JPH08183058A - Mold for laminated moldings and molding method - Google Patents

Abstract

PURPOSE: To provide a mold for laminated moldings and a molding method, capable of efficiently performing molding to make laminated moldings of various shapes. CONSTITUTION: A mold is divided into a male mold 10 and a female mold 20, and a two-bladed collar 15 whose edges 16, 18 on both sides are formed into a blade shape, respectively, is provided on the outer peripheral face 14 of the male mold 10. The edge 18 is used as a blade for stripping a cushioning layer 32 of a skin surface material 30, and the edge 16 is used as a blade for shearing the skin surface material 30 with the aid of an edge 25 of a step portion 24 provided on the inner peripheral face 23 of the female mold 20. By means of the step portion 24 of the female mold 20, a gap 26 is defined between the peripheral face 15A of the collar 15 and the inner peripheral face 23, and tension is suitably given to the skin surface material 30 held in the gap 26. Under this condition, when the edges 16, 25 shear the skin surface material 30, no wrinkles occurs. In the case where the skin surface material 30 has the cushioning layer 32, the cushioning layer 32 is stripped by the edge 18 from the skin surface material 30, which is pushed by molten resin and led into the female mold 20 at the time of molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for a laminated molded article and a molding method, and can be used for producing a laminated molded article having a skin surface material on the surface of an automobile interior article or the like.

[0002]

BACKGROUND ART Conventionally, in order to give a good feel to an automobile interior part or the like, or to secure the safety of passengers, it has been provided with useful characteristics such as a brushing property and a cushioning property of the surface. A laminated molded product having a surface coated with a skin surface material is used. Such a laminated molded article can be manufactured by a molding method such as injection molding such as injection compression molding or injection press molding and flow stamping molding. Specifically, a skin surface material is previously arranged in a mold, It can be manufactured by filling a molten resin inside the mold in which the skin surface material is arranged.

[0003]

However, in general molding methods such as injection compression molding, injection press molding, and flow stamping molding, when the skin surface material and the resin are integrally molded, the skin is removed from the periphery of the molded product. Since the surplus part of the face material is exposed, post-processing such as trimming work to cut off this surplus part and folding back the surplus part inconspicuously is necessary after molding, and this post-processing is the manufacturing of laminated molded products. There is a problem of hindering efficiency. Also,
When setting the molded product on the trimming machine that cuts the surplus part of the surface material, the molded product and the trimming machine are easily misaligned, and if they are misaligned, the molded product will be damaged. There is a problem that the production efficiency of

On the other hand, a mold divided into a male mold and a female mold is used, and the mold having the skin surface material is clamped to cut the surplus portion of the skin surface material, and the above-mentioned post-treatment is carried out. A molding method that does not require processing is known. For example, in Japanese Patent Laid-Open No. 61-135716, a mold divided into a male mold and a female mold that fits with almost no gap is used, and the outer peripheral edge of the male mold and the female mold are clamped during mold clamping. A molding method is disclosed in which a skin surface material is sandwiched between and at the inner peripheral edge and sheared. Further, in Japanese Patent Laid-Open No. 04-35917, abutting blades and their pedestals along the outer peripheral edge of the molded product are provided on each of the mating surfaces of the male and female dies, and the abutting blades are used during mold clamping. A forming method is shown in which an excessive portion of the skin material is cut with a blade. However, in these molding methods, when trying to mold a flat plate-shaped molded product, the skin surface material is cut immediately after the mold clamping is started, so that the peripheral portion of the skin surface material moves inside the mold. It is free, no tension is applied to the skin surface material, and wrinkles occur in the skin surface material due to the filling of the molten resin, and good molding cannot be performed. Therefore, the shape of the molded product is limited to a shape in which the skin surface material can be cut immediately before the completion of the mold clamping, that is, a shape having a side wall portion which is bent into an L shape along the outer peripheral edge thereof. A plate-shaped molded product cannot be molded, and there is a problem that the shape that can be molded is limited to a narrow range. In each of the above-described molding methods, since the skin surface material is simply cut along the outer peripheral edge of the molded product, the skin surface material is a laminated structure including a thin skin layer and a thick cushion layer having cushioning properties. If the surface material is a structure, the cushion layer is exposed to the outside, and there is also a problem that the appearance of the molded product is impaired.

