JPH08156019A - Manufacture of multi-layer molding - Google Patents

Abstract

PURPOSE: To provide a method of manufacturing a multi-layer molding with an excellent surface condition free from an unevenness in a short molding cycle and at a low cost. CONSTITUTION: A skin material 26 is set in a molding cavity 18 using a die composed of the molding cavity 18 of such a shape as to match an intended multi-layer molding and a resin introduction space 20 with a specified resin inflow orifice 22 which are connected to each other in an almost same width. On the other hand, a molten resin material to serve as a base material 38 is injected into the resin introduction space 20 from the resin inflow orifice 22 of the resin introduction space 20, so that the molten resin material is poured forward, while it is being charged fully into the resin introduction space 20. Further, the molten resin material is poured into the molding cavity 18, and after that, is solidified by cooling. Thus, it is possible to mold the base material 38 integrally with the skin material 26 into a laminate form.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a multi-layer molded article in which a skin material is integrally laminated on an outer surface of a base material made of a predetermined resin material, and is particularly excellent in terms of no unevenness. The present invention relates to a method capable of advantageously producing a multi-layer molded product having a different surface condition.

[0002]

2. Description of the Related Art Conventionally, vehicle interior parts and the like are formed of a multi-layer molded article in which a skin material is integrally laminated on the outer surface of a base material made of a predetermined resin material. For example, in an automobile instrument panel or the like, generally, a skin material made of a polyvinyl chloride skin layer and a foamed polyurethane foam layer has a base material made of a resin material such as polypropylene on the foamed layer side. It is configured by being integrally laminated on one surface.

By the way, when producing a multi-layer molded article having such a structure, the following two methods are mainly adopted. That is, in one method shown in FIG. 10, first, as shown in (a), a base material 38 having a predetermined shape is formed by injection molding or the like, and then, as shown in (b). As described above, the adhesive is applied to the outer peripheral surface of the base material 38 to form the adhesive layer 50. After that, as shown in (c), the adhesive layer 5
0 is covered with a skin material 26 composed of, for example, a skin layer 28 and a foam layer 30, and a base material 38 and the skin material 26 are adhered to each other, thereby obtaining a desired multi-layer molded article. In addition,
When adhering the skin material 26 to the base material 38, the skin material 2
6 is pre-shaped and formed into a shape corresponding to the base material 38, and then adhered to the base material 38, and by vacuum forming.
In some cases, the skin material 26 may be brought into close contact with the base material 38, and at the same time, may be attached.

Further, in another method clarified in FIG. 11, first, as shown in (a), a mold 52 having a molding cavity 18 having a shape corresponding to an intended multi-layer molded product is used, While the skin material 26 is set in advance in the molding cavity 18 of the mold 52, the molten resin material 36, which is heated and melted and gives the base material, is sprued in the pot portion 54 opening to the molding cavity 18. Inject through bush 56. Next, as shown in (b), the sprue bush 56 is pushed up, and the molten resin material 36 stored in the pot portion 54 is pushed by the tip portion thereof.
To flow into the molding cavity 18. Then, as shown in (c), the molten resin material 36 is cooled and solidified by pressing at a predetermined pressure to thereby form a base material 38 and the base material 38 to the skin material. 26 is integrally laminated to obtain a desired multi-layer molded product.

As described above, conventionally, when a multi-layer molded article is produced, the base material 38 and the skin material 26 are adhered and integrated by an adhesive, so-called skin material laminating molding,
A molding method such as compression molding in which the base material 38 is molded using a predetermined mold 52 and is integrated with the skin material 26 at the same time is adopted.

However, the above-described skin material laminating molding method requires a bonding step for integrating the base material 38 and the skin material 26 in addition to the molding step for the base material 38 and the skin material 26. There is a problem that the manufacturing cost becomes high because the adhesive is used in such a process inevitably becoming long, and in addition, there is a possibility that peeling may occur due to defective adhesion. There was also.

