the blade portion 52a, the skin material terminal line L is not disturbed. There are no scraps from the skin material 1. Note that it is not necessary to cut the entire skin material 1 at the blade portion 52a, and the blade portion 52a
It is not necessary to provide the entire area. At the blade portion 52a of a portion of the projecting portion 52, the skin member 1 with the filling of the molten resin G _2a
It is enough if it can be cut. As the material of the molten resin G, for example, a thermoplastic plastic such as polyethylene or polypropylene is used. Molten resin G ( _G2a , _G2b )
Is preferably compatible with the skin material 1 for partial decoration.

Thereafter, the gate 33 disposed in the outer region of the skin material 1 is opened, and the molten resin G _2b is injected from the gate 33 into the cavity C through the passage 35 (FIG. 7). The molten resin G filled in the cavity C in the outer region of the skin material 1
_2b fills the cavity C, joins it to the skin material 1, and integrates it. Breaking the aforementioned cross section 1b, the molten resin G _2a
Is discharged to the outer region of the skin material 1, the molten resin G _2b or the first resin layer 2a where the molten resin G 2a has been cured is joined to the molten resin G _2b (finally, the second resin layer 2b) to form an integrated body. (See FIG. 12). Thus, the remaining cavity C outside the skin material is completely filled with the molten resin G _2b , and the skin material 1 is formed.
Thus, an integrally molded product P partially decorated is obtained.

The partially decorated integral molded product P of the skin material 1 thus formed is cooled and solidified, and then proceeds to a demolding step. The integrally molded product P is pushed up by the clamp body 4 and an ejector pin (not shown), and is released from the mold (FIG. 8). After taking out the integral molded product P from the mold, finally, the operator removes the skin material peripheral portion 1a extending from the rear surface of the molded product by hand, scissors, or the like to obtain a desired skin material portion as shown in FIGS. A decorative integrated molded product P is obtained. The gate land portion 23 on the back surface side of the integrally molded product P is also appropriately cut.

In the step of injecting the molten resin G _2a , in order to improve the integral molding state of the skin material 1, it is possible to adopt a low pressure molding method in which a mold is slightly opened and adjusted. . In such a case, the molten resin G _2a is piled up on the core-shaped protrusion 3a. After finishing injection of molten resin G _2a ,
Completely closing the cavity 5 that was a little opening degree, becomes to complete the mold closing, in this process, the molten resin G _2a which piled bunching is pressed. The skin material 1 is pressed against the cavity wall of the cavity mold 5 by the filled molten resin G _2a , and the skin material portion forming the design surface E is formed neatly. At the same time, the molten resin G _2a fills the area covered with the skin material 1 and tries to forcibly break the transverse portion 1b in search of a place to go, but the blade portion 52a cuts the upper edge of the transverse portion 1b and melts smoothly. It would be to create a place to go of resin G _2a.

The partially decorative integrally molded product of the skin material 1 obtained by the above-described integral molding method has a shape as shown in FIGS. In the integrally molded product P with the skin material 1, the design surface E has an island shape in addition to the design surface formed by the resin layer 2b, and is partially decorated (FIG. 9). On the design surface E, the terminal line L of the skin material 1 is neatly set in the groove 7. The peripheral edge portion 1a of the skin material is provided on the back side of the integrally molded product P at the stage when the molding is completed.
However, in FIG. 12, the portion is trimmed and cut to form a cut portion 1c. The skin material 1 forms a part of the design surface E by adopting the molding method, and the peripheral edge portion 1a penetrates the resin layer 2 from the design surface side to the back surface side (FIG. 11). Then, a part of the transverse portion 1b where the skin material 1 crosses the resin layer 2 is cut into the blade portion 52a, and the first resin layer 2a flows out to the outer region of the skin material 1 beyond the transverse portion 1b. The cross section 1b looks like the skin material 1 is cut cleanly at the blade section 52a (FIG. 12).

In this embodiment, the island-shaped partially decorated integrally molded article P as shown in FIG. 10 is sandwiched between the core mold 3 and the clamp body 4 over the entire outer periphery of the skin material. For example, a partially decorated integrated molded product P as shown in FIG.
It can also be.