An object of the present invention is to provide a molding die and a molding method for a laminated molded article which can efficiently mold various shapes.

[0006]

A molding die for a laminated molded article according to the present invention is divided into a male die and a female die, and an outer peripheral surface of these male die and an inner peripheral surface of the female die are separated from each other. A molding die for a laminated molded article, which is formed by cutting a surplus portion of a skin surface material that covers the surface of a molded article to be molded by closing while sliding, wherein the edge of the molding surface on the male die side is the It is one of a pair of blades for shearing the skin material, and the edge of the step provided on the inner peripheral surface of the female mold side is the other of the pair of blades for shearing the skin material. Characterize. In the above, as the skin surface material, a surface material having a laminated structure including a thin skin layer and a thick cushion layer having a cushioning property can also be used. Further, it is preferable that the protruding dimension of the step is set according to the thickness dimension of the skin material. Further, on the outer peripheral surface of the male mold, a flange portion of both blades whose both edges are blades is provided, and this flange portion has one edge as a shearing blade of the skin surface material and the other edge. It is preferably a partial stripping blade for partially stripping the skin material, and the thickness dimension of the flange is preferably set according to the amount of the skin material drawn into the female mold during molding. .

A method for molding a laminated molded article according to the present invention is a method for molding a laminated molded article in which molding is performed using a mold according to the present invention, wherein the outer peripheral surface of the male die and the inner peripheral surface of the female die are molded. By sliding and clamping the mold, the skin surface material is sandwiched in the gap between the male mold and the female mold during compression of the mold, and the male mold and the female mold are compressed immediately before the completion of compression of the mold. It is characterized in that the skin material is sheared at both edges of the mold.

In the molding method as described above, the following materials, molding apparatus and molding procedure can be adopted. (1) Material The skin surface material is not particularly limited and may be a single layer or multiple layers, but particularly preferably, woven cloth, non-woven cloth, knitted cloth, vinyl chloride (hereinafter abbreviated as PVC). ) And other thermoplastic elastomer (hereinafter referred to as TPO) and the like, and a skin layer,
Laminated surface material in which a cushion layer made of a foam such as polypropylene and polyurethane is integrated, or a laminated surface material in which a skin layer made of PVC, TPO, etc. and a cushion layer made of woven cloth, non-woven cloth, knitted cloth, etc. are integrated. Etc. can be adopted. Examples of the resin as the base of the molded product include thermoplastic resins such as polypropylene, polystyrene, polyethylene, ABS, and polycarbonate, and those containing a filler such as talc, mica, and glass fiber in these thermoplastic resins. Can be adopted. (2) Molding device As the molding device, an injection compression molding machine, an injection press molding machine, and a hydraulic device that presses the moving die part toward a fixed die part on a moving die plate to which a moving die is attached. A molding machine provided with a pressing mechanism such as can be adopted.

(3) Molding procedure The following procedure can be adopted as the molding procedure. The mold is opened, and in this state, the cushion surface material is mounted on one of the male mold and the female mold. When closing the mold, stop the mold on the moving side at a position that is a predetermined distance from the position where it is completely closed, and prevent the mold on the moving side from retracting from this position and opening the mold.
Block the back of the mold. At this time, by closing the mold, due to the step of the female mold, a gap is formed between the outer peripheral surface of the male mold and the inner peripheral surface of the female mold, and the skin surface material is sandwiched in this gap, If the mold is clamped in this state, an appropriate tension is applied to the skin surface material from the center toward the outer circumference. The resin melted by the injection device is filled in the mold. Immediately before or after the completion of filling, the mold is clamped by applying a compressive force, and the resin inside is spread by the mold clamping to fill the mold. Here, when the mold is completely closed, the skin facing is sheared at both male and female edges. A predetermined compressive force is applied to the resin until the temperature of the molten resin decreases to a predetermined temperature, the resin is cooled and solidified, and then the mold is opened and the molded product is taken out. When the injection is completed, pre-plasticization for the next injection molding is started. When a skin surface material in which a thin skin layer and a thick cushion layer are integrated is used, the compressive force applied to the mold is reduced after the mold is filled with the molten resin. If so, the cushioning property of the surface material will not be impaired.