On the other hand, in the compression molding method, the skin material 26 preset in the molding cavity 18 is prevented as much as possible from being attacked by the contact with the high temperature molten resin material 36 which provides the base material. Therefore, as described above, the molten resin material 36 is once housed in the pot portion 54, the surface temperature of the molten resin material 36 is lowered there, and a skin layer is formed on the surface thereof. Material 36
Is pushed into the molding cavity 18 as the sprue bush 56 is pushed up. Therefore, a part of the molten resin material 36 is cooled around the opening of the pot portion 54 to the molding cavity 18. It solidifies and remains, thereby narrowing the peripheral portion of the opening of the pot portion 54 in the molding cavity 18, and thus the molding cavity 1
At the time of injecting the molten resin material 36 into the inside 8, the resin pressure exerted on the skin material 26 located in the peripheral portion of the opening may be increased. In such a case, the foam layer is crushed especially when the multi-layer molded article in which the skin material 26 has a two-layer structure of the skin layer and the foam layer, such as the instrument panel described above, is produced. As a result, the resulting multi-layer molded article has a problem that irregularities are generated on the surface.

[0008]

The present invention has been completed in view of the circumstances as described above, and the problem to be solved is to provide a multi-layer molded product having no unevenness and an excellent surface condition. The object of the present invention is to provide a method that can be manufactured at a low cost with a short molding cycle.

[0009]

According to the present invention, in order to solve such a problem, a multi-layer molded article in which a skin material is integrally laminated on an outer surface of a base material made of a predetermined resin material is manufactured. In this case, a molding cavity having a shape corresponding to the multilayer molded article and a resin introducing space having a predetermined resin inlet are provided, and the molding cavity and the resin introducing space are connected to each other with substantially the same width. While using the configured mold to set the skin material in the molding cavity, heat and melt the predetermined resin material,
Further, the molten resin material is injected into the resin introducing space from the resin inflow port of the resin introducing space to flow while being filled in the resin introducing space, and then flow into the molding cavity, and then cooled and solidified. By doing so, the base material is integrally laminated and formed on the skin material.

According to the first preferred embodiment of the method for producing a multi-layer molded article according to the present invention as described above, the skin material is composed of a skin layer and a foam layer, and the foam layer is provided on the side of the foam layer. The base material is integrally laminated and molded.

According to a desirable second aspect of the method of the present invention, after the skin material is set across the molding cavity and the resin introducing space, the molten resin material is introduced into the resin. The resin is introduced from the resin inlet of the space into the resin introducing space so that the resin introducing space is filled with the resin introducing space and the resin is introduced into the resin introducing space to flow along the skin material. And then solidified by cooling to solidify the base material integrally with the skin material in the resin introducing space and the molding cavity, and then, in the resin introducing space. A method is adopted in which the integrally formed portion of the skin material and the base material formed in step 1 is cut off.

Further, according to an advantageous third aspect of the method of the present invention, in the mold, the resin introducing space is gradually widened from the forming portion of the resin inflow port toward the molding cavity side. A mold configured as described above will be used.

Further, according to a fourth preferred aspect of the method of the present invention, the multilayer molded article is integrally laminated with the skin material and the base material, and extends integrally from the base material. , A single-layer molding part made of only the predetermined resin material, and the single-layer molding part is formed in the resin introducing space.

[0014]

In summary, in the method for producing a multi-layer molded product according to the present invention, first, in a predetermined die, a skin material is placed in a molding cavity having a shape corresponding to the intended multi-layer molded product. A resin material that is set and then melted by heating through the resin inlet into a resin introduction space that has a predetermined resin inlet and is connected to the molding cavity with substantially the same width. Is poured into the molding cavity so that the resin introduction space is made to flow while flowing into the molding cavity, and then the resin material is cooled and solidified. Are integrally laminated, the resin material in a heated and melted state is allowed to flow in the resin introduction space, so that the resin wall in the mold and the atmosphere forming the resin introduction space are formed. By contact with the surface temperature, the surface temperature can be lowered, and a skin layer having a relatively low temperature can be formed on the surface, and the flowing direction of the molten resin material at the time of flowing from the resin introduction space into the molding cavity. Is substantially constant, and as a result, the resin pressure exerted on the skin material preset in the molding cavity along with the flow of the molten resin material is partially different depending on the flow direction of the molten resin material. This can be advantageously prevented.