Effects According to the partially decorated integral molding of the skin material and the partially decorated molding method of the skin material configured as described above, the skin material peripheral portion 1a is provided.
Is drawn out of the cavity wall, and is always locked and set at a predetermined position by the core mold 3 and the clamp body 4, so that the skin material terminal line L appearing on the design surface side is uniformly and finely finished. Further, in the step of supplying the molten resin G _2a to the portion covered with the skin material 1 and performing integral molding with the skin material 1, the molten resin G _2a cuts the skin material 1 with the blade 52a. since the blade portion 52a is pressure also cut skin material 1 by utilizing the heat of the molten resin G _2a, skin material terminal clean. The portion where the skin material 1 is cut is the blade portion 5
2a is the upper edge of the cross section 1b and the skin material edge 1
Since g is set in the groove 7, the edge 1g of the skin material does not protrude to the design surface, so that it is not bad. Skin material terminal line L
But clean and good looking. Even if the cut edge 1e of the outer skin material appears in the appearance as shown in FIG. 6, there is no problem since it is on the back side of the product. Further, when the skin material 1 is forcibly broken, the hair or a part of the skin material 1 is removed to adversely affect the design appearance, but there is no such a problem. When the skin material 1 is formed into an integrally molded product P, the skin material peripheral portion 1a appears on the back surface of the molded product. However, since this portion is an unnecessary portion and is cut, the skin material 1 at the time of molding has a predetermined size. It is sufficient to use a slightly larger one, so that cutting is not severe. In addition, since the skin material 1 can be locked and set on the core mold by the core mold 3 and the clamp body 4, the conventionally required vacuuming equipment is not required. Skin material 1
The mold is opened slightly to adjust the cavity C
When the low-pressure molding method of injecting the molten resin G into the plastic material and further pressing is used, there is an advantage that damage to the skin material 1 is reduced.

(2) Embodiment 2 In the mold of this embodiment, instead of providing the blade 52a in the cavity mold 5 of Embodiment 1, a blade 42c is formed in the clamp body 4 as shown in FIG. is there. At the upper end of the inner peripheral edge 49 of the clamp body 4, a blade portion 42c protruding toward the outer peripheral edge 39 of the core mold 3 is provided. Here, the clamp body 4 is sandwiched between the clamp body 4 and the core mold 3 with the skin material 1 interposed therebetween as shown in FIG.
The skin material 1 is set in the core mold 3 by retreating in the white arrow direction of FIG. The clamp body 4 is an annular block as shown in FIG. However, the clamp body 4 of the present embodiment is not one piece but divided into a plurality of pieces. Other configurations are the same as in the first embodiment. The same reference numerals as those in the first embodiment denote the same or corresponding parts. In the method for partially decorating the skin material 1 using this mold, a peripheral portion 1a of the skin material 1 is pulled out of the cavity wall so as to cover one region of the core mold 3 with the skin material 1, and the clamp body is formed. 4 and the core mold 3, and then the molten resin G _2a is injected into the cavity C from the gate 32 in the inner area covered with the skin material 1, and the molten resin G _2a
When the skin material 1 is pressed with the pressure of the molten resin, the blade portion cuts the skin material 1, and the cutting is performed by the blade portion 42c (FIG. 16). Clamp body 4
As another form of forming the blade portion 42c, a blade portion 42d protruding toward the cavity mold 5 at the upper end of the inner peripheral edge 49 of the clamp body 4 as shown in FIG. The mold and the method for partially decorating the skin material thus configured also have the same functions and effects as those of the first embodiment.

It should be noted that the present invention is not limited to the embodiment described above, but can be variously modified within the scope of the present invention depending on the purpose and application. The shape, size, material, number, and the like of the skin material 1, the resin layer 2, the core mold 3, the clamp body 4, the cavity mold 5, and the like can be appropriately selected according to the application.

[0024]

As described above, the partially decorative integral molding of the skin material and the method of partially decorative molding of the skin material of the present invention do not need to be evacuated to the set of the skin material, and the skin appearing on the design surface can be obtained. The material terminal line can be neatly arranged, and it has excellent quality stability.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a mold for partially decorative molding of a skin material in an open state according to a first embodiment.