[0010]

According to the present invention as described above, the pair of blades for shearing the skin surface member are constituted by the edge of the molding surface on the male side of the mold and the edge of the step provided on the inner peripheral surface of the female side. By forming and completely closing the mold, the skin surface material is sheared, so that molding of the laminated molded product and trimming of the skin surface material can be performed at the same time, and the position of the pair of blades is It can be set at any position according to the shape of the product.
Further, when the mold is closed, a gap is formed between the outer peripheral surface of the male mold and the inner peripheral surface of the female mold due to the step provided on the inner peripheral surface on the female mold side. If the size of this gap is set according to the thickness of the skin surface material, the skin surface material is sandwiched between the male mold and the female mold by mold clamping, and the skin surface material is Regardless of the shape, the appropriate tension is applied from the center to the outer peripheral direction, and this tension is maintained from the beginning to the end of the mold clamping. With this tension, trimming can be performed at the same time as molding without causing wrinkles on the skin material, and the male and female edges that can be set at arbitrary positions allow laminated molding of various shapes. It becomes possible to mold articles, which achieve the above objectives. In addition, the outer peripheral surface of the male mold is provided with a double-edged flange part having edges on both sides as a blade, one edge of this flange part is a shearing blade of the surface material, and the other edge is a surface material. With a partial stripping blade that partially strips the back side, etc., if the thickness dimension of the collar portion is set according to the amount of the skin surface material drawn into the female mold during molding, Since the back side of the skin surface material that is drawn into the female mold at the time of molding is stripped off by the edge of the partial stripping blade, a laminated structure consisting of a thin skin layer as the skin surface material and a thick cushion layer having cushioning properties. Even if this is adopted, since the skin layer and the resin layer are directly adhered to each other at the end portion of the molded product, the cushion layer is not exposed to the outside and the molded product can have a good appearance.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a mold 1 of this embodiment.
This mold 1 is a fixed mold part 10 as a male mold on the right side of the drawing.
And a movable mold part 20 as a female mold on the left side. The fixed mold part 10 is a mold which has a molding surface 11 for molding the molten resin and which is immovably fixed to an injection compression molding machine (not shown).
This fixed mold part 10 is provided with a bush 12 against which a nozzle of an injection compression molding machine is abutted, and a sprue 13 for introducing molten resin into the mold 1 is provided at the central part of the fixed mold part 10. It is provided through. Outer peripheral surface of fixed mold part 10
The blade 14 is provided with a double-edged flange portion 15 whose both edges are blades. The surface of the flange portion 15 on the left side in the drawing constitutes a part of the molding surface 11. Among the edges of the collar portion 15, the edge 16 on the left side (the molding surface 11 side) in the drawing is a blade for shearing the skin surface material 30 arranged in the mold 1. On the other hand, the collar 15
In the figure, the edge 18 on the right side (the surface 17 side inclined with respect to the outer peripheral surface 14) is a blade having a wedge-shaped cross section, and the cutting edge thereof faces the opening side of the movable mold portion 20 when the mold is clamped. It is a partial stripping blade that partially strips the back side of the face material 30. Here, the peripheral surface 15A of the collar portion 15 is a part of the outer peripheral surface 14 of the fixed mold portion 10.