Moreover, in the method of the present invention, after the molten resin material that provides the base material is injected into the resin introducing space,
Unlike the conventional method, a part of the molten resin material is cooled and solidified by the resin being made to flow into the molding cavity immediately without any delay and to flow into the molding cavity. It is possible to effectively avoid such things as remaining in the introduction space or the molding cavity,
As a result, it is possible to advantageously prevent a portion of the molding cavity from being narrowed by the residual resin material, and the resin pressure being increased in the narrowed portion.

Therefore, in the method of the present invention, a substantially constant resin pressure is exerted on the entire skin material preset in the molding cavity during the flow of the molten resin material which provides the base material. By doing so, it is possible to effectively prevent the skin material from being partially damaged by the resin pressure of the molten resin material, and to form on the surface of the molten resin material. Due to the presence of the formed skin layer, it can be suppressed as much as possible that the skin material is corroded by the heat at the time of contact with the molten resin material, and as a result, particularly the skin material is the skin layer and the foam layer. It is possible to extremely effectively prevent the foamed layer from being crushed or melted in the case of being constituted by In addition, in addition to this, in the method of the present invention, it is possible to integrally laminate the base material with the skin material without passing through a bonding step using an adhesive or the like.

Therefore, according to the method for producing a multi-layer molded product according to the present invention, a multi-layer molded product having an excellent surface condition without unevenness can be produced in a short molding cycle and at low cost. In such a multi-layer molded article, peeling between the skin material and the base material can be advantageously prevented.

When the structure according to the first aspect of the present invention described above is adopted, a multi-layer molded product having a rich cushioning property and an excellent soft feeling can be advantageously manufactured.

When the structure according to the second aspect of the present invention is employed, the base material is set in the resin introducing space in the skin material, and is integrally laminated on the base material, and then the base material is formed. The heat and the resin pressure of the molten resin material can be intensively applied to the portion to be cut together with it, which causes the damage to the skin material constituting the target molded article. This can be more effectively prevented, and a multi-layer molded article having a better surface condition can be advantageously obtained.

Further, in the case of adopting the configuration according to the third aspect of the present invention, the molten resin material is satisfactorily flown toward the molding cavity in a state where the molten resin material is spread in the width direction of the resin introduction space. Therefore, even when flowing into the molding cavity, the resin can be stably flowed in a certain direction, whereby the resin pressure exerted on the skin material set in the molding cavity is further improved. It can be stably stabilized, and thus the damage to the skin material due to such resin pressure can be prevented more advantageously. Moreover, when the resin material that has been cooled and solidified in the resin introduction space is cut off after the completion of all molding steps, the amount of useless resin material that does not form the target multi-layer molded product is used. However, there is also an advantage that it can be advantageously saved and excellent economic efficiency can be exhibited.

Further, in the case where the structure according to the fourth aspect of the present invention is adopted, a part thereof has a multi-layered structure in which the skin material is integrally laminated on the base material, and the remaining part is formed. It is possible to manufacture a molded product whose part has a single-layer form composed of only a base material in a short molding cycle and at low cost, and has a multi-layer form, and the surface of the part is excellent without unevenness. It can be configured with a different state.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described in detail below with reference to the drawings in order to clarify the present invention more specifically.

First, FIGS. 1 and 2 schematically show an example of an injection-molding die 10 that is preferably used when manufacturing a multilayer molded article according to the present invention. And
As is clear from these figures, the injection molding die 10
Is a first fixed mold 12, a second fixed mold 14, and a movable mold 16.
It consists of and.