FIG. 2 is an explanatory cross-sectional view in which a process proceeds from the state of FIG. 1 and a skin material is locked and set;

FIG. 3 is a cross-sectional explanatory view in which a molten resin is injected into a cavity from a gate in an inner region covered with a skin material after a mold is closed.

FIG. 4 is an enlarged view of a portion A in FIG. 3;

FIG. 5 is an enlarged cross-sectional view in which a process has proceeded from the state of FIG. 4;

FIG. 6 is an enlarged cross-sectional view in which a process has proceeded from the state of FIG. 4;

FIG. 7 is a cross-sectional explanatory view in which a molten resin is injected into a cavity from a gate disposed in an outer region of a skin material.

FIG. 8 is an explanatory cross-sectional view of a mold release.

FIG. 9 is a plan view of the core mold and the clamp body of FIG. 1;

FIG. 10 is a perspective view of a partially decorated integral molded product of a skin material.

11 is a sectional view taken along line IV-IV in FIG.

FIG. 12 is an enlarged view of a portion B in FIG. 11;

FIG. 13 is an enlarged view of a mold for a partially decorated integral molded product of a skin material having a blade portion in another mode.

FIG. 14 is an enlarged view of a mold for a partially decorated integral molded product of a skin material having a blade portion of another embodiment.

FIG. 15 is an enlarged view around a blade portion of a mold for a partially decorated integral molded product of a skin material according to the second embodiment.

FIG. 16 is an explanatory cross-sectional view showing a state where the crossing portion of FIG. 15 is cut by a blade.

FIG. 17 is an enlarged view around a blade portion of a mold for a partially decorated integral molded product of a skin material in a different mode from FIG.

FIG. 18 is another view corresponding to FIG. 4;

FIG. 19 is another view corresponding to FIG. 6;

FIG. 20 is a perspective view of a partially decorated integral molded product of a skin material.

FIG. 21 is an explanatory diagram of a conventional technique.

FIG. 22 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Skin material 1a Peripheral part 3 Core type 32 Gate 4 Clamp body 42c Blade part 49 Inner peripheral edge 5 Cavity type 52 Projection part 52a Blade part C cavity E Design surface G _2a , G _2b , G Melt resin P molding (integral molding) )

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // B29L 9:00 F term (reference) 4F202 AD08 AD09 AG23 CA11 CB01 CB16 CB27 CK06 CK35 CK84 CL42 CP06 CQ01 CQ06 4F204 AD08 AD09 AG23 FA01 FB01 FB15 FB25 FF05 FJ10 FJ29 FN04 FN07 FN11 FQ01 FQ15 FQ24 FW23 4F206 AD08 AD09 AG23 JA07 JB15 JB25 JF05 JQ81 JT11 JT21 JW23

Claims (3)

[Claims] 1. A core mold and a cavity mold, wherein the core mold is provided with a clamp body which can move forward and backward around an area covered with a skin material, and a skin is provided between the clamp body and the core mold. The clamp body retreats with the material interposed, pulls the outer edge of the skin material out of the cavity wall so that the skin material is set by clamping the clamp body and the core mold, while the cavity mold is the skin material A projection formed at a portion facing an inner peripheral edge of the clamp body around an outer periphery of one area to be covered, and a sharpened blade portion provided at a tip of the projection; Mold for molded products. 2. A core mold and a cavity mold, wherein the core mold is provided with a clamp body which can move forward and backward around an area covered with a skin material, and a skin is provided between the clamp body and the core mold. The clamp body retreats with the material interposed, the peripheral edge of the skin material is pulled out of the cavity wall, and the skin material is set by clamping the clamp body and the core mold. A mold for a partially decorated integral molded product of a skin material, characterized in that a protruding blade portion is provided at an upper end. 3. A peripheral part of the skin material is drawn out of the cavity wall by using the mold for the partially decorated integrated molded product according to claim 1 or 2 so as to cover one region of the core mold with the skin material. After being clamped between the clamp body and the core mold, the molten resin is injected into the cavity from the gate in the inner area covered with the skin material, and the skin material is pressed by the pressure of the molten resin with the filling of the molten resin. A partially decorative molding method for a skin material, wherein the blade portion cuts the skin material so as to be integrally formed with the skin material.