The movable mold part 20 is one in which the bottom of the recess of the female mold is the molding surface 21, and is movably provided in the above-mentioned injection compression molding machine. The molding surface 21 forms a cavity 22 together with the molding surface 11 (shown by a chain double-dashed line in the figure) of the fixed mold portion 10 when the mold 1 is closed. Movable mold part 20
A step 24 is provided near the cavity 22 on the inner peripheral surface 23. The edge 25 of the step 24 is a blade for shearing the skin material 30, and together with the edge 16 on the fixed mold part 10 side, constitutes a pair of blades for shearing the skin material 30. A mold clamping device (not shown) is arranged on the left side of the movable mold part 20 in the figure, and when the movable mold part 20 is moved to close the mold 1 by this mold clamping device, the collar of the fixed mold part 10 is closed. A gap 26 is formed between the peripheral surface 15A of the portion 15 and the inner peripheral surface 23 of the movable mold portion 20 (see FIG. 2).

This mold clamping device compresses the movable mold part 20 toward the fixed mold part 10, and the compression force can be continuously adjusted within the range of 0 to 100% of the maximum compression force. It is like this. By driving this mold clamping device,
The molten resin filled in the cavity 22 is spread, and an internal pressure is applied to the molten resin after the spreading is completed. The internal pressure applied to the molten resin presses the resin against the molding surfaces 11 and 21 and maintains the resin in a predetermined shape, which is an indispensable force for obtaining good moldability. The skin surface material 30 is a surface material having a laminated structure including a thin skin layer 31 and a thick cushion layer 32 having a cushioning property.

FIG. 2 shows the flange 15 of the fixed mold 10 and the step 24 of the movable mold 20 in an enlarged manner. In the figure, the distance t1 between the molding surface 21 of the movable mold portion 20, which is the protruding portion of the step 24, and the peripheral surface 15A of the collar portion 15, is the skin surface material.
The size is set so that 30 can be completely sheared and the molten resin does not leak to the gap 26 side between the fixed mold part 10 and the movable mold part 20. Movable mold part which is the lower surface of step 24
The interval dimension t2 of the gap 26 formed between the inner peripheral surface 23 of the 20 and the peripheral surface 15A of the collar portion 15 is set according to the thickness dimension of the skin layer 31 of the skin surface material 30. As a result, when the mold 1 is clamped, the skin surface material 30 is sandwiched between the peripheral surface 15A of the collar portion 15 of the fixed mold portion 10 and the inner peripheral surface 23 of the movable mold portion 20. An appropriate tension is applied to 30 from the center of the molding surface 11 toward the outer peripheral direction. Further, since the skin layer 31 is housed in the gap 26, the skin layer 32 is prevented from being cut unless the edge 25 of the step 24 and the edge 16 of the collar portion 15 intersect. The tension is maintained from the beginning to the end of mold clamping. The thickness dimension t3 of the collar portion 15 is set according to the amount by which the skin surface material 30 is drawn into the movable mold portion 20 during molding. The protruding dimension t4 of the collar portion 15 is set according to the thickness dimension of the skin surface material 30. Thereby, the outer peripheral surface 14 of the fixed mold part 10 and the movable mold part
The skin material 30 is allowed to move smoothly between the inner peripheral surface 23 of 20 and the skin 20 so that the skin material 30 is not cut in the middle when it is drawn into the movable mold part 20.

In this embodiment, injection compression molding is performed by the following procedure. First, after mounting the skin material 30 on the mold 1 with the mold 1 opened, the movable mold part 20 is moved toward the fixed mold part 10 and a predetermined size (for example, The movable mold part 20 is stopped at a front position (about 5 to 100 mm), and the movable mold part 20 is blocked so as to prevent the movable mold part 20 from moving backward from this position and opening the mold. At this time, as shown in FIG. 2, the skin material 30 is moved between the peripheral surface 15A of the collar portion 15 of the fixed mold portion 10 and the inner peripheral surface 23 of the movable mold portion 20 by the forward movement of the movable mold portion 20. Sandwiched. This allows
Appropriate tension can be continuously applied to the skin material 30 from the beginning to the end of the mold clamping.