Further, in this injection molding die 10, in the closed state, between the first and second fixed molds 12 and 14 and the movable mold 16, the desired multi-layer is formed. Molding cavity 18 having a shape corresponding to the molded product
However, between the first fixed mold 12 and the movable mold 16, the resin introducing space 2 is gradually widened as it goes upward.
0 is formed respectively. And
The molding cavity 18 and the resin introducing space 20 are connected to each other with the same width.
Through the resin inflow port 22 provided on the side opposite to the molding cavity 18, and is communicated with the inner hole of the sprue bush 24 attached to the nozzle of the injection device (not shown) attached to the first fixed mold 12. ing.

Thus, in the injection molding die 10, the molten resin material injected from the injection device (not shown) is injected into the resin introducing space 20 through the sprue bush 24 and the resin inflow port 22, and the resin introducing space is introduced. 20
The inside is made to flow and is made to flow into the molding cavity 18.

Then, the injection molding die 10 having such a structure is used, and the desired multi-layer molded article 26 is preferably manufactured as shown in FIGS. 3 to 7. That will be the case.

That is, first, as shown in FIG.
In a state where the injection molding die 10 is opened, the skin material 26 is arranged on the parting line formed by combining the first fixed die 12 and the second fixed die 14. More specifically, the skin material 26 has a skin layer 28 made of polyvinyl chloride and a foam layer 30 made of foamed polyurethane integrally laminated, and the upper side thereof corresponds to the intended multi-layer molded product. A resin injection space arrangement portion 34 having a shape and a shape corresponding to the resin introduction space 20 formed when the injection molding die 10 is closed.
It has been. Then, such a skin material 26 is arranged on the side of the foam layer 30 so as to face the first fixed mold 12 and at a predetermined interval.

Next, as shown in FIG. 4, the injection molding die 10 is closed, and the molding cavity 18 and the resin are introduced between the first fixed die 12, the second fixed die 14 and the movable die 16. The space 20 is formed. At that time, the molding cavity disposing portion 32 is provided in the molding cavity 18, and the resin introducing space disposing portion 34 is provided in the resin introducing space 20.
The skin material 26 is set so as to straddle the molding cavity 18 and the resin introducing space 20 so that they can be respectively arranged. In addition, in such a skin material 26,
Under such an arrangement state, the skin layer 28 has the movable mold 1
While being brought into contact with the position 6, the predetermined gap is formed between the foam layer 30 and the first fixed mold 12.

Thereafter, as shown in FIG. 5, a molten resin material 36 made of polypropylene or the like that is heated and melted by an injection device (not shown) is introduced from the sprue bush 24 through the resin inlet 22 into the resin of the skin material 26. The resin is injected into the resin introducing space 20 toward the space arranging portion 34. Then, the molten resin material 36 is filled in the resin introducing space 20 in the resin introducing space 20 in the width direction thereof, and is filled with the molten resin material 36 toward the molding cavity 18 toward the molding cavity 18. The molding cavity 1 is made to flow by flowing over the surface of the foam layer 30 in the arrangement portion 34.
Let it flow into 8. In addition, such a molten resin material 3
At the time of flow of No. 6, as is clear from FIG. 5, a part of the foam layer 30 in the resin introduction space arrangement portion 34 of the skin material 26 is melted by the heat and the resin pressure that it has,
Or it will be crushed.

Next, as shown in FIG. 6, after the molten resin material 36 is filled in the resin introducing space 20 and the molding cavity 18, it is cooled and solidified, whereby the resin introducing space 20 and the molding cavity are solidified. The base material 38 is integrally laminated on the skin material 26 in and inside 18. At that time, by contact with the molten resin material 36,
As a result, unevenness is generated on the surface of the resin introduction space arrangement portion 34 of the skin material 26 in which a part of the foam layer 30 is melted or crushed.

Then, as shown in FIG.
After the integrally molded product of the skin material 26 and the base material 38 obtained as described above is taken out from the molding cavity 18 of the injection molding die 10 and the resin introduction space 20, the resin introduction space of the skin material 26. The arrangement portion 34 is cut off together with a part of the base material 38 that is integrally laminated and molded with respect to such a part. Thus, the intended multi-layer molded product 42 in which the skin material 26 is integrally laminated on the outer surface of the base material 38 is obtained.

Thus, in this embodiment, the base material 3
When the molten resin material 36 that gives 8 is injected into the resin introducing space 20, the foamed layer of the resin introducing space arranging portion 34 of the skin material 26 that is arranged in the resin introducing space 20 and is finally cut off. 30 to the molten resin material 36
The heat and the resin pressure of the molding material cause the melting and crushing of the molding material in a concentrated manner, so that the molding cavity arranging portion 32 of the skin material 26 arranged in the molding cavity 18 is It is possible to effectively prevent the damage caused by the heat and the resin pressure.

Further, since the resin introducing space 20 is configured so as to gradually widen toward the molding cavity 18 and to be connected to the molding cavity 18 with the same width, the molten resin material 36 becomes the resin introducing space 20. The inside can be made to flow uniformly toward the molding cavity 18 in a state of being spread in the width direction,
Even when it flows into the molding cavity 18, it can be stably flowed in a certain direction, whereby the resin pressure exerted on the molding cavity placement portion 32 of the skin material 26 can be well stabilized, and Mold cavity placement part 3
Damage to 2 can be further reduced.

Further, in this embodiment, since the molten resin material 36 can be continuously injected into the resin introducing space 20 and the molding cavity 18 through the sprue bush 24 by the injection device, A part of the molten resin material 36 is cooled and solidified in the resin introduction space 20 and the molding cavity 18 when flowing,
It is possible to advantageously avoid that the resin introduction space 20 and the molding cavity 18 are narrowed and the resin pressure is partially increased due to the narrowed space.

Therefore, as a result, in the present embodiment, it is possible to manufacture the multi-layer molded product 42 having an excellent surface condition without unevenness.

Moreover, in this embodiment, the skin material 26
On the other hand, when the base material 38 is integrally laminated and molded, an injection molding method is adopted, and therefore, compared with a case where a conventional skin material sticking molding method is adopted, a target multi-layer molded product is obtained. 42 can be manufactured in a short molding cycle at low cost, and further, peeling between the skin material 26 and the base material 38 can be advantageously prevented.

By the way, in the above embodiment, the skin material 26 is disposed so as to straddle the molding cavity 18 and the resin introducing space 20, and the molten resin material for providing the base material 38 on one surface of the skin material 26. The base material 38 is integrally laminated on the skin material 26 by injecting 36, and then the skin material 2 formed in the resin introducing space 20.
6 of the resin introduction space arrangement portion 34 and the base material 38 is cut away to form only the integrally formed portion of the molding cavity arrangement portion 32 of the skin material 26 and the base material 38 formed in the molding cavity 18. Was intended to be configured as the intended multi-layer molded product 42. However, by disposing the skin material only in the molding cavity, the base material is integrated with the skin material in the molding cavity. On the other hand, the base material is formed into a predetermined shape in the resin introduction space while being laminated, whereby a part of the base material has a multi-layered structure including a skin material and a base material, and the remaining part includes only the base material. You may make it form the multi-layer molded article comprised by the single layer form.

Specifically, as is clear from FIG.
The injection-molding die 43 used here has a structure in which a desired multi-layer molded article is molded between the first fixed die 12, the second fixed die 14 and the movable die 16 in a closed state. A resin having a molding cavity 18 having a shape corresponding to a portion having a layered shape, and a resin having a shape corresponding to a portion configured to have a single layer between the first fixed die 12 and the movable die 16. The introduction spaces 20 are each formed. And those molding cavities 18
The resin introduction space 20 is connected to the resin introduction space 20 with the same width, and the resin introduction space 20 is connected to the nozzle of the injection device (not shown) attached to the first fixed die 12 through the resin inlet 22. It communicates with the inner hole of 24.