Next, an injection device (not shown) is driven to fill the inside of the cavity 22 of the mold 1 with the molten resin, and the mold clamping device is driven immediately before or immediately after the completion of the filling process to drive the mold 1 A mold is clamped by applying a compressive force to the molten resin, and the melted resin is spread and filled in the cavity 22 by this mold clamping. Then, by filling and spreading the molten resin in the cavity 22, the skin surface material 30 is drawn into the movable mold part 20 through the gap 26. However, the interval dimension t2 of the gap 26 is set according to the skin layer 31 of the skin material 30, so that the skin material 30 is drawn into the movable mold part 20 and at the same time, The cushion layer 32 is stripped from the skin layer 31 by the edge 18 of the collar 15 as shown in FIG. At this time, since the thickness t3 of the collar portion 15 is set according to the amount of the skin surface material 30 drawn into the movable mold portion 20, when the mold clamping of the mold 1 is completed, the skin surface material Boundary 30 where the peeling of 30 cushion layers 32 has started
As shown in FIG. 4, A stops near the edge 16 of the collar portion 15, and this skin surface material 30 is cut near the boundary portion 30A by the edge 25 of the step 24 and the edge 16 of the collar portion 15. It

Subsequently, the molten resin is used for the cavity 22 of the mold 1.
When all the corners are filled, the compression force applied to the mold 1 is reduced so that the cushion layer 32 is not crushed.
Here, while the compression force is decreasing, the surface of the molten resin may be cooled to such an extent that the cushion layer 32 does not melt significantly, and then the compression force may be increased again. By doing so, the resin is cooled and solidified under a high compression force sufficient to maintain the molten resin in a predetermined shape. When the cooling and solidification of the molten resin is completed, the mold 1 is opened and the molded product is taken out from the inside of the mold 1. FIG. 5 shows a cross section of the molded product 2 taken out from the mold 1. In the figure, the molded product 2 is a laminated molded product in which the skin surface material 30 is attached to the front side (left side in the drawing) of the resin 3. Molded product 2 skin material 30
Is the boundary portion 30A where the peeling of the cushion layer 32 is started.
Since the vicinity of is cut, the edge of the cushion layer 32 is not exposed to the outside, and the cushioning property is given to the entire front side of the molded product 2. Also, by sandwiching it in the gap 26 between the fixed mold part 10 and the movable mold part 20, the skin surface material 30
Since an appropriate tension is applied to the surface of the molded product 2, no defects such as wrinkles occur on the surface of the molded product 2.

According to the above-described embodiment, the following effects can be obtained. That is, a pair of blades for shearing the skin surface material 30 is used as the edge 16 of the molding surface 11 of the mold 1 on the fixed mold part 10 side.
And the edge 25 of the step 24 provided on the inner peripheral surface 23 on the movable mold part 20 side to completely close the mold 1 so that the skin surface material 30 is sheared. Even if the product 2 is a simple plate-shaped product, the molding and trimming of the skin material 30 can be performed at the same time to improve the manufacturing efficiency of the laminated molded product 2, and the positions of the edges 16 and 25 depend on the shape of the molded product. Since it is possible to set it at an arbitrary position, molded articles of various shapes can be molded.

When the mold 1 is closed, the movable mold part 20
Due to the step 24 provided on the inner peripheral surface 23, a gap 26 is formed between the inner peripheral surface 23 and the peripheral surface 15A of the flange portion 15 of the fixed mold portion 10, and the dimension t2 of the gap 26 is defined as the skin. Since the thickness is set according to the thickness of the face material 30, by the mold clamping of the mold 1, an appropriate tension is continuously applied to the skin surface material 30 from the beginning to the end of the mold clamping. There is no problem such as wrinkles, and a molded product 2 having a good appearance can be obtained.