Then, in order to manufacture an intended multi-layer molded article using the injection molding die 43 having such a structure, first, as in the above-mentioned embodiment, the molding cavity 18 is first prepared.
After the skin material 26 is set inside, the molten resin material 36 heated and melted by the injection device is supplied from the sprue bush 24 to the resin inlet 22 of the resin introducing space 20.
Through the resin injection space 20. Next, the molten resin material 36 is caused to flow while being filled in the resin introduction space 20, and then is made to flow into the molding cavity 18. Then, the molten resin material 36 is filled in the molding cavity 18 and cooled and solidified.

Thus, as shown in FIG. 9, in the molding cavity 18, an integral laminated molding portion 46 in which the base material 38 is integrally laminated on the skin material 26 is formed, and the resin introducing space is formed. Within 20, the substrate 38
A single-layer molded part 48 is formed by molding into a predetermined shape, and a multi-layer molded product 44 configured as an integrally molded product of the integrally laminated molded part 46 and the single-layer molded part 48 is formed. , Is created.

As described above, in the present embodiment as well, the molten resin material 36 which provides the base material 38 is
The resin introducing space 20 is filled with the resin introducing space 20, flows in the resin introducing space 20, and further flows into the molding cavity 18 having the same width as the resin introducing space 20. When the flow of
Since the surface temperature of the molten resin material 36 is lowered, a skin layer having a relatively low temperature can be formed on the surface thereof, and the resin introduction space 20 of the molten resin material 36 can be formed.
When the molten resin material 36 flows into the molding cavity 18 from the inside, the flowing direction of the molten resin material 36 becomes substantially constant, whereby the heat of the molten resin material 36 and the resin can be applied to the skin material 26 set in the molding cavity 18. The adverse effects of pressure can be prevented as much as possible. Moreover, in this embodiment, since the injection molding method is adopted, the base material 38 is integrally laminated on the skin material 26 in the molding cavity 18 without using any adhesive or the like. At the same time, the base material 38 can be molded into a predetermined shape in the resin introducing space 20.

Therefore, according to this embodiment, a part of the base material 38 has a multilayer structure in which the base material 38 is integrally laminated on the skin material 26, and the rest of the base material 38 is formed.
Multi-layer molded product 4 having a single-layer structure consisting of
4 can be advantageously manufactured with an excellent surface condition without unevenness, with a small number of molding steps, and with excellent economical efficiency.

The two embodiments of the present invention have been described in detail above, but these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, in the first embodiment, the resin introducing space 20 is configured so as to gradually widen toward the molding cavity 18, and in the second embodiment, the resin introducing space 20 is Although it was configured with a predetermined shape to give a single-layer molded product consisting only of the base material 38,
The shape of such a resin introduction space is not limited to these as long as it is connected with the molding cavity with substantially the same width. Furthermore, it goes without saying that the shape of the molding cavity is by no means limited to the one as in the above embodiment.

In the above embodiment, the multi-layer molded products 42, 44 are manufactured by using the injection molding method using the injection molding dies 10, 43 having the resin introducing space 20 and the molding cavity 18. Although it was supposed to be molded, using a molding die having the above-mentioned structure, the molten resin material is injected into the resin introduction space and allowed to flow while filling the resin introduction space, and further inside the molding cavity. Let it flow into
As long as the base material is integrally laminated on the skin material by cooling and solidifying, the molding method is not particularly limited, for example, compression molding methods such as transfer molding, It can be advantageously used.

Further, in the above embodiment, the skin material 26 is
Although it is composed of the skin layer 28 and the foam layer 30, it does not matter if the skin material is composed of only the skin layer.

In addition, it goes without saying that the materials for providing the skin material and the base material are not limited to those in the above embodiment.

Although not listed one by one, the present invention
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included within the scope of the present invention, without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional explanatory view of an essential part showing an example of a mold used for producing a multi-layer molded product according to the method of the present invention.

FIG. 2 is an explanatory view (partially cutaway) as viewed in the direction of arrow A in FIG.

FIG. 3 is an explanatory view showing one step in the method for producing a multi-layer molded product according to the present invention, showing a state in which a skin material is arranged in a state where the mold shown in FIG. 1 is opened. .

FIG. 4 is an explanatory view showing another step in the method for producing a multi-layer molded product according to the present invention, in which the skin material is placed in the molding cavity and the resin introducing space when the mold shown in FIG. 1 is closed. Shows a state in which is set.

FIG. 5 is an explanatory view showing still another step in the method for producing a multilayer molded article according to the present invention, showing a state of injecting a molten resin material for providing a base material into a molding cavity and a resin introduction space. There is.

FIG. 6 is an explanatory view showing still another step in the method for producing a multilayer molded article according to the present invention, showing a state in which the molten resin material injected into the molding cavity and the resin introduction space is cooled and solidified. Shows.

FIG. 7 is an explanatory view showing still another step in the method for producing a multi-layer molded product according to the present invention, wherein an integrally molded product molded by cooling and solidifying a molten resin material is taken out from a mold,
The process of obtaining a desired multilayer molded article by cutting a part thereof is shown.

FIG. 8 is a view corresponding to FIG. 1, showing another example of a mold used when manufacturing a multilayer molded article according to the method of the present invention.

9 is an explanatory diagram showing one step in the method for producing a multilayer molded article according to the present invention using the mold shown in FIG. 8, and is a diagram corresponding to FIG. 6. FIG.

FIG. 10 is a process explanatory view showing an example of a conventional method for producing a multi-layer molded product.

FIG. 11 is a process explanatory view showing another conventional method for producing a multilayer molded article.

[Explanation of symbols]

10, 43 Injection-molding die 18 Molding cavity 20 Resin introduction space 22 Resin inflow port 24 Sprue bush 26 Skin agent 28 Skin layer 30 Foam layer 36 Molten resin material 38 Base material 42 Multi-layer molded product

Claims (5)

[Claims] 1. When manufacturing a multi-layer molded article in which a skin material is integrally laminated on the outer surface of a base material made of a predetermined resin material, a molding cavity having a shape corresponding to the multi-layer molded article. And a resin introducing space having a predetermined resin inflow port, and using a mold configured such that the molding cavity and the resin introducing space are connected with substantially the same width, and the skin material is provided in the molding cavity. While setting the above, the predetermined resin material is heated and melted, and further the molten resin material is injected into the resin introduction space from the resin inflow port of the resin introduction space, and flows while filling the resin introduction space. At least, the base material is integrally laminated on the skin material by allowing the base material to flow into the molding cavity and then cooling and solidifying. Method for producing a multi-layer molded article. 2. The method for producing a multi-layer molded article according to claim 1, wherein the skin material is composed of a skin layer and a foam layer, and the base material is integrally laminated on the foam layer side. . 3. The skin material is set so as to straddle the molding cavity and the resin introducing space, and then the molten resin material is injected into the resin introducing space from a resin inflow port of the resin introducing space. Then, while filling the resin introduction space, it is made to flow along the skin material arranged in the resin introduction space, caused to flow into the molding cavity, and then cooled and solidified. In the resin introduction space and the molding cavity, the base material is integrally laminated on the skin material, and then,
The method for producing a multilayer molded article according to claim 1 or 2, wherein an integrally molded part of the skin material and the base material formed in the resin introducing space is cut off. 4. The resin introduction space as the mold,
The multi-layer molded article according to any one of claims 1 to 3, wherein a mold configured to be gradually widened from a portion where the resin inlet is formed toward the molding cavity is used. Production method. 5. The multi-layer molded article comprises an integrally laminated molding site of the skin material and the base material, and a single-layer molding site integrally extending from the base material and made of only the predetermined resin material. 5. The single layer molding portion is formed in the resin introducing space, and the single layer molding portion is formed in the resin introducing space.
The method for producing a multi-layer molded article according to.