Further, the outer peripheral surface 14 of the fixed mold portion 10 is provided with a double-blade flange portion 15 having edges on both sides as blades.
The edge 18 of this is a partial stripping blade that partially strips the back side of the skin material 30, and the skin material 30 is movable during molding.
Since the thickness dimension t3 of the collar portion 15 is set according to the amount of pulling in, the skin layer 30 is pulled from the skin layer 30 by the edge 18 when the skin layer 30 is drawn into the movable mold section 20.
The boundary area where the peeling started and the peeling started
The shearing position of the skin material 30 is near 30A. As a result, the skin layer 31 is directly adhered to the resin layer of the molded product 2 at the edge of the molded product 2 and the end surface of the cushion layer 32 of the skin surface material 30 is not exposed to the outside. Cushioning properties can be given to the whole and the appearance can be improved. Further, since the compressive force applied to the mold 1 is reduced after the molten resin is filled so that the cushion layer 32 is not significantly damaged, the cushioning property of the molded product 2 is prevented from being lost. it can.

Next, the effects of the present invention will be described based on concrete experimental examples. [Experimental Example 1] The experimental example 1 is an experiment for molding a laminated molded product by using the mold 1 of the above-mentioned embodiment. In this experimental example 1,
The chair back is molded as a molded product. The backrest of this chair is a plate-like member that is attached to a seating portion of the chair through a support or the like, and is curved according to the shape of the back, as shown in FIG. On the front side of the backrest, a skin material having a cushioning property is attached. The width W and height H of the backrest are 400 mm and 250 mm, respectively. The mold 1 of Experimental Example 1 has one gate near the center of the cavity 22,
Molding surface 21 of movable mold part 20, which is the protruding part of step 24
And the distance t1 between the flange 15 and the peripheral surface 15A is set to 0.02 mm, and the distance t2 of the gap 26 is set to 0.4 mm. [Comparative Example 1] In order to confirm the effect of the present invention, Comparative Example 1 is a mold in which the step 24 is omitted from the mold 1 of Experimental Example 1, and the same molded product as in Experimental Example 1 is obtained. It is an experiment to try. In Comparative Example 1, the distance between the inner peripheral surface 23 of the movable mold part 20 and the peripheral surface 15A of the collar part 15 (the size corresponding to the size t2 in the above embodiment) is set to 0.02 mm. . [Comparative Example 2] In order to confirm the effect of the present invention, Comparative Example 2 is a mold in which the step 24 is omitted from the mold 1 of the above-mentioned Example in order to confirm the effect of the present invention. This is an experiment to obtain the same molded product. In Comparative Example 2, the movable mold part
The distance between the inner peripheral surface 23 of 20 and the peripheral surface 15A of the collar portion 15 (the dimension corresponding to the dimension t2 in the above embodiment) is set to 0.4 mm.

[Common Injection Conditions] In Experimental Example 1, Comparative Example 1 and Comparative Example 2, common materials, devices and molding conditions are adopted. These materials and the like are as follows. (1) Material Polypropylene (made by Idemitsu Petrochemical Co., Ltd., trade name: Idemitsu Polypro J-5050, MI: 5) is used as the base resin for molded products.
Use 5g / 10min, 230 ℃, 2.16kgf). Further, as the skin surface material, a laminated sheet material having a thickness of 15.8 mm in which a skin layer having a thickness of 0.8 mm made of PVC and a cushion layer having a thickness of 15 mm obtained by foaming polypropylene are integrated is adopted. (2) Molding device As a molding device, a general-purpose horizontal injection molding machine is combined with an injection compression molding mechanism.
t manufactured by Mitsubishi Heavy Industries) is used. This injection compression molding machine can continuously adjust the compression force between 0 and 100% of the maximum compression force. (3) Molding conditions Molding temperature; 180 ℃ Mold temperature; 40 ℃ Resin injection time; 2.2 seconds Resin injection pressure; 100 kg / cm ² (gauge pressure) Resin cooling time; 40 seconds Mold compression amount; 30mm Clamping start timing; 2.0 seconds after injection starts Mold compression speed; 10mm / sec Compression force during mold clamping; 120t

[Experimental Results] In Experimental Example 1, no crushing or wrinkling occurred on the surface of the skin surface material of the molded product, and the skin layer of the skin surface material directly adhered to the resin at the edge portion of the molded product. A laminated molded article was obtained which was adhered, the cushion layer was not exposed, and the appearance was good. On the other hand, in Comparative Example 1, when the mold is closed, the inner edge of the opening of the movable mold part 20 and the outer edge 16 of the molding surface 11 of the fixed mold part 10 intersect and melt. The skin facing was sheared prior to resin filling and mold clamping.
Due to the shearing of the skin surface material, the skin surface material inside the mold is
No tension can be applied. For this reason, when the molten resin is filled and spread, it is pushed by the molten resin and the surface material inside the mold shifts, causing wrinkles on the surface of the obtained molded product and the cushion layer of the surface material. It can be seen that it is exposed to the outside and the appearance is impaired by these wrinkles and cushion layers, and in Comparative Example 1, a laminated molded article having a good appearance cannot be obtained. On the other hand, in Comparative Example 2, even if the mold was completely closed, the skin material could not be sheared. Therefore, post-processing such as trimming work after molding and work for folding back edges of the skin material was required. . Moreover, the inner peripheral surface 23 of the movable mold part 20 and the collar part
Since the molten resin has entered between the peripheral surface 15A of 15 and the peripheral surface 15A, burrs are generated on the edges of the molded product, and the work for removing the burrs is required. Therefore, in Comparative Example 2, it is not possible to improve the manufacturing efficiency of the laminated molded product.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. It is possible. For example, the skin layer of the skin surface material is not limited to PVC, but may be other TPO, and the cushion layer is not limited to polypropylene foam, but foam such as polyurethane, and woven cloth, non-woven cloth, and Thick cloth such as knitted cloth may be used. Further, as the skin surface material, as shown in FIG. 7, a relatively thin skin surface material 33 which is not laminated may be used. In this case, the fixed mold part 10 which is a male mold is used. The part 15 may be omitted. Even with such a fixed mold part 10, the edge of the molding surface 11
Since the 16 shears the skin surface material 33 in cooperation with the edge 25 of the movable mold part 20, it is possible to mold a flat laminated product and improve its appearance, and it is possible to eliminate the work such as trimming. .

In the case of molding a molded product having a side wall which is bent in an L shape along the outer peripheral edge thereof, as shown in FIG. 8, a movable mold which is a female mold. The edge 28 of the protrusion 27 protruding from the inner surface 23 of the portion 20
May be a blade forming a pair with the edge 16 of the fixed mold part 10. At this time, if the protrusion 27 can be projected and retracted on the inner side surface 23, the molded product that has been molded in the mold can be easily taken out from the movable mold part 20.

Further, the resin that forms the base of the molded article is not limited to polypropylene containing no reinforcing fibers, but may be polypropylene containing a filler such as talc or mica or a filler such as glass fiber, or polyethylene, Other synthetic resins such as polystyrene, ABS and polycarbonate, and fiber reinforced resins thereof can also be adopted.

The molding apparatus is not limited to the injection compression molding machine, and may be an injection press molding machine or the like, in short, as long as it can spread the molten resin filled in the mold by clamping. Further, the molded product is not limited to a chair back, but may be a furniture component such as a sofa, an automobile interior product, or an electric product casing. Furthermore, the molding conditions such as the set value of the compressive force and the start time of each step are not limited to those shown in Experimental Example 1, and various values can be selected according to the size of the molded product, the type of resin, and the like. The specific numerical value may be set appropriately in the implementation.

[0028]

As described above, according to the present invention, it is possible to efficiently form laminated molded articles having various shapes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mold according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the mold of the embodiment.

FIG. 3 is an enlarged cross-sectional view showing a mold clamped state of the mold of the embodiment.

FIG. 4 is an enlarged cross-sectional view showing a mold clamping state different from that of FIG. 3 of the mold of the embodiment.

FIG. 5 is a cross-sectional view of an edge of the laminated molded article of the example.

FIG. 6 is a perspective view showing an entire molded product molded in Experimental Example 1 according to the present invention.

FIG. 7 is a diagram corresponding to FIG. 1 showing a modified example of the present invention.

FIG. 8 is a diagram corresponding to FIG. 1 showing a different modification of the present invention.

[Explanation of symbols]

 1 Mold 2 Laminated molded product 10 Fixed mold part as male mold 11 Molding surface on male side 15 Collar part 15A Peripheral surface as outer peripheral surface of male mold 16 Edge as male blade 18 As partial stripping blade Edge 20 of movable mold part 23 as female mold 23 female inner surface 24 step 25, 28 edge of female mold 27 protrusion forming step 33, 33 skin material 31 skin material skin layer 32 Cushion layer of skin material

Claims (7)

[Claims] 1. A surface of a molded article to be molded is divided into a male mold and a female mold, and the outer peripheral surface of the male mold and the inner peripheral surface of the female mold are closed while sliding. A molding die for a laminated molded article for cutting an excess portion of a covering skin material, wherein an edge of a molding surface on the male mold side is one of a pair of blades shearing the covering skin material, and, A molding die for a laminated molded article, wherein an edge of a step provided on the inner peripheral surface on the female die side is the other of the pair of blades for shearing the skin surface material. 2. The molding die for a laminated molded article according to claim 1, wherein the skin surface material has a laminated structure composed of a thin skin layer and a thick cushion layer having cushioning properties. A mold for molding a laminated molded article, characterized in that 3. The molding die for a laminated molded article according to claim 2, wherein the protruding dimension of the step is set according to the thickness dimension of the skin surface material. Mold for molding molded products. 4. The molding die for a laminated molded product according to claim 2 or 3, wherein a double-edged flange portion having edges on both sides is provided on the outer peripheral surface of the male die, This flange portion, one edge is a shearing blade of the skin material, the other edge is a partial stripping blade for partially stripping the skin material, the thickness dimension of the collar, during molding A molding die for a laminated molded article, wherein the skin surface material is set according to an amount to be drawn into the female die. 5. A laminate for integrally molding a laminated molded product in which the skin surface material and the resin are laminated by filling a molten resin inside a mold in which the skin surface material is arranged in advance. A method of manufacturing a molded article, wherein the mold is divided into a male mold and a female mold, and an edge of a molding surface on the male mold side is one of a pair of blades that shears the skin surface material, The edge of the step provided on the inner peripheral surface of the female mold side is the other of the pair of blades for shearing the skin surface material,
And, using a mold in which a gap is formed between the outer peripheral surface of the male mold and the inner peripheral surface of the female mold, while sliding the outer peripheral surface of these male mold and the inner peripheral surface of the female mold By clamping the mold, the skin surface material is sandwiched in the gap between the male mold and the female mold when the mold is compressed, and the edges of both the male mold side and the female mold are immediately before the completion of compression of the mold. A method for forming a laminated molded article, which comprises shearing the skin surface material according to. 6. The method for manufacturing a laminated molded article according to claim 5, wherein the skin surface material is a surface material having a laminated structure including a thin skin layer and a thick cushion layer having cushioning properties. The mold has a double-edged flange portion whose both edges are blades on the outer peripheral surface of the male die, and this flange portion has one edge serving as a shearing blade of the skin surface material and the other edge. Is a partial stripping blade for partially stripping the skin surface material, the thickness dimension of the flange is set according to the amount of the skin surface material drawn into the female mold during molding, the molten resin Of a laminated molded article, characterized in that the cushion layer is peeled off from the skin layer of the skin surface material that is pulled into the female mold by the partial stripping blade of the collar portion during filling of the mold and compression of the mold. Method. 7. The laminated molding according to claim 5, wherein the compressive force applied to the mold is reduced after the molten resin is filled in the mold. Molding method.